Main process exited, code=exited, status=242/NUMA_POLICY

[caipiblack]

Hello,

Description of the issue

I'm creating this issue, because if we start otbr-agent without any ethernet or wifi interface connected, then when we connect the ethernet cable in the interface, otbr-agent switch to ethernet interface, but it seems to be stopped with error code 242.

We just would like to know if it is a normal situation or a bug ?

How we start otbr-agent

We start ot-br-agent like this:

/usr/sbin/otbr-agent -I "wpan0" -B "mlan0" -B "ethernet" "spinel+cpc://cpcd_0?iid=2&iid-list=0"

We have multiple backbone interface and for the tests they are disconnected on startup and connected at some point.

Some logs

Logs that appear when the ethernet cable is connected:

Aug 21 10:06:34 - kernel: ravb 11c20000.ethernet ethernet: Link is Up - 1Gbps/Full - flow control rx/tx
Aug 21 10:06:34 - kernel: IPv6: ADDRCONF(NETDEV_CHANGE): ethernet: link becomes ready
Aug 21 10:06:34 - otbr-agent[623]: [INFO]-ILS-----: Infra link name ethernet index 3 state changed: UP -> UP+RUNNING
Aug 21 10:06:34 - otbr-agent[623]: [INFO]-ILS-----: Evaluating infra link among 2 netifs:
Aug 21 10:06:34 - otbr-agent[623]: [INFO]-ILS-----:         Infra link mlan0 is in state UP
Aug 21 10:06:34 - otbr-agent[623]: [INFO]-ILS-----:         Infra link ethernet is in state UP+RUNNING
Aug 21 10:06:34 - otbr-agent[623]: [WARN]-ILS-----: Infra link switched from mlan0 to ethernet
Aug 21 10:06:34 - systemd-networkd[609]: ethernet: Gained carrier
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.025 [I] BorderRouting-: Disabling
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.025 [I] BbrLocal------: Remove BBR Service: seqno (81), delay (5s), timeout (3600s), NotFound
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.025 [I] Mle-----------: AttachState Start -> Idle
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.031 [I] P-Netif-------: Removed multicast address ff33:40:fdde:ad00:beef::1
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.031 [I] P-Netif-------: Removed multicast address ff32:40:fdde:ad00:beef::1
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.032 [I] P-Netif-------: Sent request#6 to remove fdde:ad00:beef:0:d312:1ae0:d8af:82e0/64
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.032 [N] Mle-----------: Role detached -> disabled
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.032 [I] DnssdServer---: Stopped
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.033 [I] P-Netif-------: Sent request#7 to remove fe80::b811:2ec7:e282:2af2/64
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.034 [I] P-Netif-------: Removed multicast address ff02::1
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.034 [I] P-Netif-------: Removed multicast address ff03::1
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.034 [I] P-Netif-------: Removed multicast address ff03::fc
Aug 21 10:06:34 - avahi-daemon[276]: Joining mDNS multicast group on interface ethernet.IPv4 with address 192.168.100.1.
Aug 21 10:06:34 - avahi-daemon[276]: New relevant interface ethernet.IPv4 for mDNS.
Aug 21 10:06:34 - avahi-daemon[276]: Registering new address record for 192.168.100.1 on ethernet.IPv4.
Aug 21 10:06:34 - otbr-agent[623]: 00:04:13.046 [I] TrelInterface-: Disabled interface
Aug 21 10:06:34 - systemd-timesyncd[264]: Network configuration changed, trying to establish connection.
Aug 21 10:06:34 - systemd-networkd[609]: wpan0: Link DOWN
Aug 21 10:06:34 - systemd-networkd[609]: wpan0: Lost carrier
Aug 21 10:06:34 - cpcd[467]: [2026-08-21T10:06:34.528384Z] Info : Endpoint socket openthread/ot-br-posix#12: Client disconnected. 1 connections
Aug 21 10:06:34 - cpcd[467]: [2026-08-21T10:06:34.605484Z] Info : Client disconnected
Aug 21 10:06:34 - systemd[1]: otbr-agent.service: Main process exited, code=exited, status=242/NUMA_POLICY
Aug 21 10:06:34 - systemd[1]: otbr-agent.service: Failed with result 'exit-code'.
Aug 21 10:06:34 - systemd[1]: otbr-agent.service: Consumed 1.554s CPU time.

Logs with strace:

# strace -f -p $(pidof otbr-agent)
strace: Process 690 attached with 2 threads
[pid   744] read(8,  <unfinished ...>
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=110809250}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] lseek(18, 0, SEEK_END)      = 41
[pid   690] lseek(18, 0, SEEK_SET)      = 0
[pid   690] read(18, "\17\0", 2)        = 2
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] lseek(18, 17, SEEK_CUR)     = 21
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] read(18, "\20\0", 2)        = 2
[pid   690] lseek(18, 16, SEEK_CUR)     = 41
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:28 otbr-agent[6"..., 131, MSG_NOSIGNAL, NULL, 0) = 131
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
[pid   690] write(16, "`\0\0\0\0,\21\377\376\200\0\0\0\0\0\0000e\34\2I~H=\377\2\0\0\0\0\0\0"..., 84) = 84
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
[pid   690] sendto(9, "\245\3q?\0A\330\336\37s\377\377=H~I\2\34e2\177;\2\360MLML\4(\0\25"..., 85, MSG_DONTWAIT, NULL, 0) = 85
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=361709000}, NULL) = 1 (in [9], left {tv_sec=0, tv_nsec=346511209})
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, "\0\"\245\6\0\0\0\0\0\0\0\200\0\0\n\0\0\0\0\0\0\0\0\0\0\0\1\0\0\5\0\0"..., 4087, 0, NULL, NULL) = 36
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:28 otbr-agent[6"..., 156, MSG_NOSIGNAL, NULL, 0) = 156
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:28 otbr-agent[6"..., 116, MSG_NOSIGNAL, NULL, 0) = 116
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:28 otbr-agent[6"..., 104, MSG_NOSIGNAL, NULL, 0) = 104
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=0}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=341704000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=93809000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=655066000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=131450000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:29 otbr-agent[6"..., 99, MSG_NOSIGNAL, NULL, 0) = 99
[pid   690] lseek(18, 0, SEEK_END)      = 41
[pid   690] lseek(18, 0, SEEK_SET)      = 0
[pid   690] read(18, "\17\0", 2)        = 2
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] lseek(18, 17, SEEK_CUR)     = 21
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] read(18, "\20\0", 2)        = 2
[pid   690] lseek(18, 16, SEEK_CUR)     = 41
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:29 otbr-agent[6"..., 139, MSG_NOSIGNAL, NULL, 0) = 139
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:29 otbr-agent[6"..., 95, MSG_NOSIGNAL, NULL, 0) = 95
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<13>Aug 21 10:14:29 otbr-agent[6"..., 132, MSG_NOSIGNAL, NULL, 0) = 132
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=203850000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=405879000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=592677000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=155452000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=748834000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=92628000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
-��pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 02 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=655933000}, NULL>	�	$$HH�� = 0x�02 (fla���%Et%�=}9=9	1=
[pid   690] recvfrom(9, 0xfffffdd62�&	��	�^ULL)�HKL�Q�%9�urce temporarily unavailable)
[pid ` 690] pselect6(27, [4 6 9�10 13 15016 17(19 20 22 23�25���], [],`[15 16 17 20 22], {tv_sec=0, tv_nsec=406796000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=591517000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=156541000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=748962000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=91352000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=656936000}, NULL) = 0 (Timeout)
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=341437000}, NULL[   67.851754] ravb 11c20000.ethernet ethernet: Link is Up - 1Gbps/Full - flow control rx/tx
[   67.860049] IPv6: ADDRCONF(NETDEV_CHANGE): ethernet: link becomes ready
) = 1 (in [15], left {tv_sec=0, tv_nsec=207123875})
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] recvfrom(15, [{nlmsg_len=1456, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=0, nlmsg_seq=0, nlmsg_pid=0}, "\x00\x00\x01\x00\x03\x00\x00\x00\x43\x10\x01\x00\x00\x00\x00\x00\x0d\x00\x03\x00\x65\x74\x68\x65\x72\x6e\x65\x74\x00\x00\x00\x00"...], 8192, 0, NULL, NULL) = 1456
[pid   690] pselect6(27, [4 6 9 10 13 15 16 17 19 20 22 23 25 26], [], [15 16 17 20 22], {tv_sec=0, tv_nsec=139910000}, NULL) = 2 (in [6 13], left {tv_sec=0, tv_nsec=139865291})
[pid   690] recvfrom(6, [{nlmsg_len=1456, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=0, nlmsg_seq=0, nlmsg_pid=0}, "\x00\x00\x01\x00\x03\x00\x00\x00\x43\x10\x01\x00\x00\x00\x00\x00\x0d\x00\x03\x00\x65\x74\x68\x65\x72\x6e\x65\x74\x00\x00\x00\x00"...], 8192, 0, NULL, NULL) = 1456
[pid   690] socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 24
[pid   690] ioctl(24, SIOCGIFINDEX, {ifr_name="mlan0", ifr_ifindex=4}) = 0
[pid   690] close(24)                   = 0
[pid   690] socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 24
[pid   690] ioctl(24, SIOCGIFINDEX, {ifr_name="ethernet", ifr_ifindex=3}) = 0
[pid   690] close(24)                   = 0
[pid   690] socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 24
[pid   690] ioctl(24, SIOCGIFFLAGS, {ifr_name="ethernet", ifr_flags=IFF_UP|IFF_BROADCAST|IFF_RUNNING|IFF_MULTICAST}) = 0
[pid   690] close(24)                   = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 118, MSG_NOSIGNAL, NULL, 0) = 118
[pid   690] recvfrom(13, [{nlmsg_len=1456, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=0, nlmsg_seq=0, nlmsg_pid=0}, "\x00\x00\x01\x00\x03\x00\x00\x00\x43\x10\x01\x00\x00\x00\x00\x00\x0d\x00\x03\x00\x65\x74\x68\x65\x72\x6e\x65\x74\x00\x00\x00\x00"...], 8192, 0, NULL, NULL) = 1456
[pid   690] socket(AF_INET6, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 24
[pid   690] ioctl(24, SIOCGIFFLAGS, {ifr_name="mlan0", ifr_flags=IFF_UP|IFF_BROADCAST|IFF_MULTICAST}) = 0
[pid   690] close(24)                   = 0
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid   690] recvfrom(9, 0xfffffdd62100, 4087, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 91, MSG_NOSIGNAL, NULL, 0) = 91
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 86, MSG_NOSIGNAL, NULL, 0) = 86
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 97, MSG_NOSIGNAL, NULL, 0) = 97
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<12>Aug 21 10:14:35 otbr-agent[6"..., 96, MSG_NOSIGNAL, NULL, 0) = 96
[pid   690] close(20)                   = 0
[pid   690] unlinkat(AT_FDCWD, "/run/openthread-wpan0.sock", 0) = 0
[pid   690] flock(21, LOCK_UN)          = 0
[pid   690] close(21)                   = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 79, MSG_NOSIGNAL, NULL, 0) = 79
[pid   690] lseek(18, 0, SEEK_END)      = 41
[pid   690] lseek(18, 0, SEEK_SET)      = 0
[pid   690] read(18, "\17\0", 2)        = 2
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] lseek(18, 17, SEEK_CUR)     = 21
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] read(18, "\20\0", 2)        = 2
[pid   690] lseek(18, 16, SEEK_CUR)     = 41
[pid   690] lseek(18, 0, SEEK_END)      = 41
[pid   690] lseek(18, 0, SEEK_SET)      = 0
[pid   690] read(18, "\17\0", 2)        = 2
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] lseek(18, 17, SEEK_CUR)     = 21
[pid   690] read(18, "\21\0", 2)        = 2
[pid   690] read(18, "\20\0", 2)        = 2
[pid   690] lseek(18, 16, SEEK_CUR)     = 41
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 139, MSG_NOSIGNAL, NULL, 0) = 139
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 95, MSG_NOSIGNAL, NULL, 0) = 95
[pid   690] setsockopt(14, SOL_IPV6, IPV6_DROP_MEMBERSHIP, {inet_pton(AF_INET6, "ff33:40:fdde:ad00:beef::1", &ipv6mr_multiaddr), ipv6mr_interface=if_nametoindex("wpan0")}, 20) = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 121, MSG_NOSIGNAL, NULL, 0) = 121
[pid   690] setsockopt(14, SOL_IPV6, IPV6_DROP_MEMBERSHIP, {inet_pton(AF_INET6, "ff32:40:fdde:ad00:beef::1", &ipv6mr_multiaddr), ipv6mr_interface=if_nametoindex("wpan0")}, 20) = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:35 otbr-agent[6"..., 121, MSG_NOSIGNAL, NULL, 0) = 121
[pid   690] sendto(15, [{nlmsg_len=64, nlmsg_type=0x15 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=6, nlmsg_pid=0}, "\x0a\x40\x02\x03\x07\x00\x00\x00\x14\x00\x02\x00\xfd\xde\xad\x00\xbe\xef\x00\x00\xc5\x8a\xc6\xb6\x1f\x4c\x67\xfc\x14\x00\x06\x00"...], 64, 0, NULL, 0) = 64
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:36 otbr-agent[6"..., 134, MSG_NOSIGNAL, NULL, 0) = 134
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<13>Aug 21 10:14:36 otbr-agent[6"..., 95, MSG_NOSIGNAL, NULL, 0) = 95
[pid   690] close(25)                   = 0
[pid   690] close(26)                   = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:36 otbr-agent[6"..., 77, MSG_NOSIGNAL, NULL, 0) = 77
[pid   690] sendto(15, [{nlmsg_len=64, nlmsg_type=0x15 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=7, nlmsg_pid=0}, "\x0a\x40\x02\x02\x07\x00\x00\x00\x14\x00\x02\x00\xfe\x80\x00\x00\x00\x00\x00\x00\x30\x65\x1c\x02\x49\x7e\x48\x3d\x14\x00\x06\x00"...], 64, 0, NULL, 0) = 64
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:36 otbr-agent[6"..., 123, MSG_NOSIGNAL, NULL, 0) = 123
[pid   690] setsockopt(14, SOL_IPV6, IPV6_DROP_MEMBERSHIP, {inet_pton(AF_INET6, "ff02::1", &ipv6mr_multiaddr), ipv6mr_interface=if_nametoindex("wpan0")}, 20) = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:36 otbr-agent[6"..., 103, MSG_NOSIGNAL, NULL, 0) = 103
[pid   690] setsockopt(14, SOL_IPV6, IPV6_DROP_MEMBERSHIP, {inet_pton(AF_INET6, "ff03::1", &ipv6mr_multiaddr), ipv6mr_interface=if_nametoindex("wpan0")}, 20) = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:36 otbr-agent[6"..., 103, MSG_NOSIGNAL, NULL, 0) = 103
[pid   690] setsockopt(14, SOL_IPV6, IPV6_DROP_MEMBERSHIP, {inet_pton(AF_INET6, "ff03::fc", &ipv6mr_multiaddr), ipv6mr_interface=if_nametoindex("wpan0")}, 20) = 0
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:36 otbr-agent[6"..., 104, MSG_NOSIGNAL, NULL, 0) = 104
[pid   690] sendto(9, "\246\0037\0", 4, MSG_DONTWAIT, NULL, 0) = 4
[pid   690] fcntl(9, F_GETFL)           = 0x802 (flags O_RDWR|O_NONBLOCK)
[pid   690] fcntl(9, F_SETFL, O_RDWR)   = 0
[pid   690] setsockopt(9, SOL_SOCKET, SO_RCVTIMEO_OLD, "\1\0\0\0\0\0\0\0;B\17\0\0\0\0\0", 16) = 0
[pid   690] recvfrom(9, "\0\4\246\0067\0", 4087, 0, NULL, NULL) = 6
[pid   690] sendto(9, "\247\3 \0", 4, MSG_DONTWAIT, NULL, 0) = 4
[pid   690] fcntl(9, F_GETFL)           = 0x2 (flags O_RDWR)
[pid   690] fcntl(9, F_SETFL, O_RDWR)   = 0
[pid   690] setsockopt(9, SOL_SOCKET, SO_RCVTIMEO_OLD, "\1\0\0\0\0\0\0\0<B\17\0\0\0\0\0", 16) = 0
[pid   690] recvfrom(9, "\0\4\247\6 \0", 4087, 0, NULL, NULL) = 6
[pid   690] getpid()                    = 690
[pid   690] sendto(3, "<14>Aug 21 10:14:36 otbr-agent[6"..., 88, MSG_NOSIGNAL, NULL, 0) = 88
[pid   690] close(18)                   = 0
[pid   690] close(12)                   = 0
[pid   690] sendto(7, "\4\f\31\0\0\0", 6, 0, NULL, 0) = 6
[pid   690] recvfrom(7, "\4\f\31\0\0\0", 6, 0, NULL, NULL) = 6
[pid   690] close(9)                    = 0
[pid   690] recvfrom(7, "\4\f\31\0\0\0", 6, 0, NULL, NULL) = 6
[pid   690] close(16)                   = 0
[pid   690] close(14)                   = 0
[pid   690] close(15)                   = 0
[pid   690] close(17)                   = 0
[pid   690] close(19)                   = 0
[pid   690] close(13)                   = 0
[pid   690] close(10)                   = 0
[pid   690] close(11)                   = 0
[pid   690] close(6)                    = 0
[pid   690] close(4)                    = 0
[pid   690] close(5)                    = 0
[pid   690] close(3)                    = 0
[pid   690] exit_group(-14 <unfinished ...>
[pid   744] <... read resumed> <unfinished ...>) = ?
[pid   690] <... exit_group resumed>)   = ?
[pid   744] +++ exited with 242 +++
+++ exited with 242 +++

What I understand

The message from systemd, seems to be a wrong interpretation of the returned value of the application.

Main process exited, code=exited, status=242/NUMA_POLICY

We see in strace that the application return -14.

And -14 = 242 = OT_ERROR_NO_ACK depending on the signed/unsigned form of 8 bits integer.

Is it normal to exit with OT_ERROR_NO_ACK in such situation ?

Unique issue that I found with the 242/NUMA_POLICY pattern was: openthread/ot-br-posix#2152 and it also threat about dynamic changes of backbone interfaces 💃

Note:

Except this, otbr-agent works perfectly, we are running like this since the begining maybe.

In our side we just want to make sure that this is not a bug, in other terms we wan't to make sure that "stopping otbr-agent with exit code 242/-14 is wanted/normal in this situation"

[jwhui]

This is expected behavior by design and not a bug.

1. What Exit Code -14 / 242 Means

The exit value -14 is not OpenThread's OT_ERROR_NO_ACK. Instead, it is OTBR's internal error code OTBR_ERROR_INFRA_LINK_CHANGED = -14.

When the process returns -14, Linux converts it to an 8-bit unsigned exit status (256 - 14 = 242). When systemd logs the exit, it looks up 242 in its internal exit code dictionary and displays status=242/NUMA_POLICY (which corresponds to EXIT_NUMA_POLICY in systemd's exit status table). The NUMA_POLICY label is simply how systemd names exit code 242 and is unrelated to NUMA memory management.

2. Why otbr-agent Exits on Interface Switch

When multiple backbone interfaces are specified using -B (e.g., -B wlan0 -B ethernet), otbr-agent uses InfraLinkSelector to monitor netlink interface state changes.

• On startup, if no interface has carrier, one of the interfaces (e.g., mlan0) is initially selected.
• When an Ethernet cable is plugged in, the ethernet interface transitions to UP+RUNNING.
• InfraLinkSelector evaluates the candidates, sees that ethernet is in a higher-priority state (UP+RUNNING vs UP), and logs:

  [WARN]-ILS-----: Infra link switched from mlan0 to ethernet
  

• Because fully rebinding sockets, mDNS/DNS-SD publishers, multicast routing rules, and border routing parameters across all subsystems dynamically at runtime is complex and prone to edge cases, otbr-agent is intentionally designed to exit with OTBR_ERROR_INFRA_LINK_CHANGED (-14).

3. Recommended Setup

otbr-agent expects the service manager (such as systemd) to restart the process upon failure.

In your systemd service unit (e.g., otbr-agent.service), ensure that restart is configured:

[Service]
Restart=on-failure
RestartSec=2

When otbr-agent exits with code 242, systemd will automatically restart it. On the subsequent start, otbr-agent will evaluate the interfaces and cleanly initialize using the newly active ethernet interface.

[caipiblack]

Thanks, it's all clear!