syzbot


BUG: assuming non migratable context at ./include/linux/filter.h:LINE

Status: fixed on 2025/09/04 16:57
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+92c5daf9a23f04ccfc99@syzkaller.appspotmail.com
Fix commit: 17ce3e5949bc bpf: Disable migration in nf_hook_run_bpf().
First crash: 64d, last: 25d
Cause bisection: introduced by (bisect log) :
commit 91721c2d02d3a0141df8a4787c7079b89b0d0607
Author: Daniel Xu <dxu@dxuuu.xyz>
Date: Fri Jul 21 20:22:46 2023 +0000

  netfilter: bpf: Support BPF_F_NETFILTER_IP_DEFRAG in netfilter link

Crash: BUG: assuming non migratable context at include/linux/filter.h:LINE (log)
Repro: C syz .config
  
Discussions (4)
Title Replies (including bot) Last reply
[PATCH v2 bpf] bpf: Disable migration in nf_hook_run_bpf(). 3 (3) 2025/07/24 02:10
[PATCH bpf-next] netfilter: bpf: Disable migrate before bpf_prog run 3 (3) 2025/07/20 16:54
[PATCH v1 bpf] bpf: Disable migration in nf_hook_run_bpf(). 4 (4) 2025/07/17 21:41
[syzbot] [netfilter?] [sctp?] BUG: assuming non migratable context at ./include/linux/filter.h:LINE 0 (1) 2025/07/17 18:52
Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/07/16 17:44 22m kuniyu@google.com patch upstream OK log

Sample crash report:
BUG: assuming non migratable context at ./include/linux/filter.h:703
in_atomic(): 0, irqs_disabled(): 0, migration_disabled() 0 pid: 5829, name: sshd-session
3 locks held by sshd-session/5829:
 #0: ffff88807b4e4218 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline]
 #0: ffff88807b4e4218 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x20/0x50 net/ipv4/tcp.c:1395
 #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: __ip_queue_xmit+0x69/0x26c0 net/ipv4/ip_output.c:470
 #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: nf_hook+0xb2/0x680 include/linux/netfilter.h:241
CPU: 0 UID: 0 PID: 5829 Comm: sshd-session Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
 __cant_migrate kernel/sched/core.c:8860 [inline]
 __cant_migrate+0x1c7/0x250 kernel/sched/core.c:8834
 __bpf_prog_run include/linux/filter.h:703 [inline]
 bpf_prog_run include/linux/filter.h:725 [inline]
 nf_hook_run_bpf+0x83/0x1e0 net/netfilter/nf_bpf_link.c:20
 nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline]
 nf_hook_slow+0xbb/0x200 net/netfilter/core.c:623
 nf_hook+0x370/0x680 include/linux/netfilter.h:272
 NF_HOOK_COND include/linux/netfilter.h:305 [inline]
 ip_output+0x1bc/0x2a0 net/ipv4/ip_output.c:433
 dst_output include/net/dst.h:459 [inline]
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 __ip_queue_xmit+0x1d7d/0x26c0 net/ipv4/ip_output.c:527
 __tcp_transmit_skb+0x2686/0x3e90 net/ipv4/tcp_output.c:1479
 tcp_transmit_skb net/ipv4/tcp_output.c:1497 [inline]
 tcp_write_xmit+0x1274/0x84e0 net/ipv4/tcp_output.c:2838
 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:3021
 tcp_push+0x225/0x700 net/ipv4/tcp.c:759
 tcp_sendmsg_locked+0x1870/0x42b0 net/ipv4/tcp.c:1359
 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1396
 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 sock_write_iter+0x4aa/0x5b0 net/socket.c:1131
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x6c7/0x1150 fs/read_write.c:686
 ksys_write+0x1f8/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7d365d407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP:

Crashes (1189):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/15 11:38 upstream 155a3c003e55 03fcfc4b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/15 11:57 upstream 155a3c003e55 03fcfc4b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/15 11:40 upstream 155a3c003e55 03fcfc4b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/16 04:42 upstream 155a3c003e55 03fcfc4b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/15 12:30 linux-next 0be23810e32e 03fcfc4b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/15 11:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 03fcfc4b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/23 12:57 upstream 038d61fd6422 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/23 07:57 upstream 038d61fd6422 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/23 01:58 upstream 038d61fd6422 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/22 18:04 upstream 038d61fd6422 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/22 05:35 upstream 038d61fd6422 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/21 05:07 upstream 038d61fd6422 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/21 00:15 upstream 038d61fd6422 bd178e57 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/20 18:17 upstream 038d61fd6422 bd178e57 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/20 16:10 upstream 038d61fd6422 bd178e57 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/20 16:09 upstream 038d61fd6422 bd178e57 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/20 04:27 upstream 038d61fd6422 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/20 01:55 upstream 038d61fd6422 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/19 20:30 upstream 038d61fd6422 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/19 15:30 upstream 038d61fd6422 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/19 10:57 upstream 038d61fd6422 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/19 08:57 upstream 038d61fd6422 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/19 04:44 upstream 038d61fd6422 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/19 04:43 upstream 038d61fd6422 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/18 15:23 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/18 14:21 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/17 23:51 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/17 15:50 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/17 15:20 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/17 11:15 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/17 10:00 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/17 07:40 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/17 04:08 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/16 20:02 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/16 16:52 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/16 08:31 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/16 05:29 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/15 16:58 upstream 038d61fd6422 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/15 02:21 upstream 038d61fd6422 dcc075fb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/14 17:19 upstream 038d61fd6422 dcc075fb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/14 12:28 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/14 12:26 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/14 10:47 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/14 09:05 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/14 06:55 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/14 05:45 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/13 22:55 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/13 20:54 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/13 11:00 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/13 09:14 upstream 038d61fd6422 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/30 18:42 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/30 12:36 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/30 09:13 upstream 4b290aae788e f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/31 01:16 upstream 4b290aae788e f8f2b4da .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/30 13:37 upstream 4b290aae788e f8f2b4da .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/31 04:06 upstream 4b290aae788e f8f2b4da .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/30 11:34 upstream 4b290aae788e f8f2b4da .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/07/23 19:02 linux-next d086c886ceb9 e1dd4f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/11 11:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: assuming non migratable context at ./include/linux/filter.h:LINE
2025/08/03 12:49 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next fda589c28604 7368264b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 BUG: assuming non migratable context at ./include/linux/filter.h:LINE
* Struck through repros no longer work on HEAD.