syzbot


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

Status: upstream: reported C repro on 2025/07/17 18:52
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+92c5daf9a23f04ccfc99@syzkaller.appspotmail.com
Fix commit: 17ce3e5949bc bpf: Disable migration in nf_hook_run_bpf().
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci-upstream-gce-arm64 ci-upstream-kasan-gce-smack-root ci2-upstream-usb]
First crash: 19d, last: 1h34m
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 (926):
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
2025/08/03 14:33 upstream 038d61fd6422 7368264b .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
2025/08/01 14:18 upstream 038d61fd6422 40127d41 .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
2025/08/01 09:14 upstream 038d61fd6422 0c075d67 .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 16:40 upstream 038d61fd6422 f8f2b4da .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 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
2025/07/30 07:43 upstream 038d61fd6422 f8f2b4da .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 02:30 upstream ced1b9e0392d 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 00:06 upstream 86aa72182095 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
2025/07/29 21:41 upstream 86aa72182095 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
2025/07/29 12:28 upstream ced1b9e0392d c4a95487 .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
2025/07/29 11:27 upstream 038d61fd6422 c4a95487 .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
2025/07/29 08:07 upstream ced1b9e0392d c4a95487 .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
2025/07/29 06:17 upstream ced1b9e0392d c4a95487 .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
2025/07/29 03:31 upstream 038d61fd6422 c4a95487 .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
2025/07/28 22:44 upstream 038d61fd6422 c4a95487 .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
2025/07/28 21:36 upstream 038d61fd6422 c4a95487 .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
2025/07/28 14:46 upstream 038d61fd6422 fb8f743d .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
2025/07/31 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
2025/07/30 07:39 upstream 14bed9bc81ba 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
2025/07/29 16:00 upstream ced1b9e0392d ba28e0a8 .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
2025/07/29 15:58 upstream ced1b9e0392d ba28e0a8 .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
2025/07/28 21:44 upstream 038d61fd6422 032c6886 .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
2025/07/28 20:00 upstream 038d61fd6422 032c6886 .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
2025/07/29 05:28 upstream ced1b9e0392d c4a95487 .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
2025/07/29 04:28 upstream ced1b9e0392d c4a95487 .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
2025/07/29 00:47 upstream 038d61fd6422 032c6886 .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
2025/07/29 00:47 upstream 038d61fd6422 032c6886 .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
2025/07/28 20:14 upstream 038d61fd6422 032c6886 .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
2025/08/03 09:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .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
2025/08/02 20:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .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
2025/08/02 19:25 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .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
2025/08/02 15:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .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
2025/08/02 09:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .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
2025/08/02 02:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 40127d41 .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
2025/08/01 03:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 0c075d67 .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
2025/07/31 17:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 0c075d67 .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
2025/07/31 17:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 0c075d67 .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
2025/07/30 21:49 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 f8f2b4da .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
2025/07/30 15:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 f8f2b4da .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
2025/07/30 11:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 f8f2b4da .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
2025/07/30 05:36 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 f8f2b4da .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
2025/07/29 22:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 f8f2b4da .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
2025/07/29 18:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 f8f2b4da .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
2025/07/28 12:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 fb8f743d .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
2025/08/03 12:48 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
2025/08/03 10:50 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.