bisecting fixing commit since f40ddce88593482919761f74910f42f4b84c004b
building syzkaller on 14052202e8d8d0bb407512b6861e9085f9171241
testing commit f40ddce88593482919761f74910f42f4b84c004b with gcc (GCC) 10.2.1 20210217
kernel signature: 401ae697250340a8f19fafbe34755b1004207c8f3a328d8b50087c42f968b433
all runs: crashed: WARNING in __usbhid_submit_report
testing current HEAD 8404c9fbc84b741f66cff7d4934a25dd2c344452
testing commit 8404c9fbc84b741f66cff7d4934a25dd2c344452 with gcc (GCC) 10.2.1 20210217
kernel signature: 75d23134e3c782e86fd9c5e4a370498136763706b431c63cfd49b7278c37505c
run #0: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #1: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #2: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #3: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #4: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #5: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #6: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #7: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #8: crashed: WARNING in __nf_unregister_net_hook
run #9: basic kernel testing failed: WARNING in __nf_unregister_net_hook
revisions tested: 2, total time: 21m43.049755391s (build: 14m36.732951032s, test: 6m12.465660455s)
the crash still happens on HEAD
commit msg: Merge branch 'akpm' (patches from Andrew)
crash: WARNING in __nf_unregister_net_hook
------------[ cut here ]------------
hook not found, pf 3 num 0
WARNING: CPU: 1 PID: 8 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x17a/0x560 net/netfilter/core.c:480
Modules linked in:
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__nf_unregister_net_hook+0x17a/0x560 net/netfilter/core.c:480
Code: 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 03 00 00 8b 53 1c 44 89 e6 48 c7 c7 00 b1 9c 89 4c 89 04 24 e8 16 89 62 01 <0f> 0b 4c 8b 04 24 e9 ba 00 00 00 48 89 ea 48 c1 e2 04 49 8d 7c 10
RSP: 0018:ffffc90000cd7bf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888144232e00 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff5200019af70
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba11fa5b
R10: ffffed1017423f4b R11: 0000000000000001 R12: 0000000000000003
R13: ffff888018420000 R14: ffff888144232e1c R15: ffff888018420f20
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde18d8aac0 CR3: 000000000a68e000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 nf_unregister_net_hook net/netfilter/core.c:502 [inline]
 nf_unregister_net_hooks+0xb1/0xf0 net/netfilter/core.c:576
 ops_pre_exit_list net/core/net_namespace.c:165 [inline]
 cleanup_net+0x3a4/0x990 net/core/net_namespace.c:583
 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275
 worker_thread+0x598/0xf80 kernel/workqueue.c:2421
 kthread+0x36f/0x450 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294