bisecting fixing commit since 37f368d8d09d2190e64cdb1cd73d56e3ad50c3df
building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9
testing commit 37f368d8d09d2190e64cdb1cd73d56e3ad50c3df with gcc (GCC) 10.2.1 20210217
kernel signature: 3e51e5664ed94257fe7f3006e2481ed0990d74a9042900a2a77c3616180e503f
all runs: crashed: WARNING: suspicious RCU usage in ip6_mc_find_dev_rtnl
testing current HEAD 9d31d2338950293ec19d9b095fbaa9030899dcb4
testing commit 9d31d2338950293ec19d9b095fbaa9030899dcb4 with gcc (GCC) 10.2.1 20210217
kernel signature: ccb35f90c8e57c9df0dd0313d978dae5d58b65b41b7832a9f80c3df1ed51c839
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: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #9: crashed: WARNING in __nf_unregister_net_hook
revisions tested: 2, total time: 23m0.361286253s (build: 15m49.392162844s, test: 6m28.931022993s)
the crash still happens on HEAD
commit msg: Merge tag 'net-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
crash: WARNING in __nf_unregister_net_hook
WARNING: CPU: 0 PID: 155 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x17a/0x560 net/netfilter/core.c:480
Modules linked in:
CPU: 0 PID: 155 Comm: kworker/u4:3 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 20 71 9f 89 4c 89 04 24 e8 28 a3 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:ffffc9000157fbf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8880200bf800 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff520002aff70
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba01fa5b
R10: ffffed1017403f4b R11: 0000000000000001 R12: 0000000000000003
R13: ffff888013f20000 R14: ffff8880200bf81c R15: ffff888013f20f20
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24ea5f2000 CR3: 0000000013ff6000 CR4: 00000000001506f0
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