bisecting fixing commit since e68061375f792af245fefbc13e3e078fa92d3539
building syzkaller on 52e3731913ab2677be27c29ed8142b04e8f28521
testing commit e68061375f792af245fefbc13e3e078fa92d3539 with gcc (GCC) 10.2.1 20210217
kernel signature: 7655392819de5033a383aec477f58329f9b02d8cdce0e2c0917fc7a6ec53fdbe
run #0: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon
run #1: crashed: INFO: rcu detected stall in corrupted
run #2: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon
run #3: crashed: INFO: rcu detected stall in do_idle
run #4: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon
run #5: crashed: INFO: rcu detected stall in wg_packet_handshake_receive_worker
run #6: crashed: INFO: rcu detected stall in corrupted
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: crashed: INFO: rcu detected stall in corrupted
run #9: crashed: INFO: rcu detected stall in smp_call_function
run #10: crashed: INFO: rcu detected stall in smp_call_function
run #11: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon
run #12: crashed: INFO: rcu detected stall in ip6_mc_input
run #13: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon
run #14: crashed: INFO: rcu detected stall in ieee80211_iface_work
run #15: crashed: INFO: rcu detected stall in wg_packet_handshake_send_worker
run #16: crashed: INFO: rcu detected stall in corrupted
run #17: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon
run #18: crashed: INFO: rcu detected stall in wg_packet_handshake_receive_worker
run #19: crashed: INFO: rcu detected stall in smp_call_function
testing current HEAD 27787ba3fa4904422b3928b898d1bd3d74d98bea
testing commit 27787ba3fa4904422b3928b898d1bd3d74d98bea with gcc (GCC) 10.2.1 20210217
kernel signature: 53dff292fcf656cb5164a73822ec718667ba0924d8defaef20ab5c3fbf7d916f
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: crashed: WARNING in __nf_unregister_net_hook
run #8: crashed: WARNING in __nf_unregister_net_hook
run #9: crashed: WARNING in __nf_unregister_net_hook
revisions tested: 2, total time: 22m29.503156579s (build: 11m23.507008603s, test: 10m22.125291089s)
the crash still happens on HEAD
commit msg: Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
crash: WARNING in __nf_unregister_net_hook
------------[ cut here ]------------
hook not found, pf 3 num 0
WARNING: CPU: 1 PID: 4510 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x17a/0x560 net/netfilter/core.c:480
Modules linked in:
CPU: 1 PID: 4510 Comm: kworker/u4:6 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 9d 89 4c 89 04 24 e8 86 86 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:ffffc9000a15fbf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888022861f00 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff5200142bf70
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba11fa5b
R10: ffffed1017423f4b R11: 0000000000000001 R12: 0000000000000003
R13: ffff88802cb78000 R14: ffff888022861f1c R15: ffff88802cb78f20
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff6c7adff8 CR3: 0000000025801000 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