bisecting fixing commit since c2568c8c9e636a56abf31da4b28b65d3ded02524
building syzkaller on 1880b4a9f394370a7d1fcb5c1cfca0fa1127b463
testing commit c2568c8c9e636a56abf31da4b28b65d3ded02524 with gcc (GCC) 8.1.0
kernel signature: a9267707b069af256657cadb4e985f63a7e00b25a8201b01dae17ba52e0fdc1f
run #0: crashed: BUG: workqueue lockup
run #1: crashed: BUG: workqueue lockup
run #2: crashed: BUG: workqueue lockup
run #3: crashed: BUG: workqueue lockup
run #4: crashed: BUG: workqueue lockup
run #5: crashed: BUG: workqueue lockup
run #6: crashed: BUG: workqueue lockup
run #7: OK
run #8: crashed: BUG: workqueue lockup
run #9: OK
testing current HEAD 7f356166aebb0d956d367dfe55e19d7783277d09
testing commit 7f356166aebb0d956d367dfe55e19d7783277d09 with gcc (GCC) 8.1.0
kernel signature: ad39e4207e501c69b8b55595e2b241047822456a726bfae5b540c154b7de7470
all runs: crashed: WARNING in sk_stream_kill_queues
revisions tested: 2, total time: 24m22.109369924s (build: 10m19.259841704s, test: 13m17.436372037s)
the crash still happens on HEAD
commit msg: nfp: Replace zero-length array with flexible-array member
crash: WARNING in sk_stream_kill_queues
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7491 at net/core/stream.c:208 sk_stream_kill_queues+0x10e/0x120 net/core/stream.c:208
Modules linked in:
CPU: 1 PID: 7491 Comm: syz-executor.0 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:sk_stream_kill_queues+0x10e/0x120 net/core/stream.c:208
Code: 00 85 c0 75 1f 85 f6 75 21 5b 5d c3 48 89 df e8 98 e1 fe ff 8b 83 68 02 00 00 8b b3 20 02 00 00 85 c0 74 e1 0f 0b 85 f6 74 df <0f> 0b 5b 5d c3 0f 0b eb ac 66 0f 1f 84 00 00 00 00 00 8b 97 64 02
RSP: 0018:ffffc900022d3ce8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff888117e1a080 RCX: 0000000000000001
RDX: ffffffff84ce4290 RSI: 0000000000000e28 RDI: ffff888117e1a080
RBP: ffff888117e1a1d0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffffc900022d3d00
R13: ffff888117e1a8f0 R14: 0000000000000001 R15: 0000000000000000
FS:  00007fef54dcc700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f15da52f018 CR3: 0000000117dc8002 CR4: 00000000001706f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __mptcp_destroy_sock+0x146/0x210 net/mptcp/protocol.c:2513
 mptcp_close+0x23b/0x310 net/mptcp/protocol.c:2562
 inet_release+0x37/0x70 net/ipv4/af_inet.c:431
 __sock_release+0x32/0xa0 net/socket.c:596
 sock_close+0xf/0x20 net/socket.c:1255
 __fput+0xaa/0x250 fs/file_table.c:281
 task_work_run+0x68/0xb0 kernel/task_work.c:151
 get_signal+0x600/0xc70 kernel/signal.c:2562
 arch_do_signal+0x2b/0x900 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x1a2/0x220 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x7a/0x2c0 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45de29
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fef54dcbc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: fffffffffffffe00 RBX: 000000000002e880 RCX: 000000000045de29
RDX: 00000000ffffffe7 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000118bf78 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000c000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007fff24b7e0ef R14: 00007fef54dcc9c0 R15: 000000000118bf2c