bisecting fixing commit since e8878ab825450c9ac07a0fc22e1f66fdb62b4f72
building syzkaller on 79fb24e23d3bc27ad2cbb1595e76860ef9743d86
testing commit e8878ab825450c9ac07a0fc22e1f66fdb62b4f72 with gcc (GCC) 8.4.1 20210217
kernel signature: eaab7609560d8fc2b2b62cd12b219036061254834125fa58e144589629f1d82d
run #0: crashed: WARNING in hci_conn_timeout
run #1: crashed: WARNING in corrupted
run #2: crashed: WARNING in corrupted
run #3: crashed: WARNING in hci_conn_timeout
run #4: crashed: WARNING in corrupted
run #5: crashed: WARNING in corrupted
run #6: crashed: WARNING in corrupted
run #7: crashed: WARNING in corrupted
run #8: crashed: WARNING in hci_conn_timeout
run #9: crashed: WARNING in corrupted
run #10: crashed: WARNING in corrupted
run #11: crashed: WARNING in corrupted
run #12: crashed: WARNING in corrupted
run #13: crashed: WARNING in hci_conn_timeout
run #14: crashed: WARNING in corrupted
run #15: crashed: WARNING in hci_conn_timeout
run #16: crashed: WARNING in hci_conn_timeout
run #17: crashed: WARNING in corrupted
run #18: crashed: WARNING in corrupted
run #19: crashed: WARNING in corrupted
testing current HEAD f69d02e37a85645aa90d18cacfff36dba370f797
testing commit f69d02e37a85645aa90d18cacfff36dba370f797 with gcc (GCC) 10.2.1 20210217
kernel signature: c6f037802bd321740acb98aa776be972a7cdbf2e7153bd8f3a755456422c0e5a
run #0: crashed: WARNING in hci_conn_timeout
run #1: crashed: WARNING in corrupted
run #2: crashed: WARNING in hci_conn_timeout
run #3: crashed: WARNING in hci_conn_timeout
run #4: crashed: WARNING in hci_conn_timeout
run #5: crashed: WARNING in hci_conn_timeout
run #6: crashed: WARNING in hci_conn_timeout
run #7: crashed: WARNING in hci_conn_timeout
run #8: crashed: WARNING in hci_conn_timeout
run #9: crashed: WARNING in hci_conn_timeout
revisions tested: 2, total time: 25m17.526150996s (build: 12m32.929739456s, test: 12m3.653059745s)
the crash still happens on HEAD
commit msg: Merge tag 'misc-5.12-2021-03-02' of git://git.kernel.dk/linux-block
crash: WARNING in hci_conn_timeout
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6141 at net/bluetooth/hci_conn.c:445 queue_work include/linux/workqueue.h:507 [inline]
WARNING: CPU: 0 PID: 6141 at net/bluetooth/hci_conn.c:445 schedule_work include/linux/workqueue.h:568 [inline]
WARNING: CPU: 0 PID: 6141 at net/bluetooth/hci_conn.c:445 hci_connect_le_scan_remove net/bluetooth/hci_conn.c:195 [inline]
WARNING: CPU: 0 PID: 6141 at net/bluetooth/hci_conn.c:445 hci_conn_timeout+0x1cf/0x230 net/bluetooth/hci_conn.c:460
Modules linked in:
CPU: 0 PID: 6141 Comm: kworker/u5:4 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x1cf/0x230 net/bluetooth/hci_conn.c:445
Code: ff df 48 8d 93 a0 02 00 00 48 c1 e8 03 80 3c 08 00 75 4c 48 8b 35 a1 85 be 03 48 83 c4 08 bf 40 00 00 00 5b 5d e9 01 e2 c0 fa <0f> 0b e9 85 fe ff ff 48 89 ef e8 92 77 1f fb e9 64 fe ff ff e8 68
RSP: 0018:ffffc900009b7d08 EFLAGS: 00010282
RAX: 00000000ffff9e38 RBX: ffff88812e7b6130 RCX: ffffffff8684c4cd
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88812e7b6010
RBP: ffff88812e7b6010 R08: 0000000000000000 R09: ffff88812e7b6013
R10: ffffed1025cf6c02 R11: 0000000000000000 R12: ffffc900009b7db0
R13: ffff888108934400 R14: ffff88812e7b6130 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a1e608 CR3: 00000001129eb003 CR4: 00000000001706f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275
 worker_thread+0x598/0xf80 kernel/workqueue.c:2421
 kthread+0x36f/0x450 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294