bisecting fixing commit since e8878ab825450c9ac07a0fc22e1f66fdb62b4f72
building syzkaller on 79fb24e23d3bc27ad2cbb1595e76860ef9743d86
testing commit e8878ab825450c9ac07a0fc22e1f66fdb62b4f72 with gcc (GCC) 8.1.0
kernel signature: b6238250c054b7a6a99988feb88ccb7e7c0012c23056387c23716699b68c8d50
run #0: crashed: WARNING in corrupted
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 hci_conn_timeout
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
testing current HEAD f8ad8187c3b536ee2b10502a8340c014204a1af0
testing commit f8ad8187c3b536ee2b10502a8340c014204a1af0 with gcc (GCC) 8.1.0
kernel signature: 43303bafec3e6c5ecf275ca6ed1f348913f100ad262db8ef06dd316c6a19f0bd
all runs: crashed: WARNING in hci_conn_timeout
revisions tested: 2, total time: 20m13.703116435s (build: 10m8.099346059s, test: 9m21.160190598s)
the crash still happens on HEAD
commit msg: fs/pipe: allow sendfile() to pipe again
crash: WARNING in hci_conn_timeout
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6219 at net/bluetooth/hci_conn.c:412 queue_work include/linux/workqueue.h:507 [inline]
WARNING: CPU: 1 PID: 6219 at net/bluetooth/hci_conn.c:412 schedule_work include/linux/workqueue.h:568 [inline]
WARNING: CPU: 1 PID: 6219 at net/bluetooth/hci_conn.c:412 hci_connect_le_scan_remove net/bluetooth/hci_conn.c:195 [inline]
WARNING: CPU: 1 PID: 6219 at net/bluetooth/hci_conn.c:412 hci_conn_timeout+0xb9/0xc0 net/bluetooth/hci_conn.c:427
Modules linked in:
CPU: 1 PID: 6219 Comm: kworker/u5:7 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci3 hci_conn_timeout

RIP: 0010:hci_conn_timeout+0xb9/0xc0 net/bluetooth/hci_conn.c:412
Code: fd e7 44 ff 48 8d bb e8 02 00 00 e8 f1 e7 44 ff 48 8d 93 a0 02 00 00 5b bf 40 00 00 00 48 8b 35 6d ad d0 01 5d e9 37 2f 5b fe <0f> 0b e9 52 ff ff ff 83 ee 03 b8 01 00 00 00 40 80 fe 01 77 0f 0f
RSP: 0018:ffffc900002cbe40 EFLAGS: 00010286

RAX: 00000000fffffef6 RBX: ffff888106bf3c00 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83ea802c RDI: ffff88810453a130
RBP: ffffc900002cbec8 R08: ffffffff85fe2a48 R09: ffffffff85de8750
R10: ffffffff849e8d28 R11: 0000000000000002 R12: ffff88810e3a9400
R13: 0000000000000000 R14: ffff88810453a130 R15: ffff88810453a138
FS:  0000000000000000(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9684c17000 CR3: 000000010bd0f004 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 process_one_work+0x293/0x600 kernel/workqueue.c:2275
 worker_thread+0x38/0x380 kernel/workqueue.c:2421