bisecting fixing commit since 728254541ebcc7fee869c3c4c3f36f96be791edb
building syzkaller on 7509bf360eba1461ac6059e4cacfbc29c9d2d4c7
testing commit 728254541ebcc7fee869c3c4c3f36f96be791edb with gcc (GCC) 8.1.0
kernel signature: 8af373db526ebe8da1e1eae6fd119f27f282d25a1a4ff130d3af7ae3bf1a28db
run #0: crashed: WARNING in rfkill_unregister
run #1: crashed: general protection fault in kernfs_add_one
run #2: crashed: WARNING: refcount bug in hci_register_dev
run #3: crashed: WARNING: refcount bug in hci_register_dev
run #4: crashed: WARNING: refcount bug in hci_register_dev
run #5: crashed: WARNING in kernfs_get
run #6: crashed: general protection fault in kernfs_add_one
run #7: crashed: WARNING in kernfs_get
run #8: crashed: WARNING: refcount bug in hci_register_dev
run #9: crashed: WARNING in kernfs_get
testing current HEAD fdfa3a6778b194974df77b384cc71eb2e503639a
testing commit fdfa3a6778b194974df77b384cc71eb2e503639a with gcc (GCC) 8.1.0
kernel signature: 81eef065eb3236c90b42702516751843c901bc5d308b1402889bf271ec9aced8
all runs: crashed: BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
revisions tested: 2, total time: 23m5.533458001s (build: 12m47.638289639s, test: 9m27.607731739s)
the crash still happens on HEAD
commit msg: Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
crash: BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 7978 Comm: kworker/u5:1 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci3 hci_power_on
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x12d/0x187 lib/dump_stack.c:118
 add_chain_cache kernel/locking/lockdep.c:2840 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:2914 [inline]
 validate_chain kernel/locking/lockdep.c:2935 [inline]
 __lock_acquire.cold.65+0x18/0x385 kernel/locking/lockdep.c:3954
 lock_acquire+0x194/0x410 kernel/locking/lockdep.c:4484
 process_one_work+0x824/0x1680 kernel/workqueue.c:2240
 worker_thread+0x85/0xb60 kernel/workqueue.c:2410
 kthread+0x331/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352