bisecting fixing commit since 1e78030e5e5b2d8b0cad7136caf9cfab986a6bff
building syzkaller on 835dffe7e5d185154a9b147476a17b6301ee139e
testing commit 1e78030e5e5b2d8b0cad7136caf9cfab986a6bff with gcc (GCC) 8.1.0
kernel signature: ea6dcda869e50ec80da4d9fcf273cc95349d38fbf105a8cdefb11a99078c4d3d
run #0: crashed: general protection fault in kernfs_add_one
run #1: crashed: WARNING in kernfs_get
run #2: crashed: WARNING in kernfs_get
run #3: crashed: general protection fault in kernfs_add_one
run #4: crashed: general protection fault in kernfs_add_one
run #5: crashed: WARNING in kernfs_get
run #6: crashed: WARNING in kernfs_get
run #7: crashed: general protection fault in kernfs_add_one
run #8: crashed: general protection fault in kernfs_add_one
run #9: crashed: general protection fault in kernfs_add_one
testing current HEAD fb33c6510d5595144d585aa194d377cf74d31911
testing commit fb33c6510d5595144d585aa194d377cf74d31911 with gcc (GCC) 8.1.0
kernel signature: 7acd614370dfcfe59c0371db404068876950ce3d61e57b107ab531144132d801
all runs: crashed: BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
revisions tested: 2, total time: 20m36.877598489s (build: 12m3.534451583s, test: 7m47.067936103s)
the crash still happens on HEAD
commit msg: Linux 5.6-rc6
crash: BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 8552 Comm: kworker/u5:2 Not tainted 5.6.0-rc6-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
 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
 _raw_read_lock+0x30/0x40 kernel/locking/spinlock.c:223
 led_trigger_event+0x28/0xc0 drivers/leds/led-triggers.c:371
 hci_leds_update_powered+0x52/0x160 net/bluetooth/leds.c:24
 hci_dev_do_open+0x5a1/0x1410 net/bluetooth/hci_core.c:1549
 hci_power_on+0x100/0x4d0 net/bluetooth/hci_core.c:2193
 process_one_work+0x88b/0x1680 kernel/workqueue.c:2266
 worker_thread+0x85/0xb60 kernel/workqueue.c:2412
 kthread+0x331/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352