bisecting fixing commit since fb893de323e2d39f7a1f6df425703a2edbdf56ea
building syzkaller on bc15f7dbbc1c6e2042a7115b3fdacc0ada8c35e7
testing commit fb893de323e2d39f7a1f6df425703a2edbdf56ea with gcc (GCC) 8.1.0
kernel signature: e5af48aa0d7ced566c2aff2ff1963b9fdb65fa7e7d946b03d13e7a0938584891
run #0: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #1: crashed: WARNING: locking bug in l2cap_sock_teardown_cb
run #2: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #3: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #4: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #5: crashed: WARNING: locking bug in l2cap_sock_teardown_cb
run #6: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #7: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #8: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #9: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
testing current HEAD e609571b5ffa3528bf85292de1ceaddac342bc1c
testing commit e609571b5ffa3528bf85292de1ceaddac342bc1c with gcc (GCC) 8.1.0
kernel signature: f6a3f813b9e7d8c6a6494d54cffef2fe5e5088c8c78e3199927577e99f222e1e
run #0: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #1: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #2: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #3: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #4: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #5: crashed: WARNING: locking bug in l2cap_sock_teardown_cb
run #6: crashed: WARNING: locking bug in l2cap_sock_teardown_cb
run #7: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #8: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
run #9: crashed: INFO: trying to register non-static key in l2cap_sock_teardown_cb
revisions tested: 2, total time: 17m50.304647893s (build: 10m16.607421414s, test: 6m55.750751758s)
the crash still happens on HEAD
commit msg: Merge tag 'nfs-for-5.11-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
crash: INFO: trying to register non-static key in l2cap_sock_teardown_cb
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 7332 Comm: kworker/1:4 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0xa3/0xc8 lib/dump_stack.c:120
 assign_lock_key kernel/locking/lockdep.c:935 [inline]
 register_lock_class+0x575/0x580 kernel/locking/lockdep.c:1247
 __lock_acquire+0x75/0x1770 kernel/locking/lockdep.c:4711
 lock_acquire+0xf9/0x420 kernel/locking/lockdep.c:5437
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x2c/0x90 net/core/sock.c:3049
 l2cap_sock_teardown_cb+0x1f/0x130 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0x35/0x320 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0xfb/0x270 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x70/0xe0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x293/0x600 kernel/workqueue.c:2275
 worker_thread+0x38/0x380 kernel/workqueue.c:2421
 kthread+0x145/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296