bisecting fixing commit since 6a24ca2506d64598eac5d5219e99acca9bde4ca5
building syzkaller on 6436ce4bcd8e2c7dcca0b171ac91f51e96d973f8
testing commit 6a24ca2506d64598eac5d5219e99acca9bde4ca5 with gcc (GCC) 8.4.1 20210217
kernel signature: a52f5b244dad7c574e6255a20554a74dd7e695c52ac96be202b215324ecb7d79
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: WARNING: ODEBUG bug in bt_host_release
run #6: crashed: WARNING: ODEBUG bug in bt_host_release
run #7: crashed: WARNING: ODEBUG bug in bt_host_release
run #8: crashed: WARNING: ODEBUG bug in bt_host_release
run #9: crashed: KASAN: use-after-free Read in __queue_work
run #10: crashed: WARNING: ODEBUG bug in bt_host_release
run #11: crashed: WARNING: ODEBUG bug in bt_host_release
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD cf256fbcbe347b7d0ff58fe2dfa382a156bd3694
testing commit cf256fbcbe347b7d0ff58fe2dfa382a156bd3694 with gcc (GCC) 8.4.1 20210217
kernel signature: 31005fcd95e0735ea002951eb2fb57e75d709ac8ae6fac75fe57494943ec83a0
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: general protection fault in __queue_work
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
reproducer seems to be flaky
Reproducer flagged being flaky
revisions tested: 2, total time: 38m6.57096253s (build: 19m59.510460449s, test: 17m41.479434573s)
the crash still happens on HEAD
commit msg: Linux 4.14.231
crash: general protection fault in __queue_work
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci0 command 0x0c1a tx timeout
Bluetooth: hci5 command 0x040f tx timeout
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 27726 Comm: syz-executor.0 Not tainted 4.14.231-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8881d20fc000 task.stack: ffff8881e2da8000
RIP: 0010:__queue_work+0x10e/0xe40 kernel/workqueue.c:1405
RSP: 0018:ffff8881e2daf890 EFLAGS: 00010046
RAX: ffff8881f246e900 RBX: 0000000000000000 RCX: ffff8881f5c00068
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000
RBP: ffff8881e2daf900 R08: ffffffff87f55680 R09: ffffffff87f55688
R10: 0000000000000000 R11: 0000000000000040 R12: ffff8881c79e6280
R13: ffff8881deaa1a40 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f5035792700(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe160adff8 CR3: 00000001dd3e5004 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 queue_work_on+0x140/0x180 kernel/workqueue.c:1490
 queue_work include/linux/workqueue.h:491 [inline]
 req_run+0x2b2/0x590 net/bluetooth/hci_request.c:77
 hci_req_run_skb net/bluetooth/hci_request.c:89 [inline]
 __hci_req_sync+0x297/0x7d0 net/bluetooth/hci_request.c:214
 hci_req_sync+0x70/0xb0 net/bluetooth/hci_request.c:285
 hci_dev_cmd+0x19f/0x670 net/bluetooth/hci_core.c:1890
 hci_sock_ioctl+0x2f0/0x600 net/bluetooth/hci_sock.c:1040
 sock_do_ioctl+0x62/0xa0 net/socket.c:974
 sock_ioctl+0x251/0x430 net/socket.c:1071
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x74/0x80 fs/ioctl.c:692
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465029
RSP: 002b:00007f5035792188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000055d0e0 RCX: 0000000000465029
RDX: 0000000020000040 RSI: 00000000400448dd RDI: 0000000000000004
RBP: 00000000004af6d2 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055d0e0
R13: 00007fff551378ef R14: 00007f5035792300 R15: 0000000000022000
Code: f7 e8 57 a0 ef ff 4c 89 ef 89 c6 e8 dd 76 ff ff 4c 89 e7 48 89 c3 e8 92 df ff ff 48 85 c0 0f 84 da 02 00 00 48 89 da 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 00 0c 00 00 48 39 03 0f 85 75 04 00 00 48 
RIP: __queue_work+0x10e/0xe40 kernel/workqueue.c:1405 RSP: ffff8881e2daf890
---[ end trace 2cfd0ca530efef31 ]---