bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75 with gcc (GCC) 8.1.0
kernel signature: 3cb82c21114b0bdc8f3497ee9d04d0c6f345413a11f6be0c49866e22af93f941
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: general protection fault in __queue_work
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: KASAN: use-after-free Read in hci_dev_reset
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: KASAN: use-after-free Read in skb_dequeue
run #8: crashed: KASAN: use-after-free Read in skb_dequeue
run #9: OK
testing current HEAD 6b6446efedb27c2766745a04f9b5d4449f51391d
testing commit 6b6446efedb27c2766745a04f9b5d4449f51391d with gcc (GCC) 8.1.0
kernel signature: 440020ecbd352802686ba04d2bb9a94df27190c40a2641f38e45aac19e11b090
run #0: crashed: KASAN: use-after-free Read in __queue_work
run #1: crashed: KASAN: use-after-free Read in skb_dequeue
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: KASAN: use-after-free Read in skb_dequeue
run #6: crashed: general protection fault in __queue_work
run #7: crashed: KASAN: use-after-free Read in skb_dequeue
run #8: crashed: KASAN: use-after-free Read in skb_dequeue
run #9: crashed: general protection fault in __queue_work
revisions tested: 2, total time: 32m31.375214403s (build: 16m29.13129421s, test: 15m23.531567879s)
the crash still happens on HEAD
commit msg: Linux 4.14.204
crash: general protection fault in __queue_work
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci3 command 0x041b 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: 21331 Comm: syz-executor.0 Not tainted 4.14.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a134e180 task.stack: ffff88809cdf0000
RIP: 0010:__queue_work+0x128/0xea0 kernel/workqueue.c:1406
RSP: 0018:ffff88809cdf7858 EFLAGS: 00010046
RAX: ffff8880b3aec8c0 RBX: 0000000000000000 RCX: ffff8880b6000068
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000
RBP: ffff88809cdf78d0 R08: ffffffff87f55580 R09: ffffffff87f55588
R10: 0000000000000000 R11: 0000000000000040 R12: 0000000000000000
R13: ffff88809d312a40 R14: 0000000000000040 R15: dffffc0000000000
FS:  00007f3606a72700(0000) GS:ffff8880ba800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016a8660 CR3: 00000000b44e1000 CR4: 00000000001406f0
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_inquiry+0x57d/0x790 net/bluetooth/hci_core.c:1272
 hci_sock_ioctl+0x199/0x600 net/bluetooth/hci_sock.c:1043
 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: 0033:0x45ce79
RSP: 002b:00007f3606a71c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000e640 RCX: 000000000045ce79
RDX: 0000000020000000 RSI: 00000000800448f0 RDI: 0000000000000005
RBP: 000000000118c0a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118c06c
R13: 00007ffdd8b08acf R14: 00007f3606a729c0 R15: 000000000118c06c
Code: e8 6e 89 ef ff 4c 89 ef 89 c6 e8 64 77 ff ff 48 8b 7d d0 49 89 c4 e8 b8 df ff ff 48 85 c0 0f 84 d5 02 00 00 4c 89 e2 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 4b 0c 00 00 49 39 04 24 0f 85 84 04 00 00 
RIP: __queue_work+0x128/0xea0 kernel/workqueue.c:1406 RSP: ffff88809cdf7858
---[ end trace c4761747598b944d ]---