bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072 building syzkaller on a52ee10ae11c1342cfca60cf3957619bcf92bd1a testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 with gcc (GCC) 8.4.1 20210217 kernel signature: da4dce6c5915e54ef135c47cbb168d1af29379ce3eac8e213b207a4c3e7aa5dc run #0: boot failed: failed to create instance: googleapi: Error 503: Internal error. Please try again or contact Google Support. (Code: '5BD6159E15009.AA14A85.280284D1'), backendError 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 __queue_work run #4: crashed: WARNING: ODEBUG bug in bt_host_release run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK reproducer seems to be flaky testing current HEAD 030194a5b292bb7613407668d85af0b987bb9839 testing commit 030194a5b292bb7613407668d85af0b987bb9839 with gcc (GCC) 8.4.1 20210217 kernel signature: 2ac768f94331168fbd3e2366f8328c5ba995aa14470ec190a2340715c48007ee run #0: crashed: general protection fault in __queue_work run #1: crashed: general protection fault in __queue_work run #2: crashed: WARNING: ODEBUG bug in bt_host_release run #3: crashed: general protection fault in __queue_work run #4: crashed: general protection fault in __queue_work run #5: crashed: general protection fault in __queue_work run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK Reproducer flagged being flaky revisions tested: 2, total time: 34m5.133362011s (build: 15m18.372517187s, test: 18m15.809330135s) the crash still happens on HEAD commit msg: Linux 4.19.180 crash: general protection fault in __queue_work Bluetooth: hci5: command 0x041b tx timeout Bluetooth: hci0: command 0x0401 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 CPU: 0 PID: 19861 Comm: syz-executor.0 Not tainted 4.19.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__queue_work+0x163/0xdf0 kernel/workqueue.c:1404 Code: e8 32 d2 ee ff 4c 89 e7 89 c6 e8 b8 80 ff ff 48 89 df 49 89 c6 e8 bd dc ff ff 48 85 c0 0f 84 9d 02 00 00 4c 89 f2 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 44 0b 00 00 49 39 06 0f 85 b4 04 00 00 48 89 RSP: 0018:ffff88808f24f668 EFLAGS: 00010046 RAX: ffff8880b24d9b40 RBX: ffff8880a2946568 RCX: ffff88813bfc9068 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffff88808f24f6d8 R08: ffffffff8994c840 R09: ffffffff8994c880 R10: 0000000000000000 R11: 0000000000000040 R12: ffff8880a1938500 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f7d9a10a700(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f36f3692718 CR3: 00000000a2afc000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: queue_work_on+0x140/0x180 kernel/workqueue.c:1488 queue_work include/linux/workqueue.h:512 [inline] req_run+0x2bd/0x600 net/bluetooth/hci_request.c:87 hci_req_run_skb net/bluetooth/hci_request.c:99 [inline] __hci_req_sync+0x1f8/0x8a0 net/bluetooth/hci_request.c:212 hci_req_sync+0x70/0xb0 net/bluetooth/hci_request.c:279 hci_inquiry+0x5fd/0x800 net/bluetooth/hci_core.c:1310 hci_sock_ioctl+0x1a3/0x620 net/bluetooth/hci_sock.c:1048 sock_do_ioctl+0xd9/0x230 net/socket.c:950 sock_ioctl+0x281/0x500 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7d9a10a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000020000240 RSI: 00000000800448f0 RDI: 0000000000000005 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff6af12faf R14: 00007f7d9a10a300 R15: 0000000000022000 Modules linked in: ---[ end trace acf14b928e334a10 ]--- RIP: 0010:__queue_work+0x163/0xdf0 kernel/workqueue.c:1404 Code: e8 32 d2 ee ff 4c 89 e7 89 c6 e8 b8 80 ff ff 48 89 df 49 89 c6 e8 bd dc ff ff 48 85 c0 0f 84 9d 02 00 00 4c 89 f2 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 44 0b 00 00 49 39 06 0f 85 b4 04 00 00 48 89 RSP: 0018:ffff88808f24f668 EFLAGS: 00010046 RAX: ffff8880b24d9b40 RBX: ffff8880a2946568 RCX: ffff88813bfc9068 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffff88808f24f6d8 R08: ffffffff8994c840 R09: ffffffff8994c880 R10: 0000000000000000 R11: 0000000000000040 R12: ffff8880a1938500 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f7d9a10a700(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f36f3692718 CR3: 00000000a2afc000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400