bisecting fixing commit since d18b78abc0c6e7d3119367c931c583e02d466495 building syzkaller on 6436ce4bcd8e2c7dcca0b171ac91f51e96d973f8 testing commit d18b78abc0c6e7d3119367c931c583e02d466495 with gcc (GCC) 8.1.0 kernel signature: 76fdc6ef75df45c508f1252bf03d8a021618ceab5d79952ebb38d80773d9c604 run #0: crashed: general protection fault in __queue_work run #1: crashed: general protection fault in __queue_work run #2: crashed: general protection fault in __queue_work run #3: crashed: general protection fault in __queue_work run #4: crashed: WARNING: ODEBUG bug in bt_host_release run #5: crashed: WARNING: ODEBUG bug in bt_host_release run #6: OK run #7: OK run #8: OK run #9: OK testing current HEAD 2c746135a12e3f329171ed168ca0078d468f6d85 testing commit 2c746135a12e3f329171ed168ca0078d468f6d85 with gcc (GCC) 8.1.0 kernel signature: f3687d5e91f19422a6f59b65ecdf2297d01f44e750a21dc3bbfd6b73e0bb4ad0 run #0: crashed: general protection fault in __queue_work run #1: crashed: KASAN: use-after-free Read 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: WARNING: ODEBUG bug in bt_host_release run #6: crashed: general protection fault in __queue_work run #7: crashed: general protection fault in __queue_work run #8: crashed: general protection fault in __queue_work run #9: OK revisions tested: 2, total time: 37m41.299458909s (build: 18m8.633277144s, test: 18m42.101266112s) the crash still happens on HEAD commit msg: Linux 4.19.158 crash: general protection fault in __queue_work Bluetooth: hci0: command 0x0c1a tx timeout Bluetooth: hci1: command 0x0419 tx timeout Bluetooth: hci0: command 0x0c1a 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: 28126 Comm: syz-executor.3 Not tainted 4.19.158-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 22 b7 ee ff 4c 89 e7 89 c6 e8 68 81 ff ff 48 89 df 49 89 c6 e8 ed 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 45 0b 00 00 49 39 06 0f 85 b4 04 00 00 48 89 RSP: 0018:ffff88808d8c76a0 EFLAGS: 00010046 RAX: ffff8880b36d9b40 RBX: ffff88807f471ea8 RCX: ffff8880b5c00068 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffff88808d8c7710 R08: ffffffff8855ad80 R09: ffffffff8855adc0 R10: 0000000000000000 R11: 0000000000000040 R12: ffff8880b4e09080 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007ff1e6690700(0000) GS:ffff8880ba600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563720365ef8 CR3: 000000007f7fb000 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+0x2b2/0x590 net/bluetooth/hci_request.c:87 hci_req_run_skb net/bluetooth/hci_request.c:99 [inline] __hci_req_sync+0x1bb/0x830 net/bluetooth/hci_request.c:212 hci_req_sync+0x70/0xb0 net/bluetooth/hci_request.c:279 hci_dev_cmd+0x1a7/0x6b0 net/bluetooth/hci_core.c:1934 hci_sock_ioctl+0x4b2/0x600 net/bluetooth/hci_sock.c:1045 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: 0033:0x45d4d9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff1e668fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001e000 RCX: 000000000045d4d9 RDX: 0000000020000040 RSI: 00000000400448dd RDI: 0000000000000004 RBP: 000000000118d160 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d12c R13: 00007fff7466f3af R14: 00007ff1e66909c0 R15: 000000000118d12c Modules linked in: ---[ end trace fd5ed99fc1edbc12 ]--- RIP: 0010:__queue_work+0x163/0xdf0 kernel/workqueue.c:1404 Code: e8 22 b7 ee ff 4c 89 e7 89 c6 e8 68 81 ff ff 48 89 df 49 89 c6 e8 ed 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 45 0b 00 00 49 39 06 0f 85 b4 04 00 00 48 89 RSP: 0018:ffff88808d8c76a0 EFLAGS: 00010046 RAX: ffff8880b36d9b40 RBX: ffff88807f471ea8 RCX: ffff8880b5c00068 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffff88808d8c7710 R08: ffffffff8855ad80 R09: ffffffff8855adc0 R10: 0000000000000000 R11: 0000000000000040 R12: ffff8880b4e09080 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007ff1e6690700(0000) GS:ffff8880ba600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563720365ef8 CR3: 000000007f7fb000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400