bisecting fixing commit since d18b78abc0c6e7d3119367c931c583e02d466495 building syzkaller on 6436ce4bcd8e2c7dcca0b171ac91f51e96d973f8 testing commit d18b78abc0c6e7d3119367c931c583e02d466495 with gcc (GCC) 8.4.1 20210217 kernel signature: 44540a7314827902698ac7d5ea1b14957cf12f712f59363556cb5ac677c0868c run #0: crashed: WARNING: ODEBUG bug in bt_host_release run #1: crashed: KASAN: use-after-free Read in __queue_work run #2: crashed: general protection fault in __queue_work 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: 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: OK run #10: OK run #11: crashed: general protection fault in __queue_work 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 78fec1611cbf7b0bdaddfdbf174a3a2463663bff testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217 kernel signature: 66c4c381ee45f82b7cf66f86f8781af8ab926cbbed4a72075478b806ba4f7880 run #0: crashed: KASAN: use-after-free Read in __queue_work run #1: crashed: general protection fault in __queue_work 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: 33m8.697406074s (build: 15m25.206714063s, test: 17m13.686462592s) the crash still happens on HEAD commit msg: Linux 4.19.183 crash: general protection fault in __queue_work IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready Bluetooth: hci0: command 0x0c1a 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: 1 PID: 14770 Comm: syz-executor.4 Not tainted 4.19.183-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 82 d2 ee ff 4c 89 e7 89 c6 e8 d8 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 45 0b 00 00 49 39 06 0f 85 b4 04 00 00 48 89 RSP: 0018:ffff8881e30476a0 EFLAGS: 00010046 RAX: ffff8881f28d24c0 RBX: ffff8881d3b095e8 RCX: ffff8881f6000068 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffff8881e3047710 R08: ffffffff8855afa0 R09: ffffffff8855afe0 R10: 0000000000000000 R11: 0000000000000040 R12: ffff8881e8121a00 R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007ff605d64700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564d25b25e08 CR3: 00000001cf5b1005 CR4: 00000000001606e0 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:1936 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: 0033:0x465029 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:00007ff605d64188 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: 00007ffc332fa03f R14: 00007ff605d64300 R15: 0000000000022000 Modules linked in: ---[ end trace 5d8e5342e3a1ece4 ]--- RIP: 0010:__queue_work+0x163/0xdf0 kernel/workqueue.c:1404 Code: e8 82 d2 ee ff 4c 89 e7 89 c6 e8 d8 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 45 0b 00 00 49 39 06 0f 85 b4 04 00 00 48 89 RSP: 0018:ffff8881e30476a0 EFLAGS: 00010046 RAX: ffff8881f28d24c0 RBX: ffff8881d3b095e8 RCX: ffff8881f6000068 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffff8881e3047710 R08: ffffffff8855afa0 R09: ffffffff8855afe0 R10: 0000000000000000 R11: 0000000000000040 R12: ffff8881e8121a00 R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007ff605d64700(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564d25b25e08 CR3: 00000001cf5b1005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400