[ 87.930249][ T27] audit: type=1800 audit(1585161255.689:27): pid=9870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 87.990375][ T27] audit: type=1800 audit(1585161255.709:28): pid=9870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 88.840026][ T27] audit: type=1800 audit(1585161256.679:29): pid=9870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 88.873585][ T27] audit: type=1800 audit(1585161256.679:30): pid=9870 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.165' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 664.813379][T10027] general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN [ 664.825160][T10027] KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] [ 664.833573][T10027] CPU: 0 PID: 10027 Comm: syz-executor563 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 664.843590][T10027] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 664.853751][T10027] RIP: 0010:destroy_workqueue+0x2e/0x6b0 [ 664.859374][T10027] Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 08 e8 8a 6a 26 00 49 8d be 08 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e0 05 00 00 49 8b 9e 08 01 00 00 48 85 db 74 19 [ 664.879066][T10027] RSP: 0018:ffffc90001f4fcc8 EFLAGS: 00010206 [ 664.885119][T10027] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 664.893251][T10027] RDX: 0000000000000021 RSI: ffffffff814c2af6 RDI: 0000000000000108 [ 664.901237][T10027] RBP: ffff888218b0f8f0 R08: ffff88809383c240 R09: fffffbfff185270a [ 664.909196][T10027] R10: fffffbfff1852709 R11: ffffffff8c29384f R12: ffff888218b0f800 [ 664.917156][T10027] R13: ffff888218b0f804 R14: 0000000000000000 R15: 0000000000004c01 [ 664.925120][T10027] FS: 00000000023d5880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 664.934075][T10027] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 664.940670][T10027] CR2: 00007fdf70fce110 CR3: 00000000987dd000 CR4: 00000000001406f0 [ 664.948631][T10027] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 664.956589][T10027] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 664.964553][T10027] Call Trace: [ 664.967894][T10027] __loop_clr_fd+0x185/0x1280 [ 664.972569][T10027] lo_ioctl+0x2b4/0x1460 [ 664.976804][T10027] ? __loop_clr_fd+0x1280/0x1280 [ 664.981807][T10027] blkdev_ioctl+0x25b/0x660 [ 664.986304][T10027] ? blkdev_common_ioctl+0x1770/0x1770 [ 664.991802][T10027] ? up_read+0x1a8/0x750 [ 664.996071][T10027] block_ioctl+0xe9/0x130 [ 665.000387][T10027] ? blkdev_fallocate+0x3f0/0x3f0 [ 665.005507][T10027] ksys_ioctl+0x11a/0x180 [ 665.009838][T10027] __x64_sys_ioctl+0x6f/0xb0 [ 665.014418][T10027] ? lockdep_hardirqs_on+0x417/0x5d0 [ 665.019728][T10027] do_syscall_64+0xf6/0x790 [ 665.024321][T10027] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 665.030218][T10027] RIP: 0033:0x44a597 [ 665.034111][T10027] Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0d cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 665.053715][T10027] RSP: 002b:00007fffd5bcc468 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 665.062110][T10027] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000044a597 [ 665.070109][T10027] RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003 [ 665.078069][T10027] RBP: 00000000000a2308 R08: 0000000000000000 R09: 000000000000000a [ 665.086040][T10027] R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000407630 [ 665.093995][T10027] R13: 00000000004076c0 R14: 0000000000000000 R15: 0000000000000000 [ 665.101956][T10027] Modules linked in: [ 665.106887][T10027] ---[ end trace 67cd35fb0f40957d ]--- [ 665.112367][T10027] RIP: 0010:destroy_workqueue+0x2e/0x6b0 [ 665.118026][T10027] Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 08 e8 8a 6a 26 00 49 8d be 08 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e0 05 00 00 49 8b 9e 08 01 00 00 48 85 db 74 19 [ 665.137767][T10027] RSP: 0018:ffffc90001f4fcc8 EFLAGS: 00010206 [ 665.143853][T10027] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 665.151827][T10027] RDX: 0000000000000021 RSI: ffffffff814c2af6 RDI: 0000000000000108 [ 665.159866][T10027] RBP: ffff888218b0f8f0 R08: ffff88809383c240 R09: fffffbfff185270a [ 665.167984][T10027] R10: fffffbfff1852709 R11: ffffffff8c29384f R12: ffff888218b0f800 [ 665.176016][T10027] R13: ffff888218b0f804 R14: 0000000000000000 R15: 0000000000004c01 [ 665.184043][T10027] FS: 00000000023d5880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 665.192959][T10027] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 665.199583][T10027] CR2: 00007fdf70fce110 CR3: 00000000987dd000 CR4: 00000000001406f0 [ 665.207593][T10027] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 665.215605][T10027] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 665.223640][T10027] Kernel panic - not syncing: Fatal exception [ 665.230898][T10027] Kernel Offset: disabled [ 665.235376][T10027] Rebooting in 86400 seconds..