[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 69.495333][ T27] audit: type=1800 audit(1576788250.437:25): pid=9183 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 69.521188][ T27] audit: type=1800 audit(1576788250.437:26): pid=9183 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 69.560956][ T27] audit: type=1800 audit(1576788250.437:27): pid=9183 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 78.051919][ T2954] BUG: unable to handle page fault for address: fffff52000680000 [ 78.059696][ T2954] #PF: supervisor read access in kernel mode [ 78.065657][ T2954] #PF: error_code(0x0000) - not-present page [ 78.071615][ T2954] PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a7c34067 PTE 0 [ 78.079074][ T2954] Oops: 0000 [#1] PREEMPT SMP KASAN [ 78.084265][ T2954] CPU: 1 PID: 2954 Comm: kworker/1:2 Not tainted 5.5.0-rc2-syzkaller #0 [ 78.092565][ T2954] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.102610][ T2954] Workqueue: xfs-buf/loop0 xfs_buf_ioend_work [ 78.108666][ T2954] RIP: 0010:xfs_sb_quiet_read_verify+0x47/0xc0 [ 78.114806][ T2954] Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 7f 49 8b 9c 24 30 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 50 8b 1b bf 58 46 53 42 89 de e8 [ 78.134513][ T2954] RSP: 0018:ffffc90007fefcc0 EFLAGS: 00010a06 [ 78.140585][ T2954] RAX: dffffc0000000000 RBX: ffffc90003400000 RCX: ffffffff82ad3c26 [ 78.148886][ T2954] RDX: 1ffff92000680000 RSI: ffffffff82aa0a0f RDI: ffff8880a31f8a70 [ 78.156837][ T2954] RBP: ffffc90007fefcd0 R08: ffff88809ed40440 R09: ffffed1015d2703d [ 78.164803][ T2954] R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: ffff8880a31f8940 [ 78.172766][ T2954] R13: ffff8880a31f895c R14: ffff8880a31f8b74 R15: 0000000000000000 [ 78.180727][ T2954] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 78.189643][ T2954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 78.196237][ T2954] CR2: fffff52000680000 CR3: 00000000a52d8000 CR4: 00000000001406e0 [ 78.204747][ T2954] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 78.212710][ T2954] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 78.220665][ T2954] Call Trace: [ 78.223955][ T2954] xfs_buf_ioend+0x3f9/0xde0 [ 78.228534][ T2954] ? trace_hardirqs_on+0x67/0x240 [ 78.233545][ T2954] xfs_buf_ioend_work+0x19/0x20 [ 78.238378][ T2954] process_one_work+0x9af/0x1740 [ 78.243299][ T2954] ? pwq_dec_nr_in_flight+0x320/0x320 [ 78.248651][ T2954] ? lock_acquire+0x190/0x410 [ 78.253347][ T2954] worker_thread+0x98/0xe40 [ 78.257842][ T2954] ? trace_hardirqs_on+0x67/0x240 [ 78.262859][ T2954] kthread+0x361/0x430 [ 78.266933][ T2954] ? process_one_work+0x1740/0x1740 [ 78.272114][ T2954] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 78.277819][ T2954] ret_from_fork+0x24/0x30 [ 78.282214][ T2954] Modules linked in: [ 78.286087][ T2954] CR2: fffff52000680000 [ 78.290226][ T2954] ---[ end trace 7b5219754f29b3eb ]--- [ 78.295669][ T2954] RIP: 0010:xfs_sb_quiet_read_verify+0x47/0xc0 [ 78.301819][ T2954] Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 7f 49 8b 9c 24 30 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 50 8b 1b bf 58 46 53 42 89 de e8 [ 78.321403][ T2954] RSP: 0018:ffffc90007fefcc0 EFLAGS: 00010a06 [ 78.327459][ T2954] RAX: dffffc0000000000 RBX: ffffc90003400000 RCX: ffffffff82ad3c26 [ 78.335445][ T2954] RDX: 1ffff92000680000 RSI: ffffffff82aa0a0f RDI: ffff8880a31f8a70 [ 78.343417][ T2954] RBP: ffffc90007fefcd0 R08: ffff88809ed40440 R09: ffffed1015d2703d [ 78.351373][ T2954] R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: ffff8880a31f8940 [ 78.359332][ T2954] R13: ffff8880a31f895c R14: ffff8880a31f8b74 R15: 0000000000000000 [ 78.367296][ T2954] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 78.376213][ T2954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 78.382778][ T2954] CR2: fffff52000680000 CR3: 00000000a52d8000 CR4: 00000000001406e0 [ 78.390743][ T2954] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 78.398694][ T2954] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 78.406654][ T2954] Kernel panic - not syncing: Fatal exception [ 78.413972][ T2954] Kernel Offset: disabled [ 78.418298][ T2954] Rebooting in 86400 seconds..