[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 44.767495][ T25] audit: type=1800 audit(1575169420.680:25): pid=8042 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 44.805205][ T25] audit: type=1800 audit(1575169420.680:26): pid=8042 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 44.844144][ T25] audit: type=1800 audit(1575169420.680:27): pid=8042 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 54.911529][ T8191] [EXFAT] trying to mount... [ 54.917409][ T2582] blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 54.928742][ T8191] ------------[ cut here ]------------ [ 54.934407][ T8191] [EXFAT] No bh, device seems wrong or to be ejected. [ 54.941876][ T8191] WARNING: CPU: 0 PID: 8191 at drivers/staging/exfat/exfat_blkdev.c:63 exfat_bdev_read+0x1ef/0x250 [ 54.952560][ T8191] Kernel panic - not syncing: panic_on_warn set ... [ 54.959258][ T8191] CPU: 0 PID: 8191 Comm: syz-executor144 Not tainted 5.4.0-syzkaller #0 [ 54.967602][ T8191] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.977662][ T8191] Call Trace: [ 54.980954][ T8191] dump_stack+0x1fb/0x318 [ 54.985268][ T8191] panic+0x264/0x7a9 [ 54.989227][ T8191] ? __warn+0x105/0x210 [ 54.993433][ T8191] ? exfat_bdev_read+0x1ef/0x250 [ 54.998566][ T8191] __warn+0x20e/0x210 [ 55.002694][ T8191] ? exfat_bdev_read+0x1ef/0x250 [ 55.007645][ T8191] report_bug+0x1b6/0x2f0 [ 55.012058][ T8191] ? exfat_bdev_read+0x1ef/0x250 [ 55.016983][ T8191] do_error_trap+0xd7/0x440 [ 55.021466][ T8191] do_invalid_op+0x36/0x40 [ 55.025859][ T8191] ? exfat_bdev_read+0x1ef/0x250 [ 55.030776][ T8191] invalid_op+0x23/0x30 [ 55.035268][ T8191] RIP: 0010:exfat_bdev_read+0x1ef/0x250 [ 55.040882][ T8191] Code: 0a 75 fb b8 fb ff ff ff 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 9f 0a 75 fb 48 c7 c7 4e 08 da 88 31 c0 e8 e1 23 47 fb <0f> 0b eb d5 89 d9 80 e1 07 38 c1 0f 8c 75 fe ff ff 48 89 df e8 88 [ 55.060612][ T8191] RSP: 0018:ffff8880934877b0 EFLAGS: 00010246 [ 55.066715][ T8191] RAX: 9a744eb0cacc2500 RBX: 0000000000000000 RCX: ffff888097658440 [ 55.074672][ T8191] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 55.082643][ T8191] RBP: ffff8880934877f0 R08: ffffffff815fa274 R09: ffffed1015d465d8 [ 55.090594][ T8191] R10: ffffed1015d465d8 R11: 0000000000000000 R12: ffff88808efa0094 [ 55.098542][ T8191] R13: ffff88808efa81a4 R14: ffff888093487950 R15: 1ffff11012690f2a [ 55.106507][ T8191] ? vprintk_emit+0x2d4/0x3a0 [ 55.111166][ T8191] sector_read+0x120/0x320 [ 55.115561][ T8191] exfat_fill_super+0x107e/0x23f0 [ 55.120563][ T8191] ? mark_lock+0x107/0x1650 [ 55.125061][ T8191] ? mark_lock+0x107/0x1650 [ 55.129545][ T8191] ? __lock_acquire+0xc75/0x1be0 [ 55.134459][ T8191] ? widen_string+0x40/0x390 [ 55.139065][ T8191] ? string+0x2c7/0x2e0 [ 55.143198][ T8191] ? bdev_name+0x2a6/0x3b0 [ 55.147588][ T8191] ? pointer+0x223/0x7a0 [ 55.151807][ T8191] ? vsnprintf+0x1b6e/0x1c00 [ 55.156372][ T8191] ? snprintf+0x6f/0x90 [ 55.160499][ T8191] ? __kasan_check_write+0x14/0x20 [ 55.165579][ T8191] ? set_blocksize+0x15d/0x3a0 [ 55.170311][ T8191] ? sb_set_blocksize+0xb7/0xf0 [ 55.175135][ T8191] mount_bdev+0x27c/0x390 [ 55.179438][ T8191] ? exfat_fs_mount+0x40/0x40 [ 55.184084][ T8191] exfat_fs_mount+0x34/0x40 [ 55.188559][ T8191] legacy_get_tree+0xf9/0x1a0 [ 55.193207][ T8191] ? tm_current+0x550/0x550 [ 55.197683][ T8191] vfs_get_tree+0x8b/0x2a0 [ 55.202089][ T8191] do_mount+0x16bb/0x24f0 [ 55.206394][ T8191] ? copy_mount_options+0xdc/0x3c0 [ 55.211521][ T8191] ksys_mount+0xcc/0x100 [ 55.215752][ T8191] __x64_sys_mount+0xbf/0xd0 [ 55.220332][ T8191] do_syscall_64+0xf7/0x1c0 [ 55.224816][ T8191] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.230689][ T8191] RIP: 0033:0x440199 [ 55.234559][ T8191] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 55.254427][ T8191] RSP: 002b:00007ffcbe12a9d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 55.262829][ T8191] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440199 [ 55.270803][ T8191] RDX: 0000000020000300 RSI: 00000000200002c0 RDI: 0000000020000280 [ 55.278759][ T8191] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 55.287345][ T8191] R10: 0000000000400000 R11: 0000000000000246 R12: 0000000000401a20 [ 55.295308][ T8191] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 55.304626][ T8191] Kernel Offset: disabled [ 55.309005][ T8191] Rebooting in 86400 seconds..