[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.412360][ T25] audit: type=1800 audit(1575121378.612:25): pid=8995 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.432537][ T25] audit: type=1800 audit(1575121378.622:26): pid=8995 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.453966][ T25] audit: type=1800 audit(1575121378.622:27): pid=8995 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[ 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 '10.128.15.229' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.596590][ T9148] [EXFAT] trying to mount... [ 68.602179][ T2583] blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 68.614018][ T9148] ------------[ cut here ]------------ [ 68.619935][ T9148] [EXFAT] No bh, device seems wrong or to be ejected. [ 68.627345][ T9148] WARNING: CPU: 1 PID: 9148 at drivers/staging/exfat/exfat_blkdev.c:62 exfat_bdev_read+0x24f/0x2b0 [ 68.638027][ T9148] Kernel panic - not syncing: panic_on_warn set ... [ 68.644833][ T9148] CPU: 1 PID: 9148 Comm: syz-executor326 Not tainted 5.4.0-syzkaller #0 [ 68.653170][ T9148] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.663212][ T9148] Call Trace: [ 68.666488][ T9148] dump_stack+0x197/0x210 [ 68.670801][ T9148] ? exfat_bdev_read+0x1b0/0x2b0 [ 68.675734][ T9148] panic+0x2e3/0x75c [ 68.679621][ T9148] ? add_taint.cold+0x16/0x16 [ 68.684292][ T9148] ? __kasan_check_write+0x14/0x20 [ 68.689403][ T9148] ? __warn.cold+0x14/0x3e [ 68.693818][ T9148] ? __warn+0xd9/0x1cf [ 68.697897][ T9148] ? exfat_bdev_read+0x24f/0x2b0 [ 68.702816][ T9148] __warn.cold+0x2f/0x3e [ 68.707073][ T9148] ? exfat_bdev_read+0x24f/0x2b0 [ 68.712007][ T9148] report_bug+0x289/0x300 [ 68.716327][ T9148] do_error_trap+0x11b/0x200 [ 68.720899][ T9148] do_invalid_op+0x37/0x50 [ 68.725293][ T9148] ? exfat_bdev_read+0x24f/0x2b0 [ 68.730240][ T9148] invalid_op+0x23/0x30 [ 68.734523][ T9148] RIP: 0010:exfat_bdev_read+0x24f/0x2b0 [ 68.740074][ T9148] Code: 00 00 31 ff 41 bc fb ff ff ff 89 de e8 1a 22 9f fb 85 db 0f 85 5d ff ff ff e8 8d 20 9f fb 48 c7 c7 a0 8e a8 88 e8 00 d5 6f fb <0f> 0b e9 45 ff ff ff e8 f5 4d dc fb e9 ad fe ff ff e8 ab 4d dc fb [ 68.759941][ T9148] RSP: 0018:ffff8880a0407aa0 EFLAGS: 00010282 [ 68.766162][ T9148] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 68.774354][ T9148] RDX: 0000000000000000 RSI: ffffffff815e4316 RDI: ffffed1014080f46 [ 68.782805][ T9148] RBP: ffff8880a0407ad8 R08: ffff88808de02380 R09: fffffbfff15d29b2 [ 68.790903][ T9148] R10: fffffbfff15d29b1 R11: ffffffff8ae94d8f R12: 00000000fffffffb [ 68.798868][ T9148] R13: ffff88808fa00000 R14: 0000000000000001 R15: 0000000000000000 [ 68.806842][ T9148] ? vprintk_func+0x86/0x189 [ 68.811416][ T9148] sector_read+0x140/0x1f0 [ 68.815814][ T9148] exfat_fill_super.cold+0x2e4/0x895 [ 68.821082][ T9148] ? exfat_read_root+0x8f0/0x8f0 [ 68.826264][ T9148] ? snprintf+0xbb/0xf0 [ 68.830404][ T9148] ? wait_for_completion+0x440/0x440 [ 68.835669][ T9148] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 68.841381][ T9148] ? set_blocksize+0x2bf/0x340 [ 68.846137][ T9148] mount_bdev+0x304/0x3c0 [ 68.850484][ T9148] ? exfat_read_root+0x8f0/0x8f0 [ 68.855503][ T9148] exfat_fs_mount+0x35/0x40 [ 68.859985][ T9148] ? exfat_remount+0x50/0x50 [ 68.864553][ T9148] legacy_get_tree+0x108/0x220 [ 68.869329][ T9148] vfs_get_tree+0x8e/0x300 [ 68.873761][ T9148] do_mount+0x135a/0x1b50 [ 68.878127][ T9148] ? copy_mount_string+0x40/0x40 [ 68.883107][ T9148] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.889348][ T9148] ? _copy_from_user+0x12c/0x1a0 [ 68.894273][ T9148] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.900552][ T9148] ? copy_mount_options+0x2e8/0x3f0 [ 68.905900][ T9148] ksys_mount+0xdb/0x150 [ 68.910167][ T9148] __x64_sys_mount+0xbe/0x150 [ 68.914844][ T9148] do_syscall_64+0xfa/0x790 [ 68.919344][ T9148] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.925338][ T9148] RIP: 0033:0x440199 [ 68.929610][ T9148] 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 [ 68.949413][ T9148] RSP: 002b:00007ffe6736f358 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 68.957818][ T9148] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440199 [ 68.965774][ T9148] RDX: 0000000020000300 RSI: 00000000200002c0 RDI: 0000000020000280 [ 68.973748][ T9148] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 68.981734][ T9148] R10: 0000000000400000 R11: 0000000000000246 R12: 0000000000401a20 [ 68.990098][ T9148] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 68.999862][ T9148] Kernel Offset: disabled [ 69.004337][ T9148] Rebooting in 86400 seconds..