[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.900601][ T26] audit: type=1800 audit(1571770867.599:25): pid=8738 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.939833][ T26] audit: type=1800 audit(1571770867.609:26): pid=8738 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 64.001478][ T26] audit: type=1800 audit(1571770867.609:27): pid=8738 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 '10.128.1.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 75.979831][ T8892] [EXFAT] trying to mount... [ 75.985221][ T2500] blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 75.996446][ T8892] ------------[ cut here ]------------ [ 76.001908][ T8892] [EXFAT] No bh, device seems wrong or to be ejected. [ 76.009651][ T8892] WARNING: CPU: 1 PID: 8892 at drivers/staging/exfat/exfat_blkdev.c:62 bdev_read+0x258/0x2b0 [ 76.020110][ T8892] Kernel panic - not syncing: panic_on_warn set ... [ 76.026689][ T8892] CPU: 1 PID: 8892 Comm: syz-executor041 Not tainted 5.4.0-rc4+ #0 [ 76.034566][ T8892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.044971][ T8892] Call Trace: [ 76.048270][ T8892] dump_stack+0x172/0x1f0 [ 76.052706][ T8892] ? bdev_read+0x170/0x2b0 [ 76.057392][ T8892] panic+0x2e3/0x75c [ 76.061318][ T8892] ? add_taint.cold+0x16/0x16 [ 76.066014][ T8892] ? __kasan_check_write+0x14/0x20 [ 76.071130][ T8892] ? __warn.cold+0x14/0x35 [ 76.075557][ T8892] ? __warn+0xd9/0x1d0 [ 76.079799][ T8892] ? bdev_read+0x258/0x2b0 [ 76.084218][ T8892] __warn.cold+0x2f/0x35 [ 76.088446][ T8892] ? bdev_read+0x258/0x2b0 [ 76.093014][ T8892] report_bug+0x289/0x300 [ 76.097438][ T8892] do_error_trap+0x11b/0x200 [ 76.102050][ T8892] do_invalid_op+0x37/0x50 [ 76.106574][ T8892] ? bdev_read+0x258/0x2b0 [ 76.110990][ T8892] invalid_op+0x23/0x30 [ 76.115145][ T8892] RIP: 0010:bdev_read+0x258/0x2b0 [ 76.120166][ T8892] Code: ff df 80 3c 02 00 0f 84 51 ff ff ff 4c 89 e7 e8 ce e7 39 fc e9 44 ff ff ff e8 64 88 fe fb 48 c7 c7 20 0b 3d 88 e8 e0 ca cf fb <0f> 0b eb 8a e8 af e6 39 fc e9 17 fe ff ff e8 e5 e6 39 fc e9 99 fe [ 76.139932][ T8892] RSP: 0018:ffff88809069fad0 EFLAGS: 00010282 [ 76.145987][ T8892] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 76.154045][ T8892] RDX: 0000000000000000 RSI: ffffffff815cb646 RDI: ffffed10120d3f4c [ 76.162092][ T8892] RBP: ffff88809069fb10 R08: ffff888094d5e540 R09: ffffed1015d26159 [ 76.170158][ T8892] R10: ffffed1015d26158 R11: ffff8880ae930ac7 R12: 0000000000000000 [ 76.178120][ T8892] R13: ffff888091200000 R14: 0000000000000001 R15: 0000000000000200 [ 76.186115][ T8892] ? vprintk_func+0x86/0x189 [ 76.190751][ T8892] sector_read+0x156/0x1e0 [ 76.195200][ T8892] exfat_fill_super.cold+0x4d6/0xdba [ 76.200512][ T8892] ? exfat_read_root+0x8d0/0x8d0 [ 76.205572][ T8892] ? vsprintf+0x40/0x40 [ 76.209727][ T8892] ? wait_for_completion+0x440/0x440 [ 76.215041][ T8892] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 76.221027][ T8892] ? set_blocksize+0x2bf/0x340 [ 76.227196][ T8892] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.233535][ T8892] mount_bdev+0x304/0x3c0 [ 76.237851][ T8892] ? exfat_read_root+0x8d0/0x8d0 [ 76.242782][ T8892] exfat_fs_mount+0x35/0x40 [ 76.247415][ T8892] ? exfat_remount+0x50/0x50 [ 76.252610][ T8892] legacy_get_tree+0x108/0x220 [ 76.257455][ T8892] vfs_get_tree+0x8e/0x300 [ 76.261898][ T8892] do_mount+0x143d/0x1d10 [ 76.266688][ T8892] ? copy_mount_string+0x40/0x40 [ 76.271635][ T8892] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.278227][ T8892] ? _copy_from_user+0x12c/0x1a0 [ 76.283263][ T8892] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.289505][ T8892] ? copy_mount_options+0x2e8/0x3f0 [ 76.294714][ T8892] ksys_mount+0xdb/0x150 [ 76.298944][ T8892] __x64_sys_mount+0xbe/0x150 [ 76.303652][ T8892] do_syscall_64+0xfa/0x760 [ 76.308228][ T8892] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.314203][ T8892] RIP: 0033:0x440179 [ 76.318101][ T8892] 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 [ 76.337709][ T8892] RSP: 002b:00007ffc3fd81bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 76.346299][ T8892] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 76.354386][ T8892] RDX: 0000000020000200 RSI: 00000000200001c0 RDI: 0000000020000400 [ 76.362369][ T8892] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 76.370332][ T8892] R10: 0000000002800001 R11: 0000000000000246 R12: 0000000000401a00 [ 76.378304][ T8892] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 76.387848][ T8892] Kernel Offset: disabled [ 76.392272][ T8892] Rebooting in 86400 seconds..