[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 67.874168][ T26] audit: type=1800 audit(1575936929.893:25): 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 [ 67.906618][ T26] audit: type=1800 audit(1575936929.893:26): 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 [ 67.934353][ T26] audit: type=1800 audit(1575936929.893:27): 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 '10.128.15.227' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 79.859204][ T9149] [EXFAT] trying to mount... [ 79.864592][ T9149] ------------[ cut here ]------------ [ 79.870347][ T9149] [EXFAT] No bh, device seems wrong or to be ejected. [ 79.878394][ T9149] WARNING: CPU: 1 PID: 9149 at drivers/staging/exfat/exfat_blkdev.c:62 exfat_bdev_read+0x24f/0x2b0 [ 79.890458][ T9149] Kernel panic - not syncing: panic_on_warn set ... [ 79.897211][ T9149] CPU: 1 PID: 9149 Comm: syz-executor381 Not tainted 5.5.0-rc1-next-20191209-syzkaller #0 [ 79.907224][ T9149] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.917357][ T9149] Call Trace: [ 79.920663][ T9149] dump_stack+0x197/0x210 [ 79.924991][ T9149] ? exfat_bdev_read+0x150/0x2b0 [ 79.929932][ T9149] panic+0x2e3/0x75c [ 79.933826][ T9149] ? add_taint.cold+0x16/0x16 [ 79.938494][ T9149] ? __kasan_check_write+0x14/0x20 [ 79.943597][ T9149] ? __warn.cold+0x14/0x3e [ 79.948001][ T9149] ? __warn+0xd9/0x1cf [ 79.952055][ T9149] ? exfat_bdev_read+0x24f/0x2b0 [ 79.956978][ T9149] __warn.cold+0x2f/0x3e [ 79.961206][ T9149] ? exfat_bdev_read+0x24f/0x2b0 [ 79.966131][ T9149] report_bug+0x289/0x300 [ 79.970455][ T9149] do_error_trap+0x11b/0x200 [ 79.975029][ T9149] do_invalid_op+0x37/0x50 [ 79.979453][ T9149] ? exfat_bdev_read+0x24f/0x2b0 [ 79.984379][ T9149] invalid_op+0x23/0x30 [ 79.988523][ T9149] RIP: 0010:exfat_bdev_read+0x24f/0x2b0 [ 79.994120][ T9149] Code: 00 00 31 ff 41 bc fb ff ff ff 89 de e8 ea 4d 92 fb 85 db 0f 85 5d ff ff ff e8 5d 4c 92 fb 48 c7 c7 a0 8e ca 88 e8 60 f8 62 fb <0f> 0b e9 45 ff ff ff e8 95 23 d0 fb e9 ad fe ff ff e8 4b 23 d0 fb [ 80.013815][ T9149] RSP: 0018:ffffc90001db7aa0 EFLAGS: 00010282 [ 80.019868][ T9149] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 80.027826][ T9149] RDX: 0000000000000000 RSI: ffffffff815e8576 RDI: fffff520003b6f46 [ 80.035796][ T9149] RBP: ffffc90001db7ad8 R08: ffff88808e680140 R09: ffffed1015d26621 [ 80.044363][ T9149] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: 00000000fffffffb [ 80.052324][ T9149] R13: ffff88808b940000 R14: 0000000000000001 R15: 0000000000000000 [ 80.060322][ T9149] ? vprintk_func+0x86/0x189 [ 80.064906][ T9149] sector_read+0x140/0x1f0 [ 80.069791][ T9149] exfat_fill_super.cold+0x2e4/0x895 [ 80.075101][ T9149] ? exfat_read_root+0x8f0/0x8f0 [ 80.080056][ T9149] ? snprintf+0xbb/0xf0 [ 80.084233][ T9149] ? wait_for_completion+0x440/0x440 [ 80.089681][ T9149] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 80.096183][ T9149] ? set_blocksize+0x2bf/0x340 [ 80.100952][ T9149] mount_bdev+0x304/0x3c0 [ 80.105276][ T9149] ? exfat_read_root+0x8f0/0x8f0 [ 80.110266][ T9149] exfat_fs_mount+0x35/0x40 [ 80.114778][ T9149] ? exfat_remount+0x50/0x50 [ 80.119564][ T9149] legacy_get_tree+0x108/0x220 [ 80.124395][ T9149] vfs_get_tree+0x8e/0x300 [ 80.128952][ T9149] do_mount+0x135a/0x1b50 [ 80.133274][ T9149] ? copy_mount_string+0x40/0x40 [ 80.140049][ T9149] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 80.146377][ T9149] ? _copy_from_user+0x12c/0x1a0 [ 80.151451][ T9149] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 80.158074][ T9149] ? copy_mount_options+0x2e8/0x3f0 [ 80.163658][ T9149] ksys_mount+0xdb/0x150 [ 80.167891][ T9149] __x64_sys_mount+0xbe/0x150 [ 80.172565][ T9149] do_syscall_64+0xfa/0x790 [ 80.177075][ T9149] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 80.182953][ T9149] RIP: 0033:0x440239 [ 80.186833][ T9149] 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 [ 80.207180][ T9149] RSP: 002b:00007ffc43dd47c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 80.215961][ T9149] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440239 [ 80.224097][ T9149] RDX: 0000000020000080 RSI: 0000000020000100 RDI: 0000000020000140 [ 80.232070][ T9149] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 80.240173][ T9149] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ac0 [ 80.248303][ T9149] R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000 [ 80.258164][ T9149] Kernel Offset: disabled [ 80.262583][ T9149] Rebooting in 86400 seconds..