[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 64.278863][ T27] audit: type=1800 audit(1576328664.417:25): pid=8815 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 64.298573][ T27] audit: type=1800 audit(1576328664.417:26): pid=8815 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 64.343200][ T27] audit: type=1800 audit(1576328664.417:27): pid=8815 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 '10.128.0.88' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 82.491948][ T8966] [EXFAT] trying to mount... [ 82.497462][ T2611] blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 82.508850][ T8966] ------------[ cut here ]------------ [ 82.514562][ T8966] [EXFAT] No bh, device seems wrong or to be ejected. [ 82.521639][ T8966] WARNING: CPU: 1 PID: 8966 at drivers/staging/exfat/exfat_blkdev.c:62 exfat_bdev_read+0x24f/0x2b0 [ 82.532335][ T8966] Kernel panic - not syncing: panic_on_warn set ... [ 82.538906][ T8966] CPU: 1 PID: 8966 Comm: syz-executor207 Not tainted 5.5.0-rc1-next-20191213-syzkaller #0 [ 82.548766][ T8966] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.558798][ T8966] Call Trace: [ 82.562073][ T8966] dump_stack+0x197/0x210 [ 82.566384][ T8966] ? exfat_bdev_read+0x240/0x2b0 [ 82.571334][ T8966] panic+0x2e3/0x75c [ 82.575207][ T8966] ? add_taint.cold+0x16/0x16 [ 82.579864][ T8966] ? __kasan_check_write+0x14/0x20 [ 82.584950][ T8966] ? __warn.cold+0x14/0x3e [ 82.589344][ T8966] ? __warn+0xd9/0x1cf [ 82.593396][ T8966] ? exfat_bdev_read+0x24f/0x2b0 [ 82.598310][ T8966] __warn.cold+0x2f/0x3e [ 82.602530][ T8966] ? exfat_bdev_read+0x24f/0x2b0 [ 82.607446][ T8966] report_bug+0x289/0x300 [ 82.611753][ T8966] do_error_trap+0x11b/0x200 [ 82.616332][ T8966] do_invalid_op+0x37/0x50 [ 82.620735][ T8966] ? exfat_bdev_read+0x24f/0x2b0 [ 82.625655][ T8966] invalid_op+0x23/0x30 [ 82.629787][ T8966] RIP: 0010:exfat_bdev_read+0x24f/0x2b0 [ 82.635310][ T8966] Code: 00 00 31 ff 41 bc fb ff ff ff 89 de e8 ba 4f 91 fb 85 db 0f 85 5d ff ff ff e8 2d 4e 91 fb 48 c7 c7 20 93 ca 88 e8 00 de 61 fb <0f> 0b e9 45 ff ff ff e8 05 30 cf fb e9 ad fe ff ff e8 bb 2f cf fb [ 82.654892][ T8966] RSP: 0018:ffffc90001dd7aa0 EFLAGS: 00010282 [ 82.660933][ T8966] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 82.668885][ T8966] RDX: 0000000000000000 RSI: ffffffff815e8b66 RDI: fffff520003baf46 [ 82.676835][ T8966] RBP: ffffc90001dd7ad8 R08: ffff8880a86585c0 R09: ffffed1015d245c9 [ 82.684783][ T8966] R10: ffffed1015d245c8 R11: ffff8880ae922e43 R12: 00000000fffffffb [ 82.692746][ T8966] R13: ffff8880888e0000 R14: 0000000000000001 R15: 0000000000000000 [ 82.700721][ T8966] ? vprintk_func+0x86/0x189 [ 82.705302][ T8966] sector_read+0x140/0x1f0 [ 82.709713][ T8966] exfat_fill_super.cold+0x2e4/0x895 [ 82.714982][ T8966] ? exfat_read_root+0x8f0/0x8f0 [ 82.719895][ T8966] ? snprintf+0xbb/0xf0 [ 82.724033][ T8966] ? wait_for_completion+0x440/0x440 [ 82.729297][ T8966] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 82.735010][ T8966] ? set_blocksize+0x2bf/0x340 [ 82.740213][ T8966] mount_bdev+0x304/0x3c0 [ 82.744523][ T8966] ? exfat_read_root+0x8f0/0x8f0 [ 82.749440][ T8966] exfat_fs_mount+0x35/0x40 [ 82.753921][ T8966] ? exfat_remount+0x50/0x50 [ 82.758490][ T8966] legacy_get_tree+0x108/0x220 [ 82.763236][ T8966] vfs_get_tree+0x8e/0x300 [ 82.767636][ T8966] do_mount+0x135a/0x1b50 [ 82.771960][ T8966] ? copy_mount_string+0x40/0x40 [ 82.776879][ T8966] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 82.783103][ T8966] ? _copy_from_user+0x12c/0x1a0 [ 82.788128][ T8966] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 82.794346][ T8966] ? copy_mount_options+0x2e8/0x3f0 [ 82.799545][ T8966] ksys_mount+0xdb/0x150 [ 82.803769][ T8966] __x64_sys_mount+0xbe/0x150 [ 82.808428][ T8966] do_syscall_64+0xfa/0x790 [ 82.812934][ T8966] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 82.818825][ T8966] RIP: 0033:0x440199 [ 82.822704][ T8966] 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 [ 82.842294][ T8966] RSP: 002b:00007ffdcdd8f378 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 82.850718][ T8966] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440199 [ 82.858681][ T8966] RDX: 0000000020000300 RSI: 00000000200002c0 RDI: 0000000020000280 [ 82.866746][ T8966] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 82.874702][ T8966] R10: 0000000000400000 R11: 0000000000000246 R12: 0000000000401a20 [ 82.882712][ T8966] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 82.892182][ T8966] Kernel Offset: disabled [ 82.896568][ T8966] Rebooting in 86400 seconds..