[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.240491][ T26] audit: type=1800 audit(1574483670.389:25): pid=8691 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.269383][ T26] audit: type=1800 audit(1574483670.389:26): pid=8691 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.290167][ T26] audit: type=1800 audit(1574483670.399:27): pid=8691 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 '10.128.0.149' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 75.455728][ T8844] [EXFAT] trying to mount... [ 75.461486][ T2515] block nbd0: Attempted send on invalid socket [ 75.468121][ T2515] blk_update_request: I/O error, dev nbd0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 75.479735][ T8844] ------------[ cut here ]------------ [ 75.485285][ T8844] [EXFAT] No bh, device seems wrong or to be ejected. [ 75.492784][ T8844] WARNING: CPU: 1 PID: 8844 at drivers/staging/exfat/exfat_blkdev.c:62 exfat_bdev_read+0x24f/0x2b0 [ 75.503450][ T8844] Kernel panic - not syncing: panic_on_warn set ... [ 75.510019][ T8844] CPU: 1 PID: 8844 Comm: syz-executor735 Not tainted 5.4.0-rc8-next-20191122-syzkaller #0 [ 75.519892][ T8844] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.529924][ T8844] Call Trace: [ 75.533208][ T8844] dump_stack+0x197/0x210 [ 75.537516][ T8844] ? exfat_bdev_read+0x190/0x2b0 [ 75.542440][ T8844] panic+0x2e3/0x75c [ 75.546339][ T8844] ? add_taint.cold+0x16/0x16 [ 75.551002][ T8844] ? __kasan_check_write+0x14/0x20 [ 75.556262][ T8844] ? __warn.cold+0x14/0x35 [ 75.560662][ T8844] ? __warn+0xd9/0x1d0 [ 75.564712][ T8844] ? exfat_bdev_read+0x24f/0x2b0 [ 75.569639][ T8844] __warn.cold+0x2f/0x35 [ 75.573879][ T8844] ? exfat_bdev_read+0x24f/0x2b0 [ 75.578915][ T8844] report_bug+0x289/0x300 [ 75.583357][ T8844] do_error_trap+0x11b/0x200 [ 75.587935][ T8844] do_invalid_op+0x37/0x50 [ 75.592339][ T8844] ? exfat_bdev_read+0x24f/0x2b0 [ 75.597261][ T8844] invalid_op+0x23/0x30 [ 75.601443][ T8844] RIP: 0010:exfat_bdev_read+0x24f/0x2b0 [ 75.606969][ T8844] Code: 00 00 31 ff 41 bc fb ff ff ff 89 de e8 aa 3e f7 fb 85 db 0f 85 5d ff ff ff e8 1d 3d f7 fb 48 c7 c7 a0 a6 3e 88 e8 89 31 c8 fb <0f> 0b e9 45 ff ff ff e8 25 c9 33 fc e9 ad fe ff ff e8 db c8 33 fc [ 75.626708][ T8844] RSP: 0018:ffff8880a73dfaa0 EFLAGS: 00010282 [ 75.632758][ T8844] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 75.640711][ T8844] RDX: 0000000000000000 RSI: ffffffff815d88c6 RDI: ffffed1014e7bf46 [ 75.648947][ T8844] RBP: ffff8880a73dfad8 R08: ffff8880951821c0 R09: ffffed1015d26621 [ 75.656899][ T8844] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: 00000000fffffffb [ 75.664860][ T8844] R13: ffff88808aea0000 R14: 0000000000000001 R15: 0000000000000000 [ 75.672858][ T8844] ? vprintk_func+0x86/0x189 [ 75.677442][ T8844] sector_read+0x140/0x1f0 [ 75.681844][ T8844] exfat_fill_super.cold+0x2e4/0x895 [ 75.687111][ T8844] ? exfat_read_root+0x8f0/0x8f0 [ 75.692029][ T8844] ? snprintf+0xbb/0xf0 [ 75.696165][ T8844] ? wait_for_completion+0x440/0x440 [ 75.701438][ T8844] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 75.707138][ T8844] ? set_blocksize+0x2bf/0x340 [ 75.711890][ T8844] mount_bdev+0x304/0x3c0 [ 75.716197][ T8844] ? exfat_read_root+0x8f0/0x8f0 [ 75.721114][ T8844] exfat_fs_mount+0x35/0x40 [ 75.725683][ T8844] ? exfat_remount+0x50/0x50 [ 75.730254][ T8844] legacy_get_tree+0x108/0x220 [ 75.734997][ T8844] vfs_get_tree+0x8e/0x300 [ 75.739406][ T8844] do_mount+0x135a/0x1b50 [ 75.743753][ T8844] ? copy_mount_string+0x40/0x40 [ 75.748678][ T8844] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 75.754910][ T8844] ? _copy_from_user+0x12c/0x1a0 [ 75.759834][ T8844] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 75.766052][ T8844] ? copy_mount_options+0x2e8/0x3f0 [ 75.771348][ T8844] ksys_mount+0xdb/0x150 [ 75.775572][ T8844] __x64_sys_mount+0xbe/0x150 [ 75.780231][ T8844] do_syscall_64+0xfa/0x790 [ 75.784714][ T8844] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.790604][ T8844] RIP: 0033:0x440179 [ 75.794494][ T8844] 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 [ 75.814095][ T8844] RSP: 002b:00007ffe8f77ffc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 75.822507][ T8844] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 75.830462][ T8844] RDX: 0000000020000080 RSI: 0000000020000180 RDI: 0000000020000000 [ 75.838429][ T8844] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 75.846388][ T8844] R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000401a00 [ 75.854349][ T8844] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 75.863884][ T8844] Kernel Offset: disabled [ 75.868278][ T8844] Rebooting in 86400 seconds..