[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.185531][ T26] audit: type=1800 audit(1574486132.509:25): pid=8753 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.208014][ T26] audit: type=1800 audit(1574486132.519:26): pid=8753 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.229109][ T26] audit: type=1800 audit(1574486132.519:27): pid=8753 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 '10.128.1.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.402080][ T8906] [EXFAT] trying to mount... [ 73.407847][ T2507] block nbd0: Attempted send on invalid socket [ 73.414563][ T2507] blk_update_request: I/O error, dev nbd0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 73.425750][ T8906] ------------[ cut here ]------------ [ 73.431739][ T8906] [EXFAT] No bh, device seems wrong or to be ejected. [ 73.439048][ T8906] WARNING: CPU: 0 PID: 8906 at drivers/staging/exfat/exfat_blkdev.c:62 bdev_read+0x258/0x2b0 [ 73.449195][ T8906] Kernel panic - not syncing: panic_on_warn set ... [ 73.455780][ T8906] CPU: 0 PID: 8906 Comm: syz-executor356 Not tainted 5.4.0-rc8-syzkaller #0 [ 73.464440][ T8906] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.474482][ T8906] Call Trace: [ 73.477789][ T8906] dump_stack+0x197/0x210 [ 73.482117][ T8906] ? bdev_read+0x1a0/0x2b0 [ 73.486524][ T8906] panic+0x2e3/0x75c [ 73.490587][ T8906] ? add_taint.cold+0x16/0x16 [ 73.495250][ T8906] ? __kasan_check_write+0x14/0x20 [ 73.500351][ T8906] ? __warn.cold+0x14/0x35 [ 73.504745][ T8906] ? __warn+0xd9/0x1d0 [ 73.508799][ T8906] ? bdev_read+0x258/0x2b0 [ 73.513194][ T8906] __warn.cold+0x2f/0x35 [ 73.517430][ T8906] ? bdev_read+0x258/0x2b0 [ 73.521830][ T8906] report_bug+0x289/0x300 [ 73.526493][ T8906] do_error_trap+0x11b/0x200 [ 73.531070][ T8906] do_invalid_op+0x37/0x50 [ 73.535496][ T8906] ? bdev_read+0x258/0x2b0 [ 73.539897][ T8906] invalid_op+0x23/0x30 [ 73.544051][ T8906] RIP: 0010:bdev_read+0x258/0x2b0 [ 73.549069][ T8906] Code: ff df 80 3c 02 00 0f 84 51 ff ff ff 4c 89 e7 e8 8e 8d 39 fc e9 44 ff ff ff e8 74 21 fe fb 48 c7 c7 20 20 3d 88 e8 20 54 cf fb <0f> 0b eb 8a e8 6f 8c 39 fc e9 17 fe ff ff e8 a5 8c 39 fc e9 99 fe [ 73.568854][ T8906] RSP: 0018:ffff88808deffad0 EFLAGS: 00010282 [ 73.574908][ T8906] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 73.582862][ T8906] RDX: 0000000000000000 RSI: ffffffff815cf7d6 RDI: ffffed1011bdff4c [ 73.590818][ T8906] RBP: ffff88808deffb10 R08: ffff88808cb88700 R09: ffffed1015d06159 [ 73.598770][ T8906] R10: ffffed1015d06158 R11: ffff8880ae830ac7 R12: 0000000000000000 [ 73.606729][ T8906] R13: ffff88808e480000 R14: 0000000000000001 R15: 0000000000000200 [ 73.614726][ T8906] ? vprintk_func+0x86/0x189 [ 73.619324][ T8906] sector_read+0x156/0x1e0 [ 73.624691][ T8906] exfat_fill_super.cold+0x4d6/0xdba [ 73.629970][ T8906] ? exfat_read_root+0x8d0/0x8d0 [ 73.634989][ T8906] ? vsprintf+0x40/0x40 [ 73.639147][ T8906] ? wait_for_completion+0x440/0x440 [ 73.644416][ T8906] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 73.650134][ T8906] ? set_blocksize+0x2bf/0x340 [ 73.654905][ T8906] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.661153][ T8906] mount_bdev+0x304/0x3c0 [ 73.665477][ T8906] ? exfat_read_root+0x8d0/0x8d0 [ 73.670426][ T8906] exfat_fs_mount+0x35/0x40 [ 73.674922][ T8906] ? exfat_remount+0x50/0x50 [ 73.679498][ T8906] legacy_get_tree+0x108/0x220 [ 73.684261][ T8906] vfs_get_tree+0x8e/0x300 [ 73.688663][ T8906] do_mount+0x1369/0x1b60 [ 73.692974][ T8906] ? copy_mount_string+0x40/0x40 [ 73.697890][ T8906] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 73.704109][ T8906] ? _copy_from_user+0x12c/0x1a0 [ 73.709028][ T8906] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 73.715250][ T8906] ? copy_mount_options+0x2e8/0x3f0 [ 73.720488][ T8906] ksys_mount+0xdb/0x150 [ 73.724722][ T8906] __x64_sys_mount+0xbe/0x150 [ 73.729392][ T8906] do_syscall_64+0xfa/0x760 [ 73.733877][ T8906] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.739757][ T8906] RIP: 0033:0x440179 [ 73.743651][ T8906] 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 [ 73.763238][ T8906] RSP: 002b:00007ffd3d6d2748 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 73.771647][ T8906] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 73.779607][ T8906] RDX: 0000000020000080 RSI: 0000000020000180 RDI: 0000000020000000 [ 73.787562][ T8906] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 73.795515][ T8906] R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000401a00 [ 73.804077][ T8906] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 73.813994][ T8906] Kernel Offset: disabled [ 73.818489][ T8906] Rebooting in 86400 seconds..