[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.631136] audit: type=1800 audit(1547759239.326:25): pid=7819 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.664315] audit: type=1800 audit(1547759239.326:26): pid=7819 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.692664] audit: type=1800 audit(1547759239.336:27): pid=7819 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 '10.128.0.93' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.439942] kasan: CONFIG_KASAN_INLINE enabled [ 50.444641] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 50.452117] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 50.458353] CPU: 0 PID: 7970 Comm: syz-executor544 Not tainted 5.0.0-rc2+ #29 [ 50.465603] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.474945] RIP: 0010:fuse_dev_do_write+0x1e44/0x3780 [ 50.480127] Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 d5 18 00 00 49 8b 9f 58 01 00 00 b8 ff ff 37 00 48 c1 e0 2a 48 8d 7b 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 39 [ 50.499025] RSP: 0018:ffff8880a53776d8 EFLAGS: 00010247 [ 50.504364] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff828b9c2a [ 50.511632] RDX: 0000000000000000 RSI: ffffffff828b9c3c RDI: 0000000000000004 [ 50.518881] RBP: ffff8880a5377aa8 R08: ffff888090cb0600 R09: ffffed10126fef7f [ 50.526143] R10: ffffed10126fef7e R11: ffff8880937f7bf3 R12: 0000000000000000 [ 50.533393] R13: 0000000000000000 R14: 0000000000000030 R15: ffff8880937f7bd0 [ 50.540645] FS: 000000000097b880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 50.548849] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.554709] CR2: 0000000000455060 CR3: 0000000093979000 CR4: 00000000001406f0 [ 50.561965] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.569223] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.576466] Call Trace: [ 50.579045] ? fuse_dev_read+0x250/0x250 [ 50.583085] ? fuse_dev_do_read.isra.0+0x27a/0x1c90 [ 50.588094] ? print_usage_bug+0xd0/0xd0 [ 50.592136] ? fuse_dev_release+0x6b0/0x6b0 [ 50.596449] ? add_lock_to_list.isra.0+0x450/0x450 [ 50.601360] ? print_usage_bug+0xd0/0xd0 [ 50.605403] ? aa_file_perm+0x42e/0x1090 [ 50.609446] ? find_held_lock+0x35/0x120 [ 50.613488] ? aa_file_perm+0x42e/0x1090 [ 50.617533] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.623049] ? lock_downgrade+0x910/0x910 [ 50.627174] ? kasan_check_read+0x11/0x20 [ 50.631302] ? rcu_read_unlock_special+0x380/0x380 [ 50.636217] ? aa_file_perm+0x455/0x1090 [ 50.640259] ? memset+0x32/0x40 [ 50.643518] fuse_dev_write+0x191/0x240 [ 50.647481] ? fuse_dev_splice_write+0xe10/0xe10 [ 50.652227] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.657746] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.663260] ? iov_iter_init+0xea/0x220 [ 50.667221] __vfs_write+0x764/0xb40 [ 50.670936] ? kernel_read+0x120/0x120 [ 50.674889] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.680420] ? apparmor_file_permission+0x25/0x30 [ 50.685243] ? rw_verify_area+0x118/0x360 [ 50.689372] vfs_write+0x20c/0x580 [ 50.692890] ksys_write+0x105/0x260 [ 50.696495] ? __ia32_sys_read+0xb0/0xb0 [ 50.700553] ? trace_hardirqs_off_caller+0x300/0x300 [ 50.705637] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.710374] __x64_sys_write+0x73/0xb0 [ 50.714243] do_syscall_64+0x1a3/0x800 [ 50.718110] ? syscall_return_slowpath+0x5f0/0x5f0 [ 50.723033] ? prepare_exit_to_usermode+0x232/0x3b0 [ 50.728044] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.732871] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.738036] RIP: 0033:0x440279 [ 50.741207] 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 [ 50.760091] RSP: 002b:00007fff4558feb8 EFLAGS: 00000217 ORIG_RAX: 0000000000000001 [ 50.767778] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279 [ 50.775023] RDX: 0000000000000030 RSI: 0000000020000080 RDI: 0000000000000003 [ 50.782301] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 50.789551] R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401b00 [ 50.796814] R13: 0000000000401b90 R14: 0000000000000000 R15: 0000000000000000 [ 50.804062] Modules linked in: [ 50.808190] ---[ end trace 1509a8d7cc0eb78a ]--- [ 50.812982] RIP: 0010:fuse_dev_do_write+0x1e44/0x3780 [ 50.818231] Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 d5 18 00 00 49 8b 9f 58 01 00 00 b8 ff ff 37 00 48 c1 e0 2a 48 8d 7b 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 39 [ 50.837172] RSP: 0018:ffff8880a53776d8 EFLAGS: 00010247 [ 50.842544] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff828b9c2a [ 50.849828] RDX: 0000000000000000 RSI: ffffffff828b9c3c RDI: 0000000000000004 [ 50.857110] RBP: ffff8880a5377aa8 R08: ffff888090cb0600 R09: ffffed10126fef7f [ 50.864359] R10: ffffed10126fef7e R11: ffff8880937f7bf3 R12: 0000000000000000 [ 50.871658] R13: 0000000000000000 R14: 0000000000000030 R15: ffff8880937f7bd0 [ 50.878940] FS: 000000000097b880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 50.887181] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.893065] CR2: ffffffffff600400 CR3: 0000000093979000 CR4: 00000000001406f0 [ 50.900385] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.907685] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.914934] Kernel panic - not syncing: Fatal exception [ 50.921206] Kernel Offset: disabled [ 50.924838] Rebooting in 86400 seconds..