[ 34.128345] audit: type=1800 audit(1538480382.071:24): pid=5905 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2454 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.602346] audit: type=1800 audit(1538480382.621:25): pid=5905 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 34.627935] audit: type=1800 audit(1538480382.621:26): pid=5905 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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 '10.128.0.124' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.325202] kasan: CONFIG_KASAN_INLINE enabled [ 45.329818] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 45.337197] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.343434] CPU: 0 PID: 6059 Comm: syz-executor343 Not tainted 4.19.0-rc6-next-20181002+ #85 [ 45.352000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.361347] RIP: 0010:fuse_dev_do_write+0x1dc2/0x3810 [ 45.366538] Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 dc 17 00 00 49 8b 9d 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 82 [ 45.385423] RSP: 0018:ffff8801bb6ff4b8 EFLAGS: 00010247 [ 45.390765] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8287fbc1 [ 45.398020] RDX: 0000000000000000 RSI: ffffffff8287fbd3 RDI: 0000000000000004 [ 45.405270] RBP: ffff8801bb6ffa50 R08: ffff8801bb5d4500 R09: ffffed003a915b7e [ 45.412525] R10: ffffed003a915b7e R11: ffff8801d48adbf3 R12: 0000000000000000 [ 45.419796] R13: ffff8801d48adbd0 R14: 0000000000000000 R15: 0000000000000030 [ 45.427049] FS: 0000000002337880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 45.435253] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.441113] CR2: 0000000000455080 CR3: 00000001d3b53000 CR4: 00000000001406f0 [ 45.448365] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.455634] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.462879] Call Trace: [ 45.465449] ? fuse_put_request+0x459/0x6a0 [ 45.469752] ? fuse_dev_do_read.isra.29+0x1452/0x19d0 [ 45.474928] ? fuse_dev_read+0x250/0x250 [ 45.478973] ? mark_held_locks+0x130/0x130 [ 45.483188] ? kasan_check_write+0x14/0x20 [ 45.487405] ? do_raw_spin_lock+0xc1/0x200 [ 45.491623] ? fuse_dev_do_read.isra.29+0x2fc/0x19d0 [ 45.496711] ? mark_held_locks+0x130/0x130 [ 45.500930] ? is_bpf_text_address+0xac/0x170 [ 45.505408] ? mark_held_locks+0x130/0x130 [ 45.509622] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 45.514556] ? kasan_check_read+0x11/0x20 [ 45.518685] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 45.523944] ? rcu_softirq_qs+0x20/0x20 [ 45.527896] ? unwind_dump+0x190/0x190 [ 45.531772] ? aa_file_perm+0x469/0x1060 [ 45.535824] ? lock_downgrade+0x900/0x900 [ 45.539953] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 45.544866] ? lock_downgrade+0x900/0x900 [ 45.549001] ? aa_file_perm+0x490/0x1060 [ 45.553039] ? rcu_softirq_qs+0x20/0x20 [ 45.557016] ? memset+0x31/0x40 [ 45.560281] fuse_dev_write+0x19a/0x240 [ 45.564241] ? fuse_dev_splice_write+0xe70/0xe70 [ 45.568994] ? __save_stack_trace+0x8d/0xf0 [ 45.573319] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.578840] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.584360] ? iov_iter_init+0xc2/0x1e0 [ 45.588315] __vfs_write+0x6b8/0x9f0 [ 45.592012] ? kernel_read+0x120/0x120 [ 45.595883] ? apparmor_path_rmdir+0x30/0x30 [ 45.600272] ? trace_hardirqs_on+0x310/0x310 [ 45.604688] ? apparmor_file_permission+0x24/0x30 [ 45.609536] ? rw_verify_area+0x118/0x360 [ 45.613670] vfs_write+0x1fc/0x560 [ 45.617193] ksys_write+0x101/0x260 [ 45.620800] ? __ia32_sys_read+0xb0/0xb0 [ 45.624863] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 45.630297] ? ksys_mount+0xa8/0x140 [ 45.633994] __x64_sys_write+0x73/0xb0 [ 45.637864] do_syscall_64+0x1b9/0x820 [ 45.641732] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 45.647075] ? syscall_return_slowpath+0x5e0/0x5e0 [ 45.651984] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.656813] ? trace_hardirqs_on_caller+0x310/0x310 [ 45.661812] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 45.666812] ? prepare_exit_to_usermode+0x291/0x3b0 [ 45.671813] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.676639] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.681810] RIP: 0033:0x440299 [ 45.684986] 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 [ 45.704844] RSP: 002b:00007ffef8f938a8 EFLAGS: 00000213 ORIG_RAX: 0000000000000001 [ 45.712540] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 45.719813] RDX: 0000000000000030 RSI: 0000000020000080 RDI: 0000000000000003 [ 45.727065] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 45.734317] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401b20 [ 45.741567] R13: 0000000000401bb0 R14: 0000000000000000 R15: 0000000000000000 [ 45.748823] Modules linked in: [ 45.752594] ---[ end trace 6ca075609cbc5a19 ]--- [ 45.757399] RIP: 0010:fuse_dev_do_write+0x1dc2/0x3810 [ 45.762588] Code: 00 48 c1 e0 2a 80 3c 02 00 0f 85 dc 17 00 00 49 8b 9d 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 82 [ 45.781621] RSP: 0018:ffff8801bb6ff4b8 EFLAGS: 00010247 [ 45.787017] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8287fbc1 [ 45.794326] RDX: 0000000000000000 RSI: ffffffff8287fbd3 RDI: 0000000000000004 [ 45.801583] RBP: ffff8801bb6ffa50 R08: ffff8801bb5d4500 R09: ffffed003a915b7e [ 45.808863] R10: ffffed003a915b7e R11: ffff8801d48adbf3 R12: 0000000000000000 [ 45.816147] R13: ffff8801d48adbd0 R14: 0000000000000000 R15: 0000000000000030 [ 45.823441] FS: 0000000002337880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 45.831669] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.837589] CR2: 0000000000455080 CR3: 00000001d3b53000 CR4: 00000000001406f0 [ 45.844877] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.852132] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.859417] Kernel panic - not syncing: Fatal exception [ 45.865748] Kernel Offset: disabled [ 45.869380] Rebooting in 86400 seconds..