[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.737676] audit: type=1800 audit(1547765622.629:25): pid=7826 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.757603] audit: type=1800 audit(1547765622.629:26): pid=7826 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.792985] audit: type=1800 audit(1547765622.629:27): pid=7826 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.98' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 66.063404] kasan: CONFIG_KASAN_INLINE enabled [ 66.068293] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 66.075700] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 66.082033] CPU: 0 PID: 7976 Comm: syz-executor856 Not tainted 5.0.0-rc2+ #30 [ 66.089288] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.098757] RIP: 0010:fuse_dev_do_write+0x1e44/0x3780 [ 66.103930] 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 [ 66.122813] RSP: 0018:ffff88808b0276d8 EFLAGS: 00010247 [ 66.128208] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff828b9c2a [ 66.135566] RDX: 0000000000000000 RSI: ffffffff828b9c3c RDI: 0000000000000004 [ 66.142818] RBP: ffff88808b027aa8 R08: ffff88808d2d4180 R09: ffffed101327617f [ 66.150133] R10: ffffed101327617e R11: ffff8880993b0bf3 R12: 0000000000000000 [ 66.157389] R13: 0000000000000000 R14: 0000000000000030 R15: ffff8880993b0bd0 [ 66.164646] FS: 00000000020c5880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 66.172861] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.178726] CR2: 0000000000455060 CR3: 00000000925d8000 CR4: 00000000001406f0 [ 66.185981] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 66.193234] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 66.200485] Call Trace: [ 66.203061] ? fuse_request_free+0x80/0x80 [ 66.207403] ? fuse_dev_read+0x250/0x250 [ 66.211458] ? fuse_dev_do_read.isra.0+0x27a/0x1c90 [ 66.216457] ? print_usage_bug+0xd0/0xd0 [ 66.220537] ? fuse_dev_release+0x6b0/0x6b0 [ 66.224850] ? add_lock_to_list.isra.0+0x450/0x450 [ 66.229774] ? print_usage_bug+0xd0/0xd0 [ 66.233826] ? is_bpf_text_address+0xac/0x170 [ 66.238305] ? find_held_lock+0x35/0x120 [ 66.242349] ? is_bpf_text_address+0xac/0x170 [ 66.246934] ? lock_downgrade+0x910/0x910 [ 66.251064] ? kasan_check_read+0x11/0x20 [ 66.255207] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 66.260465] ? rcu_read_unlock_special+0x380/0x380 [ 66.265382] ? memset+0x32/0x40 [ 66.268644] fuse_dev_write+0x191/0x240 [ 66.272601] ? fuse_dev_splice_write+0xe10/0xe10 [ 66.277443] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.282985] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 66.288606] ? iov_iter_init+0xea/0x220 [ 66.292583] __vfs_write+0x764/0xb40 [ 66.296288] ? kernel_read+0x120/0x120 [ 66.300160] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.305690] ? rw_verify_area+0x118/0x360 [ 66.309821] vfs_write+0x20c/0x580 [ 66.313345] ksys_write+0x105/0x260 [ 66.316954] ? __ia32_sys_read+0xb0/0xb0 [ 66.320998] ? trace_hardirqs_off_caller+0x300/0x300 [ 66.326084] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 66.330946] __x64_sys_write+0x73/0xb0 [ 66.334822] do_syscall_64+0x1a3/0x800 [ 66.338696] ? syscall_return_slowpath+0x5f0/0x5f0 [ 66.343606] ? prepare_exit_to_usermode+0x232/0x3b0 [ 66.348608] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 66.353434] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.358604] RIP: 0033:0x440279 [ 66.361780] 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 [ 66.380661] RSP: 002b:00007ffc8d535288 EFLAGS: 00000217 ORIG_RAX: 0000000000000001 [ 66.388351] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279 [ 66.395709] RDX: 0000000000000030 RSI: 0000000020000080 RDI: 0000000000000003 [ 66.402962] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 66.410213] R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401b00 [ 66.417467] R13: 0000000000401b90 R14: 0000000000000000 R15: 0000000000000000 [ 66.424726] Modules linked in: [ 66.428256] ---[ end trace f0ac3e25ad2661db ]--- [ 66.433028] RIP: 0010:fuse_dev_do_write+0x1e44/0x3780 [ 66.438370] 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 [ 66.457432] RSP: 0018:ffff88808b0276d8 EFLAGS: 00010247 [ 66.462801] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff828b9c2a [ 66.470198] RDX: 0000000000000000 RSI: ffffffff828b9c3c RDI: 0000000000000004 [ 66.477495] RBP: ffff88808b027aa8 R08: ffff88808d2d4180 R09: ffffed101327617f [ 66.484974] R10: ffffed101327617e R11: ffff8880993b0bf3 R12: 0000000000000000 [ 66.492265] R13: 0000000000000000 R14: 0000000000000030 R15: ffff8880993b0bd0 [ 66.499554] FS: 00000000020c5880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 66.507925] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.513801] CR2: 0000000000455060 CR3: 00000000925d8000 CR4: 00000000001406f0 [ 66.521092] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 66.528488] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 66.535772] Kernel panic - not syncing: Fatal exception [ 66.542234] Kernel Offset: disabled [ 66.545859] Rebooting in 86400 seconds..