[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.069568] audit: type=1800 audit(1547765888.145:25): pid=7951 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 41.099035] audit: type=1800 audit(1547765888.145:26): pid=7951 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 41.122728] audit: type=1800 audit(1547765888.155:27): pid=7951 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 '10.128.0.187' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.908535] kasan: CONFIG_KASAN_INLINE enabled [ 53.913277] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 53.920718] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.926952] CPU: 0 PID: 8102 Comm: syz-executor055 Not tainted 5.0.0-rc2+ #30 [ 53.934212] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.943598] RIP: 0010:fuse_dev_do_write+0x1e44/0x3780 [ 53.948786] 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 [ 53.967674] RSP: 0018:ffff8880a4c5f6a8 EFLAGS: 00010247 [ 53.973021] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff828b9c2a [ 53.980280] RDX: 0000000000000000 RSI: ffffffff828b9c3c RDI: 0000000000000004 [ 53.987530] RBP: ffff8880a4c5fa78 R08: ffff8880a9356340 R09: ffffed10129a937f [ 53.994785] R10: ffffed10129a937e R11: ffff888094d49bf3 R12: 0000000000000000 [ 54.002035] R13: 0000000000000000 R14: 0000000000000030 R15: ffff888094d49bd0 [ 54.009286] FS: 0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:000000000910f840 [ 54.017491] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 54.023352] CR2: 0000000020000000 CR3: 00000000a46dd000 CR4: 00000000001406f0 [ 54.030602] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.037862] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.045109] Call Trace: [ 54.047686] ? fuse_dev_read+0x250/0x250 [ 54.051734] ? fuse_dev_do_read.isra.0+0x27a/0x1c90 [ 54.056753] ? __lock_acquire+0x572/0x4a30 [ 54.060976] ? print_usage_bug+0xd0/0xd0 [ 54.065022] ? fuse_dev_release+0x6b0/0x6b0 [ 54.069323] ? add_lock_to_list.isra.0+0x450/0x450 [ 54.074254] ? mark_held_locks+0x100/0x100 [ 54.078490] ? aa_file_perm+0x42e/0x1090 [ 54.082531] ? find_held_lock+0x35/0x120 [ 54.086572] ? aa_file_perm+0x42e/0x1090 [ 54.090615] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.096137] ? lock_downgrade+0x910/0x910 [ 54.100270] ? kasan_check_read+0x11/0x20 [ 54.104412] ? rcu_read_unlock_special+0x380/0x380 [ 54.109324] ? aa_file_perm+0x455/0x1090 [ 54.113377] ? memset+0x32/0x40 [ 54.116642] fuse_dev_write+0x191/0x240 [ 54.120606] ? fuse_dev_splice_write+0xe10/0xe10 [ 54.125348] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.130865] ? save_stack+0xa9/0xd0 [ 54.134475] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 54.139999] ? iov_iter_init+0xea/0x220 [ 54.143953] __vfs_write+0x764/0xb40 [ 54.147657] ? kernel_read+0x120/0x120 [ 54.151526] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.157066] ? apparmor_file_permission+0x25/0x30 [ 54.161901] ? rw_verify_area+0x118/0x360 [ 54.166032] vfs_write+0x20c/0x580 [ 54.169555] ksys_write+0x105/0x260 [ 54.173163] ? __ia32_sys_read+0xb0/0xb0 [ 54.177208] ? __ia32_compat_sys_mount+0x689/0x790 [ 54.182119] ? trace_hardirqs_off_caller+0x300/0x300 [ 54.187205] __ia32_sys_write+0x71/0xb0 [ 54.191165] do_fast_syscall_32+0x333/0xf98 [ 54.195472] ? do_int80_syscall_32+0x880/0x880 [ 54.200042] ? trace_hardirqs_off+0x310/0x310 [ 54.204518] ? syscall_return_slowpath+0x5f0/0x5f0 [ 54.209430] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.214949] ? prepare_exit_to_usermode+0x232/0x3b0 [ 54.220565] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.225399] entry_SYSENTER_compat+0x70/0x7f [ 54.229791] RIP: 0023:0xf7f07869 [ 54.233136] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 54.252018] RSP: 002b:00000000ff94bb0c EFLAGS: 00000282 ORIG_RAX: 0000000000000004 [ 54.259708] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000080 [ 54.266959] RDX: 0000000000000030 RSI: 00000000080ea078 RDI: 00000000ff94bb60 [ 54.274214] RBP: 0000000000001000 R08: 0000000000000000 R09: 0000000000000000 [ 54.281486] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 54.288742] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 54.296001] Modules linked in: [ 54.299691] ---[ end trace 9205d3edadc56789 ]--- [ 54.304455] RIP: 0010:fuse_dev_do_write+0x1e44/0x3780 [ 54.309681] 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 [ 54.328828] RSP: 0018:ffff8880a4c5f6a8 EFLAGS: 00010247 [ 54.334180] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff828b9c2a [ 54.341487] RDX: 0000000000000000 RSI: ffffffff828b9c3c RDI: 0000000000000004 [ 54.349048] RBP: ffff8880a4c5fa78 R08: ffff8880a9356340 R09: ffffed10129a937f [ 54.356362] R10: ffffed10129a937e R11: ffff888094d49bf3 R12: 0000000000000000 [ 54.363650] R13: 0000000000000000 R14: 0000000000000030 R15: ffff888094d49bd0 [ 54.370962] FS: 0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:000000000910f840 [ 54.379284] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 54.385149] CR2: 0000000020000000 CR3: 00000000a46dd000 CR4: 00000000001406f0 [ 54.392472] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.399763] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.407054] Kernel panic - not syncing: Fatal exception [ 54.413343] Kernel Offset: disabled [ 54.416968] Rebooting in 86400 seconds..