[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 26.736341] kauditd_printk_skb: 8 callbacks suppressed [ 26.736353] audit: type=1800 audit(1538118943.480:29): pid=5247 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 26.763665] audit: type=1800 audit(1538118943.480:30): pid=5247 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.68' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.863515] kasan: CONFIG_KASAN_INLINE enabled [ 38.868227] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.875580] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.881795] CPU: 0 PID: 5403 Comm: syz-executor736 Not tainted 4.19.0-rc5+ #234 [ 38.889216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.898557] RIP: 0010:rb_erase+0x306/0x3710 [ 38.902863] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 38.921743] RSP: 0018:ffff8801d8bc6918 EFLAGS: 00010202 [ 38.927099] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.934373] RDX: 1ffff1003b178d2b RSI: ffffffff8b5a48a0 RDI: 0000000000000008 [ 38.941637] RBP: ffff8801d8bc7320 R08: dffffc0000000000 R09: fffffbfff135d610 [ 38.948897] R10: fffffbfff135d610 R11: ffffffff89aeb083 R12: ffff8801c4c03270 [ 38.956142] R13: dffffc0000000000 R14: ffff8801d8bc72f8 R15: ffff8801d8bc7438 [ 38.963393] FS: 0000000002650880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 38.971594] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.977453] CR2: 0000000020000000 CR3: 00000001d90c9000 CR4: 00000000001406f0 [ 38.984700] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.991965] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.999208] Call Trace: [ 39.001773] ? lockdep_on+0x50/0x50 [ 39.005396] ? rb_insert_color+0x1460/0x1460 [ 39.009787] ? noop_count+0x40/0x40 [ 39.013406] ? lock_pin_lock+0x350/0x350 [ 39.017449] ? noop_count+0x40/0x40 [ 39.021076] ? kasan_check_read+0x11/0x20 [ 39.025199] ? noop_count+0x40/0x40 [ 39.028805] ? noop_count+0x40/0x40 [ 39.032415] ? lock_pin_lock+0x350/0x350 [ 39.036472] ? mark_held_locks+0x130/0x130 [ 39.040688] ? check_usage_forwards+0x3e0/0x3e0 [ 39.045338] ? __bfs+0x385/0x7a0 [ 39.048681] ? noop_count+0x40/0x40 [ 39.052288] ? check_usage+0x1a9/0x790 [ 39.056154] ? lock_pin_lock+0x350/0x350 [ 39.060218] ? check_usage_forwards+0x3e0/0x3e0 [ 39.064869] ? __bfs+0x385/0x7a0 [ 39.068216] ? __lock_acquire+0x7ec/0x4ec0 [ 39.072431] ? lockdep_on+0x50/0x50 [ 39.076034] ? lock_pin_lock+0x350/0x350 [ 39.080095] ? mark_held_locks+0x130/0x130 [ 39.084332] ? kasan_check_read+0x11/0x20 [ 39.088462] ? __lock_acquire+0x2881/0x4ec0 [ 39.092765] ? mark_held_locks+0x130/0x130 [ 39.096978] ? print_usage_bug+0xc0/0xc0 [ 39.101024] ? _raw_spin_unlock+0x2c/0x50 [ 39.105155] ? graph_lock+0x170/0x170 [ 39.108953] ? ext4_exit_mballoc+0xc0/0xc0 [ 39.113168] ? __lock_acquire+0x7ec/0x4ec0 [ 39.117393] ? find_held_lock+0x36/0x1c0 [ 39.121448] ? mark_held_locks+0x130/0x130 [ 39.125661] ? lock_downgrade+0x900/0x900 [ 39.129788] ? ext4_es_scan+0x960/0x960 [ 39.133742] ? lock_release+0x970/0x970 [ 39.137719] ? do_raw_write_trylock+0x1c0/0x1c0 [ 39.142368] ? kasan_check_write+0x14/0x20 [ 39.146586] ? lock_acquire+0x1ed/0x520 [ 39.150544] ? integrity_inode_free+0x77/0x320 [ 39.155111] ? ext4_es_remove_extent+0x151/0x500 [ 39.159851] ? lock_release+0x970/0x970 [ 39.163807] ? kasan_check_write+0x14/0x20 [ 39.168027] ? do_raw_write_lock+0xbd/0x1b0 [ 39.172331] integrity_inode_free+0x12f/0x320 [ 39.176807] security_inode_free+0x19/0x90 [ 39.181030] __destroy_inode+0x328/0x820 [ 39.185073] ? generic_update_time+0x450/0x450 [ 39.189634] ? evict+0x5d8/0x980 [ 39.192981] ? lock_downgrade+0x900/0x900 [ 39.197111] ? __inode_wait_for_writeback+0x2cf/0x380 [ 39.202285] destroy_inode+0xda/0x200 [ 39.206067] ? __destroy_inode+0x820/0x820 [ 39.210282] ? kasan_check_write+0x14/0x20 [ 39.214496] ? do_raw_spin_lock+0xc1/0x200 [ 39.218715] evict+0x5e0/0x980 [ 39.221891] ? destroy_inode+0x200/0x200 [ 39.225930] ? iput+0x671/0xa90 [ 39.229192] ? lock_downgrade+0x900/0x900 [ 39.233321] ? kasan_check_read+0x11/0x20 [ 39.237483] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.242056] ? lock_downgrade+0x900/0x900 [ 39.246183] iput+0x679/0xa90 [ 39.249301] ? inode_add_lru+0x2a0/0x2a0 [ 39.253343] ? up_write+0x7b/0x220 [ 39.256861] ? up_read+0x110/0x110 [ 39.260394] ? up_read+0x110/0x110 [ 39.263932] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.269453] ? check_preemption_disabled+0x48/0x200 [ 39.274451] ext4_ioctl+0x236f/0x4210 [ 39.278235] ? is_bpf_text_address+0xac/0x170 [ 39.282711] ? ext4_ioctl_group_add+0x560/0x560 [ 39.287376] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 39.293163] ? kasan_check_read+0x11/0x20 [ 39.297293] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.302552] ? rcu_bh_qs+0xc0/0xc0 [ 39.306079] ? rcu_bh_qs+0xc0/0xc0 [ 39.309604] ? unwind_dump+0x190/0x190 [ 39.313490] ? is_bpf_text_address+0xd3/0x170 [ 39.317970] ? kernel_text_address+0x79/0xf0 [ 39.322359] ? __kernel_text_address+0xd/0x40 [ 39.326834] ? unwind_get_return_address+0x61/0xa0 [ 39.331748] ? __save_stack_trace+0x8d/0xf0 [ 39.336053] ? save_stack+0xa9/0xd0 [ 39.339660] ? save_stack+0x43/0xd0 [ 39.343263] ? __kasan_slab_free+0x102/0x150 [ 39.347652] ? kasan_slab_free+0xe/0x10 [ 39.351605] ? kmem_cache_free+0x83/0x290 [ 39.355730] ? putname+0xf2/0x130 [ 39.359167] ? do_sys_open+0x54d/0x700 [ 39.363032] ? __x64_sys_openat+0x9d/0x100 [ 39.367245] ? do_syscall_64+0x1b9/0x820 [ 39.371288] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.376631] ? trace_hardirqs_off+0xb8/0x310 [ 39.381017] ? kasan_check_read+0x11/0x20 [ 39.385146] ? do_raw_spin_unlock+0xa7/0x2f0 [ 39.389535] ? trace_hardirqs_on+0x310/0x310 [ 39.393924] ? kasan_check_write+0x14/0x20 [ 39.398140] ? trace_hardirqs_off+0xb8/0x310 [ 39.402616] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.408133] ? check_preemption_disabled+0x48/0x200 [ 39.413124] ? check_preemption_disabled+0x48/0x200 [ 39.418123] ? ext4_ioctl_group_add+0x560/0x560 [ 39.422775] do_vfs_ioctl+0x1de/0x1720 [ 39.426645] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.431902] ? ioctl_preallocate+0x300/0x300 [ 39.436291] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.441808] ? __fget_light+0x2e9/0x430 [ 39.445767] ? fget_raw+0x20/0x20 [ 39.449201] ? putname+0xf2/0x130 [ 39.452634] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.457631] ? kmem_cache_free+0x24f/0x290 [ 39.461847] ? putname+0xf7/0x130 [ 39.465282] ? do_syscall_64+0x9a/0x820 [ 39.469235] ? do_syscall_64+0x9a/0x820 [ 39.473189] ? lockdep_hardirqs_on+0x421/0x5c0 [ 39.477756] ? security_file_ioctl+0x94/0xc0 [ 39.482144] ksys_ioctl+0xa9/0xd0 [ 39.485585] __x64_sys_ioctl+0x73/0xb0 [ 39.489468] do_syscall_64+0x1b9/0x820 [ 39.493510] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.499127] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.504036] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.508858] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.513867] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.518866] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.523896] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.528721] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.533887] RIP: 0033:0x440029 [ 39.537076] 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 [ 39.556151] RSP: 002b:00007ffeee07b7c8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 39.563846] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 39.571096] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 39.578348] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.585595] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018b0 [ 39.592842] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 39.600092] Modules linked in: [ 39.603405] ---[ end trace 13232078f3a479a3 ]--- [ 39.608205] RIP: 0010:rb_erase+0x306/0x3710 [ 39.612524] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 39.631435] RSP: 0018:ffff8801d8bc6918 EFLAGS: 00010202 [ 39.636798] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.644080] RDX: 1ffff1003b178d2b RSI: ffffffff8b5a48a0 RDI: 0000000000000008 [ 39.651367] RBP: ffff8801d8bc7320 R08: dffffc0000000000 R09: fffffbfff135d610 [ 39.658650] R10: fffffbfff135d610 R11: ffffffff89aeb083 R12: ffff8801c4c03270 [ 39.665916] R13: dffffc0000000000 R14: ffff8801d8bc72f8 R15: ffff8801d8bc7438 [ 39.673201] FS: 0000000002650880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 39.681433] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.687305] CR2: 0000000020000000 CR3: 00000001d90c9000 CR4: 00000000001406f0 [ 39.694597] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.701888] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.709170] Kernel panic - not syncing: Fatal exception [ 39.715413] Kernel Offset: disabled [ 39.719032] Rebooting in 86400 seconds..