[....] 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. [ 27.476993] kauditd_printk_skb: 7 callbacks suppressed [ 27.477004] audit: type=1800 audit(1537920886.707:29): pid=5457 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 [ 27.503681] audit: type=1800 audit(1537920886.707:30): pid=5457 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 '10.128.10.11' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 37.207741] kasan: CONFIG_KASAN_INLINE enabled [ 37.212523] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.219900] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.226120] CPU: 0 PID: 5612 Comm: syz-executor043 Not tainted 4.19.0-rc5-next-20180925+ #80 [ 37.234678] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.244022] RIP: 0010:rb_erase+0x306/0x3710 [ 37.248326] 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 [ 37.267211] RSP: 0018:ffff8801bb2d6918 EFLAGS: 00010202 [ 37.272557] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 37.279807] RDX: 1ffff1003765ad2b RSI: ffffffff8b5a4340 RDI: 0000000000000008 [ 37.287056] RBP: ffff8801bb2d7320 R08: dffffc0000000000 R09: fffffbfff135d930 [ 37.294322] R10: fffffbfff135d930 R11: ffffffff89aec983 R12: ffff8801b738f1f0 [ 37.301769] R13: dffffc0000000000 R14: ffff8801bb2d72f8 R15: ffff8801bb2d7438 [ 37.309034] FS: 0000000000efe880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 37.317244] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.323105] CR2: 0000000020000700 CR3: 00000001bbd8c000 CR4: 00000000001406f0 [ 37.330355] Call Trace: [ 37.332962] ? lockdep_on+0x50/0x50 [ 37.336575] ? rb_insert_color+0x1460/0x1460 [ 37.340986] ? noop_count+0x40/0x40 [ 37.344597] ? lock_pin_lock+0x350/0x350 [ 37.348639] ? noop_count+0x40/0x40 [ 37.352252] ? kasan_check_read+0x11/0x20 [ 37.356396] ? noop_count+0x40/0x40 [ 37.360016] ? noop_count+0x40/0x40 [ 37.363626] ? lock_pin_lock+0x350/0x350 [ 37.367668] ? mark_held_locks+0x130/0x130 [ 37.371887] ? check_usage_forwards+0x3e0/0x3e0 [ 37.376540] ? __bfs+0x385/0x7a0 [ 37.379893] ? noop_count+0x40/0x40 [ 37.383507] ? check_usage+0x1a9/0x790 [ 37.387397] ? lock_pin_lock+0x350/0x350 [ 37.391447] ? check_usage_forwards+0x3e0/0x3e0 [ 37.396100] ? __bfs+0x385/0x7a0 [ 37.399461] ? __lock_acquire+0x7ec/0x4ec0 [ 37.403683] ? lockdep_on+0x50/0x50 [ 37.407292] ? lock_pin_lock+0x350/0x350 [ 37.411342] ? mark_held_locks+0x130/0x130 [ 37.415560] ? kasan_check_read+0x11/0x20 [ 37.419705] ? __lock_acquire+0x2881/0x4ec0 [ 37.424015] ? mark_held_locks+0x130/0x130 [ 37.428236] ? print_usage_bug+0xc0/0xc0 [ 37.432284] ? _raw_spin_unlock+0x2c/0x50 [ 37.436417] ? graph_lock+0x170/0x170 [ 37.440199] ? ext4_exit_mballoc+0xc0/0xc0 [ 37.444417] ? __lock_acquire+0x7ec/0x4ec0 [ 37.448633] ? find_held_lock+0x36/0x1c0 [ 37.452699] ? mark_held_locks+0x130/0x130 [ 37.456919] ? lock_downgrade+0x900/0x900 [ 37.461050] ? ext4_es_scan+0x950/0x950 [ 37.465007] ? lock_release+0x970/0x970 [ 37.468983] ? do_raw_write_trylock+0x1c0/0x1c0 [ 37.473636] ? kasan_check_write+0x14/0x20 [ 37.477882] ? lock_acquire+0x1ed/0x520 [ 37.481846] ? integrity_inode_free+0x77/0x320 [ 37.486409] ? ext4_es_remove_extent+0x14c/0x4f0 [ 37.491153] ? lock_release+0x970/0x970 [ 37.495113] ? kasan_check_write+0x14/0x20 [ 37.499331] ? do_raw_write_lock+0xbd/0x1b0 [ 37.503654] integrity_inode_free+0x12f/0x320 [ 37.508135] security_inode_free+0x19/0x90 [ 37.512355] __destroy_inode+0x328/0x820 [ 37.516412] ? generic_update_time+0x450/0x450 [ 37.520980] ? evict+0x5d8/0x980 [ 37.524332] ? lock_downgrade+0x900/0x900 [ 37.528463] ? __inode_wait_for_writeback+0x2cf/0x380 [ 37.533637] destroy_inode+0xda/0x200 [ 37.537422] ? __destroy_inode+0x820/0x820 [ 37.541641] ? kasan_check_write+0x14/0x20 [ 37.545857] ? do_raw_spin_lock+0xc1/0x200 [ 37.550078] evict+0x5e0/0x980 [ 37.553255] ? destroy_inode+0x200/0x200 [ 37.557301] ? iput+0x66c/0xa90 [ 37.560578] ? lock_downgrade+0x900/0x900 [ 37.564711] ? kasan_check_read+0x11/0x20 [ 37.568839] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 37.573431] ? lock_downgrade+0x900/0x900 [ 37.577564] iput+0x674/0xa90 [ 37.580657] ? inode_add_lru+0x2a0/0x2a0 [ 37.584701] ? up_write+0x7b/0x220 [ 37.588221] ? down_write_nested+0x130/0x130 [ 37.592612] ? down_write_nested+0x130/0x130 [ 37.597021] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.602544] ? check_preemption_disabled+0x48/0x200 [ 37.607544] ext4_ioctl+0x236a/0x4210 [ 37.611338] ? ext4_ioctl_group_add+0x560/0x560 [ 37.615988] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 37.620901] ? kasan_check_read+0x11/0x20 [ 37.625030] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 37.630289] ? rcu_softirq_qs+0x20/0x20 [ 37.634245] ? rcu_softirq_qs+0x20/0x20 [ 37.638199] ? unwind_dump+0x190/0x190 [ 37.642071] ? is_bpf_text_address+0xd3/0x170 [ 37.646546] ? kernel_text_address+0x79/0xf0 [ 37.650938] ? __kernel_text_address+0xd/0x40 [ 37.655432] ? unwind_get_return_address+0x61/0xa0 [ 37.660348] ? __save_stack_trace+0x8d/0xf0 [ 37.664665] ? save_stack+0xa9/0xd0 [ 37.668275] ? save_stack+0x43/0xd0 [ 37.671882] ? __kasan_slab_free+0x102/0x150 [ 37.676277] ? kasan_slab_free+0xe/0x10 [ 37.680232] ? kmem_cache_free+0x83/0x290 [ 37.684363] ? putname+0xf2/0x130 [ 37.687837] ? do_sys_open+0x54d/0x700 [ 37.691708] ? __x64_sys_open+0x7e/0xc0 [ 37.695676] ? do_syscall_64+0x1b9/0x820 [ 37.699737] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.705088] ? trace_hardirqs_off+0xb8/0x310 [ 37.709479] ? kasan_check_read+0x11/0x20 [ 37.713610] ? do_raw_spin_unlock+0xa7/0x2f0 [ 37.718001] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.723001] ? kasan_check_write+0x14/0x20 [ 37.727218] ? trace_hardirqs_off+0xb8/0x310 [ 37.731612] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.737131] ? ext4_ioctl_group_add+0x560/0x560 [ 37.741781] do_vfs_ioctl+0x1de/0x1720 [ 37.745655] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 37.751177] ? ioctl_preallocate+0x300/0x300 [ 37.755568] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.761086] ? __fget_light+0x2e9/0x430 [ 37.765041] ? fget_raw+0x20/0x20 [ 37.768482] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.773481] ? kmem_cache_free+0x24f/0x290 [ 37.777698] ? putname+0xf7/0x130 [ 37.781136] ? do_syscall_64+0x9a/0x820 [ 37.785107] ? do_syscall_64+0x9a/0x820 [ 37.789068] ? lockdep_hardirqs_on+0x421/0x5c0 [ 37.793634] ? security_file_ioctl+0x94/0xc0 [ 37.798025] ksys_ioctl+0xa9/0xd0 [ 37.801463] __x64_sys_ioctl+0x73/0xb0 [ 37.805349] do_syscall_64+0x1b9/0x820 [ 37.809235] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.814584] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.819515] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.824343] ? trace_hardirqs_off+0x310/0x310 [ 37.828824] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.833827] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.838826] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.843652] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.848846] RIP: 0033:0x440029 [ 37.852023] 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 [ 37.870906] RSP: 002b:00007ffc58ae51d8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 37.878595] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 37.885848] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 37.893097] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 37.900349] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 37.907603] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 37.914854] Modules linked in: [ 37.918126] ---[ end trace 4a25e915adbaa2e7 ]--- [ 37.922927] RIP: 0010:rb_erase+0x306/0x3710 [ 37.927256] 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 [ 37.946220] RSP: 0018:ffff8801bb2d6918 EFLAGS: 00010202 [ 37.951613] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 37.958868] RDX: 1ffff1003765ad2b RSI: ffffffff8b5a4340 RDI: 0000000000000008 [ 37.966168] RBP: ffff8801bb2d7320 R08: dffffc0000000000 R09: fffffbfff135d930 [ 37.973462] R10: fffffbfff135d930 R11: ffffffff89aec983 R12: ffff8801b738f1f0 [ 37.980752] R13: dffffc0000000000 R14: ffff8801bb2d72f8 R15: ffff8801bb2d7438 [ 37.988023] FS: 0000000000efe880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 37.996270] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.002182] CR2: 0000000020000700 CR3: 00000001bbd8c000 CR4: 00000000001406f0 [ 38.009442] Kernel panic - not syncing: Fatal exception [ 38.015675] Kernel Offset: disabled [ 38.019296] Rebooting in 86400 seconds..