[....] 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. [ 27.785281] kauditd_printk_skb: 7 callbacks suppressed [ 27.785293] audit: type=1800 audit(1540314870.752:29): pid=5239 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 [ 27.811686] audit: type=1800 audit(1540314870.752:30): pid=5239 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 '10.128.10.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.906805] kasan: CONFIG_KASAN_INLINE enabled [ 38.911564] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.918917] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.925137] CPU: 0 PID: 5394 Comm: syz-executor423 Not tainted 4.19.0-rc8+ #152 [ 38.932569] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.941917] RIP: 0010:rb_erase+0x306/0x3710 [ 38.946226] 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 [ 38.965139] RSP: 0018:ffff8801d858e918 EFLAGS: 00010202 [ 38.970492] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.977745] RDX: 1ffff1003b0b1d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 38.984996] RBP: ffff8801d858f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 38.992248] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b731d970 [ 38.999501] R13: dffffc0000000000 R14: ffff8801d858f2f8 R15: ffff8801d858f438 [ 39.006756] FS: 0000000001b2c880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.014966] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.020873] CR2: 0000000020000080 CR3: 00000001d8e26000 CR4: 00000000001406f0 [ 39.028165] Call Trace: [ 39.030741] ? lockdep_on+0x50/0x50 [ 39.034365] ? rb_insert_color+0x1460/0x1460 [ 39.038754] ? lock_downgrade+0x900/0x900 [ 39.042885] ? noop_count+0x40/0x40 [ 39.046515] ? lock_pin_lock+0x350/0x350 [ 39.050592] ? rcu_bh_qs+0xc0/0xc0 [ 39.054115] ? unwind_dump+0x190/0x190 [ 39.058002] ? kasan_check_read+0x11/0x20 [ 39.062138] ? noop_count+0x40/0x40 [ 39.065771] ? lock_pin_lock+0x350/0x350 [ 39.069843] ? mark_held_locks+0x130/0x130 [ 39.074086] ? check_usage_forwards+0x3e0/0x3e0 [ 39.078742] ? __bfs+0x385/0x7a0 [ 39.082097] ? check_usage+0x1a9/0x790 [ 39.086005] ? lock_pin_lock+0x350/0x350 [ 39.090090] ? check_usage_forwards+0x3e0/0x3e0 [ 39.094742] ? __bfs+0x385/0x7a0 [ 39.098093] ? lockdep_on+0x50/0x50 [ 39.101705] ? lock_pin_lock+0x350/0x350 [ 39.105755] ? mark_held_locks+0x130/0x130 [ 39.110001] ? kasan_check_read+0x11/0x20 [ 39.114177] ? __lock_acquire+0x2881/0x4ec0 [ 39.118499] ? mark_held_locks+0x130/0x130 [ 39.122717] ? print_usage_bug+0xc0/0xc0 [ 39.126764] ? _raw_spin_unlock+0x2c/0x50 [ 39.130900] ? graph_lock+0x170/0x170 [ 39.134698] ? ext4_exit_mballoc+0xc0/0xc0 [ 39.138927] ? __lock_acquire+0x7ec/0x4ec0 [ 39.143152] ? find_held_lock+0x36/0x1c0 [ 39.147196] ? mark_held_locks+0x130/0x130 [ 39.151436] ? lock_downgrade+0x900/0x900 [ 39.155571] ? ext4_es_scan+0x960/0x960 [ 39.159528] ? lock_release+0x970/0x970 [ 39.163503] ? do_raw_write_trylock+0x1c0/0x1c0 [ 39.168164] ? kasan_check_write+0x14/0x20 [ 39.172383] ? lock_acquire+0x1ed/0x520 [ 39.176360] ? integrity_inode_free+0x77/0x320 [ 39.180965] ? ext4_es_remove_extent+0x151/0x500 [ 39.185704] ? lock_release+0x970/0x970 [ 39.189666] ? kasan_check_write+0x14/0x20 [ 39.193895] ? do_raw_write_lock+0xbd/0x1e0 [ 39.198210] integrity_inode_free+0x12f/0x320 [ 39.202705] security_inode_free+0x19/0x90 [ 39.206925] __destroy_inode+0x328/0x820 [ 39.210968] ? generic_update_time+0x450/0x450 [ 39.215533] ? evict+0x5d8/0x980 [ 39.218878] ? lock_downgrade+0x900/0x900 [ 39.223043] ? __inode_wait_for_writeback+0x2cf/0x380 [ 39.228218] destroy_inode+0xda/0x200 [ 39.231998] ? __destroy_inode+0x820/0x820 [ 39.236216] ? kasan_check_write+0x14/0x20 [ 39.240440] ? do_raw_spin_lock+0xc1/0x230 [ 39.244659] evict+0x5e0/0x980 [ 39.247845] ? destroy_inode+0x200/0x200 [ 39.251890] ? iput+0x671/0xa90 [ 39.255167] ? lock_downgrade+0x900/0x900 [ 39.259311] ? kasan_check_read+0x11/0x20 [ 39.263465] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.268078] ? lock_downgrade+0x900/0x900 [ 39.272210] iput+0x679/0xa90 [ 39.275312] ? inode_add_lru+0x2a0/0x2a0 [ 39.283439] ? up_write+0x7b/0x220 [ 39.286960] ? up_read+0x110/0x110 [ 39.290478] ? up_read+0x110/0x110 [ 39.294018] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.299560] ? check_preemption_disabled+0x48/0x280 [ 39.304565] ext4_ioctl+0x236f/0x4210 [ 39.308349] ? is_bpf_text_address+0xac/0x170 [ 39.312856] ? ext4_ioctl_group_add+0x560/0x560 [ 39.317528] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 39.323309] ? kasan_check_read+0x11/0x20 [ 39.327445] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.332705] ? rcu_bh_qs+0xc0/0xc0 [ 39.336232] ? rcu_bh_qs+0xc0/0xc0 [ 39.339774] ? unwind_dump+0x190/0x190 [ 39.343661] ? is_bpf_text_address+0xd3/0x170 [ 39.348142] ? kernel_text_address+0x79/0xf0 [ 39.352557] ? __kernel_text_address+0xd/0x40 [ 39.357035] ? unwind_get_return_address+0x61/0xa0 [ 39.361971] ? __save_stack_trace+0x8d/0xf0 [ 39.366275] ? save_stack+0xa9/0xd0 [ 39.369885] ? save_stack+0x43/0xd0 [ 39.373495] ? __kasan_slab_free+0x102/0x150 [ 39.377883] ? kasan_slab_free+0xe/0x10 [ 39.381888] ? kmem_cache_free+0x83/0x290 [ 39.386045] ? putname+0xf2/0x130 [ 39.389482] ? do_sys_open+0x54d/0x700 [ 39.393350] ? __x64_sys_openat+0x9d/0x100 [ 39.397584] ? do_syscall_64+0x1b9/0x820 [ 39.401632] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.406980] ? trace_hardirqs_off+0xb8/0x310 [ 39.411370] ? kasan_check_read+0x11/0x20 [ 39.415503] ? do_raw_spin_unlock+0xa7/0x330 [ 39.419940] ? trace_hardirqs_on+0x310/0x310 [ 39.424335] ? kasan_check_write+0x14/0x20 [ 39.428566] ? trace_hardirqs_off+0xb8/0x310 [ 39.432959] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.438480] ? check_preemption_disabled+0x48/0x280 [ 39.443498] ? check_preemption_disabled+0x48/0x280 [ 39.448504] ? ext4_ioctl_group_add+0x560/0x560 [ 39.453166] do_vfs_ioctl+0x1de/0x1720 [ 39.457054] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.462341] ? ioctl_preallocate+0x300/0x300 [ 39.466733] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.472252] ? __fget_light+0x2e9/0x430 [ 39.476208] ? fget_raw+0x20/0x20 [ 39.479655] ? putname+0xf2/0x130 [ 39.483094] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.488108] ? kmem_cache_free+0x24f/0x290 [ 39.492326] ? putname+0xf7/0x130 [ 39.495782] ? do_syscall_64+0x9a/0x820 [ 39.499757] ? do_syscall_64+0x9a/0x820 [ 39.503717] ? lockdep_hardirqs_on+0x421/0x5c0 [ 39.508298] ? security_file_ioctl+0x94/0xc0 [ 39.512704] ksys_ioctl+0xa9/0xd0 [ 39.516163] __x64_sys_ioctl+0x73/0xb0 [ 39.520036] do_syscall_64+0x1b9/0x820 [ 39.523917] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.529265] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.534178] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.539005] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.544032] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.549045] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.554060] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.558903] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.564139] RIP: 0033:0x440009 [ 39.567330] 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 [ 39.586213] RSP: 002b:00007ffe31b768d8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 39.593916] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 39.601171] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 39.608420] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.615698] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 39.622951] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 39.630257] Modules linked in: [ 39.633567] ---[ end trace 4fa8adc220df6ded ]--- [ 39.638354] RIP: 0010:rb_erase+0x306/0x3710 [ 39.642755] 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 [ 39.661697] RSP: 0018:ffff8801d858e918 EFLAGS: 00010202 [ 39.667082] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.674656] RDX: 1ffff1003b0b1d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 39.681956] RBP: ffff8801d858f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 39.689243] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b731d970 [ 39.696496] R13: dffffc0000000000 R14: ffff8801d858f2f8 R15: ffff8801d858f438 [ 39.703788] FS: 0000000001b2c880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.712033] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.718103] CR2: 0000000020000080 CR3: 00000001d8e26000 CR4: 00000000001406f0 [ 39.725392] Kernel panic - not syncing: Fatal exception [ 39.731616] Kernel Offset: disabled [ 39.735240] Rebooting in 86400 seconds..