[....] 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. [ 26.420033] kauditd_printk_skb: 7 callbacks suppressed [ 26.420044] audit: type=1800 audit(1539914473.069:29): pid=5194 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 26.445173] audit: type=1800 audit(1539914473.069:30): pid=5194 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.115' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.372178] kasan: CONFIG_KASAN_INLINE enabled [ 38.377152] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.384507] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.390725] CPU: 0 PID: 5350 Comm: syz-executor825 Not tainted 4.19.0-rc8+ #67 [ 38.398065] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.407408] RIP: 0010:rb_erase+0x306/0x3710 [ 38.411710] 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 [ 38.430613] RSP: 0018:ffff8801baf76918 EFLAGS: 00010202 [ 38.435959] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.443209] RDX: 1ffff100375eed2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 38.450460] RBP: ffff8801baf77320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 38.457709] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6a74970 [ 38.464977] R13: dffffc0000000000 R14: ffff8801baf772f8 R15: ffff8801baf77438 [ 38.472246] FS: 0000000001de3880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.480484] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.486344] CR2: 0000000020000080 CR3: 00000001d8994000 CR4: 00000000001406f0 [ 38.493601] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.500850] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.508100] Call Trace: [ 38.510680] ? lockdep_on+0x50/0x50 [ 38.514302] ? rb_insert_color+0x1460/0x1460 [ 38.518697] ? lock_downgrade+0x900/0x900 [ 38.522830] ? noop_count+0x40/0x40 [ 38.526438] ? lock_pin_lock+0x350/0x350 [ 38.530494] ? rcu_bh_qs+0xc0/0xc0 [ 38.534030] ? unwind_dump+0x190/0x190 [ 38.537903] ? kasan_check_read+0x11/0x20 [ 38.542036] ? noop_count+0x40/0x40 [ 38.545663] ? lock_pin_lock+0x350/0x350 [ 38.549706] ? mark_held_locks+0x130/0x130 [ 38.553937] ? check_usage_forwards+0x3e0/0x3e0 [ 38.558602] ? __bfs+0x385/0x7a0 [ 38.561965] ? check_usage+0x1a9/0x790 [ 38.565835] ? lock_pin_lock+0x350/0x350 [ 38.569879] ? check_usage_forwards+0x3e0/0x3e0 [ 38.574528] ? __bfs+0x385/0x7a0 [ 38.577876] ? modules_open+0xa0/0xa0 [ 38.581660] ? lockdep_on+0x50/0x50 [ 38.585266] ? lock_pin_lock+0x350/0x350 [ 38.589327] ? mark_held_locks+0x130/0x130 [ 38.593544] ? kasan_check_read+0x11/0x20 [ 38.597672] ? __lock_acquire+0x2881/0x4ec0 [ 38.601982] ? mark_held_locks+0x130/0x130 [ 38.606200] ? print_usage_bug+0xc0/0xc0 [ 38.610243] ? _raw_spin_unlock+0x2c/0x50 [ 38.614373] ? graph_lock+0x170/0x170 [ 38.618163] ? ext4_exit_mballoc+0xc0/0xc0 [ 38.622380] ? __lock_acquire+0x7ec/0x4ec0 [ 38.626598] ? find_held_lock+0x36/0x1c0 [ 38.630643] ? mark_held_locks+0x130/0x130 [ 38.634862] ? lock_downgrade+0x900/0x900 [ 38.638992] ? ext4_es_scan+0x960/0x960 [ 38.642947] ? lock_release+0x970/0x970 [ 38.646908] ? do_raw_write_trylock+0x1c0/0x1c0 [ 38.651561] ? kasan_check_write+0x14/0x20 [ 38.655778] ? lock_acquire+0x1ed/0x520 [ 38.659733] ? integrity_inode_free+0x77/0x320 [ 38.664295] ? ext4_es_remove_extent+0x151/0x500 [ 38.669035] ? lock_release+0x970/0x970 [ 38.673008] ? kasan_check_write+0x14/0x20 [ 38.677225] ? do_raw_write_lock+0xbd/0x1b0 [ 38.681531] integrity_inode_free+0x12f/0x320 [ 38.686026] security_inode_free+0x19/0x90 [ 38.690245] __destroy_inode+0x328/0x820 [ 38.694288] ? generic_update_time+0x450/0x450 [ 38.698867] ? evict+0x5d8/0x980 [ 38.702215] ? lock_downgrade+0x900/0x900 [ 38.706347] ? __inode_wait_for_writeback+0x2cf/0x380 [ 38.711521] destroy_inode+0xda/0x200 [ 38.715302] ? __destroy_inode+0x820/0x820 [ 38.719517] ? kasan_check_write+0x14/0x20 [ 38.723735] ? do_raw_spin_lock+0xc1/0x200 [ 38.727951] evict+0x5e0/0x980 [ 38.731133] ? destroy_inode+0x200/0x200 [ 38.735179] ? iput+0x671/0xa90 [ 38.738440] ? lock_downgrade+0x900/0x900 [ 38.742573] ? kasan_check_read+0x11/0x20 [ 38.746704] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.751269] ? lock_downgrade+0x900/0x900 [ 38.755419] iput+0x679/0xa90 [ 38.758522] ? inode_add_lru+0x2a0/0x2a0 [ 38.762562] ? up_write+0x7b/0x220 [ 38.766135] ? up_read+0x110/0x110 [ 38.769664] ? up_read+0x110/0x110 [ 38.773187] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.778723] ? check_preemption_disabled+0x48/0x200 [ 38.783726] ext4_ioctl+0x236f/0x4210 [ 38.787513] ? is_bpf_text_address+0xac/0x170 [ 38.791989] ? ext4_ioctl_group_add+0x560/0x560 [ 38.796641] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 38.802419] ? kasan_check_read+0x11/0x20 [ 38.806551] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.811808] ? rcu_bh_qs+0xc0/0xc0 [ 38.815332] ? rcu_bh_qs+0xc0/0xc0 [ 38.818854] ? unwind_dump+0x190/0x190 [ 38.822724] ? is_bpf_text_address+0xd3/0x170 [ 38.827203] ? kernel_text_address+0x79/0xf0 [ 38.831591] ? __kernel_text_address+0xd/0x40 [ 38.836069] ? unwind_get_return_address+0x61/0xa0 [ 38.840979] ? __save_stack_trace+0x8d/0xf0 [ 38.845284] ? save_stack+0xa9/0xd0 [ 38.848893] ? save_stack+0x43/0xd0 [ 38.852498] ? __kasan_slab_free+0x102/0x150 [ 38.856884] ? kasan_slab_free+0xe/0x10 [ 38.860841] ? kmem_cache_free+0x83/0x290 [ 38.864967] ? putname+0xf2/0x130 [ 38.868401] ? do_sys_open+0x54d/0x700 [ 38.872269] ? __x64_sys_openat+0x9d/0x100 [ 38.876485] ? do_syscall_64+0x1b9/0x820 [ 38.880530] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.885877] ? trace_hardirqs_off+0xb8/0x310 [ 38.890274] ? kasan_check_read+0x11/0x20 [ 38.894405] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.898810] ? trace_hardirqs_on+0x310/0x310 [ 38.903203] ? kasan_check_write+0x14/0x20 [ 38.907422] ? trace_hardirqs_off+0xb8/0x310 [ 38.911815] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.917340] ? check_preemption_disabled+0x48/0x200 [ 38.922337] ? check_preemption_disabled+0x48/0x200 [ 38.927335] ? ext4_ioctl_group_add+0x560/0x560 [ 38.931985] do_vfs_ioctl+0x1de/0x1720 [ 38.935859] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.941127] ? ioctl_preallocate+0x300/0x300 [ 38.945521] ? memset+0x31/0x40 [ 38.948782] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.954317] ? smack_file_ioctl+0x210/0x3c0 [ 38.958620] ? fget_raw+0x20/0x20 [ 38.962070] ? smack_file_lock+0x2e0/0x2e0 [ 38.966291] ? do_syscall_64+0x9a/0x820 [ 38.970245] ? do_syscall_64+0x9a/0x820 [ 38.974205] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.979725] ? security_file_ioctl+0x94/0xc0 [ 38.984122] ksys_ioctl+0xa9/0xd0 [ 38.987577] __x64_sys_ioctl+0x73/0xb0 [ 38.991448] do_syscall_64+0x1b9/0x820 [ 38.995316] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.000668] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.005582] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.010549] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.015550] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.020547] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.025545] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.030375] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.035649] RIP: 0033:0x440009 [ 39.038842] 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 [ 39.057736] RSP: 002b:00007ffe7c8d8888 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 39.065435] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 39.072696] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 39.080166] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.087433] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 39.094680] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 39.101933] Modules linked in: [ 39.105237] ---[ end trace aa9c5db89e4bb08d ]--- [ 39.110036] RIP: 0010:rb_erase+0x306/0x3710 [ 39.114360] 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 [ 39.133281] RSP: 0018:ffff8801baf76918 EFLAGS: 00010202 [ 39.138668] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.145956] RDX: 1ffff100375eed2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 39.153243] RBP: ffff8801baf77320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 39.160530] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6a74970 [ 39.167818] R13: dffffc0000000000 R14: ffff8801baf772f8 R15: ffff8801baf77438 [ 39.175089] FS: 0000000001de3880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.183333] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.189228] CR2: 0000000020000080 CR3: 00000001d8994000 CR4: 00000000001406f0 [ 39.196519] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.203789] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.211078] Kernel panic - not syncing: Fatal exception [ 39.217334] Kernel Offset: disabled [ 39.220955] Rebooting in 86400 seconds..