[....] 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. [ 26.562095] kauditd_printk_skb: 7 callbacks suppressed [ 26.562107] audit: type=1800 audit(1540421112.894:29): pid=5229 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 [ 26.593818] audit: type=1800 audit(1540421112.894:30): pid=5229 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 '10.128.0.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 58.431963] kasan: CONFIG_KASAN_INLINE enabled [ 58.436664] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 58.444114] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 58.450359] CPU: 0 PID: 5386 Comm: syz-executor047 Not tainted 4.19.0+ #153 [ 58.457454] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.466804] RIP: 0010:rb_erase+0x306/0x3710 [ 58.471114] 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 [ 58.490003] RSP: 0018:ffff8801c6346918 EFLAGS: 00010202 [ 58.495354] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 58.502608] RDX: 1ffff10038c68d2b RSI: ffffffff8af92020 RDI: 0000000000000008 [ 58.509872] RBP: ffff8801c6347320 R08: dffffc0000000000 R09: ffffed0038c68e53 [ 58.517125] R10: ffffed0038c68e53 R11: 0000000000000003 R12: ffff8801b7360970 [ 58.524385] R13: dffffc0000000000 R14: ffff8801c63472f8 R15: ffff8801c6347438 [ 58.531642] FS: 00000000025ff880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 58.539860] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 58.545724] CR2: 0000000020000080 CR3: 00000001d8c98000 CR4: 00000000001406f0 [ 58.552978] Call Trace: [ 58.555558] ? modules_open+0xa0/0xa0 [ 58.559351] ? rb_insert_color+0x1460/0x1460 [ 58.563754] ? noop_count+0x40/0x40 [ 58.567364] ? print_bfs_bug+0x80/0x80 [ 58.571239] ? mark_held_locks+0x130/0x130 [ 58.575460] ? kernel_text_address+0x79/0xf0 [ 58.579855] ? noop_count+0x40/0x40 [ 58.583465] ? print_bfs_bug+0x80/0x80 [ 58.587374] ? noop_count+0x40/0x40 [ 58.590990] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 58.596512] ? check_usage_forwards+0x3d0/0x3d0 [ 58.601165] ? __bfs+0x321/0x780 [ 58.604517] ? check_usage+0x1aa/0x790 [ 58.608403] ? print_bfs_bug+0x80/0x80 [ 58.612283] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 58.617195] ? check_usage_forwards+0x3d0/0x3d0 [ 58.621851] ? kasan_check_read+0x11/0x20 [ 58.625983] ? graph_lock+0x9c/0x270 [ 58.629679] ? __bfs+0x321/0x780 [ 58.633030] ? trace_event_raw_event_lock_acquire+0x440/0x440 [ 58.638901] ? lockdep_on+0x50/0x50 [ 58.642510] ? print_bfs_bug+0x80/0x80 [ 58.646383] ? kasan_check_read+0x11/0x20 [ 58.650512] ? graph_lock+0x9c/0x270 [ 58.654209] ? trace_event_raw_event_lock_acquire+0x440/0x440 [ 58.660081] ? mark_held_locks+0x130/0x130 [ 58.664304] ? kasan_check_read+0x11/0x20 [ 58.668439] ? __lock_acquire+0x2aff/0x4c20 [ 58.672754] ? mark_held_locks+0x130/0x130 [ 58.676976] ? print_usage_bug+0xc0/0xc0 [ 58.681030] ? print_usage_bug+0xc0/0xc0 [ 58.685076] ? __lock_acquire+0x62f/0x4c20 [ 58.689328] ? zap_class+0x640/0x640 [ 58.693029] ? print_usage_bug+0xc0/0xc0 [ 58.697073] ? __lock_acquire+0x62f/0x4c20 [ 58.701296] ? mark_held_locks+0x130/0x130 [ 58.705514] ? lock_downgrade+0x900/0x900 [ 58.709658] ? ext4_es_scan+0x960/0x960 [ 58.713629] ? kasan_check_read+0x11/0x20 [ 58.717775] ? do_raw_write_lock+0x14f/0x310 [ 58.722173] ? do_raw_write_trylock+0x270/0x270 [ 58.726828] ? lock_acquire+0x1ed/0x520 [ 58.730791] ? integrity_inode_free+0x77/0x320 [ 58.735360] ? ext4_es_remove_extent+0x151/0x500 [ 58.740103] ? kasan_check_read+0x11/0x20 [ 58.744239] ? do_raw_write_lock+0x14f/0x310 [ 58.748635] ? do_raw_read_unlock+0x70/0x70 [ 58.752946] ? zap_class+0x640/0x640 [ 58.756654] integrity_inode_free+0x12f/0x320 [ 58.761140] security_inode_free+0x19/0x90 [ 58.765394] __destroy_inode+0x328/0x820 [ 58.769441] ? clear_nlink+0xe0/0xe0 [ 58.773136] ? evict+0x5d8/0x980 [ 58.776491] ? lock_downgrade+0x900/0x900 [ 58.780630] ? __inode_wait_for_writeback+0x2cf/0x380 [ 58.785812] destroy_inode+0xda/0x200 [ 58.789598] ? __destroy_inode+0x820/0x820 [ 58.793830] evict+0x5e0/0x980 [ 58.797009] ? destroy_inode+0x200/0x200 [ 58.801057] ? iput+0x671/0xa90 [ 58.804323] ? lock_downgrade+0x900/0x900 [ 58.808456] ? kasan_check_read+0x11/0x20 [ 58.812589] ? do_raw_spin_trylock+0x270/0x270 [ 58.817159] ? lock_downgrade+0x900/0x900 [ 58.821296] iput+0x679/0xa90 [ 58.824388] ? inode_add_lru+0x2a0/0x2a0 [ 58.828437] ? up_write+0x7b/0x220 [ 58.831963] ? down_write_nested+0x130/0x130 [ 58.836355] ? down_write_nested+0x130/0x130 [ 58.840754] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.846281] ? check_preemption_disabled+0x48/0x280 [ 58.851294] ext4_ioctl+0x236f/0x4210 [ 58.855081] ? is_bpf_text_address+0xac/0x170 [ 58.859567] ? ext4_ioctl_group_add+0x560/0x560 [ 58.864222] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 58.869137] ? kasan_check_read+0x11/0x20 [ 58.873275] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 58.878536] ? rcu_softirq_qs+0x20/0x20 [ 58.882496] ? rcu_softirq_qs+0x20/0x20 [ 58.886452] ? unwind_dump+0x190/0x190 [ 58.890337] ? is_bpf_text_address+0xd3/0x170 [ 58.894835] ? kernel_text_address+0x79/0xf0 [ 58.899229] ? __kernel_text_address+0xd/0x40 [ 58.903709] ? unwind_get_return_address+0x61/0xa0 [ 58.908638] ? __save_stack_trace+0x8d/0xf0 [ 58.912970] ? save_stack+0xa9/0xd0 [ 58.916581] ? save_stack+0x43/0xd0 [ 58.920193] ? __kasan_slab_free+0x102/0x150 [ 58.924583] ? kasan_slab_free+0xe/0x10 [ 58.928536] ? kmem_cache_free+0x83/0x290 [ 58.932673] ? putname+0xf2/0x130 [ 58.936113] ? do_sys_open+0x54d/0x700 [ 58.939985] ? __x64_sys_openat+0x9d/0x100 [ 58.944207] ? do_syscall_64+0x1b9/0x820 [ 58.948253] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.953607] ? trace_hardirqs_off+0xb8/0x310 [ 58.958007] ? kasan_check_read+0x11/0x20 [ 58.962149] ? do_raw_spin_unlock+0xa7/0x330 [ 58.966550] ? trace_hardirqs_on+0x310/0x310 [ 58.970950] ? trace_hardirqs_off+0xb8/0x310 [ 58.975342] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.980865] ? ext4_ioctl_group_add+0x560/0x560 [ 58.985521] do_vfs_ioctl+0x1de/0x1720 [ 58.989398] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 58.994918] ? ioctl_preallocate+0x300/0x300 [ 58.999309] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.004828] ? __fget_light+0x2e9/0x430 [ 59.008800] ? fget_raw+0x20/0x20 [ 59.012248] ? putname+0xf2/0x130 [ 59.015684] ? rcu_read_lock_sched_held+0x14f/0x180 [ 59.020683] ? kmem_cache_free+0x24f/0x290 [ 59.024900] ? putname+0xf7/0x130 [ 59.028337] ? do_syscall_64+0x9a/0x820 [ 59.032296] ? do_syscall_64+0x9a/0x820 [ 59.036253] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 59.040821] ? security_file_ioctl+0x94/0xc0 [ 59.045214] ksys_ioctl+0xa9/0xd0 [ 59.048659] __x64_sys_ioctl+0x73/0xb0 [ 59.052535] do_syscall_64+0x1b9/0x820 [ 59.056408] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 59.061758] ? syscall_return_slowpath+0x5e0/0x5e0 [ 59.066670] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 59.071519] ? trace_hardirqs_on_caller+0x310/0x310 [ 59.076521] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 59.081522] ? prepare_exit_to_usermode+0x291/0x3b0 [ 59.086523] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 59.091355] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 59.096530] RIP: 0033:0x440009 [ 59.099710] 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 [ 59.118597] RSP: 002b:00007ffea7096c58 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 59.126295] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 59.133550] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 59.140822] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 59.148074] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 59.155323] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 59.162580] Modules linked in: [ 59.165877] ---[ end trace 0e93028a1858a6b7 ]--- [ 59.170681] RIP: 0010:rb_erase+0x306/0x3710 [ 59.174994] 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 [ 59.193919] RSP: 0018:ffff8801c6346918 EFLAGS: 00010202 [ 59.199304] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 59.206560] RDX: 1ffff10038c68d2b RSI: ffffffff8af92020 RDI: 0000000000000008 [ 59.213846] RBP: ffff8801c6347320 R08: dffffc0000000000 R09: ffffed0038c68e53 [ 59.221132] R10: ffffed0038c68e53 R11: 0000000000000003 R12: ffff8801b7360970 [ 59.228390] R13: dffffc0000000000 R14: ffff8801c63472f8 R15: ffff8801c6347438 [ 59.235687] FS: 00000000025ff880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 59.243931] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 59.249833] CR2: 0000000020000080 CR3: 00000001d8c98000 CR4: 00000000001406f0 [ 59.257110] Kernel panic - not syncing: Fatal exception [ 59.263345] Kernel Offset: disabled [ 59.266967] Rebooting in 86400 seconds..