[....] 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. [ 26.911061] kauditd_printk_skb: 7 callbacks suppressed [ 26.911074] audit: type=1800 audit(1540429527.295:29): 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 [ 26.944681] audit: type=1800 audit(1540429527.305:30): 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 '10.128.0.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.129968] kasan: CONFIG_KASAN_INLINE enabled [ 36.134707] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.142067] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.148286] CPU: 0 PID: 5382 Comm: syz-executor242 Not tainted 4.19.0+ #153 [ 36.155366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.164735] RIP: 0010:rb_erase+0x306/0x3710 [ 36.169044] 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 [ 36.187957] RSP: 0018:ffff8801d8ade918 EFLAGS: 00010202 [ 36.193307] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 36.200557] RDX: 1ffff1003b15bd2b RSI: ffffffff8af92020 RDI: 0000000000000008 [ 36.207810] RBP: ffff8801d8adf320 R08: dffffc0000000000 R09: ffffed003b15be53 [ 36.215063] R10: ffffed003b15be53 R11: 0000000000000003 R12: ffff8801c401f230 [ 36.222312] R13: dffffc0000000000 R14: ffff8801d8adf2f8 R15: ffff8801d8adf438 [ 36.229596] FS: 0000000000801880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 36.237814] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.243683] CR2: 00000000200000c0 CR3: 00000001d8a92000 CR4: 00000000001406f0 [ 36.250962] Call Trace: [ 36.253539] ? modules_open+0xa0/0xa0 [ 36.257328] ? rb_insert_color+0x1460/0x1460 [ 36.261721] ? noop_count+0x40/0x40 [ 36.265506] ? print_bfs_bug+0x80/0x80 [ 36.269380] ? mark_held_locks+0x130/0x130 [ 36.273607] ? kernel_text_address+0x79/0xf0 [ 36.277996] ? noop_count+0x40/0x40 [ 36.281607] ? print_bfs_bug+0x80/0x80 [ 36.285478] ? noop_count+0x40/0x40 [ 36.289089] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.294615] ? check_usage_forwards+0x3d0/0x3d0 [ 36.299265] ? __bfs+0x321/0x780 [ 36.302616] ? check_usage+0x1aa/0x790 [ 36.306501] ? print_bfs_bug+0x80/0x80 [ 36.310377] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 36.315291] ? check_usage_forwards+0x3d0/0x3d0 [ 36.319962] ? kasan_check_read+0x11/0x20 [ 36.324104] ? graph_lock+0x9c/0x270 [ 36.327812] ? __bfs+0x321/0x780 [ 36.331162] ? trace_event_raw_event_lock_acquire+0x440/0x440 [ 36.337044] ? lockdep_on+0x50/0x50 [ 36.340653] ? print_bfs_bug+0x80/0x80 [ 36.344527] ? kasan_check_read+0x11/0x20 [ 36.348658] ? graph_lock+0x9c/0x270 [ 36.352353] ? trace_event_raw_event_lock_acquire+0x440/0x440 [ 36.358227] ? mark_held_locks+0x130/0x130 [ 36.362446] ? kasan_check_read+0x11/0x20 [ 36.366578] ? __lock_acquire+0x2aff/0x4c20 [ 36.370886] ? mark_held_locks+0x130/0x130 [ 36.375104] ? print_usage_bug+0xc0/0xc0 [ 36.379147] ? print_usage_bug+0xc0/0xc0 [ 36.383188] ? __lock_acquire+0x62f/0x4c20 [ 36.387418] ? zap_class+0x640/0x640 [ 36.391113] ? print_usage_bug+0xc0/0xc0 [ 36.395159] ? __lock_acquire+0x62f/0x4c20 [ 36.399380] ? mark_held_locks+0x130/0x130 [ 36.403596] ? lock_downgrade+0x900/0x900 [ 36.407732] ? ext4_es_scan+0x960/0x960 [ 36.411693] ? kasan_check_read+0x11/0x20 [ 36.415824] ? do_raw_write_lock+0x14f/0x310 [ 36.420233] ? do_raw_write_trylock+0x270/0x270 [ 36.424890] ? lock_acquire+0x1ed/0x520 [ 36.428850] ? integrity_inode_free+0x77/0x320 [ 36.433421] ? ext4_es_remove_extent+0x151/0x500 [ 36.438161] ? kasan_check_read+0x11/0x20 [ 36.442292] ? do_raw_write_lock+0x14f/0x310 [ 36.446690] ? do_raw_read_unlock+0x70/0x70 [ 36.451007] ? zap_class+0x640/0x640 [ 36.454717] integrity_inode_free+0x12f/0x320 [ 36.459199] security_inode_free+0x19/0x90 [ 36.463423] __destroy_inode+0x328/0x820 [ 36.467467] ? clear_nlink+0xe0/0xe0 [ 36.471162] ? evict+0x5d8/0x980 [ 36.474513] ? lock_downgrade+0x900/0x900 [ 36.478643] ? __inode_wait_for_writeback+0x2cf/0x380 [ 36.483823] destroy_inode+0xda/0x200 [ 36.487607] ? __destroy_inode+0x820/0x820 [ 36.491827] evict+0x5e0/0x980 [ 36.495008] ? destroy_inode+0x200/0x200 [ 36.499053] ? iput+0x671/0xa90 [ 36.502318] ? lock_downgrade+0x900/0x900 [ 36.506455] ? kasan_check_read+0x11/0x20 [ 36.510590] ? do_raw_spin_trylock+0x270/0x270 [ 36.515158] ? lock_downgrade+0x900/0x900 [ 36.519304] iput+0x679/0xa90 [ 36.522414] ? inode_add_lru+0x2a0/0x2a0 [ 36.526464] ? up_write+0x7b/0x220 [ 36.529989] ? down_write_nested+0x130/0x130 [ 36.534381] ? down_write_nested+0x130/0x130 [ 36.538779] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.544302] ? check_preemption_disabled+0x48/0x280 [ 36.549645] ext4_ioctl+0x236f/0x4210 [ 36.553452] ? is_bpf_text_address+0xac/0x170 [ 36.557933] ? ext4_ioctl_group_add+0x560/0x560 [ 36.562593] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 36.567508] ? kasan_check_read+0x11/0x20 [ 36.571652] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 36.576913] ? rcu_softirq_qs+0x20/0x20 [ 36.580877] ? rcu_softirq_qs+0x20/0x20 [ 36.584832] ? unwind_dump+0x190/0x190 [ 36.588732] ? is_bpf_text_address+0xd3/0x170 [ 36.593230] ? kernel_text_address+0x79/0xf0 [ 36.597635] ? __kernel_text_address+0xd/0x40 [ 36.602140] ? unwind_get_return_address+0x61/0xa0 [ 36.607058] ? __save_stack_trace+0x8d/0xf0 [ 36.611371] ? save_stack+0xa9/0xd0 [ 36.614985] ? save_stack+0x43/0xd0 [ 36.618610] ? __kasan_slab_free+0x102/0x150 [ 36.623001] ? kasan_slab_free+0xe/0x10 [ 36.626965] ? kmem_cache_free+0x83/0x290 [ 36.631095] ? putname+0xf2/0x130 [ 36.634534] ? do_sys_open+0x54d/0x700 [ 36.638406] ? __x64_sys_openat+0x9d/0x100 [ 36.642622] ? do_syscall_64+0x1b9/0x820 [ 36.646668] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.652015] ? trace_hardirqs_off+0xb8/0x310 [ 36.656423] ? kasan_check_read+0x11/0x20 [ 36.660745] ? do_raw_spin_unlock+0xa7/0x330 [ 36.665138] ? trace_hardirqs_on+0x310/0x310 [ 36.669529] ? trace_hardirqs_off+0xb8/0x310 [ 36.673923] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.679451] ? ext4_ioctl_group_add+0x560/0x560 [ 36.684117] do_vfs_ioctl+0x1de/0x1720 [ 36.687993] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 36.693515] ? ioctl_preallocate+0x300/0x300 [ 36.697904] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.703439] ? __fget_light+0x2e9/0x430 [ 36.707397] ? fget_raw+0x20/0x20 [ 36.710831] ? putname+0xf2/0x130 [ 36.714271] ? rcu_read_lock_sched_held+0x14f/0x180 [ 36.719268] ? kmem_cache_free+0x24f/0x290 [ 36.723489] ? putname+0xf7/0x130 [ 36.726927] ? do_syscall_64+0x9a/0x820 [ 36.730887] ? do_syscall_64+0x9a/0x820 [ 36.734846] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 36.739419] ? security_file_ioctl+0x94/0xc0 [ 36.743816] ksys_ioctl+0xa9/0xd0 [ 36.747270] __x64_sys_ioctl+0x73/0xb0 [ 36.751142] do_syscall_64+0x1b9/0x820 [ 36.755016] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.760364] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.765278] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.770102] ? trace_hardirqs_on_caller+0x310/0x310 [ 36.775106] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.780106] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.785118] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.789954] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.795128] RIP: 0033:0x440019 [ 36.798321] 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 [ 36.817217] RSP: 002b:00007fff1702be58 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 36.824914] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440019 [ 36.832200] RDX: 0000000000440019 RSI: 0000000000006611 RDI: 0000000000000003 [ 36.839488] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 36.846743] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018a0 [ 36.853997] R13: 0000000000401930 R14: 0000000000000000 R15: 0000000000000000 [ 36.861268] Modules linked in: [ 36.864567] ---[ end trace 567aeeacb7f423e4 ]--- [ 36.869350] RIP: 0010:rb_erase+0x306/0x3710 [ 36.873719] 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 [ 36.892674] RSP: 0018:ffff8801d8ade918 EFLAGS: 00010202 [ 36.898072] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 36.905366] RDX: 1ffff1003b15bd2b RSI: ffffffff8af92020 RDI: 0000000000000008 [ 36.912626] RBP: ffff8801d8adf320 R08: dffffc0000000000 R09: ffffed003b15be53 [ 36.919962] R10: ffffed003b15be53 R11: 0000000000000003 R12: ffff8801c401f230 [ 36.927265] R13: dffffc0000000000 R14: ffff8801d8adf2f8 R15: ffff8801d8adf438 [ 36.934559] FS: 0000000000801880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 36.942787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.948706] CR2: 00000000200000c0 CR3: 00000001d8a92000 CR4: 00000000001406f0 [ 36.956004] Kernel panic - not syncing: Fatal exception [ 36.962163] Kernel Offset: disabled [ 36.965785] Rebooting in 86400 seconds..