[....] 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. [ 27.144432] kauditd_printk_skb: 7 callbacks suppressed [ 27.144444] audit: type=1800 audit(1540423057.900:29): pid=5231 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.178567] audit: type=1800 audit(1540423057.900:30): pid=5231 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 '10.128.0.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 55.150707] kasan: CONFIG_KASAN_INLINE enabled [ 55.155386] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 55.162868] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 55.169101] CPU: 0 PID: 5389 Comm: syz-executor171 Not tainted 4.19.0+ #78 [ 55.176094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.185444] RIP: 0010:rb_erase+0x306/0x3710 [ 55.189761] 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 [ 55.208663] RSP: 0018:ffff8801bd766918 EFLAGS: 00010202 [ 55.214015] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 55.221273] RDX: 1ffff10037aecd2b RSI: ffffffff8af92020 RDI: 0000000000000008 [ 55.228524] RBP: ffff8801bd767320 R08: dffffc0000000000 R09: ffffed0037aece53 [ 55.235781] R10: ffffed0037aece53 R11: 0000000000000003 R12: ffff8801b6706970 [ 55.243037] R13: dffffc0000000000 R14: ffff8801bd7672f8 R15: ffff8801bd767438 [ 55.250293] FS: 0000000000d12880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 55.258504] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.264371] CR2: 0000000020002000 CR3: 00000001d75e6000 CR4: 00000000001406f0 [ 55.271625] Call Trace: [ 55.274207] ? modules_open+0xa0/0xa0 [ 55.278000] ? rb_insert_color+0x1460/0x1460 [ 55.282395] ? noop_count+0x40/0x40 [ 55.286047] ? print_bfs_bug+0x80/0x80 [ 55.289968] ? mark_held_locks+0x130/0x130 [ 55.294199] ? kernel_text_address+0x79/0xf0 [ 55.298592] ? noop_count+0x40/0x40 [ 55.302206] ? print_bfs_bug+0x80/0x80 [ 55.306088] ? noop_count+0x40/0x40 [ 55.309700] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 55.315230] ? check_usage_forwards+0x3d0/0x3d0 [ 55.319883] ? __bfs+0x321/0x780 [ 55.323251] ? check_usage+0x1aa/0x790 [ 55.327131] ? print_bfs_bug+0x80/0x80 [ 55.331009] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 55.335930] ? check_usage_forwards+0x3d0/0x3d0 [ 55.340586] ? kasan_check_read+0x11/0x20 [ 55.344713] ? graph_lock+0x9c/0x270 [ 55.348404] ? __bfs+0x321/0x780 [ 55.351752] ? trace_event_raw_event_lock_acquire+0x440/0x440 [ 55.357621] ? lockdep_on+0x50/0x50 [ 55.361311] ? print_bfs_bug+0x80/0x80 [ 55.365199] ? kasan_check_read+0x11/0x20 [ 55.369329] ? graph_lock+0x9c/0x270 [ 55.373026] ? trace_event_raw_event_lock_acquire+0x440/0x440 [ 55.378896] ? mark_held_locks+0x130/0x130 [ 55.383117] ? kasan_check_read+0x11/0x20 [ 55.387250] ? __lock_acquire+0x2aff/0x4c20 [ 55.391651] ? mark_held_locks+0x130/0x130 [ 55.395873] ? print_usage_bug+0xc0/0xc0 [ 55.400050] ? print_usage_bug+0xc0/0xc0 [ 55.404095] ? __lock_acquire+0x62f/0x4c20 [ 55.408313] ? zap_class+0x640/0x640 [ 55.412009] ? print_usage_bug+0xc0/0xc0 [ 55.416061] ? __lock_acquire+0x62f/0x4c20 [ 55.420286] ? mark_held_locks+0x130/0x130 [ 55.424501] ? lock_downgrade+0x900/0x900 [ 55.428632] ? ext4_es_scan+0x960/0x960 [ 55.432594] ? kasan_check_read+0x11/0x20 [ 55.436726] ? do_raw_write_lock+0x14f/0x310 [ 55.441116] ? do_raw_write_trylock+0x270/0x270 [ 55.445777] ? lock_acquire+0x1ed/0x520 [ 55.449740] ? integrity_inode_free+0x77/0x320 [ 55.454323] ? ext4_es_remove_extent+0x151/0x500 [ 55.459072] ? kasan_check_read+0x11/0x20 [ 55.463211] ? do_raw_write_lock+0x14f/0x310 [ 55.467608] ? do_raw_read_unlock+0x70/0x70 [ 55.471916] ? zap_class+0x640/0x640 [ 55.475621] integrity_inode_free+0x12f/0x320 [ 55.480108] security_inode_free+0x19/0x90 [ 55.484376] __destroy_inode+0x328/0x820 [ 55.488430] ? clear_nlink+0xe0/0xe0 [ 55.492131] ? evict+0x5d8/0x980 [ 55.495488] ? lock_downgrade+0x900/0x900 [ 55.499625] ? __inode_wait_for_writeback+0x2cf/0x380 [ 55.504804] destroy_inode+0xda/0x200 [ 55.508596] ? __destroy_inode+0x820/0x820 [ 55.512819] evict+0x5e0/0x980 [ 55.516003] ? destroy_inode+0x200/0x200 [ 55.520054] ? iput+0x671/0xa90 [ 55.523322] ? lock_downgrade+0x900/0x900 [ 55.527455] ? kasan_check_read+0x11/0x20 [ 55.531627] ? do_raw_spin_trylock+0x270/0x270 [ 55.536203] ? lock_downgrade+0x900/0x900 [ 55.540342] iput+0x679/0xa90 [ 55.543437] ? inode_add_lru+0x2a0/0x2a0 [ 55.547486] ? up_write+0x7b/0x220 [ 55.551012] ? down_write_nested+0x130/0x130 [ 55.555404] ? down_write_nested+0x130/0x130 [ 55.559802] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.565325] ? check_preemption_disabled+0x48/0x280 [ 55.570328] ext4_ioctl+0x236f/0x4210 [ 55.574113] ? ext4_ioctl_group_add+0x560/0x560 [ 55.578764] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 55.583676] ? kasan_check_read+0x11/0x20 [ 55.587814] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 55.593078] ? rcu_softirq_qs+0x20/0x20 [ 55.597034] ? rcu_softirq_qs+0x20/0x20 [ 55.601001] ? unwind_dump+0x190/0x190 [ 55.604880] ? is_bpf_text_address+0xd3/0x170 [ 55.609362] ? kernel_text_address+0x79/0xf0 [ 55.613759] ? __kernel_text_address+0xd/0x40 [ 55.618241] ? unwind_get_return_address+0x61/0xa0 [ 55.623157] ? __save_stack_trace+0x8d/0xf0 [ 55.627479] ? save_stack+0xa9/0xd0 [ 55.631088] ? save_stack+0x43/0xd0 [ 55.634696] ? __kasan_slab_free+0x102/0x150 [ 55.639083] ? kasan_slab_free+0xe/0x10 [ 55.643037] ? kmem_cache_free+0x83/0x290 [ 55.647177] ? putname+0xf2/0x130 [ 55.650619] ? do_sys_open+0x54d/0x700 [ 55.654492] ? __x64_sys_open+0x7e/0xc0 [ 55.658453] ? do_syscall_64+0x1b9/0x820 [ 55.662505] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.667858] ? trace_hardirqs_off+0xb8/0x310 [ 55.672252] ? kasan_check_read+0x11/0x20 [ 55.676403] ? do_raw_spin_unlock+0xa7/0x330 [ 55.680796] ? trace_hardirqs_on+0x310/0x310 [ 55.685190] ? trace_hardirqs_off+0xb8/0x310 [ 55.689586] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.695113] ? ext4_ioctl_group_add+0x560/0x560 [ 55.699781] do_vfs_ioctl+0x1de/0x1720 [ 55.703670] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 55.709195] ? ioctl_preallocate+0x300/0x300 [ 55.713588] ? memset+0x31/0x40 [ 55.716850] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.722372] ? smack_file_ioctl+0x210/0x3c0 [ 55.726675] ? fget_raw+0x20/0x20 [ 55.730114] ? smack_file_lock+0x2e0/0x2e0 [ 55.734400] ? rcu_read_lock_sched_held+0x14f/0x180 [ 55.739457] ? do_syscall_64+0x9a/0x820 [ 55.743421] ? do_syscall_64+0x9a/0x820 [ 55.747377] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.752901] ? security_file_ioctl+0x94/0xc0 [ 55.757305] ksys_ioctl+0xa9/0xd0 [ 55.760746] __x64_sys_ioctl+0x73/0xb0 [ 55.764625] do_syscall_64+0x1b9/0x820 [ 55.768498] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 55.773849] ? syscall_return_slowpath+0x5e0/0x5e0 [ 55.778762] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.783592] ? trace_hardirqs_on_caller+0x310/0x310 [ 55.788593] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 55.793635] ? prepare_exit_to_usermode+0x291/0x3b0 [ 55.798698] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.803560] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.808734] RIP: 0033:0x43fff9 [ 55.811913] 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 [ 55.830797] RSP: 002b:00007ffd3d39b8b8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 55.838490] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fff9 [ 55.845785] RDX: 000000000043fff9 RSI: 0000000000006611 RDI: 0000000000000003 [ 55.853047] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 55.860300] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401880 [ 55.867556] R13: 0000000000401910 R14: 0000000000000000 R15: 0000000000000000 [ 55.874811] Modules linked in: [ 55.878120] ---[ end trace 191a5bee466fb3eb ]--- [ 55.882923] RIP: 0010:rb_erase+0x306/0x3710 [ 55.887242] 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 [ 55.906172] RSP: 0018:ffff8801bd766918 EFLAGS: 00010202 [ 55.911563] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 55.918816] RDX: 1ffff10037aecd2b RSI: ffffffff8af92020 RDI: 0000000000000008 [ 55.926104] RBP: ffff8801bd767320 R08: dffffc0000000000 R09: ffffed0037aece53 [ 55.933401] R10: ffffed0037aece53 R11: 0000000000000003 R12: ffff8801b6706970 [ 55.940745] R13: dffffc0000000000 R14: ffff8801bd7672f8 R15: ffff8801bd767438 [ 55.948025] FS: 0000000000d12880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 55.956267] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.962174] CR2: 0000000020002000 CR3: 00000001d75e6000 CR4: 00000000001406f0 [ 55.969432] Kernel panic - not syncing: Fatal exception [ 55.975587] Kernel Offset: disabled [ 55.979207] Rebooting in 86400 seconds..