[....] 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. [ 26.748490] kauditd_printk_skb: 7 callbacks suppressed [ 26.748502] audit: type=1800 audit(1538394706.770:29): pid=5242 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 [ 26.783084] audit: type=1800 audit(1538394706.770:30): pid=5242 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 '10.128.0.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.717010] kasan: CONFIG_KASAN_INLINE enabled [ 38.721823] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.729270] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.735523] CPU: 0 PID: 5398 Comm: syz-executor009 Not tainted 4.19.0-rc6+ #262 [ 38.742954] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.752299] RIP: 0010:rb_erase+0x306/0x3710 [ 38.756607] 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 [ 38.775498] RSP: 0018:ffff8801cc586918 EFLAGS: 00010202 [ 38.780844] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.788157] RDX: 1ffff100398b0d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 38.795429] RBP: ffff8801cc587320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 38.802698] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b72aa970 [ 38.809963] R13: dffffc0000000000 R14: ffff8801cc5872f8 R15: ffff8801cc587438 [ 38.817217] FS: 0000000002279880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.825447] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.831312] CR2: 0000000020000080 CR3: 00000001d8632000 CR4: 00000000001406f0 [ 38.838566] Call Trace: [ 38.841141] ? lockdep_on+0x50/0x50 [ 38.844755] ? rb_insert_color+0x1460/0x1460 [ 38.849146] ? noop_count+0x40/0x40 [ 38.852756] ? lock_pin_lock+0x350/0x350 [ 38.856799] ? noop_count+0x40/0x40 [ 38.860410] ? kasan_check_read+0x11/0x20 [ 38.864657] ? noop_count+0x40/0x40 [ 38.868274] ? noop_count+0x40/0x40 [ 38.871889] ? lock_pin_lock+0x350/0x350 [ 38.875938] ? mark_held_locks+0x130/0x130 [ 38.880159] ? check_usage_forwards+0x3e0/0x3e0 [ 38.884811] ? __bfs+0x385/0x7a0 [ 38.888159] ? noop_count+0x40/0x40 [ 38.891836] ? check_usage+0x1a9/0x790 [ 38.895715] ? lock_pin_lock+0x350/0x350 [ 38.899807] ? check_usage_forwards+0x3e0/0x3e0 [ 38.904474] ? __bfs+0x385/0x7a0 [ 38.907826] ? __lock_acquire+0x7ec/0x4ec0 [ 38.912043] ? lockdep_on+0x50/0x50 [ 38.915693] ? lock_pin_lock+0x350/0x350 [ 38.919746] ? mark_held_locks+0x130/0x130 [ 38.923969] ? kasan_check_read+0x11/0x20 [ 38.928100] ? __lock_acquire+0x2881/0x4ec0 [ 38.932417] ? mark_held_locks+0x130/0x130 [ 38.936639] ? print_usage_bug+0xc0/0xc0 [ 38.940688] ? _raw_spin_unlock+0x2c/0x50 [ 38.944869] ? graph_lock+0x170/0x170 [ 38.948665] ? ext4_exit_mballoc+0xc0/0xc0 [ 38.952911] ? __lock_acquire+0x7ec/0x4ec0 [ 38.957144] ? find_held_lock+0x36/0x1c0 [ 38.961193] ? mark_held_locks+0x130/0x130 [ 38.965412] ? lock_downgrade+0x900/0x900 [ 38.969543] ? ext4_es_scan+0x960/0x960 [ 38.973513] ? do_raw_write_trylock+0x1c0/0x1c0 [ 38.978173] ? kasan_check_write+0x14/0x20 [ 38.982401] ? lock_acquire+0x1ed/0x520 [ 38.986366] ? integrity_inode_free+0x77/0x320 [ 38.990945] ? ext4_es_remove_extent+0x151/0x500 [ 38.995816] ? lock_release+0x970/0x970 [ 38.999778] ? kasan_check_write+0x14/0x20 [ 39.004000] ? do_raw_write_lock+0xbd/0x1b0 [ 39.008308] integrity_inode_free+0x12f/0x320 [ 39.012792] security_inode_free+0x19/0x90 [ 39.017014] __destroy_inode+0x328/0x820 [ 39.021057] ? generic_update_time+0x450/0x450 [ 39.025725] ? evict+0x5d8/0x980 [ 39.029079] ? lock_downgrade+0x900/0x900 [ 39.033213] ? __inode_wait_for_writeback+0x2cf/0x380 [ 39.038395] destroy_inode+0xda/0x200 [ 39.042179] ? __destroy_inode+0x820/0x820 [ 39.046402] ? kasan_check_write+0x14/0x20 [ 39.050623] ? do_raw_spin_lock+0xc1/0x200 [ 39.054845] evict+0x5e0/0x980 [ 39.058031] ? destroy_inode+0x200/0x200 [ 39.062079] ? iput+0x671/0xa90 [ 39.065346] ? lock_downgrade+0x900/0x900 [ 39.069480] ? kasan_check_read+0x11/0x20 [ 39.073613] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.078245] ? lock_downgrade+0x900/0x900 [ 39.082392] iput+0x679/0xa90 [ 39.085484] ? inode_add_lru+0x2a0/0x2a0 [ 39.089526] ? up_write+0x7b/0x220 [ 39.093050] ? up_read+0x110/0x110 [ 39.096638] ? up_read+0x110/0x110 [ 39.100170] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.105697] ? check_preemption_disabled+0x48/0x200 [ 39.110700] ext4_ioctl+0x236f/0x4210 [ 39.114491] ? is_bpf_text_address+0xac/0x170 [ 39.118972] ? ext4_ioctl_group_add+0x560/0x560 [ 39.123628] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 39.129430] ? kasan_check_read+0x11/0x20 [ 39.133577] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.138842] ? rcu_bh_qs+0xc0/0xc0 [ 39.142365] ? rcu_bh_qs+0xc0/0xc0 [ 39.146048] ? unwind_dump+0x190/0x190 [ 39.149936] ? is_bpf_text_address+0xd3/0x170 [ 39.154426] ? kernel_text_address+0x79/0xf0 [ 39.158880] ? __kernel_text_address+0xd/0x40 [ 39.163371] ? unwind_get_return_address+0x61/0xa0 [ 39.168358] ? __save_stack_trace+0x8d/0xf0 [ 39.172696] ? save_stack+0xa9/0xd0 [ 39.176317] ? save_stack+0x43/0xd0 [ 39.179925] ? __kasan_slab_free+0x102/0x150 [ 39.184316] ? kasan_slab_free+0xe/0x10 [ 39.188282] ? kmem_cache_free+0x83/0x290 [ 39.192415] ? putname+0xf2/0x130 [ 39.195853] ? do_sys_open+0x54d/0x700 [ 39.199974] ? __x64_sys_openat+0x9d/0x100 [ 39.204198] ? do_syscall_64+0x1b9/0x820 [ 39.208246] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.213598] ? trace_hardirqs_off+0xb8/0x310 [ 39.217989] ? kasan_check_read+0x11/0x20 [ 39.222122] ? do_raw_spin_unlock+0xa7/0x2f0 [ 39.226514] ? trace_hardirqs_on+0x310/0x310 [ 39.230909] ? kasan_check_write+0x14/0x20 [ 39.235132] ? trace_hardirqs_off+0xb8/0x310 [ 39.239530] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.245053] ? check_preemption_disabled+0x48/0x200 [ 39.250057] ? check_preemption_disabled+0x48/0x200 [ 39.255061] ? ext4_ioctl_group_add+0x560/0x560 [ 39.259740] do_vfs_ioctl+0x1de/0x1720 [ 39.263615] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.268877] ? ioctl_preallocate+0x300/0x300 [ 39.273274] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.278792] ? __fget_light+0x2e9/0x430 [ 39.282756] ? fget_raw+0x20/0x20 [ 39.286190] ? putname+0xf2/0x130 [ 39.289625] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.294628] ? kmem_cache_free+0x24f/0x290 [ 39.298847] ? putname+0xf7/0x130 [ 39.302288] ? do_syscall_64+0x9a/0x820 [ 39.306245] ? do_syscall_64+0x9a/0x820 [ 39.310204] ? lockdep_hardirqs_on+0x421/0x5c0 [ 39.314775] ? security_file_ioctl+0x94/0xc0 [ 39.319166] ksys_ioctl+0xa9/0xd0 [ 39.322602] __x64_sys_ioctl+0x73/0xb0 [ 39.326520] do_syscall_64+0x1b9/0x820 [ 39.330405] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.335756] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.340666] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.345494] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.350492] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.355493] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.360551] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.365392] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.370562] RIP: 0033:0x440089 [ 39.373743] 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 [ 39.392629] RSP: 002b:00007fff7fb4cee8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 39.400336] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 39.407590] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 39.414846] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.422141] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 39.429405] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 39.436664] Modules linked in: [ 39.439983] ---[ end trace c4f4f44261dca47a ]--- [ 39.444774] RIP: 0010:rb_erase+0x306/0x3710 [ 39.449086] 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 [ 39.468005] RSP: 0018:ffff8801cc586918 EFLAGS: 00010202 [ 39.473397] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.480654] RDX: 1ffff100398b0d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 39.487939] RBP: ffff8801cc587320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 39.495227] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b72aa970 [ 39.502484] R13: dffffc0000000000 R14: ffff8801cc5872f8 R15: ffff8801cc587438 [ 39.509770] FS: 0000000002279880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.518020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.523927] CR2: 0000000020000080 CR3: 00000001d8632000 CR4: 00000000001406f0 [ 39.531200] Kernel panic - not syncing: Fatal exception [ 39.537395] Kernel Offset: disabled [ 39.541020] Rebooting in 86400 seconds..