[....] 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. [ 27.117289] kauditd_printk_skb: 8 callbacks suppressed [ 27.117300] audit: type=1800 audit(1538594337.324:29): pid=5236 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.142732] audit: type=1800 audit(1538594337.324:30): pid=5236 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 '10.128.10.57' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.339021] kasan: CONFIG_KASAN_INLINE enabled [ 48.343856] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.351397] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 48.357639] CPU: 1 PID: 5392 Comm: syz-executor807 Not tainted 4.19.0-rc6+ #42 [ 48.365278] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.374834] RIP: 0010:rb_erase+0x306/0x3710 [ 48.379147] 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 [ 48.398153] RSP: 0018:ffff8801bd0a6918 EFLAGS: 00010202 [ 48.403500] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.410761] RDX: 1ffff10037a14d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 48.418019] RBP: ffff8801bd0a7320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 48.425742] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b6b821f0 [ 48.433316] R13: dffffc0000000000 R14: ffff8801bd0a72f8 R15: ffff8801bd0a7438 [ 48.440576] FS: 0000000000b0e880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 48.448786] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.454651] CR2: 0000000020000080 CR3: 00000001baadc000 CR4: 00000000001406e0 [ 48.461903] Call Trace: [ 48.464477] ? lockdep_on+0x50/0x50 [ 48.468118] ? rb_insert_color+0x1460/0x1460 [ 48.472539] ? noop_count+0x40/0x40 [ 48.476151] ? lock_pin_lock+0x350/0x350 [ 48.480207] ? noop_count+0x40/0x40 [ 48.483822] ? kasan_check_read+0x11/0x20 [ 48.487955] ? noop_count+0x40/0x40 [ 48.491568] ? lock_pin_lock+0x350/0x350 [ 48.495613] ? mark_held_locks+0x130/0x130 [ 48.499834] ? check_usage_forwards+0x3e0/0x3e0 [ 48.504493] ? __bfs+0x385/0x7a0 [ 48.507853] ? noop_count+0x40/0x40 [ 48.511471] ? check_usage+0x1a9/0x790 [ 48.515391] ? lock_pin_lock+0x350/0x350 [ 48.519549] ? check_usage_forwards+0x3e0/0x3e0 [ 48.524214] ? __bfs+0x385/0x7a0 [ 48.527564] ? __lock_acquire+0x7ec/0x4ec0 [ 48.531896] ? lockdep_on+0x50/0x50 [ 48.535520] ? lock_pin_lock+0x350/0x350 [ 48.539575] ? mark_held_locks+0x130/0x130 [ 48.543794] ? kasan_check_read+0x11/0x20 [ 48.547929] ? __lock_acquire+0x2881/0x4ec0 [ 48.552245] ? mark_held_locks+0x130/0x130 [ 48.556463] ? print_usage_bug+0xc0/0xc0 [ 48.560529] ? _raw_spin_unlock+0x2c/0x50 [ 48.564669] ? graph_lock+0x170/0x170 [ 48.568457] ? ext4_exit_mballoc+0xc0/0xc0 [ 48.572781] ? __lock_acquire+0x7ec/0x4ec0 [ 48.577010] ? find_held_lock+0x36/0x1c0 [ 48.581065] ? mark_held_locks+0x130/0x130 [ 48.585299] ? lock_downgrade+0x900/0x900 [ 48.589459] ? ext4_es_scan+0x960/0x960 [ 48.593418] ? lock_release+0x970/0x970 [ 48.597378] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.602032] ? kasan_check_write+0x14/0x20 [ 48.606252] ? lock_acquire+0x1ed/0x520 [ 48.610212] ? integrity_inode_free+0x77/0x320 [ 48.614781] ? ext4_es_remove_extent+0x151/0x500 [ 48.619534] ? lock_release+0x970/0x970 [ 48.623496] ? kasan_check_write+0x14/0x20 [ 48.627724] ? do_raw_write_lock+0xbd/0x1b0 [ 48.632034] integrity_inode_free+0x12f/0x320 [ 48.636521] security_inode_free+0x19/0x90 [ 48.640753] __destroy_inode+0x328/0x820 [ 48.644800] ? generic_update_time+0x450/0x450 [ 48.649368] ? evict+0x5d8/0x980 [ 48.652719] ? lock_downgrade+0x900/0x900 [ 48.656862] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.662067] destroy_inode+0xda/0x200 [ 48.665860] ? __destroy_inode+0x820/0x820 [ 48.670091] ? kasan_check_write+0x14/0x20 [ 48.674409] ? do_raw_spin_lock+0xc1/0x200 [ 48.678635] evict+0x5e0/0x980 [ 48.681816] ? destroy_inode+0x200/0x200 [ 48.685862] ? iput+0x671/0xa90 [ 48.689126] ? lock_downgrade+0x900/0x900 [ 48.693258] ? kasan_check_read+0x11/0x20 [ 48.697395] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.702013] ? lock_downgrade+0x900/0x900 [ 48.706156] iput+0x679/0xa90 [ 48.709249] ? inode_add_lru+0x2a0/0x2a0 [ 48.713301] ? up_write+0x7b/0x220 [ 48.716829] ? up_read+0x110/0x110 [ 48.720350] ? up_read+0x110/0x110 [ 48.723876] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.729403] ? check_preemption_disabled+0x48/0x200 [ 48.734412] ext4_ioctl+0x236f/0x4210 [ 48.738199] ? is_bpf_text_address+0xac/0x170 [ 48.742679] ? ext4_ioctl_group_add+0x560/0x560 [ 48.747334] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.753116] ? kasan_check_read+0x11/0x20 [ 48.757251] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.762665] ? rcu_bh_qs+0xc0/0xc0 [ 48.766198] ? rcu_bh_qs+0xc0/0xc0 [ 48.769724] ? unwind_dump+0x190/0x190 [ 48.773610] ? is_bpf_text_address+0xd3/0x170 [ 48.778096] ? kernel_text_address+0x79/0xf0 [ 48.782491] ? __kernel_text_address+0xd/0x40 [ 48.786979] ? unwind_get_return_address+0x61/0xa0 [ 48.791897] ? __save_stack_trace+0x8d/0xf0 [ 48.796207] ? save_stack+0xa9/0xd0 [ 48.799814] ? save_stack+0x43/0xd0 [ 48.803479] ? __kasan_slab_free+0x102/0x150 [ 48.807945] ? kasan_slab_free+0xe/0x10 [ 48.811916] ? kmem_cache_free+0x83/0x290 [ 48.816054] ? putname+0xf2/0x130 [ 48.819491] ? do_sys_open+0x54d/0x700 [ 48.823365] ? __x64_sys_openat+0x9d/0x100 [ 48.827584] ? do_syscall_64+0x1b9/0x820 [ 48.831747] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.837102] ? trace_hardirqs_off+0xb8/0x310 [ 48.841493] ? kasan_check_read+0x11/0x20 [ 48.845643] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.850045] ? trace_hardirqs_on+0x310/0x310 [ 48.854435] ? kasan_check_write+0x14/0x20 [ 48.858653] ? trace_hardirqs_off+0xb8/0x310 [ 48.863046] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.868572] ? check_preemption_disabled+0x48/0x200 [ 48.873648] ? check_preemption_disabled+0x48/0x200 [ 48.878684] ? ext4_ioctl_group_add+0x560/0x560 [ 48.883405] do_vfs_ioctl+0x1de/0x1720 [ 48.887386] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.892663] ? ioctl_preallocate+0x300/0x300 [ 48.897061] ? memset+0x31/0x40 [ 48.900330] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.905860] ? smack_file_ioctl+0x210/0x3c0 [ 48.910170] ? fget_raw+0x20/0x20 [ 48.913613] ? smack_file_lock+0x2e0/0x2e0 [ 48.917840] ? do_syscall_64+0x9a/0x820 [ 48.921798] ? do_syscall_64+0x9a/0x820 [ 48.925760] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.931284] ? security_file_ioctl+0x94/0xc0 [ 48.935688] ksys_ioctl+0xa9/0xd0 [ 48.939133] __x64_sys_ioctl+0x73/0xb0 [ 48.943019] do_syscall_64+0x1b9/0x820 [ 48.946926] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 48.952281] ? syscall_return_slowpath+0x5e0/0x5e0 [ 48.957300] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.962140] ? trace_hardirqs_on_caller+0x310/0x310 [ 48.967149] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 48.972274] ? prepare_exit_to_usermode+0x291/0x3b0 [ 48.977295] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.982127] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.987364] RIP: 0033:0x440009 [ 48.990554] 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 [ 49.009449] RSP: 002b:00007ffd84c4e748 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 49.017219] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 49.024632] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 49.031897] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 49.039222] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 49.046488] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 49.053757] Modules linked in: [ 49.057083] ---[ end trace c59966a9629062fc ]--- [ 49.061860] RIP: 0010:rb_erase+0x306/0x3710 [ 49.066268] 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 [ 49.085356] RSP: 0018:ffff8801bd0a6918 EFLAGS: 00010202 [ 49.090728] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.098143] RDX: 1ffff10037a14d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 49.105460] RBP: ffff8801bd0a7320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 49.112728] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b6b821f0 [ 49.120035] R13: dffffc0000000000 R14: ffff8801bd0a72f8 R15: ffff8801bd0a7438 [ 49.127324] FS: 0000000000b0e880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 49.135573] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.141699] CR2: 0000000020000080 CR3: 00000001baadc000 CR4: 00000000001406e0 [ 49.149000] Kernel panic - not syncing: Fatal exception [ 49.155362] Kernel Offset: disabled [ 49.158989] Rebooting in 86400 seconds..