[....] 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. [ 27.277614] kauditd_printk_skb: 7 callbacks suppressed [ 27.277627] audit: type=1800 audit(1540330623.121:29): pid=5233 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 [ 27.302802] audit: type=1800 audit(1540330623.121:30): pid=5233 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 '10.128.10.38' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.967282] kasan: CONFIG_KASAN_INLINE enabled [ 48.972238] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.979611] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 48.985853] CPU: 1 PID: 5389 Comm: syz-executor785 Not tainted 4.19.0+ #299 [ 48.992941] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.002363] RIP: 0010:rb_erase+0x306/0x3710 [ 49.006679] 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 [ 49.026194] RSP: 0018:ffff8801d929e918 EFLAGS: 00010202 [ 49.031544] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.038809] RDX: 1ffff1003b253d2b RSI: ffffffff8afbf860 RDI: 0000000000000008 [ 49.046071] RBP: ffff8801d929f320 R08: dffffc0000000000 R09: fffffbfff12d69a0 [ 49.053370] R10: fffffbfff12d69a0 R11: ffffffff896b4d03 R12: ffff8801b771c930 [ 49.060635] R13: dffffc0000000000 R14: ffff8801d929f2f8 R15: ffff8801d929f438 [ 49.067900] FS: 0000000001db9880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 49.076112] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.081978] CR2: 0000000020000080 CR3: 00000001d80ed000 CR4: 00000000001406e0 [ 49.089228] Call Trace: [ 49.091801] ? lockdep_on+0x50/0x50 [ 49.095462] ? rb_insert_color+0x1460/0x1460 [ 49.099866] ? lock_downgrade+0x900/0x900 [ 49.104001] ? noop_count+0x40/0x40 [ 49.107612] ? lock_pin_lock+0x350/0x350 [ 49.111664] ? rcu_bh_qs+0xc0/0xc0 [ 49.115234] ? unwind_dump+0x190/0x190 [ 49.119119] ? kasan_check_read+0x11/0x20 [ 49.123257] ? noop_count+0x40/0x40 [ 49.126915] ? lock_pin_lock+0x350/0x350 [ 49.130973] ? mark_held_locks+0x130/0x130 [ 49.135211] ? check_usage_forwards+0x3e0/0x3e0 [ 49.139867] ? __bfs+0x385/0x7a0 [ 49.143292] ? check_usage+0x1a9/0x790 [ 49.147167] ? lock_pin_lock+0x350/0x350 [ 49.151213] ? check_usage_forwards+0x3e0/0x3e0 [ 49.155869] ? __bfs+0x385/0x7a0 [ 49.159230] ? lockdep_on+0x50/0x50 [ 49.162844] ? lock_pin_lock+0x350/0x350 [ 49.166895] ? mark_held_locks+0x130/0x130 [ 49.171119] ? kasan_check_read+0x11/0x20 [ 49.175252] ? __lock_acquire+0x2881/0x4ec0 [ 49.179560] ? mark_held_locks+0x130/0x130 [ 49.183789] ? print_usage_bug+0xc0/0xc0 [ 49.187843] ? _raw_spin_unlock+0x2c/0x50 [ 49.192026] ? graph_lock+0x170/0x170 [ 49.195819] ? ext4_exit_mballoc+0xc0/0xc0 [ 49.200040] ? __lock_acquire+0x7ec/0x4ec0 [ 49.204258] ? find_held_lock+0x36/0x1c0 [ 49.208311] ? mark_held_locks+0x130/0x130 [ 49.212539] ? lock_downgrade+0x900/0x900 [ 49.216675] ? ext4_es_scan+0x960/0x960 [ 49.220634] ? lock_release+0x970/0x970 [ 49.224601] ? do_raw_write_trylock+0x1c0/0x1c0 [ 49.229256] ? kasan_check_write+0x14/0x20 [ 49.233486] ? lock_acquire+0x1ed/0x520 [ 49.237506] ? integrity_inode_free+0x77/0x320 [ 49.242082] ? ext4_es_remove_extent+0x151/0x500 [ 49.246874] ? lock_release+0x970/0x970 [ 49.250846] ? kasan_check_write+0x14/0x20 [ 49.255064] ? do_raw_write_lock+0xbd/0x1e0 [ 49.259379] integrity_inode_free+0x12f/0x320 [ 49.263863] security_inode_free+0x19/0x90 [ 49.268086] __destroy_inode+0x328/0x820 [ 49.272135] ? generic_update_time+0x450/0x450 [ 49.276709] ? evict+0x5d8/0x980 [ 49.280165] ? lock_downgrade+0x900/0x900 [ 49.284302] ? __inode_wait_for_writeback+0x2cf/0x380 [ 49.289477] destroy_inode+0xda/0x200 [ 49.293267] ? __destroy_inode+0x820/0x820 [ 49.297490] ? kasan_check_write+0x14/0x20 [ 49.301708] ? do_raw_spin_lock+0xc1/0x230 [ 49.306003] evict+0x5e0/0x980 [ 49.309186] ? destroy_inode+0x200/0x200 [ 49.313234] ? iput+0x671/0xa90 [ 49.316496] ? lock_downgrade+0x900/0x900 [ 49.320632] ? kasan_check_read+0x11/0x20 [ 49.324770] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.329335] ? lock_downgrade+0x900/0x900 [ 49.333465] iput+0x679/0xa90 [ 49.336553] ? inode_add_lru+0x2a0/0x2a0 [ 49.340644] ? up_write+0x7b/0x220 [ 49.344175] ? up_read+0x110/0x110 [ 49.347870] ? up_read+0x110/0x110 [ 49.351393] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.357012] ? check_preemption_disabled+0x48/0x280 [ 49.362014] ext4_ioctl+0x236f/0x4210 [ 49.365803] ? is_bpf_text_address+0xac/0x170 [ 49.370302] ? ext4_ioctl_group_add+0x560/0x560 [ 49.374960] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.380740] ? kasan_check_read+0x11/0x20 [ 49.384919] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.390185] ? rcu_bh_qs+0xc0/0xc0 [ 49.393710] ? rcu_bh_qs+0xc0/0xc0 [ 49.397230] ? unwind_dump+0x190/0x190 [ 49.401149] ? is_bpf_text_address+0xd3/0x170 [ 49.405640] ? kernel_text_address+0x79/0xf0 [ 49.410047] ? __kernel_text_address+0xd/0x40 [ 49.414529] ? unwind_get_return_address+0x61/0xa0 [ 49.419458] ? __save_stack_trace+0x8d/0xf0 [ 49.423770] ? save_stack+0xa9/0xd0 [ 49.427378] ? save_stack+0x43/0xd0 [ 49.430983] ? __kasan_slab_free+0x102/0x150 [ 49.435422] ? kasan_slab_free+0xe/0x10 [ 49.439388] ? kmem_cache_free+0x83/0x290 [ 49.443521] ? putname+0xf2/0x130 [ 49.446955] ? do_sys_open+0x54d/0x700 [ 49.450835] ? __x64_sys_openat+0x9d/0x100 [ 49.455063] ? do_syscall_64+0x1b9/0x820 [ 49.459111] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.464465] ? trace_hardirqs_off+0xb8/0x310 [ 49.468872] ? kasan_check_read+0x11/0x20 [ 49.473011] ? do_raw_spin_unlock+0xa7/0x330 [ 49.477406] ? trace_hardirqs_on+0x310/0x310 [ 49.481796] ? kasan_check_write+0x14/0x20 [ 49.486057] ? trace_hardirqs_off+0xb8/0x310 [ 49.490456] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.496091] ? check_preemption_disabled+0x48/0x280 [ 49.501093] ? check_preemption_disabled+0x48/0x280 [ 49.506094] ? ext4_ioctl_group_add+0x560/0x560 [ 49.510747] do_vfs_ioctl+0x1de/0x1720 [ 49.514625] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.519885] ? ioctl_preallocate+0x300/0x300 [ 49.524280] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.529802] ? __fget_light+0x2e9/0x430 [ 49.533856] ? fget_raw+0x20/0x20 [ 49.537298] ? putname+0xf2/0x130 [ 49.540739] ? rcu_read_lock_sched_held+0x108/0x120 [ 49.545744] ? kmem_cache_free+0x24f/0x290 [ 49.549973] ? putname+0xf7/0x130 [ 49.553415] ? do_syscall_64+0x9a/0x820 [ 49.557374] ? do_syscall_64+0x9a/0x820 [ 49.561335] ? lockdep_hardirqs_on+0x421/0x5c0 [ 49.565904] ? security_file_ioctl+0x94/0xc0 [ 49.570299] ksys_ioctl+0xa9/0xd0 [ 49.573749] __x64_sys_ioctl+0x73/0xb0 [ 49.577635] do_syscall_64+0x1b9/0x820 [ 49.581514] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 49.586869] ? syscall_return_slowpath+0x5e0/0x5e0 [ 49.591786] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.596611] ? trace_hardirqs_on_caller+0x310/0x310 [ 49.601613] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 49.606618] ? prepare_exit_to_usermode+0x291/0x3b0 [ 49.611626] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.616565] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.621745] RIP: 0033:0x440009 [ 49.624930] 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 [ 49.643821] RSP: 002b:00007ffec34a73d8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 49.651558] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 49.658830] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 49.666088] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 49.673344] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 49.680597] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 49.687863] Modules linked in: [ 49.691173] ---[ end trace 04ba2d08c35192b8 ]--- [ 49.695931] RIP: 0010:rb_erase+0x306/0x3710 [ 49.700235] 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 [ 49.719187] RSP: 0018:ffff8801d929e918 EFLAGS: 00010202 [ 49.724568] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.731935] RDX: 1ffff1003b253d2b RSI: ffffffff8afbf860 RDI: 0000000000000008 [ 49.739200] RBP: ffff8801d929f320 R08: dffffc0000000000 R09: fffffbfff12d69a0 [ 49.746499] R10: fffffbfff12d69a0 R11: ffffffff896b4d03 R12: ffff8801b771c930 [ 49.753789] R13: dffffc0000000000 R14: ffff8801d929f2f8 R15: ffff8801d929f438 [ 49.761179] FS: 0000000001db9880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 49.769394] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.775342] CR2: 0000000020000080 CR3: 00000001d80ed000 CR4: 00000000001406e0 [ 49.782635] Kernel panic - not syncing: Fatal exception [ 49.788809] Kernel Offset: disabled [ 49.792433] Rebooting in 86400 seconds..