[....] 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. [ 27.110853] kauditd_printk_skb: 8 callbacks suppressed [ 27.110864] audit: type=1800 audit(1540211706.374:29): pid=5208 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 [ 27.138430] audit: type=1800 audit(1540211706.374:30): pid=5208 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 syzkaller login: [ 48.465890] sshd (5351) used greatest stack depth: 15976 bytes left Warning: Permanently added '10.128.0.94' (ECDSA) to the list of known hosts. executing program [ 54.999944] kasan: CONFIG_KASAN_INLINE enabled [ 55.004679] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 55.012046] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 55.018271] CPU: 1 PID: 5365 Comm: syz-executor113 Not tainted 4.19.0-rc8+ #271 [ 55.025701] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.035120] RIP: 0010:rb_erase+0x306/0x3710 [ 55.039438] 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 [ 55.058336] RSP: 0018:ffff8801beeee918 EFLAGS: 00010202 [ 55.063685] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 55.070947] RDX: 1ffff10037dddd2b RSI: ffffffff8afc5020 RDI: 0000000000000008 [ 55.078210] RBP: ffff8801beeef320 R08: dffffc0000000000 R09: fffffbfff12d68e0 [ 55.085470] R10: fffffbfff12d68e0 R11: ffffffff896b4703 R12: ffff8801b76c6970 [ 55.092818] R13: dffffc0000000000 R14: ffff8801beeef2f8 R15: ffff8801beeef438 [ 55.100083] FS: 0000000001d8c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 55.108341] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.114256] CR2: 0000000020000080 CR3: 00000001bb350000 CR4: 00000000001406e0 [ 55.121522] Call Trace: [ 55.124098] ? lockdep_on+0x50/0x50 [ 55.127710] ? rb_insert_color+0x1460/0x1460 [ 55.132113] ? lock_downgrade+0x900/0x900 [ 55.136318] ? noop_count+0x40/0x40 [ 55.139954] ? lock_pin_lock+0x350/0x350 [ 55.144079] ? rcu_bh_qs+0xc0/0xc0 [ 55.147623] ? unwind_dump+0x190/0x190 [ 55.151510] ? kasan_check_read+0x11/0x20 [ 55.155652] ? noop_count+0x40/0x40 [ 55.159327] ? lock_pin_lock+0x350/0x350 [ 55.163380] ? mark_held_locks+0x130/0x130 [ 55.167597] ? check_usage_forwards+0x3e0/0x3e0 [ 55.172254] ? __bfs+0x385/0x7a0 [ 55.175613] ? check_usage+0x1a9/0x790 [ 55.179504] ? lock_pin_lock+0x350/0x350 [ 55.183616] ? check_usage_forwards+0x3e0/0x3e0 [ 55.188280] ? __bfs+0x385/0x7a0 [ 55.191639] ? modules_open+0xa0/0xa0 [ 55.195428] ? lockdep_on+0x50/0x50 [ 55.199044] ? lock_pin_lock+0x350/0x350 [ 55.203090] ? mark_held_locks+0x130/0x130 [ 55.207317] ? kasan_check_read+0x11/0x20 [ 55.211453] ? __lock_acquire+0x2881/0x4ec0 [ 55.215760] ? mark_held_locks+0x130/0x130 [ 55.219980] ? print_usage_bug+0xc0/0xc0 [ 55.224035] ? _raw_spin_unlock+0x2c/0x50 [ 55.228171] ? graph_lock+0x170/0x170 [ 55.231960] ? ext4_exit_mballoc+0xc0/0xc0 [ 55.236184] ? __lock_acquire+0x7ec/0x4ec0 [ 55.240404] ? find_held_lock+0x36/0x1c0 [ 55.244512] ? mark_held_locks+0x130/0x130 [ 55.248742] ? lock_downgrade+0x900/0x900 [ 55.252876] ? ext4_es_scan+0x960/0x960 [ 55.256832] ? lock_release+0x970/0x970 [ 55.260787] ? do_raw_write_trylock+0x1c0/0x1c0 [ 55.265442] ? kasan_check_write+0x14/0x20 [ 55.269662] ? lock_acquire+0x1ed/0x520 [ 55.273619] ? integrity_inode_free+0x77/0x320 [ 55.278185] ? ext4_es_remove_extent+0x151/0x500 [ 55.282926] ? lock_release+0x970/0x970 [ 55.286891] ? kasan_check_write+0x14/0x20 [ 55.291111] ? do_raw_write_lock+0xbd/0x1e0 [ 55.295415] integrity_inode_free+0x12f/0x320 [ 55.299895] security_inode_free+0x19/0x90 [ 55.304119] __destroy_inode+0x328/0x820 [ 55.308165] ? generic_update_time+0x450/0x450 [ 55.312792] ? evict+0x5d8/0x980 [ 55.316149] ? lock_downgrade+0x900/0x900 [ 55.320278] ? __inode_wait_for_writeback+0x2cf/0x380 [ 55.325450] destroy_inode+0xda/0x200 [ 55.329232] ? __destroy_inode+0x820/0x820 [ 55.333451] ? kasan_check_write+0x14/0x20 [ 55.337672] ? do_raw_spin_lock+0xc1/0x230 [ 55.341893] evict+0x5e0/0x980 [ 55.345069] ? destroy_inode+0x200/0x200 [ 55.349179] ? iput+0x671/0xa90 [ 55.352459] ? lock_downgrade+0x900/0x900 [ 55.356597] ? kasan_check_read+0x11/0x20 [ 55.360735] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 55.365295] ? lock_downgrade+0x900/0x900 [ 55.369426] iput+0x679/0xa90 [ 55.372512] ? inode_add_lru+0x2a0/0x2a0 [ 55.376599] ? up_write+0x7b/0x220 [ 55.380125] ? up_read+0x110/0x110 [ 55.383642] ? up_read+0x110/0x110 [ 55.387165] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.392685] ? check_preemption_disabled+0x48/0x280 [ 55.397691] ext4_ioctl+0x236f/0x4210 [ 55.401484] ? is_bpf_text_address+0xac/0x170 [ 55.405971] ? ext4_ioctl_group_add+0x560/0x560 [ 55.410630] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 55.416410] ? kasan_check_read+0x11/0x20 [ 55.420538] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 55.425795] ? rcu_bh_qs+0xc0/0xc0 [ 55.429318] ? rcu_bh_qs+0xc0/0xc0 [ 55.432841] ? unwind_dump+0x190/0x190 [ 55.436711] ? is_bpf_text_address+0xd3/0x170 [ 55.441188] ? kernel_text_address+0x79/0xf0 [ 55.445576] ? __kernel_text_address+0xd/0x40 [ 55.450052] ? unwind_get_return_address+0x61/0xa0 [ 55.455074] ? __save_stack_trace+0x8d/0xf0 [ 55.459386] ? save_stack+0xa9/0xd0 [ 55.462996] ? save_stack+0x43/0xd0 [ 55.466608] ? __kasan_slab_free+0x102/0x150 [ 55.471040] ? kasan_slab_free+0xe/0x10 [ 55.475000] ? kmem_cache_free+0x83/0x290 [ 55.479134] ? putname+0xf2/0x130 [ 55.482572] ? do_sys_open+0x54d/0x700 [ 55.486438] ? __x64_sys_openat+0x9d/0x100 [ 55.490655] ? do_syscall_64+0x1b9/0x820 [ 55.494706] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.500060] ? trace_hardirqs_off+0xb8/0x310 [ 55.504457] ? kasan_check_read+0x11/0x20 [ 55.508591] ? do_raw_spin_unlock+0xa7/0x330 [ 55.512988] ? trace_hardirqs_on+0x310/0x310 [ 55.517383] ? kasan_check_write+0x14/0x20 [ 55.521667] ? trace_hardirqs_off+0xb8/0x310 [ 55.526067] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.531654] ? check_preemption_disabled+0x48/0x280 [ 55.536658] ? check_preemption_disabled+0x48/0x280 [ 55.541659] ? ext4_ioctl_group_add+0x560/0x560 [ 55.546311] do_vfs_ioctl+0x1de/0x1720 [ 55.550188] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 55.555458] ? ioctl_preallocate+0x300/0x300 [ 55.559853] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.565379] ? __fget_light+0x2e9/0x430 [ 55.569408] ? fget_raw+0x20/0x20 [ 55.572849] ? putname+0xf2/0x130 [ 55.576287] ? rcu_read_lock_sched_held+0x108/0x120 [ 55.581287] ? kmem_cache_free+0x24f/0x290 [ 55.585519] ? putname+0xf7/0x130 [ 55.588957] ? do_syscall_64+0x9a/0x820 [ 55.592917] ? do_syscall_64+0x9a/0x820 [ 55.596889] ? lockdep_hardirqs_on+0x421/0x5c0 [ 55.601527] ? security_file_ioctl+0x94/0xc0 [ 55.605942] ksys_ioctl+0xa9/0xd0 [ 55.609394] __x64_sys_ioctl+0x73/0xb0 [ 55.613282] do_syscall_64+0x1b9/0x820 [ 55.617166] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 55.622593] ? syscall_return_slowpath+0x5e0/0x5e0 [ 55.627537] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.632388] ? trace_hardirqs_on_caller+0x310/0x310 [ 55.637471] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 55.642554] ? prepare_exit_to_usermode+0x291/0x3b0 [ 55.647571] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.652402] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.657587] RIP: 0033:0x440009 [ 55.660771] 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 [ 55.679768] RSP: 002b:00007ffd01b210f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 55.687459] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 55.694714] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 55.701964] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 55.709210] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 55.716464] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 55.723720] Modules linked in: [ 55.727044] ---[ end trace 7e092590c373b3f2 ]--- [ 55.731804] RIP: 0010:rb_erase+0x306/0x3710 [ 55.736152] 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 [ 55.755064] RSP: 0018:ffff8801beeee918 EFLAGS: 00010202 [ 55.760547] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 55.767838] RDX: 1ffff10037dddd2b RSI: ffffffff8afc5020 RDI: 0000000000000008 [ 55.775114] RBP: ffff8801beeef320 R08: dffffc0000000000 R09: fffffbfff12d68e0 [ 55.782409] R10: fffffbfff12d68e0 R11: ffffffff896b4703 R12: ffff8801b76c6970 [ 55.789665] R13: dffffc0000000000 R14: ffff8801beeef2f8 R15: ffff8801beeef438 [ 55.796951] FS: 0000000001d8c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 55.805184] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.811051] CR2: 0000000020000080 CR3: 00000001bb350000 CR4: 00000000001406e0 [ 55.818352] Kernel panic - not syncing: Fatal exception [ 55.824593] Kernel Offset: disabled [ 55.828221] Rebooting in 86400 seconds..