[....] 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. [ 26.995134] kauditd_printk_skb: 7 callbacks suppressed [ 26.995146] audit: type=1800 audit(1538600504.953:29): pid=5246 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 [ 27.021521] audit: type=1800 audit(1538600504.963:30): pid=5246 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 '10.128.10.13' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.430096] kasan: CONFIG_KASAN_INLINE enabled [ 38.434768] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.442224] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.448468] CPU: 0 PID: 5402 Comm: syz-executor751 Not tainted 4.19.0-rc6+ #265 [ 38.455890] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.465244] RIP: 0010:rb_erase+0x306/0x3710 [ 38.469548] 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 [ 38.488451] RSP: 0018:ffff8801bdfb6918 EFLAGS: 00010202 [ 38.493798] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.501046] RDX: 1ffff10037bf6d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 38.508293] RBP: ffff8801bdfb7320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 38.515541] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b738f1f0 [ 38.522792] R13: dffffc0000000000 R14: ffff8801bdfb72f8 R15: ffff8801bdfb7438 [ 38.530044] FS: 00000000023a5880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.538248] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.544112] CR2: 0000000020000700 CR3: 00000001d8f74000 CR4: 00000000001406f0 [ 38.551376] Call Trace: [ 38.553947] ? lockdep_on+0x50/0x50 [ 38.557759] ? rb_insert_color+0x1460/0x1460 [ 38.562150] ? noop_count+0x40/0x40 [ 38.565757] ? lock_pin_lock+0x350/0x350 [ 38.569800] ? noop_count+0x40/0x40 [ 38.573419] ? kasan_check_read+0x11/0x20 [ 38.577557] ? noop_count+0x40/0x40 [ 38.581166] ? noop_count+0x40/0x40 [ 38.584771] ? lock_pin_lock+0x350/0x350 [ 38.588812] ? mark_held_locks+0x130/0x130 [ 38.593026] ? check_usage_forwards+0x3e0/0x3e0 [ 38.597672] ? __bfs+0x385/0x7a0 [ 38.601017] ? noop_count+0x40/0x40 [ 38.604626] ? check_usage+0x1a9/0x790 [ 38.608497] ? lock_pin_lock+0x350/0x350 [ 38.612544] ? check_usage_forwards+0x3e0/0x3e0 [ 38.617211] ? __bfs+0x385/0x7a0 [ 38.620562] ? __lock_acquire+0x7ec/0x4ec0 [ 38.624776] ? lockdep_on+0x50/0x50 [ 38.628381] ? lock_pin_lock+0x350/0x350 [ 38.632432] ? mark_held_locks+0x130/0x130 [ 38.636667] ? kasan_check_read+0x11/0x20 [ 38.640808] ? __lock_acquire+0x2881/0x4ec0 [ 38.645112] ? mark_held_locks+0x130/0x130 [ 38.649328] ? print_usage_bug+0xc0/0xc0 [ 38.653371] ? _raw_spin_unlock+0x2c/0x50 [ 38.657498] ? graph_lock+0x170/0x170 [ 38.661294] ? ext4_exit_mballoc+0xc0/0xc0 [ 38.665511] ? __lock_acquire+0x7ec/0x4ec0 [ 38.669728] ? find_held_lock+0x36/0x1c0 [ 38.673770] ? mark_held_locks+0x130/0x130 [ 38.677983] ? lock_downgrade+0x900/0x900 [ 38.682116] ? ext4_es_scan+0x960/0x960 [ 38.686073] ? lock_release+0x970/0x970 [ 38.690033] ? do_raw_write_trylock+0x1c0/0x1c0 [ 38.694709] ? kasan_check_write+0x14/0x20 [ 38.698935] ? lock_acquire+0x1ed/0x520 [ 38.702893] ? integrity_inode_free+0x77/0x320 [ 38.707460] ? ext4_es_remove_extent+0x151/0x500 [ 38.712200] ? lock_release+0x970/0x970 [ 38.716160] ? kasan_check_write+0x14/0x20 [ 38.720377] ? do_raw_write_lock+0xbd/0x1b0 [ 38.724690] integrity_inode_free+0x12f/0x320 [ 38.729172] security_inode_free+0x19/0x90 [ 38.733389] __destroy_inode+0x328/0x820 [ 38.737458] ? generic_update_time+0x450/0x450 [ 38.742020] ? evict+0x5d8/0x980 [ 38.745375] ? lock_downgrade+0x900/0x900 [ 38.749519] ? __inode_wait_for_writeback+0x2cf/0x380 [ 38.754707] destroy_inode+0xda/0x200 [ 38.758489] ? __destroy_inode+0x820/0x820 [ 38.762708] ? kasan_check_write+0x14/0x20 [ 38.766921] ? do_raw_spin_lock+0xc1/0x200 [ 38.771139] evict+0x5e0/0x980 [ 38.774314] ? destroy_inode+0x200/0x200 [ 38.778370] ? iput+0x671/0xa90 [ 38.781631] ? lock_downgrade+0x900/0x900 [ 38.785777] ? kasan_check_read+0x11/0x20 [ 38.789909] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.794469] ? lock_downgrade+0x900/0x900 [ 38.798610] iput+0x679/0xa90 [ 38.801698] ? inode_add_lru+0x2a0/0x2a0 [ 38.805738] ? up_write+0x7b/0x220 [ 38.809258] ? up_read+0x110/0x110 [ 38.812778] ? up_read+0x110/0x110 [ 38.816299] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.821819] ? check_preemption_disabled+0x48/0x200 [ 38.826821] ext4_ioctl+0x236f/0x4210 [ 38.830603] ? ext4_ioctl_group_add+0x560/0x560 [ 38.835272] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 38.841047] ? kasan_check_read+0x11/0x20 [ 38.845203] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.850465] ? rcu_bh_qs+0xc0/0xc0 [ 38.853985] ? rcu_bh_qs+0xc0/0xc0 [ 38.857505] ? unwind_dump+0x190/0x190 [ 38.861378] ? is_bpf_text_address+0xd3/0x170 [ 38.865869] ? kernel_text_address+0x79/0xf0 [ 38.870265] ? __kernel_text_address+0xd/0x40 [ 38.874739] ? unwind_get_return_address+0x61/0xa0 [ 38.879651] ? __save_stack_trace+0x8d/0xf0 [ 38.883957] ? save_stack+0xa9/0xd0 [ 38.887562] ? save_stack+0x43/0xd0 [ 38.891168] ? __kasan_slab_free+0x102/0x150 [ 38.895578] ? kasan_slab_free+0xe/0x10 [ 38.899551] ? kmem_cache_free+0x83/0x290 [ 38.903681] ? putname+0xf2/0x130 [ 38.907116] ? do_sys_open+0x54d/0x700 [ 38.910981] ? __x64_sys_open+0x7e/0xc0 [ 38.914940] ? do_syscall_64+0x1b9/0x820 [ 38.918985] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.924331] ? trace_hardirqs_off+0xb8/0x310 [ 38.928733] ? kasan_check_read+0x11/0x20 [ 38.932865] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.937293] ? trace_hardirqs_on+0x310/0x310 [ 38.941683] ? kasan_check_write+0x14/0x20 [ 38.945923] ? trace_hardirqs_off+0xb8/0x310 [ 38.950325] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.955845] ? check_preemption_disabled+0x48/0x200 [ 38.960846] ? ext4_ioctl_group_add+0x560/0x560 [ 38.965496] do_vfs_ioctl+0x1de/0x1720 [ 38.969368] ? rcu_lockdep_current_cpu_online+0x1f0/0x2d0 [ 38.974887] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.980151] ? ioctl_preallocate+0x300/0x300 [ 38.984542] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.990072] ? __fget_light+0x2e9/0x430 [ 38.994025] ? fget_raw+0x20/0x20 [ 38.997457] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.002460] ? kmem_cache_free+0x24f/0x290 [ 39.006678] ? putname+0xf7/0x130 [ 39.010120] ? do_syscall_64+0x9a/0x820 [ 39.014074] ? do_syscall_64+0x9a/0x820 [ 39.018034] ? lockdep_hardirqs_on+0x421/0x5c0 [ 39.022600] ? security_file_ioctl+0x94/0xc0 [ 39.026989] ksys_ioctl+0xa9/0xd0 [ 39.030429] __x64_sys_ioctl+0x73/0xb0 [ 39.034304] do_syscall_64+0x1b9/0x820 [ 39.038171] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.043533] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.048446] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.053275] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.058272] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.063291] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.068289] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.073114] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.078281] RIP: 0033:0x440029 [ 39.081458] 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 [ 39.100341] RSP: 002b:00007ffda7dee218 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 39.108028] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 39.115275] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 39.122525] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.129774] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 39.137024] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 39.144277] Modules linked in: [ 39.147816] ---[ end trace 57dd7151a3e74d2b ]--- [ 39.152604] RIP: 0010:rb_erase+0x306/0x3710 [ 39.156914] 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 [ 39.175825] RSP: 0018:ffff8801bdfb6918 EFLAGS: 00010202 [ 39.181203] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.188468] RDX: 1ffff10037bf6d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 39.195746] RBP: ffff8801bdfb7320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 39.203026] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b738f1f0 [ 39.210309] R13: dffffc0000000000 R14: ffff8801bdfb72f8 R15: ffff8801bdfb7438 [ 39.217576] FS: 00000000023a5880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.225812] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.231705] CR2: 0000000020000700 CR3: 00000001d8f74000 CR4: 00000000001406f0 [ 39.238989] Kernel panic - not syncing: Fatal exception [ 39.245238] Kernel Offset: disabled [ 39.248868] Rebooting in 86400 seconds..