[....] 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. [ 26.999967] kauditd_printk_skb: 7 callbacks suppressed [ 26.999979] audit: type=1800 audit(1540261259.967:29): pid=5237 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.025800] audit: type=1800 audit(1540261259.967:30): pid=5237 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 '10.128.10.35' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.172186] kasan: CONFIG_KASAN_INLINE enabled [ 47.176923] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.184279] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.190496] CPU: 1 PID: 5393 Comm: syz-executor991 Not tainted 4.19.0+ #74 [ 47.197500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.206845] RIP: 0010:rb_erase+0x306/0x3710 [ 47.211156] 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 [ 47.230066] RSP: 0018:ffff8801d7d06918 EFLAGS: 00010202 [ 47.235411] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.242676] RDX: 1ffff1003afa0d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 47.249930] RBP: ffff8801d7d07320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 47.257230] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6b16970 [ 47.264486] R13: dffffc0000000000 R14: ffff8801d7d072f8 R15: ffff8801d7d07438 [ 47.271741] FS: 0000000000920880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 47.279954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.285819] CR2: 0000000020000080 CR3: 00000001d7dcb000 CR4: 00000000001406e0 [ 47.293068] Call Trace: [ 47.295643] ? lockdep_on+0x50/0x50 [ 47.299271] ? rb_insert_color+0x1460/0x1460 [ 47.303664] ? lock_downgrade+0x900/0x900 [ 47.307795] ? noop_count+0x40/0x40 [ 47.311407] ? lock_pin_lock+0x350/0x350 [ 47.315459] ? rcu_bh_qs+0xc0/0xc0 [ 47.318985] ? unwind_dump+0x190/0x190 [ 47.322878] ? kasan_check_read+0x11/0x20 [ 47.327028] ? noop_count+0x40/0x40 [ 47.330639] ? lock_pin_lock+0x350/0x350 [ 47.334682] ? mark_held_locks+0x130/0x130 [ 47.338904] ? check_usage_forwards+0x3e0/0x3e0 [ 47.343568] ? __bfs+0x385/0x7a0 [ 47.346922] ? check_usage+0x1a9/0x790 [ 47.350792] ? lock_pin_lock+0x350/0x350 [ 47.354851] ? check_usage_forwards+0x3e0/0x3e0 [ 47.359510] ? __bfs+0x385/0x7a0 [ 47.362875] ? modules_open+0xa0/0xa0 [ 47.366686] ? lockdep_on+0x50/0x50 [ 47.370311] ? lock_pin_lock+0x350/0x350 [ 47.374360] ? mark_held_locks+0x130/0x130 [ 47.378581] ? kasan_check_read+0x11/0x20 [ 47.382714] ? __lock_acquire+0x2881/0x4ec0 [ 47.387025] ? mark_held_locks+0x130/0x130 [ 47.391243] ? print_usage_bug+0xc0/0xc0 [ 47.395289] ? _raw_spin_unlock+0x2c/0x50 [ 47.399422] ? graph_lock+0x170/0x170 [ 47.403214] ? ext4_exit_mballoc+0xc0/0xc0 [ 47.407434] ? __lock_acquire+0x7ec/0x4ec0 [ 47.411660] ? find_held_lock+0x36/0x1c0 [ 47.415707] ? mark_held_locks+0x130/0x130 [ 47.419926] ? lock_downgrade+0x900/0x900 [ 47.424056] ? ext4_es_scan+0x960/0x960 [ 47.428013] ? lock_release+0x970/0x970 [ 47.431974] ? do_raw_write_trylock+0x1c0/0x1c0 [ 47.436631] ? kasan_check_write+0x14/0x20 [ 47.440852] ? lock_acquire+0x1ed/0x520 [ 47.444810] ? integrity_inode_free+0x77/0x320 [ 47.449392] ? ext4_es_remove_extent+0x151/0x500 [ 47.454138] ? lock_release+0x970/0x970 [ 47.458100] ? kasan_check_write+0x14/0x20 [ 47.462317] ? do_raw_write_lock+0xbd/0x1e0 [ 47.466624] integrity_inode_free+0x12f/0x320 [ 47.471103] security_inode_free+0x19/0x90 [ 47.475323] __destroy_inode+0x328/0x820 [ 47.479369] ? generic_update_time+0x450/0x450 [ 47.483934] ? evict+0x5d8/0x980 [ 47.487289] ? lock_downgrade+0x900/0x900 [ 47.491418] ? __inode_wait_for_writeback+0x2cf/0x380 [ 47.496593] destroy_inode+0xda/0x200 [ 47.500374] ? __destroy_inode+0x820/0x820 [ 47.504591] ? kasan_check_write+0x14/0x20 [ 47.508821] ? do_raw_spin_lock+0xc1/0x230 [ 47.513043] evict+0x5e0/0x980 [ 47.516224] ? destroy_inode+0x200/0x200 [ 47.520282] ? iput+0x671/0xa90 [ 47.523557] ? lock_downgrade+0x900/0x900 [ 47.527710] ? kasan_check_read+0x11/0x20 [ 47.531846] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.536413] ? lock_downgrade+0x900/0x900 [ 47.540546] iput+0x679/0xa90 [ 47.543634] ? inode_add_lru+0x2a0/0x2a0 [ 47.547680] ? up_write+0x7b/0x220 [ 47.551201] ? up_read+0x110/0x110 [ 47.554728] ? up_read+0x110/0x110 [ 47.558251] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.563773] ? check_preemption_disabled+0x48/0x280 [ 47.568783] ext4_ioctl+0x236f/0x4210 [ 47.572582] ? is_bpf_text_address+0xac/0x170 [ 47.577063] ? ext4_ioctl_group_add+0x560/0x560 [ 47.581733] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.587977] ? kasan_check_read+0x11/0x20 [ 47.592110] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.597373] ? rcu_bh_qs+0xc0/0xc0 [ 47.600900] ? rcu_bh_qs+0xc0/0xc0 [ 47.604433] ? unwind_dump+0x190/0x190 [ 47.608316] ? is_bpf_text_address+0xd3/0x170 [ 47.612897] ? kernel_text_address+0x79/0xf0 [ 47.617289] ? __kernel_text_address+0xd/0x40 [ 47.621772] ? unwind_get_return_address+0x61/0xa0 [ 47.626688] ? __save_stack_trace+0x8d/0xf0 [ 47.631002] ? save_stack+0xa9/0xd0 [ 47.634609] ? save_stack+0x43/0xd0 [ 47.638240] ? __kasan_slab_free+0x102/0x150 [ 47.642630] ? kasan_slab_free+0xe/0x10 [ 47.646591] ? kmem_cache_free+0x83/0x290 [ 47.650723] ? putname+0xf2/0x130 [ 47.654158] ? do_sys_open+0x54d/0x700 [ 47.658047] ? __x64_sys_openat+0x9d/0x100 [ 47.662279] ? do_syscall_64+0x1b9/0x820 [ 47.666332] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.671679] ? trace_hardirqs_off+0xb8/0x310 [ 47.676072] ? kasan_check_read+0x11/0x20 [ 47.680203] ? do_raw_spin_unlock+0xa7/0x330 [ 47.684600] ? trace_hardirqs_on+0x310/0x310 [ 47.689009] ? kasan_check_write+0x14/0x20 [ 47.693234] ? trace_hardirqs_off+0xb8/0x310 [ 47.697629] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.703151] ? check_preemption_disabled+0x48/0x280 [ 47.708152] ? check_preemption_disabled+0x48/0x280 [ 47.713153] ? ext4_ioctl_group_add+0x560/0x560 [ 47.717809] do_vfs_ioctl+0x1de/0x1720 [ 47.721680] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.726943] ? ioctl_preallocate+0x300/0x300 [ 47.731329] ? memset+0x31/0x40 [ 47.734590] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.740128] ? smack_file_ioctl+0x210/0x3c0 [ 47.744434] ? fget_raw+0x20/0x20 [ 47.747876] ? smack_file_lock+0x2e0/0x2e0 [ 47.752095] ? do_syscall_64+0x9a/0x820 [ 47.756073] ? do_syscall_64+0x9a/0x820 [ 47.760036] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.765556] ? security_file_ioctl+0x94/0xc0 [ 47.769953] ksys_ioctl+0xa9/0xd0 [ 47.773391] __x64_sys_ioctl+0x73/0xb0 [ 47.777267] do_syscall_64+0x1b9/0x820 [ 47.781140] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 47.786488] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.791402] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.796231] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.801228] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.806257] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.811261] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.816092] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.821261] RIP: 0033:0x440009 [ 47.824458] 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 [ 47.843362] RSP: 002b:00007ffd10379f68 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 47.851052] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 47.858302] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 47.865563] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 47.872815] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 47.880068] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 47.887323] Modules linked in: [ 47.890607] ---[ end trace 665d280b4b471116 ]--- [ 47.895418] RIP: 0010:rb_erase+0x306/0x3710 [ 47.899756] 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 [ 47.918752] RSP: 0018:ffff8801d7d06918 EFLAGS: 00010202 [ 47.924119] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.931466] RDX: 1ffff1003afa0d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 47.938827] RBP: ffff8801d7d07320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 47.946122] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6b16970 [ 47.953396] R13: dffffc0000000000 R14: ffff8801d7d072f8 R15: ffff8801d7d07438 [ 47.960698] FS: 0000000000920880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 47.968954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.974880] CR2: 0000000020000080 CR3: 00000001d7dcb000 CR4: 00000000001406e0 [ 47.982164] Kernel panic - not syncing: Fatal exception [ 47.988359] Kernel Offset: disabled [ 47.991982] Rebooting in 86400 seconds..