[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.995079] audit: type=1800 audit(1539231524.130:25): pid=5674 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 37.014202] audit: type=1800 audit(1539231524.130:26): pid=5674 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.039364] audit: type=1800 audit(1539231524.130:27): pid=5674 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.375718] kasan: CONFIG_KASAN_INLINE enabled [ 48.380457] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.387854] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 48.394096] CPU: 1 PID: 5826 Comm: syz-executor985 Not tainted 4.19.0-rc7+ #276 [ 48.401527] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.410881] RIP: 0010:rb_erase+0x306/0x3710 [ 48.415208] 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 [ 48.434132] RSP: 0018:ffff8801bbf8e918 EFLAGS: 00010202 [ 48.439588] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.446887] RDX: 1ffff100377f1d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 48.454186] RBP: ffff8801bbf8f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 48.461446] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8e4d970 [ 48.468705] R13: dffffc0000000000 R14: ffff8801bbf8f2f8 R15: ffff8801bbf8f438 [ 48.475966] FS: 00000000015ac880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 48.484309] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.490278] CR2: 0000000020000080 CR3: 00000001d59e4000 CR4: 00000000001406e0 [ 48.497541] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.504799] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.512098] Call Trace: [ 48.514687] ? rb_insert_color+0x1460/0x1460 [ 48.519095] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 48.524059] ? lock_downgrade+0x900/0x900 [ 48.528210] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.533996] ? mark_held_locks+0x130/0x130 [ 48.538257] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.543524] ? rcu_bh_qs+0xc0/0xc0 [ 48.547047] ? unwind_dump+0x190/0x190 [ 48.550922] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.556445] ? mark_held_locks+0x130/0x130 [ 48.560778] ? mark_page_accessed+0xcb0/0x2040 [ 48.565349] ? activate_page+0x1040/0x1040 [ 48.569567] ? activate_page+0x1040/0x1040 [ 48.573865] ? mark_held_locks+0x130/0x130 [ 48.578089] ? kasan_kmalloc+0xc7/0xe0 [ 48.581963] ? kmem_cache_alloc_trace+0x152/0x750 [ 48.586791] ? ima_add_digest_entry+0xcb/0x6a0 [ 48.591404] ? ima_add_template_entry+0x466/0x7f0 [ 48.596241] ? ima_store_template+0x224/0x310 [ 48.600726] ? pagecache_get_page+0x2d8/0xf00 [ 48.605222] ? find_get_pages_contig+0x15b0/0x15b0 [ 48.610148] ? is_bpf_text_address+0xac/0x170 [ 48.614635] ? lock_downgrade+0x900/0x900 [ 48.618775] ? mark_held_locks+0x130/0x130 [ 48.623054] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.628851] ? mark_held_locks+0x130/0x130 [ 48.633077] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 48.638430] ? lock_downgrade+0x900/0x900 [ 48.642568] ? kasan_check_read+0x11/0x20 [ 48.646707] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.651104] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.655678] ? mark_held_locks+0x130/0x130 [ 48.659906] ? _raw_spin_unlock+0x2c/0x50 [ 48.664092] ? ext4_discard_preallocations+0x18a/0x13c0 [ 48.669492] ? trace_hardirqs_on+0xbd/0x310 [ 48.673812] ? ext4_exit_mballoc+0xc0/0xc0 [ 48.678044] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.683050] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 48.687796] ? modules_open+0xa0/0xa0 [ 48.691585] ? __es_tree_search.isra.12+0x1ba/0x220 [ 48.696595] ? __es_remove_extent+0x9a3/0xba0 [ 48.701078] ? mark_held_locks+0x130/0x130 [ 48.705404] ? lock_downgrade+0x900/0x900 [ 48.709540] ? ext4_es_scan+0x960/0x960 [ 48.713499] ? lock_release+0x970/0x970 [ 48.717462] ? trace_hardirqs_on+0xbd/0x310 [ 48.721783] ? kasan_check_read+0x11/0x20 [ 48.725918] ? clear_inode+0x114/0x3a0 [ 48.729859] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.734521] ? kasan_check_write+0x14/0x20 [ 48.738749] ? lock_acquire+0x1ed/0x520 [ 48.742718] ? integrity_inode_free+0x77/0x320 [ 48.747296] ? ext4_es_remove_extent+0x151/0x500 [ 48.752037] ? lock_release+0x970/0x970 [ 48.756001] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.761095] ? depot_save_stack+0x292/0x470 [ 48.765407] ? kasan_check_write+0x14/0x20 [ 48.769634] ? do_raw_write_lock+0xbd/0x1b0 [ 48.773952] integrity_inode_free+0x12f/0x320 [ 48.778438] security_inode_free+0x19/0x90 [ 48.782670] __destroy_inode+0x328/0x820 [ 48.786783] ? generic_update_time+0x450/0x450 [ 48.791463] ? evict+0x5d8/0x980 [ 48.794818] ? lock_downgrade+0x900/0x900 [ 48.798950] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.804133] destroy_inode+0xda/0x200 [ 48.807923] ? __destroy_inode+0x820/0x820 [ 48.812144] ? kasan_check_write+0x14/0x20 [ 48.816369] ? do_raw_spin_lock+0xc1/0x200 [ 48.820600] evict+0x5e0/0x980 [ 48.823785] ? jbd2_journal_stop+0x430/0x15d0 [ 48.828313] ? destroy_inode+0x200/0x200 [ 48.832406] ? do_raw_spin_lock+0xc1/0x200 [ 48.836694] ? iput+0x671/0xa90 [ 48.839970] ? lock_downgrade+0x900/0x900 [ 48.844115] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.849644] ? kasan_check_read+0x11/0x20 [ 48.853783] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.858419] ? lock_downgrade+0x900/0x900 [ 48.862559] ? ext4_ioctl+0x231b/0x4210 [ 48.866529] iput+0x679/0xa90 [ 48.869670] ? inode_add_lru+0x2a0/0x2a0 [ 48.873727] ? up_write+0x7b/0x220 [ 48.877324] ? up_read+0x110/0x110 [ 48.880905] ? up_read+0x110/0x110 [ 48.884436] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.889960] ? check_preemption_disabled+0x48/0x200 [ 48.895029] ext4_ioctl+0x236f/0x4210 [ 48.898825] ? is_bpf_text_address+0xac/0x170 [ 48.903368] ? ext4_ioctl_group_add+0x560/0x560 [ 48.908078] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.913871] ? kasan_check_read+0x11/0x20 [ 48.918018] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.923287] ? rcu_bh_qs+0xc0/0xc0 [ 48.926814] ? unwind_dump+0x190/0x190 [ 48.930697] ? is_bpf_text_address+0xd3/0x170 [ 48.935183] ? kernel_text_address+0x79/0xf0 [ 48.939583] ? __kernel_text_address+0xd/0x40 [ 48.944079] ? unwind_get_return_address+0x61/0xa0 [ 48.949003] ? __save_stack_trace+0x8d/0xf0 [ 48.953318] ? save_stack+0xa9/0xd0 [ 48.956933] ? save_stack+0x43/0xd0 [ 48.960543] ? __kasan_slab_free+0x102/0x150 [ 48.964935] ? kasan_slab_free+0xe/0x10 [ 48.968899] ? kmem_cache_free+0x83/0x290 [ 48.973036] ? putname+0xf2/0x130 [ 48.976476] ? do_sys_open+0x54d/0x700 [ 48.980347] ? __x64_sys_openat+0x9d/0x100 [ 48.984567] ? do_syscall_64+0x1b9/0x820 [ 48.988613] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.993963] ? trace_hardirqs_off+0xb8/0x310 [ 48.998356] ? kasan_check_read+0x11/0x20 [ 49.002489] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.006887] ? trace_hardirqs_on+0x310/0x310 [ 49.011281] ? kasan_check_write+0x14/0x20 [ 49.015501] ? trace_hardirqs_off+0xb8/0x310 [ 49.019900] ? trace_hardirqs_on+0x310/0x310 [ 49.024302] ? ext4_ioctl_group_add+0x560/0x560 [ 49.028966] do_vfs_ioctl+0x1de/0x1720 [ 49.032842] ? trace_hardirqs_on+0xbd/0x310 [ 49.037150] ? ioctl_preallocate+0x300/0x300 [ 49.041550] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.047078] ? __fget_light+0x2e9/0x430 [ 49.051044] ? fget_raw+0x20/0x20 [ 49.054593] ? putname+0xf2/0x130 [ 49.058038] ? kmem_cache_free+0x21a/0x290 [ 49.062258] ? putname+0xf7/0x130 [ 49.065705] ? security_file_ioctl+0x94/0xc0 [ 49.070102] ksys_ioctl+0xa9/0xd0 [ 49.073836] __x64_sys_ioctl+0x73/0xb0 [ 49.077724] do_syscall_64+0x1b9/0x820 [ 49.081614] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 49.086966] ? syscall_return_slowpath+0x5e0/0x5e0 [ 49.091885] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.096719] ? trace_hardirqs_on_caller+0x310/0x310 [ 49.101778] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 49.106788] ? prepare_exit_to_usermode+0x291/0x3b0 [ 49.111796] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.116704] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.121947] RIP: 0033:0x440009 [ 49.125138] 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 [ 49.144029] RSP: 002b:00007ffc4c671d68 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 49.151727] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 49.158989] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 49.166327] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 49.173627] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 49.180891] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 49.188150] Modules linked in: [ 49.191487] ---[ end trace dfec2f0c177ff037 ]--- [ 49.196400] RIP: 0010:rb_erase+0x306/0x3710 [ 49.200731] 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 [ 49.219730] RSP: 0018:ffff8801bbf8e918 EFLAGS: 00010202 [ 49.225133] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.232391] RDX: 1ffff100377f1d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 49.239696] RBP: ffff8801bbf8f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 49.246985] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8e4d970 [ 49.254285] R13: dffffc0000000000 R14: ffff8801bbf8f2f8 R15: ffff8801bbf8f438 [ 49.261562] FS: 00000000015ac880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 49.269861] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.275775] CR2: 0000000020000080 CR3: 00000001d59e4000 CR4: 00000000001406e0 [ 49.283170] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.290447] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.297751] Kernel panic - not syncing: Fatal exception [ 49.304101] Kernel Offset: disabled [ 49.307770] Rebooting in 86400 seconds..