[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.303239] audit: type=1800 audit(1539041853.221:25): pid=5688 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.341544] audit: type=1800 audit(1539041853.221:26): pid=5688 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.361221] audit: type=1800 audit(1539041853.231:27): pid=5688 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 '10.128.0.48' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.443031] kasan: CONFIG_KASAN_INLINE enabled [ 49.447641] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 49.455047] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.461372] CPU: 1 PID: 5839 Comm: syz-executor072 Not tainted 4.19.0-rc6+ #251 [ 49.469041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.478413] RIP: 0010:rb_erase+0x306/0x3710 [ 49.482766] 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 [ 49.501664] RSP: 0018:ffff8801d7eb6918 EFLAGS: 00010202 [ 49.507137] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.514407] RDX: 1ffff1003afd6d2b RSI: ffffffff8afc28a0 RDI: 0000000000000008 [ 49.521676] RBP: ffff8801d7eb7320 R08: dffffc0000000000 R09: fffffbfff12d69f8 [ 49.528951] R10: fffffbfff12d69f8 R11: ffffffff896b4fc3 R12: ffff8801c4400330 [ 49.536215] R13: dffffc0000000000 R14: ffff8801d7eb72f8 R15: ffff8801d7eb7438 [ 49.543479] FS: 0000000002005880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 49.551699] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.557574] CR2: 0000000020000380 CR3: 00000001d75c7000 CR4: 00000000001406e0 [ 49.564934] Call Trace: [ 49.567525] ? rb_insert_color+0x1460/0x1460 [ 49.571937] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 49.576977] ? lock_downgrade+0x900/0x900 [ 49.581129] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.586922] ? mark_held_locks+0x130/0x130 [ 49.591236] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.596512] ? rcu_bh_qs+0xc0/0xc0 [ 49.600046] ? unwind_dump+0x190/0x190 [ 49.604015] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.609556] ? mark_held_locks+0x130/0x130 [ 49.613786] ? mark_page_accessed+0xcb0/0x2040 [ 49.618387] ? activate_page+0x1040/0x1040 [ 49.623008] ? activate_page+0x1040/0x1040 [ 49.627249] ? mark_held_locks+0x130/0x130 [ 49.631482] ? kasan_kmalloc+0xc7/0xe0 [ 49.635368] ? kmem_cache_alloc_trace+0x152/0x750 [ 49.640208] ? ima_add_digest_entry+0xcb/0x6a0 [ 49.644785] ? ima_add_template_entry+0x466/0x7f0 [ 49.649772] ? ima_store_template+0x224/0x310 [ 49.654292] ? pagecache_get_page+0x2d8/0xf00 [ 49.658790] ? find_get_pages_contig+0x15b0/0x15b0 [ 49.663746] ? is_bpf_text_address+0xac/0x170 [ 49.668707] ? lock_downgrade+0x900/0x900 [ 49.672854] ? mark_held_locks+0x130/0x130 [ 49.677086] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.682884] ? mark_held_locks+0x130/0x130 [ 49.687116] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 49.692477] ? lock_downgrade+0x900/0x900 [ 49.696755] ? kasan_check_read+0x11/0x20 [ 49.701022] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.705428] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.710011] ? mark_held_locks+0x130/0x130 [ 49.714420] ? _raw_spin_unlock+0x2c/0x50 [ 49.718573] ? ext4_discard_preallocations+0x18a/0x13c0 [ 49.723936] ? trace_hardirqs_on+0xbd/0x310 [ 49.728258] ? ext4_exit_mballoc+0xc0/0xc0 [ 49.732563] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.737735] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 49.742531] ? modules_open+0xa0/0xa0 [ 49.746327] ? __es_tree_search.isra.12+0x1ba/0x220 [ 49.751341] ? __es_remove_extent+0x9a3/0xba0 [ 49.755853] ? mark_held_locks+0x130/0x130 [ 49.760081] ? lock_downgrade+0x900/0x900 [ 49.764224] ? ext4_es_scan+0x960/0x960 [ 49.768361] ? lock_release+0x970/0x970 [ 49.772478] ? trace_hardirqs_on+0xbd/0x310 [ 49.776821] ? kasan_check_read+0x11/0x20 [ 49.780969] ? clear_inode+0x114/0x3a0 [ 49.784998] ? do_raw_write_trylock+0x1c0/0x1c0 [ 49.789668] ? kasan_check_write+0x14/0x20 [ 49.793904] ? lock_acquire+0x1ed/0x520 [ 49.797873] ? integrity_inode_free+0x77/0x320 [ 49.802456] ? ext4_es_remove_extent+0x151/0x500 [ 49.807205] ? lock_release+0x970/0x970 [ 49.811264] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 49.816374] ? depot_save_stack+0x292/0x470 [ 49.820698] ? kasan_check_write+0x14/0x20 [ 49.824928] ? do_raw_write_lock+0xbd/0x1b0 [ 49.829249] integrity_inode_free+0x12f/0x320 [ 49.833743] security_inode_free+0x19/0x90 [ 49.838107] __destroy_inode+0x328/0x820 [ 49.842168] ? generic_update_time+0x450/0x450 [ 49.846742] ? evict+0x5d8/0x980 [ 49.850105] ? lock_downgrade+0x900/0x900 [ 49.854248] ? __inode_wait_for_writeback+0x2cf/0x380 [ 49.859683] destroy_inode+0xda/0x200 [ 49.863610] ? __destroy_inode+0x820/0x820 [ 49.868005] ? kasan_check_write+0x14/0x20 [ 49.872252] ? do_raw_spin_lock+0xc1/0x200 [ 49.876481] evict+0x5e0/0x980 [ 49.879669] ? jbd2_journal_stop+0x430/0x15d0 [ 49.884237] ? destroy_inode+0x200/0x200 [ 49.888305] ? do_raw_spin_lock+0xc1/0x200 [ 49.892537] ? iput+0x671/0xa90 [ 49.895832] ? lock_downgrade+0x900/0x900 [ 49.900066] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 49.905607] ? kasan_check_read+0x11/0x20 [ 49.909755] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.914361] ? lock_downgrade+0x900/0x900 [ 49.918508] ? ext4_ioctl+0x231b/0x4210 [ 49.922480] iput+0x679/0xa90 [ 49.925580] ? inode_add_lru+0x2a0/0x2a0 [ 49.929930] ? up_write+0x7b/0x220 [ 49.933470] ? up_read+0x110/0x110 [ 49.937001] ? up_read+0x110/0x110 [ 49.940650] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.946185] ? check_preemption_disabled+0x48/0x200 [ 49.951204] ext4_ioctl+0x236f/0x4210 [ 49.955003] ? is_bpf_text_address+0xac/0x170 [ 49.959571] ? ext4_ioctl_group_add+0x560/0x560 [ 49.964352] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.970152] ? kasan_check_read+0x11/0x20 [ 49.974297] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.979571] ? rcu_bh_qs+0xc0/0xc0 [ 49.983259] ? unwind_dump+0x190/0x190 [ 49.987158] ? is_bpf_text_address+0xd3/0x170 [ 49.991651] ? kernel_text_address+0x79/0xf0 [ 49.996170] ? __kernel_text_address+0xd/0x40 [ 50.001178] ? unwind_get_return_address+0x61/0xa0 [ 50.006251] ? __save_stack_trace+0x8d/0xf0 [ 50.010582] ? save_stack+0xa9/0xd0 [ 50.014203] ? save_stack+0x43/0xd0 [ 50.017957] ? __kasan_slab_free+0x102/0x150 [ 50.022401] ? kasan_slab_free+0xe/0x10 [ 50.026377] ? kmem_cache_free+0x83/0x290 [ 50.030673] ? putname+0xf2/0x130 [ 50.034124] ? do_sys_open+0x54d/0x700 [ 50.038007] ? __x64_sys_openat+0x9d/0x100 [ 50.042389] ? do_syscall_64+0x1b9/0x820 [ 50.046448] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.051840] ? trace_hardirqs_off+0xb8/0x310 [ 50.056244] ? kasan_check_read+0x11/0x20 [ 50.060390] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.064795] ? trace_hardirqs_on+0x310/0x310 [ 50.069338] ? kasan_check_write+0x14/0x20 [ 50.073680] ? trace_hardirqs_off+0xb8/0x310 [ 50.078092] ? trace_hardirqs_on+0x310/0x310 [ 50.082498] ? ext4_ioctl_group_add+0x560/0x560 [ 50.087166] do_vfs_ioctl+0x1de/0x1720 [ 50.091181] ? trace_hardirqs_on+0xbd/0x310 [ 50.095508] ? ioctl_preallocate+0x300/0x300 [ 50.100047] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.105852] ? __fget_light+0x2e9/0x430 [ 50.109850] ? fget_raw+0x20/0x20 [ 50.113350] ? putname+0xf2/0x130 [ 50.116949] ? kmem_cache_free+0x21a/0x290 [ 50.121182] ? putname+0xf7/0x130 [ 50.124637] ? security_file_ioctl+0x94/0xc0 [ 50.129041] ksys_ioctl+0xa9/0xd0 [ 50.132493] __x64_sys_ioctl+0x73/0xb0 [ 50.136913] do_syscall_64+0x1b9/0x820 [ 50.140823] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.146185] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.151283] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.156240] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.161252] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.166369] ? prepare_exit_to_usermode+0x291/0x3b0 [ 50.171503] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.176351] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.181958] RIP: 0033:0x440009 [ 50.185265] 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 [ 50.204585] RSP: 002b:00007ffe6982ed08 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 50.212460] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 50.219868] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 50.227243] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 50.234712] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 50.242391] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 50.250009] Modules linked in: [ 50.253686] ---[ end trace 4151d2e0756f9e34 ]--- [ 50.258484] RIP: 0010:rb_erase+0x306/0x3710 [ 50.262829] 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 [ 50.282208] RSP: 0018:ffff8801d7eb6918 EFLAGS: 00010202 [ 50.287915] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.295396] RDX: 1ffff1003afd6d2b RSI: ffffffff8afc28a0 RDI: 0000000000000008 [ 50.302882] RBP: ffff8801d7eb7320 R08: dffffc0000000000 R09: fffffbfff12d69f8 [ 50.310199] R10: fffffbfff12d69f8 R11: ffffffff896b4fc3 R12: ffff8801c4400330 [ 50.317664] R13: dffffc0000000000 R14: ffff8801d7eb72f8 R15: ffff8801d7eb7438 [ 50.325249] FS: 0000000002005880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 50.334016] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.340532] CR2: 0000000020000380 CR3: 00000001d75c7000 CR4: 00000000001406e0 [ 50.347943] Kernel panic - not syncing: Fatal exception [ 50.354529] Kernel Offset: disabled [ 50.358299] Rebooting in 86400 seconds..