[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 31.222966] audit: type=1800 audit(1538819409.606:25): pid=5642 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 31.253712] audit: type=1800 audit(1538819409.606:26): pid=5642 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 31.274255] audit: type=1800 audit(1538819409.606:27): pid=5642 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 '10.128.10.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.840733] kasan: CONFIG_KASAN_INLINE enabled [ 53.845472] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 53.852861] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.859092] CPU: 0 PID: 5796 Comm: syz-executor715 Not tainted 4.19.0-rc6+ #270 [ 53.866660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.876284] RIP: 0010:rb_erase+0x306/0x3710 [ 53.880590] 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 [ 53.899478] RSP: 0018:ffff8801bbede918 EFLAGS: 00010202 [ 53.904882] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 53.912137] RDX: 1ffff100377dbd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 53.919397] RBP: ffff8801bbedf320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 53.926812] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8f601f0 [ 53.934064] R13: dffffc0000000000 R14: ffff8801bbedf2f8 R15: ffff8801bbedf438 [ 53.941320] FS: 00000000025f5880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 53.949529] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.955388] CR2: 0000000020000040 CR3: 00000001c5789000 CR4: 00000000001406f0 [ 53.962645] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.969901] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.977150] Call Trace: [ 53.979844] ? rb_insert_color+0x1460/0x1460 [ 53.984240] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 53.988982] ? is_bpf_text_address+0xac/0x170 [ 53.993460] ? lock_downgrade+0x900/0x900 [ 53.997600] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 54.003487] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 54.009123] ? mark_page_accessed+0xcb0/0x2040 [ 54.013695] ? activate_page+0x1040/0x1040 [ 54.017927] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 54.023494] ? mark_held_locks+0x130/0x130 [ 54.027710] ? mark_page_accessed+0xcb0/0x2040 [ 54.032271] ? activate_page+0x1040/0x1040 [ 54.036488] ? activate_page+0x1040/0x1040 [ 54.040708] ? mark_held_locks+0x130/0x130 [ 54.045028] ? kasan_kmalloc+0xc7/0xe0 [ 54.048938] ? kmem_cache_alloc_trace+0x152/0x750 [ 54.053768] ? ima_add_digest_entry+0xcb/0x6a0 [ 54.058331] ? ima_add_template_entry+0x466/0x7f0 [ 54.063154] ? ima_store_template+0x224/0x310 [ 54.067758] ? ima_store_measurement+0x321/0x630 [ 54.072495] ? process_measurement+0x15c4/0x1bf0 [ 54.077230] ? ima_file_check+0xe5/0x130 [ 54.081274] ? path_openat+0x134d/0x5160 [ 54.085313] ? do_filp_open+0x255/0x380 [ 54.089272] ? do_sys_open+0x568/0x700 [ 54.093149] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 54.098153] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 54.102892] ? is_bpf_text_address+0xac/0x170 [ 54.107379] ? lock_downgrade+0x900/0x900 [ 54.111533] ? mark_held_locks+0x130/0x130 [ 54.115751] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 54.121535] ? mark_held_locks+0x130/0x130 [ 54.125756] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 54.131164] ? lock_downgrade+0x900/0x900 [ 54.135299] ? kasan_check_read+0x11/0x20 [ 54.139429] ? do_raw_spin_unlock+0xa7/0x2f0 [ 54.143823] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 54.148450] ? mark_held_locks+0x130/0x130 [ 54.152683] ? _raw_spin_unlock+0x2c/0x50 [ 54.156923] ? ext4_discard_preallocations+0x18a/0x13c0 [ 54.162377] ? trace_hardirqs_on+0xbd/0x310 [ 54.166682] ? ext4_exit_mballoc+0xc0/0xc0 [ 54.170899] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 54.175904] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 54.180653] ? modules_open+0xa0/0xa0 [ 54.184437] ? __es_tree_search.isra.12+0x1ba/0x220 [ 54.189436] ? __es_remove_extent+0x9a3/0xba0 [ 54.193911] ? mark_held_locks+0x130/0x130 [ 54.198192] ? lock_downgrade+0x900/0x900 [ 54.202330] ? ext4_es_scan+0x960/0x960 [ 54.206286] ? lock_release+0x970/0x970 [ 54.210305] ? trace_hardirqs_on+0xbd/0x310 [ 54.214610] ? kasan_check_read+0x11/0x20 [ 54.218747] ? clear_inode+0x114/0x3a0 [ 54.222675] ? do_raw_write_trylock+0x1c0/0x1c0 [ 54.227331] ? kasan_check_write+0x14/0x20 [ 54.231546] ? lock_acquire+0x1ed/0x520 [ 54.235576] ? integrity_inode_free+0x77/0x320 [ 54.240277] ? ext4_es_remove_extent+0x151/0x500 [ 54.245015] ? lock_release+0x970/0x970 [ 54.248973] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 54.254056] ? depot_save_stack+0x292/0x470 [ 54.258356] ? kasan_check_write+0x14/0x20 [ 54.262571] ? do_raw_write_lock+0xbd/0x1b0 [ 54.266880] integrity_inode_free+0x12f/0x320 [ 54.271359] security_inode_free+0x19/0x90 [ 54.275654] __destroy_inode+0x328/0x820 [ 54.279704] ? generic_update_time+0x450/0x450 [ 54.284396] ? evict+0x5d8/0x980 [ 54.287872] ? lock_downgrade+0x900/0x900 [ 54.292002] ? __inode_wait_for_writeback+0x2cf/0x380 [ 54.297189] destroy_inode+0xda/0x200 [ 54.300972] ? __destroy_inode+0x820/0x820 [ 54.305190] ? kasan_check_write+0x14/0x20 [ 54.309508] ? do_raw_spin_lock+0xc1/0x200 [ 54.313960] evict+0x5e0/0x980 [ 54.317135] ? jbd2_journal_stop+0x430/0x15d0 [ 54.321615] ? destroy_inode+0x200/0x200 [ 54.325768] ? do_raw_spin_lock+0xc1/0x200 [ 54.329984] ? iput+0x671/0xa90 [ 54.333279] ? lock_downgrade+0x900/0x900 [ 54.337420] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.342938] ? kasan_check_read+0x11/0x20 [ 54.347129] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 54.351696] ? lock_downgrade+0x900/0x900 [ 54.355823] ? ext4_ioctl+0x231b/0x4210 [ 54.359776] iput+0x679/0xa90 [ 54.362863] ? inode_add_lru+0x2a0/0x2a0 [ 54.366903] ? up_write+0x7b/0x220 [ 54.370421] ? up_read+0x110/0x110 [ 54.373941] ? up_read+0x110/0x110 [ 54.377459] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.383014] ? check_preemption_disabled+0x48/0x200 [ 54.388012] ext4_ioctl+0x236f/0x4210 [ 54.391794] ? is_bpf_text_address+0xac/0x170 [ 54.396269] ? ext4_ioctl_group_add+0x560/0x560 [ 54.400926] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 54.406716] ? kasan_check_read+0x11/0x20 [ 54.410938] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 54.416196] ? rcu_bh_qs+0xc0/0xc0 [ 54.419716] ? unwind_dump+0x190/0x190 [ 54.423588] ? is_bpf_text_address+0xd3/0x170 [ 54.428064] ? kernel_text_address+0x79/0xf0 [ 54.432453] ? __kernel_text_address+0xd/0x40 [ 54.436933] ? unwind_get_return_address+0x61/0xa0 [ 54.441845] ? __save_stack_trace+0x8d/0xf0 [ 54.446150] ? save_stack+0xa9/0xd0 [ 54.449753] ? save_stack+0x43/0xd0 [ 54.453358] ? __kasan_slab_free+0x102/0x150 [ 54.457745] ? kasan_slab_free+0xe/0x10 [ 54.461709] ? kmem_cache_free+0x83/0x290 [ 54.465845] ? putname+0xf2/0x130 [ 54.469281] ? do_sys_open+0x54d/0x700 [ 54.473149] ? __x64_sys_openat+0x9d/0x100 [ 54.477365] ? do_syscall_64+0x1b9/0x820 [ 54.481407] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.486762] ? trace_hardirqs_off+0xb8/0x310 [ 54.491154] ? kasan_check_read+0x11/0x20 [ 54.495284] ? do_raw_spin_unlock+0xa7/0x2f0 [ 54.499684] ? trace_hardirqs_on+0x310/0x310 [ 54.504114] ? kasan_check_write+0x14/0x20 [ 54.508338] ? trace_hardirqs_off+0xb8/0x310 [ 54.512729] ? trace_hardirqs_on+0x310/0x310 [ 54.517122] ? ext4_ioctl_group_add+0x560/0x560 [ 54.521795] do_vfs_ioctl+0x1de/0x1720 [ 54.525682] ? trace_hardirqs_on+0xbd/0x310 [ 54.530063] ? ioctl_preallocate+0x300/0x300 [ 54.534480] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.540009] ? __fget_light+0x2e9/0x430 [ 54.543973] ? fget_raw+0x20/0x20 [ 54.547426] ? putname+0xf2/0x130 [ 54.550869] ? kmem_cache_free+0x21a/0x290 [ 54.555090] ? putname+0xf7/0x130 [ 54.558528] ? security_file_ioctl+0x94/0xc0 [ 54.562920] ksys_ioctl+0xa9/0xd0 [ 54.566354] __x64_sys_ioctl+0x73/0xb0 [ 54.570228] do_syscall_64+0x1b9/0x820 [ 54.574100] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 54.579452] ? syscall_return_slowpath+0x5e0/0x5e0 [ 54.584379] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.589209] ? trace_hardirqs_on_caller+0x310/0x310 [ 54.594267] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 54.599270] ? prepare_exit_to_usermode+0x291/0x3b0 [ 54.604270] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.609095] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.614263] RIP: 0033:0x440029 [ 54.617445] 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 [ 54.636336] RSP: 002b:00007ffedab7af28 EFLAGS: 00000207 ORIG_RAX: 0000000000000010 [ 54.644028] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 54.651277] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 54.658528] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 54.665781] R10: 0000000000000000 R11: 0000000000000207 R12: 00000000004018b0 [ 54.673039] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 54.680305] Modules linked in: [ 54.683633] ---[ end trace 68fe27daf6bca301 ]--- [ 54.688416] RIP: 0010:rb_erase+0x306/0x3710 [ 54.692721] 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 [ 54.711801] RSP: 0018:ffff8801bbede918 EFLAGS: 00010202 [ 54.717150] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 54.724429] RDX: 1ffff100377dbd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 54.731695] RBP: ffff8801bbedf320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 54.738969] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8f601f0 [ 54.746227] R13: dffffc0000000000 R14: ffff8801bbedf2f8 R15: ffff8801bbedf438 [ 54.753520] FS: 00000000025f5880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 54.761752] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 54.767659] CR2: 0000000020000040 CR3: 00000001c5789000 CR4: 00000000001406f0 [ 54.774958] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.782253] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.789524] Kernel panic - not syncing: Fatal exception [ 54.795871] Kernel Offset: disabled [ 54.799494] Rebooting in 86400 seconds..