[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.071394] audit: type=1800 audit(1539240376.479:25): pid=5664 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 37.090421] audit: type=1800 audit(1539240376.479:26): pid=5664 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.090442] audit: type=1800 audit(1539240376.479:27): pid=5664 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 '10.128.0.79' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.357523] kasan: CONFIG_KASAN_INLINE enabled [ 48.362199] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 48.369548] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 48.375763] CPU: 0 PID: 5819 Comm: syz-executor590 Not tainted 4.19.0-rc6+ #136 [ 48.383205] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.392550] RIP: 0010:rb_erase+0x306/0x3710 [ 48.396854] 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 [ 48.415740] RSP: 0018:ffff8801d83ae918 EFLAGS: 00010202 [ 48.421084] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.428334] RDX: 1ffff1003b075d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 48.435585] RBP: ffff8801d83af320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 48.442837] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c40032b0 [ 48.450084] R13: dffffc0000000000 R14: ffff8801d83af2f8 R15: ffff8801d83af438 [ 48.457335] FS: 0000000000e67880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 48.465543] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.471404] CR2: 0000000020000080 CR3: 00000001c0953000 CR4: 00000000001406f0 [ 48.478667] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.485919] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.493177] Call Trace: [ 48.495752] ? rb_insert_color+0x1460/0x1460 [ 48.500156] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 48.505069] ? lock_downgrade+0x900/0x900 [ 48.509203] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.514985] ? mark_held_locks+0x130/0x130 [ 48.519203] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.524464] ? rcu_bh_qs+0xc0/0xc0 [ 48.527983] ? unwind_dump+0x190/0x190 [ 48.531858] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.537379] ? mark_held_locks+0x130/0x130 [ 48.541598] ? mark_page_accessed+0xcb0/0x2040 [ 48.546163] ? activate_page+0x1040/0x1040 [ 48.550382] ? activate_page+0x1040/0x1040 [ 48.554604] ? mark_held_locks+0x130/0x130 [ 48.558819] ? kasan_kmalloc+0xc7/0xe0 [ 48.562702] ? kmem_cache_alloc_trace+0x152/0x750 [ 48.567526] ? ima_add_digest_entry+0xcb/0x6a0 [ 48.572090] ? ima_add_template_entry+0x466/0x7f0 [ 48.576930] ? ima_store_template+0x224/0x310 [ 48.581415] ? pagecache_get_page+0x2d8/0xf00 [ 48.585900] ? find_get_pages_contig+0x15b0/0x15b0 [ 48.590831] ? is_bpf_text_address+0xac/0x170 [ 48.595305] ? lock_downgrade+0x900/0x900 [ 48.599433] ? mark_held_locks+0x130/0x130 [ 48.603651] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.609443] ? mark_held_locks+0x130/0x130 [ 48.613658] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 48.619013] ? lock_downgrade+0x900/0x900 [ 48.623138] ? kasan_check_read+0x11/0x20 [ 48.627287] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.631672] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.636236] ? mark_held_locks+0x130/0x130 [ 48.640450] ? _raw_spin_unlock+0x2c/0x50 [ 48.644579] ? ext4_discard_preallocations+0x18a/0x13c0 [ 48.649921] ? trace_hardirqs_on+0xbd/0x310 [ 48.654224] ? ext4_exit_mballoc+0xc0/0xc0 [ 48.658443] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.663439] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 48.668173] ? modules_open+0xa0/0xa0 [ 48.671974] ? __es_tree_search.isra.12+0x1ba/0x220 [ 48.677032] ? __es_remove_extent+0x9a3/0xba0 [ 48.681505] ? mark_held_locks+0x130/0x130 [ 48.685718] ? lock_downgrade+0x900/0x900 [ 48.689842] ? ext4_es_scan+0x960/0x960 [ 48.693809] ? lock_release+0x970/0x970 [ 48.697759] ? trace_hardirqs_on+0xbd/0x310 [ 48.702055] ? kasan_check_read+0x11/0x20 [ 48.706203] ? clear_inode+0x114/0x3a0 [ 48.710069] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.714718] ? kasan_check_write+0x14/0x20 [ 48.718932] ? lock_acquire+0x1ed/0x520 [ 48.722898] ? integrity_inode_free+0x77/0x320 [ 48.727457] ? ext4_es_remove_extent+0x151/0x500 [ 48.732215] ? lock_release+0x970/0x970 [ 48.736187] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.741274] ? depot_save_stack+0x292/0x470 [ 48.745572] ? kasan_check_write+0x14/0x20 [ 48.749784] ? do_raw_write_lock+0xbd/0x1b0 [ 48.754083] integrity_inode_free+0x12f/0x320 [ 48.758562] security_inode_free+0x19/0x90 [ 48.762773] __destroy_inode+0x328/0x820 [ 48.766811] ? generic_update_time+0x450/0x450 [ 48.771370] ? evict+0x5d8/0x980 [ 48.774722] ? lock_downgrade+0x900/0x900 [ 48.778845] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.784016] destroy_inode+0xda/0x200 [ 48.787797] ? __destroy_inode+0x820/0x820 [ 48.792007] ? kasan_check_write+0x14/0x20 [ 48.796219] ? do_raw_spin_lock+0xc1/0x200 [ 48.800430] evict+0x5e0/0x980 [ 48.803600] ? jbd2_journal_stop+0x430/0x15d0 [ 48.808083] ? destroy_inode+0x200/0x200 [ 48.812121] ? do_raw_spin_lock+0xc1/0x200 [ 48.816329] ? iput+0x671/0xa90 [ 48.819586] ? lock_downgrade+0x900/0x900 [ 48.823734] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.829253] ? kasan_check_read+0x11/0x20 [ 48.833385] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.837947] ? lock_downgrade+0x900/0x900 [ 48.842239] ? ext4_ioctl+0x231b/0x4210 [ 48.846213] iput+0x679/0xa90 [ 48.849303] ? inode_add_lru+0x2a0/0x2a0 [ 48.853342] ? up_write+0x7b/0x220 [ 48.856858] ? up_read+0x110/0x110 [ 48.860374] ? up_read+0x110/0x110 [ 48.863895] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.869412] ? check_preemption_disabled+0x48/0x200 [ 48.874408] ext4_ioctl+0x236f/0x4210 [ 48.878213] ? is_bpf_text_address+0xac/0x170 [ 48.882781] ? ext4_ioctl_group_add+0x560/0x560 [ 48.887430] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.893206] ? kasan_check_read+0x11/0x20 [ 48.897333] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.902612] ? rcu_bh_qs+0xc0/0xc0 [ 48.906132] ? unwind_dump+0x190/0x190 [ 48.910006] ? is_bpf_text_address+0xd3/0x170 [ 48.914484] ? kernel_text_address+0x79/0xf0 [ 48.918872] ? __kernel_text_address+0xd/0x40 [ 48.923344] ? unwind_get_return_address+0x61/0xa0 [ 48.928255] ? __save_stack_trace+0x8d/0xf0 [ 48.932561] ? save_stack+0xa9/0xd0 [ 48.936170] ? save_stack+0x43/0xd0 [ 48.939776] ? __kasan_slab_free+0x102/0x150 [ 48.944194] ? kasan_slab_free+0xe/0x10 [ 48.948155] ? kmem_cache_free+0x83/0x290 [ 48.952281] ? putname+0xf2/0x130 [ 48.955714] ? do_sys_open+0x54d/0x700 [ 48.959579] ? __x64_sys_openat+0x9d/0x100 [ 48.963792] ? do_syscall_64+0x1b9/0x820 [ 48.967863] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.973219] ? trace_hardirqs_off+0xb8/0x310 [ 48.977602] ? kasan_check_read+0x11/0x20 [ 48.981743] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.986128] ? trace_hardirqs_on+0x310/0x310 [ 48.990516] ? kasan_check_write+0x14/0x20 [ 48.994758] ? trace_hardirqs_off+0xb8/0x310 [ 48.999151] ? trace_hardirqs_on+0x310/0x310 [ 49.003541] ? ext4_ioctl_group_add+0x560/0x560 [ 49.008190] do_vfs_ioctl+0x1de/0x1720 [ 49.012055] ? trace_hardirqs_on+0xbd/0x310 [ 49.016355] ? ioctl_preallocate+0x300/0x300 [ 49.020756] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.026277] ? __fget_light+0x2e9/0x430 [ 49.030232] ? fget_raw+0x20/0x20 [ 49.033661] ? putname+0xf2/0x130 [ 49.037095] ? kmem_cache_free+0x21a/0x290 [ 49.041305] ? putname+0xf7/0x130 [ 49.044853] ? security_file_ioctl+0x94/0xc0 [ 49.049243] ksys_ioctl+0xa9/0xd0 [ 49.052681] __x64_sys_ioctl+0x73/0xb0 [ 49.056562] do_syscall_64+0x1b9/0x820 [ 49.060428] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 49.065771] ? syscall_return_slowpath+0x5e0/0x5e0 [ 49.070678] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.075501] ? trace_hardirqs_on_caller+0x310/0x310 [ 49.080498] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 49.085491] ? prepare_exit_to_usermode+0x291/0x3b0 [ 49.090489] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.095312] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.100481] RIP: 0033:0x440009 [ 49.103659] 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 [ 49.122627] RSP: 002b:00007fffa4916038 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 49.130341] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 49.137591] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 49.144837] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 49.152085] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 49.159336] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 49.166591] Modules linked in: [ 49.169904] ---[ end trace 43cc9e4edd4f2bca ]--- [ 49.174786] RIP: 0010:rb_erase+0x306/0x3710 [ 49.179092] 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 [ 49.198027] RSP: 0018:ffff8801d83ae918 EFLAGS: 00010202 [ 49.203390] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.210641] RDX: 1ffff1003b075d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 49.217931] RBP: ffff8801d83af320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 49.225217] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c40032b0 [ 49.232492] R13: dffffc0000000000 R14: ffff8801d83af2f8 R15: ffff8801d83af438 [ 49.239748] FS: 0000000000e67880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 49.247978] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.253857] CR2: 0000000020000080 CR3: 00000001c0953000 CR4: 00000000001406f0 [ 49.261129] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.268440] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.275725] Kernel panic - not syncing: Fatal exception [ 49.281917] Kernel Offset: disabled [ 49.285535] Rebooting in 86400 seconds..