[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.467142] audit: type=1800 audit(1539264587.314:25): pid=5666 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.493182] audit: type=1800 audit(1539264587.314:26): pid=5666 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.519221] audit: type=1800 audit(1539264587.324:27): pid=5666 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 '10.128.10.26' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.396674] kasan: CONFIG_KASAN_INLINE enabled [ 45.401298] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 45.408735] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.414986] CPU: 1 PID: 5818 Comm: syz-executor146 Not tainted 4.19.0-rc6+ #137 [ 45.422414] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.431791] RIP: 0010:rb_erase+0x306/0x3710 [ 45.436101] 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 [ 45.455041] RSP: 0018:ffff8801be7ae918 EFLAGS: 00010202 [ 45.460396] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 45.467659] RDX: 1ffff10037cf5d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 45.474915] RBP: ffff8801be7af320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 45.482169] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8e431f0 [ 45.489437] R13: dffffc0000000000 R14: ffff8801be7af2f8 R15: ffff8801be7af438 [ 45.496692] FS: 0000000001b5f880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 45.504901] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.510762] CR2: 0000000020000000 CR3: 00000001d70b7000 CR4: 00000000001406e0 [ 45.518016] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.525265] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.532529] Call Trace: [ 45.535107] ? rb_insert_color+0x1460/0x1460 [ 45.539501] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 45.544413] ? lock_downgrade+0x900/0x900 [ 45.548551] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.554333] ? mark_held_locks+0x130/0x130 [ 45.558555] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 45.563812] ? rcu_bh_qs+0xc0/0xc0 [ 45.567332] ? unwind_dump+0x190/0x190 [ 45.571206] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.576725] ? mark_held_locks+0x130/0x130 [ 45.580957] ? mark_page_accessed+0xcb0/0x2040 [ 45.585521] ? activate_page+0x1040/0x1040 [ 45.589735] ? activate_page+0x1040/0x1040 [ 45.593958] ? mark_held_locks+0x130/0x130 [ 45.598189] ? kasan_kmalloc+0xc7/0xe0 [ 45.602060] ? kmem_cache_alloc_trace+0x152/0x750 [ 45.606902] ? ima_add_digest_entry+0xcb/0x6a0 [ 45.611465] ? ima_add_template_entry+0x466/0x7f0 [ 45.616296] ? ima_store_template+0x224/0x310 [ 45.620776] ? pagecache_get_page+0x2d8/0xf00 [ 45.625261] ? find_get_pages_contig+0x15b0/0x15b0 [ 45.630177] ? is_bpf_text_address+0xac/0x170 [ 45.634667] ? lock_downgrade+0x900/0x900 [ 45.638797] ? mark_held_locks+0x130/0x130 [ 45.643040] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.648821] ? mark_held_locks+0x130/0x130 [ 45.653042] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 45.658388] ? lock_downgrade+0x900/0x900 [ 45.662519] ? kasan_check_read+0x11/0x20 [ 45.666664] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.671054] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 45.675634] ? mark_held_locks+0x130/0x130 [ 45.680058] ? _raw_spin_unlock+0x2c/0x50 [ 45.684193] ? ext4_discard_preallocations+0x18a/0x13c0 [ 45.689541] ? trace_hardirqs_on+0xbd/0x310 [ 45.693862] ? ext4_exit_mballoc+0xc0/0xc0 [ 45.698082] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.703085] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 45.707837] ? modules_open+0xa0/0xa0 [ 45.711621] ? __es_tree_search.isra.12+0x1ba/0x220 [ 45.716649] ? __es_remove_extent+0x9a3/0xba0 [ 45.721124] ? mark_held_locks+0x130/0x130 [ 45.725339] ? lock_downgrade+0x900/0x900 [ 45.729474] ? ext4_es_scan+0x960/0x960 [ 45.733450] ? lock_release+0x970/0x970 [ 45.737432] ? trace_hardirqs_on+0xbd/0x310 [ 45.741736] ? kasan_check_read+0x11/0x20 [ 45.745870] ? clear_inode+0x114/0x3a0 [ 45.749742] ? do_raw_write_trylock+0x1c0/0x1c0 [ 45.754425] ? kasan_check_write+0x14/0x20 [ 45.758642] ? lock_acquire+0x1ed/0x520 [ 45.762599] ? integrity_inode_free+0x77/0x320 [ 45.767197] ? ext4_es_remove_extent+0x151/0x500 [ 45.771959] ? lock_release+0x970/0x970 [ 45.775924] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 45.781008] ? depot_save_stack+0x292/0x470 [ 45.785314] ? kasan_check_write+0x14/0x20 [ 45.789549] ? do_raw_write_lock+0xbd/0x1b0 [ 45.793863] integrity_inode_free+0x12f/0x320 [ 45.798368] security_inode_free+0x19/0x90 [ 45.802581] __destroy_inode+0x328/0x820 [ 45.806622] ? generic_update_time+0x450/0x450 [ 45.811184] ? evict+0x5d8/0x980 [ 45.814534] ? lock_downgrade+0x900/0x900 [ 45.818664] ? __inode_wait_for_writeback+0x2cf/0x380 [ 45.823835] destroy_inode+0xda/0x200 [ 45.827620] ? __destroy_inode+0x820/0x820 [ 45.831850] ? kasan_check_write+0x14/0x20 [ 45.836069] ? do_raw_spin_lock+0xc1/0x200 [ 45.840285] evict+0x5e0/0x980 [ 45.843463] ? jbd2_journal_stop+0x430/0x15d0 [ 45.847947] ? destroy_inode+0x200/0x200 [ 45.851993] ? do_raw_spin_lock+0xc1/0x200 [ 45.856206] ? iput+0x671/0xa90 [ 45.859485] ? lock_downgrade+0x900/0x900 [ 45.863634] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 45.869154] ? kasan_check_read+0x11/0x20 [ 45.873285] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 45.877850] ? lock_downgrade+0x900/0x900 [ 45.881988] ? ext4_ioctl+0x231b/0x4210 [ 45.885949] iput+0x679/0xa90 [ 45.889042] ? inode_add_lru+0x2a0/0x2a0 [ 45.893088] ? up_write+0x7b/0x220 [ 45.896617] ? up_read+0x110/0x110 [ 45.900135] ? up_read+0x110/0x110 [ 45.903660] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.909198] ? check_preemption_disabled+0x48/0x200 [ 45.914198] ext4_ioctl+0x236f/0x4210 [ 45.917987] ? is_bpf_text_address+0xac/0x170 [ 45.922489] ? ext4_ioctl_group_add+0x560/0x560 [ 45.927160] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.932940] ? kasan_check_read+0x11/0x20 [ 45.937069] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 45.942328] ? rcu_bh_qs+0xc0/0xc0 [ 45.945847] ? unwind_dump+0x190/0x190 [ 45.949720] ? is_bpf_text_address+0xd3/0x170 [ 45.954206] ? kernel_text_address+0x79/0xf0 [ 45.958611] ? __kernel_text_address+0xd/0x40 [ 45.963094] ? unwind_get_return_address+0x61/0xa0 [ 45.968013] ? __save_stack_trace+0x8d/0xf0 [ 45.972324] ? save_stack+0xa9/0xd0 [ 45.975932] ? save_stack+0x43/0xd0 [ 45.979537] ? __kasan_slab_free+0x102/0x150 [ 45.983927] ? kasan_slab_free+0xe/0x10 [ 45.987887] ? kmem_cache_free+0x83/0x290 [ 45.992016] ? putname+0xf2/0x130 [ 45.995454] ? do_sys_open+0x54d/0x700 [ 45.999340] ? __x64_sys_openat+0x9d/0x100 [ 46.003559] ? do_syscall_64+0x1b9/0x820 [ 46.007605] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.012972] ? trace_hardirqs_off+0xb8/0x310 [ 46.017361] ? kasan_check_read+0x11/0x20 [ 46.021509] ? do_raw_spin_unlock+0xa7/0x2f0 [ 46.025903] ? trace_hardirqs_on+0x310/0x310 [ 46.030310] ? kasan_check_write+0x14/0x20 [ 46.034529] ? trace_hardirqs_off+0xb8/0x310 [ 46.038934] ? trace_hardirqs_on+0x310/0x310 [ 46.043341] ? ext4_ioctl_group_add+0x560/0x560 [ 46.047993] do_vfs_ioctl+0x1de/0x1720 [ 46.051889] ? trace_hardirqs_on+0xbd/0x310 [ 46.056213] ? ioctl_preallocate+0x300/0x300 [ 46.060635] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.066168] ? __fget_light+0x2e9/0x430 [ 46.070127] ? fget_raw+0x20/0x20 [ 46.073561] ? putname+0xf2/0x130 [ 46.077008] ? kmem_cache_free+0x21a/0x290 [ 46.081222] ? putname+0xf7/0x130 [ 46.084665] ? security_file_ioctl+0x94/0xc0 [ 46.089060] ksys_ioctl+0xa9/0xd0 [ 46.092501] __x64_sys_ioctl+0x73/0xb0 [ 46.096374] do_syscall_64+0x1b9/0x820 [ 46.100246] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 46.105591] ? syscall_return_slowpath+0x5e0/0x5e0 [ 46.110528] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.115364] ? trace_hardirqs_on_caller+0x310/0x310 [ 46.120401] ? prepare_exit_to_usermode+0x291/0x3b0 [ 46.125404] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.130232] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.135410] RIP: 0033:0x440029 [ 46.138588] 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 [ 46.157487] RSP: 002b:00007ffc0db66248 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 46.165184] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 46.172438] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 46.179688] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 46.186938] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018b0 [ 46.194189] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 46.201443] Modules linked in: [ 46.204802] ---[ end trace 29a903ae6895c1d5 ]--- [ 46.209581] RIP: 0010:rb_erase+0x306/0x3710 [ 46.213936] 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 [ 46.232871] RSP: 0018:ffff8801be7ae918 EFLAGS: 00010202 [ 46.238232] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 46.245524] RDX: 1ffff10037cf5d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 46.252811] RBP: ffff8801be7af320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 46.260063] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8e431f0 [ 46.267342] R13: dffffc0000000000 R14: ffff8801be7af2f8 R15: ffff8801be7af438 [ 46.274628] FS: 0000000001b5f880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 46.282870] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.288764] CR2: 0000000020000000 CR3: 00000001d70b7000 CR4: 00000000001406e0 [ 46.296066] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.303348] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.310598] Kernel panic - not syncing: Fatal exception [ 46.316866] Kernel Offset: disabled [ 46.320496] Rebooting in 86400 seconds..