[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 81.537581][ T27] audit: type=1800 audit(1584273711.968:25): pid=9436 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 81.572768][ T27] audit: type=1800 audit(1584273711.968:26): pid=9436 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 81.610720][ T27] audit: type=1800 audit(1584273711.968:27): pid=9436 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 '10.128.0.116' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 530.511593][T10043] general protection fault, probably for non-canonical address 0xdffffc0000000030: 0000 [#1] PREEMPT SMP KASAN [ 530.524912][T10043] KASAN: null-ptr-deref in range [0x0000000000000180-0x0000000000000187] [ 530.533329][T10043] CPU: 0 PID: 10043 Comm: blkid Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 530.542432][T10043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 530.552648][T10043] RIP: 0010:__queue_work+0xe8/0x1280 executing program executing program [ 530.557951][T10043] Code: c6 00 bf 97 89 4c 89 e7 e8 15 14 48 02 49 8d 86 80 01 00 00 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 94 0e 00 00 41 8b 9e 80 01 00 [ 530.577956][T10043] RSP: 0018:ffffc90002987078 EFLAGS: 00010006 [ 530.584113][T10043] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 530.592089][T10043] RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001 [ 530.600182][T10043] RBP: 0000000000000040 R08: ffff8880a07a2540 R09: fffffbfff1914086 executing program executing program executing program [ 530.608506][T10043] R10: fffffbfff1914085 R11: ffffffff8c8a042b R12: ffff88809fc4fe18 [ 530.616919][T10043] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040 [ 530.624904][T10043] FS: 00007f4fe25a9740(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 530.633835][T10043] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 530.640422][T10043] CR2: 0000000002477058 CR3: 000000009ff78000 CR4: 00000000001406f0 [ 530.648403][T10043] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 executing program executing program [ 530.656376][T10043] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 530.664346][T10043] Call Trace: [ 530.667840][T10043] ? free_object+0x70/0x70 [ 530.672505][T10043] ? kmem_cache_alloc_trace+0x390/0x7d0 [ 530.678156][T10043] queue_work_on+0x18b/0x200 [ 530.682956][T10043] loop_queue_rq+0x5ac/0x1050 [ 530.687776][T10043] ? find_held_lock+0x2d/0x110 [ 530.692623][T10043] blk_mq_dispatch_rq_list+0x997/0x17f0 [ 530.698175][T10043] ? lock_downgrade+0x701/0x7f0 [ 530.703032][T10043] ? lock_downgrade+0x7f0/0x7f0 [ 530.708150][T10043] ? elv_rb_del+0x50/0x90 [ 530.712497][T10043] ? elv_rqhash_del+0x114/0x160 [ 530.717355][T10043] ? blk_mq_get_driver_tag+0x540/0x540 [ 530.722945][T10043] ? _raw_spin_unlock+0x24/0x40 [ 530.727860][T10043] ? dd_dispatch_request+0x240/0x8b0 [ 530.733194][T10043] blk_mq_do_dispatch_sched+0x188/0x3f0 [ 530.738784][T10043] ? blk_mq_sched_free_hctx_data+0x1e0/0x1e0 [ 530.744751][T10043] ? __lock_acquire+0x827/0x5270 [ 530.749788][T10043] blk_mq_sched_dispatch_requests+0x3cd/0x650 [ 530.755853][T10043] ? lock_acquire+0x197/0x420 [ 530.760520][T10043] ? blk_mq_sched_restart+0x90/0x90 [ 530.765770][T10043] ? rcu_dynticks_curr_cpu_in_eqs+0x4f/0xb0 [ 530.771654][T10043] __blk_mq_run_hw_queue+0x1b8/0x2c0 [ 530.776941][T10043] ? blk_mq_hctx_mark_pending+0x240/0x240 [ 530.782648][T10043] ? lock_acquire+0x197/0x420 [ 530.787365][T10043] ? hctx_lock+0x7f/0x1d0 [ 530.791690][T10043] __blk_mq_delay_run_hw_queue+0x522/0x5e0 [ 530.797511][T10043] blk_mq_run_hw_queue+0x16c/0x2f0 [ 530.802628][T10043] ? blk_mq_delay_run_hw_queue+0x30/0x30 [ 530.808270][T10043] ? dd_dispatch_request+0x8b0/0x8b0 [ 530.813555][T10043] blk_mq_sched_insert_requests+0x2d4/0x5f0 [ 530.819440][T10043] blk_mq_flush_plug_list+0x452/0x880 [ 530.824958][T10043] ? mpage_readpages+0x4c4/0x670 [ 530.829973][T10043] ? blk_mq_insert_requests+0x640/0x640 [ 530.835528][T10043] ? do_mpage_readpage+0x1fd0/0x1fd0 [ 530.840934][T10043] blk_flush_plug_list+0x2ff/0x460 [ 530.846056][T10043] ? blk_insert_cloned_request+0x500/0x500 [ 530.851910][T10043] ? put_pages_list+0x16/0x400 [ 530.856668][T10043] blk_finish_plug+0x50/0x97 [ 530.861341][T10043] ? blkdev_write_begin+0x40/0x40 [ 530.866357][T10043] read_pages+0x125/0x610 [ 530.870680][T10043] ? read_cache_pages+0x750/0x750 [ 530.875687][T10043] ? 0xffffffff81000000 [ 530.879918][T10043] ? __page_cache_alloc+0x110/0x480 [ 530.885129][T10043] __do_page_cache_readahead+0x47c/0x570 [ 530.890769][T10043] ? read_pages+0x610/0x610 [ 530.895261][T10043] ? lock_downgrade+0x7f0/0x7f0 [ 530.900090][T10043] force_page_cache_readahead+0x1dc/0x320 [ 530.905815][T10043] page_cache_sync_readahead+0x4b8/0x520 [ 530.911434][T10043] generic_file_read_iter+0x1650/0x2a40 [ 530.916962][T10043] ? lock_downgrade+0x7f0/0x7f0 [ 530.921798][T10043] ? filemap_write_and_wait_range+0x1e0/0x1e0 [ 530.927923][T10043] ? aa_file_perm+0x5d2/0x14d0 [ 530.932716][T10043] ? mem_cgroup_throttle_swaprate+0x190/0x64b [ 530.938769][T10043] ? aa_path_link+0x300/0x300 [ 530.943510][T10043] ? __handle_mm_fault+0x28a1/0x3af0 [ 530.948812][T10043] ? __this_cpu_preempt_check+0x28/0x190 [ 530.954522][T10043] blkdev_read_iter+0x11b/0x180 [ 530.959492][T10043] new_sync_read+0x4a2/0x790 [ 530.964087][T10043] ? vfs_dedupe_file_range+0x750/0x750 [ 530.969595][T10043] ? security_file_permission+0x8a/0x370 [ 530.975227][T10043] __vfs_read+0xc9/0x100 [ 530.979456][T10043] vfs_read+0x1ea/0x430 [ 530.983609][T10043] ksys_read+0x127/0x250 [ 530.987834][T10043] ? kernel_write+0x120/0x120 [ 530.992544][T10043] ? trace_hardirqs_off_caller+0x55/0x230 [ 530.998272][T10043] do_syscall_64+0xf6/0x790 [ 531.002769][T10043] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 531.008833][T10043] RIP: 0033:0x7f4fe1eb1310 [ 531.013305][T10043] Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 [ 531.034722][T10043] RSP: 002b:00007ffd661e4fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 531.043216][T10043] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4fe1eb1310 [ 531.051170][T10043] RDX: 0000000000000400 RSI: 0000000002476c58 RDI: 0000000000000003 [ 531.059384][T10043] RBP: 0000000002476c30 R08: 0000000000000028 R09: 0000000001680000 [ 531.067337][T10043] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002476030 [ 531.075303][T10043] R13: 0000000000000400 R14: 0000000002476080 R15: 0000000002476c48 [ 531.083266][T10043] Modules linked in: [ 531.087172][T10043] ---[ end trace 5be08dc2c8bb60b2 ]--- [ 531.092624][T10043] RIP: 0010:__queue_work+0xe8/0x1280 [ 531.097903][T10043] Code: c6 00 bf 97 89 4c 89 e7 e8 15 14 48 02 49 8d 86 80 01 00 00 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 94 0e 00 00 41 8b 9e 80 01 00 [ 531.117537][T10043] RSP: 0018:ffffc90002987078 EFLAGS: 00010006 [ 531.123747][T10043] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 531.131704][T10043] RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001 [ 531.139657][T10043] RBP: 0000000000000040 R08: ffff8880a07a2540 R09: fffffbfff1914086 [ 531.147613][T10043] R10: fffffbfff1914085 R11: ffffffff8c8a042b R12: ffff88809fc4fe18 [ 531.155565][T10043] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040 [ 531.163602][T10043] FS: 00007f4fe25a9740(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 531.172709][T10043] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 531.179286][T10043] CR2: 0000000002477058 CR3: 000000009ff78000 CR4: 00000000001406f0 [ 531.187328][T10043] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 531.195279][T10043] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 531.203244][T10043] Kernel panic - not syncing: Fatal exception [ 531.211035][T10043] Kernel Offset: disabled [ 531.215370][T10043] Rebooting in 86400 seconds..