[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 76.539324][ T27] audit: type=1800 audit(1584594307.317:25): pid=9331 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 76.559952][ T27] audit: type=1800 audit(1584594307.317:26): pid=9331 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 76.617675][ T27] audit: type=1800 audit(1584594307.317:27): pid=9331 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 '10.128.1.22' (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 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: [ 631.963062][T10374] general protection fault, probably for non-canonical address 0xdffffc0000000030: 0000 [#1] PREEMPT SMP KASAN [ 631.974873][T10374] KASAN: null-ptr-deref in range [0x0000000000000180-0x0000000000000187] [ 631.983338][T10374] CPU: 0 PID: 10374 Comm: blkid Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 631.992456][T10374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 632.007082][T10374] RIP: 0010:__queue_work+0xe8/0x1280 [ 632.012361][T10374] 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 [ 632.032142][T10374] RSP: 0018:ffffc900034c7078 EFLAGS: 00010006 [ 632.038187][T10374] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 632.046316][T10374] RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001 [ 632.054271][T10374] RBP: 0000000000000040 R08: ffff8880a8d72340 R09: fffffbfff18f84a6 [ 632.062268][T10374] R10: fffffbfff18f84a5 R11: ffffffff8c7c252b R12: ffff8880a3b66818 [ 632.070221][T10374] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040 [ 632.078189][T10374] FS: 00007feb63ce7740(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 632.087100][T10374] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 632.093667][T10374] CR2: 0000000002386058 CR3: 000000009ffc3000 CR4: 00000000001406f0 [ 632.101618][T10374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 632.111303][T10374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 632.119272][T10374] Call Trace: [ 632.122631][T10374] ? free_object+0x70/0x70 [ 632.127094][T10374] ? kmem_cache_alloc_trace+0x390/0x7d0 [ 632.132640][T10374] queue_work_on+0x18b/0x200 [ 632.137294][T10374] loop_queue_rq+0x5ac/0x1050 [ 632.141982][T10374] ? find_held_lock+0x2d/0x110 [ 632.146766][T10374] blk_mq_dispatch_rq_list+0x997/0x17f0 [ 632.152307][T10374] ? lock_downgrade+0x701/0x7f0 [ 632.157142][T10374] ? lock_downgrade+0x7f0/0x7f0 [ 632.162048][T10374] ? elv_rb_del+0x50/0x90 [ 632.166365][T10374] ? elv_rqhash_del+0x114/0x160 [ 632.171212][T10374] ? blk_mq_get_driver_tag+0x540/0x540 [ 632.176731][T10374] ? _raw_spin_unlock+0x24/0x40 [ 632.181611][T10374] ? dd_dispatch_request+0x240/0x8b0 [ 632.186909][T10374] blk_mq_do_dispatch_sched+0x188/0x3f0 [ 632.192439][T10374] ? blk_mq_sched_free_hctx_data+0x1e0/0x1e0 [ 632.198585][T10374] ? __lock_acquire+0x827/0x5270 [ 632.203857][T10374] blk_mq_sched_dispatch_requests+0x3cd/0x650 [ 632.209925][T10374] ? lock_acquire+0x197/0x420 [ 632.214586][T10374] ? blk_mq_sched_restart+0x90/0x90 [ 632.219828][T10374] ? rcu_dynticks_curr_cpu_in_eqs+0x4f/0xb0 [ 632.225790][T10374] __blk_mq_run_hw_queue+0x1b8/0x2c0 [ 632.231070][T10374] ? blk_mq_hctx_mark_pending+0x240/0x240 [ 632.236770][T10374] ? lock_acquire+0x197/0x420 [ 632.241425][T10374] ? hctx_lock+0x7f/0x1d0 [ 632.245734][T10374] __blk_mq_delay_run_hw_queue+0x522/0x5e0 [ 632.251519][T10374] blk_mq_run_hw_queue+0x16c/0x2f0 [ 632.256611][T10374] ? blk_mq_delay_run_hw_queue+0x30/0x30 [ 632.262243][T10374] ? dd_dispatch_request+0x8b0/0x8b0 [ 632.267618][T10374] blk_mq_sched_insert_requests+0x2d4/0x5f0 [ 632.273488][T10374] blk_mq_flush_plug_list+0x452/0x880 [ 632.278916][T10374] ? mpage_readpages+0x4c4/0x670 [ 632.283840][T10374] ? blk_mq_insert_requests+0x640/0x640 [ 632.289395][T10374] ? do_mpage_readpage+0x1fd0/0x1fd0 [ 632.294677][T10374] blk_flush_plug_list+0x2ff/0x460 [ 632.299797][T10374] ? blk_insert_cloned_request+0x500/0x500 [ 632.305722][T10374] ? put_pages_list+0x16/0x400 [ 632.310519][T10374] blk_finish_plug+0x50/0x97 [ 632.315206][T10374] ? blkdev_write_begin+0x40/0x40 [ 632.320222][T10374] read_pages+0x125/0x610 [ 632.324537][T10374] ? read_cache_pages+0x750/0x750 [ 632.329541][T10374] ? 0xffffffff81000000 [ 632.333746][T10374] ? __page_cache_alloc+0x110/0x480 [ 632.338932][T10374] __do_page_cache_readahead+0x47c/0x570 [ 632.344550][T10374] ? read_pages+0x610/0x610 [ 632.349040][T10374] ? lock_downgrade+0x7f0/0x7f0 [ 632.354058][T10374] force_page_cache_readahead+0x1dc/0x320 [ 632.359757][T10374] page_cache_sync_readahead+0x4b8/0x520 [ 632.365386][T10374] generic_file_read_iter+0x1650/0x2a40 [ 632.371963][T10374] ? lock_downgrade+0x7f0/0x7f0 [ 632.376795][T10374] ? filemap_write_and_wait_range+0x1e0/0x1e0 [ 632.384296][T10374] ? aa_file_perm+0x5d2/0x14d0 [ 632.389093][T10374] ? mem_cgroup_throttle_swaprate+0x190/0x64b [ 632.395148][T10374] ? aa_path_link+0x300/0x300 [ 632.399890][T10374] ? __handle_mm_fault+0x28a1/0x3af0 [ 632.405180][T10374] ? __this_cpu_preempt_check+0x28/0x190 [ 632.410880][T10374] blkdev_read_iter+0x11b/0x180 [ 632.418181][T10374] new_sync_read+0x4a2/0x790 [ 632.422804][T10374] ? vfs_dedupe_file_range+0x750/0x750 [ 632.428306][T10374] ? security_file_permission+0x8a/0x370 [ 632.433991][T10374] __vfs_read+0xc9/0x100 [ 632.438231][T10374] vfs_read+0x1ea/0x430 [ 632.442385][T10374] ksys_read+0x127/0x250 [ 632.446604][T10374] ? kernel_write+0x120/0x120 [ 632.451316][T10374] ? trace_hardirqs_off_caller+0x55/0x230 [ 632.457197][T10374] do_syscall_64+0xf6/0x790 [ 632.461729][T10374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 632.467606][T10374] RIP: 0033:0x7feb635ef310 [ 632.472001][T10374] 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 [ 632.491586][T10374] RSP: 002b:00007ffcfa5a7b48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 632.499980][T10374] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007feb635ef310 [ 632.507930][T10374] RDX: 0000000000000400 RSI: 0000000002385c58 RDI: 0000000000000003 [ 632.515887][T10374] RBP: 0000000002385c30 R08: 0000000000000028 R09: 0000000001680000 [ 632.523843][T10374] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002385030 [ 632.531792][T10374] R13: 0000000000000400 R14: 0000000002385080 R15: 0000000002385c48 [ 632.539834][T10374] Modules linked in: [ 632.543713][T10374] ---[ end trace dc628407eaa0d69b ]--- [ 632.549163][T10374] RIP: 0010:__queue_work+0xe8/0x1280 [ 632.554423][T10374] 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 [ 632.574009][T10374] RSP: 0018:ffffc900034c7078 EFLAGS: 00010006 [ 632.580065][T10374] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 632.588018][T10374] RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001 [ 632.595965][T10374] RBP: 0000000000000040 R08: ffff8880a8d72340 R09: fffffbfff18f84a6 [ 632.603918][T10374] R10: fffffbfff18f84a5 R11: ffffffff8c7c252b R12: ffff8880a3b66818 [ 632.611866][T10374] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040 [ 632.619816][T10374] FS: 00007feb63ce7740(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 632.628725][T10374] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 632.635284][T10374] CR2: 0000000002386058 CR3: 000000009ffc3000 CR4: 00000000001406f0 [ 632.643339][T10374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 632.651312][T10374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 632.659299][T10374] Kernel panic - not syncing: Fatal exception [ 632.666958][T10374] Kernel Offset: disabled [ 632.671545][T10374] Rebooting in 86400 seconds..