[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 78.715290][ T27] audit: type=1800 audit(1585808446.183:25): pid=9408 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 78.736182][ T27] audit: type=1800 audit(1585808446.203:26): pid=9408 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 78.774051][ T27] audit: type=1800 audit(1585808446.203:27): pid=9408 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 '10.128.10.44' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 105.886170][T10611] general protection fault, probably for non-canonical address 0xdffffc0000000030: 0000 [#1] PREEMPT SMP KASAN [ 105.903207][T10611] KASAN: null-ptr-deref in range [0x0000000000000180-0x0000000000000187] [ 105.911597][T10611] CPU: 1 PID: 10611 Comm: blkid Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 105.920686][T10611] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 105.930729][T10611] RIP: 0010:__queue_work+0xe8/0x1280 [ 105.935988][T10611] 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 [ 105.958616][T10611] RSP: 0018:ffffc900036d7078 EFLAGS: 00010006 [ 105.965618][T10611] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 105.973568][T10611] RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001 [ 105.981525][T10611] RBP: 0000000000000040 R08: ffff888093d4e600 R09: fffffbfff18fc846 [ 105.989485][T10611] R10: fffffbfff18fc845 R11: ffffffff8c7e422b R12: ffff88809e869918 [ 105.997454][T10611] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040 [ 106.005404][T10611] FS: 00007f7a68940740(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 106.014396][T10611] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 106.021016][T10611] CR2: 00007f7a682bef44 CR3: 00000000a89b1000 CR4: 00000000001406e0 [ 106.029222][T10611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 106.037173][T10611] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 106.045164][T10611] Call Trace: [ 106.048478][T10611] ? free_object+0x70/0x70 [ 106.052894][T10611] ? kmem_cache_alloc_trace+0x390/0x7d0 [ 106.058429][T10611] queue_work_on+0x18b/0x200 [ 106.062999][T10611] loop_queue_rq+0x5ac/0x1050 [ 106.067654][T10611] ? find_held_lock+0x2d/0x110 [ 106.072405][T10611] blk_mq_dispatch_rq_list+0x997/0x17f0 [ 106.077937][T10611] ? lock_downgrade+0x701/0x7f0 [ 106.082769][T10611] ? lock_downgrade+0x7f0/0x7f0 [ 106.087598][T10611] ? elv_rb_del+0x50/0x90 [ 106.091905][T10611] ? elv_rqhash_del+0x114/0x160 [ 106.096748][T10611] ? blk_mq_get_driver_tag+0x540/0x540 [ 106.102186][T10611] ? _raw_spin_unlock+0x24/0x40 [ 106.107195][T10611] ? dd_dispatch_request+0x240/0x8b0 [ 106.112460][T10611] blk_mq_do_dispatch_sched+0x188/0x3f0 [ 106.117991][T10611] ? blk_mq_sched_free_hctx_data+0x1e0/0x1e0 [ 106.123956][T10611] ? __lock_acquire+0x827/0x5270 [ 106.128872][T10611] blk_mq_sched_dispatch_requests+0x3cd/0x650 [ 106.134935][T10611] ? lock_acquire+0x197/0x420 [ 106.139587][T10611] ? blk_mq_sched_restart+0x90/0x90 [ 106.144760][T10611] ? rcu_dynticks_curr_cpu_in_eqs+0x4f/0xb0 [ 106.150639][T10611] __blk_mq_run_hw_queue+0x1b8/0x2c0 [ 106.155909][T10611] ? blk_mq_hctx_mark_pending+0x240/0x240 [ 106.161602][T10611] ? lock_acquire+0x197/0x420 [ 106.166268][T10611] ? hctx_lock+0x7f/0x1d0 [ 106.170574][T10611] __blk_mq_delay_run_hw_queue+0x522/0x5e0 [ 106.176454][T10611] blk_mq_run_hw_queue+0x16c/0x2f0 [ 106.181540][T10611] ? blk_mq_delay_run_hw_queue+0x30/0x30 [ 106.187151][T10611] ? dd_dispatch_request+0x8b0/0x8b0 [ 106.192421][T10611] blk_mq_sched_insert_requests+0x2d4/0x5f0 [ 106.198289][T10611] blk_mq_flush_plug_list+0x452/0x880 [ 106.203643][T10611] ? mpage_readpages+0x4c4/0x670 [ 106.208566][T10611] ? blk_mq_insert_requests+0x640/0x640 [ 106.214120][T10611] ? do_mpage_readpage+0x1fd0/0x1fd0 [ 106.219535][T10611] blk_flush_plug_list+0x2ff/0x460 [ 106.224635][T10611] ? blk_insert_cloned_request+0x500/0x500 [ 106.230441][T10611] ? put_pages_list+0x16/0x400 [ 106.235199][T10611] blk_finish_plug+0x50/0x97 [ 106.239768][T10611] ? blkdev_write_begin+0x40/0x40 [ 106.244767][T10611] read_pages+0x125/0x610 [ 106.249074][T10611] ? read_cache_pages+0x750/0x750 [ 106.254073][T10611] ? 0xffffffff81000000 [ 106.258204][T10611] ? __page_cache_alloc+0x110/0x480 [ 106.263375][T10611] __do_page_cache_readahead+0x47c/0x570 [ 106.268984][T10611] ? read_pages+0x610/0x610 [ 106.273461][T10611] ? lock_downgrade+0x7f0/0x7f0 [ 106.278300][T10611] force_page_cache_readahead+0x1dc/0x320 [ 106.284015][T10611] page_cache_sync_readahead+0x4b8/0x520 [ 106.289635][T10611] generic_file_read_iter+0x1650/0x2a40 [ 106.295174][T10611] ? lock_downgrade+0x7f0/0x7f0 [ 106.300008][T10611] ? filemap_write_and_wait_range+0x1e0/0x1e0 [ 106.306065][T10611] ? aa_file_perm+0x5d2/0x14d0 [ 106.310826][T10611] ? __might_fault+0xef/0x1d0 [ 106.315480][T10611] ? aa_path_link+0x300/0x300 [ 106.320131][T10611] ? mark_lock+0xbc/0x1220 [ 106.324533][T10611] ? __might_fault+0x190/0x1d0 [ 106.329276][T10611] blkdev_read_iter+0x11b/0x180 [ 106.334113][T10611] new_sync_read+0x4a2/0x790 [ 106.338688][T10611] ? vfs_dedupe_file_range+0x750/0x750 [ 106.344127][T10611] ? security_file_permission+0x8a/0x370 [ 106.349735][T10611] __vfs_read+0xc9/0x100 [ 106.353952][T10611] vfs_read+0x1ea/0x430 [ 106.358350][T10611] ksys_read+0x127/0x250 [ 106.362569][T10611] ? kernel_write+0x120/0x120 [ 106.367275][T10611] ? trace_hardirqs_off_caller+0x55/0x230 [ 106.372988][T10611] do_syscall_64+0xf6/0x790 [ 106.377492][T10611] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.383365][T10611] RIP: 0033:0x7f7a68248310 [ 106.387809][T10611] 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 [ 106.407390][T10611] RSP: 002b:00007ffec73d2ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 106.415875][T10611] RAX: ffffffffffffffda RBX: 00000000080f0000 RCX: 00007f7a68248310 [ 106.423861][T10611] RDX: 0000000000000040 RSI: 00000000012dac58 RDI: 0000000000000003 [ 106.431861][T10611] RBP: 00000000012dac30 R08: 0000000000000068 R09: 0101010101010101 [ 106.439810][T10611] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000012da030 [ 106.447759][T10611] R13: 0000000000000040 R14: 00000000012da080 R15: 00000000012dac48 [ 106.455712][T10611] Modules linked in: [ 106.459603][T10611] ---[ end trace 90916a316701b8ae ]--- [ 106.465038][T10611] RIP: 0010:__queue_work+0xe8/0x1280 [ 106.470308][T10611] 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 [ 106.489888][T10611] RSP: 0018:ffffc900036d7078 EFLAGS: 00010006 [ 106.495925][T10611] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 106.503878][T10611] RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001 [ 106.511824][T10611] RBP: 0000000000000040 R08: ffff888093d4e600 R09: fffffbfff18fc846 [ 106.519771][T10611] R10: fffffbfff18fc845 R11: ffffffff8c7e422b R12: ffff88809e869918 [ 106.527802][T10611] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040 [ 106.535751][T10611] FS: 00007f7a68940740(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 106.544651][T10611] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 106.551205][T10611] CR2: 00007f7a682bef44 CR3: 00000000a89b1000 CR4: 00000000001406e0 [ 106.559167][T10611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 106.567153][T10611] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 106.575108][T10611] Kernel panic - not syncing: Fatal exception [ 106.582759][T10611] Kernel Offset: disabled [ 106.587086][T10611] Rebooting in 86400 seconds..