------------[ cut here ]------------ WARNING: CPU: 1 PID: 2793 at kernel/kthread.c:819 queuing_blocked kernel/kthread.c:819 [inline] WARNING: CPU: 1 PID: 2793 at kernel/kthread.c:819 kthread_queue_work+0x16d/0x1b0 kernel/kthread.c:866 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 2793 Comm: kworker/1:1H Not tainted 5.8.0-rc4-next-20200708-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_run_work_fn Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:542 RIP: 0010:queuing_blocked kernel/kthread.c:819 [inline] RIP: 0010:kthread_queue_work+0x16d/0x1b0 kernel/kthread.c:866 Code: 0f 85 72 ff ff ff e8 62 49 26 00 48 8d 55 48 4c 89 e6 48 89 ef e8 63 ec ff ff 41 bc 01 00 00 00 e9 56 ff ff ff e8 43 49 26 00 <0f> 0b 45 31 e4 e9 47 ff ff ff 48 c7 c7 f4 61 af 8a e8 dd fd 65 00 RSP: 0018:ffffc900091078e8 EFLAGS: 00010093 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff814db478 RDX: ffff88809e7e6280 RSI: ffffffff814db4ed RDI: ffff8882187341c0 RBP: ffff888218734158 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a1470668 R13: 0000000000000286 R14: ffff888218734160 R15: dffffc0000000000 loop_queue_rq+0x428/0x590 drivers/block/loop.c:2027 blk_mq_dispatch_rq_list+0x2e0/0x1e40 block/blk-mq.c:1389 __blk_mq_do_dispatch_sched+0x3bc/0x870 block/blk-mq-sched.c:194 blk_mq_do_dispatch_sched block/blk-mq-sched.c:207 [inline] __blk_mq_sched_dispatch_requests+0x394/0x490 block/blk-mq-sched.c:323 blk_mq_sched_dispatch_requests+0xfb/0x180 block/blk-mq-sched.c:349 __blk_mq_run_hw_queue+0x13a/0x2d0 block/blk-mq.c:1529 blk_mq_run_work_fn+0x55/0x70 block/blk-mq.c:1807 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Kernel Offset: disabled Rebooting in 86400 seconds..