------------[ cut here ]------------ WARNING: CPU: 1 PID: 8801 at kernel/kthread.c:819 queuing_blocked kernel/kthread.c:819 [inline] WARNING: CPU: 1 PID: 8801 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: 8801 Comm: syz-executor.4 Not tainted 5.8.0-rc4-next-20200708-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:ffffc90004b6efa0 EFLAGS: 00010012 RAX: 00000000000045a2 RBX: 0000000000000001 RCX: ffffc90011c75000 RDX: 0000000000040000 RSI: ffffffff814db4ed RDI: ffff8882187191c0 RBP: ffff888218719158 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a1bd7128 R13: 0000000000000286 R14: ffff888218719160 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_delay_run_hw_queue+0x522/0x5f0 block/blk-mq.c:1606 blk_mq_run_hw_queue+0x16c/0x2f0 block/blk-mq.c:1659 blk_mq_sched_insert_requests+0x286/0x620 block/blk-mq-sched.c:603 blk_mq_flush_plug_list+0x3d8/0x560 block/blk-mq.c:1928 blk_flush_plug_list block/blk-core.c:1867 [inline] blk_finish_plug block/blk-core.c:1884 [inline] blk_finish_plug+0x83/0xe0 block/blk-core.c:1880 read_pages+0x4a5/0x8d0 mm/readahead.c:150 page_cache_readahead_unbounded+0x572/0x850 mm/readahead.c:244 __do_page_cache_readahead mm/readahead.c:273 [inline] ra_submit mm/internal.h:64 [inline] ondemand_readahead+0x5f5/0xee0 mm/readahead.c:551 page_cache_sync_readahead mm/readahead.c:585 [inline] page_cache_sync_readahead+0xee/0x130 mm/readahead.c:567 generic_file_buffered_read+0x159d/0x3150 mm/filemap.c:2058 generic_file_read_iter+0x396/0x4e0 mm/filemap.c:2362 blkdev_read_iter+0x11b/0x180 fs/block_dev.c:2021 call_read_iter include/linux/fs.h:1873 [inline] generic_file_splice_read+0x44c/0x6c0 fs/splice.c:312 do_splice_to+0x179/0x1f0 fs/splice.c:765 splice_direct_to_actor+0x307/0x980 fs/splice.c:849 do_splice_direct+0x1b3/0x280 fs/splice.c:958 do_sendfile+0x559/0xc30 fs/read_write.c:1557 __do_sys_sendfile64 fs/read_write.c:1618 [inline] __se_sys_sendfile64 fs/read_write.c:1604 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1604 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f8bdb8b4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00000000004fdc20 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000024002e00 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000907 R14: 00000000004cbed0 R15: 00007f8bdb8b56d4 Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds..