------------[ cut here ]------------ lockdep bfs error:-1 WARNING: CPU: 0 PID: 228 at kernel/locking/lockdep.c:1960 print_bfs_bug+0x130/0x1e0 kernel/locking/lockdep.c:1960 Modules linked in: CPU: 0 PID: 228 Comm: kworker/u4:5 Not tainted 5.9.0-rc7-next-20200930-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:print_bfs_bug+0x130/0x1e0 kernel/locking/lockdep.c:1960 Code: e2 08 00 74 2c 48 c7 c7 c0 7f a6 8d e8 49 51 01 00 66 90 85 db 75 05 5b 5d 41 5c c3 89 ee 48 c7 c7 20 e8 ab 88 e8 7b e5 c0 06 <0f> 0b 5b 5d 41 5c c3 0f 0b e8 62 82 e9 06 85 c0 74 d7 48 c7 c0 38 RSP: 0018:ffffc900012963b8 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff8880a8bf6080 RSI: ffffffff815df1a5 RDI: fffff52000252c69 RBP: 00000000ffffffff R08: 0000000000000001 R09: ffff8880ae420f8b R10: 0000000000000000 R11: 207065646b636f6c R12: ffff8880a8bf6080 R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052e038 CR3: 000000005d592000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: check_irq_usage+0x6b4/0xc60 kernel/locking/lockdep.c:2585 check_prev_add kernel/locking/lockdep.c:2823 [inline] check_prevs_add kernel/locking/lockdep.c:2944 [inline] validate_chain kernel/locking/lockdep.c:3562 [inline] __lock_acquire+0x2873/0x56d0 kernel/locking/lockdep.c:4796 lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 alloc_object lib/debugobjects.c:239 [inline] __debug_object_init+0x5c6/0xd10 lib/debugobjects.c:548 scsi_initialize_rq drivers/scsi/scsi_lib.c:1104 [inline] scsi_init_command+0x56d/0x770 drivers/scsi/scsi_lib.c:1134 scsi_mq_prep_fn drivers/scsi/scsi_lib.c:1590 [inline] scsi_queue_rq+0xaf6/0x3220 drivers/scsi/scsi_lib.c:1686 blk_mq_dispatch_rq_list+0x3a5/0x1e40 block/blk-mq.c:1388 __blk_mq_do_dispatch_sched+0x3bc/0x890 block/blk-mq-sched.c:186 blk_mq_do_dispatch_sched block/blk-mq-sched.c:199 [inline] __blk_mq_sched_dispatch_requests+0x361/0x490 block/blk-mq-sched.c:315 blk_mq_sched_dispatch_requests+0xfb/0x180 block/blk-mq-sched.c:341 __blk_mq_run_hw_queue+0x13a/0x2d0 block/blk-mq.c:1535 __blk_mq_delay_run_hw_queue+0x522/0x5f0 block/blk-mq.c:1612 blk_mq_run_hw_queue+0x16c/0x2f0 block/blk-mq.c:1665 blk_mq_sched_insert_requests+0x286/0x620 block/blk-mq-sched.c:539 blk_mq_flush_plug_list+0x3d8/0x560 block/blk-mq.c:1935 blk_flush_plug_list+0x4d/0x60 block/blk-core.c:1755 blk_mq_submit_bio+0xb0c/0x1750 block/blk-mq.c:2220 __submit_bio_noacct_mq block/blk-core.c:1023 [inline] submit_bio_noacct+0xc78/0x12b0 block/blk-core.c:1056 submit_bio+0x263/0x5b0 block/blk-core.c:1126 submit_bh_wbc+0x685/0x8e0 fs/buffer.c:3091 __block_write_full_page+0x837/0x12e0 fs/buffer.c:1847 block_write_full_page+0x205/0x260 fs/buffer.c:3017 __writepage+0x60/0x170 mm/page-writeback.c:2311 write_cache_pages+0x754/0x1190 mm/page-writeback.c:2246 generic_writepages mm/page-writeback.c:2337 [inline] generic_writepages+0xe2/0x150 mm/page-writeback.c:2326 do_writepages+0xec/0x290 mm/page-writeback.c:2352 __writeback_single_inode+0x122/0x1180 fs/fs-writeback.c:1461 writeback_sb_inodes+0x53d/0xef0 fs/fs-writeback.c:1721 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1790 wb_writeback+0x814/0xc40 fs/fs-writeback.c:1896 wb_check_old_data_flush fs/fs-writeback.c:1998 [inline] wb_do_writeback fs/fs-writeback.c:2051 [inline] wb_workfn+0x891/0x12d0 fs/fs-writeback.c:2080 process_one_work+0x933/0x15a0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296