Hi, I found this on 5.17.0-rc3 in linux-block repo :- [ 139.001745] ------------[ cut here ]------------ [ 139.001852] WARNING: CPU: 13 PID: 288 at block/bfq-iosched.c:602 bfqq_request_over_limit+0x130/0x5f0 [bfq] [ 139.001864] Modules linked in: loop(O) snd_seq_dummy snd_hrtimer snd_seq snd_seq_device snd_timer snd soundcore nf_conntrack_netbios_ns nf_conntrack_broadcast nft_ct ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set nf_tables rfkill nfnetlink ip6table_filter ip6_tables iptable_filter tun sunrpc ext4 intel_rapl_msr xfs intel_rapl_common mbcache jbd2 kvm_amd ccp ppdev kvm bfq parport_pc irqbypass joydev parport i2c_piix4 pcspkr sch_fq_codel zram ip_tables virtio_net net_failover failover bochs crct10dif_pclmul crc32_pclmul drm_vram_helper sr_mod drm_kms_helper syscopyarea cdrom sysfillrect sd_mod sysimgblt fb_sys_fops drm_ttm_helper ata_generic ttm ghash_clmulni_intel virtio_pci pata_acpi aesni_intel virtio nvme drm crypto_simd ata_piix virtio_pci_legacy_dev nvme_core cryptd virtio_pci_modern_dev serio_raw t10_pi i2c_core virtio_ring libata btrfs blake2b_generic [ 139.002071] libcrc32c crc32c_intel xor raid6_pq zstd_compress fuse [ 139.002088] CPU: 13 PID: 288 Comm: kworker/u96:37 Tainted: G O 5.17.0-rc3blk+ #51 [ 139.002092] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 139.002096] Workqueue: loop3 loop_rootcg_workfn [loop] [ 139.002104] RIP: 0010:bfqq_request_over_limit+0x130/0x5f0 [bfq] [ 139.002112] Code: 1c c7 48 8b 53 60 48 83 c0 01 48 85 d2 0f 84 f2 02 00 00 48 89 d3 44 0f b6 7b 18 89 c6 45 84 ff 0f 84 75 02 00 00 39 c1 7f d0 <0f> 0b 44 8d 70 ff 39 c8 0f 85 d9 02 00 00 41 83 fe ff 0f 84 59 02 [ 139.002115] RSP: 0018:ffffc90000b3f8c0 EFLAGS: 00010046 [ 139.002121] RAX: 0000000000000001 RBX: ffff888ff41e6098 RCX: 0000000000000001 [ 139.002124] RDX: ffff888ff41e6098 RSI: 0000000000000001 RDI: ffffc90000b3f8e0 [ 139.002127] RBP: 0000000000000001 R08: 000000205d25cc8d R09: 0000000099a1464b [ 139.002130] R10: 0000000000000001 R11: 0000000000000000 R12: ffff888141bf4b40 [ 139.002132] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000001 [ 139.002137] FS: 0000000000000000(0000) GS:ffff888ff7200000(0000) knlGS:0000000000000000 [ 139.002140] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 139.002144] CR2: 00007fbb7c000950 CR3: 0000000002612000 CR4: 0000000000350ee0 [ 139.002149] Call Trace: [ 139.002152] <TASK> [ 139.002163] ? kvm_sched_clock_read+0x14/0x40 [ 139.002170] ? sched_clock_cpu+0xb/0xc0 [ 139.002185] ? mark_held_locks+0x50/0x80 [ 139.002195] ? __raw_spin_unlock_irqrestore+0x5b/0x70 [ 139.002208] bfq_limit_depth+0xf1/0x2b0 [bfq] [ 139.002225] __blk_mq_alloc_requests+0x77/0x160 [ 139.002234] blk_mq_get_new_requests+0x117/0x2a0 [ 139.002253] blk_mq_submit_bio+0x341/0x5f0 [ 139.002269] submit_bio_noacct+0xce/0x130 [ 139.002284] iomap_dio_bio_iter+0x343/0x440 [ 139.002305] __iomap_dio_rw+0x1b6/0x4e0 [ 139.002362] iomap_dio_rw+0xa/0x30 [ 139.002366] xfs_file_dio_write_aligned+0x9b/0x100 [xfs] [ 139.002465] ? __kmalloc+0x1ee/0x3d0 [ 139.002477] xfs_file_write_iter+0xd8/0x130 [xfs] [ 139.002564] lo_rw_aio.isra.0+0x225/0x2a0 [loop] [ 139.002586] loop_process_work+0xa3/0x6f0 [loop] [ 139.002611] ? lock_acquire+0xfe/0x140 [ 139.002626] process_one_work+0x250/0x580 [ 139.002650] worker_thread+0x55/0x3b0 [ 139.002661] ? process_one_work+0x580/0x580 [ 139.002666] kthread+0xe3/0x100 [ 139.002671] ? kthread_complete_and_exit+0x20/0x20 [ 139.002682] ret_from_fork+0x22/0x30 [ 139.002714] </TASK> [ 139.002717] irq event stamp: 84144 [ 139.002719] hardirqs last enabled at (84143): [<ffffffff8111e18b>] __raw_spin_unlock_irqrestore+0x5b/0x70 [ 139.002724] hardirqs last disabled at (84144): [<ffffffff8111e077>] __raw_spin_lock_irq+0x67/0x90 [ 139.002728] softirqs last enabled at (83910): [<ffffffff81e00345>] __do_softirq+0x345/0x4b4 [ 139.002734] softirqs last disabled at (83895): [<ffffffff810a37bb>] __irq_exit_rcu+0xeb/0x140
