Backtrace

WARNING: CPU: 5 PID: 1768375 at block/bfq-iosched.c:606 bfqq_request_over_limit+0x31f/0x380
Modules linked in: cfg80211 rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache netfs snd_seq_dummy snd_hrtimer xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT bridge stp llc rpcrdma rdma_cm iw_cm ib_cm ib_core nf_nat_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast nft_objref nf_conntrack_tftp nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat 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 binfmt_misc xfs vfat fat uvcvideo snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_intel videobuf2_vmalloc snd_intel_dspcfg snd_usb_audio videobuf2_memops snd_intel_sdw_acpi videobuf2_v4l2 snd_hda_codec videobuf2_common snd_usbmidi_lib videodev snd_hda_core snd_rawmidi mc intel_rapl_msr snd_hwdep
 dell_wmi intel_rapl_common snd_seq x86_pkg_temp_thermal snd_seq_device snd_pcm intel_powerclamp ledtrig_audio snd_timer coretemp snd iTCO_wdt intel_pmc_bxt iTCO_vendor_support mei_wdt kvm_intel soundcore kvm at24 dell_smbios mei_pxp dcdbas mei_hdcp i2c_i801 sparse_keymap i2c_smbus dell_wmi_descriptor mei_me mei lpc_ich irqbypass pcspkr rapl intel_cstate intel_uncore wmi_bmof nfsd auth_rpcgss nfs_acl lockd grace sunrpc zram ip_tables amdgpu iommu_v2 gpu_sched i915 radeon drm_ttm_helper i2c_algo_bit crct10dif_pclmul ttm crc32_pclmul drm_kms_helper crc32c_intel ghash_clmulni_intel cec r8169 e1000e drm wmi video ipmi_devintf ipmi_msghandler fuse
CPU: 5 PID: 1768375 Comm: DOMCacheThread Not tainted 5.17.4-100.fc34.x86_64 #1
Hardware name: Dell Inc. OptiPlex 9020/06X1TJ, BIOS A25 05/30/2019
RIP: 0010:bfqq_request_over_limit+0x31f/0x380
Code: 8b 7c 24 08 e8 52 77 bb ff 58 e8 1c 29 b2 ff 48 8d 5c 24 28 e9 ca fe ff ff 44 8b 6c 24 24 41 39 f5 0f 84 28 fe ff ff 41 89 f5 <0f> 0b e9 08 fe ff ff 4c 8d a4 24 a8 00 00 00 44 89 c1 be 10 00 00
RSP: 0018:ffffb1dd83f7b840 EFLAGS: 00010002
RAX: 0000000000000002 RBX: 0000000000000018 RCX: ffffb1dd83f7b868
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff996d09dcc430
RBP: ffff996d08145680 R08: ffff996d09f1b720 R09: 0000000000000000
R10: 0000000000000001 R11: ffff99702edd5d80 R12: 0000000000000006
R13: 0000000000000001 R14: ffff996d1bcae098 R15: 0000000000000001
FS:  00007f5f744a4640(0000) GS:ffff99701eb40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f26550000 CR3: 0000000133d3c002 CR4: 00000000001706e0
Call Trace:
 <TASK>
 ? __sbitmap_get_word+0x30/0x80
 ? sbitmap_get_shallow+0x89/0x180
 bfq_limit_depth+0x125/0x1d0
 __blk_mq_alloc_requests+0x23b/0x2a0
 blk_mq_submit_bio+0x3da/0x640
 submit_bio_noacct+0x232/0x280
 ext4_bio_write_page+0x1fd/0x6c0
 mpage_submit_page+0x46/0x80
 mpage_process_page_bufs+0x11e/0x130
 mpage_prepare_extent_to_map+0x1bf/0x2a0
 ext4_writepages+0x22b/0x1050
 ? jbd2_journal_stop+0x12a/0x2c0
 ? __ext4_journal_stop+0x37/0xa0
 ? __mark_inode_dirty+0x126/0x350
 do_writepages+0xbf/0x1b0
 filemap_fdatawrite_wbc+0x62/0x90
 file_write_and_wait_range+0x78/0xc0
 ext4_sync_file+0x73/0x370
 __x64_sys_fsync+0x33/0x60
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f5fa8887ebb
Code: 4a 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 53 f7 ff ff 8b 7c 24 0c 41 89 c0 b8 4a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 b1 f7 ff ff 8b 44
RSP: 002b:00007f5f744a3130 EFLAGS: 00000293 ORIG_RAX: 000000000000004a
RAX: ffffffffffffffda RBX: 00007f5f6b9bf3a0 RCX: 00007f5fa8887ebb
RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000077
RBP: 000000000000022f R08: 0000000000000000 R09: 00007f5fa425c840
R10: 00007ffe77182080 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000000085 R14: 00007f5f73799d80 R15: 00007f5f737297a0
 </TASK>