[bug report] WARNING: CPU: 3 PID: 175811 at io_uring/io_uring.c:2921 io_ring_exit_work+0x155/0x288

[Changhui Zhong <czhong@redhat.com>]

Hello,

the following warnning info was triggered by ubdsrv  generic/004 tests,
please help check and let me know if you need any info/test, thanks.

repo: https://github.com/torvalds/linux.git
branch: master
INFO: HEAD of cloned kernel
commit 86731a2a651e58953fc949573895f2fa6d456841
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sun Jun 22 13:30:08 2025 -0700

    Linux 6.16-rc3


reproducer:
# echo 0 > /proc/sys/kernel/io_uring_disabled
# modprobe ublk_drv
# for i in {0..30};do make test T=generic; done

dmesg log:
[61128.578684] running generic/004
[61133.356428] blk_print_req_error: 525 callbacks suppressed
[61133.356435] I/O error, dev ublkb0, sector 230760 op 0x0:(READ)
flags 0x0 phys_seg 3 prio class 0
[61133.372322] I/O error, dev ublkb0, sector 233744 op 0x1:(WRITE)
flags 0x8800 phys_seg 1 prio class 0
[61133.382529] I/O error, dev ublkb0, sector 230384 op 0x0:(READ)
flags 0x0 phys_seg 2 prio class 0
[61133.392341] I/O error, dev ublkb0, sector 233752 op 0x1:(WRITE)
flags 0x8800 phys_seg 1 prio class 0
[61133.402540] I/O error, dev ublkb0, sector 230400 op 0x0:(READ)
flags 0x0 phys_seg 6 prio class 0
[61133.412354] I/O error, dev ublkb0, sector 233760 op 0x1:(WRITE)
flags 0x8800 phys_seg 1 prio class 0
[61133.422556] I/O error, dev ublkb0, sector 230448 op 0x0:(READ)
flags 0x0 phys_seg 3 prio class 0
[61133.432370] I/O error, dev ublkb0, sector 233768 op 0x1:(WRITE)
flags 0x8800 phys_seg 2 prio class 0
[61133.442571] I/O error, dev ublkb0, sector 233816 op 0x1:(WRITE)
flags 0x8800 phys_seg 2 prio class 0
[61133.452773] I/O error, dev ublkb0, sector 230568 op 0x0:(READ)
flags 0x0 phys_seg 2 prio class 0
[61133.474450] buffer_io_error: 2 callbacks suppressed
[61133.474456] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61133.487907] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61133.495823] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61133.503706] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61133.511584] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61133.519459] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61135.776566] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61135.784574] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61135.792489] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61135.800385] Buffer I/O error on dev ublkb0, logical block 0, async page read
[-- MARK -- Tue Jun 24 05:10:00 2025]
[61140.252443] blk_print_req_error: 761 callbacks suppressed
[61140.252450] I/O error, dev ublkb0, sector 229072 op 0x0:(READ)
flags 0x0 phys_seg 1 prio class 0
[61140.268331] I/O error, dev ublkb0, sector 229192 op 0x0:(READ)
flags 0x0 phys_seg 2 prio class 0
[61140.278151] I/O error, dev ublkb0, sector 228992 op 0x0:(READ)
flags 0x0 phys_seg 2 prio class 0
[61140.287963] I/O error, dev ublkb0, sector 229344 op 0x0:(READ)
flags 0x0 phys_seg 3 prio class 0
[61140.297777] I/O error, dev ublkb0, sector 229080 op 0x1:(WRITE)
flags 0x8800 phys_seg 1 prio class 0
[61140.307977] I/O error, dev ublkb0, sector 229080 op 0x0:(READ)
flags 0x0 phys_seg 1 prio class 0
[61140.317793] I/O error, dev ublkb0, sector 229008 op 0x0:(READ)
flags 0x0 phys_seg 2 prio class 0
[61140.327604] I/O error, dev ublkb0, sector 229208 op 0x0:(READ)
flags 0x0 phys_seg 4 prio class 0
[61140.337419] I/O error, dev ublkb0, sector 229208 op 0x1:(WRITE)
flags 0x8800 phys_seg 6 prio class 0
[61140.347636] I/O error, dev ublkb0, sector 229088 op 0x1:(WRITE)
flags 0x8800 phys_seg 1 prio class 0
[61140.368546] buffer_io_error: 8 callbacks suppressed
[61140.368550] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61140.381994] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61140.389904] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61140.397794] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61140.405676] Buffer I/O error on dev ublkb0, logical block 0, async page read
[61140.413552] Buffer I/O error on dev ublkb0, logical block 0, async page read
[-- MARK -- Tue Jun 24 05:15:00 2025]
[61449.365065] ------------[ cut here ]------------
[61449.370245] WARNING: CPU: 3 PID: 175811 at io_uring/io_uring.c:2921
io_ring_exit_work+0x155/0x288
[61449.380178] Modules linked in: ublk_drv rpcsec_gss_krb5 auth_rpcgss
nfsv4 dns_resolver nfs lockd grace nfs_localio netfs sunrpc rfkill
intel_rapl_msr intel_rapl_common intel_uncore_frequency
intel_uncore_frequency_common i10nm_edac skx_edac_common nfit
libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
irqbypass dax_hmem rapl cxl_acpi cxl_port intel_cstate ipmi_ssif
cdc_ether iTCO_wdt cxl_core iTCO_vendor_support usbnet mgag200 mii
intel_uncore tg3 ioatdma einj i2c_i801 pcspkr intel_th_gth
isst_if_mbox_pci mei_me isst_if_mmio i2c_algo_bit acpi_power_meter
intel_th_pci mei i2c_smbus isst_if_common intel_vsec intel_th
intel_pch_thermal dca ipmi_si acpi_ipmi ipmi_devintf ipmi_msghandler
acpi_pad sg fuse loop dm_multipath nfnetlink xfs sd_mod ahci libahci
libata ghash_clmulni_intel wmi dm_mirror dm_region_hash dm_log dm_mod
[last unloaded: ublk_drv]
[61449.465875] CPU: 3 UID: 0 PID: 175811 Comm: kworker/u96:2 Tainted:
G S                  6.16.0-rc3 #1 PREEMPT(voluntary)
[61449.478116] Tainted: [S]=CPU_OUT_OF_SPEC
[61449.482501] Hardware name: Lenovo ThinkSystem SR650 V2/7Z73CTO1WW,
BIOS AFE118M-1.32 06/29/2022
[61449.492218] Workqueue: iou_exit io_ring_exit_work
[61449.497476] RIP: 0010:io_ring_exit_work+0x155/0x288
[61449.502929] Code: e8 00 76 6f 00 4c 89 f7 e8 68 d2 6e 00 4c 89 e7
e8 a0 e9 ff ff 31 c9 48 89 4c 24 10 48 8b 05 a2 0e 9e 01 48 39 44 24
08 79 08 <0f> 0b 41 bd 60 ea 00 00 48 8d 7b 30 4c 89 ee e8 b7 d1 e4 00
48 85
[61449.523892] RSP: 0018:ff8b5fc9cd4b3db0 EFLAGS: 00010297
[61449.529732] RAX: 0000000103a50f19 RBX: ff43740b38f6f410 RCX: 0000000000000000
[61449.537702] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff43740b38f6f040
[61449.545673] RBP: ff8b5fc9cd4b3e40 R08: ff43740a80400790 R09: ffffffffa42588e0
[61449.553645] R10: 0000000000000000 R11: 0000000000000000 R12: ff43740b38f6f000
[61449.561615] R13: 0000000000000032 R14: 0000000000000000 R15: ff43740b38f6f040
[61449.569588] FS:  0000000000000000(0000) GS:ff43740e0a985000(0000)
knlGS:0000000000000000
[61449.578627] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[61449.585045] CR2: 00007fbc9c500790 CR3: 00000002ce024002 CR4: 0000000000773ef0
[61449.593017] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[61449.600993] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[61449.608964] PKRU: 55555554
[61449.611989] Call Trace:
[61449.614724]  <TASK>
[61449.617070]  process_one_work+0x188/0x340
[61449.621556]  worker_thread+0x257/0x3a0
[61449.625747]  ? __pfx_worker_thread+0x10/0x10
[61449.630519]  kthread+0xfc/0x240
[61449.634031]  ? __pfx_kthread+0x10/0x10
[61449.638221]  ? __pfx_kthread+0x10/0x10
[61449.642412]  ret_from_fork+0xed/0x110
[61449.646507]  ? __pfx_kthread+0x10/0x10
[61449.650696]  ret_from_fork_asm+0x1a/0x30
[61449.655084]  </TASK>
[61449.657526] ---[ end trace 0000000000000000 ]---
[61730.255363] running generic/005
[61732.466565] blk_print_req_error: 397 callbacks suppressed
[61732.466573] I/O error, dev ublkb1, sector 2094968 op 0x1:(WRITE)
flags 0x8800 phys_seg 1 prio class 0


Best Regards,
Changhui