[bug report] WARNING: CPU: 2 PID: 3445306 at drivers/block/ublk_drv.c:2633 ublk_ctrl_start_recovery.constprop.0+0x74/0x180

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Hello,

I hit the kernel panic when running test ubdsrv  generic/005,
please help check it and let me know if you need any info/testing for
it, thanks.

repo:https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
branch:for-next
commit: b785211c726fbe77ff559f0241aab8d3dadd9988

dmesg log:
[ 7203.196155] ------------[ cut here ]------------
[ 7203.200779] WARNING: CPU: 2 PID: 3445306 at
drivers/block/ublk_drv.c:2633
ublk_ctrl_start_recovery.constprop.0+0x74/0x180
[ 7203.211732] Modules linked in: ext4 mbcache jbd2 raid10 raid1 raid0
dm_raid raid456 async_raid6_recov async_memcpy async_pq async_xor xor
async_tx raid6_pq loop nf_tables nfnetlink tls rpcsec_gss_krb5
auth_rpcgss nfsv4 dns_resolver nfs lockd grace netfs rfkill sunrpc
vfat fat dm_multipath intel_rapl_msr intel_rapl_common
intel_uncore_frequency intel_uncore_frequency_common i10nm_edac nfit
libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel
ipmi_ssif kvm mgag200 dax_hmem iTCO_wdt i2c_algo_bit rapl
iTCO_vendor_support cxl_acpi drm_shmem_helper intel_cstate cxl_core
drm_kms_helper acpi_power_meter mei_me dcdbas dell_smbios i2c_i801
intel_uncore einj isst_if_mmio isst_if_mbox_pci ipmi_si
dell_wmi_descriptor wmi_bmof pcspkr mei i2c_smbus isst_if_common
acpi_ipmi intel_vsec intel_pch_thermal ipmi_devintf ipmi_msghandler
drm fuse xfs libcrc32c sd_mod t10_pi sg ahci libahci crct10dif_pclmul
crc32_pclmul crc32c_intel libata tg3 ghash_clmulni_intel wmi dm_mirror
dm_region_hash dm_log dm_mod
[ 7203.211779]  [last unloaded: null_blk]
[ 7203.303523] CPU: 2 PID: 3445306 Comm: iou-wrk-3445292 Not tainted 6.9.0+ #1
[ 7203.310482] Hardware name: Dell Inc. PowerEdge R650xs/0PPTY2, BIOS
1.4.4 10/07/2021
[ 7203.318135] RIP: 0010:ublk_ctrl_start_recovery.constprop.0+0x74/0x180
[ 7203.324573] Code: 00 0f 84 9e 00 00 00 45 31 f6 bd ff ff ff ff 44
89 f3 41 0f af 5d 10 49 03 5d 08 48 8b 7b 10 48 85 ff 74 06 f6 47 2c
04 75 02 <0f> 0b 31 d2 4c 8d 47 28 89 e8 66 89 53 38 f0 0f c1 47 28 83
f8 01
[ 7203.343319] RSP: 0018:ff59ae67453ffce0 EFLAGS: 00010246
[ 7203.348544] RAX: 0000000000000002 RBX: ff2fabb3b5682000 RCX: 0000000000000000
[ 7203.355678] RDX: ff2fabb261e18000 RSI: ffffffffa324ee00 RDI: 0000000000000000
[ 7203.362812] RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffffa36e33e0
[ 7203.369943] R10: 0000000000000000 R11: 0000000000000000 R12: ff2fabb3ae44a468
[ 7203.377078] R13: ff2fabb3ae44a000 R14: 0000000000000000 R15: ff2fabb3ce150080
[ 7203.384210] FS:  00007fbed107c740(0000) GS:ff2fabb5af700000(0000)
knlGS:0000000000000000
[ 7203.392294] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7203.398041] CR2: 00007f4428078584 CR3: 000000011baa0004 CR4: 0000000000771ef0
[ 7203.405174] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 7203.412308] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 7203.419441] PKRU: 55555554
[ 7203.422151] Call Trace:
[ 7203.424605]  <TASK>
[ 7203.426713]  ? __warn+0x7f/0x120
[ 7203.429943]  ? ublk_ctrl_start_recovery.constprop.0+0x74/0x180
[ 7203.435778]  ? report_bug+0x18a/0x1a0
[ 7203.439445]  ? handle_bug+0x3c/0x70
[ 7203.442943]  ? exc_invalid_op+0x14/0x70
[ 7203.446782]  ? asm_exc_invalid_op+0x16/0x20
[ 7203.450970]  ? ublk_ctrl_start_recovery.constprop.0+0x74/0x180
[ 7203.456802]  ublk_ctrl_uring_cmd+0x4f7/0x6c0
[ 7203.461075]  ? pick_next_task_idle+0x26/0x40
[ 7203.465347]  io_uring_cmd+0x9a/0x1b0
[ 7203.468929]  io_issue_sqe+0x193/0x3f0
[ 7203.472602]  io_wq_submit_work+0x9b/0x390
[ 7203.476613]  io_worker_handle_work+0x165/0x360
[ 7203.481059]  io_wq_worker+0xcb/0x2f0
[ 7203.484640]  ? finish_task_switch.isra.0+0x203/0x290
[ 7203.489608]  ? finish_task_switch.isra.0+0x203/0x290
[ 7203.494572]  ? __pfx_io_wq_worker+0x10/0x10
[ 7203.498758]  ret_from_fork+0x2d/0x50
[ 7203.502338]  ? __pfx_io_wq_worker+0x10/0x10
[ 7203.506523]  ret_from_fork_asm+0x1a/0x30
[ 7203.510451]  </TASK>
[ 7203.512643] ---[ end trace 0000000000000000 ]---
[ 7203.517263] BUG: kernel NULL pointer dereference, address: 0000000000000028
[ 7203.524220] #PF: supervisor write access in kernel mode
[ 7203.529445] #PF: error_code(0x0002) - not-present page
[ 7203.534584] PGD 2761af067 P4D 442db4067 PUD 1727a2067 PMD 0
[ 7203.540244] Oops: Oops: 0002 [#1] PREEMPT SMP NOPTI
[ 7203.545123] CPU: 2 PID: 3445306 Comm: iou-wrk-3445292 Tainted: G
    W          6.9.0+ #1
[ 7203.553556] Hardware name: Dell Inc. PowerEdge R650xs/0PPTY2, BIOS
1.4.4 10/07/2021
[ 7203.561208] RIP: 0010:ublk_ctrl_start_recovery.constprop.0+0x82/0x180
[ 7203.567647] Code: ff 44 89 f3 41 0f af 5d 10 49 03 5d 08 48 8b 7b
10 48 85 ff 74 06 f6 47 2c 04 75 02 0f 0b 31 d2 4c 8d 47 28 89 e8 66
89 53 38 <f0> 0f c1 47 28 83 f8 01 0f 84 b5 00 00 00 85 c0 0f 8e b7 00
00 00
[ 7203.586395] RSP: 0018:ff59ae67453ffce0 EFLAGS: 00010246
[ 7203.591622] RAX: 00000000ffffffff RBX: ff2fabb3b5682000 RCX: 0000000000000000
[ 7203.598755] RDX: 0000000000000000 RSI: ffffffffa324ee00 RDI: 0000000000000000
[ 7203.605886] RBP: 00000000ffffffff R08: 0000000000000028 R09: ffffffffa36e33e0
[ 7203.613020] R10: 0000000000000000 R11: 0000000000000000 R12: ff2fabb3ae44a468
[ 7203.620153] R13: ff2fabb3ae44a000 R14: 0000000000000000 R15: ff2fabb3ce150080
[ 7203.627284] FS:  00007fbed107c740(0000) GS:ff2fabb5af700000(0000)
knlGS:0000000000000000
[ 7203.635371] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7203.641117] CR2: 0000000000000028 CR3: 000000011baa0004 CR4: 0000000000771ef0
[ 7203.648248] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 7203.655383] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 7203.662514] PKRU: 55555554
[ 7203.665227] Call Trace:
[ 7203.667681]  <TASK>
[ 7203.669785]  ? __die+0x20/0x70
[ 7203.672845]  ? page_fault_oops+0x75/0x170
[ 7203.676860]  ? exc_page_fault+0x64/0x140
[ 7203.680785]  ? asm_exc_page_fault+0x22/0x30
[ 7203.684969]  ? ublk_ctrl_start_recovery.constprop.0+0x82/0x180
[ 7203.690804]  ublk_ctrl_uring_cmd+0x4f7/0x6c0
[ 7203.695076]  ? pick_next_task_idle+0x26/0x40
[ 7203.699350]  io_uring_cmd+0x9a/0x1b0
[ 7203.702927]  io_issue_sqe+0x193/0x3f0
[ 7203.706595]  io_wq_submit_work+0x9b/0x390
[ 7203.710607]  io_worker_handle_work+0x165/0x360
[ 7203.715054]  io_wq_worker+0xcb/0x2f0
[ 7203.718633]  ? finish_task_switch.isra.0+0x203/0x290
[ 7203.723597]  ? finish_task_switch.isra.0+0x203/0x290
[ 7203.728564]  ? __pfx_io_wq_worker+0x10/0x10
[ 7203.732749]  ret_from_fork+0x2d/0x50
[ 7203.736330]  ? __pfx_io_wq_worker+0x10/0x10
[ 7203.740514]  ret_from_fork_asm+0x1a/0x30
[ 7203.744441]  </TASK>
[ 7203.746634] Modules linked in: ext4 mbcache jbd2 raid10 raid1 raid0
dm_raid raid456 async_raid6_recov async_memcpy async_pq async_xor xor
async_tx raid6_pq loop nf_tables nfnetlink tls rpcsec_gss_krb5
auth_rpcgss nfsv4 dns_resolver nfs lockd grace netfs rfkill sunrpc
vfat fat dm_multipath intel_rapl_msr intel_rapl_common
intel_uncore_frequency intel_uncore_frequency_common i10nm_edac nfit
libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel
ipmi_ssif kvm mgag200 dax_hmem iTCO_wdt i2c_algo_bit rapl
iTCO_vendor_support cxl_acpi drm_shmem_helper intel_cstate cxl_core
drm_kms_helper acpi_power_meter mei_me dcdbas dell_smbios i2c_i801
intel_uncore einj isst_if_mmio isst_if_mbox_pci ipmi_si
dell_wmi_descriptor wmi_bmof pcspkr mei i2c_smbus isst_if_common
acpi_ipmi intel_vsec intel_pch_thermal ipmi_devintf ipmi_msghandler
drm fuse xfs libcrc32c sd_mod t10_pi sg ahci libahci crct10dif_pclmul
crc32_pclmul crc32c_intel libata tg3 ghash_clmulni_intel wmi dm_mirror
dm_region_hash dm_log dm_mod
[ 7203.746668]  [last unloaded: null_blk]
[ 7203.838416] CR2: 0000000000000028
[ 7203.841734] ---[ end trace 0000000000000000 ]---
[ 7203.919227] RIP: 0010:ublk_ctrl_start_recovery.constprop.0+0x82/0x180
[ 7203.925673] Code: ff 44 89 f3 41 0f af 5d 10 49 03 5d 08 48 8b 7b
10 48 85 ff 74 06 f6 47 2c 04 75 02 0f 0b 31 d2 4c 8d 47 28 89 e8 66
89 53 38 <f0> 0f c1 47 28 83 f8 01 0f 84 b5 00 00 00 85 c0 0f 8e b7 00
00 00
[ 7203.944417] RSP: 0018:ff59ae67453ffce0 EFLAGS: 00010246
[ 7203.949646] RAX: 00000000ffffffff RBX: ff2fabb3b5682000 RCX: 0000000000000000
[ 7203.956778] RDX: 0000000000000000 RSI: ffffffffa324ee00 RDI: 0000000000000000
[ 7203.963909] RBP: 00000000ffffffff R08: 0000000000000028 R09: ffffffffa36e33e0
[ 7203.971042] R10: 0000000000000000 R11: 0000000000000000 R12: ff2fabb3ae44a468
[ 7203.978174] R13: ff2fabb3ae44a000 R14: 0000000000000000 R15: ff2fabb3ce150080
[ 7203.985307] FS:  00007fbed107c740(0000) GS:ff2fabb5af700000(0000)
knlGS:0000000000000000
[ 7203.993395] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7203.999139] CR2: 0000000000000028 CR3: 000000011baa0004 CR4: 0000000000771ef0
[ 7204.006274] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 7204.013405] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 7204.020537] PKRU: 55555554
[ 7204.023250] Kernel panic - not syncing: Fatal exception
[ 7204.028542] Kernel Offset: 0x20a00000 from 0xffffffff81000000
(relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 7204.110552] ---[ end Kernel panic - not syncing: Fatal exception ]---

--
Best Regards,
     Changhui






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