Re: [PATCH v6 07/13] blk-mq-debugfs: warn about possible deadlock

Hello,

kernel test robot noticed "RIP:debugfs_create_files" on:

commit: 492a1c791dd61f6b2abfc86a4a85acf5db1d0e32 ("[PATCH v6 07/13] blk-mq-debugfs: warn about possible deadlock")
url: https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/blk-wbt-factor-out-a-helper-wbt_set_lat/20251225-183443
base: https://git.kernel.org/cgit/linux/kernel/git/axboe/linux.git for-next
patch link: https://lore.kernel.org/all/[email protected]/
patch subject: [PATCH v6 07/13] blk-mq-debugfs: warn about possible deadlock

in testcase: blktests
version: blktests-x86_64-b1b99d1-1_20251223
with following parameters:

	disk: 1SSD
	test: nvme-005
	nvme_trtype: rdma



config: x86_64-rhel-9.4-func
compiler: gcc-14
test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480+ (Sapphire Rapids) with 256G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-lkp/[email protected]


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251230/[email protected]


[  162.300625][ T1400] nvme nvme2: creating 128 I/O queues.
[  162.876161][ T1400] nvme nvme2: mapped 128/0/0 default/read/poll queues.
[  162.901778][ T1400] ------------[ cut here ]------------
[  162.908519][ T1400] WARNING: block/blk-mq-debugfs.c:620 at debugfs_create_files+0xb8/0xe0, CPU#72: kworker/u898:10/1400
[  162.922316][ T1400] Modules linked in: siw ib_uverbs nvmet_rdma nvmet nvme_auth hkdf nvme_rdma nvme_fabrics rdma_cm iw_cm ib_cm ib_core loop f2fs binfmt_misc intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common intel_ifs i10nm_edac skx_edac_common nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp btrfs blake2b libblake2b xor zstd_compress kvm_intel raid6_pq kvm irqbypass dax_hmem ghash_clmulni_intel ast rapl cxl_acpi snd_pcm pmt_telemetry drm_client_lib spi_nor nvme iaa_crypto qat_4xxx intel_cstate cxl_port mei_me snd_timer pmt_discovery drm_shmem_helper pmt_class intel_sdsi mtd snd intel_qat ipmi_ssif intel_th_gth isst_if_mmio isst_if_mbox_pci i40e cxl_core idxd soundcore intel_th_pci i2c_i801 spi_intel_pci crc8 libie intel_uncore nvme_core einj intel_vsec cdc_ether acpi_power_meter mei drm_kms_helper pcspkr i2c_ismt intel_th wmi spi_intel isst_if_common libie_adminq i2c_smbus idxd_bus authenc ipmi_si acpi_ipmi ipmi_devintf ipmi_msghandler acpi_pad pinctrl_emmitsburg pfr_telemetry
[  162.922410][ T1400]  pfr_update drm fuse nfnetlink
[  163.034763][ T1400] CPU: 72 UID: 0 PID: 1400 Comm: kworker/u898:10 Tainted: G S                  6.19.0-rc1-00238-g492a1c791dd6 #1 PREEMPT(voluntary) 
[  163.050931][ T1400] Tainted: [S]=CPU_OUT_OF_SPEC
[  163.056656][ T1400] Hardware name: Intel Corporation EAGLESTREAM/EAGLESTREAM, BIOS SE5C7411.86B.8118.D04.2206151341 06/15/2022
[  163.070319][ T1400] Workqueue: nvme-reset-wq nvme_rdma_reset_ctrl_work [nvme_rdma]
[  163.079319][ T1400] RIP: 0010:debugfs_create_files+0xb8/0xe0
[  163.086849][ T1400] Code: 89 ef e8 1b 1f d0 ff 48 89 d8 48 c1 e8 03 42 80 3c 20 00 75 23 48 8b 2b 48 85 ed 75 b2 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc <0f> 0b e9 5f ff ff ff e8 9c a6 66 ff eb af 48 89 df e8 d2 a6 66 ff
[  163.109632][ T1400] RSP: 0018:ffa00000136c78c0 EFLAGS: 00010202
[  163.116916][ T1400] RAX: 0000000000000007 RBX: ffffffff845523a0 RCX: ffffffff845523a0
[  163.126203][ T1400] RDX: ff110022742fcc00 RSI: ff110020dbcfa400 RDI: 0000000000000001
[  163.135503][ T1400] RBP: ffa00000136c7958 R08: 0000000000000001 R09: fff3fc00026d8f05
[  163.144962][ T1400] R10: ffa00000136c782f R11: 00000000ffffffff R12: ff110022742fcc00
[  163.154244][ T1400] R13: ff110020dbcfa400 R14: ff110022742fcc00 R15: ff110022742fccfe
[  163.163587][ T1400] FS:  0000000000000000(0000) GS:ff11003fd9cf5000(0000) knlGS:0000000000000000
[  163.173957][ T1400] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  163.181790][ T1400] CR2: 00005577f0a48e88 CR3: 000000405ca70004 CR4: 0000000000f73ef0
[  163.191083][ T1400] PKRU: 55555554
[  163.195396][ T1400] Call Trace:
[  163.199405][ T1400]  <TASK>
[  163.203027][ T1400]  blk_mq_debugfs_register_hctx+0x17a/0x440
[  163.210760][ T1400]  ? kobject_add+0x116/0x180
[  163.216245][ T1400]  ? __pfx_blk_mq_debugfs_register_hctx+0x10/0x10
[  163.224443][ T1400]  ? __pfx_mutex_unlock+0x10/0x10
[  163.230393][ T1400]  ? blk_mq_register_hctx+0x1ea/0x420
[  163.236887][ T1400]  blk_mq_debugfs_register_hctxs+0xe6/0x160
[  163.243816][ T1400]  __blk_mq_update_nr_hw_queues+0x544/0xab0
[  163.250866][ T1400]  ? __pfx___blk_mq_update_nr_hw_queues+0x10/0x10
[  163.258381][ T1400]  ? mutex_lock+0x91/0xf0
[  163.263590][ T1400]  ? __pfx_mutex_lock+0x10/0x10
[  163.269330][ T1400]  ? blk_mq_run_hw_queues+0xe1/0x400
[  163.275597][ T1400]  blk_mq_update_nr_hw_queues+0x35/0x50
[  163.282091][ T1400]  nvme_rdma_configure_io_queues.cold+0x3ff/0x72f [nvme_rdma]
[  163.290878][ T1400]  ? __pfx_nvme_rdma_configure_io_queues+0x10/0x10 [nvme_rdma]
[  163.299714][ T1400]  ? nvme_rdma_configure_admin_queue+0x3d4/0x750 [nvme_rdma]
[  163.308274][ T1400]  nvme_rdma_setup_ctrl+0x252/0x4e0 [nvme_rdma]
[  163.315608][ T1400]  ? nvme_change_ctrl_state+0x1a1/0x2e0 [nvme_core]
[  163.323275][ T1400]  nvme_rdma_reset_ctrl_work+0xa7/0x170 [nvme_rdma]
[  163.330935][ T1400]  process_one_work+0x668/0xec0
[  163.336719][ T1400]  worker_thread+0x629/0x10a0
[  163.342203][ T1400]  ? __pfx_worker_thread+0x10/0x10
[  163.348169][ T1400]  kthread+0x39b/0x750
[  163.352977][ T1400]  ? __pfx_kthread+0x10/0x10
[  163.358344][ T1400]  ? __pfx__raw_spin_lock_irq+0x10/0x10
[  163.364774][ T1400]  ? __pfx_kthread+0x10/0x10
[  163.370133][ T1400]  ? __pfx_kthread+0x10/0x10
[  163.375530][ T1400]  ret_from_fork+0x2aa/0x490
[  163.380889][ T1400]  ? __pfx_ret_from_fork+0x10/0x10
[  163.386821][ T1400]  ? switch_fpu+0x13/0x1a0
[  163.391971][ T1400]  ? __switch_to+0x4cd/0xe70
[  163.397293][ T1400]  ? __pfx_kthread+0x10/0x10
[  163.402712][ T1400]  ret_from_fork_asm+0x1a/0x30
[  163.408231][ T1400]  </TASK>
[  163.411794][ T1400] ---[ end trace 0000000000000000 ]---
[  163.447563][ T3933] nvme nvme2: Removing ctrl: NQN "blktests-subsystem-1"
[  163.471043][ T3458] block nvme2n1: no available path - failing I/O
[  163.479008][ T3458] block nvme2n1: no available path - failing I/O
[  163.487171][ T3458] Buffer I/O error on dev nvme2n1, logical block 262142, async page read
[  164.210460][ T3990] SoftiWARP detached

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