WARNING: CPU: 45 PID: 84967 at ../block/mq-deadline.c:659 dd_exit_sched+0xce/0xe0

WARNING: CPU: 45 PID: 84967 at ../block/mq-deadline.c:659 dd_exit_sched+0xce/0xe0

[Xose Vazquez Perez]

Hi,

This warning arose in the middle of a lpfc bug.
The block/mq-deadline.c file of this SUSE kernel is synchronized with
the latest version, and perhaps the bug is relevant for upstream.

Thank you.

  ------------[ cut here ]------------
  statistics for priority 1: i 219 m 0 d 219 c 218
  WARNING: CPU: 45 PID: 84967 at ../block/mq-deadline.c:659 dd_exit_sched+0xce/0xe0
  Modules linked in: hid_generic usbhid st sr_mod cdrom lp parport_pc ppdev parport xfrm_user xfrm_algo xsk_diag tcp_diag udp_diag raw_diag inet_diag unix_diag af_packet_diag netlink_diag joydev 
binfmt_misc af_packet 8021q garp mrp stp llc bonding tls iscsi_ibft iscsi_boot_sysfs rfkill intel_rapl_msr intel_rapl_common ipmi_ssif nls_iso8859_1 nls_cp437 vfat fat intel_uncore_frequency 
intel_uncore_frequency_common nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp mgag200 i2c_algo_bit drm_shmem_helper coretemp acpi_ipmi pmt_telemetry bnxt_en kvm_intel drm_kms_helper ipmi_si 
mei_me pmt_crashlog pmt_class intel_sdsi syscopyarea sysfillrect kvm isst_if_mmio idxd isst_if_mbox_pci ipmi_devintf sysimgblt irqbypass pcspkr isst_if_common fb_sys_fops hpilo mei idxd_bus intel_vsec 
ipmi_msghandler button fuse drm ip_tables x_tables ext4 crc16 mbcache jbd2 dm_service_time sd_mod lpfc nvmet_fc crc32_pclmul crc32c_intel nvmet configfs ghash_clmulni_intel nvme_fc nvme nvme_fabrics 
xhci_pci xhci_pci_renesas xhci_hcd nvme_core aesni_intel ehci_pci ehci_hcd nvme_common t10_pi crypto_simd crc64_rocksoft_generic cryptd usbcore scsi_transport_fc crc64_rocksoft hpwdt crc64 wmi 
dm_mirror dm_region_hash dm_log sg scsi_dh_rdac scsi_dh_emc dm_multipath scsi_dh_alua dm_mod scsi_mod efivarfs [last unloaded: parport_pc]
  Supported: Yes
  CPU: 45 PID: 84967 Comm: kworker/45:1 Not tainted 5.14.21-150500.55.49-default #1 SLE15-SP5 a8d284bf25556592b1cf60fe7a08b3519f64459a
  Hardware name: HPE ProLiant DL360 Gen11/ProLiant DL360 Gen11, BIOS 2.12 12/13/2023
  Workqueue: fc_wq_0 fc_starget_delete [scsi_transport_fc]
  RIP: 0010:dd_exit_sched+0xce/0xe0
  Code: f5 5e 01 00 75 cf 44 8b 4b 3c 8b 4b 34 44 89 fe 8b 53 30 44 8b 43 38 48 c7 c7 c0 78 be 89 c6 05 be f5 5e 01 01 e8 52 d6 b8 ff <0f> 0b eb a7 0f 0b e9 7b ff ff ff 0f 1f 80 00 00 00 00 0f 1f 44 00
  RSP: 0018:ff1a4b078525fca8 EFLAGS: 00010282
  RAX: 0000000000000000 RBX: ff179d58de4b8280 RCX: 0000000000000027
  RDX: 0000000000000000 RSI: 00000000fffdffff RDI: ff179e563f562988
  RBP: ff179d58de4b8348 R08: 0000000000000000 R09: 0000000000000001
  R10: 0000000000000000 R11: ff1a4b078525fac0 R12: 00000000000000da
  R13: 00000000000000db R14: ff179d58de4b8200 R15: 0000000000000001
  FS:  0000000000000000(0000) GS:ff179e563f540000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 000055b308a6a2f0 CR3: 0000000112ad4003 CR4: 0000000000771ee0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
  PKRU: 55555554
  Call Trace:
   <TASK>
   blk_mq_exit_sched+0xf4/0x140
   elevator_exit+0x34/0x50
   del_gendisk+0x1df/0x260
   sd_remove+0x2b/0x50 [sd_mod 108a8db1998ebfa85269b3443a86c030efc2748a]
   device_release_driver_internal+0x201/0x220
   bus_remove_device+0xd8/0x150
   device_del+0x18d/0x3f0
   ? attribute_container_device_trigger+0x7d/0xe0
   __scsi_remove_device+0x102/0x140 [scsi_mod 08708485d882770c298abf1048a3cad58978296b]
   scsi_remove_device+0x21/0x30 [scsi_mod 08708485d882770c298abf1048a3cad58978296b]
   scsi_remove_target+0x18b/0x220 [scsi_mod 08708485d882770c298abf1048a3cad58978296b]
   process_one_work+0x264/0x440
   worker_thread+0x2d/0x3c0
   ? process_one_work+0x440/0x440
   kthread+0x154/0x180
   ? set_kthread_struct+0x50/0x50
   ret_from_fork+0x1f/0x30
   </TASK>
  ---[ end trace b16f99388190585f ]---

Re: WARNING: CPU: 45 PID: 84967 at ../block/mq-deadline.c:659 dd_exit_sched+0xce/0xe0

[Bart Van Assche]

On 3/8/24 07:24, Xose Vazquez Perez wrote:
> This warning arose in the middle of a lpfc bug.
> The block/mq-deadline.c file of this SUSE kernel is synchronized with
> the latest version, and perhaps the bug is relevant for upstream.
> 
>   statistics for priority 1: i 219 m 0 d 219 c 218
>   WARNING: CPU: 45 PID: 84967 at ../block/mq-deadline.c:659 
> dd_exit_sched+0xce/0xe0

I think this indicates a bug in the block layer core - a bug that has
been fixed in the latest kernels by the blk-flush.c rewrite. I fixed
this bug for the Android 6.1 kernel. Please let me know if it would help
if I make my fix available for inclusion in the stable trees.

Bart.