It has been a while since I last saw a kernel backtrace 😊

Never seen this before. I assume that this happens during pool deletion or disconnect?

Cheers,

Johann

We had an oops occur today, backtrace is below.   When I started looking, I see there are 6 of these over the last month, the backtrace is always the same.   It seems to be happening in DAX.  Does this look familiar?

Thanks, Kevan

# cat backtrace

WARNING: CPU: 18 PID: 43720 at fs/dax.c:419 dax_disassociate_entry+0xdb/0x130

Modules linked in: ext4 mbcache jbd2 vfio_pci virtio_pci virtio_ring virtio nfsv3 nfs_acl socwatch2_11(OE) vtsspp(OE) sep5(OE) socperf3(OE) pax(OE) rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache rdma_ucm(OE) ib_ucm(OE) rdma_cm(OE) iw_cm(OE) ib_ipoib(OE) ib_cm(OE) ib_umad(OE) mlx5_fpga_tools(OE) mlx5_ib(OE) ib_uverbs(OE) mlx4_ib(OE) ib_core(OE) mlx4_en(OE) mlx4_core(OE) sunrpc iTCO_wdt iTCO_vendor_support skx_edac intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm vfat fat irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd pcspkr joydev mei_me mei lpc_ich i2c_i801 wmi ipmi_si ipmi_devintf ipmi_msghandler dax_pmem device_dax acpi_power_meter acpi_pad knem(OE) ip_tables xfs libcrc32c nd_pmem nd_btt ast i2c_algo_bit

drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm ahci crct10dif_pclmul mlx5_core(OE) crct10dif_common crc32c_intel drm libahci mlxfw(OE) ptp pps_core libata vfio_mdev(OE) vfio_iommu_type1 vfio nvme mdev(OE) devlink nvme_core mlx_compat(OE) drm_panel_orientation_quirks nfit libnvdimm dm_mirror dm_region_hash dm_log dm_mod

CPU: 18 PID: 43720 Comm: daos_sys_0 Tainted: G           OE  ------------ T 3.10.0-1127.el7.x86_64 #1

Hardware name: Cray Inc. SYS-2029UZ-TN20R25M/X11DPU-Z+, BIOS 3.2 10/22/2019

Call Trace:

[<ffffffffb5b7ff85>] dump_stack+0x19/0x1b

[<ffffffffb549bd18>] __warn+0xd8/0x100

[<ffffffffb549be5d>] warn_slowpath_null+0x1d/0x20

[<ffffffffb56a6d0b>] dax_disassociate_entry+0xdb/0x130

[<ffffffffb56a7868>] __dax_invalidate_mapping_entry+0x68/0x120

[<ffffffffb56a9f47>] dax_delete_mapping_entry+0x17/0x50

[<ffffffffb55ce2fc>] truncate_exceptional_entry.part.13+0x1c/0x40

[<ffffffffb55ceaa2>] truncate_inode_pages_range+0x192/0x750

[<ffffffffb55cf0cf>] truncate_inode_pages_final+0x4f/0x60

[<ffffffffc0eeea0f>] ext4_evict_inode+0x10f/0x470 [ext4]

[<ffffffffb566b674>] evict+0xb4/0x180

[<ffffffffb566ba9c>] iput+0xfc/0x190

[<ffffffffb5666438>] __dentry_kill+0x158/0x1d0

[<ffffffffb5666ad5>] dput+0xb5/0x1a0

[<ffffffffb564f4dd>] __fput+0x18d/0x230

[<ffffffffb564f66e>] ____fput+0xe/0x10

[<ffffffffb54c31cb>] task_work_run+0xbb/0xe0

[<ffffffffb542cc65>] do_notify_resume+0xa5/0xc0

[<ffffffffb5b9322f>] int_signal+0x12/0x17

[root@delphi-002 oops-2020-05-05-11:59:34-44218-0]#