On Wed, Aug 23, 2023 at 12:06:14PM +0800, Ming Lei wrote: > > Looks the issue is more related with vfs, so forward to vfs list. > > ----- Forwarded message from Changhui Zhong <czhong@xxxxxxxxxx> ----- > > Date: Wed, 23 Aug 2023 11:17:55 +0800 > From: Changhui Zhong <czhong@xxxxxxxxxx> > To: linux-scsi@xxxxxxxxxxxxxxx > Cc: Ming Lei <ming.lei@xxxxxxxxxx> > Subject: [bug report] WARNING: CPU: 121 PID: 93233 at fs/dcache.c:365 __dentry_kill+0x214/0x278 > > Hello, > > triggered below warning issue with branch > " > Tree: mainline.kernel.org-clang > Repository: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > @ master > Commit Hash: 89bf6209cad66214d3774dac86b6bbf2aec6a30d > Commit Name: v6.5-rc7-18-g89bf6209cad6 > Kernel information: > Commit message: Merge tag 'devicetree-fixes-for-6.5-2' of > git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux > " > for more detail，please check > https://datawarehouse.cki-project.org/kcidb/tests/9232643 > > #modprobe scsi_debug virtual_gb=128 > #echo none > /sys/block/sdb/queue/scheduler > #fio --bs=4k --ioengine=libaio --iodepth=1 --numjobs=4 --rw=randrw > --name=sdb-libaio-randrw-4k --filename=/dev/sdb --direct=1 --size=60G > --runtime=60 Looking at this issue it seems unlikely that this is a vfs bug. We should see this all over the place and specifically not just on arm64. The sequence here seems to be: echo 4 > /proc/sys/vm/drop_caches rmmod scsi_debug > /dev/null 3>&1 [ 3117.059778] WARNING: CPU: 121 PID: 93233 at fs/dcache.c:365 __dentry_kill+0x214/0x278 [ 3117.067601] Modules linked in: scsi_debug nvme nvme_core nvme_common null_blk pktcdvd ipmi_watchdog ipmi_poweroff rfkill sunrpc vfat fat acpi_ipmi ipmi_ssif arm_spe_pmu igb ipmi_devintf ipmi_msghandler arm_cmn arm_dmc620_pmu cppc_cpufreq arm_dsu_pmu acpi_tad loop fuse zram xfs crct10dif_ce polyval_ce polyval_generic ghash_ce sbsa_gwdt ast onboard_usb_hub i2c_algo_bit xgene_hwmon [last unloaded: scsi_debug] So my money is on some device that gets removed still having an increased refcount and pinning the dentry. Immediate suspects would be: 7882541ca06d ("of/platform: increase refcount of fwnode") but that part is complete speculation on my part.
