Hi Christoph, Recently when I use kernel5.15 with android, an issue related to bow_target is found with below log: [ 8.935429][ T1] kobject_add_internal failed for bow (error: -2 parent: (null)) The call trace to the preceding log is as below: dm_ctl_ioctl -> ctl_ioctl -> lookup_ioctl // returns the table_load function pointer table_load -> populate_table -> dm_table_add_target -> dm_bow_ctr -> kobject_init_and_add -> kobject_add_varg -> kobject_add_internal Compared to kernel5.10, then I found it’s related to below patch. The gendisk, it’s not registered yet, its kobject is not in sysfs, so its child “bow” kobject cannot be added to the kernel. commit 89f871af1b26d98d983cba7ed0e86effa45ba5f8 Author: Christoph Hellwig hch@xxxxxx Date: Wed Aug 4 11:41:46 2021 +0200 dm: delay registering the gendisk Is this an issue? if it is, is there any patch to fix it? if it is not, then what is the right way to use the bow_target in userspace? Best Regards, Zhu Faqiang. |
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