On 2020/7/15 下午9:49, Chris Down wrote: > Hi Wenruo, > > While testing my pending patches on top of linux-next, I encountered a > bug that seems related to this patch during btrfs unmount. Specifically, > a null pointer dereference in kobject_del inside btrfs_sysfs_del_qgroups > from close_ctree. > > The fix may be as simple as checking if the kobject is initialised, > although perhaps it should always be initialised in this case, so I'll > leave you to work out what the real issue is :-) Thank you very much for the report. May I ask if the qgroup is enabled? Or qgroup is not enabled at all? Thanks, Qu > > > RIP: kobject_del+0x1/0x20 > > [...] > > Call Trace: > btrfs_sysfs_del_qgroups+0xa5/0xe0 > close_ctree+0x1cd/0x2c0 > generic_shutdown_super+0x6c/0x100 > kill_anon_super+0x14/0x30 > btrfs_kill_super+0x12/0x20 > deactivate_locked_super+0x36/0x90 > cleanup_mnt+0x12d/0x190 > task_work_run+0x5c/0x90 > __prepare_exit_to_usermode+0x164/0x170 > [...] > > Thanks, > > Chris
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