----- Original Message ----- > And to follow up, I'm still running tests (and will do so overnight) on your latest > patch, but I immediately see this on any 2.6.30, 2.6.31 or 2.6.32 kernel, and on > some 2.6.36 and 2.6.38 kernels, where "runq -g" fails like this: > > crash> runq -g > runq: invalid kernel virtual address: 0 type: "dentry" > crash> The error above is pretty persistent on all kernels from 2.6.27 to 2.6.38, where you can get a legitimate cgroup that has no dentry: +static void +get_task_group_name(ulong group, char **group_name) +{ + ulong cgroup, dentry, name; + char *dentry_buf, *tmp; + int len; + + readmem(group + OFFSET(task_group_css) + OFFSET(cgroup_subsys_state_cgroup), + KVADDR, &cgroup, sizeof(ulong), + "task_group css cgroup", FAULT_ON_ERROR); + if (cgroup == 0) + return; + + readmem(cgroup + OFFSET(cgroup_dentry), KVADDR, &dentry, sizeof(ulong), + "cgroup dentry", FAULT_ON_ERROR); + + dentry_buf = GETBUF(SIZE(dentry)); + readmem(dentry, KVADDR, dentry_buf, SIZE(dentry), + "dentry", FAULT_ON_ERROR); Dave -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility