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0d32b3ec5f
- During CPU offline, the active mask drops the CPU before cpuset updates the effective CPUs, so a task placement in that window could find no active CPU in the top cpuset and dereference NULL. Restore the NULL check. - The cpuset v2-mode test read the subsystem's root pointer, which is stale during a cgroup filesystem rebind, and the hotplug handler evaluated it before taking the cpuset mutex. Record the mode in a flag and test it under the mutex. -----BEGIN PGP SIGNATURE----- iIQEABYKACwWIQTfIjM1kS57o3GsC/uxYfJx3gVYGQUCasUtqA4cdGpAa2VybmVs Lm9yZwAKCRCxYfJx3gVYGf+HAP9wEWWAp5XQUuDFaWg6Ft8iPw4Tm+b1d2w4c5il j+EGQgD/ce2FLEIu2642xuvQB4XaScJMT7G+3XZplgBsT4/jrA4= =Qa2B -----END PGP SIGNATURE----- Merge tag 'cgroup-for-7.3-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup Pull cgroup fixes from Tejun Heo: - During CPU offline, the active mask drops the CPU before cpuset updates the effective CPUs, so a task placement in that window could find no active CPU in the top cpuset and dereference NULL. Restore the NULL check. - The cpuset v2-mode test read the subsystem's root pointer, which is stale during a cgroup filesystem rebind, and the hotplug handler evaluated it before taking the cpuset mutex. Record the mode in a flag and test it under the mutex. * tag 'cgroup-for-7.3-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup/cpuset: Call is_in_v2_mode() after acquiring cpuset_mutex in cpuset_handle_hotplug() cgroup/cpuset: Handle cpu hotplug race in guarantee_active_cpus() cgroup/cpuset: Don't access cpuset_cgrp_subsys.root in is_in_v2_mode() |
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| .. | ||
| cgroup-internal.h | ||
| cgroup-v1.c | ||
| cgroup.c | ||
| cpuset-internal.h | ||
| cpuset-v1.c | ||
| cpuset.c | ||
| debug.c | ||
| dmem.c | ||
| freezer.c | ||
| legacy_freezer.c | ||
| Makefile | ||
| misc.c | ||
| namespace.c | ||
| pids.c | ||
| rdma.c | ||
| rstat.c | ||