linux-kernel - [BUG] selftests: cgroup: KMEMLEAK in cgroup/test_cpuset

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Date: Tue, 27 Feb 2024 20:50:54 +0100
From: Mirsad Todorovac <mirsad.todorovac@....hr>
To: linux-kernel@...r.kernel.org
Cc: Waiman Long <longman@...hat.com>, Zefan Li <lizefan.x@...edance.com>,
 Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
 Shuah Khan <shuah@...nel.org>, cgroups@...r.kernel.org,
 linux-kselftest@...r.kernel.org, cgroups@...r.kernel.org,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
 linux-fsdevel@...r.kernel.org
Subject: [BUG] selftests: cgroup: KMEMLEAK in cgroup/test_cpuset_prs.sh

Hi, everybody,

In the latest vanilla torvalds tree kernel v6.8-rc6-11-g45ec2f5f6ed3 on an Ubuntu 23.10 system, there
KMEMLEAK detected a couple of memory leaks:

Visually it appears like the same leak repeated six times, but I reckoned it might be of importance to
review them all.

It happened on two boxes, and both have AMD Ryzen processors 7 and 9.

Please find attached the build .config

Best regards,
Mirsad Todorovac

# cat /sys/kernel/debug/kmemleak [stack decoded]
unreferenced object 0xffff8d49bd92a720 (size 8):
comm "test_cpuset_prs", pid 9213, jiffies 4294953562
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
kmemleak_alloc (/home/marvin/linux/kernel/linux_torvalds/mm/kmemleak.c:1045)
__kmalloc_node (/home/marvin/linux/kernel/linux_torvalds/./include/linux/kmemleak.h:42 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3817 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3860 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3980 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3988)
alloc_cpumask_var_node (/home/marvin/linux/kernel/linux_torvalds/lib/cpumask.c:71)
cpuset_write_resmask (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:643 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:2601 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:3630)
cgroup_file_write (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cgroup.c:4092)
kernfs_fop_write_iter (/home/marvin/linux/kernel/linux_torvalds/fs/kernfs/file.c:334)
vfs_write (/home/marvin/linux/kernel/linux_torvalds/./include/linux/fs.h:2087 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:497 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:590)
ksys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:643)
__x64_sys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:652)
do_syscall_64 (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:52 /home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:129)
unreferenced object 0xffff8d49bd92a488 (size 8):
comm "test_cpuset_prs", pid 9213, jiffies 4294953562
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
kmemleak_alloc (/home/marvin/linux/kernel/linux_torvalds/mm/kmemleak.c:1045)
__kmalloc_node (/home/marvin/linux/kernel/linux_torvalds/./include/linux/kmemleak.h:42 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3817 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3860 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3980 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3988)
alloc_cpumask_var_node (/home/marvin/linux/kernel/linux_torvalds/lib/cpumask.c:71)
cpuset_write_resmask (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:646 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:2601 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:3630)
cgroup_file_write (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cgroup.c:4092)
kernfs_fop_write_iter (/home/marvin/linux/kernel/linux_torvalds/fs/kernfs/file.c:334)
vfs_write (/home/marvin/linux/kernel/linux_torvalds/./include/linux/fs.h:2087 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:497 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:590)
ksys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:643)
__x64_sys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:652)
do_syscall_64 (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:52 /home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:129)
unreferenced object 0xffff8d49bd92a890 (size 8):
comm "test_cpuset_prs", pid 9213, jiffies 4294953562
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
kmemleak_alloc (/home/marvin/linux/kernel/linux_torvalds/mm/kmemleak.c:1045)
__kmalloc_node (/home/marvin/linux/kernel/linux_torvalds/./include/linux/kmemleak.h:42 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3817 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3860 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3980 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3988)
alloc_cpumask_var_node (/home/marvin/linux/kernel/linux_torvalds/lib/cpumask.c:71)
cpuset_write_resmask (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:649 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:2601 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:3630)
cgroup_file_write (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cgroup.c:4092)
kernfs_fop_write_iter (/home/marvin/linux/kernel/linux_torvalds/fs/kernfs/file.c:334)
vfs_write (/home/marvin/linux/kernel/linux_torvalds/./include/linux/fs.h:2087 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:497 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:590)
ksys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:643)
__x64_sys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:652)
do_syscall_64 (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:52 /home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:129)
unreferenced object 0xffff8d48c12f3720 (size 8):
comm "test_cpuset_prs", pid 28081, jiffies 4295018483
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
kmemleak_alloc (/home/marvin/linux/kernel/linux_torvalds/mm/kmemleak.c:1045)
__kmalloc_node (/home/marvin/linux/kernel/linux_torvalds/./include/linux/kmemleak.h:42 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3817 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3860 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3980 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3988)
alloc_cpumask_var_node (/home/marvin/linux/kernel/linux_torvalds/lib/cpumask.c:71)
cpuset_write_resmask (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:643 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:2601 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:3630)
cgroup_file_write (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cgroup.c:4092)
kernfs_fop_write_iter (/home/marvin/linux/kernel/linux_torvalds/fs/kernfs/file.c:334)
vfs_write (/home/marvin/linux/kernel/linux_torvalds/./include/linux/fs.h:2087 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:497 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:590)
ksys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:643)
__x64_sys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:652)
do_syscall_64 (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:52 /home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:129)
unreferenced object 0xffff8d48c12f3180 (size 8):
comm "test_cpuset_prs", pid 28081, jiffies 4295018483
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
kmemleak_alloc (/home/marvin/linux/kernel/linux_torvalds/mm/kmemleak.c:1045)
__kmalloc_node (/home/marvin/linux/kernel/linux_torvalds/./include/linux/kmemleak.h:42 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3817 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3860 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3980 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3988)
alloc_cpumask_var_node (/home/marvin/linux/kernel/linux_torvalds/lib/cpumask.c:71)
cpuset_write_resmask (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:646 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:2601 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:3630)
cgroup_file_write (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cgroup.c:4092)
kernfs_fop_write_iter (/home/marvin/linux/kernel/linux_torvalds/fs/kernfs/file.c:334)
vfs_write (/home/marvin/linux/kernel/linux_torvalds/./include/linux/fs.h:2087 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:497 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:590)
ksys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:643)
__x64_sys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:652)
do_syscall_64 (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:52 /home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:129)
unreferenced object 0xffff8d48c12f3188 (size 8):
comm "test_cpuset_prs", pid 28081, jiffies 4295018483
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
kmemleak_alloc (/home/marvin/linux/kernel/linux_torvalds/mm/kmemleak.c:1045)
__kmalloc_node (/home/marvin/linux/kernel/linux_torvalds/./include/linux/kmemleak.h:42 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3817 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3860 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3980 /home/marvin/linux/kernel/linux_torvalds/mm/slub.c:3988)
alloc_cpumask_var_node (/home/marvin/linux/kernel/linux_torvalds/lib/cpumask.c:71)
cpuset_write_resmask (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:649 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:2601 /home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cpuset.c:3630)
cgroup_file_write (/home/marvin/linux/kernel/linux_torvalds/kernel/cgroup/cgroup.c:4092)
kernfs_fop_write_iter (/home/marvin/linux/kernel/linux_torvalds/fs/kernfs/file.c:334)
vfs_write (/home/marvin/linux/kernel/linux_torvalds/./include/linux/fs.h:2087 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:497 /home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:590)
ksys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:643)
__x64_sys_write (/home/marvin/linux/kernel/linux_torvalds/fs/read_write.c:652)
do_syscall_64 (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:52 /home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:129)




-- 
CARNet system engineer
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University of Zagreb

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