On 2/27/24 14:50, Mirsad Todorovac wrote:
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
Yes, you are right. There is a memory leak under certain condition. Will post a patch to fix it.
Thanks, Longman
# 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)