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213c5a459a
Found this issue by kmemleak: the 'sg' and 'sgc' pointers from __sdt_alloc() might be leaked as each domain holds many groups' ref, but in destroy_sched_domain(), it only declined the first group ref. Onlining and offlining a CPU can trigger this leak, and cause OOM. Reproducer for my 6 CPUs machine: while true do echo 0 > /sys/devices/system/cpu/cpu5/online; echo 1 > /sys/devices/system/cpu/cpu5/online; done unreferenced object 0xffff88007d772a80 (size 64): comm "cpuhp/5", pid 39, jiffies 4294719962 (age 35.251s) hex dump (first 32 bytes): c0 22 77 7d 00 88 ff ff 02 00 00 00 01 00 00 00 ."w}............ 40 2a 77 7d 00 88 ff ff 00 00 00 00 00 00 00 00 @*w}............ backtrace: [<ffffffff8176525a>] kmemleak_alloc+0x4a/0xa0 [<ffffffff8121efe1>] __kmalloc_node+0xf1/0x280 [<ffffffff810d94a8>] build_sched_domains+0x1e8/0xf20 [<ffffffff810da674>] partition_sched_domains+0x304/0x360 [<ffffffff81139557>] cpuset_update_active_cpus+0x17/0x40 [<ffffffff810bdb2e>] sched_cpu_activate+0xae/0xc0 [<ffffffff810900e0>] cpuhp_invoke_callback+0x90/0x400 [<ffffffff81090597>] cpuhp_up_callbacks+0x37/0xb0 [<ffffffff81090887>] cpuhp_thread_fun+0xd7/0xf0 [<ffffffff810b37e0>] smpboot_thread_fn+0x110/0x160 [<ffffffff810af5d9>] kthread+0x109/0x140 [<ffffffff81770e45>] ret_from_fork+0x25/0x30 [<ffffffffffffffff>] 0xffffffffffffffff unreferenced object 0xffff88007d772a40 (size 64): comm "cpuhp/5", pid 39, jiffies 4294719962 (age 35.251s) hex dump (first 32 bytes): 03 00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 ................ 00 04 00 00 00 00 00 00 4f 3c fc ff 00 00 00 00 ........O<...... backtrace: [<ffffffff8176525a>] kmemleak_alloc+0x4a/0xa0 [<ffffffff8121efe1>] __kmalloc_node+0xf1/0x280 [<ffffffff810da16d>] build_sched_domains+0xead/0xf20 [<ffffffff810da674>] partition_sched_domains+0x304/0x360 [<ffffffff81139557>] cpuset_update_active_cpus+0x17/0x40 [<ffffffff810bdb2e>] sched_cpu_activate+0xae/0xc0 [<ffffffff810900e0>] cpuhp_invoke_callback+0x90/0x400 [<ffffffff81090597>] cpuhp_up_callbacks+0x37/0xb0 [<ffffffff81090887>] cpuhp_thread_fun+0xd7/0xf0 [<ffffffff810b37e0>] smpboot_thread_fn+0x110/0x160 [<ffffffff810af5d9>] kthread+0x109/0x140 [<ffffffff81770e45>] ret_from_fork+0x25/0x30 [<ffffffffffffffff>] 0xffffffffffffffff Reported-by: Chunyu Hu <chuhu@redhat.com> Signed-off-by: Shu Wang <shuwang@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Chunyu Hu <chuhu@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: liwang@redhat.com Link: http://lkml.kernel.org/r/1502351536-9108-1-git-send-email-shuwang@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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README |
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.