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Unlike other cgroup subsystems, the hugetlb cgroup does not provide a static array of cftype that explicitly displays the properties, handling functions, etc., of each file. Instead, it dynamically creates the attribute of cftypes based on the hstate during the startup procedure. This reduces the readability of the code. To fix this issue, introduce two templates of cftypes, and rebuild the attributes according to the hstate to make it ready to be added to cgroup framework. Link: https://lkml.kernel.org/r/20240612092409.2027592-3-xiujianfeng@huawei.com Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com> Cc: Muchun Song <muchun.song@linux.dev> Cc: Oscar Salvador <osalvador@suse.de> Cc: kernel test robot <oliver.sang@intel.com> From: Xiu Jianfeng <xiujianfeng@huawei.com> Subject: mm/hugetlb_cgroup: register lockdep key for cftype Date: Tue, 18 Jun 2024 07:19:22 +0000 When CONFIG_DEBUG_LOCK_ALLOC is enabled, the following commands can trigger a bug, mount -t cgroup2 none /sys/fs/cgroup cd /sys/fs/cgroup echo "+hugetlb" > cgroup.subtree_control The log is as below: BUG: key ffff8880046d88d8 has not been registered! ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 3 PID: 226 at kernel/locking/lockdep.c:4945 lockdep_init_map_type+0x185/0x220 Modules linked in: CPU: 3 PID: 226 Comm: bash Not tainted 6.10.0-rc4-next-20240617-g76db4c64526c #544 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:lockdep_init_map_type+0x185/0x220 Code: 00 85 c0 0f 84 6c ff ff ff 8b 3d 6a d1 85 01 85 ff 0f 85 5e ff ff ff 48 c7 c6 21 99 4a 82 48 c7 c7 60 29 49 82 e8 3b 2e f5 RSP: 0018:ffffc9000083fc30 EFLAGS: 00000282 RAX: 0000000000000000 RBX: ffffffff828dd820 RCX: 0000000000000027 RDX: ffff88803cd9cac8 RSI: 0000000000000001 RDI: ffff88803cd9cac0 RBP: ffff88800674fbb0 R08: ffffffff828ce248 R09: 00000000ffffefff R10: ffffffff8285e260 R11: ffffffff828b8eb8 R12: ffff8880046d88d8 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880067281c0 FS: 00007f68601ea740(0000) GS:ffff88803cd80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005614f3ebc740 CR3: 000000000773a000 CR4: 00000000000006f0 Call Trace: <TASK> ? __warn+0x77/0xd0 ? lockdep_init_map_type+0x185/0x220 ? report_bug+0x189/0x1a0 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x18/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? lockdep_init_map_type+0x185/0x220 __kernfs_create_file+0x79/0x100 cgroup_addrm_files+0x163/0x380 ? find_held_lock+0x2b/0x80 ? find_held_lock+0x2b/0x80 ? find_held_lock+0x2b/0x80 css_populate_dir+0x73/0x180 cgroup_apply_control_enable+0x12f/0x3a0 cgroup_subtree_control_write+0x30b/0x440 kernfs_fop_write_iter+0x13a/0x1f0 vfs_write+0x341/0x450 ksys_write+0x64/0xe0 do_syscall_64+0x4b/0x110 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f68602d9833 Code: 8b 15 61 26 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 08 RSP: 002b:00007fff9bbdf8e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f68602d9833 RDX: 0000000000000009 RSI: 00005614f3ebc740 RDI: 0000000000000001 RBP: 00005614f3ebc740 R08: 000000000000000a R09: 0000000000000008 R10: 00005614f3db6ba0 R11: 0000000000000246 R12: 0000000000000009 R13: 00007f68603bd6a0 R14: 0000000000000009 R15: 00007f68603b8880 For lockdep, there is a sanity check in lockdep_init_map_type(), the lock-class key must either have been allocated statically or must have been registered as a dynamic key. However the commit e18df2889ff9 ("mm/hugetlb_cgroup: prepare cftypes based on template") has changed the cftypes from static allocated objects to dynamic allocated objects, so the cft->lockdep_key must be registered proactively. [xiujianfeng@huawei.com: fix BUG()] Link: https://lkml.kernel.org/r/20240619015527.2212698-1-xiujianfeng@huawei.com Link: https://lkml.kernel.org/r/20240618071922.2127289-1-xiujianfeng@huawei.com Link: https://lore.kernel.org/all/602186b3-5ce3-41b3-90a3-134792cc2a48@samsung.com/ Fixes: e18df2889ff9 ("mm/hugetlb_cgroup: prepare cftypes based on template") Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com> Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202406181046.8d8b2492-oliver.sang@intel.com Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: SeongJae Park <sj@kernel.org> Closes: https://lore.kernel.org/20240618233608.400367-1-sj@kernel.org Cc: Muchun Song <muchun.song@linux.dev> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.