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AJvYcCUWffU5SX46fC7lhT9bRFAT7Vu6+vSd72f30gU0bU/gO3lqKFb6m/9e5CSu5CVXBJC9Z2bLbVar0WzsH2A9@vger.kernel.org X-Gm-Message-State: AOJu0YxJyvEBrYUAZlo6dXAsELWk1Mzuap8XpODfhu+5MsB4T/UbvOFH 1iLmjqfF8SjEh+mMSrXkGb8BRblZosj0lrYLiHGGZqFWzOmx0pqe0ddGEAychyBoid/Pi1hVefo lPuBqYPYCpLmFT/DDyv1LG3hVjLWPG7K502OYxn/3hEUMSu3x2vxwb6dzOas= Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1ca1:b0:67b:b89e:22af with SMTP id 006d021491bc7-67bb89e23dbmr2349238eaf.51.1773124146144; Mon, 09 Mar 2026 23:29:06 -0700 (PDT) Date: Mon, 09 Mar 2026 23:29:06 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69afba32.a00a0220.d013.0002.GAE@google.com> Subject: Re: [syzbot] [mm?] [f2fs?] [exfat?] memory leak in __kfree_rcu_sheaf From: syzbot To: akpm@linux-foundation.org, catalin.marinas@arm.com, chao@kernel.org, hao.li@linux.dev, harry.yoo@oracle.com, jaegeuk@kernel.org, jannh@google.com, liam.howlett@oracle.com, linkinjeon@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, pfalcato@suse.de, sj1557.seo@samsung.com, syzkaller-bugs@googlegroups.com, vbabka@kernel.org, vbabka@suse.cz, wangqing7171@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: memory leak in copy_process BUG: memory leak unreferenced object 0xffff888101799d80 (size 184): comm "kthreadd", pid 2, jiffies 4294948049 hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0a 21 00 00 00 00 00 00 58 78 fd 01 81 88 ff ff .!......Xx...... backtrace (crc e9f8bd9): kmemleak_alloc_recursive include/linux/kmemleak.h:45 [inline] slab_post_alloc_hook mm/slub.c:4552 [inline] slab_alloc_node mm/slub.c:4874 [inline] kmem_cache_alloc_noprof+0x372/0x480 mm/slub.c:4881 alloc_pid+0xe4/0x850 kernel/pid.c:189 copy_process+0x1a97/0x28c0 kernel/fork.c:2239 kernel_clone+0xac/0x6e0 kernel/fork.c:2654 kernel_thread+0x80/0xb0 kernel/fork.c:2715 create_kthread kernel/kthread.c:459 [inline] kthreadd+0x186/0x250 kernel/kthread.c:817 ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: memory leak unreferenced object 0xffff88810b0d7b40 (size 184): comm "kthreadd", pid 2, jiffies 4294948049 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc ddb1bc35): kmemleak_alloc_recursive include/linux/kmemleak.h:45 [inline] slab_post_alloc_hook mm/slub.c:4552 [inline] slab_alloc_node mm/slub.c:4874 [inline] kmem_cache_alloc_noprof+0x372/0x480 mm/slub.c:4881 prepare_creds+0x22/0x600 kernel/cred.c:185 copy_creds+0x44/0x290 kernel/cred.c:286 copy_process+0x7a7/0x28c0 kernel/fork.c:2084 kernel_clone+0xac/0x6e0 kernel/fork.c:2654 kernel_thread+0x80/0xb0 kernel/fork.c:2715 create_kthread kernel/kthread.c:459 [inline] kthreadd+0x186/0x250 kernel/kthread.c:817 ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: memory leak unreferenced object 0xffff88810b91e4a0 (size 32): comm "kthreadd", pid 2, jiffies 4294948049 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ f8 6e 0a 00 81 88 ff ff 00 00 00 00 00 00 00 00 .n.............. backtrace (crc 13ba6aa5): kmemleak_alloc_recursive include/linux/kmemleak.h:45 [inline] slab_post_alloc_hook mm/slub.c:4552 [inline] slab_alloc_node mm/slub.c:4874 [inline] __do_kmalloc_node mm/slub.c:5267 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5280 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] lsm_blob_alloc+0x4d/0x80 security/security.c:192 lsm_cred_alloc security/security.c:209 [inline] security_prepare_creds+0x2d/0x290 security/security.c:2763 prepare_creds+0x395/0x600 kernel/cred.c:215 copy_creds+0x44/0x290 kernel/cred.c:286 copy_process+0x7a7/0x28c0 kernel/fork.c:2084 kernel_clone+0xac/0x6e0 kernel/fork.c:2654 kernel_thread+0x80/0xb0 kernel/fork.c:2715 create_kthread kernel/kthread.c:459 [inline] kthreadd+0x186/0x250 kernel/kthread.c:817 ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF Tested on: commit: 1f318b96 Linux 7.0-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1224694a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2c6ad6fefffa76b1 dashboard link: https://syzkaller.appspot.com/bug?extid=cae7809e9dc1459e4e63 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=110faf5a580000