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006d021491bc7-67b9bca8899mr9412099eaf.18.1773135603949; Tue, 10 Mar 2026 02:40:03 -0700 (PDT) Date: Tue, 10 Mar 2026 02:40:03 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69afe6f3.050a0220.310d8.0038.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 __kthread_create_on_node BUG: memory leak unreferenced object 0xffff88811351d1b0 (size 16): comm "syz.0.38", pid 7021, jiffies 4294948268 hex dump (first 16 bytes): 66 32 66 73 5f 66 6c 75 73 68 2d 37 3a 30 00 00 f2fs_flush-7:0.. backtrace (crc 73f9c04e): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4548 [inline] slab_alloc_node mm/slub.c:4870 [inline] __do_kmalloc_node mm/slub.c:5263 [inline] __kmalloc_node_track_caller_noprof+0x3e0/0x5d0 mm/slub.c:5372 kvasprintf+0x6e/0xf0 lib/kasprintf.c:25 __kthread_create_on_node+0x9e/0x1c0 kernel/kthread.c:491 kthread_create_on_node+0x73/0xa0 kernel/kthread.c:559 f2fs_create_flush_cmd_control+0x178/0x200 fs/f2fs/segment.c:707 f2fs_build_segment_manager+0x212/0x3630 fs/f2fs/segment.c:5734 f2fs_fill_super+0x14b1/0x3c20 fs/f2fs/super.c:5140 get_tree_bdev_flags+0x1c0/0x290 fs/super.c:1694 vfs_get_tree+0x30/0x120 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount fs/namespace.c:3839 [inline] path_mount+0x5a9/0x1360 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount fs/namespace.c:4338 [inline] __x64_sys_mount+0x1a3/0x1e0 fs/namespace.c:4338 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff88810b6a4700 (size 4544): comm "kthreadd", pid 2, jiffies 4294948268 hex dump (first 32 bytes): 04 00 08 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 01 00 00 00 80 00 00 00 00 00 00 00 ................ backtrace (crc 71339aaa): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4548 [inline] slab_alloc_node mm/slub.c:4870 [inline] kmem_cache_alloc_node_noprof+0x373/0x4d0 mm/slub.c:4922 alloc_task_struct_node kernel/fork.c:185 [inline] dup_task_struct kernel/fork.c:916 [inline] copy_process+0x286/0x28c0 kernel/fork.c:2050 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 0xffff888109f45f00 (size 184): comm "kthreadd", pid 2, jiffies 4294948268 hex dump (first 32 bytes): 02 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 5ee6cb00): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4548 [inline] slab_alloc_node mm/slub.c:4870 [inline] kmem_cache_alloc_noprof+0x372/0x480 mm/slub.c:4877 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 0xffff8881096f8240 (size 32): comm "kthreadd", pid 2, jiffies 4294948268 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:44 [inline] slab_post_alloc_hook mm/slub.c:4548 [inline] slab_alloc_node mm/slub.c:4870 [inline] __do_kmalloc_node mm/slub.c:5263 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5276 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 BUG: memory leak unreferenced object 0xffff888125626e40 (size 192): comm "kthreadd", pid 2, jiffies 4294948268 hex dump (first 32 bytes): 02 00 00 00 00 00 00 00 00 00 00 00 ff ff ff ff ................ 01 00 00 00 00 00 00 00 60 4a 8a 82 ff ff ff ff ........`J...... backtrace (crc 3a1ec858): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4548 [inline] slab_alloc_node mm/slub.c:4870 [inline] __kmalloc_cache_noprof+0x377/0x480 mm/slub.c:5379 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] set_kthread_struct+0x58/0x150 kernel/kthread.c:107 copy_process+0x15b8/0x28c0 kernel/fork.c:2152 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 0xffff88812cb53700 (size 64): comm "kthreadd", pid 2, jiffies 4294948268 hex dump (first 32 bytes): 20 09 d5 89 ff ff ff ff 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 e7a33bad): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4548 [inline] slab_alloc_node mm/slub.c:4870 [inline] __do_kmalloc_node mm/slub.c:5263 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5276 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_task_alloc security/security.c:244 [inline] security_task_alloc+0x2a/0x260 security/security.c:2682 copy_process+0xedf/0x28c0 kernel/fork.c:2205 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 0xffff88810b507180 (size 1152): comm "kthreadd", pid 2, jiffies 4294948268 hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 90 71 50 0b 81 88 ff ff 90 71 50 0b 81 88 ff ff .qP......qP..... backtrace (crc ef1916d7): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4548 [inline] slab_alloc_node mm/slub.c:4870 [inline] kmem_cache_alloc_noprof+0x372/0x480 mm/slub.c:4877 copy_signal kernel/fork.c:1700 [inline] copy_process+0x10da/0x28c0 kernel/fork.c:2220 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=1751f8d6580000 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=10def8d6580000