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id 006d021491bc7-67b9bd49644mr4828247eaf.63.1772973066145; Sun, 08 Mar 2026 05:31:06 -0700 (PDT) Date: Sun, 08 Mar 2026 05:31:06 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ad6c0a.a00a0220.b130.0000.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 __pcs_replace_full_main BUG: memory leak unreferenced object 0xffff888101d79200 (size 512): comm "kworker/u8:5", pid 182, jiffies 4294937433 hex dump (first 32 bytes): e0 22 eb 30 81 88 ff ff b0 b7 ad 81 ff ff ff ff .".0............ 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc 3ee28017): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4547 [inline] slab_alloc_node mm/slub.c:4869 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2771 alloc_empty_sheaf mm/slub.c:2786 [inline] __pcs_replace_full_main+0xe8/0x300 mm/slub.c:5725 free_to_pcs mm/slub.c:5778 [inline] slab_free mm/slub.c:6173 [inline] kfree+0x352/0x390 mm/slub.c:6486 call_usermodehelper_freeinfo kernel/umh.c:43 [inline] umh_complete kernel/umh.c:57 [inline] call_usermodehelper_exec_async+0x1c7/0x1f0 kernel/umh.c:119 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 0xffff888101fa6c00 (size 512): comm "kworker/1:1", pid 41, jiffies 4294937441 hex dump (first 32 bytes): b0 1e fc 11 81 88 ff ff b0 b7 ad 81 ff ff ff ff ................ 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc a295f059): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4547 [inline] slab_alloc_node mm/slub.c:4869 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2771 alloc_empty_sheaf mm/slub.c:2786 [inline] __pcs_replace_full_main+0xe8/0x300 mm/slub.c:5725 free_to_pcs mm/slub.c:5778 [inline] slab_free mm/slub.c:6173 [inline] kfree+0x352/0x390 mm/slub.c:6486 vfree.part.0+0x1d5/0x4d0 mm/vmalloc.c:3485 vfree mm/vmalloc.c:3456 [inline] delayed_vfree_work+0x5b/0x90 mm/vmalloc.c:3398 process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275 process_scheduled_works kernel/workqueue.c:3358 [inline] worker_thread+0x243/0x490 kernel/workqueue.c:3439 kthread+0x14e/0x1a0 kernel/kthread.c:436 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 0xffff888109d31a00 (size 512): comm "kworker/0:1", pid 10, jiffies 4294937949 hex dump (first 32 bytes): c0 fa 74 29 81 88 ff ff b0 b7 ad 81 ff ff ff ff ..t)............ 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc e073aa0b): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4547 [inline] slab_alloc_node mm/slub.c:4869 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2771 alloc_empty_sheaf mm/slub.c:2786 [inline] __pcs_replace_full_main+0xe8/0x300 mm/slub.c:5725 free_to_pcs mm/slub.c:5778 [inline] slab_free mm/slub.c:6173 [inline] kfree+0x352/0x390 mm/slub.c:6486 vfree.part.0+0x1d5/0x4d0 mm/vmalloc.c:3485 vfree mm/vmalloc.c:3456 [inline] delayed_vfree_work+0x5b/0x90 mm/vmalloc.c:3398 process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275 process_scheduled_works kernel/workqueue.c:3358 [inline] worker_thread+0x243/0x490 kernel/workqueue.c:3439 kthread+0x14e/0x1a0 kernel/kthread.c:436 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 0xffff888109d3d800 (size 512): comm "udevadm", pid 5179, jiffies 4294938390 hex dump (first 32 bytes): 88 43 58 27 81 88 ff ff b0 b7 ad 81 ff ff ff ff .CX'............ 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc 37e3920): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4547 [inline] slab_alloc_node mm/slub.c:4869 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2771 alloc_empty_sheaf mm/slub.c:2786 [inline] alloc_full_sheaf mm/slub.c:2834 [inline] __pcs_replace_empty_main+0x1d2/0x260 mm/slub.c:4629 alloc_from_pcs mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:4854 [inline] __kmalloc_cache_noprof+0x3ac/0x480 mm/slub.c:5378 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] kernfs_get_open_node fs/kernfs/file.c:543 [inline] kernfs_fop_open+0x4f3/0x580 fs/kernfs/file.c:718 do_dentry_open+0x202/0x8d0 fs/open.c:949 vfs_open+0x3d/0x1b0 fs/open.c:1081 do_open fs/namei.c:4671 [inline] path_openat+0x154d/0x1e20 fs/namei.c:4830 do_file_open+0x121/0x200 fs/namei.c:4859 do_sys_openat2+0xa5/0x140 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x82/0xf0 fs/open.c:1383 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 0xffff88810b5a5000 (size 512): comm "udevd", pid 5178, jiffies 4294938454 hex dump (first 32 bytes): 80 c5 8e 2b 81 88 ff ff b0 b7 ad 81 ff ff ff ff ...+............ 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc bce89c59): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4547 [inline] slab_alloc_node mm/slub.c:4869 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2771 alloc_empty_sheaf mm/slub.c:2786 [inline] alloc_full_sheaf mm/slub.c:2834 [inline] __pcs_replace_empty_main+0x1d2/0x260 mm/slub.c:4629 alloc_from_pcs mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:4854 [inline] __kmalloc_cache_noprof+0x3ac/0x480 mm/slub.c:5378 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] kernfs_get_open_node fs/kernfs/file.c:543 [inline] kernfs_fop_open+0x4f3/0x580 fs/kernfs/file.c:718 do_dentry_open+0x202/0x8d0 fs/open.c:949 vfs_open+0x3d/0x1b0 fs/open.c:1081 do_open fs/namei.c:4671 [inline] path_openat+0x154d/0x1e20 fs/namei.c:4830 do_file_open+0x121/0x200 fs/namei.c:4859 do_sys_openat2+0xa5/0x140 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x82/0xf0 fs/open.c:1383 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 0xffff888109d3ce00 (size 512): comm "udevd", pid 5189, jiffies 4294938454 hex dump (first 32 bytes): b0 4e 89 2b 81 88 ff ff b0 b7 ad 81 ff ff ff ff .N.+............ 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc e7e352bb): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4547 [inline] slab_alloc_node mm/slub.c:4869 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2771 alloc_empty_sheaf mm/slub.c:2786 [inline] alloc_full_sheaf mm/slub.c:2834 [inline] __pcs_replace_empty_main+0x1d2/0x260 mm/slub.c:4629 alloc_from_pcs mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:4854 [inline] __do_kmalloc_node mm/slub.c:5262 [inline] __kmalloc_noprof+0x4c5/0x560 mm/slub.c:5275 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] tomoyo_encode2+0xd0/0x1e0 security/tomoyo/realpath.c:45 tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0xc4/0x2c0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x12c/0x290 security/tomoyo/file.c:827 security_inode_getattr+0xaa/0x200 security/security.c:1869 vfs_getattr fs/stat.c:259 [inline] vfs_fstat+0x48/0xe0 fs/stat.c:281 __do_sys_newfstat+0x42/0xa0 fs/stat.c:551 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 connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF Tested on: commit: c23719ab Merge tag 'x86-urgent-2026-03-08' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1228e75a580000 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=1310e75a580000