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id 006d021491bc7-67c22ec467emr1960545eaf.25.1774002842204; Fri, 20 Mar 2026 03:34:02 -0700 (PDT) Date: Fri, 20 Mar 2026 03:34:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bd229a.050a0220.3bf4de.001c.GAE@google.com> Subject: Re: [syzbot] [mm?] [f2fs?] [exfat?] memory leak in __kfree_rcu_sheaf From: syzbot To: akpm@linux-foundation.org, chao@kernel.org, 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@suse.cz 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_empty_main BUG: memory leak unreferenced object 0xffff88810005f800 (size 512): comm "swapper/0", pid 0, jiffies 4294937296 hex dump (first 32 bytes): 60 bd 2a 2f 81 88 ff ff 30 ba 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 81834c79): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4543 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2764 alloc_empty_sheaf mm/slub.c:2779 [inline] alloc_full_sheaf mm/slub.c:2829 [inline] __pcs_replace_empty_main+0x1e0/0x2f0 mm/slub.c:4626 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] __kmalloc_cache_noprof+0x3ac/0x480 mm/slub.c:5375 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __irq_domain_alloc_fwnode+0x37/0x140 kernel/irq/irqdomain.c:95 irq_domain_alloc_named_fwnode include/linux/irqdomain.h:271 [inline] arch_early_irq_init+0x1c/0x70 arch/x86/kernel/apic/vector.c:803 start_kernel+0x931/0xb80 init/main.c:1114 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0xce/0xd0 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x148 BUG: memory leak unreferenced object 0xffff8881008f6c00 (size 512): comm "kthreadd", pid 2, jiffies 4294937342 hex dump (first 32 bytes): d0 16 c9 29 81 88 ff ff 30 ba 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 38b48d73): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4543 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2764 alloc_empty_sheaf mm/slub.c:2779 [inline] alloc_full_sheaf mm/slub.c:2829 [inline] __pcs_replace_empty_main+0x1e0/0x2f0 mm/slub.c:4626 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] __kmalloc_cache_node_noprof+0x3ef/0x4e0 mm/slub.c:5388 kmalloc_node_noprof include/linux/slab.h:1077 [inline] __get_vm_area_node+0xc6/0x1d0 mm/vmalloc.c:3221 __vmalloc_node_range_noprof+0x1d3/0xe50 mm/vmalloc.c:4024 __vmalloc_node_noprof+0x71/0x90 mm/vmalloc.c:4124 alloc_thread_stack_node kernel/fork.c:355 [inline] dup_task_struct kernel/fork.c:924 [inline] copy_process+0x3e5/0x28c0 kernel/fork.c:2050 kernel_clone+0xac/0x6e0 kernel/fork.c:2653 kernel_thread+0x80/0xb0 kernel/fork.c:2714 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 0xffff888102011400 (size 512): comm "kworker/u8:1", pid 274, jiffies 4294937433 hex dump (first 32 bytes): 28 f6 7b 31 81 88 ff ff 30 ba ad 81 ff ff ff ff (.{1....0....... 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc c5ce2dfb): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4543 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2764 alloc_empty_sheaf mm/slub.c:2779 [inline] __pcs_replace_full_main+0xe8/0x300 mm/slub.c:5722 free_to_pcs mm/slub.c:5775 [inline] slab_free mm/slub.c:6170 [inline] kfree+0x352/0x390 mm/slub.c:6483 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 0xffff888102010600 (size 512): comm "kworker/1:1", pid 41, jiffies 4294937437 hex dump (first 32 bytes): 88 c3 c4 29 81 88 ff ff 30 ba 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 5d48f1c0): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4543 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2764 alloc_empty_sheaf mm/slub.c:2779 [inline] __pcs_replace_full_main+0xe8/0x300 mm/slub.c:5722 free_to_pcs mm/slub.c:5775 [inline] slab_free mm/slub.c:6170 [inline] kfree+0x352/0x390 mm/slub.c:6483 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+0x277/0x5f0 kernel/workqueue.c:3276 process_scheduled_works kernel/workqueue.c:3359 [inline] worker_thread+0x255/0x4a0 kernel/workqueue.c:3440 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 0xffff888102010400 (size 512): comm "kworker/u8:1", pid 443, jiffies 4294937439 hex dump (first 32 bytes): e8 50 dd 31 81 88 ff ff 30 ba ad 81 ff ff ff ff .P.1....0....... 00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00 ........<....... backtrace (crc 11032afc): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4543 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2764 alloc_empty_sheaf mm/slub.c:2779 [inline] __pcs_replace_full_main+0xe8/0x300 mm/slub.c:5722 free_to_pcs mm/slub.c:5775 [inline] slab_free mm/slub.c:6170 [inline] kfree+0x352/0x390 mm/slub.c:6483 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 0xffff8881095d5a00 (size 256): comm "swapper/0", pid 1, jiffies 4294937857 hex dump (first 32 bytes): 00 d4 9c 1d 81 88 ff ff 88 fc 04 00 81 88 ff ff ................ 00 1a 04 00 81 88 ff ff 1c 00 00 00 00 00 00 00 ................ backtrace (crc deebd371): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4543 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2764 alloc_empty_sheaf mm/slub.c:2779 [inline] alloc_full_sheaf mm/slub.c:2829 [inline] __pcs_replace_empty_main+0x1e0/0x2f0 mm/slub.c:4626 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] __kmalloc_cache_noprof+0x3ac/0x480 mm/slub.c:5375 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] init_srcu_struct_fields+0x29d/0x320 kernel/rcu/srcutree.c:241 rtnl_link_register+0x81/0x1c0 net/core/rtnetlink.c:615 ipgre_init+0x10d/0x1a0 net/ipv4/ip_gre.c:1828 do_one_initcall+0x79/0x4c0 init/main.c:1382 do_initcall_level init/main.c:1444 [inline] do_initcalls init/main.c:1460 [inline] do_basic_setup init/main.c:1479 [inline] kernel_init_freeable+0x2a4/0x340 init/main.c:1692 kernel_init+0x1b/0x1d0 init/main.c:1582 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: 0e4f8f1a Merge tag 'parisc-for-7.0-rc5' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13b18cba580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e2bba615ee79faa5 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=12608cba580000