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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:162a:b0:654:faee:1065 with SMTP id 006d021491bc7-65b2ac6b25cmr3408314eaf.5.1765441802986; Thu, 11 Dec 2025 00:30:02 -0800 (PST) Date: Thu, 11 Dec 2025 00:30:02 -0800 In-Reply-To: <20251211080643.3534657-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693a810a.a70a0220.33cd7b.002c.GAE@google.com> Subject: Re: [syzbot] [ocfs2?] KASAN: use-after-free Read in ocfs2_check_dir_entry From: syzbot To: kartikey406@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: use-after-free Read in ocfs2_check_dir_entry (kworker/u8:17,5105,0):ocfs2_read_blocks_sync:112 ERROR: status = -12 (kworker/u8:17,5105,0):ocfs2_read_locked_inode:599 ERROR: status = -12 ================================================================== BUG: KASAN: use-after-free in ocfs2_check_dir_entry+0x3a0/0x480 fs/ocfs2/dir.c:318 Read of size 2 at addr ffff88805fe76780 by task kworker/u8:17/5105 CPU: 0 UID: 0 PID: 5105 Comm: kworker/u8:17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: ocfs2_wq ocfs2_complete_recovery Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 ocfs2_check_dir_entry+0x3a0/0x480 fs/ocfs2/dir.c:318 ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1826 [inline] ocfs2_dir_foreach_blk+0xfff/0x1420 fs/ocfs2/dir.c:1954 ocfs2_dir_foreach+0x42/0x70 fs/ocfs2/dir.c:1965 ocfs2_queue_orphans fs/ocfs2/journal.c:2215 [inline] ocfs2_recover_orphans fs/ocfs2/journal.c:2299 [inline] ocfs2_complete_recovery+0xc37/0x20b0 fs/ocfs2/journal.c:1366 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x1d1 pfn:0x5fe76 flags: 0x80000000000000(node=0|zone=1) raw: 0080000000000000 ffffea00017f93c8 ffffea00017f9ec8 0000000000000000 raw: 00000000000001d1 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 6496, tgid 6496 (cmp), ts 169634784819, free_ts 169719162751 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486 folio_alloc_mpol_noprof mm/mempolicy.c:2505 [inline] vma_alloc_folio_noprof+0xe4/0x280 mm/mempolicy.c:2540 folio_prealloc+0x30/0x180 mm/memory.c:-1 do_cow_fault mm/memory.c:5779 [inline] do_fault mm/memory.c:5891 [inline] do_pte_missing+0x509/0x27a0 mm/memory.c:4401 handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0xcc1/0x1330 mm/memory.c:6580 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 page last free pid 6496 tgid 6496 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] free_unref_folios+0xc28/0x1810 mm/page_alloc.c:3000 folios_put_refs+0x569/0x670 mm/swap.c:1002 free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:355 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 exit_mmap+0x439/0xb10 mm/mmap.c:1290 __mmput+0xcb/0x3d0 kernel/fork.c:1173 exit_mm+0x1da/0x2c0 kernel/exit.c:581 do_exit+0x658/0x2310 kernel/exit.c:959 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1121 __pfx_syscall_get_nr+0x0/0x10 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88805fe76680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805fe76700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88805fe76780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805fe76800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805fe76880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Tested on: commit: d358e525 Merge tag 'for-6.19/dm-changes' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=138ef992580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f315601b98a91c0b dashboard link: https://syzkaller.appspot.com/bug?extid=c897823f699449cc3eb4 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=123891c2580000