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2002:a05:6820:f028:b0:6c3:19de:d1ea with SMTP id 006d021491bc7-6c53fa6f56cmr4904395eaf.6.1789437781676; Mon, 14 Sep 2026 19:03:01 -0700 (PDT) Date: Mon, 14 Sep 2026 19:03:01 -0700 In-Reply-To: <6aa8a1b1.9cc10357.125c5.d000SMTPIN_ADDED_BROKEN@gmr-mx.google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa8a755.a211d2ce.1a5198.02a3.GAE@google.com> Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dbFindLeaf (2) From: syzbot To: jchuang26@m.fudan.edu.cn, 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 copy_folio_from_iter_atomic ================================================================== BUG: KASAN: use-after-free in memcpy_from_iter lib/iov_iter.c:85 [inline] BUG: KASAN: use-after-free in iterate_bvec include/linux/iov_iter.h:123 [inline] BUG: KASAN: use-after-free in iterate_and_advance2 include/linux/iov_iter.h:306 [inline] BUG: KASAN: use-after-free in iterate_and_advance include/linux/iov_iter.h:330 [inline] BUG: KASAN: use-after-free in __copy_from_iter lib/iov_iter.c:261 [inline] BUG: KASAN: use-after-free in copy_folio_from_iter_atomic+0xbbf/0x1a30 lib/iov_iter.c:491 Read of size 4096 at addr ffff88803a53c000 by task kworker/u8:23/3166 CPU: 1 UID: 0 PID: 3166 Comm: kworker/u8:23 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026 Workqueue: loop0 loop_workfn Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 memcpy_from_iter lib/iov_iter.c:85 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:261 [inline] copy_folio_from_iter_atomic+0xbbf/0x1a30 lib/iov_iter.c:491 generic_perform_write+0x5a8/0x8b0 mm/filemap.c:4392 shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3440 lo_rw_aio+0xc78/0xf30 include/linux/percpu-rwsem.h:-1 do_req_filebacked drivers/block/loop.c:430 [inline] loop_handle_cmd drivers/block/loop.c:1949 [inline] loop_process_work+0x638/0x11d0 drivers/block/loop.c:1984 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0x92d/0xe10 kernel/workqueue.c:3560 kthread+0x38b/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x36 pfn:0x3a53c flags: 0x80000000000000(node=0|zone=1) raw: 0080000000000000 ffffea0000c43308 ffffea0001046588 0000000000000000 raw: 0000000000000036 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0xdc0(GFP_KERNEL|__GFP_ZERO), pid 6669, tgid 6668 (syz.0.55), ts 183365717538 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2591/0x2600 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x230/0x5c0 mm/page_alloc.c:5436 alloc_pages_mpol+0xd4/0x280 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0xd2/0x2f0 mm/mempolicy.c:2577 lbmLogInit fs/jfs/jfs_logmgr.c:1813 [inline] lmLogInit+0x357/0x1a20 fs/jfs/jfs_logmgr.c:1267 open_inline_log fs/jfs/jfs_logmgr.c:1173 [inline] lmLogOpen+0x4e3/0xf90 fs/jfs/jfs_logmgr.c:1067 jfs_mount_rw+0xf3/0x670 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x769/0xda0 fs/jfs/super.c:533 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1873 vfs_get_tree+0x92/0x2a0 fs/super.c:1933 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x155/0x510 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6431 tgid 6431 ts 183464359442 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xf3d/0x1000 mm/page_alloc.c:2962 lbmLogShutdown fs/jfs/jfs_logmgr.c:1861 [inline] lmLogShutdown+0x44e/0x850 fs/jfs/jfs_logmgr.c:1681 lmLogClose+0x28c/0x530 fs/jfs/jfs_logmgr.c:1457 jfs_umount+0x2da/0x3b0 fs/jfs/jfs_umount.c:124 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x13d/0x2d0 fs/super.c:755 kill_block_super+0x44/0xa0 fs/super.c:1904 deactivate_locked_super+0xbc/0x110 fs/super.c:589 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x14e/0x570 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x317/0x510 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803a53bf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88803a53bf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88803a53c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88803a53c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88803a53c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Tested on: commit: 58785836 Merge tag 'nfsd-7.3-1' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=146248c9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a8915f6d5e9da1d8 dashboard link: https://syzkaller.appspot.com/bug?extid=1afe7ef2d0062e19eeb3 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=13ca75f9580000