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In-Reply-To: <20260417101153.2489040-1-tristmd@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e20af7.a00a0220.1cdc.0010.GAE@google.com> Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dbFindLeaf (2) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tristmd@gmail.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 =========[ 176.559683][ T1419] ================================================================== 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+0xbb5/0x1ad0 lib/iov_iter.c:491 Read of size 4096 at addr ffff88805fba7000 by task kworker/u8:10/1419 CPU: 1 UID: 0 PID: 1419 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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+0xbb5/0x1ad0 lib/iov_iter.c:491 generic_perform_write+0x5b1/0x8b0 mm/filemap.c:4342 shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3498 lo_rw_aio+0xc80/0xf00 include/linux/percpu-rwsem.h:-1 do_req_filebacked drivers/block/loop.c:433 [inline] loop_handle_cmd drivers/block/loop.c:1925 [inline] loop_process_work+0x637/0x11b0 drivers/block/loop.c:1960 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385 worker_thread+0x8a2/0xda0 kernel/workqueue.c:3466 kthread+0x388/0x470 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:0xffff88805fba71e0 pfn:0x5fba7 flags: 0x80000000000000(node=0|zone=1) raw: 0080000000000000 ffffea0000eb0588 ffffea00017ee908 0000000000000000 raw: ffff88805fba71e0 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 6711, tgid 6710 (syz.0.52), ts 176435790980, free_ts 176559630453 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1860 prep_new_page mm/page_alloc.c:1868 [inline] get_page_from_freelist+0x27c8/0x2840 mm/page_alloc.c:3948 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5228 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0xd2/0x2f0 mm/mempolicy.c:2581 lbmLogInit fs/jfs/jfs_logmgr.c:1813 [inline] lmLogInit+0x357/0x1a00 fs/jfs/jfs_logmgr.c:1267 open_inline_log fs/jfs/jfs_logmgr.c:1173 [inline] lmLogOpen+0x4e1/0xfa0 fs/jfs/jfs_logmgr.c:1067 jfs_mount_rw+0xee/0x670 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x754/0xd80 fs/jfs/super.c:532 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694 vfs_get_tree+0x92/0x2a0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3758 [inline] do_new_mount+0x341/0xd30 fs/namespace.c:3834 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4360 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6477 tgid 6477 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1404 [inline] __free_frozen_pages+0xf48/0x1080 mm/page_alloc.c:2945 lbmLogShutdown fs/jfs/jfs_logmgr.c:1861 [inline] lmLogShutdown+0x44e/0x850 fs/jfs/jfs_logmgr.c:1681 lmLogClose+0x28a/0x520 fs/jfs/jfs_logmgr.c:1457 jfs_umount+0x2fb/0x3d0 fs/jfs/jfs_umount.c:124 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x13d/0x2d0 fs/super.c:646 kill_block_super+0x44/0x90 fs/super.c:1725 deactivate_locked_super+0xbc/0x130 fs/super.c:476 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312 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:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __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:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88805fba6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805fba6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805fba7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805fba7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805fba7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Tested on: commit: 43cfbdda Merge tag 'for-linus-iommufd' of git://git.ke.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1265f036580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b47aea80c73a133a dashboard link: https://syzkaller.appspot.com/bug?extid=1afe7ef2d0062e19eeb3 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1525f036580000