From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8B68A3D3D18 for ; Tue, 2 Jun 2026 10:40:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780396828; cv=none; b=ooS3z46J2o4ffa++5FTQ19/6SqWnPK59s8PqmMa6vbN7aZvj2Y4ueW6t04KYhmWj6wTJ38Oo399xOqNdXpnRZnElexhX1t7VDA/j9SGJ3hblhd3Z44AJJ5QuCeuxoaeJcTnTqZggTu3IX+L3d8PUqp6KL/WdNhoh8/UJLGlzmx4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780396828; c=relaxed/simple; bh=NiBY8dBSgdy58bojMFXWV2agQxzbSru58J3G+o7w1po=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=GHWyrhTZ1EcjB1IcZx9K9X/VkrMg6ogrPzAeaEN6WTyr4hdqYjHn8JMmnRHH+XTGLqBP4iY9POZbut6xMN7G8QtrLCvhhuqIP6dYqm9irT4rJnoSwHsWKp3LvmD+oyA9I4adlXRRuzPinN3MaIvNu9WV4sXN2Qusi5/G+Jgyh8U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.77 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f77.google.com with SMTP id 46e09a7af769-7e6b59d85dcso4970911a34.3 for ; Tue, 02 Jun 2026 03:40:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780396825; x=1781001625; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=pqn+8iaIKY7Wy7YVhUqwMkNczmMfEuJzOdHZArakyCw=; b=VfL0vIwL8YV9g5DDaVQxfNP2dDqH63t6p6hZV/JS7nCWVxBhFRR4BknAlUAkMWfOJl nBb5CFE88m0WFjI8P15HaUBf6PjRM5OR+d1hqEXOSqtGHDAo0WEO4PBwSLskJhsb33si cOrFjoT//fJLbJiIX1Pu7rkTVzFjfii9McbrI2jCnej4S/OGg/VOmGXQLH+EaxSqPLq9 9Zy/Zv3IVVq0b0c2s3rPj/Iy4prNkWtp0KR8T1WxppnTo1OtLLhNH2dIkGOj04m1Hw21 9+mUghlrb+cwm4S3gUMf7M1lJ0U8vYSPO8V1YYqAHYr54acOAi1gi0hjzBxlbX3cBMob uo3g== X-Forwarded-Encrypted: i=1; AFNElJ/nlBdGAYunH5vzeKJjDo/ud4U8HARtnVQZAbGfEEAzTY1oKRq3CQQhPr8SOT7rmHiIBooyQ9l4vsn5hs8=@vger.kernel.org X-Gm-Message-State: AOJu0YyoODut2KLESY/bj/d2lWUGr9Lj1xn92JTpN//yDRvXIrvlmlY3 e1PpNDhYarH3x0tIlRtHutiKgHxZQP5gLGdi6wL8JxLo2amFO9enYuqmMPqUnluuNngaSHoJ7+a xiqjAa+FQ4XM3dw4bZNc6n69s/3MOA3PuOLYVUQ8XvI2KiIMJAkgCRzHIqUY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4cc8:b0:694:914f:c18f with SMTP id 006d021491bc7-69e102c9234mr7172687eaf.3.1780396825636; Tue, 02 Jun 2026 03:40:25 -0700 (PDT) Date: Tue, 02 Jun 2026 03:40:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a1eb319.c1435f33.112120.0156.GAE@google.com> Subject: [syzbot] [jfs?] KASAN: slab-use-after-free Write in lmLogSync From: syzbot To: jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org, shaggy@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6a97c4d5262d Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10c04d36580000 kernel config: https://syzkaller.appspot.com/x/.config?x=67ffb7a3dae3b364 dashboard link: https://syzkaller.appspot.com/bug?extid=ea7ed3bb2f444cb4dfeb compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/27fccab6d587/disk-6a97c4d5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4e2627cdbafb/vmlinux-6a97c4d5.xz kernel image: https://storage.googleapis.com/syzbot-assets/061ff801444b/bzImage-6a97c4d5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ea7ed3bb2f444cb4dfeb@syzkaller.appspotmail.com ... Log Wrap ... Log Wrap ... Log Wrap ... ================================================================== BUG: KASAN: slab-use-after-free in lmLogSync+0x794/0x7b0 fs/jfs/jfs_logmgr.c:1003 Write of size 4 at addr ffff88807d709218 by task jfsCommit/117 CPU: 0 UID: 0 PID: 117 Comm: jfsCommit Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1d0 mm/kasan/report.c:595 lmLogSync+0x794/0x7b0 fs/jfs/jfs_logmgr.c:1003 jfs_syncpt+0x89/0xa0 fs/jfs/jfs_logmgr.c:1039 txEnd+0x318/0x490 fs/jfs/jfs_txnmgr.c:551 txLazyCommit fs/jfs/jfs_txnmgr.c:2686 [inline] jfs_lazycommit+0x748/0xab0 fs/jfs/jfs_txnmgr.c:2735 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 15951: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] open_inline_log fs/jfs/jfs_logmgr.c:1157 [inline] lmLogOpen+0x571/0x1360 fs/jfs/jfs_logmgr.c:1067 jfs_mount_rw+0x2e0/0x690 fs/jfs/jfs_mount.c:257 jfs_fill_super+0xbc0/0xf50 fs/jfs/super.c:532 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694 vfs_get_tree+0x92/0x320 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3758 [inline] do_new_mount fs/namespace.c:3834 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4154 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount fs/namespace.c:4360 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4360 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x860 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 10281: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6251 [inline] kfree+0x223/0x6c0 mm/slub.c:6566 lmLogClose+0x55f/0x6f0 fs/jfs/jfs_logmgr.c:1458 jfs_umount+0x30c/0x430 fs/jfs/jfs_umount.c:124 jfs_put_super+0x88/0x1a0 fs/jfs/super.c:194 generic_shutdown_super+0x167/0x360 fs/super.c:646 kill_block_super+0x3b/0xa0 fs/super.c:1725 deactivate_locked_super+0xc1/0x1b0 fs/super.c:476 deactivate_super fs/super.c:509 [inline] deactivate_super+0xe7/0x110 fs/super.c:505 cleanup_mnt+0x21f/0x450 fs/namespace.c:1312 task_work_run+0x150/0x240 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+0x107/0x4f0 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:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x706/0x860 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807d709000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 536 bytes inside of freed 1024-byte region [ffff88807d709000, ffff88807d709400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807d70d000 pfn:0x7d708 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88813fe34dc0 ffffea0001ddac10 ffffea0001e99e10 raw: ffff88807d70d000 000000080010000e 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88813fe34dc0 ffffea0001ddac10 ffffea0001e99e10 head: ffff88807d70d000 000000080010000e 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5636, tgid 5636 (syz-executor), ts 92244588377, free_ts 92228867410 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x11a6/0x33b0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab mm/slub.c:3467 [inline] new_slab+0xa6/0x6c0 mm/slub.c:3525 refill_objects+0x277/0x420 mm/slub.c:7272 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x375/0x650 mm/slub.c:4652 alloc_from_pcs mm/slub.c:4750 [inline] slab_alloc_node mm/slub.c:4884 [inline] __do_kmalloc_node mm/slub.c:5295 [inline] __kvmalloc_node_noprof+0x7da/0xa00 mm/slub.c:6833 bucket_table_alloc.isra.0+0x88/0x460 lib/rhashtable.c:194 rhashtable_init_noprof+0x43b/0x890 lib/rhashtable.c:1108 ipc_init_ids+0x92/0x280 ipc/util.c:120 create_ipc_ns ipc/namespace.c:89 [inline] copy_ipcs+0x5c8/0x7e0 ipc/namespace.c:116 create_new_namespaces+0x20a/0xac0 kernel/nsproxy.c:112 unshare_nsproxy_namespaces+0xf2/0x220 kernel/nsproxy.c:234 ksys_unshare+0x438/0xab0 kernel/fork.c:3243 __do_sys_unshare kernel/fork.c:3317 [inline] __se_sys_unshare kernel/fork.c:3315 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3315 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x860 arch/x86/entry/syscall_64.c:94 page last free pid 5646 tgid 5646 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0x747/0x1040 mm/page_alloc.c:2943 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4570 [inline] slab_alloc_node mm/slub.c:4899 [inline] __kmalloc_cache_noprof+0x243/0x6f0 mm/slub.c:5415 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] hci_chan_create+0xa6/0x410 net/bluetooth/hci_conn.c:2874 l2cap_conn_add.part.0+0x1a/0xb00 net/bluetooth/l2cap_core.c:6997 l2cap_conn_add net/bluetooth/l2cap_core.c:69 [inline] l2cap_connect_cfm+0x43e/0xf80 net/bluetooth/l2cap_core.c:7378 hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline] le_conn_complete_evt+0x197c/0x1f60 net/bluetooth/hci_event.c:5865 hci_le_conn_complete_evt+0x23c/0x3a0 net/bluetooth/hci_event.c:5891 hci_le_meta_evt+0x34a/0x5f0 net/bluetooth/hci_event.c:7529 hci_event_func net/bluetooth/hci_event.c:7793 [inline] hci_event_packet+0x51c/0xcd0 net/bluetooth/hci_event.c:7847 hci_rx_work+0x451/0xfc0 net/bluetooth/hci_core.c:4077 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314 process_scheduled_works kernel/workqueue.c:3397 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478 kthread+0x370/0x450 kernel/kthread.c:436 Memory state around the buggy address: ffff88807d709100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d709180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807d709200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d709280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d709300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup