From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (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 95CCB3AFB0E for ; Tue, 4 Aug 2026 01:44:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785807872; cv=none; b=HfbwI9Un3ABmTYUx+uulbp2OmSgP5Mg4OsSx7Ps9ENLhYfxcdaLOh8HXNdHPditDztNdbZgQXz5PrN5f3iHmnCF0ePcv68x6Doo/qKv1Jukm00iRbJMZ+o/8SlsFM1YRgUrHs5XmEMYYXQQukO55NDGVBaHaHBTDw+btEKGXyHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785807872; c=relaxed/simple; bh=lIWocfvUF7w0yCpzu9qQnTeeTrMrDw8aCmTpWrzCaxM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=KNywoQ1+ihtqo+9rLoGMYWYHfx5DRDKPz5W9eSlWvRK1ck+4+s8NK/XJyEvWbhw7D+0Wega1vruPjLYdimOEFCfYcDuWRvX4WGI4TAmk5t51CMJrQB9pbYMT+SmvlW7T/+PuyvLBwkloGaAvFuwl7RGk/BDzvu6/ATevmfXfGNQ= 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=209.85.167.207 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-oi1-f207.google.com with SMTP id 5614622812f47-485ebc5706cso850284b6e.0 for ; Mon, 03 Aug 2026 18:44:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785807868; x=1786412668; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=BCtDOLigK+Gr+JDvUm8wMxt9MXbB+xZlmfyacjgIwr4=; b=CQz2M7EJsrw3bnq8GhDHrqgzHf3dEN3lgCQRHdIIgdV+j8HXOAImCL5PybjKnfwXr2 BbqumuJi+mMMi8jfRkbMTW6EiF5vRI0d6DhP3Q5YCXmJhxQa7QoVeiT/dqzjCFW7GR8x 7XMjUUDHBiY5JOYk3oOM8vZFUupm2D5VdEyP/TkU4c3V/9cB3l++XJNYNn+kzwnnw5mg NUrQEotahMDVfezPg2boiEAsX70JlM8C3gQNJfsiGfIoMBkufHkWVm5wWBZ8aDeoXn47 iAltiG87UFsfZS2Iyylh5nbhjX4bATtjPXff10UC0V6Z8MqKavHrJ1BXT0GcD/ISi4Ru k+Ww== X-Forwarded-Encrypted: i=1; AHgh+RqdneCMHk2vOz/bSqjxOPDcpxTfa1EAliMT/teTHP+3H2aQ0weX8W0mRY8Yer22w4cVrF0hh6HEpAAdqbk=@vger.kernel.org X-Gm-Message-State: AOJu0YxO8dR4XYRobtL6GSp+sm8NAzz2FxjcRj54+WRAummSO04xhlbj IMq/3S1s9is26FWaWRgvKKWuHWjgX3GKT/H8erN1MUtYNU1My4NWrKJo2bZYotW9FPuHzU6Ak7p LHnclE2/hi47OxcMb7cahX3UOL1CfyBA3gxjjWiCaG3mvbZGyAp9/nCMgknE= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4f4a:b0:495:f8a5:8797 with SMTP id 5614622812f47-4af983bf895mr2631574b6e.0.1785807868370; Mon, 03 Aug 2026 18:44:28 -0700 (PDT) Date: Mon, 03 Aug 2026 18:44:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7143fc.13623e66.bdc14.0007.GAE@google.com> Subject: [syzbot] [jfs?] KASAN: slab-use-after-free Read in lmLog 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: fc46aed51f62 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11019499580000 kernel config: https://syzkaller.appspot.com/x/.config?x=cb17729fb04b1e3a dashboard link: https://syzkaller.appspot.com/bug?extid=5e630048345c54c4d7f4 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/955cec68f017/disk-fc46aed5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a9cb903c7039/vmlinux-fc46aed5.xz kernel image: https://storage.googleapis.com/syzbot-assets/54a5b24a2b25/bzImage-fc46aed5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5e630048345c54c4d7f4@syzkaller.appspotmail.com loop4: detected capacity change from 0 to 32768 add_index: next_index = 0. Resetting! ================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline] BUG: KASAN: slab-use-after-free in mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578 Read of size 1 at addr ffff8880407c2150 by task syz.4.88/6240 CPU: 1 UID: 0 PID: 6240 Comm: syz.4.88 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5842 __mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline] mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578 lmLog+0x78/0xa10 fs/jfs/jfs_logmgr.c:234 dtLog fs/jfs/jfs_txnmgr.c:1620 [inline] txLog fs/jfs/jfs_txnmgr.c:1402 [inline] txCommit+0x1c92/0x54a0 fs/jfs/jfs_txnmgr.c:1266 add_missing_indices+0x7e5/0xb30 fs/jfs/jfs_dtree.c:2671 jfs_readdir+0x1d15/0x33f0 fs/jfs/jfs_dtree.c:3028 wrap_directory_iterator+0x99/0xe0 fs/readdir.c:67 iterate_dir+0x2f1/0x4e0 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fae48cedf99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fae46f25028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fae48f76090 RCX: 00007fae48cedf99 RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000005 RBP: 00007fae48d84ec4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fae48f76128 R14: 00007fae48f76090 R15: 00007ffcffa6fbb8 Allocated by task 6240: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3d2/0x6b0 mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] open_inline_log fs/jfs/jfs_logmgr.c:1157 [inline] lmLogOpen+0x2d1/0xf90 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:1640 vfs_get_tree+0x92/0x2a0 fs/super.c:1700 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3841 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6236: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x1c5/0x6c0 mm/slub.c:6692 lmLogClose+0x296/0x530 fs/jfs/jfs_logmgr.c:-1 jfs_reconfigure+0x6d3/0x990 fs/jfs/super.c:421 reconfigure_super+0x232/0x8f0 fs/super.c:1020 do_remount fs/namespace.c:3407 [inline] path_mount+0xd4b/0x1040 fs/namespace.c:4153 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880407c2000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 336 bytes inside of freed 1024-byte region [ffff8880407c2000, ffff8880407c2400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x407c0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813ffb1dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813ffb1dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5594, tgid 5594 (syz-executor), ts 77840044934, free_ts 75572931790 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x262a/0x26a0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3380 new_slab mm/slub.c:3426 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x330/0x690 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __do_kmalloc_node mm/slub.c:5333 [inline] __kmalloc_noprof+0x544/0x780 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] tomoyo_init_log+0x1aaf/0x1fa0 security/tomoyo/audit.c:273 tomoyo_supervisor+0x35f/0x1560 security/tomoyo/common.c:2232 tomoyo_audit_path_number_log security/tomoyo/file.c:239 [inline] tomoyo_path_number_perm+0x463/0x5f0 security/tomoyo/file.c:739 security_path_chmod+0x132/0x330 security/security.c:1581 chmod_common+0x1a7/0x480 fs/open.c:632 do_fchmodat+0x12d/0x230 fs/open.c:682 __do_sys_chmod fs/open.c:706 [inline] __se_sys_chmod fs/open.c:704 [inline] __x64_sys_chmod+0x62/0x70 fs/open.c:704 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 1201 tgid 1201 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x10e7/0x11c0 mm/page_alloc.c:2950 __folio_put+0x30f/0x3c0 mm/swap.c:112 folio_put include/linux/mm.h:2124 [inline] put_page include/linux/mm.h:2193 [inline] put_netmem include/net/netmem.h:394 [inline] skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x573/0xab0 net/core/skbuff.c:1110 skb_release_all net/core/skbuff.c:1191 [inline] __kfree_skb+0x5d/0x210 net/core/skbuff.c:1205 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3698 [inline] tcp_ack+0x28f7/0x8050 net/ipv4/tcp_input.c:4400 tcp_rcv_established+0x1527/0x2910 net/ipv4/tcp_input.c:6589 tcp_v4_do_rcv+0x959/0x13f0 net/ipv4/tcp_ipv4.c:1854 tcp_v4_rcv+0x27d4/0x3170 net/ipv4/tcp_ipv4.c:2248 ip_protocol_deliver_rcu+0x21d/0x440 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 dst_input include/net/dst.h:481 [inline] ip_sublist_rcv_finish+0x1f0/0x240 net/ipv4/ip_input.c:623 ip_list_rcv_finish net/ipv4/ip_input.c:675 [inline] ip_sublist_rcv+0x767/0xa70 net/ipv4/ip_input.c:683 ip_list_rcv+0x3ec/0x440 net/ipv4/ip_input.c:717 __netif_receive_skb_list_ptype net/core/dev.c:6256 [inline] __netif_receive_skb_list_core+0x804/0x830 net/core/dev.c:6302 __netif_receive_skb_list net/core/dev.c:6354 [inline] netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6445 Memory state around the buggy address: ffff8880407c2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880407c2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880407c2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880407c2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880407c2200: 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