From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f78.google.com (mail-oa1-f78.google.com [209.85.160.78]) (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 53E3D221FB4 for ; Mon, 10 Aug 2026 00:23:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786321410; cv=none; b=F7aPevHDY4xEAYiGinZUAOn09Id0Zov0n7YhKdGR75BXab8CPMR7CS9ZQZhhyekFQ8k7xl+xBroiqMg3fvP/B/LG9Qaj5851mOj7zcUdB5jY0sOJNgPWdlNc0/d6UVC+84OrlqGC7DOB7WE2lQJCA5NAFAglnjBvDqB2/Ct95VI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786321410; c=relaxed/simple; bh=qm8LABPELvkllpS0TBT6PNFecL6IvXCnPy0cjAkw2sY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=caahE/Znozzt3kFH7KUtbnpvF+EoTf3lWYSt3aBsZeMASNR+SfJl5vkB2mWTSm2nBMnWeUSiLNoAvg3mugre6KlxUFO2Py4kzhpvR+x91UFAP2N+dpKRU67+5Ktn2/v/4ela4RlfULmKppf0mXqqiMHnJ/t5jz+b2sEwvWB4TDs= 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=209.85.160.78 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-oa1-f78.google.com with SMTP id 586e51a60fabf-455d6f14efeso354093fac.3 for ; Sun, 09 Aug 2026 17:23:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786321407; x=1786926207; 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=biw8+KEd9p5P7Ve2i/RpSLqWuOxWajehnU628jqJQ3A=; b=Ak6YcyiQDZ+Xow4mIqmIiLA2Il+mlT/+sPBZfFa7LR4XSsxhe22V//K/YYAHaezzA8 EaQfnpDR1idMF0gicZvYwK0b35oIbmuUPK30umssgARI1Ptr0DMmnEAz3JgXMm22l4hL +1Aoh3KWLV35CDEk/BTSGNIP+sZ1mnuA2N4+qnwjk+Cp7hkrpJnmKtCzYHoKMuNE3lVs OK/x/u3Na/m1rSlZhe29ae3QlrOMwu+f2s6NYZkyn1tWE/0tXQdRPUMPmW0SwXqvzQOO XJ4JQimMGNSfUaUKu/at8CXXeaP6vUvS85weCQfLXqA4QzvdslKXuKO0vP6z+ssOPH0G OSqQ== X-Forwarded-Encrypted: i=1; AHgh+RpAP8hm7TAvFeZmLk+ewQyWSr+smFbEvxOosbEoG3dYd1ooDdKkUFEfgNpnbARMIergXz1DjJLnRceS8XY=@vger.kernel.org X-Gm-Message-State: AOJu0YyMh5kmhj/eBYhCaSLgMnnGFjgI/Ku6TfPdodS3be85tnGmmaQI eojqt97jQemYyDcefcQSEKQS5z6DhaGkM5x5E2Q9pQ8HIjBoZ6IdMhP4YDI/aw7dBNmsHim2U9S MGrrcQ5eIvCyirDK48+jMM3e0vRfP/rwuoUYE8tUWMdNpgZMUieum8NH/EV0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1688:b0:495:e0a9:8c0 with SMTP id 5614622812f47-4b1ab96cd2fmr8055787b6e.11.1786321406991; Sun, 09 Aug 2026 17:23:26 -0700 (PDT) Date: Sun, 09 Aug 2026 17:23:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7919fe.9c11d2ce.289b96.00df.GAE@google.com> Subject: [syzbot] [net?] [afs?] KASAN: slab-use-after-free Read in rxrpc_destroy_all_peers From: syzbot To: davem@davemloft.net, dhowells@redhat.com, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, marc.dionne@auristor.com, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 06cf61899d64 Merge tag 'x86-urgent-2026-08-08' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16765fb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=c876adfab6362679008c 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/260ea970a68e/disk-06cf6189.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0005e8a7195f/vmlinux-06cf6189.xz kernel image: https://storage.googleapis.com/syzbot-assets/f061ed2152ca/bzImage-06cf6189.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c876adfab6362679008c@syzkaller.appspotmail.com rxrpc: Leaked peer e1 {1} [0000:0000:0000:0000:0000:0000:0000:0001]:7003 ================================================================== BUG: KASAN: slab-use-after-free in rxrpc_destroy_all_peers+0x1ce/0x1d0 net/rxrpc/peer_object.c:461 Read of size 8 at addr ffff88803528cc20 by task kworker/u8:6/1029 CPU: 0 UID: 0 PID: 1029 Comm: kworker/u8:6 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: netns cleanup_net 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/0x1c0 mm/kasan/report.c:595 rxrpc_destroy_all_peers+0x1ce/0x1d0 net/rxrpc/peer_object.c:461 rxrpc_exit_net+0x83/0xc0 net/rxrpc/net_ns.c:114 ops_exit_list net/core/net_namespace.c:199 [inline] ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:252 cleanup_net+0x499/0x920 net/core/net_namespace.c:702 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 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 5852: 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 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2e5/0x6c0 mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] rxrpc_alloc_peer+0xa7/0x400 net/rxrpc/peer_object.c:229 rxrpc_create_peer net/rxrpc/peer_object.c:293 [inline] rxrpc_lookup_peer+0x168/0x680 net/rxrpc/peer_object.c:354 rxrpc_kernel_lookup_peer+0xa8/0xe0 net/rxrpc/af_rxrpc.c:285 afs_merge_fs_addr6+0x186/0x460 fs/afs/addr_list.c:344 afs_parse_text_addrs+0x3f2/0xa10 fs/afs/addr_list.c:222 afs_alloc_cell fs/afs/cell.c:181 [inline] afs_lookup_cell+0xbb6/0x1940 fs/afs/cell.c:273 afs_proc_cells_write+0x2a3/0x3a0 fs/afs/proc.c:125 proc_simple_write+0x10e/0x1a0 fs/proc/generic.c:843 pde_write fs/proc/inode.c:330 [inline] proc_reg_write+0x240/0x330 fs/proc/inode.c:342 vfs_write+0x2aa/0x1050 fs/read_write.c:685 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 15: 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:2677 [inline] __rcu_free_sheaf_prepare+0x5d/0x2f0 mm/slub.c:2928 rcu_free_sheaf+0x1a/0xe0 mm/slub.c:5978 rcu_do_batch kernel/rcu/tree.c:2645 [inline] rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2897 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1076 [inline] run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068 smpboot_thread_fn+0x3d3/0xaa0 kernel/smpboot.c:160 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 The buggy address belongs to the object at ffff88803528cc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 32 bytes inside of freed 512-byte region [ffff88803528cc00, ffff88803528ce00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3528c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88813fe21c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88813fe21c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 16783483369, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x640 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x376/0x680 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_node_track_caller_noprof+0x679/0x830 mm/slub.c:5471 __do_krealloc mm/slub.c:6837 [inline] krealloc_node_align_noprof+0x1f9/0x3e0 mm/slub.c:6858 add_sysfs_param+0xdb/0x970 kernel/params.c:648 kernel_add_sysfs_param kernel/params.c:797 [inline] param_sysfs_builtin kernel/params.c:836 [inline] param_sysfs_builtin_init+0x310/0x3f0 kernel/params.c:972 do_one_initcall+0x11d/0x700 init/main.c:1347 do_initcall_level init/main.c:1409 [inline] do_initcalls init/main.c:1425 [inline] do_basic_setup init/main.c:1445 [inline] kernel_init_freeable+0x6ea/0x7b0 init/main.c:1658 kernel_init+0x1f/0x1e0 init/main.c:1548 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page_owner free stack trace missing Memory state around the buggy address: ffff88803528cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803528cb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803528cc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803528cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803528cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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