From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 65F89CA4E; Wed, 30 Jul 2025 06:16:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753856207; cv=none; b=aPS8kccvckHTqEt/oEpCD468jCqzC9lAORsPAhC8/dEwP+HiCdeNJMQgs5HfgVrNDu6lnLmmp4MJjkmm/5tzHF4QdeUgBWmogegwrSVNNnSkb85aQNfpIUd5U7rk3FP5HYtJ8jPMiPHiMPGZ/vdNley2q+klHN9dVXjPNDdW4XQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753856207; c=relaxed/simple; bh=Dvbln3KKN9azgWEiaMVam0molMPsJ5r4azFd+6OU+6A=; h=Subject:To:References:From:Message-ID:Date:MIME-Version: In-Reply-To:Content-Type; b=HMsREvFUTel1C8uLb0hrMsQvO66ncJOZ42SZJaeZBgB4YNyx04OBwjdrxaJmaElfKTy/gNhAFs4y70Do3BH/Oiwbot5/4PUAehxyb3sqEGzywFvuDxbj6v0Jmpfna3OyFqXBKm1LXpS4W75KIq6HtfVfkEWqxSfulPkZ3+6DldA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4bsMRv2VgGzYQtv9; Wed, 30 Jul 2025 14:16:43 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 0ABD41A01A5; Wed, 30 Jul 2025 14:16:42 +0800 (CST) Received: from [10.174.179.143] (unknown [10.174.179.143]) by APP4 (Coremail) with SMTP id gCh0CgAXkxPIuIloQ1bbBw--.15974S3; Wed, 30 Jul 2025 14:16:41 +0800 (CST) Subject: Re: [syzbot] [fuse?] [block?] KASAN: slab-use-after-free Read in disk_add_events To: Yu Kuai , syzbot , axboe@kernel.dk, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com, Xiao Ni References: <68894408.a00a0220.26d0e1.0013.GAE@google.com> <762c700c-7094-e816-9fcf-b4cfea26283e@huaweicloud.com> From: Yu Kuai Message-ID: <53df4f00-5604-677e-e14e-0948a72bb8c3@huaweicloud.com> Date: Wed, 30 Jul 2025 14:16:40 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <762c700c-7094-e816-9fcf-b4cfea26283e@huaweicloud.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-CM-TRANSID:gCh0CgAXkxPIuIloQ1bbBw--.15974S3 X-Coremail-Antispam: 1UD129KBjvAXoWfGFWUGrW3Xr17urWUGF1xXwb_yoW8GF1xKo WIgr4rCF48GFWYyFy0yrW5tay3GFykXFsrAr4Ykr45WFy7Z34UJ34UKw4avrW2yr48Wa13 Ar12qF1FqwsrJrn7n29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7v73VFW2AGmfu7bjvjm3 AaLaJ3UjIYCTnIWjp_UUUYh7AC8VAFwI0_Gr0_Xr1l1xkIjI8I6I8E6xAIw20EY4v20xva j40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2 x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8 Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26r xl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj 6xIIjxv20xvE14v26r1Y6r17McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr 0_Gr1lF7xvr2IY64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7Mxk0xIA0c2IEe2xFo4CE bIxvr21lc7CjxVAaw2AFwI0_Jw0_GFyl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7 v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF 1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIx AIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI 42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWI evJa73UjIFyTuYvjfUoWlkDUUUU X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ 在 2025/07/30 14:14, Yu Kuai 写道: > +CC Xiao Forgot to CC in the last emial, sorry for the noisy. Thanks, Kuai > > 在 2025/07/30 5:58, syzbot 写道: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit:    ced1b9e0392d Merge tag 'ata-6.17-rc1' of >> git://git.kernel... >> git tree:       upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=133b8cf0580000 >> kernel config: >> https://syzkaller.appspot.com/x/.config?x=52c12ce9080f644c >> dashboard link: >> https://syzkaller.appspot.com/bug?extid=fa3a12519f0d3fd4ec16 >> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils >> for Debian) 2.40 >> syz repro: >> https://syzkaller.appspot.com/x/repro.syz?x=154b31bc580000 >> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=171a9782580000 >> > > This looks like the same cause with another report: > > https://lore.kernel.org/all/68894408.a00a0220.26d0e1.0012.GAE@google.com/ > > The mddev kobject liftime is broken, now in the case del_work is queued, > means mddev is about to be freed, meanwhile md_open can succeed. > > Thanks, > Kuai > >> Downloadable assets: >> disk image (non-bootable): >> https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ced1b9e0.raw.xz >> >> vmlinux: >> https://storage.googleapis.com/syzbot-assets/c709b0d9538c/vmlinux-ced1b9e0.xz >> >> kernel image: >> https://storage.googleapis.com/syzbot-assets/129af0799fa3/bzImage-ced1b9e0.xz >> >> >> IMPORTANT: if you fix the issue, please add the following tag to the >> commit: >> Reported-by: syzbot+fa3a12519f0d3fd4ec16@syzkaller.appspotmail.com >> >> ================================================================== >> BUG: KASAN: slab-use-after-free in >> __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32 >> Read of size 8 at addr ffff888036fa1400 by task syz.2.1231/9834 >> >> CPU: 3 UID: 0 PID: 9834 Comm: syz.2.1231 Not tainted >> 6.16.0-syzkaller-00857-gced1b9e0392d #0 PREEMPT(full) >> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS >> 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 >> Call Trace: >>   >>   __dump_stack lib/dump_stack.c:94 [inline] >>   dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 >>   print_address_description mm/kasan/report.c:378 [inline] >>   print_report+0xcd/0x630 mm/kasan/report.c:482 >>   kasan_report+0xe0/0x110 mm/kasan/report.c:595 >>   __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32 >>   __list_add_valid include/linux/list.h:88 [inline] >>   __list_add include/linux/list.h:150 [inline] >>   list_add_tail include/linux/list.h:183 [inline] >>   disk_add_events+0x90/0x170 block/disk-events.c:463 >>   add_disk_final block/genhd.c:427 [inline] >>   add_disk_fwnode+0x3c8/0x5d0 block/genhd.c:610 >>   add_disk include/linux/blkdev.h:773 [inline] >>   md_alloc+0x3c2/0x1080 drivers/md/md.c:5981 >>   md_alloc_and_put drivers/md/md.c:6016 [inline] >>   md_probe drivers/md/md.c:6029 [inline] >>   md_probe+0x6e/0xd0 drivers/md/md.c:6024 >>   blk_probe_dev+0x116/0x1a0 block/genhd.c:884 >>   blk_request_module+0x16/0xb0 block/genhd.c:897 >>   blkdev_get_no_open+0x9b/0x100 block/bdev.c:825 >>   blkdev_open+0x141/0x3f0 block/fops.c:684 >>   do_dentry_open+0x744/0x1c10 fs/open.c:965 >>   vfs_open+0x82/0x3f0 fs/open.c:1095 >>   do_open fs/namei.c:3887 [inline] >>   path_openat+0x1de4/0x2cb0 fs/namei.c:4046 >>   do_filp_open+0x20b/0x470 fs/namei.c:4073 >>   do_sys_openat2+0x11b/0x1d0 fs/open.c:1435 >>   do_sys_open fs/open.c:1450 [inline] >>   __do_sys_openat fs/open.c:1466 [inline] >>   __se_sys_openat fs/open.c:1461 [inline] >>   __x64_sys_openat+0x174/0x210 fs/open.c:1461 >>   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>   do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 >>   entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7f4ea558e9a9 >> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 >> RSP: 002b:00007f4ea645e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 >> RAX: ffffffffffffffda RBX: 00007f4ea57b6080 RCX: 00007f4ea558e9a9 >> RDX: 0000000000000000 RSI: 0000200000000a80 RDI: ffffffffffffff9c >> RBP: 00007f4ea5610d69 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 >> R13: 0000000000000000 R14: 00007f4ea57b6080 R15: 00007fff25d53038 >>   >> >> Allocated by task 9822: >>   kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 >>   kasan_save_track+0x14/0x30 mm/kasan/common.c:68 >>   poison_kmalloc_redzone mm/kasan/common.c:377 [inline] >>   __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 >>   kmalloc_noprof include/linux/slab.h:905 [inline] >>   kzalloc_noprof include/linux/slab.h:1039 [inline] >>   disk_alloc_events+0xf0/0x3f0 block/disk-events.c:439 >>   __add_disk+0x475/0xf00 block/genhd.c:500 >>   add_disk_fwnode+0x3f8/0x5d0 block/genhd.c:601 >>   add_disk include/linux/blkdev.h:773 [inline] >>   md_alloc+0x3c2/0x1080 drivers/md/md.c:5981 >>   md_alloc_and_put drivers/md/md.c:6016 [inline] >>   md_probe drivers/md/md.c:6029 [inline] >>   md_probe+0x6e/0xd0 drivers/md/md.c:6024 >>   blk_probe_dev+0x116/0x1a0 block/genhd.c:884 >>   blk_request_module+0x16/0xb0 block/genhd.c:897 >>   blkdev_get_no_open+0x9b/0x100 block/bdev.c:825 >>   blkdev_open+0x141/0x3f0 block/fops.c:684 >>   do_dentry_open+0x744/0x1c10 fs/open.c:965 >>   vfs_open+0x82/0x3f0 fs/open.c:1095 >>   do_open fs/namei.c:3887 [inline] >>   path_openat+0x1de4/0x2cb0 fs/namei.c:4046 >>   do_filp_open+0x20b/0x470 fs/namei.c:4073 >>   do_sys_openat2+0x11b/0x1d0 fs/open.c:1435 >>   do_sys_open fs/open.c:1450 [inline] >>   __do_sys_openat fs/open.c:1466 [inline] >>   __se_sys_openat fs/open.c:1461 [inline] >>   __x64_sys_openat+0x174/0x210 fs/open.c:1461 >>   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >>   do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 >>   entry_SYSCALL_64_after_hwframe+0x77/0x7f >> >> Freed by task 9817: >>   kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 >>   kasan_save_track+0x14/0x30 mm/kasan/common.c:68 >>   kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 >>   poison_slab_object mm/kasan/common.c:247 [inline] >>   __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 >>   kasan_slab_free include/linux/kasan.h:233 [inline] >>   slab_free_hook mm/slub.c:2381 [inline] >>   slab_free mm/slub.c:4643 [inline] >>   kfree+0x2b4/0x4d0 mm/slub.c:4842 >>   disk_release+0x161/0x410 block/genhd.c:1301 >>   device_release+0xa1/0x240 drivers/base/core.c:2568 >>   kobject_cleanup lib/kobject.c:689 [inline] >>   kobject_release lib/kobject.c:720 [inline] >>   kref_put include/linux/kref.h:65 [inline] >>   kobject_put+0x1e7/0x5a0 lib/kobject.c:737 >>   put_device+0x1f/0x30 drivers/base/core.c:3800 >>   blkdev_release+0x15/0x20 block/fops.c:699 >>   __fput+0x402/0xb70 fs/file_table.c:468 >>   task_work_run+0x14d/0x240 kernel/task_work.c:227 >>   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] >>   exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114 >>   exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] >>   syscall_exit_to_user_mode_work include/linux/entry-common.h:414 >> [inline] >>   syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] >>   do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 >>   entry_SYSCALL_64_after_hwframe+0x77/0x7f >> >> The buggy address belongs to the object at ffff888036fa1400 >>   which belongs to the cache kmalloc-512 of size 512 >> The buggy address is located 0 bytes inside of >>   freed 512-byte region [ffff888036fa1400, ffff888036fa1600) >> >> The buggy address belongs to the physical page: >> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 >> pfn:0x36fa0 >> 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 ffff88801b842c80 dead000000000100 dead000000000122 >> raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 >> head: 00fff00000000040 ffff88801b842c80 dead000000000100 dead000000000122 >> head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 >> head: 00fff00000000002 ffffea0000dbe801 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 2, tgid 2 (kthreadd), ts 71482349709, free_ts 68765218476 >>   set_page_owner include/linux/page_owner.h:32 [inline] >>   post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 >>   prep_new_page mm/page_alloc.c:1712 [inline] >>   get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 >>   __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 >>   alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 >>   alloc_slab_page mm/slub.c:2451 [inline] >>   allocate_slab mm/slub.c:2619 [inline] >>   new_slab+0x23b/0x330 mm/slub.c:2673 >>   ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 >>   __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 >>   __slab_alloc_node mm/slub.c:4024 [inline] >>   slab_alloc_node mm/slub.c:4185 [inline] >>   __kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354 >>   kmalloc_noprof include/linux/slab.h:905 [inline] >>   kzalloc_noprof include/linux/slab.h:1039 [inline] >>   set_kthread_struct+0xcb/0x380 kernel/kthread.c:126 >>   copy_process+0x3107/0x7650 kernel/fork.c:2097 >>   kernel_clone+0xfc/0x960 kernel/fork.c:2599 >>   kernel_thread+0xd4/0x120 kernel/fork.c:2661 >>   create_kthread kernel/kthread.c:487 [inline] >>   kthreadd+0x503/0x800 kernel/kthread.c:847 >>   ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 >>   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 >> page last free pid 6016 tgid 6016 stack trace: >>   reset_page_owner include/linux/page_owner.h:25 [inline] >>   free_pages_prepare mm/page_alloc.c:1248 [inline] >>   __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 >>   vfree+0x1fd/0xb50 mm/vmalloc.c:3434 >>   kcov_put kernel/kcov.c:439 [inline] >>   kcov_put kernel/kcov.c:435 [inline] >>   kcov_close+0x34/0x60 kernel/kcov.c:535 >>   __fput+0x402/0xb70 fs/file_table.c:468 >>   task_work_run+0x14d/0x240 kernel/task_work.c:227 >>   exit_task_work include/linux/task_work.h:40 [inline] >>   do_exit+0x86c/0x2bd0 kernel/exit.c:964 >>   do_group_exit+0xd3/0x2a0 kernel/exit.c:1105 >>   get_signal+0x2673/0x26d0 kernel/signal.c:3034 >>   arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 >>   exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:111 >>   exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] >>   syscall_exit_to_user_mode_work include/linux/entry-common.h:414 >> [inline] >>   syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] >>   do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 >>   entry_SYSCALL_64_after_hwframe+0x77/0x7f >> >> Memory state around the buggy address: >>   ffff888036fa1300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >>   ffff888036fa1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >>> ffff888036fa1400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >>                     ^ >>   ffff888036fa1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >>   ffff888036fa1500: 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 syzbot to run the reproducer, reply with: >> #syz test: git://repo/address.git branch-or-commit-hash >> If you attach or paste a git patch, syzbot will apply it before testing. >> >> 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 >> >> >> . >> > > . >