Message-ID: <6931abe7.a70a0220.2ea503.00e0.GAE@google.com>
Date: Thu, 04 Dec 2025 07:42:31 -0800
From: syzbot <syzbot+527a7e48a3d3d315d862@...kaller.appspotmail.com>
To: axboe@...nel.dk, jack@...e.com, linux-block@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [block?] [udf?] memory leak in __blkdev_issue_zero_pages

Hello,

syzbot found the following issue on:

HEAD commit:    6bda50f4333f Merge tag 'mips-fixes_6.18_2' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17ad8192580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f30cc590c4f6da44
dashboard link: https://syzkaller.appspot.com/bug?extid=527a7e48a3d3d315d862
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10b27cb4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/864951cecf67/disk-6bda50f4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4692a21b76e7/vmlinux-6bda50f4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a2898beb8301/bzImage-6bda50f4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/384c8ab49dd6/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+527a7e48a3d3d315d862@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810dd11b00 (size 200):
  comm "syz.3.32", pid 6189, jiffies 4294946488
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 80 70 01 41 81 88 ff ff  .........p.A....
    01 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00  ................
  backtrace (crc fe2a8999):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    mempool_alloc_noprof+0xa0/0x200 mm/mempool.c:426
    bio_alloc_bioset+0x398/0x7b0 block/bio.c:558
    bio_alloc include/linux/bio.h:372 [inline]
    __blkdev_issue_zero_pages+0x109/0x2f0 block/blk-lib.c:205
    blkdev_issue_zero_pages block/blk-lib.c:239 [inline]
    blkdev_issue_zeroout+0x1dc/0x490 block/blk-lib.c:326
    blk_ioctl_zeroout block/ioctl.c:250 [inline]
    blkdev_common_ioctl+0xb40/0x1180 block/ioctl.c:580
    blkdev_ioctl+0x128/0x380 block/ioctl.c:699
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888108a3d000 (size 4096):
  comm "syz.3.32", pid 6189, jiffies 4294946488
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    kmem_cache_alloc_noprof+0x397/0x5a0 mm/slub.c:5295
    mempool_alloc_noprof+0xa0/0x200 mm/mempool.c:426
    bvec_alloc+0x9d/0x130 block/bio.c:210
    bio_alloc_bioset+0x3cb/0x7b0 block/bio.c:573
    bio_alloc include/linux/bio.h:372 [inline]
    __blkdev_issue_zero_pages+0x109/0x2f0 block/blk-lib.c:205
    blkdev_issue_zero_pages block/blk-lib.c:239 [inline]
    blkdev_issue_zeroout+0x1dc/0x490 block/blk-lib.c:326
    blk_ioctl_zeroout block/ioctl.c:250 [inline]
    blkdev_common_ioctl+0xb40/0x1180 block/ioctl.c:580
    blkdev_ioctl+0x128/0x380 block/ioctl.c:699
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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