From: syzbot <syzbot+3c93637d7648c24e1fd0@syzkaller.appspotmail.com>
To: axboe@kernel.dk, io-uring@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [io-uring?] memory leak in iovec_from_user (2)
Date: Mon, 10 Nov 2025 10:09:29 -0800 [thread overview]
Message-ID: <69122a59.a70a0220.22f260.00fd.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 4a0c9b339199 Merge tag 'probes-fixes-v6.18-rc4' of git://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12af5342580000
kernel config: https://syzkaller.appspot.com/x/.config?x=cb128cd5cb439809
dashboard link: https://syzkaller.appspot.com/bug?extid=3c93637d7648c24e1fd0
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=16af5342580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13664412580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bfd02a09ef4d/disk-4a0c9b33.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ed9a1334f973/vmlinux-4a0c9b33.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e503329437ee/bzImage-4a0c9b33.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3c93637d7648c24e1fd0@syzkaller.appspotmail.com
BUG: memory leak
unreferenced object 0xffff88812638cc20 (size 32):
comm "syz.0.17", pid 6104, jiffies 4294942640
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:4975 [inline]
slab_alloc_node mm/slub.c:5280 [inline]
__do_kmalloc_node mm/slub.c:5641 [inline]
__kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
kmalloc_array_noprof include/linux/slab.h:1003 [inline]
iovec_from_user lib/iov_iter.c:1309 [inline]
iovec_from_user+0x108/0x140 lib/iov_iter.c:1292
__import_iovec+0x71/0x350 lib/iov_iter.c:1363
io_import_vec io_uring/rw.c:99 [inline]
__io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
io_import_rw_buffer io_uring/rw.c:139 [inline]
io_rw_do_import io_uring/rw.c:314 [inline]
io_prep_rw+0xb5/0x120 io_uring/rw.c:326
io_prep_rwv io_uring/rw.c:344 [inline]
io_prep_readv+0x20/0x80 io_uring/rw.c:359
io_init_req io_uring/io_uring.c:2248 [inline]
io_submit_sqe io_uring/io_uring.c:2295 [inline]
io_submit_sqes+0x354/0xe80 io_uring/io_uring.c:2447
__do_sys_io_uring_enter+0x83f/0xcf0 io_uring/io_uring.c:3514
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 0xffff88812638cc40 (size 32):
comm "syz.0.17", pid 6104, jiffies 4294942640
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:4975 [inline]
slab_alloc_node mm/slub.c:5280 [inline]
__do_kmalloc_node mm/slub.c:5641 [inline]
__kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
kmalloc_array_noprof include/linux/slab.h:1003 [inline]
iovec_from_user lib/iov_iter.c:1309 [inline]
iovec_from_user+0x108/0x140 lib/iov_iter.c:1292
__import_iovec+0x71/0x350 lib/iov_iter.c:1363
io_import_vec io_uring/rw.c:99 [inline]
__io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
io_import_rw_buffer io_uring/rw.c:139 [inline]
io_rw_do_import io_uring/rw.c:314 [inline]
io_prep_rw+0xb5/0x120 io_uring/rw.c:326
io_prep_rwv io_uring/rw.c:344 [inline]
io_prep_readv+0x20/0x80 io_uring/rw.c:359
io_init_req io_uring/io_uring.c:2248 [inline]
io_submit_sqe io_uring/io_uring.c:2295 [inline]
io_submit_sqes+0x354/0xe80 io_uring/io_uring.c:2447
__do_sys_io_uring_enter+0x83f/0xcf0 io_uring/io_uring.c:3514
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 0xffff88812638cc60 (size 32):
comm "syz.0.17", pid 6104, jiffies 4294942640
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:4975 [inline]
slab_alloc_node mm/slub.c:5280 [inline]
__do_kmalloc_node mm/slub.c:5641 [inline]
__kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
kmalloc_array_noprof include/linux/slab.h:1003 [inline]
iovec_from_user lib/iov_iter.c:1309 [inline]
iovec_from_user+0x108/0x140 lib/iov_iter.c:1292
__import_iovec+0x71/0x350 lib/iov_iter.c:1363
io_import_vec io_uring/rw.c:99 [inline]
__io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
io_import_rw_buffer io_uring/rw.c:139 [inline]
io_rw_do_import io_uring/rw.c:314 [inline]
io_prep_rw+0xb5/0x120 io_uring/rw.c:326
io_prep_rwv io_uring/rw.c:344 [inline]
io_prep_readv+0x20/0x80 io_uring/rw.c:359
io_init_req io_uring/io_uring.c:2248 [inline]
io_submit_sqe io_uring/io_uring.c:2295 [inline]
io_submit_sqes+0x354/0xe80 io_uring/io_uring.c:2447
__do_sys_io_uring_enter+0x83f/0xcf0 io_uring/io_uring.c:3514
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 0xffff88812638cc80 (size 32):
comm "syz.0.17", pid 6104, jiffies 4294942640
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:4975 [inline]
slab_alloc_node mm/slub.c:5280 [inline]
__do_kmalloc_node mm/slub.c:5641 [inline]
__kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
kmalloc_array_noprof include/linux/slab.h:1003 [inline]
iovec_from_user lib/iov_iter.c:1309 [inline]
iovec_from_user+0x108/0x140 lib/iov_iter.c:1292
__import_iovec+0x71/0x350 lib/iov_iter.c:1363
io_import_vec io_uring/rw.c:99 [inline]
__io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
io_import_rw_buffer io_uring/rw.c:139 [inline]
io_rw_do_import io_uring/rw.c:314 [inline]
io_prep_rw+0xb5/0x120 io_uring/rw.c:326
io_prep_rwv io_uring/rw.c:344 [inline]
io_prep_readv+0x20/0x80 io_uring/rw.c:359
io_init_req io_uring/io_uring.c:2248 [inline]
io_submit_sqe io_uring/io_uring.c:2295 [inline]
io_submit_sqes+0x354/0xe80 io_uring/io_uring.c:2447
__do_sys_io_uring_enter+0x83f/0xcf0 io_uring/io_uring.c:3514
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 0xffff88812638cca0 (size 32):
comm "syz.0.17", pid 6104, jiffies 4294942640
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:4975 [inline]
slab_alloc_node mm/slub.c:5280 [inline]
__do_kmalloc_node mm/slub.c:5641 [inline]
__kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
kmalloc_array_noprof include/linux/slab.h:1003 [inline]
iovec_from_user lib/iov_iter.c:1309 [inline]
iovec_from_user+0x108/0x140 lib/iov_iter.c:1292
__import_iovec+0x71/0x350 lib/iov_iter.c:1363
io_import_vec io_uring/rw.c:99 [inline]
__io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
io_import_rw_buffer io_uring/rw.c:139 [inline]
io_rw_do_import io_uring/rw.c:314 [inline]
io_prep_rw+0xb5/0x120 io_uring/rw.c:326
io_prep_rwv io_uring/rw.c:344 [inline]
io_prep_readv+0x20/0x80 io_uring/rw.c:359
io_init_req io_uring/io_uring.c:2248 [inline]
io_submit_sqe io_uring/io_uring.c:2295 [inline]
io_submit_sqes+0x354/0xe80 io_uring/io_uring.c:2447
__do_sys_io_uring_enter+0x83f/0xcf0 io_uring/io_uring.c:3514
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 0xffff88812638ccc0 (size 32):
comm "syz.0.17", pid 6104, jiffies 4294942640
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:4975 [inline]
slab_alloc_node mm/slub.c:5280 [inline]
__do_kmalloc_node mm/slub.c:5641 [inline]
__kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5654
kmalloc_noprof include/linux/slab.h:961 [inline]
kmalloc_array_noprof include/linux/slab.h:1003 [inline]
iovec_from_user lib/iov_iter.c:1309 [inline]
iovec_from_user+0x108/0x140 lib/iov_iter.c:1292
__import_iovec+0x71/0x350 lib/iov_iter.c:1363
io_import_vec io_uring/rw.c:99 [inline]
__io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120
io_import_rw_buffer io_uring/rw.c:139 [inline]
io_rw_do_import io_uring/rw.c:314 [inline]
io_prep_rw+0xb5/0x120 io_uring/rw.c:326
io_prep_rwv io_uring/rw.c:344 [inline]
io_prep_readv+0x20/0x80 io_uring/rw.c:359
io_init_req io_uring/io_uring.c:2248 [inline]
io_submit_sqe io_uring/io_uring.c:2295 [inline]
io_submit_sqes+0x354/0xe80 io_uring/io_uring.c:2447
__do_sys_io_uring_enter+0x83f/0xcf0 io_uring/io_uring.c:3514
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
---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
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next reply other threads:[~2025-11-10 18:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-10 18:09 syzbot [this message]
2025-11-10 20:37 ` [syzbot] [io-uring?] memory leak in iovec_from_user (2) Jens Axboe
2025-11-10 21:06 ` Jens Axboe
2025-11-10 21:34 ` Jens Axboe
2025-11-10 21:55 ` syzbot
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