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Message-ID: <69122a59.a70a0220.22f260.00fd.GAE@google.com>
Date: Mon, 10 Nov 2025 10:09:29 -0800
From: syzbot <syzbot+3c93637d7648c24e1fd0@...kaller.appspotmail.com>
To: axboe@...nel.dk, io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [io-uring?] memory leak in iovec_from_user (2)
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@...kaller.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.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.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
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