Re: [syzbot] [io-uring?] KMSAN: uninit-value in io_sendrecv_fail
From: syzbot
Date: Sat Mar 16 2024 - 09:37:16 EST
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in io_sendrecv_fail
=====================================================
BUG: KMSAN: uninit-value in io_sendrecv_fail+0x91/0x1e0 io_uring/net.c:1341
io_sendrecv_fail+0x91/0x1e0 io_uring/net.c:1341
io_req_defer_failed+0x3bd/0x610 io_uring/io_uring.c:1050
io_queue_sqe_fallback+0x1e3/0x280 io_uring/io_uring.c:2126
io_submit_fail_init+0x4e1/0x790 io_uring/io_uring.c:2304
io_submit_sqes+0x19cd/0x2fb0 io_uring/io_uring.c:2480
__do_sys_io_uring_enter io_uring/io_uring.c:3656 [inline]
__se_sys_io_uring_enter+0x409/0x4390 io_uring/io_uring.c:3591
__x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3591
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Uninit was created at:
__alloc_pages+0x9a6/0xe00 mm/page_alloc.c:4592
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page mm/slub.c:2190 [inline]
allocate_slab mm/slub.c:2354 [inline]
new_slab+0x2d7/0x1400 mm/slub.c:2407
___slab_alloc+0x16b5/0x3970 mm/slub.c:3540
__kmem_cache_alloc_bulk mm/slub.c:4574 [inline]
kmem_cache_alloc_bulk+0x52a/0x1440 mm/slub.c:4648
__io_alloc_req_refill+0x248/0x780 io_uring/io_uring.c:1101
io_alloc_req io_uring/io_uring.h:405 [inline]
io_submit_sqes+0xaa1/0x2fb0 io_uring/io_uring.c:2469
__do_sys_io_uring_enter io_uring/io_uring.c:3656 [inline]
__se_sys_io_uring_enter+0x409/0x4390 io_uring/io_uring.c:3591
__x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3591
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
CPU: 0 PID: 5482 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-00721-g6c677dd4eac2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
=====================================================
Tested on:
commit: 6c677dd4 io_uring/net: ensure async prep handlers alwa..
git tree: git://git.kernel.dk/linux.git io_uring-6.9
console output: https://syzkaller.appspot.com/x/log.txt?x=17f26711180000
kernel config: https://syzkaller.appspot.com/x/.config?x=a271c5dca0ff14df
dashboard link: https://syzkaller.appspot.com/bug?extid=f8e9a371388aa62ecab4
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.