KMSAN: uninit-value in io_fallback_req

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	general protection fault in io_issue_sqe	C	done	unreliable	46	9d22h	267d	0/22	upstream: reported C repro on 2021/09/02 17:34
upstream	KASAN: use-after-free Read in tctx_task_work (2)	C	unreliable		333	4d07h	281d	0/22	upstream: reported C repro on 2021/08/19 08:10

similar bugs (2):

upstream

general protection fault in io_issue_sqe

done

unreliable

9d22h

267d

0/22

upstream: reported C repro on 2021/09/02 17:34

upstream

KASAN: use-after-free Read in tctx_task_work (2)

unreliable

333

4d07h

281d

0/22

upstream: reported C repro on 2021/08/19 08:10

=====================================================
BUG: KMSAN: uninit-value in io_fallback_req_func+0x218/0x5f7 fs/io_uring.c:1399
 io_fallback_req_func+0x218/0x5f7 fs/io_uring.c:1399
 process_one_work+0xdb6/0x1820 kernel/workqueue.c:2307
 worker_thread+0x10b3/0x21e0 kernel/workqueue.c:2454
 kthread+0x3c7/0x500 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:737 [inline]
 kmem_cache_alloc_bulk+0xe98/0x1530 mm/slub.c:3744
 __io_alloc_req_refill+0x482/0x867 fs/io_uring.c:2072
 io_alloc_req_refill fs/io_uring.c:2098 [inline]
 io_submit_sqes+0x7d4/0x1a00 fs/io_uring.c:7441
 __do_sys_io_uring_enter fs/io_uring.c:10162 [inline]
 __se_sys_io_uring_enter+0x62f/0x23a0 fs/io_uring.c:10104
 __x64_sys_io_uring_enter+0x19d/0x200 fs/io_uring.c:10104
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

CPU: 0 PID: 3552 Comm: kworker/0:4 Not tainted 5.17.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Comput

Crashes (8):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kmsan-gce	2022/04/22 08:53	https://github.com/google/kmsan.git master	33d9269ef6e0	2738b391	.config	log	report	syz	C		KMSAN: uninit-value in io_fallback_req_func
ci-upstream-kmsan-gce	2022/04/22 07:31	https://github.com/google/kmsan.git master	33d9269ef6e0	2738b391	.config	log	report			info	KMSAN: uninit-value in io_fallback_req_func
ci-upstream-kmsan-gce	2022/03/27 10:12	https://github.com/google/kmsan.git master	97c7732c2bb6	89bc8608	.config	log	report			info	KMSAN: uninit-value in io_fallback_req_func
ci-upstream-kmsan-gce	2022/01/02 05:34	https://github.com/google/kmsan.git master	81c325bbf94e	e1768e9c	.config	log	report			info	KMSAN: uninit-value in io_fallback_req_func
ci-upstream-kmsan-gce	2021/11/16 12:44	https://github.com/google/kmsan.git master	386004877847	600426bd	.config	log	report			info	KMSAN: uninit-value in io_fallback_req_func
ci-upstream-kmsan-gce	2021/10/29 18:14	https://github.com/google/kmsan.git master	45859661869b	2353a3ec	.config	log	report			info	KMSAN: uninit-value in io_fallback_req_func
ci-upstream-kmsan-gce	2021/10/28 21:12	https://github.com/google/kmsan.git master	1e128e535256	be531bb4	.config	log	report			info	KMSAN: uninit-value in io_fallback_req_func
ci-upstream-kmsan-gce	2021/10/12 11:58	https://github.com/google/kmsan.git master	c7f84f4e1147	838e7e2c	.config	log	report			info	KMSAN: uninit-value in io_fallback_req_func

Crashes (8):