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KCSAN: data-race in io_submit_sqes / io_uring_poll (8)

Status: auto-obsoleted due to no activity on 2024/10/08 01:12
Subsystems: io-uring
[Documentation on labels]
Reported-by: syzbot+6a4002279343ac44c448@syzkaller.appspotmail.com
First crash: 111d, last: 38d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [io-uring?] KCSAN: data-race in io_submit_sqes / io_uring_poll (8) 0 (1) 2024/06/22 08:42
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in io_submit_sqes / io_uring_poll (2) fs 1 1375d 1375d 0/28 auto-closed as invalid on 2021/02/08 06:39
upstream KCSAN: data-race in io_submit_sqes / io_uring_poll (3) fs 55 1053d 1131d 0/28 auto-closed as invalid on 2021/12/27 08:47
upstream KCSAN: data-race in io_submit_sqes / io_uring_poll (7) io-uring 1 177d 177d 0/28 auto-obsoleted due to no activity on 2024/05/21 11:08
upstream KCSAN: data-race in io_submit_sqes / io_uring_poll fs 2 1477d 1503d 0/28 auto-closed as invalid on 2020/10/29 16:22
upstream KCSAN: data-race in io_submit_sqes / io_uring_poll (5) io-uring 21 535d 723d 0/28 auto-obsoleted due to no activity on 2023/05/30 00:18
upstream KCSAN: data-race in io_submit_sqes / io_uring_poll (6) io-uring 1 334d 305d 0/28 auto-obsoleted due to no activity on 2023/12/25 00:08
upstream KCSAN: data-race in io_submit_sqes / io_uring_poll (4) io-uring 123 775d 941d 0/28 auto-obsoleted due to no activity on 2022/10/01 12:19

Sample crash report:
==================================================================
BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff888114970870 of 4 bytes by task 13361 on cpu 1:
 io_get_sqe io_uring/io_uring.c:2235 [inline]
 io_submit_sqes+0x23f/0x1080 io_uring/io_uring.c:2286
 __do_sys_io_uring_enter io_uring/io_uring.c:3210 [inline]
 __se_sys_io_uring_enter+0x1c6/0x15a0 io_uring/io_uring.c:3147
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3147
 x64_sys_call+0x2567/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888114970870 of 4 bytes by task 13362 on cpu 0:
 io_sqring_full io_uring/io_uring.h:282 [inline]
 io_uring_poll+0xcf/0x190 io_uring/io_uring.c:2701
 vfs_poll include/linux/poll.h:84 [inline]
 __io_arm_poll_handler+0x229/0xf30 io_uring/poll.c:623
 io_arm_poll_handler+0x433/0x5f0 io_uring/poll.c:757
 io_wq_submit_work+0x512/0x600 io_uring/io_uring.c:1844
 io_worker_handle_work+0x486/0x9d0 io_uring/io-wq.c:600
 io_wq_worker+0x286/0x820 io_uring/io-wq.c:654
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00003f3f -> 0x00003f40

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13362 Comm: iou-wrk-13361 Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/03 01:11 upstream 67784a74e258 8045124c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/09/03 01:10 upstream 67784a74e258 8045124c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/09/03 01:10 upstream 67784a74e258 8045124c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/09/03 01:10 upstream 67784a74e258 8045124c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/09/02 01:04 upstream c9f016e72b5c 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/09/01 11:10 upstream 431c1646e1f8 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/08/31 22:03 upstream e8784b0aef62 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/08/31 13:59 upstream 1934261d8974 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/08/31 13:59 upstream 1934261d8974 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/08/31 13:58 upstream 1934261d8974 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/08/02 13:17 upstream c0ecd6388360 1e9c4cf3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/08/02 13:17 upstream c0ecd6388360 1e9c4cf3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/07/22 10:51 upstream 933069701c1b df655b64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/07/17 00:04 upstream d67978318827 b66b37bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/07/15 17:42 upstream 5e0497553643 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/07/08 19:41 upstream 256abd8e550c cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/07/08 08:04 upstream 256abd8e550c 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
2024/06/22 00:06 upstream 66cc544fd75c edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in io_submit_sqes / io_uring_poll
* Struck through repros no longer work on HEAD.