linux-kernel - Re: [io-uring] WARNING in io_fill_cqe_req

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Date: Wed, 12 Jun 2024 09:10:28 +0200
From: chase xd <sl1589472800@...il.com>
To: Pavel Begunkov <asml.silence@...il.com>, Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [io-uring] WARNING in io_fill_cqe_req_aux

Sorry now I'm also a bit confused by the branch choosing. I checked
out branch "for-6.9/io_uring" and started testing on that branch. I
assume that was the latest version of io_uring at that time, even now
I check out that branch and the bug still exists. How should I know
whether the branch will be merged, and which branch do you think I
should test on? Thanks.

Pavel Begunkov <asml.silence@...il.com> 于2024年6月12日周三 03:11写道：
>
> On 6/7/24 18:07, chase xd wrote:
> > Dear Linux kernel maintainers,
> >
> > Syzkaller reports this previously unknown bug on Linux
> > 6.8.0-rc3-00043-ga69d20885494-dirty #4. Seems like the bug was
> > silently or unintendedly fixed in the latest version.
>
> That branch you're using is confusing, apart from being
> dirty and rc3, apparently it has never been merged. The
> patch the test fails on looks different upstream:
>
>
> commit 902ce82c2aa130bea5e3feca2d4ae62781865da7
> Author: Pavel Begunkov <asml.silence@...il.com>
> Date:   Mon Mar 18 22:00:32 2024 +0000
>
>      io_uring: get rid of intermediate aux cqe caches
>
>
> It reproduces with your version but not with anything
> upstream
>
>
> > ```
> > Syzkaller hit 'WARNING in io_fill_cqe_req_aux' bug.
> >
> > ------------[ cut here ]------------
> > WARNING: CPU: 7 PID: 8369 at io_uring/io_uring.h:132
> > io_lockdep_assert_cq_locked+0x2c7/0x340 io_uring/io_uring.h:132
> > Modules linked in:
> > CPU: 7 PID: 8369 Comm: syz-executor263 Not tainted
> > 6.8.0-rc3-00043-ga69d20885494-dirty #4
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> > RIP: 0010:io_lockdep_assert_cq_locked+0x2c7/0x340 io_uring/io_uring.h:132
> > Code: 48 8d bb 98 03 00 00 be ff ff ff ff e8 52 45 4b 06 31 ff 89 c3
> > 89 c6 e8 b7 e2 2d fd 85 db 0f 85 d5 fe ff ff e8 0a e7 2d fd 90 <0f> 0b
> > 90 e9 c7 fe ff ff e8 fc e6 2d fd e8 c7 38 fa fc 48 85 c0 0f
> > RSP: 0018:ffffc90012af79a8 EFLAGS: 00010293
> > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff845cf059
> > RDX: ffff8880252ea440 RSI: ffffffff845cf066 RDI: 0000000000000005
> > RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
> > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
> > FS:  00005555570e13c0(0000) GS:ffff88823bd80000(0000) knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00007f1bdbcae020 CR3: 0000000022624000 CR4: 0000000000750ef0
> > PKRU: 55555554
> > Call Trace:
> >   <TASK>
> >   io_fill_cqe_req_aux+0xd6/0x1f0 io_uring/io_uring.c:925
> >   io_poll_check_events io_uring/poll.c:325 [inline]
> >   io_poll_task_func+0x16f/0x1000 io_uring/poll.c:357
> >   io_handle_tw_list+0x172/0x560 io_uring/io_uring.c:1154
> >   tctx_task_work_run+0xaa/0x330 io_uring/io_uring.c:1226
> >   tctx_task_work+0x7b/0xd0 io_uring/io_uring.c:1244
> >   task_work_run+0x16d/0x260 kernel/task_work.c:180
> >   get_signal+0x1cb/0x25a0 kernel/signal.c:2669
> >   arch_do_signal_or_restart+0x81/0x7e0 arch/x86/kernel/signal.c:310
> >   exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
> >   exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
> >   __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
> >   syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212
> >   do_syscall_64+0xe5/0x270 arch/x86/entry/common.c:89
> >   entry_SYSCALL_64_after_hwframe+0x6f/0x77
> > RIP: 0033:0x7f1bdbc2d88d
> > Code: c3 e8 a7 1f 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 89 f8 48
> > 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
> > 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> > RSP: 002b:00007ffd12f6fa18 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
> > RAX: 0000000000000001 RBX: 000000000000220b RCX: 00007f1bdbc2d88d
> > RDX: 0000000000000000 RSI: 0000000000005012 RDI: 0000000000000003
> > RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
> > R13: 431bde82d7b634db R14: 00007f1bdbcaa4f0 R15: 0000000000000001
> >   </TASK>
> >
> >
> > Syzkaller reproducer:
> > # {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1
> > Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false
> > NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false
> > KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false
> > Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false
> > HandleSegv:false Repro:false Trace:false LegacyOptions:{Collide:false
> > Fault:false FaultCall:0 FaultNth:0}}
> > r0 = syz_io_uring_setup(0x220b, &(0x7f0000000000)={0x0, 0x63db,
> > 0x10000, 0x800}, &(0x7f0000000080)=<r1=>0x0,
> > &(0x7f0000000200)=<r2=>0x0)
> > r3 = socket$inet(0x2, 0x1, 0x0)
> > syz_io_uring_submit(r1, r2,
> > &(0x7f0000000a80)=@...ING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r3, 0x0,
> > 0x0, 0x1})
> > io_uring_enter(r0, 0x5012, 0x0, 0x0, 0x0, 0x0)
> > ```
> >
> > crepro is in the attachment.
> >
> > Best Regards
> > Xdchase
>
> --
> Pavel Begunkov