linux-kernel - Re: [6.2][regression] after commit 947a629988f191807d2d22ba63ae18259bb645c5 btrfs volume periodical forced switch to readonly after a lot of disk writes

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Message-ID: <CABXGCsOgy0N_TLEadgacMBQLuU5xBe-hmoRvv4h=q-M5PcPvEg@mail.gmail.com>
Date:   Tue, 27 Dec 2022 15:19:08 +0500
From:   Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To:     Qu Wenruo <quwenruo.btrfs@....com>
Cc:     wqu@...e.com, dsterba@...e.com,
        Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: [6.2][regression] after commit 947a629988f191807d2d22ba63ae18259bb645c5
 btrfs volume periodical forced switch to readonly after a lot of disk writes

On Tue, Dec 27, 2022 at 10:13 AM Qu Wenruo <quwenruo.btrfs@....com> wrote:
> The result doesn't make sense...
>
> A lot of read_block_for_search() and btrfs_read_node_slot() are
> triggering the warning.
>
> But inside both functions, we have just set the numbers before the call:
>
> In read_block_for_search() we got:
>
>          check.has_first_key = true;
>          check.level = parent_level - 1;
>          check.transid = gen;
>          check.owner_root = root->root_key.objectid;
>
> Thus at least check.has_first_key is always true, and the WARN_ON()
> should never get triggered.
> The same applies to btrfs_read_node_slot().
>
> It looks like something involved in memory barrier.
>
> Anyway, the latest debug patch has extra mb to be sure.
>
> And despite the possible fix, could you provide extra info of your
> build? Include:
Kernel log is attached. All answers are below.

> - Hardware (mostly CPU and RAM spec)
This is laptop ASUS ROG Strix G15 Advantage Edition G513QY-HQ007
with CPU AMD Ryzen 9 5900HX and GPU Radeon RX 6800M
I upgraded RAM to Crucial CT32G4SFD832A DDR4 - 32GB x 2 (64GB) and SSD
to Seagate FireCuda 530 ZP4000GM3A013 4TB x 2 (8TB)
https://linux-hardware.org/?probe=0e063e5fd5

> - Toolchain used to compile the kernel (include compiler and its version)
$ rpm -q binutils
binutils-2.39-6.fc38.x86_64

$ ld --version
GNU ld version 2.39-6.fc38

$ rpm -q gcc
gcc-12.2.1-4.fc38.x86_64

$ gcc --version
gcc (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4)

$ rpm -q make
make-4.3-11.fc37.x86_64

$ make --version
GNU Make 4.3

> - Kernel config
Attached with debug logs.

-- 
Best Regards,
Mike Gavrilov.

View attachment "btrfs-issue-dmesg-debug4.txt" of type "text/plain" (1244604 bytes)

Download attachment ".config" of type "application/octet-stream" (256374 bytes)