linux-kernel - Re: [GIT PULL] Please pull powerpc/linux.git powerpc-6.1-1 tag

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Message-ID: <20221012164452.GA2990467@roeck-us.net>
Date:   Wed, 12 Oct 2022 09:44:52 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        ajd@...ux.ibm.com, aneesh.kumar@...ux.ibm.com,
        atrajeev@...ux.vnet.ibm.com, christophe.leroy@...roup.eu,
        cuigaosheng1@...wei.com, david@...hat.com, farosas@...ux.ibm.com,
        geoff@...radead.org, gustavoars@...nel.org, haren@...ux.ibm.com,
        hbathini@...ux.ibm.com, joel@....id.au, lihuafei1@...wei.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        lukas.bulwahn@...il.com, mikey@...ling.org, nathan@...nel.org,
        nathanl@...ux.ibm.com, nicholas@...ux.ibm.com, npiggin@...il.com,
        pali@...nel.org, paul@...l-moore.com, rmclure@...ux.ibm.com,
        ruscur@...sell.cc, windhl@....com,
        wsa+renesas@...g-engineering.com, ye.xingchen@....com.cn,
        yuanjilin@...rlc.com, zhengyongjun3@...wei.com
Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-6.1-1 tag

On Wed, Oct 12, 2022 at 09:49:26AM -0600, Jason A. Donenfeld wrote:
> On Wed, Oct 12, 2022 at 07:18:27AM -0700, Guenter Roeck wrote:
> > NIP [c000000000031630] .replay_soft_interrupts+0x60/0x300
> > LR [c000000000031964] .arch_local_irq_restore+0x94/0x1c0
> > Call Trace:
> > [c000000007df3870] [c000000000031964] .arch_local_irq_restore+0x94/0x1c0 (unreliable)
> > [c000000007df38f0] [c000000000f8a444] .__schedule+0x664/0xa50
> > [c000000007df39d0] [c000000000f8a8b0] .schedule+0x80/0x140
> > [c000000007df3a50] [c00000000092f0dc] .try_to_generate_entropy+0x118/0x174
> > [c000000007df3b40] [c00000000092e2e4] .urandom_read_iter+0x74/0x140
> > [c000000007df3bc0] [c0000000003b0044] .vfs_read+0x284/0x2d0
> > [c000000007df3cd0] [c0000000003b0d2c] .ksys_read+0xdc/0x130
> > [c000000007df3d80] [c00000000002a88c] .system_call_exception+0x19c/0x330
> > [c000000007df3e10] [c00000000000c1d4] system_call_common+0xf4/0x258
> 
> Obviously the first couple lines of this concern me a bit. But I think
> actually this might just be a catalyst for another bug. You could view
> that function as basically just:
> 
>     while (something)
>     	schedule();
> 
> And I guess in the process of calling the scheduler a lot, which toggles
> interrupts a lot, something got wedged.
> 
> Curious, though, I did try to reproduce this, to no avail. My .config is
> https://xn--4db.cc/rBvHWfDZ . What's yours?
> 

Attached. My qemu command line is

qemu-system-ppc64 -M mac99 -cpu ppc64 \
     -m 1G -kernel vmlinux -snapshot -device e1000,netdev=net0 \
     -netdev user,id=net0 -device sdhci-pci -device sd-card,drive=d0 \
     -drive file=/var/cache/buildbot/ppc64/rootfs.ext2,format=raw,if=none,id=d0 \
     -nographic -vga none -monitor null -no-reboot \
     --append "root=/dev/mmcblk0 rootwait console=tty console=ttyS0"

Qemu version is 7.0. The root file system is from
https://github.com/groeck/linux-build-test/tree/master/rootfs/ppc64

I used to have self tests enabled, but with that (specifically, with
CONFIG_STRING_SELFTEST=y) I now get a different hang, so I disabled that
for the time being.

Guenter

View attachment "defconfig" of type "text/plain" (7871 bytes)