From: Robert Schwebel <r.schwebel@pengutronix.de>
To: Christian Schoenebeck <linux_oss@crudebyte.com>
Cc: Eric Van Hensbergen <ericvh@kernel.org>,
Robert Schwebel <r.schwebel@pengutronix.de>,
Latchesar Ionkov <lucho@ionkov.net>,
Dominique Martinet <asmadeus@codewreck.org>,
v9fs@lists.linux.dev, kernel@pengutronix.de
Subject: Re: mmap on 9p broken in 6.4
Date: Wed, 12 Jul 2023 16:14:02 +0200 [thread overview]
Message-ID: <ZK61Kpii5To2zMJx@pengutronix.de> (raw)
In-Reply-To: <3123765.Wy8GRVaxaG@silver>
Christian,
On Wed, Jul 12, 2023 at 11:01:53AM +0200, Christian Schoenebeck wrote:
> > TL;DR: mmap() seems to be broken on 9pfs on Linux 6.4. setting
> > "rootflags=ignoreqv" fixes it as well, but it feels like a regression.
>
> What's the precise set of 9p mount options on guest, which 9p server is used
> and what are 9p server's options respectively?
The server is qemu, started like this:
qemu-system-arm -machine vexpress-a9 -cpu cortex-a9 -smp 4 -m 1024M -nographic -no-reboot -net nic,netdev=net1 -netdev user,id=net1,hostfwd=tcp:127.0.0.1:27737-:22,hostfwd=tcp:127.0.0.1:12345-:12345 -rtc base=2000-01-01 -object rng-random,filename=/dev/random,id=rng0 -device virtio-rng-device,rng=rng0 -device virtio-scsi-device,id=scsi -fsdev local,id=rootfs,path=./platform-v7a/root,security_model=mapped-file -device virtio-9p-device,fsdev=rootfs,mount_tag=/dev/root -kernel ./platform-v7a/images/linuximage -dtb ./platform-v7a/images/vexpress-v2p-ca9.dtb -append 'root=/dev/root rootfstype=9p rootflags=trans=virtio console=ttyAMA0,115200 loglevel=5 systemd.show_status=auto'
This is qemu 8.0.2.
> > I could track down the breakage to
> >
> > 1543b4c5071c54d76aad7a7a26a6e43082269b0c
>
> This patch is sensitive about 9p server transmitting a meaningful value for
> file's QID version field. That's why more info about deployed 9p server would
> help.
rsc
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next prev parent reply other threads:[~2023-07-12 14:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-11 20:19 mmap on 9p broken in 6.4 Robert Schwebel
2023-07-12 9:01 ` Christian Schoenebeck
2023-07-12 14:14 ` Robert Schwebel [this message]
2023-07-12 15:57 ` Christian Schoenebeck
2023-07-12 22:15 ` Robert Schwebel
2023-07-13 7:50 ` Christian Schoenebeck
[not found] ` <CAFkjPTmrbe9Djs_iYf=vu1xbTLhey0OmePR2Jw=C_dbQVYnAhQ@mail.gmail.com>
2023-07-13 10:54 ` Christian Schoenebeck
2023-07-14 5:36 ` Robert Schwebel
2023-07-16 14:54 ` Eric Van Hensbergen
2023-07-16 19:48 ` Eric Van Hensbergen
2023-07-17 11:26 ` Robert Schwebel
2023-07-17 15:29 ` Eric Van Hensbergen
2023-07-17 18:11 ` Eric Van Hensbergen
2023-07-17 18:59 ` Eric Van Hensbergen
2023-07-14 5:34 ` Robert Schwebel
2023-07-13 11:22 ` Linux regression tracking #adding (Thorsten Leemhuis)
2023-07-26 14:07 ` Linux regression tracking #update (Thorsten Leemhuis)
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