On Wed, Dec 03, 2025 at 11:36:12AM +0000, Daniel P. Berrangé wrote:
> On Wed, Dec 03, 2025 at 11:26:15AM +0000, Daniel P. Berrangé wrote:
> > Normally bash in F42 runs with a prompt and we see
> >
> > 61385 ioctl(0,TCGETS,0x00007f34260697e8) = 0 ({c_iflag =
> > ICRNL|IXON,c_oflag = OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag =
> > ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "^C^\^?
> > ^U^D",c_line = '^@'})
> > 61385 ioctl(2,TCGETS,0x00007f34260697e8) = 0 ({c_iflag =
> > ICRNL|IXON,c_oflag = OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag =
> > ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "^C^\^?
> > ^U^D",c_line = '^@'})
> >
> > When I redirect stderr to a file/pipe the latter ioctl
> > obviously fails:
> >
> > 60841 ioctl(0,TCGETS,0x00007f19561fe7e8) = 0 ({c_iflag =
> > ICRNL|IXON,c_oflag = OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag =
> > ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "^C^\^?
> > 60841 ioctl(2,TCGETS,0x00007f19561fe7e8) = -1 errno=25 (Inappropriate
> > ioctl for device)
> >
> >
> > Now looking at F43 bash I no longer see QEMU reporting TCGETS
> > ioctl, instead I see
> >
> > 61809 ioctl(0,0x802c542a,0xd73fe8f4) = -1 errno=25 (Inappropriate ioctl
> > for device)
> >
> > that suggests to me that bash is probably using a different (new?)
> > ioctl that QEMU does not have emulation for currently.
>
> IIUC, 0x802c542a corresponds to TCGETS2, and indeed QEMU does not
> currently emulate TCGETS2 which can be seen with QEMU's logging:
>
> # qemu-s390x -d unimp -L `pwd` ./usr/bin/bash 2>&1
> Unsupported syscall: 383
> Unsupported ioctl: cmd=0xffffffff802c542a
>
> IOW, F43 or later will be broken until this is impl in QEMU
Already reported to QEMU upstream at
https://gitlab.com/qemu-project/qemu/-/issues/3065
And in Fedora context I see it affects aarch64 containers in addition
to s390x, but interestly NOT the ppc64le containers (when tested from
an x86_64 host).
I'm unclear if x86_64 is also affected when run from from a non-x86_64
host since I don't have a machine to test that scenario on
With regards,
Daniel
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