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Bug#843128: partially solved

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On Fri, 2016-12-09 at 01:18 -0300, Ricardo Fabian Peliquero wrote:
> Dear Maintainer,
> 
> After upgrading
> 
>  from: linux-image-4.8.0-1-amd64-unsigned:amd64 (4.8.5-1)
>    to: linux-image-4.9.0-rc8-amd64-unsigned:amd64 (4.9~rc8-1~exp1)
> 
> and installing mingetty(8)
> 
> the system is booting well (e.g. without kernel panic).
> 
> But the following errors appeared for ttys using these lines in /etc/inittab:
> 
> 2:23:respawn:/sbin/fgetty tty2
> # Produces error. Output:
>  [   14.741345] fgetty[1309] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffcb7dbade0 ax:ff[   14.753469] fgetty[1309]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffcb7dbade0 error 15
>  [   14.761442] fgetty[1314] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffc57494eb0 ax:ff[   14.774655] fgetty[1314]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffc57494eb0 error 15
>  [   14.783045] fgetty[1315] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7fff4cd23c40 ax:ff[   14.797132] fgetty[1315]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007fff4cd23c40 error 15
>  [   14.805678] fgetty[1316] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffebc275580 ax:ff[   14.820255] fgetty[1316]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffebc275580 error 15
>  [   14.829085] fgetty[1317] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffdf2ba87d0 ax:ff[   14.846203] fgetty[1317]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffdf2ba87d0 error 15
>  [   14.855785] fgetty[1318] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7fff05d8bca0 ax:ff[   14.873951] fgetty[1318]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007fff05d8bca0 error 15
>  [   14.883984] fgetty[1319] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffdb25fe940 ax:ff[   14.903582] fgetty[1319]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffdb25fe940 error 15
>  [   14.914209] fgetty[1320] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffe39d6bda0 ax:ff[   14.934960] fgetty[1320]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffe39d6bda0 error 15
>  [   14.946825] fgetty[1321] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7fff000656c0 ax:ff[   14.968608] fgetty[1321]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007fff000656c0 error 15
>  [   14.981397] fgetty[1322] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7fffa6d94100 ax:ff[   15.004560] fgetty[1322]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007fffa6d94100 error 15
>  INIT: Id "2" respawning too fast: disabled for 5 minutes
> 
> 3:23:respawn:/sbin/ngetty 3
> # Produces error. Output:
>  [   14.670134] ngetty-helper[1311] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffca011e1a[   14.684298] ngetty-helper[1311]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffca011e1a0 error 15
> 
> 
> Please let me know if you consider these errors should be reported to fgetty and ngetty maintainers.

fgetty uses dietlibc, and the stable version of dietlibc still uses the
vsyscall feature which is now disabled by default.  You can make it
work again by adding 'vsyscall=emulate' to the kernel command line.

I'll have to reconsider whether to revert the configuration change now
that I know dietlibc is a problem.

Ben.

-- 
Ben Hutchings
Logic doesn't apply to the real world. - Marvin Minsky

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Bug#843128: partially solved Ricardo Fabian Peliquero <zhana@lasampa.com.ar> - 2016-12-09 05:30 +0100
  Bug#843128: partially solved Ben Hutchings <ben@decadent.org.uk> - 2016-12-09 14:10 +0100
    Bug#843128: partially solved Ricardo Fabian Peliquero <zhana@lasampa.com.ar> - 2016-12-09 17:40 +0100
    Bug#843128: partially solved Didier 'OdyX' Raboud <odyx@debian.org> - 2016-12-19 12:20 +0100

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