Public bug reported:
Using kernel 5.0.0-27-generic on Ubuntu 18.04 in a container, every
pathname in /proc/<pid>/maps is / instead of the mapped file path.
This appears to be a regression in 5.0.0-27-generic; it works on
5.0.0-25-generic. The problem can be reproduced in various Ubuntu
releases, e.g. 18.04 and 19.04.
5.0.0-25-generic (working):
$ sudo docker run ubuntu cat /proc/1/maps
56324a3f5000-56324a3fd000 r-xp 00000000 fc:01 665673
/bin/cat
56324a5fc000-56324a5fd000 r--p 00007000 fc:01 665673
/bin/cat
56324a5fd000-56324a5fe000 rw-p 00008000 fc:01 665673
/bin/cat
56324a8eb000-56324a90c000 rw-p 00000000 00:00 0 [heap]
7f8ab5f91000-7f8ab6178000 r-xp 00000000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab6178000-7f8ab6378000 ---p 001e7000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab6378000-7f8ab637c000 r--p 001e7000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab637c000-7f8ab637e000 rw-p 001eb000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab637e000-7f8ab6382000 rw-p 00000000 00:00 0
7f8ab6382000-7f8ab63a9000 r-xp 00000000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
7f8ab6583000-7f8ab65a7000 rw-p 00000000 00:00 0
7f8ab65a9000-7f8ab65aa000 r--p 00027000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
7f8ab65aa000-7f8ab65ab000 rw-p 00028000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
7f8ab65ab000-7f8ab65ac000 rw-p 00000000 00:00 0
7ffc25954000-7ffc25975000 rw-p 00000000 00:00 0 [stack]
7ffc259f1000-7ffc259f4000 r--p 00000000 00:00 0 [vvar]
7ffc259f4000-7ffc259f5000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
[vsyscall]
5.0.0-27-generic (broken):
$ sudo docker run ubuntu cat /proc/1/maps
55de0e052000-55de0e05a000 r-xp 00000000 fc:01 665673 /
55de0e259000-55de0e25a000 r--p 00007000 fc:01 665673 /
55de0e25a000-55de0e25b000 rw-p 00008000 fc:01 665673 /
55de0fcb3000-55de0fcd4000 rw-p 00000000 00:00 0 [heap]
7f7a8d881000-7f7a8da68000 r-xp 00000000 fc:01 666073 /
7f7a8da68000-7f7a8dc68000 ---p 001e7000 fc:01 666073 /
7f7a8dc68000-7f7a8dc6c000 r--p 001e7000 fc:01 666073 /
7f7a8dc6c000-7f7a8dc6e000 rw-p 001eb000 fc:01 666073 /
7f7a8dc6e000-7f7a8dc72000 rw-p 00000000 00:00 0
7f7a8dc72000-7f7a8dc99000 r-xp 00000000 fc:01 666055 /
7f7a8de73000-7f7a8de97000 rw-p 00000000 00:00 0
7f7a8de99000-7f7a8de9a000 r--p 00027000 fc:01 666055 /
7f7a8de9a000-7f7a8de9b000 rw-p 00028000 fc:01 666055 /
7f7a8de9b000-7f7a8de9c000 rw-p 00000000 00:00 0
7ffc744bd000-7ffc744de000 rw-p 00000000 00:00 0 [stack]
7ffc7452d000-7ffc74530000 r--p 00000000 00:00 0 [vvar]
7ffc74530000-7ffc74531000 r-xp 00000000 00:00 0 [vdso]
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
Using kernel 5.0.0-27-generic on Ubuntu 18.04 in a container, every
pathname in /proc/<pid>/maps is / instead of the mapped file path.
This appears to be a regression in 5.0.0-27-generic; it works on
5.0.0-25-generic. The problem can be reproduced in various Ubuntu
releases, e.g. 18.04 and 19.04.
5.0.0-25-generic (working):
+ ```
$ sudo docker run ubuntu cat /proc/1/maps
56324a3f5000-56324a3fd000 r-xp 00000000 fc:01 665673
/bin/cat
56324a5fc000-56324a5fd000 r--p 00007000 fc:01 665673
/bin/cat
56324a5fd000-56324a5fe000 rw-p 00008000 fc:01 665673
/bin/cat
56324a8eb000-56324a90c000 rw-p 00000000 00:00 0
[heap]
7f8ab5f91000-7f8ab6178000 r-xp 00000000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab6178000-7f8ab6378000 ---p 001e7000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab6378000-7f8ab637c000 r--p 001e7000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab637c000-7f8ab637e000 rw-p 001eb000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
- 7f8ab637e000-7f8ab6382000 rw-p 00000000 00:00 0
+ 7f8ab637e000-7f8ab6382000 rw-p 00000000 00:00 0
7f8ab6382000-7f8ab63a9000 r-xp 00000000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
- 7f8ab6583000-7f8ab65a7000 rw-p 00000000 00:00 0
+ 7f8ab6583000-7f8ab65a7000 rw-p 00000000 00:00 0
7f8ab65a9000-7f8ab65aa000 r--p 00027000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
7f8ab65aa000-7f8ab65ab000 rw-p 00028000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
- 7f8ab65ab000-7f8ab65ac000 rw-p 00000000 00:00 0
+ 7f8ab65ab000-7f8ab65ac000 rw-p 00000000 00:00 0
7ffc25954000-7ffc25975000 rw-p 00000000 00:00 0
[stack]
7ffc259f1000-7ffc259f4000 r--p 00000000 00:00 0
[vvar]
7ffc259f4000-7ffc259f5000 r-xp 00000000 00:00 0
[vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
[vsyscall]
+ ```
+
5.0.0-27-generic (broken):
$ sudo docker run ubuntu cat /proc/1/maps
55de0e052000-55de0e05a000 r-xp 00000000 fc:01 665673 /
55de0e259000-55de0e25a000 r--p 00007000 fc:01 665673 /
55de0e25a000-55de0e25b000 rw-p 00008000 fc:01 665673 /
55de0fcb3000-55de0fcd4000 rw-p 00000000 00:00 0
[heap]
7f7a8d881000-7f7a8da68000 r-xp 00000000 fc:01 666073 /
7f7a8da68000-7f7a8dc68000 ---p 001e7000 fc:01 666073 /
7f7a8dc68000-7f7a8dc6c000 r--p 001e7000 fc:01 666073 /
7f7a8dc6c000-7f7a8dc6e000 rw-p 001eb000 fc:01 666073 /
- 7f7a8dc6e000-7f7a8dc72000 rw-p 00000000 00:00 0
+ 7f7a8dc6e000-7f7a8dc72000 rw-p 00000000 00:00 0
7f7a8dc72000-7f7a8dc99000 r-xp 00000000 fc:01 666055 /
- 7f7a8de73000-7f7a8de97000 rw-p 00000000 00:00 0
+ 7f7a8de73000-7f7a8de97000 rw-p 00000000 00:00 0
7f7a8de99000-7f7a8de9a000 r--p 00027000 fc:01 666055 /
7f7a8de9a000-7f7a8de9b000 rw-p 00028000 fc:01 666055 /
- 7f7a8de9b000-7f7a8de9c000 rw-p 00000000 00:00 0
+ 7f7a8de9b000-7f7a8de9c000 rw-p 00000000 00:00 0
7ffc744bd000-7ffc744de000 rw-p 00000000 00:00 0
[stack]
7ffc7452d000-7ffc74530000 r--p 00000000 00:00 0
[vvar]
7ffc74530000-7ffc74531000 r-xp 00000000 00:00 0
[vdso]
** Description changed:
Using kernel 5.0.0-27-generic on Ubuntu 18.04 in a container, every
pathname in /proc/<pid>/maps is / instead of the mapped file path.
This appears to be a regression in 5.0.0-27-generic; it works on
5.0.0-25-generic. The problem can be reproduced in various Ubuntu
releases, e.g. 18.04 and 19.04.
5.0.0-25-generic (working):
- ```
$ sudo docker run ubuntu cat /proc/1/maps
56324a3f5000-56324a3fd000 r-xp 00000000 fc:01 665673
/bin/cat
56324a5fc000-56324a5fd000 r--p 00007000 fc:01 665673
/bin/cat
56324a5fd000-56324a5fe000 rw-p 00008000 fc:01 665673
/bin/cat
56324a8eb000-56324a90c000 rw-p 00000000 00:00 0
[heap]
7f8ab5f91000-7f8ab6178000 r-xp 00000000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab6178000-7f8ab6378000 ---p 001e7000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab6378000-7f8ab637c000 r--p 001e7000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab637c000-7f8ab637e000 rw-p 001eb000 fc:01 666073
/lib/x86_64-linux-gnu/libc-2.27.so
7f8ab637e000-7f8ab6382000 rw-p 00000000 00:00 0
7f8ab6382000-7f8ab63a9000 r-xp 00000000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
7f8ab6583000-7f8ab65a7000 rw-p 00000000 00:00 0
7f8ab65a9000-7f8ab65aa000 r--p 00027000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
7f8ab65aa000-7f8ab65ab000 rw-p 00028000 fc:01 666055
/lib/x86_64-linux-gnu/ld-2.27.so
7f8ab65ab000-7f8ab65ac000 rw-p 00000000 00:00 0
7ffc25954000-7ffc25975000 rw-p 00000000 00:00 0
[stack]
7ffc259f1000-7ffc259f4000 r--p 00000000 00:00 0
[vvar]
7ffc259f4000-7ffc259f5000 r-xp 00000000 00:00 0
[vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
[vsyscall]
- ```
5.0.0-27-generic (broken):
$ sudo docker run ubuntu cat /proc/1/maps
55de0e052000-55de0e05a000 r-xp 00000000 fc:01 665673 /
55de0e259000-55de0e25a000 r--p 00007000 fc:01 665673 /
55de0e25a000-55de0e25b000 rw-p 00008000 fc:01 665673 /
55de0fcb3000-55de0fcd4000 rw-p 00000000 00:00 0
[heap]
7f7a8d881000-7f7a8da68000 r-xp 00000000 fc:01 666073 /
7f7a8da68000-7f7a8dc68000 ---p 001e7000 fc:01 666073 /
7f7a8dc68000-7f7a8dc6c000 r--p 001e7000 fc:01 666073 /
7f7a8dc6c000-7f7a8dc6e000 rw-p 001eb000 fc:01 666073 /
7f7a8dc6e000-7f7a8dc72000 rw-p 00000000 00:00 0
7f7a8dc72000-7f7a8dc99000 r-xp 00000000 fc:01 666055 /
7f7a8de73000-7f7a8de97000 rw-p 00000000 00:00 0
7f7a8de99000-7f7a8de9a000 r--p 00027000 fc:01 666055 /
7f7a8de9a000-7f7a8de9b000 rw-p 00028000 fc:01 666055 /
7f7a8de9b000-7f7a8de9c000 rw-p 00000000 00:00 0
7ffc744bd000-7ffc744de000 rw-p 00000000 00:00 0
[stack]
7ffc7452d000-7ffc74530000 r--p 00000000 00:00 0
[vvar]
7ffc74530000-7ffc74531000 r-xp 00000000 00:00 0
[vdso]
** Bug watch added: github.com/dotnet/corefx/issues #40850
https://github.com/dotnet/corefx/issues/40850
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https://bugs.launchpad.net/bugs/1843018
Title:
5.0.0-27-generic: /proc/<pid>/maps: Pathnames are '/' inside a
container
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