https://bugs.kde.org/show_bug.cgi?id=368923
John Reiser <jrei...@bitwagon.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jrei...@bitwagon.com
--- Comment #4 from John Reiser <jrei...@bitwagon.com> ---
Still happens in Valgrind-3.15.0 on arm64, notably in /usr/bin/perf.
# gdb perf
GNU gdb (GDB) Fedora 8.2.91.20190424-24.fc30
(gdb) b setns
Breakpoint 1 at 0x95ce4
(gdb) run report >bar
Starting program: /usr/bin/perf report >bar
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Breakpoint 1, 0x0000ffffbee68844 in setns () from /lib64/libc.so.6
(gdb) bt
#0 0x0000ffffbee68844 in setns () from /lib64/libc.so.6
#1 0x0000aaaaaac112c4 in nsinfo.mountns_enter ()
#2 0x0000aaaaaabe90b8 in ?? ()
#3 0x0000aaaaaabebfd8 in dso.type ()
#4 0x0000aaaaaac357fc in machine.findnew_vdso ()
#5 0x0000aaaaaac084dc in map.new ()
#6 0x0000aaaaaac065e8 in machine.process_mmap2_event ()
#7 0x0000aaaaaac0cd2c in ?? ()
#8 0x0000aaaaaac0d684 in ?? ()
#9 0x0000aaaaaac0ec90 in perf_session.process_events ()
#10 0x0000aaaaaab579cc in cmd_report ()
#11 0x0000aaaaaabb8fe4 in ?? ()
#12 0x0000aaaaaab42130 in main ()
(gdb) x/5i $pc-4
0xffffbee68840 <setns>: mov x8, #0x10c // #268
=> 0xffffbee68844 <setns+4>: svc #0x0
0xffffbee68848 <setns+8>: cmn x0, #0xfff
0xffffbee6884c <setns+12>: b.cs 0xffffbee68854 <setns+20> // b.hs,
b.nlast
0xffffbee68850 <setns+16>: ret
strace of perf shows:
=====
12549 openat(AT_FDCWD, "/proc/self/ns/mnt", O_RDONLY) = 10
12549 openat(AT_FDCWD, "/proc/424/ns/mnt", O_RDONLY) = 11
12549 setns(11, CLONE_NEWNS)
=====
and similarly for many other /proc/PID.
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