Messages in this thread | | | Date | Wed, 18 Sep 2013 10:17:49 +0100 | From | Will Deacon <> | Subject | Re: Commit breaks strace: ARM: entry: allow ARM-private syscalls to be restarted |
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On Tue, Sep 17, 2013 at 10:57:49PM +0100, Jason Gunthorpe wrote: > Hi Will,
Hi Jason,
> I was just testing v3.12-rc1 (on kirkwood) and noticed that strace is > not working:
Thanks for the report!
> $ strace /bin/ls > mmap2(0xb6f79000, 9552, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6f79000 > close(3) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6fad000 > set_tls(0xb6fad4c0, 0xb6fadb98, 0xb6fb1050, 0xb6fad4c0, 0xb6fb1050) = -1 ENOSYS (Function not implemented) > writev(2, [{"cannot set up thread-local stora"..., 36}, {"unknown error", 13}, {"\n", 1}], 3cannot set up thread-local storage: unknown error > ) = 50 > exit_group(127) = ? > +++ exited with 127 +++ > > I determined that reverting your commit below makes strace work again. > I've tested 3.10.12 and it is OK.
Hmm, so if you don't run with strace, does `/bin/ls' work as expected? From the trace above, it seems that set_tls is failing rather than anything in strace (unless of course, the trace is just plain wrong).
> This happens with the latest git head for strace, as well as the 4.7 > release. > > Hopefully you can cook up a fix :)
I'll take a look today, thanks.
Will
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