Red Hat Bugzilla – Bug 681536
/usr/bin/sftp throws alignment errors on ARM
Last modified: 2011-06-27 08:06:11 EDT
Description of problem:
/usr/bin/sftp is throwing alignment errors on the ARM platform.
Version-Release number of selected component (if applicable):
With some difficulty. Don't have a reliable test case yet. I have only observed two instances of this getting caught in the logs so far.
kernel: Alignment trap: sftp (2658) PC=0x2a00c748 Instr=0xe1c600f4 Address=0x2a0238b4 FSR 0x801
No alignment warnings.
Recent ARMv7 chips includes automatic alignment fix-up in hardware, so testing
for this has to be done on ARMv6 or earlier.
Will attach a test case and a strace when I have a reliably reproducible test case. The reason I decided to open a bug report before I have these because being in the openssh package, it could potentially have security implictions.
Without a backtrace this is unfortunately unfixable. Is it possible to make the kernel to dump core of the process in such situation?
Indeed it is, but I was running with warn+fixup enabled at the time, rather than warn+sigbus. I will continue working on reproducing the problem and report back when I have a core.
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