Arm Linux Bus Error
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Bus Error In Linux Terminal
Sign up What is a bus error? up vote 154 down vote favorite 49 What does the "bus error" message mean, and how does it differ from a segfault? c unix segmentation-fault bus-error share|improve this question edited Oct 18 '15 at
How To Solve Bus Error In Linux
10:44 Cool Guy 15.8k51952 asked Oct 17 '08 at 14:48 raldi 7,226216178 add a comment| 15 Answers 15 active oldest votes up vote 149 down vote accepted Bus errors are rare nowadays on x86 and occur when your processor cannot even attempt the memory access requested, typically: using a processor instruction with an address that does not satisfy its alignment requirements. Segmentation faults occur when accessing memory which does not belong to your process, they are very common and are typically the result arm linux distro of: using a pointer to something that was deallocated. using an uninitialized hence bogus pointer. using a null pointer. overflowing a buffer. PS: To be more precise this is not manipulating the pointer itself that will cause issues, it's accessing the memory it points to (dereferencing). share|improve this answer edited Oct 17 '08 at 15:18 answered Oct 17 '08 at 15:12 bltxd 5,68322336 52 They aren't rare; I'm just at Exercise 9 from How to Learn C the Hard Way and already encountered one... –11684 Mar 26 '13 at 20:12 5 Another cause of bus errors (on Linux anyway) is when the operating system can't back a virtual page with physical memory (e.g. low-memory conditions or out of huge pages when using huge page memory.) Typically mmap (and malloc) just reserve the virtual address space, and the kernel assigns the physical memory on demand (so called soft page faults.) Make a large enough malloc, and then write to enough of it and you'll get a bus error. –Eloff Jul 14 '15 at 0:09 add a comment| up vote 55 down vote A segfault is accessing memory that you're not allowed to access. It's read-only, you don't have permission, etc... A bus error is trying to access memory that can't possibly be there. You've used an address that's meaningless to the system, or the wrong kind of address for that operation. share|improve this answer answered Oct 17 '08 at 14:55 Clinton Pierce 6,87394576 add a
BUS error on misaligned memory access on some ARM Reported by: notzed Owned by: Priority: normal Component: build system Version: unspecified
Arm Processor Linux
Keywords: arm crash SIGBUS Cc: jacob Blocked By: Blocking: Reproduced arm linux board by developer: no Analyzed by developer: no Description (last modified by cehoyos) By default configure qemu arm linux on armv6+ enables misaligned memory accesses using the HAVE_FAST_UNALIGNED define. I think some(?) ARM cpu's have run-time configurable exception behaviour for misaligned memory accesses, and http://stackoverflow.com/questions/212466/what-is-a-bus-error unaligned access causes BUS errors if so configured. On locked android machines this cannot be changed by the user, and in general it's a global system setting so not appropriate to change anyway. Crash is reported for a Tegra 3 tablet - ASUS transformer prime. example crash below, where: https://trac.ffmpeg.org/ticket/1481 ldr r3, [r0, r1, lsr #3] equates to: *((unsigned int *)(r0 + r1 >> 3)) Strangely this error is still quite rare and un-predictable, so I'm not certain this is the cause. But manually disabling HAVE_FAST_UNALIGNED seems to fix it. I don't really know what to suggest, perhaps allow HAVE_FAST_UNALIGNED to be overridden by a configure option. Program received signal SIGBUS, Bus error. [Switching to Thread 12614] mpeg4_decode_block (s=0x1f97f40, block=
cloning? Learn how to clone a repository. Clone in SourceTree Atlassian SourceTree https://bitbucket.org/cffi/cffi/issues/137/bus-error-running-the-tests-on-arm-linux is a free Git and Mercurial client for Windows. Atlassian SourceTree is a free Git and Mercurial client for Mac. Python CFFI Untitled project cffi Issues Issues Create issue Issue #137 resolved bus error running the tests on arm-linux-gnueabihf Anonymous created an issue 2014-01-18 seen bus error with 0.8.1 and 2.7.6 on arm-linux-gnueabihf (Ubuntu trusty) https://launchpad.net/ubuntu/+source/python-cffi/0.8.1-0ubuntu1/+build/5475601 ============================= test session starts ============================== platform linux2 -- Python 2.7.6 -- pytest-2.5.1 collected 1091 items c/test_c.py .........s.........................................................................Bus error E: pybuild pybuild:256: test: plugin custom failed with: exit code=135: python2.7 -m pytest c/ testing/ dh_auto_test: pybuild --test linux bus error -i python{version} -p 2.7 --dir . returned exit code 13 make[1]: *** [override_dh_auto_test] Error 13 this seems to be a regression compared to 0.7.2 Comments (7) Stefano Rivera edited description Edited: Reformatted output. Also: armhf, not arm64. Interestingly, this happens in Ubuntu trusty, but not in Debian unstable, and they use the same libffi and Python. But slighlty different builds of gcc. Starting program: /usr/bin/python -m pytest -s ../../../c/ ../../../testing/ -k test_callback_receiving_tiny_struct [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1". Program received signal SIGILL, Illegal instruction. 0xb6aed1e8 in ?? () from /lib/arm-linux-gnueabihf/libcrypto.so.1.0.0 (gdb) cont Continuing. ============================== test session starts ============================== platform linux2 -- Python 2.7.6 -- pytest-2.5.1 collected 1091 items ../../../c/test_c.py Program received signal SIGBUS, Bus error. 0xb6a6d99c in ffi_closure_VFP () from /usr/lib/arm-linux-gnueabihf/libffi.so.6 (gdb) bt #0 0xb6a6d99c in ffi_closure_VFP () from /usr/