053b865412d1982ad1dc0e840898d82527deeb99 |
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07-Jun-2012 |
Jeff Brown <jeffbrown@google.com> |
Enhance native stack dumps. Provides a new mechanism for dumpstate (while running as root) to request that debuggerd dump the stacks of native processes that we care about in bug reports. In this mode, the backtrace is formatted to look similar to a Dalvik backtrace. Moved the tombstone generating code into a separate file to make it easier to maintain. Fixed a bug where sometimes the stack traces would be incomplete because we were not waiting for each thread to stop after issuing PTRACE_ATTACH, only the main thread. So sometimes we were missing traces for some threads. Refactored the logging code to prevent accidentally writing data to logcat when explicitly dumping a tombstone or backtrace from the console. Only root or system server can request to dump backtraces but only root can dump tombstones. Bug: 6615693 Change-Id: Ib3edcc16f9f3a687e414e3f2d250d9500566123b
/system/core/debuggerd/utility.h
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f0c5872637a63e28e3cd314cfc915c07f76df9c6 |
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04-Nov-2011 |
Jeff Brown <jeffbrown@google.com> |
Improve stack unwinder robustness. Keep track of whether memory maps are readable. Use the information in try_get_word to try to avoid accidentally dereferencing an invalid pointer within the current process. (Note that I haven't ever seen that happen during normal unwinding, but it pays to be a little more careful.) Refactored try_get_word a little to make it easier to pass it the needed state for validation checks by way of a little memory_t struct. Improved how the memory map for the current process is cached. This is important because we need up to date information about readable maps. Use a 5 second cache expiration. Improved the PC -> LR fallback logic in the unwinder so we can eke out an extra frame sometimes. Fixed a bug reading ELF program headers. The phnum & phentsize fields are half-words. We were incorrectly interpreting phnum as a whole word. Used android_atomic_* operations carefully in the unwinder to prevent possible memory races between the dumper and the dumpee. This was highly unlikely (or even impossible due to the presence of other barriers along the way) but the code is clearer now about its invariants. Fixed a bug in debuggerd where the pid was being passed to have its stack dump taken instead of the tid, resulting in short stacks because ptrace couldn't read the data if pid != tid. Did a full sweep to ensure that we use pid / tid correctly everywhere. Ported old code from debuggerd to rewind the program counter back one instruction so that it points to the branch instruction itself instead of the return address. Change-Id: Icc4eb08320052975a4ae7f0f5f0ac9308a2d33d7
/system/core/debuggerd/utility.h
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13e715b491e876865e752a3a69dd6f347049a488 |
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21-Oct-2011 |
Jeff Brown <jeffbrown@google.com> |
Use libcorkscrew in debuggerd. Change-Id: I5e3645a39d96c808f87075b49111d0262a19a0c8
/system/core/debuggerd/utility.h
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136dcc5ce628a1ba600a6818e5cb24d5f15eb016 |
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23-Sep-2011 |
Andy McFadden <fadden@android.com> |
Show maps near native fault address This adds some additional output to native crashes. For example, if something tried to access a bit of mmap(/dev/zero) memory that had been mprotect()ed, you might see output like this: I DEBUG : memory map around addr 4015a00c: I DEBUG : 40159000-4015a000 /system/lib/libstdc++.so I DEBUG : 4015a000-40162000 /dev/zero I DEBUG : b0001000-b0009000 /system/bin/linker The idea is to see what's in and around the fault address to make it easier to identify bus errors due to file truncation and segmentation faults caused by buffer over/underruns. No output is generated for accesses below 0x1000 (which are likely NULL pointer dereferences) or for signals that don't set si_addr. Also, suppress the fault address for signals that don't set si_addr: I DEBUG : signal 6 (SIGABRT), code 0 (?), fault addr -------- We still print "fault addr" followed by 8 characters for anything that is parsing the contents. The "address" shown for signals like SIGABRT was meaningless and possibly confusing. Bug 5358516 Change-Id: Icae8ef309ea2d89b129f68d30f96b2ca8a69cc6c
/system/core/debuggerd/utility.h
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2c259914a0c5d49a3fcb525a75f4817a3a99a6c8 |
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26-Jan-2011 |
David 'Digit' Turner <digit@google.com> |
debuggerd: Fix missing include. The structure user_vfp is incorrectly defined in bionic/libc/kernel/arch-arm/asm/ptrace.h at the moment, while it should be under bionic/libc/kernel/arch-arm/asm/user.h instead. Before moving its definition in the corresponding source files, we need to fix its users. It happens that debuggerd is the only one for now, so fix this by including <linux/user.h> instead (which will include <asm/user.h> and <asm/ptrace.h>). Also, make the debug output less chatty by specifying all symbols to be listed through XLOG2 instead of XLOG. Change-Id: I16e0fa700945d86efd44ee885a84ad609c0a9b58
/system/core/debuggerd/utility.h
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849249064cae9c1bb23b0204b5d35b832567801e |
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13-Oct-2010 |
Bruce Beare <bruce.j.beare@intel.com> |
debuggerd: Reorganize to facilitate IA commit Change-Id: I22dd02daf617672fc0a8ba7e396017c57f17e26e Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
/system/core/debuggerd/utility.h
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ae7b91b68008ab09635a97a18e7d07a35e8404aa |
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05-Nov-2009 |
Meng Hu <meng.hu@garmin.com> |
debuggerd: Show function names in tombstone backtraces This change enables debuggerd to provide backtraces with function names in tombstone files and log messages. It does this by reading the image file that the address is found in, and parsing the dynamic symbol table to try to extract the symbol corresponding to the given address. This works best when "-Wl,-export-dynamic" is added to the LDFLAGS of each library and executable, because this will cause all symbols to be added to the dynamic symbol table. If this flag is not present, it will still work, but it will only be able to identify functions which are part of the external API of the library/executable. Change-Id: I618baaff9ed9143b7d1a1f302224e9f21d2b0626
/system/core/debuggerd/utility.h
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dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0 |
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04-Mar-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //depot/cupcake/@135843
/system/core/debuggerd/utility.h
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e54eebbf1a908d65ee8cf80bab62821c05666d70 |
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04-Mar-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //depot/cupcake/@135843
/system/core/debuggerd/utility.h
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35237d135807af84bf9b0e5b8d7f8633e58db6f5 |
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18-Dec-2008 |
The Android Open Source Project <initial-contribution@android.com> |
Code drop from //branches/cupcake/...@124589
/system/core/debuggerd/utility.h
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4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 |
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21-Oct-2008 |
The Android Open Source Project <initial-contribution@android.com> |
Initial Contribution
/system/core/debuggerd/utility.h
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