Since only privileged processes with CAP_SYS_ADMIN can read kernel
stack traces from /proc/*/stack, we dump the waiting channels
instead to provide some insight as to where the process might
be stuck in the kernel.
Bug: 135458700
Fixes: 135458700
Test: adb shell am hang; Check /data/anr/<anr-file> for
wchan data.
Change-Id: I9f13511ad89a259ce5e5465155db15d45d2c46d8
Test: Ran new unit tests.
Test: Ran crasher stack-overflow, crasher64 stack-overflow and verified
Test: stack overflow cause is shown.
Test: Ran stack overflow app and verified tombstone includes stack-overflow
Test: message.
Change-Id: I9bb01186dff5ed81c77d84b6aaedb5332ddd7256
This is for Android Telemetry to be able to categorise the processes
that produce tombstones.
Test: atest debugerd_test:TombstoneTest
Change-Id: Ie635347c9839eb58bfd27739050bd68cbdbf98da
Modify the unwinder library to indicate that at least one of the stack
frames contains an elf file that is unreadable.
Modify debuggerd to display a note about the unreadable frame and a possible
way to fix it.
Bug: 129769339
Test: New unit tests pass.
Test: Ran an app that crashes and has an unreadable file and verified the
Test: message is displayed. Then setenforce 0 and verify the message is
Test: not displayed.
Change-Id: Ibc4fe1d117e9b5840290454e90914ddc698d3cc2
There appears to be a kernel bug that causes SIGHUP and SIGCONT to be
sent to the parent process group we spawn from if the process group
contains stopped jobs (e.g. the parent itself, because of wait_for_gdb).
Call setsid in all of our children to prevent this from happening.
Bug: http://b/31124563
Test: adb shell 'setprop debug.debuggerd.wait_for_gdb 1; killall -ABRT surfaceflinger'
Change-Id: I1a48d70886880a5bfbe2deb80d48deece55faf09
Somehow the code was still including this include from libbacktrace.
I think the libbacktrace include directory was coming from some
transitive includes. I verified that nothing in debuggerd is using
the libbacktace.so shared library.
Bug: 120606663
Test: Builds, unit tests pass.
Change-Id: I85c2837c5a539ccefc5a7140949988058d21697a
Update the entries only when the list is modified by the runtime.
Check that the list wasn't concurrently modified when being read.
Bug: 124287208
Test: libunwindstack_test
Test: art/test.py -b --host -r -t 137-cfi
Change-Id: I87ba70322053a01b3d5be1fdf6310e1dc21bb084
Update debuggerd to print BuildId information by default.
Bug: 120975492
Test: New unit tests pass.
Test: debuggerd -b <PID> shows build id information.
Test: tombstones include build id information.
Change-Id: I019b031113d0b77385516223c63455b868924440
If a process is ptraced already, we might not be able to exec crash_dump
due to selinux. Since we can be called for non-fatal events, we
shouldn't abort in that case.
Bug: http://b/128054996
Test: treehugger
Change-Id: I1442041caa7af908df2ab87b9e010c44082e7587
Currently, moving or copying a Maps object leads to double free of MapInfo.
Even moving a Maps object did not prevent this, as after a move
the object only has to be in an "unspecified but valid state", which can
be the original state for a vector of raw pointers (but not for a vector
of unique_ptrs).
Changing to unique_ptrs is the most failsafe way to make sure we never
accidentally destruct MapInfo.
Test: atest libuwindstack_test
Failed LocalUnwinderTest#unwind_after_dlopen which also fails at master.
Change-Id: Id1c9739b334da5c1ba532fd55366e115940a66d3
It should be dlopen'ed lazily by libdexfile_support now.
Also change debuggerd_test to not link libunwindstack and its dependencies
statically - the static libs can overlap with the dynamic ones.
Test: mmma system/core/debuggerd/
Test: atest debuggerd_test
Test: mmma system/core/{libunwindstack,libbacktrace}, run host gtests (cannot get atest to work)
Bug: 124827589
Bug: 123186083
Change-Id: I9e7bf9bcbae499af4e1be4c9854bce441e2a7b55
This is necessary since the dynamic one is now using dlopen(), which isn't
available in static builds.
Test: m
Test: mmma system/core/{libunwindstack,libbacktrace}, run host gtests (cannot get atest to work)
Bug: 123403798
Bug: 123186083
Change-Id: I06a9cdfe7e7cc01427ffd54b66c8ebab88782260
Small modifications to the dump_stack method and added unit tests to
verify the output.
Bug: 120606663
Test: Unit tests pass, debuggerd run on processes on target.
Change-Id: Id385a915b751abda3dd6baebed6c3ce498c3bf6e
With our method returning 'bool', a "return -1" is interpretted
as 'true'. We change this to an explicit 'false', as desired.
Test: TreeHugger
Change-Id: I222858b797bc4242a2dc6d4fe81df3d2586d055a
This reverts commit 444e23d2fc.
The rest of the topic doesn't need to be reverted.
Reason for revert: Breaks renderscript on marlin and sailfish.
Test: Manual repro of http://b/121110092#comment1 on reported branch
Test: "atest CtsRenderscriptTestCases" on that branch
Test: mmma system/core/{libunwindstack,libbacktrace}, run host gtests
Test: Make image, flash, and reboot device.
Bug: 121110092, 119632407
Change-Id: If1976b19ce386c95bc5bd4fd6d523745c167de18
There is a problem about tombstone, which it will fail to
generate tombstone file in some scenarios due to socket
communication exception.
Reproduce step:
step 1: reboot device
step 2: ps -ef |grep zygote , get the pid of zygote64
(Attention: zygote64 should never been killed or reboot,
otherwise we can get the tombstone file)
step 3: kill -5 pid of zygote64
step 4: cd data/tombstones/, and could not find the tombstone
file of zygote64.
[Cause Analysis]
1. There are following logs by logcat:
11-19 15:38:43.789 569 569 F libc : Fatal signal 5 (SIGTRAP),
code 0 (SI_USER) in tid 569 (main), pid 569 (main)
11-19 15:38:43.829 6115 6115 I crash_dump64: obtaining output
fd from tombstoned, type: kDebuggerdTombstone
11-19 15:38:43.830 569 5836 I Zygote : Process 6114 exited
cleanly (0)
11-19 15:38:43.830 777 777 I /system/bin/tombstoned: received
crash request for pid 569
11-19 15:38:43.831 6115 6115 I crash_dump64: performing dump of
process 569 (target tid = 569)
...
11-19 15:38:43.937 777 777 W /system/bin/tombstoned: crash
socket received short read of length 0 (expected 12)
2. The last log was print by function of crash_request_cb in
file of tombstoned.cpp, following related code:
rc = TEMP_FAILURE_RETRY(read(sockfd, &request, sizeof(request)));
if (rc == -1) {
PLOG(WARNING) << "failed to read from crash socket";
goto fail;
} else if (rc != sizeof(request)) {
LOG(WARNING) << "crash socket received short read of length " << rc << " (expected "
<< sizeof(request) << ")";
goto fail;
}
Tombstoned read message by socket, and now the message length is
zero. Some socket communication exception occurs at that time.
We try to let crash_dump resend the socket message when the
communication is abnormal. Just as this CL.
Test: 1 reboot device
2 ps -ef |grep zygote , get the pid of zygote64
(Attention: zygote64 should never been killed or reboot,
otherwise we can get the tombstone file)
3 kill -5 pid of zygote64
4 cd data/tombstones/, and could find the tombstone file of
zygote64.
Change-Id: Ic152b081024d6c12f757927079fd221b63445b18
Make XOM related crashes a little less mysterious by adding an abort
cause explaining the crash.
Bug: 77958880
Test: Abort cause in tombstone for a XOM-related crash.
Change-Id: I7af1bc251d9823bc755ad98d8b3b87c12bbaecba
Previously, when we received simultaneous dump requests, we were CASing
a file descriptor value into a variable, and then failing to close it
if the CAS failed.
Bug: http://b/118412443
Test: debuggerd_test
Change-Id: I075c35a239426002eb9416da3d268c3d1a18e9d2
TEMP_FAILURE_RETRY's result was unused for the call to read(), so now
mark it as such to silence a possible unused result warning. For
__read_chk(), this function is an internal implementation detail of
FORTIFY in Bionic. Under clang-tidy, FORTIFY checks are actually
removed, so this now results in an unknown function being called. The
code should not be explicitly depending on an implementation detail, but
we can just suppress the failing case to retain test coverage of the
actual implementation.
Bug: http://b/110779387
Test: Build using WITH_TIDY=1
Change-Id: If83ac1d6f3b6dc32c0d0fb56d8e675e53b586f78
Previously, if an intercept ends before we ask for a file descriptor
when doing a backtrace, we'll create a tombstone file instead.
Bug: http://b/114139908
Bug: http://b/115349586
Test: debuggerd_test32
Change-Id: I23c7bb8ae5a982a4374a862d0a4f17bee03eb1d9
system_server is sometimes failing to dump with the following error:
libdebuggerd_client: received packet of unexpected length from tombstoned: expected 128, received -1
Improve the logging to try to figure out what's going on.
Bug: http://b/114139908
Test: treehugger
Change-Id: Iee1bdc0891b9fc7bd80a330495ec22a530febddb
Make it possible for code such as fdsan that generates debugging
tombstones via raise(DEBUGGER_SIGNAL) to pass an abort message as well.
Bug: http://b/112770187
Test: debuggerd_test
Change-Id: Idc34263241c18033573e466da3a45aa6f716ddb3
This commit only prints the raw value of the owner tag, pretty-printing
will come in a follow-up commit.
Test: debuggerd `pidof adbd`
Test: static_crasher fdsan_file + manual inspection of tombstone
Change-Id: Idb7375a12e410d5b51e6fcb6885d4beb20bccd0e
Pass the address of the fdsan table down to crash_dump so that we can
dump the fdsan table along with the open file descriptor list.
Test: debuggerd_test
Test: manually ran an old static_crasher
Change-Id: Icbac5487109f2db1e1061c4d46de11b016b299e3
