847268 - Provide partners on what information to get when device freezes

Status: RESOLVED FIXED

(Firefox OS Graveyard :: General, defect)

Comment 1

[Joe Cheng [:jcheng] (please needinfo)]

Alan, can you help to provide it? thanks

Comment 2

[Alan Huang]

Attachment: patch to enable minidump

Comment 3

[Alan Huang]

Attachment: Patch for run-gdb.sh to parse coredump

Comment 4

[Alan Huang]

Attachment: patch to enable coredump

Comment 5

[Alan Huang]

Attachment: patch to enable coredump (gecko)

Comment 6

[Alan Huang]

Attachment: minidump_stackwalk.tar.gz

Comment 7

[Alan Huang]

[Note] Use no optimization build to make sure symbols could be parsed correctly:
Add "export B2G_NOOPT=1" in .userconfig under b2g root folder.

If these are cases that b2g process still alive (using "adb shell b2g-ps" could still see process /system/b2g/b2g), then use gdb to get backtrace information:
./run-gdb.sh attach
(gdb) thread apply all bt
(and maybe more gdb debug commands...)

If these are cases that b2g process no longer exist (B2G process crash), then partners would need a build with coredump enabled or minidump enabled:

1. Use coredump (recommanded)
1-a. Enable coredump in boot.img. attachment 721597 [details] [diff] [review] is an example to enable it in init.rc (ramdisk)
1-b. Build gecko with attachment 721600 [details] [diff] [review] patch.
1-c. Apply attachment 721579 [details] [diff] [review] patch for run-gdb.sh to parse coredump
Then, if B2G process crashed, you could pull coredump from device and uses below command to debug:
./run-gdb.sh --coredump [PROGRAM] [COREDUMP FILE]
(Then use gdb debug commands...)

2. Use minidump
2-a. Apply attachment 721578 [details] [diff] [review] patch.
2-b. Make symbols: ". setup.sh && make buildsymbols"
2-c. Extract attachment 721602 [details] and put it under b2g root
Then, if B2G process crashed, you could pull minidump *.dmp file under /data/b2g/mozilla/Crash\ Reports/pending, and uses below command to parse debug information:
./minidump_stackwalk [dmpfile] objdir-gecko/dist/crashreporter-symbols/ > dmp_result.txt

Comment 8

[Joe Cheng [:jcheng] (please needinfo)]

Thanks Alan

Comment 9

[Alan Huang]

These patches are used to collect detailed information for partner engineering ROM debugging only. Please don't include them in user build/shipping ROM.

Comment 10

[ying.xu]

Can minidump and coredump both be enabled on b2g system?

Comment 11

[Alan Huang]

(In reply to ying.xu from comment #10)
> Can minidump and coredump both be enabled on b2g system?

No, you cannot have both enabled.

Comment 12

[James Zhang (Spreadtrum)]

(In reply to Alan Huang [:ahuang] from comment #11)
> (In reply to ying.xu from comment #10)
> > Can minidump and coredump both be enabled on b2g system?
> 
> No, you cannot have both enabled.

Ying, we'll build two version for monkey test.