Memory leak in bitmap code? (was: QEMU | Pipeline #168317253 has failed for master | 9fc87111)

[Thomas Huth]

 Hi,

looks like the LeakSanitizer spotted a memory leak in the bitmap related
code ... not sure why it just triggered with Richard's pull request, and
I can also not reproduce it... But since there is a nice backtrace in it
and there have been some bitmap-related patches recently, could you
maybe have a look whether this rings a bell by any chance:

 https://gitlab.com/qemu-project/qemu/-/jobs/645799805#L3282

?

 Thanks,
  Thomas


On 19/07/2020 21.35, GitLab via wrote:
> GitLab
> ✖     Your pipeline has failed.
> 
>  
> Project       QEMU <https://gitlab.com/qemu-project> / QEMU
> <https://gitlab.com/qemu-project/qemu>
> Branch        
>       master <https://gitlab.com/qemu-project/qemu/-/commits/master>
> 
> Commit        
>       9fc87111
> <https://gitlab.com/qemu-project/qemu/-/commit/9fc87111005e8903785db40819af66b8f85b8b96>
> 
> 
> Merge remote-tracking branch 'remotes/rth/tags/...
> Commit Author         
>       Peter Maydell <https://gitlab.com/pm215>
> 
>  
> Pipeline #168317253
> <https://gitlab.com/qemu-project/qemu/-/pipelines/168317253>
> triggered by          Alex Bennée <https://gitlab.com/stsquad>
> 
> had 1 failed build.
> Logs may contain sensitive data. Please consider before forwarding this
> email.
> ✖     build
> 
>       build-fuzzer <https://gitlab.com/qemu-project/qemu/-/jobs/645799805>
> 
> ==11111==ERROR: LeakSanitizer: detected memory leaks
> 
> Direct leak of 2359296 byte(s) in 9 object(s) allocated from:
> #0 0x5570060105d7 in calloc
> (/builds/qemu-project/qemu/build/x86_64-softmmu/qemu-system-x86_64+0x2bdb5d7)
> #1 0x55700605ddf9 in bitmap_try_new
> /builds/qemu-project/qemu/include/qemu/bitmap.h:96:12
> #2 0x55700605ddf9 in bitmap_new
> /builds/qemu-project/qemu/include/qemu/bitmap.h:101:26
> #3 0x55700605ddf9 in dirty_memory_extend
> /builds/qemu-project/qemu/exec.c:2219:37
> #4 0x55700605ddf9 in ram_block_add /builds/qemu-project/qemu/exec.c:2268:9
> #5 0x5570060611b4 in qemu_ram_alloc_internal
> /builds/qemu-project/qemu/exec.c:2441:5
> #6 0x557006061567 in qemu_ram_alloc /builds/qemu-project/qemu/exec.c:2460:12
> #7 0x55700675d350 in memory_region_init_ram_shared_nomigrate
> /builds/qemu-project/qemu/softmmu/memory.c:1514:21
> #8 0x557006bdd127 in ram_backend_memory_alloc
> /builds/qemu-project/qemu/backends/hostmem-ram.c:30:5
> #9 0x557006bd9733 in host_memory_backend_memory_complete
> /builds/qemu-project/qemu/backends/hostmem.c:333:9
> #10 0x557007a20ffc in user_creatable_complete
> /builds/qemu-project/qemu/qom/object_interfaces.c:23:9
> #11 0x557007a2178a in user_creatable_add_type
> /builds/qemu-project/qemu/qom/object_interfaces.c:93:10
> #12 0x557007a219dc in user_creatable_add_dict
> /builds/qemu-project/qemu/qom/object_interfaces.c:134:11
> #13 0x557007ee7eb6 in qmp_dispatch
> /builds/qemu-project/qemu/qapi/qmp-dispatch.c:155:5
> #14 0x5570077452a8 in monitor_qmp_dispatch
> /builds/qemu-project/qemu/monitor/qmp.c:145:11
> #15 0x55700774411d in monitor_qmp_bh_dispatcher
> /builds/qemu-project/qemu/monitor/qmp.c:234:9
> #16 0x557008065c66 in aio_bh_poll
> /builds/qemu-project/qemu/util/async.c:164:13
> #17 0x55700800235c in aio_dispatch
> /builds/qemu-project/qemu/util/aio-posix.c:380:5
> #18 0x55700806a62c in aio_ctx_dispatch
> /builds/qemu-project/qemu/util/async.c:306:5
> #19 0x7f93662807ae in g_main_context_dispatch
> (/lib64/libglib-2.0.so.0+0x527ae)
> 
> SUMMARY: AddressSanitizer: 2359296 byte(s) leaked in 9 allocation(s).
> /builds/qemu-project/qemu/tests/qtest/libqtest.c:166: kill_qemu() tried
> to terminate QEMU process but encountered exit status 1 (expected 0)
> ERROR qmp-cmd-test - too few tests run (expected 51, got 50)
> make: *** [/builds/qemu-project/qemu/tests/Makefile.include:650:
> check-qtest-x86_64] Error 1
> ERROR: Job failed: exit code 1
> 
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