https://llvm.org/bugs/show_bug.cgi?id=26847
Bug ID: 26847
Summary: coverage flushing unlocks and closes file in the wrong
order
Product: compiler-rt
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: unassignedb...@nondot.org
Reporter: t...@cloudera.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
When using GCDA profiling, the flush process tries to flock/funlock the GCDA
files to prevent multi-process races. However, the code that closes the file
seems to be wrong: it calls 'unlock' on the file _after_ closing it, which
results in EBADF:
open("/tmp/test.gcda", O_RDWR) = -1 ENOENT (No such file or directory)
open("/tmp/test.gcda", O_RDWR|O_CREAT, 0644) = 3
flock(3, LOCK_EX) = 0
fcntl(3, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f2b2e397000
lseek(3, 0, SEEK_CUR) = 0
write(3, "adcg*204J\310\376B\0\0\0\1\5\0\0\0\0\0\0\0\211EN;\2\0\0\0"..., 124) =
124
close(3) = 0
munmap(0x7f2b2e397000, 4096) = 0
flock(3, LOCK_UN) = -1 EBADF (Bad file descriptor)
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