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Don't log from inside the logger

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This deadlocks ProgressBar, e.g.

  # nix run --impure --no-substitute --store '/tmp/nix2?store=/foo' --expr 'derivation { builder = /nix/store/zi90rxslsm4mlr46l2xws1rm94g7pk8p-busybox-1.31.1-x86_64-unknown-linux-musl/bin/busybox; }'

leads to

  Thread 1 (Thread 0x7ffff6126e80 (LWP 12250)):
  #0  0x00007ffff7215d62 in __lll_lock_wait () from /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31/lib/libpthread.so.0
  #1  0x00007ffff720e721 in pthread_mutex_lock () from /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31/lib/libpthread.so.0
  #2  0x00007ffff7ad17fa in __gthread_mutex_lock (__mutex=0x6c5448) at /nix/store/h31cy7jm6g7cfqbhc5pm4rf9c53i3qfb-gcc-9.3.0/include/c++/9.3.0/x86_64-unknown-linux-gnu/bits/gthr-default.h:749
  #3  std::mutex::lock (this=0x6c5448) at /nix/store/h31cy7jm6g7cfqbhc5pm4rf9c53i3qfb-gcc-9.3.0/include/c++/9.3.0/bits/std_mutex.h:100
  #4  std::unique_lock<std::mutex>::lock (this=0x7fffffff09a8, this=0x7fffffff09a8) at /nix/store/h31cy7jm6g7cfqbhc5pm4rf9c53i3qfb-gcc-9.3.0/include/c++/9.3.0/bits/unique_lock.h:141
  #5  std::unique_lock<std::mutex>::unique_lock (__m=..., this=0x7fffffff09a8) at /nix/store/h31cy7jm6g7cfqbhc5pm4rf9c53i3qfb-gcc-9.3.0/include/c++/9.3.0/bits/unique_lock.h:71
  #6  nix::Sync<nix::ProgressBar::State, std::mutex>::Lock::Lock (s=0x6c5448, this=0x7fffffff09a0) at src/libutil/sync.hh:45
  #7  nix::Sync<nix::ProgressBar::State, std::mutex>::lock (this=0x6c5448) at src/libutil/sync.hh:85
  #8  nix::ProgressBar::logEI (this=0x6c5440, ei=...) at src/libmain/progress-bar.cc:131
  #9  0x00007ffff7608cfd in nix::Logger::logEI (ei=..., lvl=nix::lvlError, this=0x6c5440) at src/libutil/logging.hh:88
  #10 nix::getCodeLines (errPos=...) at src/libutil/error.cc:66
  #11 0x00007ffff76073f2 in nix::showErrorInfo (out=..., einfo=..., showTrace=<optimized out>) at /nix/store/h31cy7jm6g7cfqbhc5pm4rf9c53i3qfb-gcc-9.3.0/include/c++/9.3.0/optional:897
  #12 0x00007ffff7ad19e7 in nix::ProgressBar::logEI (this=0x6c5440, ei=...) at src/libmain/progress-bar.cc:134
  #13 0x00007ffff7ab9d10 in nix::Logger::logEI (ei=..., lvl=nix::lvlError, this=0x6c5440) at src/libutil/logging.hh:88
  #14 nix::handleExceptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::function<void ()>) (programName="/home/eelco/Dev/nix/outputs/out/bin/nix", fun=...) at src/libmain/shared.cc:328
  #15 0x000000000046226b in main (argc=<optimized out>, argv=<optimized out>) at /nix/store/h31cy7jm6g7cfqbhc5pm4rf9c53i3qfb-gcc-9.3.0/include/c++/9.3.0/ext/new_allocator.h:80
This commit is contained in:
Eelco Dolstra 2020-12-22 11:15:29 +01:00
parent 9fab14adbc
commit 724b7f4fb6
1 changed files with 21 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
src/libutil/error.cc
View file

@ -62,12 +62,8 @@ std::optional<LinesOfCode> getCodeLines(const ErrPos & errPos)
LinesOfCode loc;
try {
AutoCloseFD fd = open(errPos.file.c_str(), O_RDONLY | O_CLOEXEC);
if (!fd) {
logError(SysError("opening file '%1%'", errPos.file).info());
return std::nullopt;
}
else
{
if (!fd) return {};
// count the newlines.
int count = 0;
string line;
@ -77,21 +73,18 @@ std::optional<LinesOfCode> getCodeLines(const ErrPos & errPos)
line = readLine(fd.get());
++count;
if (count < pl)
{
;
}
else if (count == pl) {
else if (count == pl)
loc.prevLineOfCode = line;
} else if (count == pl + 1) {
else if (count == pl + 1)
loc.errLineOfCode = line;
} else if (count == pl + 2) {
else if (count == pl + 2) {
loc.nextLineOfCode = line;
break;
}
} while (true);
return loc;
}
}
catch (EndOfFile & eof) {
if (loc.errLineOfCode.has_value())
return loc;
@ -99,7 +92,6 @@ std::optional<LinesOfCode> getCodeLines(const ErrPos & errPos)
return std::nullopt;
}
catch (std::exception & e) {
printError("error reading nix file: %s\n%s", errPos.file, e.what());
return std::nullopt;
}
} else {