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executor/linux: report large files when exiting with ENOSPC error #2127

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executor/linux: report large files when exiting with ENOSPC error #2127

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38 changes: 38 additions & 0 deletions executor/executor.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1478,6 +1478,42 @@ void setup_features(char** enable, int n)
}
}

#if GOOS_linux
#include <ftw.h>
#include <sys/vfs.h>

static int nftw_callback(const char* fpath, const struct stat* sbuf, int tflag, struct FTW* ftwbuf)
{
static char buffer[4096] = {};
static struct stat sbuf2 = {};

if (S_ISLNK(sbuf->st_mode) && strstr(fpath, "/fd/") && !stat(fpath, &sbuf2) &&
(unsigned long long)sbuf2.st_blocks >= 1048576ULL / 512)
fprintf(stderr, "%10llu %s\n", (unsigned long long)sbuf2.st_size,
readlink(fpath, buffer, sizeof(buffer) - 1) > 0 ? buffer : fpath);
return 0;
}
#endif

static void check_large_files(int err)
{
#if GOOS_linux
char buffer[4096] = {};
struct statfs sbuf = {};

if (err != ENOSPC)
return;
fprintf(stderr, "Current directory is %s\n", getcwd(buffer, sizeof(buffer) - 1));
statfs(".", &sbuf);
fprintf(stderr, " Free blocks: %llu/%llu\n", (unsigned long long)sbuf.f_bfree, (unsigned long long)sbuf.f_blocks);
fprintf(stderr, " Block size: %llu\n", (unsigned long long)sbuf.f_bsize);
fprintf(stderr, " Filesystem type: %lx\n", (unsigned long)sbuf.f_type);
fprintf(stderr, " Free inodes: %llu/%llu\n", (unsigned long long)sbuf.f_ffree, (unsigned long long)sbuf.f_files);
fprintf(stderr, "Scanning large files from /proc/\052/fd/\052\n");
nftw("/proc/", nftw_callback, 512, FTW_DEPTH | FTW_PHYS | FTW_MOUNT);
#endif
}

void fail(const char* msg, ...)
{
int e = errno;
Expand All @@ -1486,6 +1522,7 @@ void fail(const char* msg, ...)
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, " (errno %d)\n", e);
check_large_files(e);

// fail()'s are often used during the validation of kernel reactions to queries
// that were issued by pseudo syscalls implementations. As fault injection may
Expand All @@ -1511,6 +1548,7 @@ void exitf(const char* msg, ...)
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, " (errno %d)\n", e);
check_large_files(e);
doexit(0);
}

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