[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [BUG] libxl_ctx_free calls close(0)
Hello, it seems that libxl_ctx_free always calls close(0) for some reason, even if libxl never opens file descriptor 0. It sometimes closes valid descriptor in application causing random and hard to debug I/O errors. The following simple program can be used to reproduce this bug: #include <stdio.h> #include <libxl.h> static void LogMessage(struct xentoollog_logger *logger, xentoollog_level level, int errnoval /* or -1 */, const char *context /* eg "xc", "xl", may be 0 */, const char *format /* without level, context, \n */, va_list al) { } static void LogProgress(struct xentoollog_logger *logger, const char *context /* see above */, const char *doing_what /* no \r,\n */, int percent, unsigned long done, unsigned long total) { } static void LogDestroy(struct xentoollog_logger *logger) { } int main(int argc, char *argv[]) { xentoollog_logger logger; logger.vmessage = LogMessage; logger.progress = LogProgress; logger.destroy = LogDestroy; libxl_ctx *ctx; int rc = libxl_ctx_alloc(&ctx, LIBXL_VERSION, 0, &logger); if (rc != 0) { printf("libxl_ctx_alloc failed (%d)\n", rc); return 1; } libxl_ctx_free(ctx); return 0; } Strace output for it is following (I omit shared library loading on startup): set_tid_address(0x7f787db29a50) = 17944 set_robust_list(0x7f787db29a60, 24) = 0 rt_sigaction(SIGRTMIN, {0x7f787c4809b0, [], SA_RESTORER|SA_SIGINFO, 0x7f787c489890}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {0x7f787c480a40, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7f787c489890}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 brk(0) = 0x156d000 brk(0x158e000) = 0x158e000 pipe([3, 4]) = 0 fcntl(3, F_GETFL) = 0 (flags O_RDONLY) fcntl(3, F_SETFL, O_RDONLY|O_NONBLOCK) = 0 fcntl(4, F_GETFL) = 0x1 (flags O_WRONLY) fcntl(4, F_SETFL, O_WRONLY|O_NONBLOCK) = 0 open("/proc/xen/privcmd", O_RDWR) = 5 fcntl(5, F_GETFD) = 0 fcntl(5, F_SETFD, FD_CLOEXEC) = 0 stat("/var/run/xenstored/socket", {st_mode=S_IFSOCK|0600, st_size=0, ...}) = 0 socket(PF_LOCAL, SOCK_STREAM, 0) = 6 fcntl(6, F_GETFD) = 0 fcntl(6, F_SETFD, FD_CLOEXEC) = 0 connect(6, {sa_family=AF_LOCAL, sun_path="/var/run/xenstored/socket"}, 110) = 0 close(5) = 0 close(6) = 0 close(3) = 0 close(4) = 0 close(0) = 0 exit_group(0) = ? +++ exited with 0 +++ Best regards, Victor Kirhenshtein _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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