URL: <https://savannah.gnu.org/bugs/?60774>
Summary: make hangs on fcntl lock when using -O and stdout is /dev/null Project: make Submitted by: vapier Submitted on: Fri 11 Jun 2021 06:24:02 PM EDT Severity: 3 - Normal Item Group: None Status: None Privacy: Public Assigned to: None Open/Closed: Open Discussion Lock: Any Component Version: None Operating System: None Fixed Release: None Triage Status: None _______________________________________________________ Details: i can reproduce this with make 4.2.1, 4.3, and current git (012918bf11fbc2a94dc2319d15d05595c351b811) on Debian/Ubuntu systems. my reproduction: $ wget https://busybox.net/downloads/busybox-1.32.1.tar.bz2 $ tar xf busybox-1.32.1.tar.bz2 $ cd busybox-1.32.1 # This works fine. $ make -O -j32 defconfig # This hangs indefinitely. $ make -O -j32 defconfig >/dev/null gdb shows the hang in: (gdb) bt #0 0x00007f10555c9643 in fcntl64 () from /lib64/libc.so.6 #1 0x00000000002225ff in acquire_semaphore () at output.c:267 #2 output_dump (out=out@entry=0x13a9744) at output.c:368 #3 0x000000000021b43a in reap_children (block=block@entry=0x1, err=<optimized out>, err@entry=0x0) at job.c:937 #4 0x0000000000227c99 in update_goal_chain (goaldeps=<optimized out>) at remake.c:112 #5 0x000000000021fa1b in main (argc=0x5, argv=0x7ffdd42b3478, envp=0x7ffdd42b34a8) at main.c:2558 (gdb) f 1 #1 0x00000000002225ff in acquire_semaphore () at output.c:267 267 if (fcntl (sync_handle, F_SETLKW, &fl) != -1) (gdb) list 262 263 fl.l_type = F_WRLCK; 264 fl.l_whence = SEEK_SET; 265 fl.l_start = 0; 266 fl.l_len = 1; 267 if (fcntl (sync_handle, F_SETLKW, &fl) != -1) 268 return &fl; 269 perror ("fcntl()"); 270 return NULL; 271 } strace confirms it: 286807 fcntl(1, F_SETLKW, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0, l_len=1} full strace log attached in case it helps. _______________________________________________________ File Attachments: ------------------------------------------------------- Date: Fri 11 Jun 2021 06:24:02 PM EDT Name: log.xz Size: 443KiB By: vapier <http://savannah.gnu.org/bugs/download.php?file_id=51549> _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?60774> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/