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-rw-r--r--libpod/lock/shm/shm_lock.go11
1 files changed, 10 insertions, 1 deletions
diff --git a/libpod/lock/shm/shm_lock.go b/libpod/lock/shm/shm_lock.go
index 322e92a8f..fea02a619 100644
--- a/libpod/lock/shm/shm_lock.go
+++ b/libpod/lock/shm/shm_lock.go
@@ -130,8 +130,17 @@ func (locks *SHMLocks) AllocateSemaphore() (uint32, error) {
// semaphore indexes, and can still return error codes.
retCode := C.allocate_semaphore(locks.lockStruct)
if retCode < 0 {
+ var err = syscall.Errno(-1 * retCode)
// Negative errno returned
- return 0, syscall.Errno(-1 * retCode)
+ if errors.Is(err, syscall.ENOSPC) {
+ // ENOSPC expands to "no space left on device". While it is technically true
+ // that there's no room in the SHM inn for this lock, this tends to send normal people
+ // down the path of checking disk-space which is not actually their problem.
+ // Give a clue that it's actually due to num_locks filling up.
+ var errFull = errors.Errorf("allocation failed; exceeded num_locks (%d)", locks.maxLocks)
+ return uint32(retCode), errFull
+ }
+ return uint32(retCode), syscall.Errno(-1 * retCode)
}
return uint32(retCode), nil