Jasper Bryant-Greene <jasper@xxxxxxxxxxxx> wrote:
> This occurs on my x86_64 system, config was posted to this thread
> earlier.
Does it happen every time? I took your config modified it very slightly so
that it'd work on my system:
-CONFIG_INITRAMFS_SOURCE="/usr/share/v86d/initramfs"
-CONFIG_INITRAMFS_ROOT_UID=0
-CONFIG_INITRAMFS_ROOT_GID=0
+CONFIG_INITRAMFS_SOURCE=""
-CONFIG_PACKET=m
+CONFIG_PACKET=y
-CONFIG_UNIX=m
+CONFIG_UNIX=y
-CONFIG_NET_KEY=m
+CONFIG_NET_KEY=y
-CONFIG_E1000E=m
+CONFIG_E1000E=y
-# CONFIG_SERIAL_8250 is not set
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_PCI=y
+CONFIG_SERIAL_8250_PNP=y
+CONFIG_SERIAL_8250_NR_UARTS=4
+CONFIG_SERIAL_8250_RUNTIME_UARTS=4
+# CONFIG_SERIAL_8250_EXTENDED is not set
+CONFIG_SERIAL_CORE=y
+CONFIG_SERIAL_CORE_CONSOLE=y
-# CONFIG_EXT3_FS is not set
+CONFIG_EXT3_FS=y
+CONFIG_EXT3_FS_XATTR=y
+CONFIG_EXT3_FS_POSIX_ACL=y
+CONFIG_EXT3_FS_SECURITY=y
+CONFIG_JBD=y
+# CONFIG_JBD_DEBUG is not set
None of which should make a difference, but the kernel works fine and survives
the LTP syscalls testscript:-/
Hmmm... There is a possibility, I suppose. The only place in the fork path
that I know of that returns EAGAIN is this bit:
retval = -EAGAIN;
if (atomic_read(&p->real_cred->user->processes) >=
p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
p->real_cred->user != current->nsproxy->user_ns->root_user)
goto bad_fork_free;
}
Are you running as an unprivileged user? If so, this may be the point that's
biting you. Can you try applying the attached patch to find more information?
David
---
Add printks to find problem
From: David Howells <dhowells@xxxxxxxxxx>
---
kernel/fork.c | 16 +++++++++++++---
1 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index eb7838d..4d52954 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -920,8 +920,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
return ERR_PTR(-EINVAL);
retval = security_task_create(clone_flags);
- if (retval)
+ if (retval) {
+ printk(KERN_ERR "security_task_create() returned %d\n", retval);
goto fork_out;
+ }
retval = -ENOMEM;
p = dup_task_struct(current);
@@ -938,13 +940,20 @@ static struct task_struct *copy_process(unsigned long clone_flags,
if (atomic_read(&p->real_cred->user->processes) >=
p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
- p->real_cred->user != current->nsproxy->user_ns->root_user)
+ p->real_cred->user != current->nsproxy->user_ns->root_user) {
+ printk(KERN_ERR "Rlimit EAGAIN (%d >= %lu, uid %d)\n",
+ atomic_read(&p->real_cred->user->processes),
+ p->signal->rlim[RLIMIT_NPROC].rlim_cur,
+ p->real_cred->user->uid);
goto bad_fork_free;
+ }
}
retval = copy_creds(p, clone_flags);
- if (retval < 0)
+ if (retval < 0) {
+ printk(KERN_ERR "copy_creds() returned %d\n", retval);
goto bad_fork_free;
+ }
/*
* If multiple threads are within copy_process(), then this check
@@ -1274,6 +1283,7 @@ bad_fork_cleanup_count:
bad_fork_free:
free_task(p);
fork_out:
+ printk(KERN_ERR "copy_process() = %d\n", retval);
return ERR_PTR(retval);
}
--
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