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Red Hat Bugzilla – Attachment 885111 Details for
Bug 1086404
kernel crash from lockdep resource exhaustion, due to heavy module heap/lock activity
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a demonstration module
foo.c (text/plain), 887 bytes, created by
Frank Ch. Eigler
on 2014-04-10 19:51:19 UTC
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Description:
a demonstration module
Filename:
MIME Type:
Creator:
Frank Ch. Eigler
Created:
2014-04-10 19:51:19 UTC
Size:
887 bytes
patch
obsolete
>#include <linux/version.h> >#include <generated/autoconf.h> >#include <linux/module.h> /* Needed by all modules */ >#include <linux/kernel.h> /* Needed for KERN_INFO */ >#include <linux/init.h> >#include <linux/slab.h> >#include <linux/sched.h> > >struct foo { > rwlock_t zoo; > spinlock_t poo; >}; > >int init_module(void) >{ > struct foo* k = (struct foo *) vmalloc(sizeof(struct foo)); > if (!k) return -ENOMEM; > > rwlock_init(& k->zoo); > spin_lock_init(& k->poo); > > down_read(& current->mm->mmap_sem); > write_lock(& k->zoo); > spin_lock(& k->poo); > spin_unlock(& k->poo); > write_unlock(& k->zoo); > up_read(& current->mm->mmap_sem); > > vfree (k); > > printk(KERN_INFO "hello %p\n", k); > > return 0; >} > >void cleanup_module(void) >{ >} > >// module_init(init_hello); >// module_exit(cleanup_hello); > >MODULE_LICENSE("GPL"); >MODULE_AUTHOR("foo bar"); >MODULE_DESCRIPTION("baz");
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bug 1086404
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