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authorJeff Dike <jdike@addtoit.com>2006-09-25 23:33:03 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 08:49:07 -0700
commit6edf428ed177e333863a8e5c37751a9ec176f241 (patch)
treecf7f3e70f4898d55dbbdbd982353057e4ef3babd
parent6b7aaad9ba4f2a059a70014be12a921eceebfc47 (diff)
[PATCH] uml: Improve SIGBUS diagnostics
UML can get a SIGBUS anywhere if the tmpfs mount being used for its memory runs out of space. This patch adds a printk before the panic to provide a clue as to what likely went wrong. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/um/kernel/trap.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index ac70fa5a2e2..e5eeaf2b6af 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -227,9 +227,16 @@ void bad_segv(struct faultinfo fi, unsigned long ip)
void relay_signal(int sig, union uml_pt_regs *regs)
{
- if(arch_handle_signal(sig, regs)) return;
- if(!UPT_IS_USER(regs))
+ if(arch_handle_signal(sig, regs))
+ return;
+
+ if(!UPT_IS_USER(regs)){
+ if(sig == SIGBUS)
+ printk("Bus error - the /dev/shm or /tmp mount likely "
+ "just ran out of space\n");
panic("Kernel mode signal %d", sig);
+ }
+
current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
force_sig(sig, current);
}