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Subject[PATCH 1/2] um: Fix call tracer and bug handler
Commit 1de1502c (x86, um: now we can get rid of trivial uml headers)
removed accidentally bug.h which broke UML's call tracer and
bug handler.
Without asm-generic/bug.h UML uses BUG() from arch/x86/
which makes use of ud2.
UML cannot use ud2, it raises SIGILL in user mode.
As UML has a different stack for handling signals the call trace
will be cut off.

Reported-by: Sergei Trofimovich <>
Tested-by: Sergei Trofimovich <>
Signed-off-by: Richard Weinberger <>
arch/um/include/asm/bug.h | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
create mode 100644 arch/um/include/asm/bug.h

diff --git a/arch/um/include/asm/bug.h b/arch/um/include/asm/bug.h
new file mode 100644
index 0000000..9e33b86
--- /dev/null
+++ b/arch/um/include/asm/bug.h
@@ -0,0 +1,6 @@
+#ifndef __UM_BUG_H
+#define __UM_BUG_H
+#include <asm-generic/bug.h>

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