The patch titled
um: print info about fatal segfaults
has been added to the -mm tree. Its filename is
um-print-info-about-fatal-segfaults.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: um: print info about fatal segfaults
From: Richard Weinberger <richard@xxxxxx>
Print a short info about fatal segfaults like other archs do.
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/um/kernel/trap.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff -puN arch/um/kernel/trap.c~um-print-info-about-fatal-segfaults arch/um/kernel/trap.c
--- a/arch/um/kernel/trap.c~um-print-info-about-fatal-segfaults
+++ a/arch/um/kernel/trap.c
@@ -113,6 +113,27 @@ out_of_memory:
return 0;
}
+static void show_segv_info(struct uml_pt_regs *regs)
+{
+ struct task_struct *tsk = current;
+ struct faultinfo *fi = UPT_FAULTINFO(regs);
+
+ if (!unhandled_signal(tsk, SIGSEGV))
+ return;
+
+ if (!printk_ratelimit())
+ return;
+
+ printk("%s%s[%d]: segfault at %lx ip %p sp %p error %x",
+ task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+ tsk->comm, task_pid_nr(tsk), FAULT_ADDRESS(*fi),
+ (void *)UPT_IP(regs), (void *)UPT_SP(regs),
+ fi->error_code);
+
+ print_vma_addr(KERN_CONT " in ", UPT_IP(regs));
+ printk(KERN_CONT "\n");
+}
+
static void bad_segv(struct faultinfo fi, unsigned long ip)
{
struct siginfo si;
@@ -141,6 +162,7 @@ void segv_handler(int sig, struct uml_pt
struct faultinfo * fi = UPT_FAULTINFO(regs);
if (UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)) {
+ show_segv_info(regs);
bad_segv(*fi, UPT_IP(regs));
return;
}
@@ -202,6 +224,8 @@ unsigned long segv(struct faultinfo fi,
address, ip);
}
+ show_segv_info(regs);
+
if (err == -EACCES) {
si.si_signo = SIGBUS;
si.si_errno = 0;
_
Patches currently in -mm which might be from richard@xxxxxx are
origin.patch
mm-mmu_gather-rework.patch
powerpc-mmu_gather-rework.patch
sparc-mmu_gather-rework.patch
s390-mmu_gather-rework.patch
arm-mmu_gather-rework.patch
sh-mmu_gather-rework.patch
ia64-mmu_gather-rework.patch
um-mmu_gather-rework.patch
mm-now-that-all-old-mmu_gather-code-is-gone-remove-the-storage.patch
mm-powerpc-move-the-rcu-page-table-freeing-into-generic-code.patch
mm-extended-batches-for-generic-mmu_gather.patch
lockdep-mutex-provide-mutex_lock_nest_lock.patch
mm-remove-i_mmap_lock-lockbreak.patch
mm-convert-i_mmap_lock-to-a-mutex.patch
mm-revert-page_lock_anon_vma-lock-annotation.patch
mm-improve-page_lock_anon_vma-comment.patch
mm-use-refcounts-for-page_lock_anon_vma.patch
mm-convert-anon_vma-lock-to-a-mutex.patch
mm-optimize-page_lock_anon_vma-fast-path.patch
um-os_dump_core-cleanup.patch
um-fix-uml_lib_path.patch
um-remove-sighup-handler.patch
um-add-earlyprintk-support.patch
um-add-ucast-ethernet-transport.patch
um-print-info-about-fatal-segfaults.patch
um-include-linux-prefetchh.patch
um-fix-crash-while-os_dump_core.patch
remove-unused-proc_change_penalty-constant.patch
lib-consolidate-debug_stack_usage-option.patch
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