diff options
| author |   Richard Weinberger <richard@nod.at> | 2014-07-20 13:16:20 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2014-07-20 13:16:20 +0200 |
| commit | 468f65976a8d065ee1f27782337f4ee85a9151c5 (patch) | |
| tree | bf7325540763882142df28d23b4974e8e280d04b /arch | |
| parent | um: Ensure that a stub page cannot get unmapped (diff) | |
| download | linux-dev-468f65976a8d065ee1f27782337f4ee85a9151c5.tar.xz linux-dev-468f65976a8d065ee1f27782337f4ee85a9151c5.zip | |
um: Fix hung task in fix_range_common()
If do_ops() fails we have to release current->mm->mmap_sem
otherwise the failing task will never terminate.
Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/um/kernel/tlb.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c index 1fc619e5dfe9..f1b3eb14b855 100644 --- a/arch/um/kernel/tlb.c +++ b/arch/um/kernel/tlb.c @@ -12,6 +12,7 @@ #include <mem_user.h> #include <os.h> #include <skas.h> +#include <kern_util.h> struct host_vm_change { struct host_vm_op { @@ -286,8 +287,11 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr, /* This is not an else because ret is modified above */ if (ret) { printk(KERN_ERR "fix_range_common: failed, killing current " - "process\n"); + "process: %d\n", task_tgid_vnr(current)); + /* We are under mmap_sem, release it such that current can terminate */ + up_write(¤t->mm->mmap_sem); force_sig(SIGKILL, current); + do_signal(); } } |