Messages in this thread | | | From | Dmitry Vyukov <> | Date | Fri, 20 Nov 2015 17:16:06 +0100 | Subject | another uninterruptable hang in sendfile |
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Hello,
On commit 8005c49d9aea74d382f474ce11afbbc7d7130bec (Nov 15).
The program is:
// autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include <unistd.h> #include <sys/syscall.h> #include <sys/eventfd.h> #include <sys/sendfile.h> #include <fcntl.h>
#define SYS_memfd_create 319
int main() { int r1 = eventfd(0, 0); int r2 = syscall(SYS_memfd_create, "", 0); unsigned long n = 1<<30; fallocate(r2, 0, 0, n); sendfile(r1, r2, 0, n); return 0; }
It can be executed under non-privileged user and creates an unkillable process. It probably will terminate eventually, but it can take days/weeks. Note that "mm: make sendfile(2) killable" 296291cdd1629c308114504b850dc343eabc2782 is merged, so it is something different. Though, probably similar.
Thank you.
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