Messages in this thread | | | Subject | Re: tty: memory leak in tty_open | From | Peter Hurley <> | Date | Mon, 4 Apr 2016 12:37:09 -0700 |
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Hi Dmitry,
On 04/04/2016 01:56 AM, Dmitry Vyukov wrote: > Hello, > > The following program causes a memory leak:
Thanks for the report. This is the same problem fixed in 4.5 There was a merge snafu; Greg has the patch in his queue that fixes this for 4.6
Regards, Peter Hurley
> unreferenced object 0xffff8800643c3168 (size 2048): > comm "syz-executor", pid 29328, jiffies 4295358628 (age 32.380s) > hex dump (first 32 bytes): > 01 54 00 00 0c 00 00 00 88 27 e1 67 00 88 ff ff .T.......'.g.... > 88 1f 54 68 00 88 ff ff 40 b1 f0 86 ff ff ff ff ..Th....@....... > backtrace: > [<ffffffff86798093>] kmemleak_alloc+0x63/0xa0 mm/kmemleak.c:915 > [< inline >] kmemleak_alloc_recursive include/linux/kmemleak.h:47 > [< inline >] slab_post_alloc_hook mm/slab.h:406 > [< inline >] slab_alloc_node mm/slub.c:2602 > [< inline >] slab_alloc mm/slub.c:2610 > [<ffffffff817979a0>] kmem_cache_alloc_trace+0x160/0x3d0 mm/slub.c:2627 > [< inline >] kmalloc include/linux/slab.h:478 > [< inline >] kzalloc include/linux/slab.h:622 > [<ffffffff8304a748>] alloc_tty_struct+0x98/0x840 drivers/tty/tty_io.c:3156 > [<ffffffff8304af68>] tty_init_dev+0x78/0x4b0 drivers/tty/tty_io.c:1532 > [< inline >] tty_open_by_driver drivers/tty/tty_io.c:2066 > [<ffffffff8304c181>] tty_open+0xde1/0x1140 drivers/tty/tty_io.c:2114 > [<ffffffff81801fca>] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388 > [<ffffffff817ed6a2>] do_dentry_open+0x6a2/0xcb0 fs/open.c:736 > [<ffffffff817f0d7b>] vfs_open+0x17b/0x1f0 fs/open.c:853 > [< inline >] do_last fs/namei.c:3238 > [<ffffffff8182961b>] path_openat+0x51bb/0x5ce0 fs/namei.c:3374 > [<ffffffff8182d7be>] do_filp_open+0x18e/0x250 fs/namei.c:3409 > [<ffffffff817f14fc>] do_sys_open+0x1fc/0x420 fs/open.c:1020 > [< inline >] SYSC_open fs/open.c:1038 > [<ffffffff817f174d>] SyS_open+0x2d/0x40 fs/open.c:1033 > > > // autogenerated by syzkaller (http://github.com/google/syzkaller) > #include <pthread.h> > #include <sys/syscall.h> > #include <unistd.h> > > void* thr(void* arg) > { > syscall(SYS_open, "/dev/console", 0, 0, 0, 0); > return 0; > } > > int main() > { > int i; > pthread_t th[4]; > > for (i = 0; i < 4; i++) > pthread_create(&th[i], 0, thr, 0); > usleep(100); > return 0; > } > > > On commit 05cf8077e54b20dddb756eaa26f3aeb5c38dd3cf (Apr 1). >
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