Re: [bug report] kmemleak in rdma_core observed during blktests nvme/rdma use siw

[Leon Romanovsky <leonro@nvidia.com>]

On Mon, Apr 08, 2024 at 09:39:07AM +0300, Leon Romanovsky wrote:
> On Mon, Apr 08, 2024 at 02:03:51PM +0800, Yi Zhang wrote:
> > Hi
> > I found the below kmemleak issue during blktests nvme/rdma on the
> > latest linux-rdma/for-next, please help check it and let me know if
> > you need any info/testing for it, thanks.
> > 
> > # dmesg | grep kmemleak
> > [   67.130652] kmemleak: Kernel memory leak detector initialized (mem
> > pool available: 36041)
> > [   67.130728] kmemleak: Automatic memory scanning thread started
> > [ 1051.771867] kmemleak: 2 new suspected memory leaks (see
> > /sys/kernel/debug/kmemleak)
> > [ 1832.796189] kmemleak: 8 new suspected memory leaks (see
> > /sys/kernel/debug/kmemleak)
> > [ 2578.189075] kmemleak: 17 new suspected memory leaks (see
> > /sys/kernel/debug/kmemleak)
> > [ 3330.710984] kmemleak: 4 new suspected memory leaks (see
> > /sys/kernel/debug/kmemleak)
> > 
> > unreferenced object 0xffff88855da53400 (size 192):
> >   comm "rdma", pid 10630, jiffies 4296575922
> >   hex dump (first 32 bytes):
> >     37 00 00 00 00 00 00 00 c0 ff ff ff 1f 00 00 00  7...............
> >     10 34 a5 5d 85 88 ff ff 10 34 a5 5d 85 88 ff ff  .4.].....4.]....
> >   backtrace (crc 47f66721):
> >     [<ffffffff911251bd>] kmalloc_trace+0x30d/0x3b0
> >     [<ffffffffc2640ff7>] alloc_gid_entry+0x47/0x380 [ib_core]
> >     [<ffffffffc2642206>] add_modify_gid+0x166/0x930 [ib_core]
> >     [<ffffffffc2643468>] ib_cache_update.part.0+0x6d8/0x910 [ib_core]
> >     [<ffffffffc2644e1a>] ib_cache_setup_one+0x24a/0x350 [ib_core]
> >     [<ffffffffc263949e>] ib_register_device+0x9e/0x3a0 [ib_core]
> >     [<ffffffffc2a3d389>] 0xffffffffc2a3d389
> >     [<ffffffffc2688cd8>] nldev_newlink+0x2b8/0x520 [ib_core]
> 
> My guess is that your test didn't call too nldev_dellink() and left
> device registered.

Sorry, I was wrong, it looks like GID entry leak.

Thanks

> 
> Thanks
> 
> >     [<ffffffffc2645fe3>] rdma_nl_rcv_msg+0x2c3/0x520 [ib_core]
> >     [<ffffffffc264648c>]
> > rdma_nl_rcv_skb.constprop.0.isra.0+0x23c/0x3a0 [ib_core]
> >     [<ffffffff9270e7b5>] netlink_unicast+0x445/0x710
> >     [<ffffffff9270f1f1>] netlink_sendmsg+0x761/0xc40
> >     [<ffffffff9249db29>] __sys_sendto+0x3a9/0x420
> >     [<ffffffff9249dc8c>] __x64_sys_sendto+0xdc/0x1b0
> >     [<ffffffff92db0ad3>] do_syscall_64+0x93/0x180
> >     [<ffffffff92e00126>] entry_SYSCALL_64_after_hwframe+0x71/0x79
> > 
> > -- 
> > Best Regards,
> >   Yi Zhang
> > 
> > 
>