* Re: memory leak in dma_buf_ioctl
[not found] <000000000000b68e04058e6a3421@google.com>
@ 2019-07-24 9:59 ` Dmitry Vyukov
2019-07-26 2:34 ` syzbot
1 sibling, 0 replies; 3+ messages in thread
From: Dmitry Vyukov @ 2019-07-24 9:59 UTC (permalink / raw)
To: syzbot, Sumit Semwal, linux-media, DRI, linaro-mm-sig
Cc: LKML, syzkaller-bugs
On Wed, Jul 24, 2019 at 11:48 AM syzbot
<syzbot+b2098bc44728a4efb3e9@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: abdfd52a Merge tag 'armsoc-defconfig' of git://git.kernel...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=131441d0600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d31de3d88059b7fa
> dashboard link: https://syzkaller.appspot.com/bug?extid=b2098bc44728a4efb3e9
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12526e58600000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161784f0600000
+drivers/dma-buf/dma-buf.c maintainers
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+b2098bc44728a4efb3e9@syzkaller.appspotmail.com
>
> executing program
> executing program
> executing program
> executing program
> executing program
> BUG: memory leak
> unreferenced object 0xffff888114034680 (size 32):
> comm "syz-executor110", pid 6894, jiffies 4294947136 (age 13.580s)
> hex dump (first 32 bytes):
> 00 64 6d 61 62 75 66 3a 00 00 00 00 00 00 00 00 .dmabuf:........
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<00000000d259834b>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
> [<00000000d259834b>] slab_post_alloc_hook /mm/slab.h:522 [inline]
> [<00000000d259834b>] slab_alloc /mm/slab.c:3319 [inline]
> [<00000000d259834b>] __do_kmalloc /mm/slab.c:3653 [inline]
> [<00000000d259834b>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
> [<00000000ab207ec1>] memdup_user+0x26/0xa0 /mm/util.c:165
> [<00000000c0909d36>] strndup_user+0x62/0x80 /mm/util.c:224
> [<00000000a34a2d25>] dma_buf_set_name /drivers/dma-buf/dma-buf.c:331
> [inline]
> [<00000000a34a2d25>] dma_buf_ioctl+0x60/0x1b0
> /drivers/dma-buf/dma-buf.c:391
> [<00000000d7817662>] vfs_ioctl /fs/ioctl.c:46 [inline]
> [<00000000d7817662>] file_ioctl /fs/ioctl.c:509 [inline]
> [<00000000d7817662>] do_vfs_ioctl+0x62a/0x810 /fs/ioctl.c:696
> [<00000000d24a671a>] ksys_ioctl+0x86/0xb0 /fs/ioctl.c:713
> [<00000000bd810f5d>] __do_sys_ioctl /fs/ioctl.c:720 [inline]
> [<00000000bd810f5d>] __se_sys_ioctl /fs/ioctl.c:718 [inline]
> [<00000000bd810f5d>] __x64_sys_ioctl+0x1e/0x30 /fs/ioctl.c:718
> [<000000005a8e86d5>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
> [<000000007d83529f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff888113b044a0 (size 32):
> comm "syz-executor110", pid 6895, jiffies 4294947728 (age 7.660s)
> hex dump (first 32 bytes):
> 00 64 6d 61 62 75 66 3a 00 00 00 00 00 00 00 00 .dmabuf:........
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<00000000d259834b>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
> [<00000000d259834b>] slab_post_alloc_hook /mm/slab.h:522 [inline]
> [<00000000d259834b>] slab_alloc /mm/slab.c:3319 [inline]
> [<00000000d259834b>] __do_kmalloc /mm/slab.c:3653 [inline]
> [<00000000d259834b>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
> [<00000000ab207ec1>] memdup_user+0x26/0xa0 /mm/util.c:165
> [<00000000c0909d36>] strndup_user+0x62/0x80 /mm/util.c:224
> [<00000000a34a2d25>] dma_buf_set_name /drivers/dma-buf/dma-buf.c:331
> [inline]
> [<00000000a34a2d25>] dma_buf_ioctl+0x60/0x1b0
> /drivers/dma-buf/dma-buf.c:391
> [<00000000d7817662>] vfs_ioctl /fs/ioctl.c:46 [inline]
> [<00000000d7817662>] file_ioctl /fs/ioctl.c:509 [inline]
> [<00000000d7817662>] do_vfs_ioctl+0x62a/0x810 /fs/ioctl.c:696
> [<00000000d24a671a>] ksys_ioctl+0x86/0xb0 /fs/ioctl.c:713
> [<00000000bd810f5d>] __do_sys_ioctl /fs/ioctl.c:720 [inline]
> [<00000000bd810f5d>] __se_sys_ioctl /fs/ioctl.c:718 [inline]
> [<00000000bd810f5d>] __x64_sys_ioctl+0x1e/0x30 /fs/ioctl.c:718
> [<000000005a8e86d5>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
> [<000000007d83529f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
> --
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: memory leak in dma_buf_ioctl
[not found] <000000000000b68e04058e6a3421@google.com>
2019-07-24 9:59 ` memory leak in dma_buf_ioctl Dmitry Vyukov
@ 2019-07-26 2:34 ` syzbot
2019-07-26 2:46 ` Steven Rostedt
1 sibling, 1 reply; 3+ messages in thread
From: syzbot @ 2019-07-26 2:34 UTC (permalink / raw)
To: bsingharora, coreteam, davem, dri-devel, duwe, dvyukov, kaber,
kadlec, linaro-mm-sig, linux-kernel, linux-media, mingo, mpe,
netdev, netfilter-devel, pablo, rostedt, sumit.semwal,
syzkaller-bugs
syzbot has bisected this bug to:
commit 04cf31a759ef575f750a63777cee95500e410994
Author: Michael Ellerman <mpe@ellerman.id.au>
Date: Thu Mar 24 11:04:01 2016 +0000
ftrace: Make ftrace_location_range() global
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=154293f4600000
start commit: abdfd52a Merge tag 'armsoc-defconfig' of git://git.kernel...
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=174293f4600000
console output: https://syzkaller.appspot.com/x/log.txt?x=134293f4600000
kernel config: https://syzkaller.appspot.com/x/.config?x=d31de3d88059b7fa
dashboard link: https://syzkaller.appspot.com/bug?extid=b2098bc44728a4efb3e9
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12526e58600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161784f0600000
Reported-by: syzbot+b2098bc44728a4efb3e9@syzkaller.appspotmail.com
Fixes: 04cf31a759ef ("ftrace: Make ftrace_location_range() global")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: memory leak in dma_buf_ioctl
2019-07-26 2:34 ` syzbot
@ 2019-07-26 2:46 ` Steven Rostedt
0 siblings, 0 replies; 3+ messages in thread
From: Steven Rostedt @ 2019-07-26 2:46 UTC (permalink / raw)
To: syzbot
Cc: bsingharora, coreteam, davem, dri-devel, duwe, dvyukov, kaber,
kadlec, linaro-mm-sig, linux-kernel, linux-media, mingo, mpe,
netdev, netfilter-devel, pablo, sumit.semwal, syzkaller-bugs
On Thu, 25 Jul 2019 19:34:01 -0700
syzbot <syzbot+b2098bc44728a4efb3e9@syzkaller.appspotmail.com> wrote:
> syzbot has bisected this bug to:
>
> commit 04cf31a759ef575f750a63777cee95500e410994
> Author: Michael Ellerman <mpe@ellerman.id.au>
> Date: Thu Mar 24 11:04:01 2016 +0000
>
> ftrace: Make ftrace_location_range() global
It's sad that I have yet to find a single syzbot bisect useful. Really?
setting a function from static to global will cause a memory leak in a
completely unrelated area of the kernel?
I'm about to set these to my /dev/null folder.
-- Steve
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=154293f4600000
> start commit: abdfd52a Merge tag 'armsoc-defconfig' of git://git.kernel...
> git tree: upstream
> final crash: https://syzkaller.appspot.com/x/report.txt?x=174293f4600000
> console output: https://syzkaller.appspot.com/x/log.txt?x=134293f4600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d31de3d88059b7fa
> dashboard link: https://syzkaller.appspot.com/bug?extid=b2098bc44728a4efb3e9
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12526e58600000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161784f0600000
>
> Reported-by: syzbot+b2098bc44728a4efb3e9@syzkaller.appspotmail.com
> Fixes: 04cf31a759ef ("ftrace: Make ftrace_location_range() global")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] <000000000000b68e04058e6a3421@google.com>
2019-07-24 9:59 ` memory leak in dma_buf_ioctl Dmitry Vyukov
2019-07-26 2:34 ` syzbot
2019-07-26 2:46 ` Steven Rostedt
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