linux-kernel - Re: [syzbot] memory leak in io_submit

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Date:   Mon, 9 Jan 2023 13:09:29 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     syzbot <syzbot+6c95df01470a47fc3af4@...kaller.appspotmail.com>,
        axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in io_submit_sqes (4)

On 1/9/23 06:03, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:

#syz test: git://git.kernel.dk/linux.git syztest


> HEAD commit:    0a71553536d2 Merge tag 'drm-fixes-2023-01-06' of git://ano..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=164951c2480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5ddca4921a53cff2
> dashboard link: https://syzkaller.appspot.com/bug?extid=6c95df01470a47fc3af4
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12929d9a480000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=105ffae2480000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/ad52353dc15f/disk-0a715535.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/90927b7e9870/vmlinux-0a715535.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/553a64766dcc/bzImage-0a715535.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6c95df01470a47fc3af4@...kaller.appspotmail.com
> 
> executing program
> executing program
> executing program
> executing program
> executing program
> BUG: memory leak
> unreferenced object 0xffff88810de89200 (size 256):
>    comm "syz-executor286", pid 5100, jiffies 4294952261 (age 14.130s)
>    hex dump (first 32 bytes):
>      00 8f 90 0a 81 88 ff ff 00 00 00 00 00 00 00 00  ................
>      00 00 00 00 00 00 00 00 00 40 00 00 00 00 00 00  .........@......
>    backtrace:
>      [<ffffffff84769af3>] __io_alloc_req_refill+0x55/0x193 io_uring/io_uring.c:1040
>      [<ffffffff8476b084>] io_alloc_req_refill io_uring/io_uring.h:378 [inline]
>      [<ffffffff8476b084>] io_submit_sqes.cold+0x65/0x8a io_uring/io_uring.c:2384
>      [<ffffffff823986bd>] __do_sys_io_uring_enter+0x76d/0x1490 io_uring/io_uring.c:3345
>      [<ffffffff848ef735>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>      [<ffffffff848ef735>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>      [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> BUG: memory leak
> unreferenced object 0xffff888109cac600 (size 96):
>    comm "syz-executor286", pid 5100, jiffies 4294952261 (age 14.130s)
>    hex dump (first 32 bytes):
>      00 8f 90 0a 81 88 ff ff 00 00 00 00 00 00 00 00  ................
>      7b 20 00 c0 00 00 00 00 00 00 00 00 00 00 00 00  { ..............
>    backtrace:
>      [<ffffffff814f94a0>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1062
>      [<ffffffff823a702c>] kmalloc include/linux/slab.h:580 [inline]
>      [<ffffffff823a702c>] io_req_alloc_apoll io_uring/poll.c:650 [inline]
>      [<ffffffff823a702c>] io_arm_poll_handler+0x1fc/0x470 io_uring/poll.c:694
>      [<ffffffff82395e4d>] io_queue_async+0x8d/0x2e0 io_uring/io_uring.c:2006
>      [<ffffffff82397b98>] io_queue_sqe io_uring/io_uring.c:2037 [inline]
>      [<ffffffff82397b98>] io_submit_sqe io_uring/io_uring.c:2286 [inline]
>      [<ffffffff82397b98>] io_submit_sqes+0x968/0xb70 io_uring/io_uring.c:2397
>      [<ffffffff823986bd>] __do_sys_io_uring_enter+0x76d/0x1490 io_uring/io_uring.c:3345
>      [<ffffffff848ef735>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>      [<ffffffff848ef735>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>      [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> BUG: memory leak
> unreferenced object 0xffff88810a72bb00 (size 256):
>    comm "syz-executor286", pid 5100, jiffies 4294952261 (age 14.130s)
>    hex dump (first 32 bytes):
>      00 8f 90 0a 81 88 ff ff 00 00 00 00 00 00 00 00  ................
>      00 00 00 00 00 00 00 00 00 40 00 00 00 00 00 00  .........@......
>    backtrace:
>      [<ffffffff84769af3>] __io_alloc_req_refill+0x55/0x193 io_uring/io_uring.c:1040
>      [<ffffffff8476b084>] io_alloc_req_refill io_uring/io_uring.h:378 [inline]
>      [<ffffffff8476b084>] io_submit_sqes.cold+0x65/0x8a io_uring/io_uring.c:2384
>      [<ffffffff823986bd>] __do_sys_io_uring_enter+0x76d/0x1490 io_uring/io_uring.c:3345
>      [<ffffffff848ef735>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>      [<ffffffff848ef735>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>      [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> BUG: memory leak
> unreferenced object 0xffff88810f18f600 (size 96):
>    comm "syz-executor286", pid 5100, jiffies 4294952261 (age 14.130s)
>    hex dump (first 32 bytes):
>      00 8f 90 0a 81 88 ff ff 00 00 00 00 00 00 00 00  ................
>      7b 20 00 c0 00 00 00 00 00 00 00 00 00 00 00 00  { ..............
>    backtrace:
>      [<ffffffff814f94a0>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1062
>      [<ffffffff823a702c>] kmalloc include/linux/slab.h:580 [inline]
>      [<ffffffff823a702c>] io_req_alloc_apoll io_uring/poll.c:650 [inline]
>      [<ffffffff823a702c>] io_arm_poll_handler+0x1fc/0x470 io_uring/poll.c:694
>      [<ffffffff82395e4d>] io_queue_async+0x8d/0x2e0 io_uring/io_uring.c:2006
>      [<ffffffff82397b98>] io_queue_sqe io_uring/io_uring.c:2037 [inline]
>      [<ffffffff82397b98>] io_submit_sqe io_uring/io_uring.c:2286 [inline]
>      [<ffffffff82397b98>] io_submit_sqes+0x968/0xb70 io_uring/io_uring.c:2397
>      [<ffffffff823986bd>] __do_sys_io_uring_enter+0x76d/0x1490 io_uring/io_uring.c:3345
>      [<ffffffff848ef735>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>      [<ffffffff848ef735>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>      [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> 
> 
> ---
> This report 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@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches

-- 
Pavel Begunkov