Re: [syzbot] memory leak in io_submit_sqes (4)

Pavel Begunkov <asml.silence@xxxxxxxxx> · Mon, 9 Jan 2023 13:09:29 +0000

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@xxxxxxxxxxxxxxxxxxxxxxxxx

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

---
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--
Pavel Begunkov