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

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Message-ID: <000000000000463eb205cbdbea58@google.com>
Date:   Mon, 13 Sep 2021 01:04:32 -0700
From:   syzbot <syzbot+65454c239241d3d647da@...kaller.appspotmail.com>
To:     Qiang.Zhang@...driver.com, asml.silence@...il.com, axboe@...nel.dk,
        io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in create_io_worker

syzbot has found a reproducer for the following issue on:

HEAD commit:    f306b90c69ce Merge tag 'smp-urgent-2021-09-12' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14bc2715300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bb1c2ff5ae428ca6
dashboard link: https://syzkaller.appspot.com/bug?extid=65454c239241d3d647da
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=171d8963300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15b9ccdd300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+65454c239241d3d647da@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.120s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.180s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.230s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.290s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.340s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.400s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.450s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88811953fa80 (size 192):
  comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.500s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline]
    [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline]
    [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741
    [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline]
    [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873
    [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473
    [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940
    [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline]
    [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline]
    [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240
    [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882
    [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory