[syzbot] memory leak in blk_iolatency_init
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syzbot
Sep 13, 2021, 7:28:26 PM9/13/21
to ax...@kernel.dk, cgr...@vger.kernel.org, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, t...@kernel.org
Hello,
syzbot found the following issue on:
HEAD commit: a3fa7a101dcf Merge branches 'akpm' and 'akpm-hotfixes' (pa..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12b4a5b3300000
kernel config: https://syzkaller.appspot.com/x/.config?x=9ee3a4c022ccbbca
dashboard link: https://syzkaller.appspot.com/bug?extid=01321b15cc98e6bf96d6
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=148c170b300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+01321b...@syzkaller.appspotmail.com
2021/09/09 22:14:31 executed programs: 444
BUG: memory leak
unreferenced object 0xffff888129acdb80 (size 96):
comm "syz-executor.1", pid 12661, jiffies 4294962682 (age 15.220s)
hex dump (first 32 bytes):
20 47 c9 85 ff ff ff ff 20 d4 8e 29 81 88 ff ff G...... ..)....
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82264ec8>] kmalloc include/linux/slab.h:591 [inline]
[<ffffffff82264ec8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82264ec8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225b8c4>] blkcg_init_queue+0xb4/0x1c0 block/blk-cgroup.c:1185
[<ffffffff822253da>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:566
[<ffffffff8223b175>] blk_mq_init_queue_data block/blk-mq.c:3100 [inline]
[<ffffffff8223b175>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3124
[<ffffffff826a9303>] loop_add+0x1c3/0x360 drivers/block/loop.c:2344
[<ffffffff826a966e>] loop_control_get_free drivers/block/loop.c:2501 [inline]
[<ffffffff826a966e>] loop_control_ioctl+0x17e/0x2e0 drivers/block/loop.c:2516
[<ffffffff81597eec>] vfs_ioctl fs/ioctl.c:51 [inline]
[<ffffffff81597eec>] __do_sys_ioctl fs/ioctl.c:874 [inline]
[<ffffffff81597eec>] __se_sys_ioctl fs/ioctl.c:860 [inline]
[<ffffffff81597eec>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:860
[<ffffffff843fa745>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
[<ffffffff843fa745>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
[<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
---
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 syzk...@googlegroups.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
syzbot found the following issue on:
HEAD commit: a3fa7a101dcf Merge branches 'akpm' and 'akpm-hotfixes' (pa..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12b4a5b3300000
kernel config: https://syzkaller.appspot.com/x/.config?x=9ee3a4c022ccbbca
dashboard link: https://syzkaller.appspot.com/bug?extid=01321b15cc98e6bf96d6
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=148c170b300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+01321b...@syzkaller.appspotmail.com
2021/09/09 22:14:31 executed programs: 444
BUG: memory leak
unreferenced object 0xffff888129acdb80 (size 96):
comm "syz-executor.1", pid 12661, jiffies 4294962682 (age 15.220s)
hex dump (first 32 bytes):
20 47 c9 85 ff ff ff ff 20 d4 8e 29 81 88 ff ff G...... ..)....
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82264ec8>] kmalloc include/linux/slab.h:591 [inline]
[<ffffffff82264ec8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82264ec8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225b8c4>] blkcg_init_queue+0xb4/0x1c0 block/blk-cgroup.c:1185
[<ffffffff822253da>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:566
[<ffffffff8223b175>] blk_mq_init_queue_data block/blk-mq.c:3100 [inline]
[<ffffffff8223b175>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3124
[<ffffffff826a9303>] loop_add+0x1c3/0x360 drivers/block/loop.c:2344
[<ffffffff826a966e>] loop_control_get_free drivers/block/loop.c:2501 [inline]
[<ffffffff826a966e>] loop_control_ioctl+0x17e/0x2e0 drivers/block/loop.c:2516
[<ffffffff81597eec>] vfs_ioctl fs/ioctl.c:51 [inline]
[<ffffffff81597eec>] __do_sys_ioctl fs/ioctl.c:874 [inline]
[<ffffffff81597eec>] __se_sys_ioctl fs/ioctl.c:860 [inline]
[<ffffffff81597eec>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:860
[<ffffffff843fa745>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
[<ffffffff843fa745>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
[<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
---
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 syzk...@googlegroups.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
Xu, Yanfei
Sep 13, 2021, 11:13:46 PM9/13/21
to syzbot, ax...@kernel.dk, cgr...@vger.kernel.org, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, t...@kernel.org
On 9/14/21 7:28 AM, syzbot wrote:
> [Please note: This e-mail is from an EXTERNAL e-mail address]
How about this fix?
Once blk_throtl_init() queue init failed, blkcg_iolatency_exit() will
not be invoked for cleanup. That leads a memory leak. Swap the
blk_throtl_init() and blk_iolatency_init() calls can solve this.
Reported-by: syzbot+01321b...@syzkaller.appspotmail.com
Fixes: 19688d7f9592 (block/blk-cgroup: Swap the blk_throtl_init()
and blk_iolatency_init() calls)
Signed-off-by: Yanfei Xu <yanf...@windriver.com>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 3c88a79a319b..1ded4181a6de 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1182,10 +1182,6 @@ int blkcg_init_queue(struct request_queue *q)
if (preloaded)
radix_tree_preload_end();
- ret = blk_iolatency_init(q);
- if (ret)
- goto err_destroy_all;
-
ret = blk_ioprio_init(q);
if (ret)
goto err_destroy_all;
@@ -1194,6 +1190,12 @@ int blkcg_init_queue(struct request_queue *q)
if (ret)
goto err_destroy_all;
+ ret = blk_iolatency_init(q);
+ if (ret) {
+ blk_throtl_exit(q);
+ goto err_destroy_all;
+ }
+
return 0;
syzbot
Oct 23, 2021, 2:58:28 PM10/23/21
to ax...@kernel.dk, cgr...@vger.kernel.org, gre...@linuxfoundation.org, linux...@vger.kernel.org, linux-...@vger.kernel.org, nor...@bizcloud-server.changyang.com.tw, sas...@kernel.org, sta...@vger.kernel.org, syzkall...@googlegroups.com, t...@kernel.org, yanf...@windriver.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 9c0c4d24ac00 Merge tag 'block-5.15-2021-10-22' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1709f5c4b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d25eeb482b0f99b
dashboard link: https://syzkaller.appspot.com/bug?extid=01321b15cc98e6bf96d6
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=102280acb00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144b96f8b00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+01321b...@syzkaller.appspotmail.com
BUG: memory leak
unreferenced object 0xffff888104729800 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
BUG: memory leak
unreferenced object 0xffff888104729400 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
BUG: memory leak
unreferenced object 0xffff888104767e00 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
BUG: memory leak
unreferenced object 0xffff888104767500 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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
HEAD commit: 9c0c4d24ac00 Merge tag 'block-5.15-2021-10-22' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1709f5c4b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d25eeb482b0f99b
dashboard link: https://syzkaller.appspot.com/bug?extid=01321b15cc98e6bf96d6
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=102280acb00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144b96f8b00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+01321b...@syzkaller.appspotmail.com
unreferenced object 0xffff888104729800 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
hex dump (first 32 bytes):
00 49 c9 85 ff ff ff ff e0 b0 8b 03 81 88 ff ff .I..............
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
backtrace:
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
BUG: memory leak
unreferenced object 0xffff888104729400 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
hex dump (first 32 bytes):
00 49 c9 85 ff ff ff ff 90 a8 8b 03 81 88 ff ff .I..............
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
backtrace:
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
BUG: memory leak
unreferenced object 0xffff888104767e00 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
hex dump (first 32 bytes):
00 49 c9 85 ff ff ff ff 40 a0 8b 03 81 88 ff ff .I......@.......
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
backtrace:
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
BUG: memory leak
unreferenced object 0xffff888104767500 (size 96):
comm "kworker/u4:2", pid 156, jiffies 4294937755 (age 219.670s)
hex dump (first 32 bytes):
00 49 c9 85 ff ff ff ff 60 31 88 03 81 88 ff ff .I......`1......
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82268cf8>] kmalloc include/linux/slab.h:591 [inline]
backtrace:
[<ffffffff82268cf8>] kzalloc include/linux/slab.h:721 [inline]
[<ffffffff82268cf8>] blk_iolatency_init+0x28/0x190 block/blk-iolatency.c:724
[<ffffffff8225f71e>] blkcg_init_queue+0xee/0x1c0 block/blk-cgroup.c:1193
[<ffffffff82228fca>] blk_alloc_queue+0x22a/0x2e0 block/blk-core.c:584
[<ffffffff8223ee35>] blk_mq_init_queue_data block/blk-mq.c:3119 [inline]
[<ffffffff8223ee35>] __blk_mq_alloc_disk+0x25/0xd0 block/blk-mq.c:3143
[<ffffffff826a187f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4495
[<ffffffff86f2aaa9>] do_floppy_init drivers/block/floppy.c:4566 [inline]
[<ffffffff86f2aaa9>] floppy_async_init+0x10f/0x1329 drivers/block/floppy.c:4731
[<ffffffff81277354>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
[<ffffffff81265dbf>] process_one_work+0x2cf/0x620 kernel/workqueue.c:2297
[<ffffffff812666c9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2444
[<ffffffff8126fc48>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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
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