netdev - INFO: task hung in new_device

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Date:   Tue, 11 Jan 2022 10:46:42 +0800
From:   cruise k <cruise4k@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     sunhao.th@...il.com
Subject: INFO: task hung in new_device_store

Hi,

Syzkaller found the following issue:

HEAD commit: 75acfdb Linux 5.16-rc8
git tree: upstream
console output: https://pastebin.com/raw/MDzqSYsC
kernel config: https://pastebin.com/raw/XsnKfdRt

And hope the report log can help you.

INFO: task syz-executor.14:6981 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc8+ #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.14 state:D stack:23984 pid: 6981 ppid:     1 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xcd9/0x2550 kernel/sched/core.c:6253
 schedule+0xd2/0x260 kernel/sched/core.c:6326
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xc48/0x1610 kernel/locking/mutex.c:740
 new_device_store+0xe8/0x670 drivers/net/netdevsim/bus.c:174
 bus_attr_store+0x72/0xa0 drivers/base/bus.c:122
 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write+0x432/0x660 fs/read_write.c:503
 vfs_write+0x678/0xae0 fs/read_write.c:590
 ksys_write+0x12d/0x250 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fee725d301f
RSP: 002b:00007fff81b63990 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fee725d301f
RDX: 0000000000000004 RSI: 00007fff81b639e0 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007fff81b63930
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fee7268fcc3
R13: 00007fff81b639e0 R14: 0000000000000000 R15: 00007fee7367b320
 </TASK>