netdevsim: avoid potential loop in nsim_dev_trap_report_work()

In the Linux kernel, the following vulnerability has been resolved:

netdevsim: avoid potential loop in nsim_dev_trap_report_work()

Many syzbot reports include the following trace [1]

If nsim_dev_trap_report_work() can not grab the mutex,

it should rearm itself at least one jiffie later.

[1]

Sending NMI from CPU 1 to CPUs 0:

NMI backtrace for cpu 0

CPU: 0 PID: 32383 Comm: kworker/0:2 Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023

Workqueue: events nsim_dev_trap_report_work

RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:89 [inline]

RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]

RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]

RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]

RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]

RIP: 0010:kasan_check_range+0x101/0x190 mm/kasan/generic.c:189

Code: 07 49 39 d1 75 0a 45 3a 11 b8 01 00 00 00 7c 0b 44 89 c2 e8 21 ed ff ff 83 f0 01 5b 5d 41 5c c3 48 85 d2 74 4f 48 01 ea eb 09 <48> 83 c0 01 48 39 d0 74 41 80 38 00 74 f2 eb b6 41 bc 08 00 00 00

RSP: 0018:ffffc90012dcf998 EFLAGS: 00000046

RAX: fffffbfff258af1e RBX: fffffbfff258af1f RCX: ffffffff8168eda3

RDX: fffffbfff258af1f RSI: 0000000000000004 RDI: ffffffff92c578f0

RBP: fffffbfff258af1e R08: 0000000000000000 R09: fffffbfff258af1e

R10: ffffffff92c578f3 R11: ffffffff8acbcbc0 R12: 0000000000000002

R13: ffff88806db38400 R14: 1ffff920025b9f42 R15: ffffffff92c578e8

FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000c00994e078 CR3: 000000002c250000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<NMI>

</NMI>

<TASK>

instrument_atomic_read include/linux/instrumented.h:68 [inline]

atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]

queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline]

debug_spin_unlock kernel/locking/spinlock_debug.c:101 [inline]

do_raw_spin_unlock+0x53/0x230 kernel/locking/spinlock_debug.c:141

__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline]

_raw_spin_unlock_irqrestore+0x22/0x70 kernel/locking/spinlock.c:194

debug_object_activate+0x349/0x540 lib/debugobjects.c:726

debug_work_activate kernel/workqueue.c:578 [inline]

insert_work+0x30/0x230 kernel/workqueue.c:1650

__queue_work+0x62e/0x11d0 kernel/workqueue.c:1802

__queue_delayed_work+0x1bf/0x270 kernel/workqueue.c:1953

queue_delayed_work_on+0x106/0x130 kernel/workqueue.c:1989

queue_delayed_work include/linux/workqueue.h:563 [inline]

schedule_delayed_work include/linux/workqueue.h:677 [inline]

nsim_dev_trap_report_work+0x9c0/0xc80 drivers/net/netdevsim/dev.c:842

process_one_work+0x886/0x15d0 kernel/workqueue.c:2633

process_scheduled_works kernel/workqueue.c:2706 [inline]

worker_thread+0x8b9/0x1290 kernel/workqueue.c:2787

kthread+0x2c6/0x3a0 kernel/kthread.c:388

ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147

ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

</TASK>