CVE-2023-53730: In the Linux kernel, the following vulnerability has been resolved:  blk-iocost: use spin_lock_irqsave in adjust_inuse_and_calc_cost  adjust_inuse_and_calc_cost() use spin_lock_irq() and IRQ will be enabled when unlock. DEADLOCK might happen if we have held other locks and disabled IRQ before invoking it.  Fix it by using spin_lock_irqsave() instead, which can keep IRQ state consistent with before when unlock.    ================================   WARNING: inconsistent lock state   5.10.0-02758-g8e5f91fd772f #26 Not tainted   --------------------------------   inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.   kworker/2:3/388 [HC0[0]:SC0[0]:HE0:SE1] takes:   ffff888118c00c28 (&bfqd->lock){?.-.}-{2:2}, at: spin_lock_irq   ffff888118c00c28 (&bfqd->lock){?.-.}-{2:2}, at: bfq_bio_merge+0x141/0x390   {IN-HARDIRQ-W} state was registered at:     __lock_acquire+0x3d7/0x1070     lock_acquire+0x197/0x4a0     __raw_spin_lock_irqsave     _raw_spin_lock_irqsave+0x3b/0x60     bfq_idle_slice_timer_body     bfq_idle_slice_timer+0x53/0x1d0     __run_hrtimer+0x477/0xa70     __hrtimer_run_queues+0x1c6/0x2d0     hrtimer_interrupt+0x302/0x9e0     local_apic_timer_interrupt     __sysvec_apic_timer_interrupt+0xfd/0x420     run_sysvec_on_irqstack_cond     sysvec_apic_timer_interrupt+0x46/0xa0     asm_sysvec_apic_timer_interrupt+0x12/0x20   irq event stamp: 837522   hardirqs last  enabled at (837521): [<ffffffff84b9419d>] __raw_spin_unlock_irqrestore   hardirqs last  enabled at (837521): [<ffffffff84b9419d>] _raw_spin_unlock_irqrestore+0x3d/0x40   hardirqs last disabled at (837522): [<ffffffff84b93fa3>] __raw_spin_lock_irq   hardirqs last disabled at (837522): [<ffffffff84b93fa3>] _raw_spin_lock_irq+0x43/0x50   softirqs last  enabled at (835852): [<ffffffff84e00558>] __do_softirq+0x558/0x8ec   softirqs last disabled at (835845): [<ffffffff84c010ff>] asm_call_irq_on_stack+0xf/0x20    other info that might help us debug this:    Possible unsafe locking scenario:           CPU0          ----     lock(&bfqd->lock);     <Interrupt>       lock(&bfqd->lock);     *** DEADLOCK ***    3 locks held by kworker/2:3/388:    #0: ffff888107af0f38 ((wq_completion)kthrotld){+.+.}-{0:0}, at: process_one_work+0x742/0x13f0    #1: ffff8881176bfdd8 ((work_completion)(&td->dispatch_work)){+.+.}-{0:0}, at: process_one_work+0x777/0x13f0    #2: ffff888118c00c28 (&bfqd->lock){?.-.}-{2:2}, at: spin_lock_irq    #2: ffff888118c00c28 (&bfqd->lock){?.-.}-{2:2}, at: bfq_bio_merge+0x141/0x390    stack backtrace:   CPU: 2 PID: 388 Comm: kworker/2:3 Not tainted 5.10.0-02758-g8e5f91fd772f #26   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014   Workqueue: kthrotld blk_throtl_dispatch_work_fn   Call Trace:    __dump_stack lib/dump_stack.c:77 [inline]    dump_stack+0x107/0x167    print_usage_bug    valid_state    mark_lock_irq.cold+0x32/0x3a    mark_lock+0x693/0xbc0    mark_held_locks+0x9e/0xe0    __trace_hardirqs_on_caller    lockdep_hardirqs_on_prepare.part.0+0x151/0x360    trace_hardirqs_on+0x5b/0x180    __raw_spin_unlock_irq    _raw_spin_unlock_irq+0x24/0x40    spin_unlock_irq    adjust_inuse_and_calc_cost+0x4fb/0x970    ioc_rqos_merge+0x277/0x740    __rq_qos_merge+0x62/0xb0    rq_qos_merge    bio_attempt_back_merge+0x12c/0x4a0    blk_mq_sched_try_merge+0x1b6/0x4d0    bfq_bio_merge+0x24a/0x390    __blk_mq_sched_bio_merge+0xa6/0x460    blk_mq_sched_bio_merge    blk_mq_submit_bio+0x2e7/0x1ee0    __submit_bio_noacct_mq+0x175/0x3b0    submit_bio_noacct+0x1fb/0x270    blk_throtl_dispatch_work_fn+0x1ef/0x2b0    process_one_work+0x83e/0x13f0    process_scheduled_works    worker_thread+0x7e3/0xd80    kthread+0x353/0x470    ret_from_fork+0x1f/0x30