"value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ks8851: Fix deadlock with the SPI chip variant\n\nWhen SMP is enabled and spinlocks are actually functional then there is\na deadlock with the 'statelock' spinlock between ks8851_start_xmit_spi\nand ks8851_irq:\n\n watchdog: BUG: soft lockup - CPU#0 stuck for 27s!\n call trace:\n queued_spin_lock_slowpath+0x100/0x284\n do_raw_spin_lock+0x34/0x44\n ks8851_start_xmit_spi+0x30/0xb8\n ks8851_start_xmit+0x14/0x20\n netdev_start_xmit+0x40/0x6c\n dev_hard_start_xmit+0x6c/0xbc\n sch_direct_xmit+0xa4/0x22c\n __qdisc_run+0x138/0x3fc\n qdisc_run+0x24/0x3c\n net_tx_action+0xf8/0x130\n handle_softirqs+0x1ac/0x1f0\n __do_softirq+0x14/0x20\n ____do_softirq+0x10/0x1c\n call_on_irq_stack+0x3c/0x58\n do_softirq_own_stack+0x1c/0x28\n __irq_exit_rcu+0x54/0x9c\n irq_exit_rcu+0x10/0x1c\n el1_interrupt+0x38/0x50\n el1h_64_irq_handler+0x18/0x24\n el1h_64_irq+0x64/0x68\n __netif_schedule+0x6c/0x80\n netif_tx_wake_queue+0x38/0x48\n ks8851_irq+0xb8/0x2c8\n irq_thread_fn+0x2c/0x74\n irq_thread+0x10c/0x1b0\n kthread+0xc8/0xd8\n ret_from_fork+0x10/0x20\n\nThis issue has not been identified earlier because tests were done on\na device with SMP disabled and so spinlocks were actually NOPs.\n\nNow use spin_(un)lock_bh for TX queue related locking to avoid execution\nof softirq work synchronously that would lead to a deadlock."
