Messages in this thread | | | From | John Stultz <> | Date | Thu, 23 Apr 2020 09:40:47 -0700 | Subject | BUG: Invalid wait context with 5.7-rc2? |
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Hey Folks,
Recently, I've seen some occasional hangs earlyish in boot on my HiKey960 board with 5.7-rc1/rc2. The kernel isn't totally wedged as I will see some kernel messages (firmware loading failures, etc) much later if I leave it. But oddly sysrq doesn't respond.
Figuring it must be some sort of deadlock, I added LOCKDEP and a bunch of other debug options and started booting in a loop. So far I've not been able to trigger the original problem, but I do see the following every boot:
Curious if this was already on anyone's radar?
thanks -john
[ 2.111212] ============================= [ 2.115256] [ BUG: Invalid wait context ] [ 2.119303] 5.7.0-rc2-00070-g4160a2ecd371 #247 Not tainted [ 2.124842] ----------------------------- [ 2.128886] swapper/5/0 is trying to lock: [ 2.133019] ffffff8219c33258 (&pool->lock){..-.}-{3:3}, at: __queue_work+0x108/0x7c8 [ 2.140856] other info that might help us debug this: [ 2.145954] context-{2:2} [ 2.148593] 1 lock held by swapper/5/0: [ 2.152461] #0: ffffffc011d749c8 (rcu_read_lock){....}-{1:3}, at: __queue_work+0x48/0x7c8 [ 2.160814] stack backtrace: [ 2.163719] CPU: 5 PID: 0 Comm: swapper/5 Not tainted 5.7.0-rc2-00070-g4160a2ecd371 #247 [ 2.171891] Hardware name: HiKey960 (DT) [ 2.175847] Call trace: [ 2.178315] dump_backtrace+0x0/0x1a8 [ 2.182009] show_stack+0x18/0x28 [ 2.185354] dump_stack+0xdc/0x148 [ 2.188786] __lock_acquire+0x5c0/0x1568 [ 2.192744] lock_acquire+0x100/0x378 [ 2.196441] _raw_spin_lock+0x64/0x108 [ 2.200225] __queue_work+0x108/0x7c8 [ 2.203918] queue_work_on+0xd0/0xf0 [ 2.207526] timers_update_nohz+0x28/0x38 [ 2.211572] tick_setup_sched_timer+0x110/0x178 [ 2.216144] hrtimer_run_queues+0x114/0x170 [ 2.220365] run_local_timers+0x30/0x70 [ 2.224234] update_process_times+0x28/0x58 [ 2.228457] tick_periodic+0x48/0x148 [ 2.232151] tick_handle_periodic+0x28/0xc8 [ 2.236375] arch_timer_handler_phys+0x2c/0x50 [ 2.238026] VFS: Disk quotas dquot_6.6.0 [ 2.240862] handle_percpu_devid_irq+0xe0/0x460 [ 2.240866] generic_handle_irq+0x30/0x48 [ 2.240868] __handle_domain_irq+0x88/0xf8 [ 2.240873] gic_handle_irq+0x5c/0xb0 [ 2.240877] el1_irq+0xf4/0x1c0 [ 2.240882] arch_cpu_idle+0x2c/0x230 [ 2.244918] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes) [ 2.249406] default_idle_call+0x20/0x44 [ 2.249409] do_idle+0x1ec/0x2d0 [ 2.249411] cpu_startup_entry+0x24/0x48 [ 2.249416] secondary_start_kernel+0x160/0x210
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