On Thu, 5 Nov 2020 at 07:06, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote: > > Hi all, > > Changes since 20201104: When building an arm64 allmodconfig and booting up that in qemu I see [10011.092394][ T28] task:kworker/0:2 state:D stack:26896 pid: 1840 ppid: 2 flags:0x00000428 [10022.368093][ T28] Workqueue: events toggle_allocation_gate [10024.827549][ T28] Call trace: [10027.152494][ T28] __switch_to+0x1cc/0x1e0 [10031.378073][ T28] __schedule+0x730/0x800 [10032.164468][ T28] schedule+0xd8/0x160 [10033.886807][ T28] toggle_allocation_gate+0x16c/0x220 [10038.477987][ T28] process_one_work+0x5c0/0x980 [10039.900075][ T28] worker_thread+0x428/0x720 [10042.782911][ T28] kthread+0x23c/0x260 [10043.171725][ T28] ret_from_fork+0x10/0x18 [10046.227741][ T28] INFO: lockdep is turned off. [10047.732220][ T28] Kernel panic - not syncing: hung_task: blocked tasks [10047.741785][ T28] CPU: 0 PID: 28 Comm: khungtaskd Tainted: G W 5.10.0-rc2-next-20201105-00006-g7af110e4d8ed #1 [10047.755348][ T28] Hardware name: linux,dummy-virt (DT) [10047.763476][ T28] Call trace: [10047.769802][ T28] dump_backtrace+0x0/0x420 [10047.777104][ T28] show_stack+0x38/0xa0 [10047.784177][ T28] dump_stack+0x1d4/0x278 [10047.791362][ T28] panic+0x304/0x5d8 [10047.798202][ T28] check_hung_uninterruptible_tasks+0x5e4/0x640 [10047.807056][ T28] watchdog+0x138/0x160 [10047.814140][ T28] kthread+0x23c/0x260 [10047.821130][ T28] ret_from_fork+0x10/0x18 [10047.829181][ T28] Kernel Offset: disabled [10047.836274][ T28] CPU features: 0x0240002,20002004 [10047.844070][ T28] Memory Limit: none [10047.853599][ T28] ---[ end Kernel panic - not syncing: hung_task: blocked tasks ]--- if I build with KFENCE=n it boots up eventually, here's my .config file [2]. Any idea what may happen? it happens on next-20201109 also, but it takes longer until we get the "Call trace:". Cheers, Anders [1] http://ix.io/2Ddv [2] https://people.linaro.org/~anders.roxell/allmodconfig-next-20201105.config
