ath10k hang on rmmod after fw crash in 4.13.3+ hacks

Ben Greear greearb at
Tue Oct 10 12:43:11 PDT 2017

On 10/10/2017 12:07 PM, Ben Greear wrote:
> I loaded a crashing firmware (it crashes early since it ran OOM), and
> then tried to rmmod it.  rmmod hangs, with this stack:

Looks like this is a hang related to napi, and I had a patch from an
older kernel that is probably not needed anymore...maybe it causes the
issue.  I'll test with that removed...


> [root at ben-ota-2 ~]# cat /proc/32491/stack
> [<ffffffff8113c51d>] flush_work+0x1fd/0x2d0
> [<ffffffff8113f031>] __cancel_work_timer+0x111/0x190
> [<ffffffff8113f0bb>] cancel_work_sync+0xb/0x10
> [<ffffffffa0b0a054>] ath10k_core_unregister+0x14/0xa0 [ath10k_core]
> [<ffffffffa07c7dcd>] ath10k_pci_remove+0x2d/0x70 [ath10k_pci]
> [<ffffffff81528834>] pci_device_remove+0x34/0xb0
> [<ffffffff81656b18>] device_release_driver_internal+0x158/0x210
> [<ffffffff81656c1b>] driver_detach+0x3b/0x80
> [<ffffffff81655ad3>] bus_remove_driver+0x53/0xd0
> [<ffffffff81657737>] driver_unregister+0x27/0x40
> [<ffffffff81526ff4>] pci_unregister_driver+0x24/0x90
> [<ffffffffa07ca922>] ath10k_pci_exit+0x10/0x6ee [ath10k_pci]
> [<ffffffff811c64c1>] SyS_delete_module+0x1e1/0x2a0
> [<ffffffff81003d34>] do_syscall_64+0x64/0x140
> [<ffffffff819b77c9>] entry_SYSCALL64_slow_path+0x25/0x25
> [<ffffffffffffffff>] 0xffffffffffffffff

Ben Greear <greearb at>
Candela Technologies Inc

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