Re: [PATCH v4 00/54] tree-in-dcache stuff

Krishna Kurapati PSSNV
2026-01-31T14:58:28Z

On Fri, Jan 30, 2026 at 6:46 AM Samuel Wu <wusamuel@google.com> wrote:
>
> On Thu, Jan 29, 2026 at 2:52 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
>

[...]

> I'm exploring a few other paths, but not having USB access makes
> traditional tools a bit difficult. One thing I'm rechecking and is
> worth mentioning is the lockdep below: it's been present for quite
> some time now, but I'm not sure if it would have some undesired
> interaction with your patch.
>
> [ BUG: Invalid wait context ]
> 6.18.0-rc5-mainline-maybe-dirty-4k
> -----------------------------
> irq/360-dwc3/352 is trying to lock:
> ffffff800792deb8 (&psy->extensions_sem){.+.+}-{3:3}, at:
> __power_supply_set_property+0x40/0x180
> other info that might help us debug this:
> context-{4:4}
> 1 lock held by irq/360-dwc3/352:
> #0: ffffff8017bb98f0 (&gi->spinlock){....}-{2:2}, at:
> configfs_composite_suspend+0x28/0x68
> Call trace:
> show_stack+0x18/0x28 (C)
> __dump_stack+0x28/0x3c
> dump_stack_lvl+0xac/0xf0
> dump_stack+0x18/0x3c
> __lock_acquire+0x794/0x2bec
> lock_acquire+0x148/0x2cc
> down_read+0x3c/0x194
> __power_supply_set_property+0x40/0x180
> power_supply_set_property+0x14/0x20
> dwc3_gadget_vbus_draw+0x8c/0xcc
> usb_gadget_vbus_draw+0x48/0x130
> composite_suspend+0xcc/0xe4
> configfs_composite_suspend+0x44/0x68
> dwc3_thread_interrupt+0x8f8/0xc88
> irq_thread_fn+0x48/0xa8
> irq_thread+0x150/0x31c
> kthread+0x150/0x280
> ret_from_fork+0x10/0x20
>

Hi Samuel,

Not sure if it helps, but Prashanth recently pushed a patch to
address this vbus_draw kernel panic:
https://lore.kernel.org/all/20260129111403.3081730-1-prashanth.k@oss.qualcomm.com/

Can you check if it fixes the above crash in vbus_draw.

Regards,
Krishna,