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

On Sat, Jan 31, 2026 at 6:58 AM Krishna Kurapati PSSNV
[off-list ref] wrote:

On Fri, Jan 30, 2026 at 6:46 AM Samuel Wu [off-list ref] wrote:

quoted

On Thu, Jan 29, 2026 at 2:52 PM Al Viro [off-list ref] wrote:

[...]

quoted

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/ (local)

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

Regards,
Krishna,

Tested above patch, and it didn't fix the device enumerating on
lsusb/ADB issue. Seems like usb dwc3 lockdep was a red herring.

I'll respond on that thread with what I'm observing.