On Wed, 2023-05-10 at 15:09 +0300, Kalle Valo wrote: > Hans de Goede <hdegoede@xxxxxxxxxx> writes: > > > On 5/10/23 10:25, Felix wrote: > > > Changes made by the mentioned commit lead to Oops when waking up after > > > suspend to RAM. > > > > > > When waking up a Dell XPS 13 9350 with BCM4350 wifi card after suspend > > > to RAM, the kernel hangs with a NULL pointer dereference and Oops. The > > > issues was introduced by commit > > > da6d9c8ecd00e20218461007948f2b0a8e7fa242 and only happens when the > > > brcmfmac module is loaded. This issue is the reason we could not > > > upgrade to newer kernels than the 6.1 series on the affected machine. > > > > > > > > > Details: > > > > > > On a Dell XPS 13 9350 laptop with Broadcom BCM4350 wifi card (according > > > to lspci), every kernel starting with 6.2 hangs when waking up after > > > suspend to RAM. The issue persisted as of May 2nd (last tested commit > > > was 348551ddaf311c76b01cdcbaf61b6fef06a49144). Passing the debug and > > > no_console_suspend parameters to the kernel show that a NULL pointer > > > dereference and an Oops happen at wakeup. Please find the kernel > > > messages readable on the screen at this point attached > > > (kernel_log_after_suspend.txt). > > > > > > A bisection was successful and produced the first bad commit > > > [da6d9c8ecd00e20218461007948f2b0a8e7fa242] wifi: brcmfmac: add firmware > > > vendor info in driver info > > > I've attached the bisection log as well (bisect.txt). > > > > > > Suspend to RAM works on this machine on newer kernels once the brcmfmac > > > module is unloaded. > > > > > > Distribution: Arch Linux > > > Architecture: x86_64 > > > Device: Dell XPS 13 9350 with BCM4350 wifi card > > > Kernel config used at compilation (created using the Arch Linux default > > > config and make olddefconfig): > > > https://gist.githubusercontent.com/maclomhair/e33fa7eece8f8c77e5a88c4eede2f523/raw/429dfb022498c026225865dbb3ab2f75d5030a54/config > > > Dmesg output after boot: > > > https://gist.githubusercontent.com/maclomhair/47c75fa759d93800e7fb5e937fabef3e/raw/10750996a1ea9dcb3fa14d9b94e11fedd3abf280/dmesg > > > > > > #regzbot introduced da6d9c8ecd00e20218461007948f2b0a8e7fa242 > > > > Thank you for reporting this and thank you for bisecting it too! > > > > As a result of your excellent bug report I've been able to write > > a fix for this. I'm confident enough in the fix that I've submitted > > it upstream right away. > > > > But it would still be good if you can test the fix and let us know > > if it fixes this issue for you. You should have received a copy > > of the patch when I submitted it upstream. I have now tested the patch you sent and it indeed fixes the issue for me! Thank you for your quick response! > > For the archives here's the patch: > > https://patchwork.kernel.org/project/linux-wireless/patch/20230510100050.27099-1-hdegoede@xxxxxxxxxx/ >
