Re: [bug report] kernel panic at _find_next_zero_bit in io_uring testing

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Hi Guang Wu,

On Sat, Mar 25, 2023 at 03:25:34PM +0800, Guangwu Zhang wrote:
> Hello,
> 
> We found this kernel panic issue with upstream kernel 6.3.0-rc3 and
> it's 100% reproduced, let me know if you need more info/testing,
> thanks
> 
> kernel repo : https://github.com/torvalds/linux.git
> reproducer :  run the testing from  git://git.kernel.dk/liburing
> 
> [ 1089.762678] Running test recv-msgall-stream.t:
> [ 1089.922127] Running test recv-multishot.t:
> [ 1090.231772] Running test reg-hint.t:
> [ 1090.282612] general protection fault, probably for non-canonical
> address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI
> [ 1090.294014] KASAN: null-ptr-deref in range

The issue is fixed by:

https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=io_uring-6.3&id=02a4d923e4400a36d340ea12d8058f69ebf3a383

since liburing merges test case quicker than kernel fix, :-)

BTW, please report io_uring issue on io-uring@xxxxxxxxxxxxxxx next time.

thanks,
Ming




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