linux-kernel - Re: [PATCH block-6.7] blk-iocost: Fix an UBSAN shift-out-of-bounds warning

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Date: Thu, 08 Feb 2024 10:12:46 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Tejun Heo <tj@...nel.org>
Cc: Breno Leitão <leitao@...ian.org>, 
 linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH block-6.7] blk-iocost: Fix an UBSAN shift-out-of-bounds
 warning


On Mon, 20 Nov 2023 12:25:56 -1000, Tejun Heo wrote:
> When iocg_kick_delay() is called from a CPU different than the one which set
> the delay, @now may be in the past of @iocg->delay_at leading to the
> following warning:
> 
>   UBSAN: shift-out-of-bounds in block/blk-iocost.c:1359:23
>   shift exponent 18446744073709 is too large for 64-bit type 'u64' (aka 'unsigned long long')
>   ...
>   Call Trace:
>    <TASK>
>    dump_stack_lvl+0x79/0xc0
>    __ubsan_handle_shift_out_of_bounds+0x2ab/0x300
>    iocg_kick_delay+0x222/0x230
>    ioc_rqos_merge+0x1d7/0x2c0
>    __rq_qos_merge+0x2c/0x80
>    bio_attempt_back_merge+0x83/0x190
>    blk_attempt_plug_merge+0x101/0x150
>    blk_mq_submit_bio+0x2b1/0x720
>    submit_bio_noacct_nocheck+0x320/0x3e0
>    __swap_writepage+0x2ab/0x9d0
> 
> [...]

Applied, thanks!

[1/1] blk-iocost: Fix an UBSAN shift-out-of-bounds warning
      (no commit info)

Best regards,
-- 
Jens Axboe