From: Vasileios Almpanis <vasileios.almpanis@virtuozzo.com>
Subject: Re: [Devel] [PATCH VZ10] drivers/vhost/blk: fix vhost_blk_req_done() softirq handling
Date: Tue, 18 Aug 2026 08:53:04 +0000 [thread overview]
Message-ID: <178704318450.265510.11000551195230080687.b4-review@b4> (raw)
In-Reply-To: <20260817000234.337030-1-andrey.zhadchenko@virtuozzo.com>
On Mon, 17 Aug 2026 03:02:34 +0300, Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com> wrote:
> vhost_blk_req_done() does bio_release_pages(), which may sleep on
> folio_lock() when we need to dirty pages. So we get this:
>
> [ 9120.053244] BUG: scheduling while atomic: swapper/1/0/0x00000102
> ...
> [ 9120.079613] Hardware name: Acronis OpenStack Compute/Virtuozzo, BIOS 1.16.1-1.vz9.2 04/01/2014
> [ 9120.079629] Call Trace:
> [ 9120.079632] <IRQ>
> [ 9120.079638] dump_stack_lvl+0x4e/0x70
> [ 9120.079646] __schedule_bug.cold+0x3e/0x4a
> [ 9120.079650] schedule_debug.isra.0+0x93/0xc0
> [ 9120.079655] __schedule+0x7a/0x630
> [ 9120.079659] ? enqueue_task_fair+0x150/0x710
> [ 9120.079664] schedule+0x27/0x80
> [ 9120.079666] io_schedule+0x46/0x70
> [ 9120.079669] folio_wait_bit_common+0x13a/0x340
> [ 9120.079686] ? __pfx_wake_page_function+0x10/0x10
> [ 9120.079690] __bio_release_pages+0x25b/0x280
> [ 9120.079698] vhost_blk_req_done+0x98/0xa0 [vhost_blk]
> [ 9120.079702] blk_update_request+0x17c/0x420
> [ 9120.079707] blk_mq_end_request+0x1c/0x30
> [ 9120.079711] dm_softirq_done+0x158/0x280 [dm_mod]
> [ 9120.079737] blk_complete_reqs+0x40/0x50
> [ 9120.079740] handle_softirqs+0xe5/0x2a0
> [ 9120.079744] __irq_exit_rcu+0xbd/0xe0
> [ 9120.079746] sysvec_call_function_single+0x71/0x90
> [ 9120.079750] </IRQ>
> [ 9120.079751] <TASK>
> [ 9120.079752] asm_sysvec_call_function_single+0x1a/0x20
>
> [...]
Reviewed-by: Vasileios Almpanis <vasileios.almpanis@virtuozzo.com>
--
Vasileios Almpanis <vasileios.almpanis@virtuozzo.com>
next prev parent reply other threads:[~2026-08-18 8:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-17 0:02 Andrey Zhadchenko
2026-08-18 8:53 ` Vasileios Almpanis [this message]
2026-08-25 11:03 ` [Devel] [PATCH RHEL10 COMMIT] " Konstantin Khorenko
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