linux-kernel - Re: [RFC] fuse: do not generate interrupt requests for fatal signals

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Date: Sat, 15 Jun 2024 20:20:57 +0800
From: Haifeng Xu <haifeng.xu@...pee.com>
To: Bernd Schubert <bernd.schubert@...tmail.fm>,
 Miklos Szeredi <miklos@...redi.hu>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] fuse: do not generate interrupt requests for fatal signals



On 2024/6/14 18:31, Bernd Schubert wrote:
> 
> 
> On 6/13/24 09:55, Miklos Szeredi wrote:
>> On Thu, 13 Jun 2024 at 06:02, Haifeng Xu <haifeng.xu@...pee.com> wrote:
>>>
>>> When the child reaper of a pid namespace exits, it invokes
>>> zap_pid_ns_processes() to send SIGKILL to all processes in the
>>> namespace and wait them exit. But one of the child processes get
>>> stuck and its call trace like this:
>>>
>>> [<0>] request_wait_answer+0x132/0x210 [fuse]
>>> [<0>] fuse_simple_request+0x1a8/0x2e0 [fuse]
>>> [<0>] fuse_flush+0x193/0x1d0 [fuse]
>>> [<0>] filp_close+0x34/0x70
>>> [<0>] close_fd+0x38/0x50
>>> [<0>] __x64_sys_close+0x12/0x40
>>> [<0>] do_syscall_64+0x59/0xc0
>>> [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xae
>>
>> Which process is this?
>>
>> In my experience such lockups are caused by badly written fuse servers.
> 
> 
> Btw, if libfuse should be used, it now supports disabling interrupts
> 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_libfuse_libfuse_commit_cef8c8b249023fb8129ae791e0998cbca771f96a&d=DwICaQ&c=R1GFtfTqKXCFH-lgEPXWwic6stQkW4U7uVq33mt-crw&r=3uoFsejk1jN2oga47MZfph01lLGODc93n4Zqe7b0NRk&m=tF8m9nGSWX4QZ_jfhLnEAE5bia1XekX0a_EojRtTFs2ZqfhKCrhY4cwO6K9UrW8x&s=X5dxXdmPhGVwknoinaLMbPYdHeOnrfVdOXs8HPCLT0A&e= 
> 
> 

OK, Thank you for your reminding.
> 
> Cheers,
> Bernd