linux-kernel - Re: [syzbot] [netfs?] INFO: task hung in netfs_unbuffered_write

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Message-ID: <86991.1743185694@warthog.procyon.org.uk>
Date: Fri, 28 Mar 2025 18:14:54 +0000
From: David Howells <dhowells@...hat.com>
To: syzbot <syzbot+62262fdc0e01d99573fc@...kaller.appspotmail.com>
Cc: dhowells@...hat.com, Oleg Nesterov <oleg@...hat.com>,
    brauner@...nel.org, jack@...e.cz, jlayton@...nel.org,
    linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
    netfs@...ts.linux.dev, syzkaller-bugs@...glegroups.com,
    viro@...iv.linux.org.uk, K Prateek Nayak <kprateek.nayak@....com>,
    "Sapkal,
 Swapnil" <swapnil.sapkal@....com>,
    Mateusz Guzik <mjguzik@...il.com>
Subject: Re: [syzbot] [netfs?] INFO: task hung in netfs_unbuffered_write_iter

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git netfs-fixes

  There's inconsistency with some wakeups between using rreq->waitq (a private
  waitqueue) and using clear_and_wake_up_bit() (a shared global waitqueue).
  The reason I didn't get round to posting the patches on this branch yet is
  that they *ought* to fix the problem, but Steve French still sees an
  occasional hang with cifs - but only in his automated testing thing, and we
  haven't tracked it down yet.

  David