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From:   Bruno Goncalves <bgoncalv@redhat.com>
Date:   Tue, 14 Sep 2021 15:42:43 +0200
Message-ID: <CA+QYu4rSCmGt8Do8_qbi1fyHA8CyuL-vhzTfTKfHVOpyVjYH0A@mail.gmail.com>
Subject: kernel-rt: BUG: sleeping function called from invalid context at mm/vmalloc.c:2664
To:     linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     CKI Project <cki-project@redhat.com>,
        Xiong Zhou <xzhou@redhat.com>,
        Memory Management <mm-qe@redhat.com>,
        Juri Lelli <jlelli@redhat.com>
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Hello,

When testing commit "8a084036f2bc - v5.14.2-rt21" from
https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
during "cifsv3.11" test part of xfstests [1] we hit the following
issue:

[13099.772703] BUG: sleeping function called from invalid context at
mm/vmalloc.c:2664
[13099.772709] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid:
613586, name: cifsd
[13099.772712] 1 lock held by cifsd/613586:
[13099.772715]  #0: ffffffffc0eb76d8 (&GlobalMid_Lock){+.+.}-{2:2},
at: cifs_mid_q_entry_release+0x15/0x110 [cifs]
[13099.772816] CPU: 7 PID: 613586 Comm: cifsd Not tainted 5.14.2-rt21 #1
[13099.772820] Hardware name: AMD Pike/Pike, BIOS RPK1506A 09/03/2014
[13099.772822] Call Trace:
[13099.772828]  dump_stack_lvl+0x57/0x72
[13099.772838]  ___might_sleep.cold+0xb6/0xc6
[13099.772845]  vfree+0x3f/0x50
[13099.772852]  put_task_stack+0xcf/0x140
[13099.772858]  __put_task_struct+0x46/0x180
[13099.772862]  cifs_mid_q_entry_release+0xce/0x110 [cifs]
[13099.772944]  cifs_demultiplex_thread+0x797/0xcb0 [cifs]
[13099.773031]  ? mutex_is_locked+0x1/0x20
[13099.773042]  ? _raw_spin_unlock_irqrestore+0x37/0x40
[13099.773050]  ? cifs_handle_standard+0x190/0x190 [cifs]
[13099.773121]  kthread+0x15c/0x180
[13099.773126]  ? set_kthread_struct+0x40/0x40
[13099.773134]  ret_from_fork+0x22/0x30


So far we've hit this problem just once, more logs can be found at [2].


[1] https://gitlab.com/cki-project/kernel-tests/-/tree/main/filesystems/xfs/xfstests
[2] https://arr-cki-prod-datawarehouse-public.s3.amazonaws.com/index.html?prefix=datawarehouse-public/2021/09/13/369543188/build_x86_64_redhat%3A1584042034/tests/xfstests_cifsv3_11/

Thank you,
Bruno