linux-kernel - xen: sleeping in atomic warnings

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Date:   Tue, 7 Feb 2023 16:37:38 +0300
From:   Dan Carpenter <error27@...il.com>
To:     xen-devel@...ts.xenproject.org
Cc:     Julia Lawall <julia.lawall@...ia.fr>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Hongchen Zhang <zhanghongchen@...ngson.cn>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Christian Brauner (Microsoft)" <brauner@...nel.org>,
        David Howells <dhowells@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        maobibo <maobibo@...ngson.cn>,
        Matthew Wilcox <willy@...radead.org>,
        Sedat Dilek <sedat.dilek@...il.com>
Subject: xen: sleeping in atomic warnings

These are static checker warnings from Smatch.  The line numbers are
based on next-20230207.  To reproduce these warnings then you need to
have the latest Smatch from git and you need to rebuild the cross
function probably four times.  I have reviewed most of these and they
all seem valid to me.  I remember I reported some a while back but never
heard back.  https://lore.kernel.org/all/20210802144037.GA29540@kili/

regards,
dan carpenter

arch/x86/xen/p2m.c:189 alloc_p2m_page() warn: sleeping in atomic context
xen_create_contiguous_region() <- disables preempt
xen_destroy_contiguous_region() <- disables preempt
-> xen_remap_exchanged_ptes()
   -> set_phys_to_machine()
      -> xen_alloc_p2m_entry()
         -> alloc_p2m_pmd()
xen_alloc_p2m_entry() <duplicate>
            -> alloc_p2m_page()

drivers/xen/events/events_base.c:1213 bind_evtchn_to_irq_chip() warn: sleeping in atomic context
pvcalls_front_connect() <- disables preempt
pvcalls_front_accept() <- disables preempt
-> create_active()
   -> bind_evtchn_to_irqhandler()
      -> bind_evtchn_to_irqhandler_chip()
         -> bind_evtchn_to_irq_chip()

drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c:303 netxen_pcie_sem_lock() warn: sleeping in atomic context
netxen_nic_hw_write_wx_2M() <- disables preempt
netxen_nic_hw_read_wx_2M() <- disables preempt
-> netxen_pcie_sem_lock()

drivers/xen/xen-pciback/pci_stub.c:110 pcistub_device_release() warn: sleeping in atomic context
pcistub_get_pci_dev_by_slot() <- disables preempt
pcistub_get_pci_dev() <- disables preempt
-> pcistub_device_get_pci_dev()
   -> pcistub_device_put()
      -> pcistub_device_release()

drivers/xen/xen-scsiback.c:1016 __scsiback_del_translation_entry() warn: sleeping in atomic context
scsiback_del_translation_entry() <- disables preempt
scsiback_release_translation_entry() <- disables preempt
-> __scsiback_del_translation_entry()

drivers/xen/xen-scsiback.c:276 scsiback_free_translation_entry() warn: sleeping in atomic context
scsiback_del_translation_entry() <- disables preempt
scsiback_release_translation_entry() <- disables preempt
-> __scsiback_del_translation_entry()
   -> scsiback_free_translation_entry()

drivers/xen/events/events_base.c:1427 unbind_from_irq() warn: sleeping in atomic context
pvcalls_front_connect() <- disables preempt
pvcalls_front_accept() <- disables preempt
-> create_active()
   -> bind_evtchn_to_irqhandler()
      -> bind_evtchn_to_irqhandler_chip()
         -> unbind_from_irq()

drivers/xen/xenbus/xenbus_client.c:473 xenbus_alloc_evtchn() warn: sleeping in atomic context
pvcalls_front_connect() <- disables preempt
pvcalls_front_accept() <- disables preempt
-> create_active()
   -> xenbus_alloc_evtchn()

drivers/xen/xenbus/xenbus_client.c:321 xenbus_dev_error() warn: sleeping in atomic context
pvcalls_front_connect() <- disables preempt
pvcalls_front_accept() <- disables preempt
-> create_active()
   -> xenbus_free_evtchn()
      -> xenbus_dev_error()

drivers/xen/xenbus/xenbus_client.c:342 xenbus_dev_fatal() warn: sleeping in atomic context
pvcalls_front_connect() <- disables preempt
pvcalls_front_accept() <- disables preempt
-> create_active()
   -> xenbus_alloc_evtchn()
      -> xenbus_dev_fatal()

drivers/xen/xenbus/xenbus_client.c:494 xenbus_free_evtchn() warn: sleeping in atomic context
pvcalls_front_connect() <- disables preempt
pvcalls_front_accept() <- disables preempt
-> create_active()
   -> xenbus_free_evtchn()

drivers/xen/xenbus/xenbus_client.c:290 xenbus_va_dev_error() warn: sleeping in atomic context
pvcalls_front_connect() <- disables preempt
pvcalls_front_accept() <- disables preempt
-> create_active()
   -> xenbus_free_evtchn()
      -> xenbus_dev_error()
create_active() <duplicate>
-> xenbus_alloc_evtchn()
   -> xenbus_dev_fatal()
         -> xenbus_va_dev_error()