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  1. Sep 08, 2018
  3. Sep 07, 2018
  5. Sep 06, 2018
    • Steven Rostedt (VMware)'s avatar
      printk/tracing: Do not trace printk_nmi_enter() · d1c392c9
      Steven Rostedt (VMware) authored 
      I hit the following splat in my tests:

------------[ cut here ]------------
IRQs not enabled as expected
WARNING: CPU: 3 PID: 0 at kernel/time/tick-sched.c:982 tick_nohz_idle_enter+0x44/0x8c
Modules linked in: ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables ipv6
CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.19.0-rc2-test+ #2
Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
EIP: tick_nohz_idle_enter+0x44/0x8c
Code: ec 05 00 00 00 75 26 83 b8 c0 05 00 00 00 75 1d 80 3d d0 36 3e c1 00
75 14 68 94 63 12 c1 c6 05 d0 36 3e c1 01 e8 04 ee f8 ff <0f> 0b 58 fa bb a0
e5 66 c1 e8 25 0f 04 00 64 03 1d 28 31 52 c1 8b
EAX: 0000001c EBX: f26e7f8c ECX: 00000006 EDX: 00000007
ESI: f26dd1c0 EDI: 00000000 EBP: f26e7f40 ESP: f26e7f38
DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010296
CR0: 80050033 CR2: 0813c6b0 CR3: 2f342000 CR4: 001406f0
Call Trace:
 do_idle+0x33/0x202
 cpu_startup_entry+0x61/0x63
 start_secondary+0x18e/0x1ed
 startup_32_smp+0x164/0x168
irq event stamp: 18773830
hardirqs last  enabled at (18773829): [<c040150c>] trace_hardirqs_on_thunk+0xc/0x10
hardirqs last disabled at (18773830): [<c040151c>] trace_hardirqs_off_thunk+0xc/0x10
softirqs last  enabled at (18773824): [<c0ddaa6f>] __do_softirq+0x25f/0x2bf
softirqs last disabled at (18773767): [<c0416bbe>] call_on_stack+0x45/0x4b
---[ end trace b7c64aa79e17954a ]---

After a bit of debugging, I found what was happening. This would trigger
when performing "perf" with a high NMI interrupt rate, while enabling and
disabling function tracer. Ftrace uses breakpoints to convert the nops at
the start of functions to calls to the function trampolines. The breakpoint
traps disable interrupts and this makes calls into lockdep via the
trace_hardirqs_off_thunk in the entry.S code. What happens is the following:

  do_idle {

    [interrupts enabled]

    <interrupt> [interrupts disabled]
	TRACE_IRQS_OFF [lockdep says irqs off]
	[...]
	TRACE_IRQS_IRET
	    test if pt_regs say return to interrupts enabled [yes]
	    TRACE_IRQS_ON [lockdep says irqs are on]

	    <nmi>
		nmi_enter() {
		    printk_nmi_enter() [traced by ftrace]
		    [ hit ftrace breakpoint ]
		    <breakpoint exception>
			TRACE_IRQS_OFF [lockdep says irqs off]
			[...]
			TRACE_IRQS_IRET [return from breakpoint]
			   test if pt_regs say interrupts enabled [no]
			   [iret back to interrupt]
	   [iret back to code]

    tick_nohz_idle_enter() {

	lockdep_assert_irqs_enabled() [lockdep say no!]

Although interrupts are indeed enabled, lockdep thinks it is not, and since
we now do asserts via lockdep, it gives a false warning. The issue here is
that printk_nmi_enter() is called before lockdep_off(), which disables
lockdep (for this reason) in NMIs. By simply not allowing ftrace to see
printk_nmi_enter() (via notrace annotation) we keep lockdep from getting
confused.

Cc: stable@vger.kernel.org
Fixes: 42a0bb3f

 ("printk/nmi: generic solution for safe printk in NMI")
Acked-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: default avatarPetr Mladek <pmladek@suse.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      d1c392c9
    • Ilya Dryomov's avatar
      rbd: support cloning across namespaces · e92c0eaf
      Ilya Dryomov authored 
      

If parent_get class method is not supported by the OSDs, fall back to
the legacy class method and assume that the parent is in the default
(i.e. "") namespace.  The "use the child's image namespace" workaround
is no longer needed because creating images within namespaces will
require parent_get aware OSDs.

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
Reviewed-by: default avatarJason Dillaman <dillaman@redhat.com>
      e92c0eaf
    • Ilya Dryomov's avatar
      rbd: factor out get_parent_info() · eb3b2d6b
      Ilya Dryomov authored 
      

In preparation for the new parent_get and parent_overlap_get class
methods, factor out the fetching and decoding of parent data.

As a side effect, we now decode all four fields in the "no parent"
case.

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
Reviewed-by: default avatarJason Dillaman <dillaman@redhat.com>
      eb3b2d6b
    • Ilya Dryomov's avatar
      ceph: avoid a use-after-free in ceph_destroy_options() · 8aaff151
      Ilya Dryomov authored 
      

syzbot reported a use-after-free in ceph_destroy_options(), called from
ceph_mount().  The problem was that create_fs_client() consumed the opt
pointer on some errors, but not on all of them.  Make sure it always
consumes both libceph and ceph options.

Reported-by: default avatar <syzbot+8ab6f1042021b4eed062@syzkaller.appspotmail.com>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
Reviewed-by: default avatar"Yan, Zheng" <zyan@redhat.com>
      8aaff151
    • Zhang Rui's avatar
      ACPI / LPSS: Force LPSS quirks on boot · f11fc4bc
      Zhang Rui authored 
      Commit 12864ff8 (ACPI / LPSS: Avoid PM quirks on suspend and resume
from hibernation) bypasses lpss quirks for S3 and S4, by setting a flag
for S3/S4 in acpi_lpss_suspend(), and check that flag in
acpi_lpss_resume().

But this overlooks the boot case where acpi_lpss_resume() may get called
without a corresponding acpi_lpss_suspend() having been called.

Thus force setting the flag during boot.

Fixes: 12864ff8 (ACPI / LPSS: Avoid PM quirks on suspend and resume from hibernation)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=200989


Reported-and-tested-by: default avatarWilliam Lieurance <william.lieurance@namikoda.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Cc: 4.15+ <stable@vger.kernel.org> # 4.15+: 12864ff8

 (ACPI / LPSS: Avoid ...)
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      f11fc4bc
    • Jean Delvare's avatar
      ACPI / bus: Only call dmi_check_system() on X86 · 5d128fbd
      Jean Delvare authored 
      

Calling dmi_check_system() early only works on X86. Other
architectures initialize the DMI subsystem later so it's not
ready yet when ACPI itself gets initialized.

In the best case it results in a useless call to a function which
will do nothing. But depending on the dmi implementation, it could
also result in warnings. Best is to not call the function when it
can't work and isn't needed.

Additionally, if anyone ever needs to add non-x86 quirks, it would
surprisingly not work, so document the limitation to avoid confusion.

Signed-off-by: default avatarJean Delvare <jdelvare@suse.de>
Fixes: cce4f632

 (ACPI: fix early DSDT dmi check warnings on ia64)
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      5d128fbd
    • Mikulas Patocka's avatar
      block: don't warn when doing fsync on read-only devices · 8b2ded1c
      Mikulas Patocka authored 
      It is possible to call fsync on a read-only handle (for example, fsck.ext2
does it when doing read-only check), and this call results in kernel
warning.

The patch b089cfd9

 ("block: don't warn for flush on read-only device")
attempted to disable the warning, but it is buggy and it doesn't
(op_is_flush tests flags, but bio_op strips off the flags).

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Fixes: 721c7fc7

 ("block: fail op_is_write() requests to read-only partitions")
Cc: stable@vger.kernel.org	# 4.18
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      8b2ded1c
    • Linus Torvalds's avatar
      Merge tag 'gpio-v4.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio · b36fdc68
      Linus Torvalds authored 
      Pull GPIO fixes from Linus Walleij:
 "Some GPIO fixes. The ACPI stuff is probably the most annoying for
  users that get fixed this time.

   - Atomic contexts, cansleep* calls and such fastpath/slopwpath
     things.

   - Defer ACPI event handler registration to late_initcall() so IRQs do
     not fire in our face before other drivers have a chance to register
     handlers.

   - Race condition if a consumer requests a GPIO after
     gpiochip_add_data_with_key() but before of_gpiochip_add()

   - Probe errorpath in the dwapb driver"

* tag 'gpio-v4.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: Fix crash due to registration race
  gpio: dwapb: Fix error handling in dwapb_gpio_probe()
  gpiolib-acpi: Register GpioInt ACPI event handlers from a late_initcall
  gpiolib: acpi: Switch to cansleep version of GPIO library call
  gpio: adp5588: Fix sleep-in-atomic-context bug
      b36fdc68
    • Linus Torvalds's avatar
      Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · f4697d9a
      Linus Torvalds authored 
      Pull SCSI fixes from James Bottomley:
 "A set of very minor fixes and a couple of reverts to fix a major
  problem (the attempt to change the busy count causes a hang when
  attempting to change the drive cache type)"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: aacraid: fix a signedness bug
  Revert "scsi: core: avoid host-wide host_busy counter for scsi_mq"
  Revert "scsi: core: fix scsi_host_queue_ready"
  scsi: libata: Add missing newline at end of file
  scsi: target: iscsi: cxgbit: use pr_debug() instead of pr_info()
  scsi: hpsa: limit transfer length to 1MB, not 512kB
  scsi: lpfc: Correct MDS diag and nvmet configuration
  scsi: lpfc: Default fdmi_on to on
  scsi: csiostor: fix incorrect port capabilities
  scsi: csiostor: add a check for NULL pointer after kmalloc()
  scsi: documentation: add scsi_mod.use_blk_mq to scsi-parameters
  scsi: core: Update SCSI_MQ_DEFAULT help ...
      f4697d9a
    • Linus Torvalds's avatar
      Merge tag 'nds32-for-linus-4.19-tag1' of... · d0c1db1d
      Linus Torvalds authored 
      Merge tag 'nds32-for-linus-4.19-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux

Pull nds32 updates from Greentime Hu:
 "Contained in here are the bug fixes, building error fixes and ftrace
  support for nds32"

* tag 'nds32-for-linus-4.19-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux:
  nds32: linker script: GCOV kernel may refers data in __exit
  nds32: fix build error because of wrong semicolon
  nds32: Fix a kernel panic issue because of wrong frame pointer access.
  nds32: Only print one page of stack when die to prevent printing too much information.
  nds32: Add macro definition for offset of lp register on stack
  nds32: Remove the deprecated ABI implementation
  nds32/stack: Get real return address by using ftrace_graph_ret_addr
  nds32/ftrace: Support dynamic function graph tracer
  nds32/ftrace: Support dynamic function tracer
  nds32/ftrace: Add RECORD_MCOUNT support
  nds32/ftrace: Support static function graph tracer
  nds32/ftrace: Support stat...
      d0c1db1d
  7. Sep 05, 2018