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[Bug 1839146] [NEW] [Potential Regression ] 361c093d7f99c3f6cbb07d5c580ce778ab418c42 from ubuntu_btrfs_kernel_fixes failed on T-4.4 lowlatency i386

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Public bug reported:

Reproduce rate: 2 out of 2 attempt on node "pepe"

This issue was not found in older kernels (4.4.0-157.185~14.04.1 all the
way to 4.4.0-150.176~14.04.1), just this specific one.

Test results:
* T-4.4 i386 lowlatency - failed
* T-4.4 i386 - passed
* T-4.4 amd64 generic / lowlatency - passed
* X-4.4 amd64 generic / lowlatency - passed
* X-4.4 i386  generic / lowlatency - passed
 
All i386 tests were performed with the same node "pepe".

	Invoking test 361c093d7f99c3f6cbb07d5c580ce778ab418c42
	
	fix 361c093d7f99c3f6cbb07d5c580ce778ab418c42
	
	Btrfs: Wait for uuid-tree rebuild task on remount read-only
	
	If the user remounts the filesystem read-only while the uuid-tree
	scan and rebuild task is still running (this happens once after the
	filesystem was mounted with an old kernel, or when forced with the
	mount options), the remount should wait on the tasks completion
	before setting the filesystem read-only. Otherwise the background
	task continues to write to the filesystem which is apparently not
	what users expect.
	
	
	Found kernel issue:
	
	[ 412.251483] Invoking test 361c093d7f99c3f6cbb07d5c580ce778ab418c42
	[ 412.338673] BTRFS: device fsid a862c963-cf90-43f8-beb7-9ece2342bb39 devid 1 transid 4 /dev/loop0
	[ 412.359408] BTRFS info (device loop0): disk space caching is enabled
	[ 412.360386] BTRFS: creating UUID tree
	[ 1018.897865] ------------[ cut here ]------------
	[ 1018.897872] WARNING: CPU: 7 PID: 30876 at /build/linux-lts-xenial-7cG9cd/linux-lts-xenial-4.4.0/arch/x86/include/asm/fpu/internal.h:509 fpu__restore+0xa1/0xc0()
	[ 1018.897874] Modules linked in: btrfs xor raid6_pq ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt ipmi_ssif intel_powerclamp ipmi_devintf coretemp kvm_intel kvm ipmi_si gpio_ich lpc_ich dcdbas acpi_power_meter shpchp ipmi_msghandler 8250_fintek i7core_edac mac_hid irqbypass edac_core mpt3sas raid_class pata_acpi bnx2 scsi_transport_sas fjes [last unloaded: xor]
	[ 1018.897901] CPU: 7 PID: 30876 Comm: 361c093d7f99c3f Not tainted 4.4.0-158-lowlatency #186~14.04.1-Ubuntu
	[ 1018.897903] Hardware name: Dell Inc. PowerEdge R310/05XKKK, BIOS 1.8.2 08/17/2011
	[ 1018.897904] 00000000 00000000 df117e54 c1398cb3 00000000 c199ff20 df117e84 c1071e17
	[ 1018.897909] c19b218c 00000007 0000789c c199ff20 000001fd c1034c91 c1034c91 eef9e6c0
	[ 1018.897913] eef9e040 bf802800 df117e94 c1071ef2 00000009 00000000 df117ea8 c1034c91
	[ 1018.897917] Call Trace:
	[ 1018.897923] [] dump_stack+0x57/0x74
	[ 1018.897926] [] warn_slowpath_common+0x87/0xc0
	[ 1018.897928] [] ? fpu__restore+0xa1/0xc0
	[ 1018.897930] [] ? fpu__restore+0xa1/0xc0
	[ 1018.897932] [] warn_slowpath_null+0x22/0x30
	[ 1018.897934] [] fpu__restore+0xa1/0xc0
	[ 1018.897936] [] __fpu__restore_sig+0x219/0x450
	[ 1018.897939] [] fpu__restore_sig+0x2f/0x50
	[ 1018.897941] [] restore_sigcontext+0x116/0x130
	[ 1018.897943] [] sys_sigreturn+0x91/0xa0
	[ 1018.897946] [] do_syscall_32_irqs_on+0x62/0xc0
	[ 1018.897950] [] entry_INT80_32+0x31/0x31
	[ 1018.897952] ---[ end trace 7a28adecc34fe016 ]---
	[ 3909.923884] perf interrupt took too long (2518 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
	[ 4839.138471] BTRFS info (device loop0): disk space caching is enabled
	[ 4839.139927] BTRFS: checking UUID tree
	[ 4840.179553] BTRFS info (device loop0): disk space caching is enabled
	[ 4842.388456] Test 361c093d7f99c3f6cbb07d5c580ce778ab418c42 returned 0
	
	FAIL: 361c093d7f99c3f6cbb07d5c580ce778ab418c42 (ret=1)

syslog: https://pastebin.ubuntu.com/p/T7w3C5y62W/

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Xenial)
     Importance: Undecided
         Status: New


** Tags: i386 lowlatency sru-20190722 ubuntu-btrfs-kernel-fixes

** Summary changed:

- 361c093d7f99c3f6cbb07d5c580ce778ab418c42 from ubuntu_btrfs_kernel_fixes failed on T-4.4 lowlatency i386
+ [Potential Regression ]361c093d7f99c3f6cbb07d5c580ce778ab418c42 from ubuntu_btrfs_kernel_fixes failed on T-4.4 lowlatency i386

** Summary changed:

- [Potential Regression ]361c093d7f99c3f6cbb07d5c580ce778ab418c42 from ubuntu_btrfs_kernel_fixes failed on T-4.4 lowlatency i386
+ [Potential Regression ] 361c093d7f99c3f6cbb07d5c580ce778ab418c42 from ubuntu_btrfs_kernel_fixes failed on T-4.4 lowlatency i386

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

** Tags added: i386 lowlatency ubuntu-btrfs-kernel-fixes

** Tags removed: i386 lowlatency ubuntu-btrfs-kernel-fixes
** Tags added: sru-20190722

** Tags added: i386 lowlatency ubuntu-btrfs-kernel-fixes

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https://bugs.launchpad.net/bugs/1839146

Title:
  [Potential Regression ] 361c093d7f99c3f6cbb07d5c580ce778ab418c42 from
  ubuntu_btrfs_kernel_fixes failed on T-4.4 lowlatency i386

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  New
Status in linux source package in Xenial:
  New

Bug description:
  Reproduce rate: 2 out of 2 attempt on node "pepe"

  This issue was not found in older kernels (4.4.0-157.185~14.04.1 all
  the way to 4.4.0-150.176~14.04.1), just this specific one.

  Test results:
  * T-4.4 i386 lowlatency - failed
  * T-4.4 i386 - passed
  * T-4.4 amd64 generic / lowlatency - passed
  * X-4.4 amd64 generic / lowlatency - passed
  * X-4.4 i386  generic / lowlatency - passed
   
  All i386 tests were performed with the same node "pepe".

  	Invoking test 361c093d7f99c3f6cbb07d5c580ce778ab418c42
  	
  	fix 361c093d7f99c3f6cbb07d5c580ce778ab418c42
  	
  	Btrfs: Wait for uuid-tree rebuild task on remount read-only
  	
  	If the user remounts the filesystem read-only while the uuid-tree
  	scan and rebuild task is still running (this happens once after the
  	filesystem was mounted with an old kernel, or when forced with the
  	mount options), the remount should wait on the tasks completion
  	before setting the filesystem read-only. Otherwise the background
  	task continues to write to the filesystem which is apparently not
  	what users expect.
  	
  	
  	Found kernel issue:
  	
  	[ 412.251483] Invoking test 361c093d7f99c3f6cbb07d5c580ce778ab418c42
  	[ 412.338673] BTRFS: device fsid a862c963-cf90-43f8-beb7-9ece2342bb39 devid 1 transid 4 /dev/loop0
  	[ 412.359408] BTRFS info (device loop0): disk space caching is enabled
  	[ 412.360386] BTRFS: creating UUID tree
  	[ 1018.897865] ------------[ cut here ]------------
  	[ 1018.897872] WARNING: CPU: 7 PID: 30876 at /build/linux-lts-xenial-7cG9cd/linux-lts-xenial-4.4.0/arch/x86/include/asm/fpu/internal.h:509 fpu__restore+0xa1/0xc0()
  	[ 1018.897874] Modules linked in: btrfs xor raid6_pq ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt ipmi_ssif intel_powerclamp ipmi_devintf coretemp kvm_intel kvm ipmi_si gpio_ich lpc_ich dcdbas acpi_power_meter shpchp ipmi_msghandler 8250_fintek i7core_edac mac_hid irqbypass edac_core mpt3sas raid_class pata_acpi bnx2 scsi_transport_sas fjes [last unloaded: xor]
  	[ 1018.897901] CPU: 7 PID: 30876 Comm: 361c093d7f99c3f Not tainted 4.4.0-158-lowlatency #186~14.04.1-Ubuntu
  	[ 1018.897903] Hardware name: Dell Inc. PowerEdge R310/05XKKK, BIOS 1.8.2 08/17/2011
  	[ 1018.897904] 00000000 00000000 df117e54 c1398cb3 00000000 c199ff20 df117e84 c1071e17
  	[ 1018.897909] c19b218c 00000007 0000789c c199ff20 000001fd c1034c91 c1034c91 eef9e6c0
  	[ 1018.897913] eef9e040 bf802800 df117e94 c1071ef2 00000009 00000000 df117ea8 c1034c91
  	[ 1018.897917] Call Trace:
  	[ 1018.897923] [] dump_stack+0x57/0x74
  	[ 1018.897926] [] warn_slowpath_common+0x87/0xc0
  	[ 1018.897928] [] ? fpu__restore+0xa1/0xc0
  	[ 1018.897930] [] ? fpu__restore+0xa1/0xc0
  	[ 1018.897932] [] warn_slowpath_null+0x22/0x30
  	[ 1018.897934] [] fpu__restore+0xa1/0xc0
  	[ 1018.897936] [] __fpu__restore_sig+0x219/0x450
  	[ 1018.897939] [] fpu__restore_sig+0x2f/0x50
  	[ 1018.897941] [] restore_sigcontext+0x116/0x130
  	[ 1018.897943] [] sys_sigreturn+0x91/0xa0
  	[ 1018.897946] [] do_syscall_32_irqs_on+0x62/0xc0
  	[ 1018.897950] [] entry_INT80_32+0x31/0x31
  	[ 1018.897952] ---[ end trace 7a28adecc34fe016 ]---
  	[ 3909.923884] perf interrupt took too long (2518 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
  	[ 4839.138471] BTRFS info (device loop0): disk space caching is enabled
  	[ 4839.139927] BTRFS: checking UUID tree
  	[ 4840.179553] BTRFS info (device loop0): disk space caching is enabled
  	[ 4842.388456] Test 361c093d7f99c3f6cbb07d5c580ce778ab418c42 returned 0
  	
  	FAIL: 361c093d7f99c3f6cbb07d5c580ce778ab418c42 (ret=1)

  syslog: https://pastebin.ubuntu.com/p/T7w3C5y62W/

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