Tested with the latest i386 lowlatency kernel 4.4.0-159.187~14.04.1,
this issue cannot be reproduced.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Changed in: linux (Ubuntu Xenial)
Status: Incomplete => Invalid
** Changed in: ubuntu-kernel-tests
Status: New => Invalid
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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:
Invalid
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Xenial:
Invalid
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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