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Bug#776383: marked as done (system hangs from btrfs)

Your message dated Sat, 08 May 2021 08:33:40 -0700 (PDT)
with message-id <6096af54.1c69fb81.b02ef.6758@mx.google.com>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #776383,
regarding system hangs from btrfs
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
776383: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776383
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: src:linux
Version: 3.16.7-ckt2-1
Severity: normal

under conditions i can not narrow down further[1], all processes that try to
access a given mounted btrfs file system freeze. this affects even processes
like `ps u` called by a user not at home in the affected file system inside the
first read to an opened /proc/8119/cmdline file.

for recovery, i did succede in logging in on the console as another user, but
that didn't help much in enumerating my currently open processes. (going
through the workspaces on my user's running X session did work, however, as
X and i3wm seem not to access the file system a lot).

the output of dmesg is attached, the relevant section seems to be:

[981640.274876] INFO: task btrfs-transacti:5427 blocked for more than 120 seconds.
[981640.274886]       Tainted: G           O  3.16.0-4-amd64 #1
[981640.274889] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[981640.274892] btrfs-transacti D ffff8800d5a699c8     0  5427      2 0x00000000
[981640.274902]  ffff8800d5a69570 0000000000000046 0000000000013280 ffff8800c92f3fd8
[981640.274908]  0000000000013280 ffff8800d5a69570 ffff88012aa3bb40 ffff88012aa3bbb0
[981640.274913]  ffff88012aa3b2d0 ffff88012aa3bb40 ffff8800d5a69570 ffff8800d5a69570
[981640.274919] Call Trace:
[981640.274994]  [<ffffffffa026c335>] ? wait_for_commit.isra.15+0x35/0x60 [btrfs]
[981640.275003]  [<ffffffff810a5940>] ? prepare_to_wait_event+0xf0/0xf0
[981640.275044]  [<ffffffffa026d095>] ? btrfs_commit_transaction+0x1a5/0x9c0 [btrfs]
[981640.275077]  [<ffffffffa026d940>] ? start_transaction+0x90/0x560 [btrfs]
[981640.275112]  [<ffffffffa0268efd>] ? transaction_kthread+0x1ad/0x240 [btrfs]
[981640.275144]  [<ffffffffa0268d50>] ? btrfs_cleanup_transaction+0x530/0x530 [btrfs]
[981640.275152]  [<ffffffff81085f1d>] ? kthread+0xbd/0xe0
[981640.275159]  [<ffffffff81085e60>] ? kthread_create_on_node+0x180/0x180
[981640.275166]  [<ffffffff8150d27c>] ? ret_from_fork+0x7c/0xb0
[981640.275172]  [<ffffffff81085e60>] ? kthread_create_on_node+0x180/0x180

at no point since startup of the system have btrfs devices been added,
removed, or `btrfs send` been invoked.

please let me know if i should provide any other log files.

(sorry for not reporting this from the original kernel, i took notes in
the crashed situation and rebooted into the kernel that has been
installed at some point in time, but preserved the dmesg output; the
reported linux version and the linux version given below should match
the setup from back then, though.)

best regards
chrysn


[1] for sake of completeness, i'll try anyway: logged in as chrysn on an x
session, i was running epiphany, had an upload dialog open, entered a file name
(which in hindsight was probably nonexistent), pressed return and the dialog
froze, along with everything else.



-- Package-specific info:
** Version:
Linux version 3.16.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.3 (Debian 4.8.3-16) ) #1 SMP Debian 3.16.7-ckt2-1 (2014-12-08)

** Command line:
BOOT_IMAGE=/vmlinuz-3.16.0-4-amd64 root=/dev/mapper/root ro rootflags=subvol=debian-sid-root quiet thinkpad_acpi.fan_control=1

** Tainted: O (4096)
 * Out-of-tree module has been loaded.

** Model information
sys_vendor: LENOVO
product_name: 20CD0035GE
product_version: ThinkPad S1 Yoga
chassis_vendor: LENOVO
chassis_version: Not Available
bios_vendor: LENOVO
bios_version: GQET34WW (1.14 )
board_vendor: LENOVO
board_name: 20CD0035GE
board_version: SDK0E50512 Std

** Loaded modules:
vboxpci(O)
vboxnetadp(O)
vboxnetflt(O)
vboxdrv(O)
pci_stub
ctr
ccm
tun
bnep
toshiba_acpi
sparse_keymap
hp_accel
lis3lv02d
input_polldev
binfmt_misc
nls_utf8
nls_cp437
vfat
fat
ext4
mbcache
jbd2
cuse
fuse
parport_pc
ppdev
lp
parport
hid_sensor_incl_3d
hid_sensor_magn_3d
hid_sensor_rotation
hid_sensor_gyro_3d
hid_sensor_als
hid_sensor_accel_3d
hid_sensor_trigger
industrialio_triggered_buffer
kfifo_buf
hid_sensor_iio_common
industrialio
uvcvideo
videobuf2_vmalloc
videobuf2_memops
videobuf2_core
v4l2_common
hid_sensor_hub
hid_multitouch
videodev
media
wacom
snd_hda_codec_conexant
joydev
snd_hda_codec_generic
snd_hda_codec_hdmi
arc4
iTCO_wdt
iTCO_vendor_support
iwlmvm
ecb
x86_pkg_temp_thermal
mac80211
btusb
bluetooth
6lowpan_iphc
intel_powerclamp
crc16
intel_rapl
snd_hda_intel
coretemp
psmouse
kvm_intel
evdev
i915
iwlwifi
drm_kms_helper
kvm
snd_hda_controller
snd_hda_codec
thinkpad_acpi
serio_raw
pcspkr
nvram
cfg80211
rfkill
drm
i2c_algo_bit
rtsx_pci_ms
efi_pstore
memstick
tpm_tis
tpm
efivars
i2c_i801
i2c_core
battery
wmi
snd_hwdep
snd_pcm
snd_timer
snd
soundcore
ac
mei_me
mei
lpc_ich
video
processor
intel_smartconnect
shpchp
button
btrfs
xor
raid6_pq
algif_skcipher
af_alg
dm_crypt
dm_mod
md_mod
sg
usbhid
hid
sd_mod
crc_t10dif
crct10dif_generic
crct10dif_pclmul
crct10dif_common
crc32_pclmul
crc32c_intel
rtsx_pci_sdmmc
mmc_core
ghash_clmulni_intel
aesni_intel
aes_x86_64
lrw
gf128mul
glue_helper
ablk_helper
cryptd
ahci
libahci
libata
xhci_hcd
scsi_mod
rtsx_pci
mfd_core
usbcore
usb_common
thermal
thermal_sys

** PCI devices:
00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller [8086:0a04] (rev 09)
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: <access denied>

00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 61
	Region 0: Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at 3000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: i915

00:03.0 Audio device [0403]: Intel Corporation Haswell-ULT HD Audio Controller [8086:0a0c] (rev 09)
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 63
	Region 0: Memory at f0610000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: snd_hda_intel

00:14.0 USB controller [0c03]: Intel Corporation 8 Series USB xHCI HC [8086:9c31] (rev 04) (prog-if 30 [XHCI])
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 57
	Region 0: Memory at f0600000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: <access denied>
	Kernel driver in use: xhci_hcd

00:16.0 Communication controller [0780]: Intel Corporation 8 Series HECI #0 [8086:9c3a] (rev 04)
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 59
	Region 0: Memory at f0619000 (64-bit, non-prefetchable) [size=32]
	Capabilities: <access denied>
	Kernel driver in use: mei_me

00:1b.0 Audio device [0403]: Intel Corporation 8 Series HD Audio Controller [8086:9c20] (rev 04)
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 62
	Region 0: Memory at f0614000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: snd_hda_intel

00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series PCI Express Root Port 1 [8086:9c10] (rev e4) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.2 PCI bridge [0604]: Intel Corporation 8 Series PCI Express Root Port 3 [8086:9c14] (rev e4) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
	Memory behind bridge: f0500000-f05fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.3 PCI bridge [0604]: Intel Corporation 8 Series PCI Express Root Port 4 [8086:9c16] (rev e4) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=05, subordinate=05, sec-latency=0
	Memory behind bridge: f0400000-f04fffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1f.0 ISA bridge [0601]: Intel Corporation 8 Series LPC Controller [8086:9c43] (rev 04)
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: <access denied>
	Kernel driver in use: lpc_ich

00:1f.2 SATA controller [0106]: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] [8086:9c03] (rev 04) (prog-if 01 [AHCI 1.0])
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 58
	Region 0: I/O ports at 3088 [size=8]
	Region 1: I/O ports at 3094 [size=4]
	Region 2: I/O ports at 3080 [size=8]
	Region 3: I/O ports at 3090 [size=4]
	Region 4: I/O ports at 3060 [size=32]
	Region 5: Memory at f061c000 (32-bit, non-prefetchable) [size=2K]
	Capabilities: <access denied>
	Kernel driver in use: ahci

00:1f.3 SMBus [0c05]: Intel Corporation 8 Series SMBus Controller [8086:9c22] (rev 04)
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin C routed to IRQ 18
	Region 0: Memory at f0618000 (64-bit, non-prefetchable) [size=256]
	Region 4: I/O ports at efa0 [size=32]

04:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 83)
	Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4270]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 60
	Region 0: Memory at f0500000 (64-bit, non-prefetchable) [size=8K]
	Capabilities: <access denied>
	Kernel driver in use: iwlwifi

05:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader [10ec:5227] (rev 01)
	Subsystem: Lenovo Device [17aa:2217]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 56
	Region 0: Memory at f0400000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: <access denied>
	Kernel driver in use: rtsx_pci


** USB devices:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 056a:00ec Wacom Co., Ltd 
Bus 001 Device 005: ID 0483:91d1 STMicroelectronics 
Bus 001 Device 004: ID 0bda:5720 Realtek Semiconductor Corp. 
Bus 001 Device 003: ID 04f3:0254 Elan Microelectronics Corp. 
Bus 001 Device 002: ID 8087:07dc Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages linux-image-3.16.0-4-amd64 depends on:
ii  debconf [debconf-2.0]                   1.5.55
ii  initramfs-tools [linux-initramfs-tool]  0.118
ii  kmod                                    18-3
ii  linux-base                              3.5

Versions of packages linux-image-3.16.0-4-amd64 recommends:
ii  firmware-linux-free  3.3
ii  irqbalance           1.0.6-3

Versions of packages linux-image-3.16.0-4-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  extlinux                3:6.03+dfsg-5
ii  grub-efi                2.02~beta2-20
ii  linux-doc-3.16          3.16.7-ckt4-1

Versions of packages linux-image-3.16.0-4-amd64 is related to:
pn  firmware-atheros        <none>
pn  firmware-bnx2           <none>
pn  firmware-bnx2x          <none>
pn  firmware-brcm80211      <none>
pn  firmware-intelwimax     <none>
pn  firmware-ipw2x00        <none>
pn  firmware-ivtv           <none>
ii  firmware-iwlwifi        0.43
pn  firmware-libertas       <none>
pn  firmware-linux          <none>
ii  firmware-linux-nonfree  0.43
pn  firmware-myricom        <none>
pn  firmware-netxen         <none>
pn  firmware-qlogic         <none>
pn  firmware-ralink         <none>
pn  firmware-realtek        <none>
pn  xen-hypervisor          <none>

-- debconf information:
  linux-image-3.16.0-4-amd64/postinst/mips-initrd-3.16.0-4-amd64:
  linux-image-3.16.0-4-amd64/prerm/removing-running-kernel-3.16.0-4-amd64: true
  linux-image-3.16.0-4-amd64/postinst/depmod-error-initrd-3.16.0-4-amd64: false

Attachment: dmesg.out.gz
Description: application/gzip

Attachment: signature.asc
Description: Digital signature


--- End Message ---
--- Begin Message --- 
Hi

This bug was filed for a very old kernel or the bug is old itself
without resolution.

If you can reproduce it with

- the current version in unstable/testing
- the latest kernel from backports

please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.

Regards,
Salvatore

--- End Message ---
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