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Message #32089
[Bug 1784665] Re: bcache: bch_allocator_thread(): hung task timeout
This bug was fixed in the package linux - 4.4.0-161.189
---------------
linux (4.4.0-161.189) xenial; urgency=medium
* xenial/linux: 4.4.0-161.189 -proposed tracker (LP: #1841544)
* flock not mediated by 'k' (LP: 1658219)
- Revert "UBUNTU: SAUCE: apparmor: flock mediation is not being, enforced on
cache check"
* Packaging resync (LP: #1786013)
- [Packaging] resync getabis
linux (4.4.0-160.188) xenial; urgency=medium
* xenial/linux: 4.4.0-160.188 -proposed tracker (LP: #1840021)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
* EeePC 1005px laptop backlight is off after system boot up (LP: #1837117)
- platform/x86: asus-wmi: Only Tell EC the OS will handle display hotkeys from
asus_nb_wmi
* CVE-2019-10638
- [Config] CONFIG_TEST_HASH=n
- siphash: add cryptographically secure PRF
- inet: switch IP ID generator to siphash
* Stacked onexec transitions fail when under NO NEW PRIVS restrictions
(LP: #1839037)
- SAUCE: apparmor: fix nnp subset check failure, when stacking
* AppArmor onexec transition causes WARN kernel stack trace (LP: #1838627)
- SAUCE: apparmor: fix audit failures when performing profile transitions
* flock not mediated by 'k' (LP: 1658219) // Ubuntu 16.04: read access
incorrectly implies 'm' rule (LP: 1838090)
- SAUCE: apparmor: flock mediation is not being, enforced on cache check
* bcache: bch_allocator_thread(): hung task timeout (LP: #1784665) // Tight
timeout for bcache removal causes spurious failures (LP: #1796292)
- SAUCE: bcache: fix deadlock in bcache_allocator
* bcache: bch_allocator_thread(): hung task timeout (LP: #1784665)
- bcache: improve bcache_reboot()
- bcache: add journal statistic
- bcache: fix high CPU occupancy during journal
- bcache: fix incorrect sysfs output value of strip size
- bcache: fix error return value in memory shrink
- bcache: fix using of loop variable in memory shrink
- bcache: Fix indentation
- bcache: Add __printf annotation to __bch_check_keys()
- bcache: Annotate switch fall-through
- bcache: Fix kernel-doc warnings
- bcache: Remove an unused variable
- bcache: Suppress more warnings about set-but-not-used variables
- bcache: Reduce the number of sparse complaints about lock imbalances
- bcache: Move couple of functions to sysfs.c
* CVE-2019-3900
- vhost: introduce vhost_vq_avail_empty()
- vhost_net: tx batching
- vhost_net: do not stall on zerocopy depletion
- vhost-net: set packet weight of tx polling to 2 * vq size
- vhost_net: use packet weight for rx handler, too
- vhost_net: introduce vhost_exceeds_weight()
- vhost: introduce vhost_exceeds_weight()
- vhost_net: fix possible infinite loop
- vhost: scsi: add weight support
* Xenial: ZFS deadlock in shrinker path with xattrs (LP: #1839521)
- SAUCE: (noup) Update zfs to 0.6.5.6-0ubuntu28
* CVE-2019-13648
- powerpc/tm: Fix oops on sigreturn on systems without TM
* CVE-2018-20856
- block: blk_init_allocated_queue() set q->fq as NULL in the fail case
* CVE-2019-14283
- floppy: fix out-of-bounds read in copy_buffer
* CVE-2019-14284
- floppy: fix div-by-zero in setup_format_params
* Xenial update: 4.4.186 upstream stable release (LP: #1838467)
- Input: elantech - enable middle button support on 2 ThinkPads
- samples, bpf: fix to change the buffer size for read()
- mac80211: mesh: fix RCU warning
- dt-bindings: can: mcp251x: add mcp25625 support
- can: mcp251x: add support for mcp25625
- Input: imx_keypad - make sure keyboard can always wake up system
- ARM: davinci: da850-evm: call regulator_has_full_constraints()
- ARM: davinci: da8xx: specify dma_coherent_mask for lcdc
- md: fix for divide error in status_resync
- bnx2x: Check if transceiver implements DDM before access
- udf: Fix incorrect final NOT_ALLOCATED (hole) extent length
- x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()
- x86/tls: Fix possible spectre-v1 in do_get_thread_area()
- mwifiex: Abort at too short BSS descriptor element
- fscrypt: don't set policy for a dead directory
- mwifiex: Don't abort on small, spec-compliant vendor IEs
- USB: serial: ftdi_sio: add ID for isodebug v1
- USB: serial: option: add support for GosunCn ME3630 RNDIS mode
- usb: gadget: ether: Fix race between gether_disconnect and rx_submit
- usb: renesas_usbhs: add a workaround for a race condition of workqueue
- staging: comedi: dt282x: fix a null pointer deref on interrupt
- staging: comedi: amplc_pci230: fix null pointer deref on interrupt
- carl9170: fix misuse of device driver API
- VMCI: Fix integer overflow in VMCI handle arrays
- MIPS: Remove superfluous check for __linux__
- e1000e: start network tx queue only when link is up
- perf/core: Fix perf_sample_regs_user() mm check
- ARM: omap2: remove incorrect __init annotation
- be2net: fix link failure after ethtool offline test
- ppp: mppe: Add softdep to arc4
- sis900: fix TX completion
- dm verity: use message limit for data block corruption message
- kvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR
- ARC: hide unused function unw_hdr_alloc
- s390: fix stfle zero padding
- s390/qdio: (re-)initialize tiqdio list entries
- s390/qdio: don't touch the dsci in tiqdio_add_input_queues()
- KVM: x86: protect KVM_CREATE_PIT/KVM_CREATE_PIT2 with kvm->lock
- Linux 4.4.186
-- Stefan Bader <stefan.bader@xxxxxxxxxxxxx> Tue, 27 Aug 2019 09:49:19
+0200
** Changed in: linux (Ubuntu Xenial)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-20856
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2019-10638
--
You received this bug notification because you are a member of नेपाली
भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1784665
Title:
bcache: bch_allocator_thread(): hung task timeout
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Disco:
Fix Released
Status in linux source package in Eoan:
Fix Released
Bug description:
[Impact]
bcache_allocator() can call the following:
bch_allocator_thread()
-> bch_prio_write()
-> bch_bucket_alloc()
-> wait on &ca->set->bucket_wait
But the wake up event on bucket_wait is supposed to come from bch_allocator_thread() itself causing a deadlock.
[Test Case]
This is a simple script that can easily trigger the deadlock condition:
https://launchpadlibrarian.net/381282009/bcache-basic-repro.sh
A better test case has been also provided in bug 1796292 (duplicate of this bug):
https://bugs.launchpad.net/curtin/+bug/1796292/+attachment/5280353/+files/curtin-nvme.sh
[Fix]
Fix by making the call to bch_prio_write() non-blocking, so that
bch_allocator_thread() never waits on itself. Moreover, make sure to
wake up the garbage collector thread when bch_prio_write() is failing
to allocate buckets to increase the chance of freeing up more buckets.
In addition to that it would be safe to also import other upstream
bcache fixes (all clean cherry picks):
7e865eba00a3df2dc8c4746173a8ca1c1c7f042e bcache: fix potential deadlock in cached_def_free()
80265d8dfd77792e133793cef44a21323aac2908 bcache: acquire bch_register_lock later in cached_dev_free()
ce4c3e19e5201424357a0c82176633b32a98d2ec bcache: Replace bch_read_string_list() by __sysfs_match_string()
ecb37ce9baac653cc09e2b631393dde3df82979f bcache: Move couple of functions to sysfs.c
04cbc21137bfa4d7b8771a5b14f3d6c9b2aee671 bcache: Move couple of string arrays to sysfs.c
5f2b18ec8e1643410a2369f06888951cdedea0bf bcache: Fix a compiler warning in bcache_device_init()
20d3a518713e394efa5a899c84574b4b79ec5098 bcache: Reduce the number of sparse complaints about lock imbalances
42361469ae84c851e40cb1f94c8c9a14cdd94039 bcache: Suppress more warnings about set-but-not-used variables
f0d3814090ac77de94c42b7124c37ece23629197 bcache: Remove an unused variable
47344e330eabc1515cbe6061eb337100a3ab6d37 bcache: Fix kernel-doc warnings
9dfbdec7b7fea1ff1b7b5d5d12980dbc7dca46c7 bcache: Annotate switch fall-through
4a4e443835a43a79113cc237c472c0d268eb1e1c bcache: Add __printf annotation to __bch_check_keys()
fd01991d5c20098c5c1ffc4dca6c821cc60a2f74 bcache: Fix indentation
ca71df31661a0518ed58a1a59cf1993962153ebb bcache: fix using of loop variable in memory shrink
f3641c3abd1da978ee969b0203b71b86ec1bfa93 bcache: fix error return value in memory shrink
688892b3bc05e25da94866e32210e5f503f16f69 bcache: fix incorrect sysfs output value of strip size
09a44ca2114737e0932257619c16a2b50c7807f1 bcache: use pr_info() to inform duplicated CACHE_SET_IO_DISABLE set
c4dc2497d50d9c6fb16aa0d07b6a14f3b2adb1e0 bcache: fix high CPU occupancy during journal
a728eacbbdd229d1d903e46261c57d5206f87a4a bcache: add journal statistic
616486ab52ab7f9739b066d958bdd20e65aefd74 bcache: fix writeback target calc on large devices
1f0ffa67349c56ea54c03ccfd1e073c990e7411e bcache: only set BCACHE_DEV_WB_RUNNING when cached device attached
eb8cbb6df38f6e5124a3d5f1f8a3dbf519537c60 bcache: improve bcache_reboot()
9951379b0ca88c95876ad9778b9099e19a95d566 bcache: never writeback a discard operation
[Regression Potential]
The upstream fixes are all clean cherry picks from stable (most of
them are small cleanups), so regression potential is minimal.
The only special patch is "UBUNTU: SAUCE: bcache: fix deadlock in
bcache_allocator()" that is addressing the main deadlock bug (that
seems to be a mainline bug - not fixed yet). We should spend more time
trying to reproduce this deadlock with a mainline kernel and post the
patch to the LKML for review / feedback.
However, considering that this patch seems to fix/prevent the specific
deadlock problem reported in this bug (tested on the affected
platform) it can be considered safe to apply it.
[Original Bug Report]
$ cat /proc/version_signature
Ubuntu 4.15.0-29.31-generic 4.15.18
$ lsb_release -rd
Description: Ubuntu Cosmic Cuttlefish (development branch)
Release: 18.10
$ apt-cache policy linux-image-`uname -r`
linux-image-4.15.0-29-generic:
Installed: 4.15.0-29.31
Candidate: 4.15.0-29.31
Version table:
*** 4.15.0-29.31 500
500 http://archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
100 /var/lib/dpkg/status
3) mkfs.ext4 /dev/bcache0 returns successful creating an ext4
filesystem on top of a bcache device
4) mkfs.ext4 doesn't return and kernel prints hung process info
[ 58.018099] cloud-init[920]: Running command ['mkfs.ext4', '-F', '-L', 'root-fs', '-U', 'f01aec97-9457-11e8-b8d6-525400123401', '/dev/bcache0'] with allowed return codes [0] (capture=True)
[ 242.652018] INFO: task kworker/u4:0:5 blocked for more than 120 seconds.
[ 242.653767] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.655391] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.657397] INFO: task kworker/0:2:410 blocked for more than 120 seconds.
[ 242.659126] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.660980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.663000] INFO: task bcache_allocato:2326 blocked for more than 120 seconds.
[ 242.664807] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.666516] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.668503] INFO: task bcache_writebac:2345 blocked for more than 120 seconds.
[ 242.670301] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.671936] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.673909] INFO: task mkfs.ext4:2803 blocked for more than 120 seconds.
[ 242.675414] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 242.677038] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 363.483998] INFO: task kworker/u4:0:5 blocked for more than 120 seconds.
[ 363.488441] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.489598] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 363.491043] INFO: task kworker/0:2:410 blocked for more than 120 seconds.
[ 363.492252] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.494085] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 363.495659] INFO: task bcache_allocato:2326 blocked for more than 120 seconds.
[ 363.496957] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.498454] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 363.499866] INFO: task bcache_writebac:2345 blocked for more than 120 seconds.
[ 363.501156] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.502597] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 363.504048] INFO: task mkfs.ext4:2803 blocked for more than 120 seconds.
[ 363.505505] Tainted: P O 4.15.0-29-generic #31-Ubuntu
[ 363.506677] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
System has two virtio block devices. bcache was created like so:
make-bcache -C /dev/vdb
make-bcache -B /dev/vda2
resulting in /dev/bcache0
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.15.0-29-generic 4.15.0-29.31
ProcVersionSignature: User Name 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 31 15:52 seq
crw-rw---- 1 root audio 116, 33 Jul 31 15:52 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.10-0ubuntu7
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
Date: Tue Jul 31 15:53:56 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
RelatedPackageVersions:
linux-restricted-modules-4.15.0-29-generic N/A
linux-backports-modules-4.15.0-29-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.11.1-1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-bionic
dmi.modalias: dmi:bvnSeaBIOS:bvr1.11.1-1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-bionic:cvnQEMU:ct1:cvrpc-i440fx-bionic:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-bionic
dmi.sys.vendor: QEMU
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