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Message #27055
[Bug 1798110] Re: xenial: virtio-scsi: CPU soft lockup due to loop in virtscsi_target_destroy()
This bug was fixed in the package linux - 4.4.0-139.165
---------------
linux (4.4.0-139.165) xenial; urgency=medium
* linux: 4.4.0-139.165 -proposed tracker (LP: #1799401)
* Kernel panic after the ubuntu_nbd_smoke_test on Xenial kernel (LP: #1793464)
- nbd: Remove signal usage
- nbd: Timeouts are not user requested disconnects
- nbd: Cleanup reset of nbd and bdev after a disconnect
- nbd: don't shutdown sock with irq's disabled
- nbd: fix race in ioctl
* fscache: bad refcounting in fscache_op_complete leads to OOPS (LP: #1797314)
- SAUCE: fscache: Fix race in decrementing refcount of op->npages
* xenial: virtio-scsi: CPU soft lockup due to loop in
virtscsi_target_destroy() (LP: #1798110)
- SAUCE: (no-up) virtio-scsi: Decrement reqs counter before SCSI command
requeue
* Error reported when creating ZFS pool with "-t" option, despite successful
pool creation (LP: #1769937)
- SAUCE: (noup) Update zfs to 0.6.5.6-0ubuntu26
* Xenial update: 4.4.160 upstream stable release (LP: #1798770)
- crypto: skcipher - Fix -Wstringop-truncation warnings
- tsl2550: fix lux1_input error in low light
- vmci: type promotion bug in qp_host_get_user_memory()
- x86/numa_emulation: Fix emulated-to-physical node mapping
- staging: rts5208: fix missing error check on call to rtsx_write_register
- uwb: hwa-rc: fix memory leak at probe
- power: vexpress: fix corruption in notifier registration
- Bluetooth: Add a new Realtek 8723DE ID 0bda:b009
- USB: serial: kobil_sct: fix modem-status error handling
- 6lowpan: iphc: reset mac_header after decompress to fix panic
- md-cluster: clear another node's suspend_area after the copy is finished
- media: exynos4-is: Prevent NULL pointer dereference in __isp_video_try_fmt()
- powerpc/kdump: Handle crashkernel memory reservation failure
- media: fsl-viu: fix error handling in viu_of_probe()
- x86/tsc: Add missing header to tsc_msr.c
- x86/entry/64: Add two more instruction suffixes
- scsi: target/iscsi: Make iscsit_ta_authentication() respect the output
buffer size
- scsi: klist: Make it safe to use klists in atomic context
- scsi: ibmvscsi: Improve strings handling
- usb: wusbcore: security: cast sizeof to int for comparison
- powerpc/powernv/ioda2: Reduce upper limit for DMA window size
- alarmtimer: Prevent overflow for relative nanosleep
- s390/extmem: fix gcc 8 stringop-overflow warning
- ALSA: snd-aoa: add of_node_put() in error path
- media: s3c-camif: ignore -ENOIOCTLCMD from v4l2_subdev_call for s_power
- media: soc_camera: ov772x: correct setting of banding filter
- media: omap3isp: zero-initialize the isp cam_xclk{a,b} initial data
- staging: android: ashmem: Fix mmap size validation
- drivers/tty: add error handling for pcmcia_loop_config
- media: tm6000: add error handling for dvb_register_adapter
- ALSA: hda: Add AZX_DCAPS_PM_RUNTIME for AMD Raven Ridge
- ath10k: protect ath10k_htt_rx_ring_free with rx_ring.lock
- rndis_wlan: potential buffer overflow in rndis_wlan_auth_indication()
- wlcore: Add missing PM call for wlcore_cmd_wait_for_event_or_timeout()
- ARM: mvebu: declare asm symbols as character arrays in pmsu.c
- HID: hid-ntrig: add error handling for sysfs_create_group
- scsi: bnx2i: add error handling for ioremap_nocache
- EDAC, i7core: Fix memleaks and use-after-free on probe and remove
- ASoC: dapm: Fix potential DAI widget pointer deref when linking DAIs
- module: exclude SHN_UNDEF symbols from kallsyms api
- nfsd: fix corrupted reply to badly ordered compound
- ARM: dts: dra7: fix DCAN node addresses
- serial: cpm_uart: return immediately from console poll
- spi: tegra20-slink: explicitly enable/disable clock
- spi: sh-msiof: Fix invalid SPI use during system suspend
- spi: sh-msiof: Fix handling of write value for SISTR register
- spi: rspi: Fix invalid SPI use during system suspend
- spi: rspi: Fix interrupted DMA transfers
- USB: fix error handling in usb_driver_claim_interface()
- USB: handle NULL config in usb_find_alt_setting()
- slub: make ->cpu_partial unsigned int
- Revert "UBUNTU: SAUCE: media: uvcvideo: Support realtek's UVC 1.5 device"
- media: uvcvideo: Support realtek's UVC 1.5 device
- USB: usbdevfs: sanitize flags more
- USB: usbdevfs: restore warning for nonsensical flags
- Revert "usb: cdc-wdm: Fix a sleep-in-atomic-context bug in
service_outstanding_interrupt()"
- USB: remove LPM management from usb_driver_claim_interface()
- Input: elantech - enable middle button of touchpad on ThinkPad P72
- IB/srp: Avoid that sg_reset -d ${srp_device} triggers an infinite loop
- scsi: target: iscsi: Use bin2hex instead of a re-implementation
- serial: imx: restore handshaking irq for imx1
- arm64: KVM: Tighten guest core register access from userspace
- ext4: never move the system.data xattr out of the inode body
- thermal: of-thermal: disable passive polling when thermal zone is disabled
- net: hns: fix length and page_offset overflow when CONFIG_ARM64_64K_PAGES
- e1000: check on netif_running() before calling e1000_up()
- e1000: ensure to free old tx/rx rings in set_ringparam()
- hwmon: (ina2xx) fix sysfs shunt resistor read access
- hwmon: (adt7475) Make adt7475_read_word() return errors
- i2c: i801: Allow ACPI AML access I/O ports not reserved for SMBus
- arm64: cpufeature: Track 32bit EL0 support
- arm64: KVM: Sanitize PSTATE.M when being set from userspace
- media: v4l: event: Prevent freeing event subscriptions while accessed
- KVM: PPC: Book3S HV: Don't truncate HPTE index in xlate function
- mac80211: correct use of IEEE80211_VHT_CAP_RXSTBC_X
- mac80211_hwsim: correct use of IEEE80211_VHT_CAP_RXSTBC_X
- gpio: adp5588: Fix sleep-in-atomic-context bug
- mac80211: mesh: fix HWMP sequence numbering to follow standard
- cfg80211: nl80211_update_ft_ies() to validate NL80211_ATTR_IE
- RAID10 BUG_ON in raise_barrier when force is true and conf->barrier is 0
- i2c: uniphier: issue STOP only for last message or I2C_M_STOP
- i2c: uniphier-f: issue STOP only for last message or I2C_M_STOP
- net: cadence: Fix a sleep-in-atomic-context bug in macb_halt_tx()
- fs/cifs: don't translate SFM_SLASH (U+F026) to backslash
- cfg80211: fix a type issue in ieee80211_chandef_to_operating_class()
- mac80211: fix a race between restart and CSA flows
- mac80211: Fix station bandwidth setting after channel switch
- mac80211: shorten the IBSS debug messages
- tools/vm/slabinfo.c: fix sign-compare warning
- tools/vm/page-types.c: fix "defined but not used" warning
- mm: madvise(MADV_DODUMP): allow hugetlbfs pages
- usb: gadget: fotg210-udc: Fix memory leak of fotg210->ep[i]
- perf probe powerpc: Ignore SyS symbols irrespective of endianness
- RDMA/ucma: check fd type in ucma_migrate_id()
- USB: yurex: Check for truncation in yurex_read()
- drm/nouveau/TBDdevinit: don't fail when PMU/PRE_OS is missing from VBIOS
- fs/cifs: suppress a string overflow warning
- dm thin metadata: try to avoid ever aborting transactions
- arch/hexagon: fix kernel/dma.c build warning
- hexagon: modify ffs() and fls() to return int
- arm64: jump_label.h: use asm_volatile_goto macro instead of "asm goto"
- r8169: Clear RTL_FLAG_TASK_*_PENDING when clearing RTL_FLAG_TASK_ENABLED
- s390/qeth: don't dump past end of unknown HW header
- cifs: read overflow in is_valid_oplock_break()
- xen/manage: don't complain about an empty value in control/sysrq node
- xen: avoid crash in disable_hotplug_cpu
- xen: fix GCC warning and remove duplicate EVTCHN_ROW/EVTCHN_COL usage
- smb2: fix missing files in root share directory listing
- crypto: mxs-dcp - Fix wait logic on chan threads
- proc: restrict kernel stack dumps to root
- ocfs2: fix locking for res->tracking and dlm->tracking_list
- dm thin metadata: fix __udivdi3 undefined on 32-bit
- Linux 4.4.160
* Volume control not working Dell XPS 27 (7760) (LP: #1775068) // Xenial
update: 4.4.160 upstream stable release (LP: #1798770)
- ALSA: hda/realtek - Cannot adjust speaker's volume on Dell XPS 27 7760
* Xenial update: 4.4.160 upstream stable release (LP: #1798770) //
CVE-2018-7755
- floppy: Do not copy a kernel pointer to user memory in FDGETPRM ioctl
* Xenial update: 4.4.159 upstream stable release (LP: #1798617)
- NFC: Fix possible memory corruption when handling SHDLC I-Frame commands
- NFC: Fix the number of pipes
- ASoC: cs4265: fix MMTLR Data switch control
- ALSA: bebob: use address returned by kmalloc() instead of kernel stack for
streaming DMA mapping
- ALSA: emu10k1: fix possible info leak to userspace on
SNDRV_EMU10K1_IOCTL_INFO
- platform/x86: alienware-wmi: Correct a memory leak
- xen/netfront: don't bug in case of too many frags
- xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code
- ring-buffer: Allow for rescheduling when removing pages
- mm: shmem.c: Correctly annotate new inodes for lockdep
- gso_segment: Reset skb->mac_len after modifying network header
- ipv6: fix possible use-after-free in ip6_xmit()
- net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT
- net: hp100: fix always-true check for link up state
- neighbour: confirm neigh entries when ARP packet is received
- ocfs2: fix ocfs2 read block panic
- drm/nouveau/drm/nouveau: Use pm_runtime_get_noresume() in connector_detect()
- tty: vt_ioctl: fix potential Spectre v1
- ext4: avoid divide by zero fault when deleting corrupted inline directories
- ext4: recalucate superblock checksum after updating free blocks/inodes
- ext4: fix online resize's handling of a too-small final block group
- ext4: fix online resizing for bigalloc file systems with a 1k block size
- ext4: don't mark mmp buffer head dirty
- arm64: Add trace_hardirqs_off annotation in ret_to_user
- HID: sony: Update device ids
- HID: sony: Support DS4 dongle
- iw_cxgb4: only allow 1 flush on user qps
- Linux 4.4.159
* Xenial update: 4.4.158 upstream stable release (LP: #1798587)
- iommu/arm-smmu-v3: sync the OVACKFLG to PRIQ consumer register
- ALSA: msnd: Fix the default sample sizes
- ALSA: usb-audio: Fix multiple definitions in AU0828_DEVICE() macro
- xfrm: fix 'passing zero to ERR_PTR()' warning
- gfs2: Special-case rindex for gfs2_grow
- clk: imx6ul: fix missing of_node_put()
- kbuild: add .DELETE_ON_ERROR special target
- dmaengine: pl330: fix irq race with terminate_all
- MIPS: ath79: fix system restart
- media: videobuf2-core: check for q->error in vb2_core_qbuf()
- mtd/maps: fix solutionengine.c printk format warnings
- fbdev: omapfb: off by one in omapfb_register_client()
- video: goldfishfb: fix memory leak on driver remove
- fbdev/via: fix defined but not used warning
- perf powerpc: Fix callchain ip filtering when return address is in a
register
- fbdev: Distinguish between interlaced and progressive modes
- ARM: exynos: Clear global variable on init error path
- perf powerpc: Fix callchain ip filtering
- powerpc/powernv: opal_put_chars partial write fix
- MIPS: jz4740: Bump zload address
- mac80211: restrict delayed tailroom needed decrement
- xen-netfront: fix queue name setting
- arm64: dts: qcom: db410c: Fix Bluetooth LED trigger
- s390/qeth: fix race in used-buffer accounting
- s390/qeth: reset layer2 attribute on layer switch
- platform/x86: toshiba_acpi: Fix defined but not used build warnings
- crypto: sharah - Unregister correct algorithms for SAHARA 3
- xen-netfront: fix warn message as irq device name has '/'
- RDMA/cma: Protect cma dev list with lock
- pstore: Fix incorrect persistent ram buffer mapping
- xen/netfront: fix waiting for xenbus state change
- IB/ipoib: Avoid a race condition between start_xmit and cm_rep_handler
- Tools: hv: Fix a bug in the key delete code
- misc: hmc6352: fix potential Spectre v1
- usb: Don't die twice if PCI xhci host is not responding in resume
- USB: Add quirk to support DJI CineSSD
- usb: Avoid use-after-free by flushing endpoints early in usb_set_interface()
- usb: host: u132-hcd: Fix a sleep-in-atomic-context bug in u132_get_frame()
- USB: add quirk for WORLDE Controller KS49 or Prodipe MIDI 49C USB controller
- USB: net2280: Fix erroneous synchronization change
- USB: serial: io_ti: fix array underflow in completion handler
- usb: misc: uss720: Fix two sleep-in-atomic-context bugs
- USB: yurex: Fix buffer over-read in yurex_write()
- usb: cdc-wdm: Fix a sleep-in-atomic-context bug in
service_outstanding_interrupt()
- cifs: prevent integer overflow in nxt_dir_entry()
- CIFS: fix wrapping bugs in num_entries()
- binfmt_elf: Respect error return from `regset->active'
- audit: fix use-after-free in audit_add_watch
- mtdchar: fix overflows in adjustment of `count`
- MIPS: loongson64: cs5536: Fix PCI_OHCI_INT_REG reads
- ARM: hisi: handle of_iomap and fix missing of_node_put
- ARM: hisi: fix error handling and missing of_node_put
- ARM: hisi: check of_iomap and fix missing of_node_put
- drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping
- parport: sunbpp: fix error return code
- coresight: Handle errors in finding input/output ports
- coresight: tpiu: Fix disabling timeouts
- gpiolib: Mark gpio_suffixes array with __maybe_unused
- drm/amdkfd: Fix error codes in kfd_get_process
- rtc: bq4802: add error handling for devm_ioremap
- ALSA: pcm: Fix snd_interval_refine first/last with open min/max
- selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET/other clock
adjustments are in progress
- drm/panel: type promotion bug in s6e8aa0_read_mtp_id()
- pinctrl: qcom: spmi-gpio: Fix pmic_gpio_config_get() to be compliant
- USB: serial: ti_usb_3410_5052: fix array underflow in completion handler
- mei: bus: type promotion bug in mei_nfc_if_version()
- drivers: net: cpsw: fix segfault in case of bad phy-handle
- MIPS: VDSO: Match data page cache colouring when D$ aliases
- Linux 4.4.158
* Xenial update: 4.4.157 upstream stable release (LP: #1798539)
- i2c: xiic: Make the start and the byte count write atomic
- i2c: i801: fix DNV's SMBCTRL register offset
- ALSA: hda - Fix cancel_work_sync() stall from jackpoll work
- cfq: Give a chance for arming slice idle timer in case of group_idle
- kthread: Fix use-after-free if kthread fork fails
- kthread: fix boot hang (regression) on MIPS/OpenRISC
- staging: rt5208: Fix a sleep-in-atomic bug in xd_copy_page
- staging/rts5208: Fix read overflow in memcpy
- block,blkcg: use __GFP_NOWARN for best-effort allocations in blkcg
- locking/rwsem-xadd: Fix missed wakeup due to reordering of load
- selinux: use GFP_NOWAIT in the AVC kmem_caches
- locking/osq_lock: Fix osq_lock queue corruption
- ARC: [plat-axs*]: Enable SWAP
- misc: mic: SCIF Fix scif_get_new_port() error handling
- ethtool: Remove trailing semicolon for static inline
- gpio: tegra: Move driver registration to subsys_init level
- scsi: target: fix __transport_register_session locking
- md/raid5: fix data corruption of replacements after originals dropped
- misc: ti-st: Fix memory leak in the error path of probe()
- uio: potential double frees if __uio_register_device() fails
- tty: rocket: Fix possible buffer overwrite on register_PCI
- f2fs: do not set free of current section
- perf tools: Allow overriding MAX_NR_CPUS at compile time
- NFSv4.0 fix client reference leak in callback
- macintosh/via-pmu: Add missing mmio accessors
- ath10k: prevent active scans on potential unusable channels
- MIPS: Fix ISA virt/bus conversion for non-zero PHYS_OFFSET
- ata: libahci: Correct setting of DEVSLP register
- scsi: 3ware: fix return 0 on the error path of probe
- ath10k: disable bundle mgmt tx completion event support
- Bluetooth: hidp: Fix handling of strncpy for hid->name information
- x86/mm: Remove in_nmi() warning from vmalloc_fault()
- gpio: ml-ioh: Fix buffer underwrite on probe error path
- net: mvneta: fix mtu change on port without link
- MIPS: Octeon: add missing of_node_put()
- net: dcb: For wild-card lookups, use priority -1, not 0
- Input: atmel_mxt_ts - only use first T9 instance
- iommu/ipmmu-vmsa: Fix allocation in atomic context
- mfd: ti_am335x_tscadc: Fix struct clk memory leak
- f2fs: fix to do sanity check with {sit,nat}_ver_bitmap_bytesize
- MIPS: WARN_ON invalid DMA cache maintenance, not BUG_ON
- RDMA/cma: Do not ignore net namespace for unbound cm_id
- xhci: Fix use-after-free in xhci_free_virt_device
- vmw_balloon: include asm/io.h
- netfilter: x_tables: avoid stack-out-of-bounds read in
xt_copy_counters_from_user
- drivers: net: cpsw: fix parsing of phy-handle DT property in dual_emac
config
- net: ethernet: ti: cpsw: fix mdio device reference leak
- ethernet: ti: davinci_emac: add missing of_node_put after calling
of_parse_phandle
- crypto: vmx - Fix sleep-in-atomic bugs
- mtd: ubi: wl: Fix error return code in ubi_wl_init()
- autofs: fix autofs_sbi() does not check super block type
- Linux 4.4.157
* Xenial update: 4.4.156 upstream stable release (LP: #1797563)
- staging: android: ion: fix ION_IOC_{MAP,SHARE} use-after-free
- net: bcmgenet: use MAC link status for fixed phy
- qlge: Fix netdev features configuration.
- tcp: do not restart timewait timer on rst reception
- vti6: remove !skb->ignore_df check from vti6_xmit()
- cifs: check if SMB2 PDU size has been padded and suppress the warning
- hfsplus: don't return 0 when fill_super() failed
- hfs: prevent crash on exit from failed search
- fork: don't copy inconsistent signal handler state to child
- reiserfs: change j_timestamp type to time64_t
- hfsplus: fix NULL dereference in hfsplus_lookup()
- fat: validate ->i_start before using
- scripts: modpost: check memory allocation results
- mm/fadvise.c: fix signed overflow UBSAN complaint
- fs/dcache.c: fix kmemcheck splat at take_dentry_name_snapshot()
- ipvs: fix race between ip_vs_conn_new() and ip_vs_del_dest()
- mfd: sm501: Set coherent_dma_mask when creating subdevices
- platform/x86: asus-nb-wmi: Add keymap entry for lid flip action on UX360
- irqchip/bcm7038-l1: Hide cpu offline callback when building for !SMP
- net/9p: fix error path of p9_virtio_probe
- powerpc: Fix size calculation using resource_size()
- s390/dasd: fix hanging offline processing due to canceled worker
- scsi: aic94xx: fix an error code in aic94xx_init()
- PCI: mvebu: Fix I/O space end address calculation
- dm kcopyd: avoid softlockup in run_complete_job
- staging: comedi: ni_mio_common: fix subdevice flags for PFI subdevice
- selftests/powerpc: Kill child processes on SIGINT
- smb3: fix reset of bytes read and written stats
- SMB3: Number of requests sent should be displayed for SMB3 not just CIFS
- powerpc/pseries: Avoid using the size greater than RTAS_ERROR_LOG_MAX.
- btrfs: replace: Reset on-disk dev stats value after replace
- btrfs: relocation: Only remove reloc rb_trees if reloc control has been
initialized
- btrfs: Don't remove block group that still has pinned down bytes
- debugobjects: Make stack check warning more informative
- x86/pae: use 64 bit atomic xchg function in native_ptep_get_and_clear
- kbuild: make missing $DEPMOD a Warning instead of an Error
- Revert "ARM: imx_v6_v7_defconfig: Select ULPI support"
- enic: do not call enic_change_mtu in enic_probe
- Fixes: Commit cdbf92675fad ("mm: numa: avoid waiting on freed migrated
pages")
- genirq: Delay incrementing interrupt count if it's disabled/pending
- irqchip/gic-v3-its: Recompute the number of pages on page size change
- irqchip/gicv3-its: Fix memory leak in its_free_tables()
- irqchip/gicv3-its: Avoid cache flush beyond ITS_BASERn memory size
- irqchip/gic-v3: Add missing barrier to 32bit version of gic_read_iar()
- irqchip/gic: Make interrupt ID 1020 invalid
- ovl: rename is_merge to is_lowest
- ovl: override creds with the ones from the superblock mounter
- ovl: proper cleanup of workdir
- sch_htb: fix crash on init failure
- sch_multiq: fix double free on init failure
- sch_hhf: fix null pointer dereference on init failure
- sch_netem: avoid null pointer deref on init failure
- sch_tbf: fix two null pointer dereferences on init failure
- mei: me: allow runtime pm for platform with D0i3
- ASoC: wm8994: Fix missing break in switch
- btrfs: use correct compare function of dirty_metadata_bytes
- Linux 4.4.156
-- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx> Wed, 24 Oct
2018 09:57:17 +0000
** Changed in: linux (Ubuntu Xenial)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-7755
--
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1798110
Title:
xenial: virtio-scsi: CPU soft lockup due to loop in
virtscsi_target_destroy()
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Xenial:
Fix Released
Bug description:
[Impact]
* Detaching virtio-scsi disk in Xenial guest can cause
CPU soft lockup in guest (and take 100% CPU in host).
* It may prevent further progress on other tasks that
depend on resources locked earlier in the SCSI target
removal stack, and/or impact other SCSI functionality.
* The fix resolves a corner case in the requests counter
in the virtio SCSI target, which impacts a downstream
(SAUCE) patch in the virtio-scsi target removal handler
that depends on the requests counter value to be zero.
[Test Case]
* See LP #1798110 (this bug)'s comment #3 (too long for
this section -- synthetic case with GDB+QEMU) and
comment #4 (organic test case in cloud instance).
[Regression Potential]
* It seem low -- this only affects the SCSI command requeue
path with regards to the reference counter, which is only
used with real chance of problems in our downstream patch
(which is now passing this testcase).
* The other less serious issue would be decrementing it to
a negative / < 0 value, which is not possible with this
driver logic (see commit message), because the reqs counter
is always incremented before calling virtscsi_queuecommand(),
where this decrement operation is inserted.
[Original Description]
A customer reported a CPU soft lockup on Trusty HWE kernel from Xenial
when detaching a virtio-scsi drive, and provided a crashdump that shows
2 things:
1) The soft locked up CPU is waiting for another CPU to finish something,
and that does not happen because the other CPU is infinitely looping in
virtscsi_target_destroy().
2) The loop happens because the 'tgt->reqs' counter is non-zero, and that
probably happened due to a missing decrement in SCSI command requeue path,
exercised when the virtio ring is full.
The reported problem itself happens because of a downstream/SAUCE patch,
coupled with the problem of the missing decrement for the reqs counter.
Introducing a decrement in the SCSI command requeue path resolves the
problem, verified synthetically with QEMU+GDB and with test-case/loop
provided by the customer as problem reproducer.
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