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Thu, 15 Jun 2023 15:07:53 -0700 (PDT) Date: Thu, 15 Jun 2023 16:07:48 -0600 From: Yu Zhao To: Nathan Chancellor , Hugh Dickins Cc: Hugh Dickins , Andrew Morton , Mike Kravetz , Mike Rapoport , "Kirill A. Shutemov" , Matthew Wilcox , David Hildenbrand , Suren Baghdasaryan , Qi Zheng , Peter Zijlstra , Russell King , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Greg Ungerer , Michal Simek , Thomas Bogendoerfer , Helge Deller , John David Anglin , "Aneesh Kumar K.V" , Michael Ellerman , Alexandre Ghiti , Palmer Dabbelt , Heiko Carstens , Christian Borntraeger , Claudio Imbrenda , Alexander Gordeev , John Paul Adrian Glaubitz , "David S. Miller" , Chris Zankel , Max Filippov , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 07/23] mips: update_mmu_cache() can replace __update_tlb() Message-ID: References: <178970b0-1539-8aac-76fd-972c6c46ec17@google.com> <20230614231758.GA1503611@dev-arch.thelio-3990X> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230614231758.GA1503611@dev-arch.thelio-3990X> X-Stat-Signature: odd7i1fx48wh5tn49u4s1hxcssadfzsp X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: CB73516001E X-Rspam-User: X-HE-Tag: 1686866874-261988 X-HE-Meta: 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 rZuXrcty 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jun 14, 2023 at 04:17:58PM -0700, Nathan Chancellor wrote: > Hi Hugh, > > On Thu, Jun 08, 2023 at 12:17:24PM -0700, Hugh Dickins wrote: > > Don't make update_mmu_cache() a wrapper around __update_tlb(): call it > > directly, and use the ptep (or pmdp) provided by the caller, instead of > > re-calling pte_offset_map() - which would raise a question of whether a > > pte_unmap() is needed to balance it. > > > > Check whether the "ptep" provided by the caller is actually the pmdp, > > instead of testing pmd_huge(): or test pmd_huge() too and warn if it > > disagrees? This is "hazardous" territory: needs review and testing. > > > > Signed-off-by: Hugh Dickins > > --- > > arch/mips/include/asm/pgtable.h | 15 +++------------ > > arch/mips/mm/tlb-r3k.c | 5 +++-- > > arch/mips/mm/tlb-r4k.c | 9 +++------ > > 3 files changed, 9 insertions(+), 20 deletions(-) > > > > I just bisected a crash while powering down a MIPS machine in QEMU to > this change as commit 8044511d3893 ("mips: update_mmu_cache() can > replace __update_tlb()") in linux-next. Unfortunately, I can still > reproduce it with the existing fix you have for this change on the > mailing list, which is present in next-20230614. > > I can reproduce it with the GCC 13.1.0 on kernel.org [1]. > > $ make -skj"$(nproc)" ARCH=mips CROSS_COMPILE=mips-linux- mrproper malta_defconfig vmlinux > > $ qemu-system-mipsel \ > -display none \ > -nodefaults \ > -cpu 24Kf \ > -machine malta \ > -kernel vmlinux \ > -initrd rootfs.cpio \ > -m 512m \ > -serial mon:stdio > ... > Linux version 6.4.0-rc6-next-20230614 (nathan@dev-arch.thelio-3990X) (mips-linux-gcc (GCC) 13.1.0, GNU ld (GNU Binutils) 2.40) #1 SMP Wed Jun 14 16:13:02 MST 2023 > ... > Run /init as init process > process '/bin/busybox' started with executable stack > do_page_fault(): sending SIGSEGV to init for invalid read access from 0000003c > epc = 77b893dc in ld-uClibc-1.0.39.so[77b84000+8000] > ra = 77b8930c in ld-uClibc-1.0.39.so[77b84000+8000] > Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b > ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]--- > > The rootfs is available at [2] if it is needed. I am more than happy to > provide additional information or test patches if necessary. > > [1]: https://mirrors.edge.kernel.org/pub/tools/crosstool/ > [2]: https://github.com/ClangBuiltLinux/boot-utils/releases/download/20230609-194440/mipsel-rootfs.cpio.zst Seeing this on real h/w as well (just to confirm). Linux version 6.4.0-rc4-00437-g4bab5c42a698 (root@yuzhao.bld.corp.google.com) (mips64el-linux-gnuabi64-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40) #3 SMP PREEMPT Thu Jun 15 01:05:20 MDT 2023 Skipping L2 locking due to reduced L2 cache size CVMSEG size: 2 cache lines (256 bytes) printk: bootconsole [early0] enabled CPU0 revision is: 000d9602 (Cavium Octeon III) FPU revision is: 00739600 Kernel sections are not in the memory maps Wasting 243712 bytes for tracking 4352 unused pages Initrd not found or empty - disabling initrd Using passed Device Tree. software IO TLB: SWIOTLB bounce buffer size adjusted to 0MB software IO TLB: area num 1. software IO TLB: mapped [mem 0x000000000370d000-0x000000000374d000] (0MB) Primary instruction cache 78kB, virtually tagged, 39 way, 16 sets, linesize 128 bytes. Primary data cache 32kB, 32-way, 8 sets, linesize 128 bytes. Zone ranges: DMA32 [mem 0x0000000001100000-0x00000000efffffff] Normal empty Movable zone start for each node Early memory node ranges node 0: [mem 0x0000000001100000-0x0000000003646fff] node 0: [mem 0x0000000003700000-0x000000000fafffff] node 0: [mem 0x0000000020000000-0x000000004ebfffff] Initmem setup node 0 [mem 0x0000000001100000-0x000000004ebfffff] On node 0, zone DMA32: 4352 pages in unavailable ranges On node 0, zone DMA32: 185 pages in unavailable ranges On node 0, zone DMA32: 1280 pages in unavailable ranges On node 0, zone DMA32: 5120 pages in unavailable ranges percpu: Embedded 15 pages/cpu s24368 r8192 d28880 u61440 pcpu-alloc: s24368 r8192 d28880 u61440 alloc=15*4096 pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 Kernel command line: loglevel=8 console=ttyS0,115200 printk: log_buf_len individual max cpu contribution: 4096 bytes printk: log_buf_len total cpu_extra contributions: 12288 bytes printk: log_buf_len min size: 16384 bytes printk: log_buf_len: 32768 bytes printk: early log buf free: 14184(86%) Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes, linear) Inode-cache hash table entries: 65536 (order: 7, 524288 bytes, linear) Built 1 zonelists, mobility grouping on. Total pages: 247772 mem auto-init: stack:all(zero), heap alloc:off, heap free:off Memory: 950032K/1004828K available (8058K kernel code, 575K rwdata, 1880K rodata, 27488K init, 158K bss, 54796K reserved, 0K cma-reserved) rcu: Preemptible hierarchical RCU implementation. rcu: RCU event tracing is enabled. rcu: RCU restricting CPUs from NR_CPUS=32 to nr_cpu_ids=4. rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4 NR_IRQS: 512 CIB interrupt controller probed: 800107000000e000 23 CIB interrupt controller probed: 800107000000e200 12 CIB interrupt controller probed: 800107000000e400 6 CIB interrupt controller probed: 800107000000ec00 15 CIB interrupt controller probed: 800107000000e600 4 CIB interrupt controller probed: 800107000000e800 11 CIB interrupt controller probed: 800107000000e900 11 rcu: srcu_init: Setting srcu_struct sizes based on contention. clocksource: OCTEON_CVMCOUNT: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns Calibrating delay loop (skipped) preset value.. 2000.00 BogoMIPS (lpj=10000000) pid_max: default: 32768 minimum: 301 LSM: initializing lsm=capability,integrity Mount-cache hash table entries: 2048 (order: 2, 16384 bytes, linear) Mountpoint-cache hash table entries: 2048 (order: 2, 16384 bytes, linear) rcu: Hierarchical SRCU implementation. rcu: Max phase no-delay instances is 1000. smp: Bringing up secondary CPUs ... SMP: Booting CPU01 (CoreId 1)... CPU1 revision is: 000d9602 (Cavium Octeon III) FPU revision is: 00739600 SMP: Booting CPU02 (CoreId 2)... CPU2 revision is: 000d9602 (Cavium Octeon III) FPU revision is: 00739600 SMP: Booting CPU03 (CoreId 3)... CPU3 revision is: 000d9602 (Cavium Octeon III) FPU revision is: 00739600 smp: Brought up 1 node, 4 CPUs devtmpfs: initialized clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns futex hash table entries: 1024 (order: 5, 131072 bytes, linear) NET: Registered PF_NETLINK/PF_ROUTE protocol family PCIe: Initializing port 0 PCIe: BIST2 FAILED for port 0 (0x0000000000000003) PCIe: Link timeout on port 0, probably the slot is empty PCIe: Initializing port 1 PCIe: BIST FAILED for port 1 (0xffffffffffffffff) PCIe: Link timeout on port 1, probably the slot is empty HugeTLB: registered 2.00 MiB page size, pre-allocated 0 pages HugeTLB: 0 KiB vmemmap can be freed for a 2.00 MiB page SCSI subsystem initialized libata version 3.00 loaded. usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb pps_core: LinuxPPS API ver. 1 registered pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti PTP clock support registered EDAC MC: Ver: 3.0.0 PCI host bridge to bus 0000:00 pci_bus 0000:00: root bus resource [mem 0x1000000000000] pci_bus 0000:00: root bus resource [io 0x0000] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00 vgaarb: loaded clocksource: Switched to clocksource OCTEON_CVMCOUNT NET: Registered PF_INET protocol family IP idents hash table entries: 16384 (order: 5, 131072 bytes, linear) tcp_listen_portaddr_hash hash table entries: 512 (order: 1, 8192 bytes, linear) Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear) TCP established hash table entries: 8192 (order: 4, 65536 bytes, linear) TCP bind hash table entries: 8192 (order: 6, 262144 bytes, linear) TCP: Hash tables configured (established 8192 bind 8192) UDP hash table entries: 512 (order: 2, 16384 bytes, linear) UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear) NET: Registered PF_UNIX/PF_LOCAL protocol family RPC: Registered named UNIX socket transport module. RPC: Registered udp transport module. RPC: Registered tcp transport module. RPC: Registered tcp NFSv4.1 backchannel transport module. PCI: CLS 0 bytes, default 128 platform 1180068000000.uctl: clocks initialized. platform 1180069000000.uctl: clocks initialized. Starting KVM with MIPS VZ extensions workingset: timestamp_bits=62 max_order=18 bucket_order=0 NFS: Registering the id_resolver key type Key type id_resolver registered Key type id_legacy registered nfs4filelayout_init: NFSv4 File Layout Driver Registering... nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering... io scheduler mq-deadline registered io scheduler kyber registered io scheduler bfq registered gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation. octeon_gpio 1070000000800.gpio-controller: OCTEON GPIO driver probed. Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled printk: console [ttyS0] disabled 1180000000800.serial: ttyS0 at MMIO 0x1180000000800 (irq = 34, base_baud = 25000000) is a OCTEON printk: console [ttyS0] enabled printk: console [ttyS0] enabled printk: bootconsole [early0] disabled printk: bootconsole [early0] disabled 1180000000c00.serial: ttyS1 at MMIO 0x1180000000c00 (irq = 35, base_baud = 25000000) is a OCTEON loop: module loaded Driver 'pata_octeon_cf' needs updating - please use bus_type methods slram: not enough parameters. spi-octeon 1070000001000.spi: OCTEON SPI bus driver process '/bin/kmod' started with executable stack do_page_fault(): sending SIGSEGV to modprobe for invalid read access from 0000000000000298 epc = 000000fff3346470 in ld.so.1[fff3328000+2e000] ra = 000000fff33456d0 in ld.so.1[fff3328000+2e000] do_page_fault(): sending SIGSEGV to modprobe for invalid read access from 0000000000000298 epc = 000000fff3c78470 in ld.so.1[fff3c5a000+2e000] ra = 000000fff3c776d0 in ld.so.1[fff3c5a000+2e000] do_page_fault(): sending SIGSEGV to modprobe for invalid read access from 0000000000021da8 epc = 000000fff35aa2c0 in ld.so.1[fff358d000+2e000] ra = 000000fff35aa688 in ld.so.1[fff358d000+2e000] do_page_fault(): sending SIGSEGV to modprobe for invalid read access from 0000000000000298 epc = 000000fff34cc470 in ld.so.1[fff34ae000+2e000] ra = 000000fff34cb6d0 in ld.so.1[fff34ae000+2e000] mdio_octeon 1180000001800.mdio: Probed mdio_octeon 1180000001900.mdio: Probed dwc3 1680000000000.xhci: Configuration mismatch. dr_mode forced to host dwc3 1690000000000.xhci: Configuration mismatch. dr_mode forced to host xhci-hcd xhci-hcd.0.auto: xHCI Host Controller xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 1 xhci-hcd xhci-hcd.0.auto: hcc params 0x0220f06d hci version 0x100 quirks 0x0000000002010010 xhci-hcd xhci-hcd.0.auto: irq 25, io mem 0x1680000000000 dwc3 1680000000000.xhci: xhci_plat_probe get usb3phy fail (ret=-6) xhci-hcd xhci-hcd.0.auto: xHCI Host Controller xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2 xhci-hcd xhci-hcd.0.auto: Host supports USB 3.0 SuperSpeed hub 1-0:1.0: USB hub found hub 1-0:1.0: 1 port detected usb usb2: We don't know the algorithms for LPM for this host, disabling LPM. hub 2-0:1.0: USB hub found hub 2-0:1.0: 1 port detected xhci-hcd xhci-hcd.1.auto: xHCI Host Controller xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 3 xhci-hcd xhci-hcd.1.auto: hcc params 0x0220f06d hci version 0x100 quirks 0x0000000002010010 xhci-hcd xhci-hcd.1.auto: irq 26, io mem 0x1690000000000 dwc3 1690000000000.xhci: xhci_plat_probe get usb3phy fail (ret=-6) xhci-hcd xhci-hcd.1.auto: xHCI Host Controller xhci-hcd xhci-hcd.1.auto: new USB bus registered, assigned bus number 4 xhci-hcd xhci-hcd.1.auto: Host supports USB 3.0 SuperSpeed hub 3-0:1.0: USB hub found hub 3-0:1.0: 1 port detected usb usb4: We don't know the algorithms for LPM for this host, disabling LPM. hub 4-0:1.0: USB hub found hub 4-0:1.0: 1 port detected usbcore: registered new interface driver usb-storage i2c-octeon 1180000001000.i2c: probed i2c-octeon 1180000001200.i2c: probed octeon_wdt: Initial granularity 5 Sec EDAC DEVICE0: Giving out device to module octeon-cpu controller cache: DEV octeon_pc_edac (INTERRUPT) EDAC DEVICE1: Giving out device to module octeon-l2c controller octeon_l2c_err: DEV octeon_l2c_edac (POLLED) octeon_lmc_edac octeon_lmc_edac.0: Disabled (ECC not enabled) Interface 0 has 4 ports (SGMII) Interface 1 has 4 ports (SGMII) Interface 3 has 4 ports (LOOP) NET: Registered PF_INET6 protocol family Segment Routing with IPv6 In-situ OAM (IOAM) with IPv6 sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver NET: Registered PF_PACKET protocol family Key type dns_resolver registered OF: fdt: not creating '/sys/firmware/fdt': CRC check failed Freeing unused kernel image (initmem) memory: 27488K This architecture does not have kernel memory protection. Run /init as init process with arguments: /init with environment: HOME=/ TERM=linux do_page_fault(): sending SIGSEGV to init for invalid read access from 0000000000021da8 epc = 000000fff3a542c0 in ld.so.1[fff3a37000+2e000] ra = 000000fff3a54688 in ld.so.1[fff3a37000+2e000] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---