Message-ID: <CACT4Y+a2itFzrrE63s0E0zEYzWRhg3eRy+zUishW2dqYrywsnw@mail.gmail.com>
Date:   Thu, 17 Dec 2020 11:38:30 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+73d662376f16e2a7336d@...kaller.appspotmail.com>,
        Kees Cook <keescook@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: upstream boot error: UBSAN: null-ptr-deref in corrupted

On Thu, Dec 17, 2020 at 11:14 AM syzbot
<syzbot+73d662376f16e2a7336d@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    accefff5 Merge tag 'arm-soc-omap-genpd-5.11' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14567b7f500000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1e6efc730c219bd4
> dashboard link: https://syzkaller.appspot.com/bug?extid=73d662376f16e2a7336d
> compiler:       clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+73d662376f16e2a7336d@...kaller.appspotmail.com

+Kees

Not sure if it's related to UBSAN or not, but we didn't used to get
empty stack traces.
Either way syzbot can't boot the upstream kernel anymore.

> Linux version 5.10.0-syzkaller (syzkaller@...kaller) (clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b), GNU ld (GNU Binutils for Ubuntu) 2.26.1) #0 SMP PREEMPT now
> Command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0 earlyprintk=serial vsyscall=native oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1
> KERNEL supported cpus:
>   Intel GenuineIntel
>   AMD AuthenticAMD
> x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
> x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
> x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
> x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
> x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
> BIOS-provided physical RAM map:
> BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
> BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
> BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
> BIOS-e820: [mem 0x0000000000100000-0x00000000bfffcfff] usable
> BIOS-e820: [mem 0x00000000bfffd000-0x00000000bfffffff] reserved
> BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] reserved
> BIOS-e820: [mem 0x0000000100000000-0x000000023fffffff] usable
> printk: bootconsole [earlyser0] enabled
> ERROR: earlyprintk= earlyser already used
> ERROR: earlyprintk= earlyser already used
> ERROR: earlyprintk= earlyser already used
> nopcid: PCID feature disabled
> Malformed early option 'vsyscall'
> Malformed early option 'vsyscall'
> NX (Execute Disable) protection: active
> SMBIOS 2.4 present.
> DMI: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Hypervisor detected: KVM
> kvm-clock: Using msrs 4b564d01 and 4b564d00
> kvm-clock: cpu 0, msr dde2001, primary cpu clock
> kvm-clock: using sched offset of 3478136367 cycles
> clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
> tsc: Detected 2300.000 MHz processor
> last_pfn = 0x240000 max_arch_pfn = 0x400000000
> x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT
> last_pfn = 0xbfffd max_arch_pfn = 0x400000000
> found SMP MP-table at [mem 0x000f25a0-0x000f25af]
> Using GB pages for direct mapping
> ACPI: Early table checksum verification disabled
> ACPI: RSDP 0x00000000000F2320 000014 (v00 Google)
> ACPI: RSDT 0x00000000BFFFFFA0 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001)
> ACPI: FACP 0x00000000BFFFF340 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001)
> ================================================================================
> UBSAN: null-ptr-deref in drivers/acpi/acpica/tbfadt.c:459:37
> member access within null pointer of type 'struct acpi_table_fadt'
> CPU: 0 PID: 0 Comm: swapper Not tainted 5.10.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> ================================================================================
> ACPI: DSDT 0x00000000BFFFDA80 0018BA (v01 Google GOOGDSDT 00000001 GOOG 00000001)
> ACPI: FACS 0x00000000BFFFDA40 000040
> ACPI: FACS 0x00000000BFFFDA40 000040
> ACPI: SRAT 0x00000000BFFFFE70 0000C8 (v03 Google GOOGSRAT 00000001 GOOG 00000001)
> ACPI: APIC 0x00000000BFFFFDC0 000076 (v05 Google GOOGAPIC 00000001 GOOG 00000001)
> ACPI: SSDT 0x00000000BFFFF440 000980 (v01 Google GOOGSSDT 00000001 GOOG 00000001)
> ACPI: WAET 0x00000000BFFFFE40 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001)
> SRAT: PXM 0 -> APIC 0x00 -> Node 0
> SRAT: PXM 0 -> APIC 0x01 -> Node 0
> ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0009ffff]
> ACPI: SRAT: Node 0 PXM 0 [mem 0x00100000-0xbfffffff]
> ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x23fffffff]
> NUMA: Node 0 [mem 0x00000000-0x0009ffff] + [mem 0x00100000-0xbfffffff] -> [mem 0x00000000-0xbfffffff]
> NUMA: Node 0 [mem 0x00000000-0xbfffffff] + [mem 0x100000000-0x23fffffff] -> [mem 0x00000000-0x23fffffff]
> Faking node 0 at [mem 0x0000000000000000-0x000000013fffffff] (5120MB)
> Faking node 1 at [mem 0x0000000140000000-0x000000023fffffff] (4096MB)
> NODE_DATA(0) allocated [mem 0x13fffb000-0x13fffffff]
> NODE_DATA(1) allocated [mem 0x23fff8000-0x23fffcfff]
> Zone ranges:
>   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
>   DMA32    [mem 0x0000000001000000-0x00000000ffffffff]
>   Normal   [mem 0x0000000100000000-0x000000023fffffff]
>   Device   empty
> Movable zone start for each node
> Early memory node ranges
>   node   0: [mem 0x0000000000001000-0x000000000009efff]
>   node   0: [mem 0x0000000000100000-0x00000000bfffcfff]
>   node   0: [mem 0x0000000100000000-0x000000013fffffff]
>   node   1: [mem 0x0000000140000000-0x000000023fffffff]
> Zeroed struct page in unavailable ranges: 101 pages
> Initmem setup node 0 [mem 0x0000000000001000-0x000000013fffffff]
> Initmem setup node 1 [mem 0x0000000140000000-0x000000023fffffff]
> kasan: KernelAddressSanitizer initialized
> ACPI: PM-Timer IO Port: 0xb008
> ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
> IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
> ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
> ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
> ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
> ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
> Using ACPI (MADT) for SMP configuration information
> smpboot: Allowing 2 CPUs, 0 hotplug CPUs
> PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff]
> PM: hibernation: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
> PM: hibernation: Registered nosave memory: [mem 0x000a0000-0x000effff]
> PM: hibernation: Registered nosave memory: [mem 0x000f0000-0x000fffff]
> PM: hibernation: Registered nosave memory: [mem 0xbfffd000-0xbfffffff]
> PM: hibernation: Registered nosave memory: [mem 0xc0000000-0xfffbbfff]
> PM: hibernation: Registered nosave memory: [mem 0xfffbc000-0xffffffff]
> [mem 0xc0000000-0xfffbbfff] available for PCI devices
> Booting paravirtualized kernel on KVM
> clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
> setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:2 nr_node_ids:2
> percpu: Embedded 63 pages/cpu s221000 r8192 d28856 u1048576
> kvm-guest: stealtime: cpu 0, msr b9e1fb00
> kvm-guest: PV spinlocks enabled
> PV qspinlock hash table entries: 256 (order: 0, 4096 bytes, linear)
> Built 2 zonelists, mobility grouping on.  Total pages: 2064261
> Policy zone: Normal
> Kernel command line: earlyprintk=serial oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1 ima_policy=tcb watchdog_thresh=55 workqueue.watchdog_thresh=140 kvm-intel.nested=1 nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 vivid.n_devs=16 vivid.multiplanar=1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2 netrom.nr_ndevs=16 rose.rose_ndevs=16 spec_store_bypass_disable=prctl numa=fake=2 nopcid dummy_hcd.num=8 binder.debug_mask=0 rcupdate.rcu_expedited=1 root=/dev/sda console=ttyS0 vsyscall=native BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0 earlyprintk=serial vsyscall=native oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1
> mem auto-init: stack:off, heap alloc:on, heap free:off
> Memory: 6874060K/8388204K available (124958K kernel code, 24337K rwdata, 32104K rodata, 3276K init, 26932K bss, 1513888K reserved, 0K cma-reserved)
> SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=2
> Running RCU self tests
> rcu: Preemptible hierarchical RCU implementation.
> rcu:    RCU lockdep checking is enabled.
> rcu:    RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
> rcu:    RCU callback double-/use-after-free debug enabled.
> rcu:    RCU debug extended QS entry/exit.
>         All grace periods are expedited (rcu_expedited).
>         Trampoline variant of Tasks RCU enabled.
>         Tracing variant of Tasks RCU enabled.
> rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
> rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
> NR_IRQS: 4352, nr_irqs: 440, preallocated irqs: 16
> random: crng done (trusting CPU's manufacturer)
> Console: colour VGA+ 80x25
> printk: console [ttyS0] enabled
> printk: console [ttyS0] enabled
> printk: bootconsole [earlyser0] disabled
> printk: bootconsole [earlyser0] disabled
> Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> ... MAX_LOCKDEP_SUBCLASSES:  8
> ... MAX_LOCK_DEPTH:          48
> ... MAX_LOCKDEP_KEYS:        8192
> ... CLASSHASH_SIZE:          4096
> ... MAX_LOCKDEP_ENTRIES:     32768
> ... MAX_LOCKDEP_CHAINS:      65536
> ... CHAINHASH_SIZE:          32768
>  memory used by lock dependency info: 6365 kB
>  memory used for stack traces: 4224 kB
>  per task-struct memory footprint: 1920 bytes
> mempolicy: Enabling automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl
> ACPI: Core revision 20201113
> APIC: Switch to symmetric I/O mode setup
> ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
> clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x212735223b2, max_idle_ns: 440795277976 ns
> Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000)
> pid_max: default: 32768 minimum: 301
> LSM: Security Framework initializing
> Yama: becoming mindful.
> TOMOYO Linux initialized
> Smack:  Initializing.
> Smack:  Netfilter enabled.
> Smack:  IPv6 Netfilter enabled.
> LSM support for eBPF active
> Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, vmalloc)
> Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, vmalloc)
> Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, vmalloc)
> Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, vmalloc)
> Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024
> Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4
> Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
> Spectre V2 : Spectre mitigation: kernel not compiled with retpoline; no mitigation available!
> Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl
> MDS: Mitigation: Clear CPU buffers
> Freeing SMP alternatives memory: 88K
> kvm-clock: cpu 1, msr dde2041, secondary cpu clock
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
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