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SubjectRe: "rcu: React to callback overload by aggressively seeking quiescent states" hangs on boot
On Fri, Dec 13, 2019 at 01:13:27AM -0500, Qian Cai wrote:
> The linux-next commit 82150cb53dcb ("rcu: React to callback overload by aggressively seeking quiescent states”)
> causes hangs on boot on almost all arches. Reverted it fixed the issue.

I am running this on a number of x86 systems, but will try it on a
wider variety. If I cannot reproduce it, would you be willing to
run diagnostics?

Just to double-check... Are you running rcutorture built into the kernel?
(My guess is "no", but figured that I should ask.)

Thanx, Paul

> === x86_64 (Intel) ===
>
> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config
>
> [ 29.130611][ T0] mce: CPU0: Thermal monitoring enabled (TM1)
> [ 29.136598][ T0] process: using mwait in idle threads
> [ 29.140582][ T0] Last level iTLB entries: 4KB 64, 2MB 8, 4MB 8
> [ 29.146704][ T0] Last level dTLB entries: 4KB 64, 2MB 0, 4MB 0, 1GB 4
> [ 29.150570][ T0] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
> [ 29.160584][ T0] Spectre V2 : Mitigation: Full generic retpoline
> [ 29.166881][ T0] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
> [ 29.170567][ T0] Spectre V2 : Enabling Restricted Speculation for firmware calls
> [ 29.180569][ T0] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier
> [ 29.190567][ T0] Spectre V2 : User space: Mitigation: STIBP via seccomp and prctl
> [ 29.200569][ T0] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl and seccomp
> [ 29.210570][ T0] TAA: Vulnerable: Clear CPU buffers attempted, no microcode
> [ 28.995181][ T0] MDS: Vulnerable: Clear CPU buffers attempted, no microcode
> [ 29.005929][ T0] debug: unmapping init [mem 0xffffffffb50ec000-0xffffffffb50f0fff]
> [ 29.035681][ T1] smpboot: CPU0: Intel(R) Xeon(R)
> <hang ….>
>
> === arm64 ===
>
> https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config
>
> [ 0.000000][ T0] ITS [mem 0x440100000-0x44011ffff]
> [ 0.000000][ T0] ITS@0x0000000440100000: allocated 65536 Devices @8bfd080000 (flat, esz 8, psz 64K, shr 0)
> [ 0.000000][ T0] ITS@0x0000000440100000: allocated 32768 Interrupt Collections @8bfd020000 (flat, esz 2, psz 16K, shr 0)
> [ 0.000000][ T0] ITS: using cache flushing for cmd queue
> [ 0.000000][ T0] GICv3: using LPI property table @0x0000000880db0000
> [ 0.000000][ T0] GIC: using cache flushing for LPI property table
> [ 0.000000][ T0] GICv3: CPU0: using allocated LPI pending table @0x0000000880dd0000
> [ 0.000000][ T0] arch_timer: cp15 timer(s) running at 200.00MHz (phys).
> [ 0.000000][ T0] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x2e2049d3e8, max_idle_ns: 440795210634 ns
> [ 0.000005][ T0] sched_clock: 56 bits at 200MHz, resolution 5ns, wraps every 4398046511102ns
> [ 0.061872][ T0] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> [ 0.070420][ T0] ... MAX_LOCKDEP_SUBCLASSES: 8
> [ 0.075298][ T0] ... MAX_LOCK_DEPTH: 48
> [ 0.080240][ T0] ... MAX_LOCKDEP_KEYS: 8192
> [ 0.085379][ T0] ... CLASSHASH_SIZE: 4096
> [ 0.090496][ T0] ... MAX_LOCKDEP_ENTRIES: 32768
> [ 0.095722][ T0] ... MAX_LOCKDEP_CHAINS: 65536
> [ 0.100926][ T0] ... CHAINHASH_SIZE: 32768
> [ 0.106153][ T0] memory used by lock dependency info: 6237 kB
> [ 0.112324][ T0] memory used for stack traces: 4224 kB
> [ 0.117902][ T0] per task-struct memory footprint: 1920 bytes
> [ 0.158652][ T0] ACPI: Core revision 20191018
> [ 0.194716][ T0] Calibrating delay loop (skipped), value calculated using timer frequency.. 400.00 BogoMIPS (lpj=2000000)
> [ 0.206116][ T0] pid_max: default: 262144 minimum: 2048
> [ 0.355206][ T0] Dentry cache hash table entries: 8388608 (order: 10, 67108864 bytes, vmalloc)
> [ 0.396920][ T0] Inode-cache hash table entries: 4194304 (order: 9, 33554432 bytes, vmalloc)
> [ 0.422261][ T0] Mount-cache hash table entries: 131072 (order: 4, 1048576 bytes, vmalloc)
> [ 0.431925][ T0] Mountpoint-cache hash table entries: 131072 (order: 4, 1048576 bytes, vmalloc)
> [ 0.736297][ T1] ASID allocator initialised with 32768 entries
> [ 0.743932][ T1] rcu: Hierarchical SRCU implementation.
> [ 0.759898][ T1] Platform MSI: ITS@0x400100000 domain created
> [ 0.766249][ T1] Platform MSI: ITS@0x440100000 domain created
> [ 0.772602][ T1] PCI/MSI: ITS@0x400100000 domain created
> [ 0.778561][ T1] PCI/MSI: ITS@0x440100000 domain created
> [ 0.784292][ T1] Remapping and enabling EFI services.
> <hang …>
>
> === powerpc ===
>
> https://raw.githubusercontent.com/cailca/linux-mm/master/powerpc.config
>
> [ 0.000000][ T0] SLUB: HWalign=128, Order=0-0, MinObjects=0, CPUs=128, Nodes=256
> [ 0.000000][ T0] ODEBUG: selftest passed
> [ 0.000000][ T0] ftrace: allocating 19886 entries in 8 pages
> [ 0.000000][ T0] ftrace: allocated 8 pages with 1 groups
> [ 0.000000][ T0] Running RCU self tests
> [ 0.000000][ T0] rcu: Hierarchical RCU implementation.
> [ 0.000000][ T0] rcu: RCU lockdep checking is enabled.
> [ 0.000000][ T0] rcu: RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=128.
> [ 0.000000][ T0] rcu: RCU callback double-/use-after-free debug enabled.
> [ 0.000000][ T0] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
> [ 0.000000][ T0] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=128
> [ 0.000000][ T0] NR_IRQS: 512, nr_irqs: 512, preallocated irqs: 16
> [ 0.000000][ T0] xive: Interrupt handling initialized with native backend
> [ 0.000000][ T0] xive: Using priority 7 for all interrupts
> [ 0.000000][ T0] xive: Using 64kB queues
> [ 0.000007][ T0] time_init: 56 bit decrementer (max: 7fffffffffffff)
> [ 0.003188][ T0] clocksource: timebase: mask: 0xffffffffffffffff max_cycles: 0x761537d007, max_idle_ns: 440795202126 ns
> [ 0.011496][ T0] clocksource: timebase mult[1f40000] shift[24] registered
> [ 0.029470][ T0] printk: console [hvc0] enabled
> [ 0.029470][ T0] printk: console [hvc0] enabled
> [ 0.035652][ T0] printk: bootconsole [udbg0] disabled
> [ 0.035652][ T0] printk: bootconsole [udbg0] disabled
> [ 0.040864][ T0] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> [ 0.040892][ T0] ... MAX_LOCKDEP_SUBCLASSES: 8
> [ 0.040918][ T0] ... MAX_LOCK_DEPTH: 48
> [ 0.040944][ T0] ... MAX_LOCKDEP_KEYS: 8192
> [ 0.040969][ T0] ... CLASSHASH_SIZE:
> <hang ...>

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