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ad943893d5
linux/arch/riscv/kernel
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Xianting Tian ad943893d5
RISC-V: Fixup schedule out issue in machine_crash_shutdown() 
Current task of executing crash kexec will be schedule out when panic is
triggered by RCU Stall, as it needs to wait rcu completion. It lead to
inability to enter the crash system.

The implementation of machine_crash_shutdown() is non-standard for RISC-V
according to other Arch's implementation(eg, x86, arm64), we need to send
IPI to stop secondary harts.

[224521.877268] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[224521.883471] rcu: 	0-...0: (3 GPs behind) idle=cfa/0/0x1 softirq=3968793/3968793 fqs=2495
[224521.891742] 	(detected by 2, t=5255 jiffies, g=60855593, q=328)
[224521.897754] Task dump for CPU 0:
[224521.901074] task:swapper/0     state:R  running task   stack:  0 pid:  0 ppid:   0 flags:0x00000008
[224521.911090] Call Trace:
[224521.913638] [<ffffffe000c432de>] __schedule+0x208/0x5ea
[224521.918957] Kernel panic - not syncing: RCU Stall
[224521.923773] bad: scheduling from the idle thread!
[224521.928571] CPU: 2 PID: 0 Comm: swapper/2 Kdump: loaded Tainted: G   O  5.10.113-yocto-standard #1
[224521.938658] Call Trace:
[224521.941200] [<ffffffe00020395c>] walk_stackframe+0x0/0xaa
[224521.946689] [<ffffffe000c34f8e>] show_stack+0x32/0x3e
[224521.951830] [<ffffffe000c39020>] dump_stack_lvl+0x7e/0xa2
[224521.957317] [<ffffffe000c39058>] dump_stack+0x14/0x1c
[224521.962459] [<ffffffe000243884>] dequeue_task_idle+0x2c/0x40
[224521.968207] [<ffffffe000c434f4>] __schedule+0x41e/0x5ea
[224521.973520] [<ffffffe000c43826>] schedule+0x34/0xe4
[224521.978487] [<ffffffe000c46cae>] schedule_timeout+0xc6/0x170
[224521.984234] [<ffffffe000c4491e>] wait_for_completion+0x98/0xf2
[224521.990157] [<ffffffe00026d9e2>] __wait_rcu_gp+0x148/0x14a
[224521.995733] [<ffffffe0002761c4>] synchronize_rcu+0x5c/0x66
[224522.001307] [<ffffffe00026f1a6>] rcu_sync_enter+0x54/0xe6
[224522.006795] [<ffffffe00025a436>] percpu_down_write+0x32/0x11c
[224522.012629] [<ffffffe000c4266a>] _cpu_down+0x92/0x21a
[224522.017771] [<ffffffe000219a0a>] smp_shutdown_nonboot_cpus+0x90/0x118
[224522.024299] [<ffffffe00020701e>] machine_crash_shutdown+0x30/0x4a
[224522.030483] [<ffffffe00029a3f8>] __crash_kexec+0x62/0xa6
[224522.035884] [<ffffffe000c3515e>] panic+0xfa/0x2b6
[224522.040678] [<ffffffe0002772be>] rcu_sched_clock_irq+0xc26/0xcb8
[224522.046774] [<ffffffe00027fc7a>] update_process_times+0x62/0x8a
[224522.052785] [<ffffffe00028d522>] tick_sched_timer+0x9e/0x102
[224522.058533] [<ffffffe000280c3a>] __hrtimer_run_queues+0x16a/0x318
[224522.064716] [<ffffffe0002812ec>] hrtimer_interrupt+0xd4/0x228
[224522.070551] [<ffffffe0009a69b6>] riscv_timer_interrupt+0x3c/0x48
[224522.076646] [<ffffffe000268f8c>] handle_percpu_devid_irq+0xb0/0x24c
[224522.083004] [<ffffffe00026428e>] __handle_domain_irq+0xa8/0x122
[224522.089014] [<ffffffe00062f954>] riscv_intc_irq+0x38/0x60
[224522.094501] [<ffffffe000201bd4>] ret_from_exception+0x0/0xc
[224522.100161] [<ffffffe000c42146>] rcu_eqs_enter.constprop.0+0x8c/0xb8

With the patch, it can enter crash system when RCU Stall occur.

Fixes: e53d28180d ("RISC-V: Add kdump support")
Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220811074150.3020189-4-xianting.tian@linux.alibaba.com
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-08-11 08:54:46 -07:00
..
compat_vdso riscv: compat: vdso: Add COMPAT_VDSO base code implementation 2022-04-26 13:36:53 -07:00
probes ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
vdso riscv: compat: vdso: Add COMPAT_VDSO base code implementation 2022-04-26 13:36:53 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
alternative.c riscv: add memory-type errata for T-Head 2022-05-11 21:36:33 -07:00
asm-offsets.c RISC-V: Add arch functions for non-retentive suspend entry/exit 2022-03-10 09:29:31 -08:00
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
compat_signal.c riscv: compat: signal: Add rt_frame implementation 2022-05-17 16:37:21 -07:00
compat_syscall_table.c riscv: compat: syscall: Add compat_sys_call_table implementation 2022-04-26 13:36:25 -07:00
cpu_ops_sbi.c RISC-V: Declare per cpu boot data as static 2022-03-31 12:44:32 -07:00
cpu_ops_spinwait.c RISC-V: Use __cpu_up_stack/task_pointer only for spinwait method 2022-01-20 09:27:08 -08:00
cpu_ops.c RISC-V: Move spinwait booting method to its own config 2022-01-20 09:27:16 -08:00
cpu-hotplug.c riscv: cpu-hotplug: clear cpu from numa map when teardown 2022-02-10 09:16:50 -08:00
cpu.c riscv: Don't output a bogus mmu-type on a no MMU kernel 2022-05-21 12:20:04 -07:00
cpufeature.c Bitmap patches for 5.19-rc1 2022-06-04 14:04:27 -07:00
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
crash_save_regs.S RISC-V: Fixup get incorrect user mode PC for kernel mode regs 2022-08-11 08:54:40 -07:00
efi-header.S RISC-V: Add PE/COFF header for EFI stub 2020-10-02 14:31:16 -07:00
efi.c riscv: read-only pages should not be writable 2022-05-28 11:39:31 +02:00
elf_kexec.c RISC-V: Load purgatory in kexec_file 2022-05-19 12:19:03 -07:00
entry.S riscv: compat: syscall: Add entry.S implementation 2022-04-26 13:36:31 -07:00
fpu.S riscv: abstract out CSR names for supervisor vs machine mode 2019-11-05 09:20:42 -08:00
ftrace.c ftrace: Remove return value of ftrace_arch_modify_*() 2022-05-26 21:13:00 -04:00
head.h RISC-V: Move spinwait booting method to its own config 2022-01-20 09:27:16 -08:00
head.S riscv: Initialize thread pointer before calling C functions 2022-06-01 21:46:23 -07:00
image-vars.h arch/riscv:fix typo in a comment in arch/riscv/kernel/image-vars.h 2021-02-18 23:18:00 -08:00
irq.c RISC-V: Remove do_IRQ() function 2020-06-09 19:11:24 -07:00
jump_label.c riscv: Add jump-label implementation 2020-07-30 11:37:43 -07:00
kexec_relocate.S riscv: Don't use va_pa_offset on kdump 2022-01-09 10:38:06 -08:00
kgdb.c riscv: Fix "no previous prototype" compile warning in kgdb.c file 2020-07-09 20:09:30 -07:00
machine_kexec_file.c RISC-V: Add kexec_file support 2022-05-19 12:14:18 -07:00
machine_kexec.c RISC-V: Fixup schedule out issue in machine_crash_shutdown() 2022-08-11 08:54:46 -07:00
Makefile riscv: kexec: add kexec_file_load() support 2022-05-19 16:26:50 -07:00
mcount-dyn.S riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT 2021-01-14 15:09:05 -08:00
mcount.S riscv: Workaround mcount name prior to clang-13 2021-04-26 08:25:01 -07:00
module-sections.c riscv: add missing header file includes 2019-10-28 00:46:01 -07:00
module.c riscv: implement module alternatives 2022-05-11 21:36:31 -07:00
patch.c riscv: patch_text: Fixup last cpu should be master 2022-04-22 08:29:24 -07:00
perf_callchain.c riscv: Fix fill_callchain return value 2022-03-30 23:01:42 -07:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c This set of changes updates init and user mode helper tasks to be 2022-06-03 16:03:05 -07:00
ptrace.c riscv: compat: ptrace: Add compat_arch_ptrace implement 2022-05-17 16:37:22 -07:00
reset.c riscv: Use do_kernel_power_off() 2022-05-19 19:30:30 +02:00
riscv_ksyms.c riscv: provide memmove implementation 2020-12-10 17:27:54 -08:00
sbi.c RISC-V: Fix IPI/RFENCE hmask on non-monotonic hartid ordering 2022-02-14 12:27:45 -08:00
setup.c RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem instead of IORESOURCE_BUSY 2022-06-01 22:03:50 -07:00
signal.c riscv: compat: signal: Add rt_frame implementation 2022-05-17 16:37:21 -07:00
smp.c RISC-V: Use common riscv_cpuid_to_hartid_mask() for both SMP=y and SMP=n 2022-01-09 12:13:31 -08:00
smpboot.c riscv: move boot alternatives to after fill_hwcap 2022-05-11 21:36:32 -07:00
soc.c riscv: Fix builtin DTB handling 2021-01-07 19:00:50 -08:00
stacktrace.c riscv: Rename "sp_in_global" to "current_stack_pointer" 2022-03-30 15:15:27 -07:00
suspend_entry.S RISC-V: Split out the XIP fixups into their own file 2022-05-25 14:43:33 -07:00
suspend.c RISC-V: Add arch functions for non-retentive suspend entry/exit 2022-03-10 09:29:31 -08:00
sys_riscv.c riscv: compat: syscall: Add compat_sys_call_table implementation 2022-04-26 13:36:25 -07:00
syscall_table.c riscv/vdso: Refactor asm/vdso.h 2021-10-02 13:42:23 -07:00
time.c RISC-V Patches for the 5.13 Merge Window, Part 1 2021-05-06 09:24:18 -07:00
trace_irq.c riscv: fix oops caused by irqsoff latency tracer 2022-02-24 20:30:30 -08:00
trace_irq.h riscv: fix oops caused by irqsoff latency tracer 2022-02-24 20:30:30 -08:00
traps_misaligned.c riscv: Unaligned load/store handling for M_MODE 2020-04-03 10:45:33 -07:00
traps.c riscv: integrate alternatives better into the main architecture 2022-05-11 21:36:31 -07:00
vdso.c riscv: compat: Using seperated vdso_maps for compat_vdso_info 2022-05-25 17:24:06 -07:00
vmlinux-xip.lds.S riscv: vmlinux.lds.S|vmlinux-xip.lds.S: remove .fixup section 2022-01-05 17:53:37 -08:00
vmlinux.lds.S riscv: vmlinux.lds.S|vmlinux-xip.lds.S: remove .fixup section 2022-01-05 17:53:37 -08:00