Xianting Tian 150573c60c RISC-V: Fixup schedule out issue in machine_crash_shutdown() ... commit ad943893d5 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-08-17 14:22:52 +02:00
..
probes	riscv:uprobe fix SR_SPIE set/clear handling	2022-08-17 14:22:52 +02:00
vdso	riscv/vdso: Move vdso data page up front	2021-10-02 13:42:25 -07:00
.gitignore	…
Makefile	riscv: fix oops caused by irqsoff latency tracer	2022-03-02 11:48:08 +01:00
asm-offsets.c	…
cacheinfo.c	drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION()	2021-09-01 10:29:10 +02:00
cpu-hotplug.c	riscv: cpu-hotplug: clear cpu from numa map when teardown	2022-02-16 12:56:18 +01:00
cpu.c	…
cpu_ops.c	…
cpu_ops_sbi.c	…
cpu_ops_spinwait.c	…
cpufeature.c	…
crash_dump.c	…
crash_save_regs.S	RISC-V: Fixup get incorrect user mode PC for kernel mode regs	2022-08-17 14:22:52 +02:00
efi-header.S	…
efi.c	riscv: read-only pages should not be writable	2022-06-14 18:36:11 +02:00
entry.S	riscv: fix oops caused by irqsoff latency tracer	2022-03-02 11:48:08 +01:00
fpu.S	…
ftrace.c	…
head.S	riscv: Initialize thread pointer before calling C functions	2022-06-09 10:22:26 +02:00
head.h	…
image-vars.h	…
irq.c	…
jump_label.c	…
kexec_relocate.S	riscv: Don't use va_pa_offset on kdump	2022-01-27 11:02:50 +01:00
kgdb.c	…
machine_kexec.c	RISC-V: Fixup schedule out issue in machine_crash_shutdown()	2022-08-17 14:22:52 +02:00
mcount-dyn.S	…
mcount.S	…
module-sections.c	…
module.c	riscv: Fix auipc+jalr relocation range checks	2022-03-16 14:23:43 +01:00
patch.c	riscv: patch_text: Fixup last cpu should be master	2022-05-09 09:14:31 +02:00
perf_callchain.c	uaccess: fix type mismatch warnings from access_ok()	2022-04-08 14:24:01 +02:00
perf_event.c	…
perf_regs.c	…
process.c	…
ptrace.c	…
reset.c	riscv: set default pm_power_off to NULL	2022-08-17 14:22:49 +02:00
riscv_ksyms.c	…
sbi.c	…
setup.c	RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem instead of IORESOURCE_BUSY	2022-06-09 10:22:26 +02:00
signal.c	…
smp.c	RISC-V: Use common riscv_cpuid_to_hartid_mask() for both SMP=y and SMP=n	2022-01-27 11:02:50 +01:00
smpboot.c	…
soc.c	…
stacktrace.c	riscv: eliminate unreliable __builtin_frame_address(1)	2022-02-16 12:56:18 +01:00
sys_riscv.c	…
syscall_table.c	riscv/vdso: Refactor asm/vdso.h	2021-10-02 13:42:23 -07:00
time.c	…
trace_irq.c	riscv: fix oops caused by irqsoff latency tracer	2022-03-02 11:48:08 +01:00
trace_irq.h	riscv: fix oops caused by irqsoff latency tracer	2022-03-02 11:48:08 +01:00
traps.c	trap: cleanup trap_init()	2021-09-08 11:50:27 -07:00
traps_misaligned.c	…
vdso.c	riscv/vdso: make arch_setup_additional_pages wait for mmap_sem for write killable	2021-10-02 13:42:26 -07:00
vmlinux-xip.lds.S	riscv: Move EXCEPTION_TABLE to RO_DATA segment	2021-09-10 23:59:48 -07:00
vmlinux.lds.S	riscv: Move EXCEPTION_TABLE to RO_DATA segment	2021-09-10 23:59:48 -07:00