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| author |   Mikulas Patocka <mpatocka@redhat.com> | 2018-06-14 14:58:21 -0400 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2018-07-04 18:34:23 +0100 |
| commit | 7e7df71fd57ff2894d96abb0080922bf39460a79 (patch) | |
| tree | c3468879fd6c958c3fe53f47a62f7d32cd5bfd93 | |
| parent | ARM64: dump: Convert to use DEFINE_SHOW_ATTRIBUTE macro (diff) | |
| download | linux-dev-7e7df71fd57ff2894d96abb0080922bf39460a79.tar.xz linux-dev-7e7df71fd57ff2894d96abb0080922bf39460a79.zip | |
arm64: fix infinite stacktrace
I've got this infinite stacktrace when debugging another problem:
[ 908.795225] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 908.796176] 1-...!: (1 GPs behind) idle=952/1/4611686018427387904 softirq=1462/1462 fqs=355
[ 908.797692] 2-...!: (1 GPs behind) idle=f42/1/4611686018427387904 softirq=1550/1551 fqs=355
[ 908.799189] (detected by 0, t=2109 jiffies, g=130, c=129, q=235)
[ 908.800284] Task dump for CPU 1:
[ 908.800871] kworker/1:1 R running task 0 32 2 0x00000022
[ 908.802127] Workqueue: writecache-writeabck writecache_writeback [dm_writecache]
[ 908.820285] Call trace:
[ 908.824785] __switch_to+0x68/0x90
[ 908.837661] 0xfffffe00603afd90
[ 908.844119] 0xfffffe00603afd90
[ 908.850091] 0xfffffe00603afd90
[ 908.854285] 0xfffffe00603afd90
[ 908.863538] 0xfffffe00603afd90
[ 908.865523] 0xfffffe00603afd90
The machine just locked up and kept on printing the same line over and
over again. This patch fixes it.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | arch/arm64/kernel/stacktrace.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index d5718a060672..e160ca123da3 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -56,6 +56,9 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame) frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp)); frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 8)); + if (frame->fp <= fp) + return -EINVAL; + #ifdef CONFIG_FUNCTION_GRAPH_TRACER if (tsk->ret_stack && (frame->pc == (unsigned long)return_to_handler)) { |