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From 488896b1ab0ca8bc4cc6aa608b6ee1744ae480e7 Mon Sep 17 00:00:00 2001
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From: Tao Liu <ltao@redhat.com>
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Date: Mon, 19 Sep 2022 17:49:21 +0800
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Subject: [PATCH 23/28] Fix "kmem" failing to print task context when address
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is vmalloced stack
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When kernel enabled CONFIG_VMAP_STACK, stack can be allocated to
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vmalloced area. Currently crash didn't handle the case, as a result,
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"kmem" will not print the task context as expected. This patch fix the
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bug by checking if the address is a vmalloced stack first.
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Before:
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crash> kmem ffffb7efce9bbe28
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VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE
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ffff94eb9102c640 ffff94eb9102b140 ffffb7efce9b8000 - ffffb7efce9bd000 20480
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffdd28220dc000 1883700000 0 0 1 50000000000000
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After:
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crash> kmem ffffb7efce9bbe28
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PID: 847
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COMMAND: "khungtaskd"
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TASK: ffff94f8038f4000 [THREAD_INFO: ffff94f8038f4000]
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CPU: 72
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STATE: TASK_RUNNING (PANIC)
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VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE
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ffff94eb9102c640 ffff94eb9102b140 ffffb7efce9b8000 - ffffb7efce9bd000 20480
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffdd28220dc000 1883700000 0 0 1 50000000000000
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Signed-off-by: Tao Liu <ltao@redhat.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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memory.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/memory.c b/memory.c
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index a31a430e2823..e44b59d2e805 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -13477,6 +13477,10 @@ kmem_search(struct meminfo *mi)
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* Check for a valid mapped address.
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*/
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if ((mi->memtype == KVADDR) && IS_VMALLOC_ADDR(mi->spec_addr)) {
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+ if ((task = stkptr_to_task(vaddr)) && (tc = task_to_context(task))) {
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+ show_context(tc);
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+ fprintf(fp, "\n");
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+ }
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if (kvtop(NULL, mi->spec_addr, &paddr, 0)) {
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mi->flags = orig_flags | VMLIST_VERIFY;
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dump_vmlist(mi);
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--
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2.37.1
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