From 2c24770e3ceab8eebd9788256967b79145f53123 Mon Sep 17 00:00:00 2001 From: Tao Liu Date: Mon, 19 Sep 2022 17:49:23 +0800 Subject: [PATCH 41/89] Let "kmem" print task context with physical address Patch [1] enables "kmem" to print task context if the given virtual address is a vmalloced stack. This patch lets "kmem" print task context also when the given address is a physical address. Before: crash> kmem 1883700e28 VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE ffff94eb9102c640 ffff94eb9102b140 ffffb7efce9b8000 - ffffb7efce9bd000 20480 PAGE PHYSICAL MAPPING INDEX CNT FLAGS ffffdd28220dc000 1883700000 0 0 1 50000000000000 After: crash> kmem 1883700e28 PID: 847 COMMAND: "khungtaskd" TASK: ffff94f8038f4000 [THREAD_INFO: ffff94f8038f4000] CPU: 72 STATE: TASK_RUNNING (PANIC) VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE ffff94eb9102c640 ffff94eb9102b140 ffffb7efce9b8000 - ffffb7efce9bd000 20480 PAGE PHYSICAL MAPPING INDEX CNT FLAGS ffffdd28220dc000 1883700000 0 0 1 50000000000000 [1]: https://listman.redhat.com/archives/crash-utility/2022-September/010115.html [ kh: squashed the 4/4 patch into 3/4 ] Signed-off-by: Tao Liu Signed-off-by: Kazuhito Hagio Signed-off-by: Lianbo Jiang --- memory.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/memory.c b/memory.c index 1b6f9ba17e57..c80ef61bdcf7 100644 --- a/memory.c +++ b/memory.c @@ -13506,6 +13506,10 @@ kmem_search(struct meminfo *mi) mi->flags &= ~GET_PHYS_TO_VMALLOC; if (mi->retval) { + if ((task = stkptr_to_task(mi->retval)) && (tc = task_to_context(task))) { + show_context(tc); + fprintf(fp, "\n"); + } if ((sp = value_search(mi->retval, &offset))) { show_symbol(sp, offset, SHOW_LINENUM | SHOW_RADIX()); @@ -13562,11 +13566,11 @@ kmem_search(struct meminfo *mi) /* * Check whether it's a current task or stack address. */ - if ((mi->memtype == KVADDR) && (task = vaddr_in_task_struct(vaddr)) && + if ((mi->memtype & (KVADDR|PHYSADDR)) && (task = vaddr_in_task_struct(vaddr)) && (tc = task_to_context(task))) { show_context(tc); fprintf(fp, "\n"); - } else if ((mi->memtype == KVADDR) && (task = stkptr_to_task(vaddr)) && + } else if ((mi->memtype & (KVADDR|PHYSADDR)) && (task = stkptr_to_task(vaddr)) && (tc = task_to_context(task))) { show_context(tc); fprintf(fp, "\n"); -- 2.37.1