49 lines
1.6 KiB
Diff
49 lines
1.6 KiB
Diff
From 88a4910d95d43a01151ad1d570035b96893bc7f1 Mon Sep 17 00:00:00 2001
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From: Lianbo Jiang <lijiang@redhat.com>
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Date: Wed, 21 Dec 2022 17:09:08 +0800
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Subject: [PATCH 07/28] Fix "mount" command to appropriately display the mount
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dumps
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Recently the following failure has been observed on some vmcores when
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using the mount command:
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crash> mount
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MOUNT SUPERBLK TYPE DEVNAME DIRNAME
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ffff97a4818a3480 ffff979500013800 rootfs none /
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ffff97e4846ca700 ffff97e484653000 sysfs sysfs /sys
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...
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ffff97b484753420 0 mount: invalid kernel virtual address: 0 type: "super_block buffer"
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The kernel virtual address of the super_block is zero when the mount
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command fails with the vfsmnt address 0xffff97b484753420. And the
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remaining mount information will be discarded. That is not expected.
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Check the address and skip it with a warning, if this is an invalid
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kernel virtual address, that can avoid truncating the remaining mount
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dumps.
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Reported-by: Dave Wysochanski <dwysocha@redhat.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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filesys.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/filesys.c b/filesys.c
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index c2ea78de821d..d64b54a9b822 100644
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--- a/filesys.c
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+++ b/filesys.c
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@@ -1491,6 +1491,10 @@ show_mounts(ulong one_vfsmount, int flags, struct task_context *namespace_contex
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}
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sbp = ULONG(vfsmount_buf + OFFSET(vfsmount_mnt_sb));
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+ if (!IS_KVADDR(sbp)) {
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+ error(WARNING, "cannot get super_block from vfsmnt: 0x%lx\n", *vfsmnt);
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+ continue;
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+ }
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if (flags)
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fprintf(fp, "%s", mount_hdr);
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--
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2.37.1
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