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| author | Arun Easi <arun.easi@cavium.com> | 2017-05-19 11:33:15 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-05-24 05:16:42 +0300 |
| commit | 5e901d0b15c0cba8c5ba55e4be46fc5a0e2f3cb9 (patch) | |
| tree | 74f6e7c51b8c8631367243ea78c8fe566b763761 /drivers/scsi/qedi/qedi.h | |
| parent | 0648a07c9b22acc33ead0645cf8f607b0c9c7e32 (diff) | |
| download | linux-5e901d0b15c0cba8c5ba55e4be46fc5a0e2f3cb9.tar.xz | |
scsi: qedi: Fix bad pte call trace when iscsiuio is stopped.
munmap done by iscsiuio during a stop of the service triggers a "bad
pte" warning sometimes. munmap kernel path goes through the mmapped
pages and has a validation check for mapcount (in struct page) to be
zero or above. kzalloc, which we had used to allocate udev->ctrl, uses
slab allocations, which re-uses mapcount (union) for other purposes that
can make the mapcount look negative. Avoid all these trouble by invoking
one of the __get_free_pages wrappers to be used instead of kzalloc for
udev->ctrl.
BUG: Bad page map in process iscsiuio pte:80000000aa624067 pmd:3e6777067
page:ffffea0002a98900 count:2 mapcount:-2143289280
mapping: (null) index:0xffff8800aa624e00
page flags: 0x10075d00000090(dirty|slab)
page dumped because: bad pte
addr:00007fcba70a3000 vm_flags:0c0400fb anon_vma: (null)
mapping:ffff8803edf66e90 index:0
Call Trace:
dump_stack+0x19/0x1b
print_bad_pte+0x1af/0x250
unmap_page_range+0x7a7/0x8a0
unmap_single_vma+0x81/0xf0
unmap_vmas+0x49/0x90
unmap_region+0xbe/0x140
? vma_rb_erase+0x121/0x220
do_munmap+0x245/0x420
vm_munmap+0x41/0x60
SyS_munmap+0x22/0x30
tracesys+0xdd/0xe2
Signed-off-by: Arun Easi <arun.easi@cavium.com>
Signed-off-by: Manish Rangankar <manish.rangankar@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/qedi/qedi.h')
0 files changed, 0 insertions, 0 deletions