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| author |   Dan Williams <dan.j.williams@intel.com> | 2019-07-17 18:07:58 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-07-18 16:21:34 -0700 |
| commit | 8aac0e2338916e273ccbd438a2b7a1e8c61749f5 (patch) | |
| tree | 5e0f6c25790695f3ba5b7f758edf649574597702 /drivers/nvdimm/region.c | |
| parent | drivers/base: Introduce kill_device() (diff) | |
| download | linux-dev-8aac0e2338916e273ccbd438a2b7a1e8c61749f5.tar.xz linux-dev-8aac0e2338916e273ccbd438a2b7a1e8c61749f5.zip | |
libnvdimm/bus: Prevent duplicate device_unregister() calls
A multithreaded namespace creation/destruction stress test currently
fails with signatures like the following:
sysfs group 'power' not found for kobject 'dax1.1'
RIP: 0010:sysfs_remove_group+0x76/0x80
Call Trace:
device_del+0x73/0x370
device_unregister+0x16/0x50
nd_async_device_unregister+0x1e/0x30 [libnvdimm]
async_run_entry_fn+0x39/0x160
process_one_work+0x23c/0x5e0
worker_thread+0x3c/0x390
BUG: kernel NULL pointer dereference, address: 0000000000000020
RIP: 0010:klist_put+0x1b/0x6c
Call Trace:
klist_del+0xe/0x10
device_del+0x8a/0x2c9
? __switch_to_asm+0x34/0x70
? __switch_to_asm+0x40/0x70
device_unregister+0x44/0x4f
nd_async_device_unregister+0x22/0x2d [libnvdimm]
async_run_entry_fn+0x47/0x15a
process_one_work+0x1a2/0x2eb
worker_thread+0x1b8/0x26e
Use the kill_device() helper to atomically resolve the race of multiple
threads issuing kill, device_unregister(), requests.
Reported-by: Jane Chu <jane.chu@oracle.com>
Reported-by: Erwin Tsaur <erwin.tsaur@oracle.com>
Fixes: 4d88a97aa9e8 ("libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver...")
Cc: <stable@vger.kernel.org>
Link: https://github.com/pmem/ndctl/issues/96
Tested-by: Tested-by: Jane Chu <jane.chu@oracle.com>
Link: https://lore.kernel.org/r/156341207846.292348.10435719262819764054.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/region.c')
0 files changed, 0 insertions, 0 deletions