From: Yasunori Goto y-goto@jp.fujitsu.com
The root cause of panic is the num_pm of nfit_test1 is wrong. Though 1 is specified for num_pm at nfit_test_init(), it must be 2, because nfit_test1->spa_set[] array has 2 elements.
Since the array is smaller than expected, the driver breaks other area. (it is often the link list of devres).
As a result, panic occurs like the following example.
CPU: 4 PID: 2233 Comm: lt-libndctl Tainted: G O 4.12.0-rc1+ #12 RIP: 0010:__list_del_entry_valid+0x6c/0xa0 Call Trace: release_nodes+0x76/0x260 devres_release_all+0x3c/0x50 device_release_driver_internal+0x159/0x200 device_release_driver+0x12/0x20 bus_remove_device+0xfd/0x170 device_del+0x1e8/0x330 platform_device_del+0x28/0x90 platform_device_unregister+0x12/0x30 nfit_test_exit+0x2a/0x93b [nfit_test]
Cc: stable@vger.kernel.org Signed-off-by: Yasunori Goto y-goto@jp.fujitsu.com Signed-off-by: Dan Williams dan.j.williams@intel.com --- tools/testing/nvdimm/test/nfit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c index 47ab1ab..ffdb7d0 100644 --- a/tools/testing/nvdimm/test/nfit.c +++ b/tools/testing/nvdimm/test/nfit.c @@ -2388,7 +2388,7 @@ static __init int nfit_test_init(void) nfit_test->setup = nfit_test0_setup; break; case 1: - nfit_test->num_pm = 1; + nfit_test->num_pm = 2; nfit_test->dcr_idx = NUM_DCR; nfit_test->num_dcr = 2; nfit_test->alloc = nfit_test1_alloc;