In case siw module can't be inserted successfully, then if remove the module from kernel, then both siw_cm_exit and the failure path in siw_init_module call siw_destroy_cpulist. Let's set tx_valid_cpus and num_nodes to prevent double free issues. [ 32.197293] general protection fault, probably for non-canonical address 0xb4965e5a58a488: 0000 [#1] PREEMPT SMP NOPTI [ 32.197300] CPU: 0 PID: 1676 Comm: modprobe Tainted: G OE 6.5.0-rc3+ #16 [ 32.197304] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.0-0-gd239552c-rebuilt.opensuse.org 04/01/2014 [ 32.197306] RIP: 0010:kfree+0x62/0x150 ... [ 32.197339] Call Trace: [ 32.197341] <TASK> [ 32.197343] ? show_regs+0x72/0x90 [ 32.197348] ? die_addr+0x38/0xb0 [ 32.197351] ? exc_general_protection+0x1bf/0x4a0 [ 32.197357] ? asm_exc_general_protection+0x27/0x30 [ 32.197362] ? kfree+0x62/0x150 [ 32.197366] siw_exit_module+0xb8/0x590 [siw] [ 32.197376] __do_sys_delete_module.constprop.0+0x18f/0x300 So let's set tx_valid_cpus and num_nodes to prevent the issue. Signed-off-by: Guoqing Jiang <guoqing.jiang@xxxxxxxxx> --- drivers/infiniband/sw/siw/siw_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c index 65b5cda5457b..b3547253c099 100644 --- a/drivers/infiniband/sw/siw/siw_main.c +++ b/drivers/infiniband/sw/siw/siw_main.c @@ -178,6 +178,8 @@ static void siw_destroy_cpulist(void) kfree(siw_cpu_info.tx_valid_cpus[i++]); kfree(siw_cpu_info.tx_valid_cpus); + siw_cpu_info.tx_valid_cpus = NULL; + siw_cpu_info.num_nodes = 0; } /* -- 2.34.1
