你好，我又出现一个问题，就是用insmod加载.KO模块后，无法用rmmod卸载模块，提示如下，如何解决这个问题？root@tgq-desktop:/mnt# insmod pca9555.ko [ 664.237567] -----pca9555_probe----- [ 664.237834] Unable to handle kernel NULL pointer dereference at virtual address 00000088 [ 664.237984] Mem abort info: [ 664.238055] ESR = 0x96000005 [ 664.238131] Exception class = DABT (current EL), IL = 32 bits [ 664.238252] SET = 0, FnV = 0 [ 664.238305] EA = 0, S1PTW = 0 [ 664.238360] Data abort info: [ 664.238505] ISV = 0, ISS = 0x00000005 [ 664.238574] CM = 0, WnR = 0 [ 664.238636] user pgtable: 4k pages, 39-bit VAs, pgd = ffffffc18ca88000 [ 664.238741] [0000000000000088] *pgd=0000000000000000, *pud=0000000000000000 [ 664.238902] Internal error: Oops: 96000005 [#1] PREEMPT SMP [ 664.238997] Modules linked in: pca9555(+) bnep zram xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink xt_addrtype iptable_filter iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack br_netfilter overlay fuse userspace_alert nvgpu ip_tables x_tables [ 664.240308] CPU: 1 PID: 22035 Comm: insmod Not tainted 4.9.253-tegra #7 [ 664.240804] Hardware name: NVIDIA Jetson Xavier NX Developer Kit (DT) [ 664.246860] task: ffffffc18161aa00 task.stack: ffffffc1f4e28000 [ 664.252897] PC is at pca9555_probe+0x28/0x148 [pca9555] [ 664.258145] LR is at pca9555_probe+0x28/0x148 [pca9555] [ 664.263136] pc : [<ffffff8000f891c8>] lr : [<ffffff8000f891c8>] pstate: 40400045 [ 664.270652] sp : ffffffc1f4e2ba80 [ 664.273897] x29: ffffffc1f4e2ba80 x28: 0000000000000018 [ 664.278977] x27: 000000000000005f x26: 0000000000000030 [ 664.284742] x25: 0000000000000000 x24: ffffff8008f8b970 [ 664.290517] x23: ffffff8000f891a0 x22: ffffffc1f4cd4804 [ 664.295593] x21: ffffffc1f4cd4800 x20: 0000000000000000 [ 664.300929] x19: 0000000000000000 x18: 0000000000000010 [ 664.306529] x17: 0000007fa21863e0 x16: 0000000000035103 [ 664.311963] x15: ffffffffffffffff x14: ffffff808a15e5b7 [ 664.317922] x13: ffffff800a15e5c5 x12: 0000000000000000 [ 664.323677] x11: 0000000005f5e0ff x10: 0000000000000464 [ 664.329198] x9 : 00000000ffffffd0 x8 : ffffff80083d7080 [ 664.335225] x7 : ffffff8009ec44a8 x6 : ffffffc1ffd1cbf0 [ 664.340739] x5 : ffffffc1ffd1cbf0 x4 : 0000000000000000 [ 664.346075] x3 : ffffffc1ffd227f8 x2 : ffffffc1ffd1cbf0 [ 664.351414] x1 : ffffffc18161aa00 x0 : 0000000000000018 [ 664.356498] [ 664.358159] Process insmod (pid: 22035, stack limit = 0xffffffc1f4e28000) [ 664.364281] Call trace: [ 664.366651] [<ffffff8000f891c8>] pca9555_probe+0x28/0x148 [pca9555] [ 664.372771] [<ffffff8008ae63cc>] i2c_device_probe+0x144/0x258 [ 664.378111] [<ffffff8008781248>] driver_probe_device+0x298/0x448 [ 664.383706] [<ffffff80087814d4>] __driver_attach+0xdc/0x128 [ 664.389041] [<ffffff800877eb04>] bus_for_each_dev+0x5c/0xa8 [ 664.394380] [<ffffff8008780888>] driver_attach+0x30/0x40 [ 664.399196] [<ffffff80087802bc>] bus_add_driver+0x20c/0x2a8 [ 664.404794] [<ffffff800878240c>] driver_register+0x6c/0x110 [ 664.410130] [<ffffff8008ae6abc>] i2c_register_driver+0x4c/0xb0 [ 664.415731] [<ffffff8000f89308>] pca9555_driver_init+0x20/0x50 [pca9555] [ 664.422031] [<ffffff8008083b3c>] do_one_initcall+0x44/0x130 [ 664.427550] [<ffffff8008f609dc>] do_init_module+0x64/0x1b0 [ 664.433146] [<ffffff80081569dc>] load_module+0x10ac/0x12e0 [ 664.438654] [<ffffff8008156ec0>] SyS_finit_module+0xd8/0xf0 [ 664.444172] [<ffffff8008083900>] el0_svc_naked+0x34/0x38 [ 664.449686] ---[ end trace eda99276cac5a0cc ]--- Segmentation fault root@tgq-desktop:/mnt# rmmod pca9555.ko rmmod: ERROR: Module pca9555 is in use