rtl8188eu kernel panic with preempt_rt kernel 5.10

[erichyc7035]

Hi,

Is anyone tried to run the driver within Kernel 5.10 with preempt_rt patched? I met kernel panic as below: [ 79.141208] R8188EU: assoc success [ 79.151525] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 79.216300] R8188EU: sta recv deauth reason code(7) sta:00:fe:c8:28:12:f0 [ 79.225988] Unable to handle kernel paging request at virtual address ffff80001256e054 [ 79.233906] Mem abort info: [ 79.236728] printk: console [ttyS2]: printing thread stopped [ 79.243058] ESR = 0x96000021 [ 79.246158] EC = 0x25: DABT (current EL), IL = 32 bits [ 79.251476] SET = 0, FnV = 0 [ 79.254523] EA = 0, S1PTW = 0 [ 79.257664] Data abort info: [ 79.260544] ISV = 0, ISS = 0x00000021 [ 79.264378] CM = 0, WnR = 0 [ 79.267346] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000082e93000 [ 79.274044] [ffff80001256e054] pgd=00000008fffff003, p4d=00000008fffff003, pud=00000008ffffe003, pmd=0000000881758003, pte=0068000886b1c703 [ 79.286567] Internal error: Oops: 96000021 [#1] PREEMPT_RT SMP [ 79.292390] Modules linked in: r8188eu(C) lib80211 cfg80211 bluetooth ecdh_generic ecc rfkill xhci_plat_hcd xhci_hcd usbcore rpmsg_char ti_am335x_adc kfifo_buf dwc3 udc_core roles usb_common omap_rng rng_core irq_pruss_intc crct10dif_ce icssg_prueth pru_rproc icss_iep phy_can_transceiver ti_k3_r5_remoteproc virtio_rpmsg_bus m_can_platform m_can can_dev ti_am335x_tscadc ti_cal videobuf2_dma_contig v4l2_fwnode videobuf2_memops videobuf2_v4l2 videobuf2_common pruss sa2ul sha512_generic authenc phy_omap_usb2 dwc3_keystone sch_fq_codel ipv6 [ 79.339883] CPU: 0 PID: 1314 Comm: RTW_CMD_THREAD Tainted: G C O 5.10.100-rt62-g204ec708dc #24 [ 79.349609] Hardware name: Texas Instruments AM654 Base Board (DT) [ 79.355777] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--) [ 79.361774] pc : rt_spin_unlock+0xa8/0x130 [ 79.365877] lr : rtw_free_xmitframe_queue+0x38/0x90 [r8188eu] [ 79.371720] sp : ffff80001308bc40 [ 79.375024] x29: ffff80001308bc40 x28: ffff800008daf308 [ 79.380330] x27: ffff800011a77000 x26: ffff800011a770a0 [ 79.385634] x25: ffff800008dc2000 x24: ffff800011a77008 [ 79.390939] x23: ffff80001256dd6c x22: ffff80001256e03c [ 79.396243] x21: ffff800011a785e8 x20: ffff80001256e02c [ 79.401547] x19: ffff800011a785e8 x18: 0000000000000010 [ 79.406852] x17: 0000000000000001 x16: 0000000000000019 [ 79.412156] x15: 000005bc3a0feed8 x14: 0000000000000227 [ 79.417460] x13: 0000000000000227 x12: 0000000000000000 [ 79.422764] x11: 0000000000001852 x10: 0000000000000a50 [ 79.428068] x9 : ffff80001308b950 x8 : ffff00087f784ec0 [ 79.433372] x7 : ffff000000000000 x6 : 00000000000015e8 [ 79.438676] x5 : ffff80001256e054 x4 : 0000000000000800 [ 79.443981] x3 : ffff80001256e03c x2 : ffff000803aec9c0 [ 79.449285] x1 : 0000000000000000 x0 : ffff80001256e03c [ 79.454590] Call trace: [ 79.457029] rt_spin_unlock+0xa8/0x130 [ 79.460773] rtw_free_xmitframe_queue+0x38/0x90 [r8188eu] [ 79.466244] rtw_free_stainfo+0x58/0x3f0 [r8188eu] [ 79.471106] rtw_free_assoc_resources_locked+0x7c/0x228 [r8188eu] [ 79.477267] rtw_free_assoc_resources+0x38/0x60 [r8188eu] [ 79.482736] rtw_stadel_event_callback+0x188/0x3a0 [r8188eu] [ 79.488465] mlme_evt_hdl+0x5c/0x128 [r8188eu] [ 79.492980] rtw_cmd_thread+0x1e4/0x310 [r8188eu] [ 79.497755] kthread+0x174/0x198 [ 79.500982] ret_from_fork+0x10/0x34 [ 79.504562] Code: c8047ca2 35ffff84 17ffff30 f98000b1 (c85ffca0) [ 79.510648] ---[ end trace 0000000000000002 ]--- [ 79.515437] Kernel panic - not syncing: [ 79.519261] Oops: Fatal exception in interrupt [ 79.519381] SMP: stopping secondary CPUs [ 79.527752] Kernel Offset: disabled [ 79.531230] CPU features: 0x0040002,2000200c [ 79.535490] Memory Limit: none [ 79.538538] ---[ end Kernel panic - not syncing: Oops: Fatal exception in interrupt ]---

I'm not sure if it's related to kernel 5.10 or due to preempt_rt patch. Please someone help to check.

Thanks.

[lwfinger]

You are using driver r8188eu. That means it comes from the kernel, not this repo. You need to report this problem at linux-wireless@vger.org. If you blacklist r8188eu, install the driver from this repo, and still get the error, then I can look at it.

[erichyc7035]

Hi Iwfinger,

Thanks for your response. I will report this to the one you mentioned to see if it can be solved.

Thanks.

[Muil1024]

Hi Iwfinger,

Thanks for your response. I will report this to the one you mentioned to see if it can be solved.

Thanks.

Hi erichyc7035

I have the same problem with you. Have you found a solution and can you share it?

Thanks.

[erichyc7035]

@Muil1024

No, I didn't find a solution for this.

Eric