>>> I do not observe the following error if >>> * kernel is compiled with gcc 10, or >>> * kernel version is 5.13.9 or 5.14rc5. >>> The reported UBSAN error is only seen with 5.10 series compiled with >>> CLang 12. Sorry, what I originally reported is partially wrong. I also observe UBSAN with 5.13.11 compiled with CLang 11 as below, which has the same pattern as 5.10: Aug 17 10:22:19 raspi4b-router kernel: IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Aug 17 10:22:19 raspi4b-router systemd[1]: iwd_start_ap@Yamashita_guest.service: Succeeded. Aug 17 10:22:19 raspi4b-router systemd[1]: Finished iwd starting Yamashita_guest access point. Aug 17 10:22:19 raspi4b-router kernel: ================================================================================ Aug 17 10:22:19 raspi4b-router kernel: UBSAN: object-size-mismatch in ./include/linux/skbuff.h:2038:28 Aug 17 10:22:19 raspi4b-router kernel: member access within address 00000000eea757fb with insufficient space Aug 17 10:22:19 raspi4b-router kernel: for an object of type 'struct sk_buff' Aug 17 10:22:19 raspi4b-router kernel: CPU: 0 PID: 7 Comm: kworker/u8:0 Tainted: G C 5.13.11-clang11 #1 Aug 17 10:22:19 raspi4b-router kernel: Hardware name: Raspberry Pi 4 Model B Rev 1.4 (DT) Aug 17 10:22:19 raspi4b-router kernel: Workqueue: brcmf_wq/mmc0:0001:1 brcmf_sdio_dataworker [brcmfmac] Aug 17 10:22:19 raspi4b-router kernel: Call trace: Aug 17 10:22:19 raspi4b-router kernel: dump_backtrace+0x0/0x2a4 Aug 17 10:22:19 raspi4b-router kernel: dump_stack+0xc8/0x150 Aug 17 10:22:19 raspi4b-router kernel: ubsan_type_mismatch_common+0x198/0x2a4 Aug 17 10:22:19 raspi4b-router kernel: __ubsan_handle_type_mismatch_v1+0x40/0x50 Aug 17 10:22:19 raspi4b-router kernel: brcmf_sdio_dpc+0x2078/0x28f0 [brcmfmac] Aug 17 10:22:19 raspi4b-router kernel: brcmf_sdio_dataworker+0x50/0x8c [brcmfmac] Aug 17 10:22:19 raspi4b-router kernel: process_one_work+0x318/0x4fc Aug 17 10:22:19 raspi4b-router kernel: worker_thread+0x2f0/0x660 Aug 17 10:22:19 raspi4b-router kernel: kthread+0x304/0x340 Aug 17 10:22:19 raspi4b-router kernel: ret_from_fork+0x10/0x18 Aug 17 10:22:19 raspi4b-router kernel: ================================================================================ Aug 17 10:22:19 raspi4b-router systemd[1]: Starting Network Service... I attach full journalctl -b on kernel 5.13.11. Best regards, Ryutaroh
Attachment:
journalctl-b-51311-brcmfmac.txt.gz
Description: Binary data
