LKFT started testing KCSAN enabled kernel from the linux next tree. Here we have found BUG: KCSAN: data-race in mutex_spin_on_owner and several more KCSAN BUGs.

This report is from an x86_64 machine clang-11 linux next 20201201. Since we are running for the first time we do not call this regression.

[ 4.745161] usbcore: registered new interface driver cdc_ether [ 4.751281] ================================================================== [ 4.756653] usbcore: registered new interface driver net1080 [ 4.752139] BUG: KCSAN: data-race in mutex_spin_on_owner+0xef/0x1b0 [ 4.752139] [ 4.752139] race at unknown origin, with read to 0xffff90a80098b034 of 4 bytes by task 252 on cpu 1: [ 4.769781] usbcore: registered new interface driver cdc_subset [ 4.752139] mutex_spin_on_owner+0xef/0x1b0 [ 4.752139] __mutex_lock+0x69d/0x820 [ 4.752139] __mutex_lock_slowpath+0x13/0x20 [ 4.781657] usbcore: registered new interface driver zaurus [ 4.752139] mutex_lock+0x9d/0xb0 [ 4.752139] ata_eh_acquire+0x2e/0x80 [ 4.752139] ata_msleep+0x91/0xa0 [ 4.792317] usbcore: registered new interface driver cdc_ncm [ 4.752139] sata_link_debounce+0x1ad/0x2f0 [ 4.752139] sata_link_resume+0x32f/0x4a0 [ 4.752139] sata_link_hardreset+0x456/0x640 [ 4.802369] usbcore: registered new interface driver r8153_ecm [ 4.752139] ahci_do_hardreset+0x177/0x230 [ 4.752139] ahci_hardreset+0x23/0x40 [ 4.752139] ata_eh_reset+0x91e/0x1bb0 [ 4.810641] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 4.810482] ata_eh_recover+0x79b/0x2bd0 [ 4.810482] sata_pmp_error_handler+0x7d1/0x1340 [ 4.810482] ahci_error_handler+0x7c/0xc0 [ 4.819247] ehci-pci: EHCI PCI platform driver [ 4.810482] ata_scsi_port_error_handler+0x708/0xd30 [ 4.810482] ata_scsi_error+0x128/0x160 [ 4.826321] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 4.810482] scsi_error_handler+0x26d/0x700 [ 4.810482] kthread+0x20b/0x220 [ 4.836069] ohci-pci: OHCI PCI platform driver [ 4.810482] ret_from_fork+0x22/0x30 [ 4.810482] [ 4.844397] uhci_hcd: USB Universal Host Controller Interface driver [ 4.810482] Reported by Kernel Concurrency Sanitizer on: [ 4.810482] CPU: 1 PID: 252 Comm: scsi_eh_1 Not tainted 5.10.0-rc6-next-20201201 #2 [ 4.810482] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS 2.2 05/23/2018 [ 4.855343] xhci_hcd 0000:00:14.0: xHCI Host Controller [ 4.810482] ==================================================================

metadata: git_repo: https://gitlab.com/aroxell/lkft-linux-next target_arch: x86 toolchain: clang-11 git_describe: next-20201201 kernel_version: 5.10.0-rc6 download_url: https://builds.tuxbuild.com/1l8eiWgGMi6W4aDobjAAlOleFVl/

full test log link, https://lkft.validation.linaro.org/scheduler/job/2002643#L831