================================================================== BUG: KCSAN: data-race in do_syslog / log_store write to 0xffffffff89513200 of 8 bytes by interrupt on cpu 0: log_store+0x7a2/0x7d0 kernel/printk/printk.c:672 log_output kernel/printk/printk.c:1932 [inline] vprintk_store+0x5ba/0x700 kernel/printk/printk.c:1983 vprintk_emit+0x114/0x4f0 kernel/printk/printk.c:2011 dev_vprintk_emit+0x337/0x36f drivers/base/core.c:4129 dev_printk_emit+0x6a/0x8c drivers/base/core.c:4140 __dev_printk+0xfa/0x103 drivers/base/core.c:4152 dev_printk+0x73/0x96 drivers/base/core.c:4169 scsi_print_command+0x4dc/0x560 drivers/scsi/scsi_logging.c:221 scsi_io_completion_action drivers/scsi/scsi_lib.c:793 [inline] scsi_io_completion+0xd1b/0xf40 drivers/scsi/scsi_lib.c:957 scsi_finish_command+0x277/0x2c0 drivers/scsi/scsi.c:214 scsi_softirq_done+0x271/0x400 drivers/scsi/scsi_lib.c:1464 blk_done_softirq+0x1a5/0x200 block/blk-mq.c:586 __do_softirq+0x198/0x360 kernel/softirq.c:298 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:652 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffffffff89513200 of 8 bytes by task 8283 on cpu 1: do_syslog+0x3b2/0x1480 kernel/printk/printk.c:1561 kmsg_read+0x7a/0xa0 fs/proc/kmsg.c:40 pde_read fs/proc/inode.c:306 [inline] proc_reg_read+0xde/0x1a0 fs/proc/inode.c:316 vfs_read+0x16d/0x5e0 fs/read_write.c:479 ksys_read+0xce/0x180 fs/read_write.c:607 __do_sys_read fs/read_write.c:617 [inline] __se_sys_read fs/read_write.c:615 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:615 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8283 Comm: in:imklog Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================