================================================================== BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq read-write to 0xffff888103522380 of 8 bytes by interrupt on cpu 0: rtc_handle_legacy_irq drivers/rtc/interface.c:624 [inline] rtc_pie_update_irq+0x93/0xf0 drivers/rtc/interface.c:672 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20c/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 copy_mc_enhanced_fast_string+0x6/0xf arch/x86/lib/copy_mc_64.S:128 copy_mc_to_kernel+0x50/0xc0 arch/x86/lib/copy_mc.c:75 copy_mc_user_highpage include/linux/highmem.h:349 [inline] __wp_page_copy_user mm/memory.c:3260 [inline] wp_page_copy mm/memory.c:3576 [inline] do_wp_page+0xa59/0x2400 mm/memory.c:4030 handle_pte_fault mm/memory.c:6105 [inline] __handle_mm_fault mm/memory.c:6232 [inline] handle_mm_fault+0x77d/0x2be0 mm/memory.c:6401 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 read to 0xffff888103522380 of 8 bytes by task 9421 on cpu 1: rtc_dev_poll+0x78/0xb0 drivers/rtc/dev.c:198 vfs_poll include/linux/poll.h:82 [inline] io_poll_check_events io_uring/poll.c:262 [inline] io_poll_task_func+0x142/0x9e0 io_uring/poll.c:319 io_handle_tw_list+0xcc/0x1c0 io_uring/io_uring.c:1062 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1127 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1145 task_work_run+0x12e/0x1a0 kernel/task_work.c:227 get_signal+0xe13/0xf70 kernel/signal.c:2807 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x7a/0x100 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000000000000c1c0 -> 0x000000000000c2c0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 9421 Comm: syz.1.2123 Not tainted 6.15.0-syzkaller-13473-gc0c9379f235d #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== ================================================================== BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq read-write to 0xffff888103522380 of 8 bytes by interrupt on cpu 0: rtc_handle_legacy_irq drivers/rtc/interface.c:624 [inline] rtc_pie_update_irq+0x93/0xf0 drivers/rtc/interface.c:672 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20c/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:81 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:743 default_idle_call+0x3d/0x70 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0xcb/0x240 kernel/sched/idle.c:325 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:423 rest_init+0xee/0xf0 init/main.c:744 start_kernel+0x592/0x600 init/main.c:1101 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0xfc/0x100 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x147 read to 0xffff888103522380 of 8 bytes by task 9421 on cpu 1: rtc_dev_poll+0x78/0xb0 drivers/rtc/dev.c:198 vfs_poll include/linux/poll.h:82 [inline] __io_arm_poll_handler+0x1ee/0xb70 io_uring/poll.c:583 io_poll_add+0x69/0xe0 io_uring/poll.c:893 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1730 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1753 io_queue_sqe io_uring/io_uring.c:1960 [inline] io_req_task_submit+0x6b/0xc0 io_uring/io_uring.c:1375 io_poll_task_func+0x674/0x9e0 io_uring/poll.c:-1 io_handle_tw_list+0xcc/0x1c0 io_uring/io_uring.c:1062 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1127 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1145 task_work_run+0x12e/0x1a0 kernel/task_work.c:227 get_signal+0xe13/0xf70 kernel/signal.c:2807 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x7a/0x100 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000102bc0 -> 0x0000000000102cc0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 9421 Comm: syz.1.2123 Not tainted 6.15.0-syzkaller-13473-gc0c9379f235d #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== ================================================================== BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq read-write to 0xffff888103522380 of 8 bytes by interrupt on cpu 0: rtc_handle_legacy_irq drivers/rtc/interface.c:624 [inline] rtc_pie_update_irq+0x93/0xf0 drivers/rtc/interface.c:672 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20c/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:81 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:743 default_idle_call+0x3d/0x70 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0xcb/0x240 kernel/sched/idle.c:325 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:423 rest_init+0xee/0xf0 init/main.c:744 start_kernel+0x592/0x600 init/main.c:1101 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0xfc/0x100 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x147 read to 0xffff888103522380 of 8 bytes by task 9421 on cpu 1: rtc_dev_poll+0x78/0xb0 drivers/rtc/dev.c:198 vfs_poll include/linux/poll.h:82 [inline] __io_arm_poll_handler+0x1ee/0xb70 io_uring/poll.c:583 io_poll_add+0x69/0xe0 io_uring/poll.c:893 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1730 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1753 io_queue_sqe io_uring/io_uring.c:1960 [inline] io_req_task_submit+0x6b/0xc0 io_uring/io_uring.c:1375 io_poll_task_func+0x674/0x9e0 io_uring/poll.c:-1 io_handle_tw_list+0xcc/0x1c0 io_uring/io_uring.c:1062 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1127 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1145 task_work_run+0x12e/0x1a0 kernel/task_work.c:227 get_signal+0xe13/0xf70 kernel/signal.c:2807 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x7a/0x100 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000001d5fc0 -> 0x00000000001d60c0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 9421 Comm: syz.1.2123 Not tainted 6.15.0-syzkaller-13473-gc0c9379f235d #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================