================================================================== BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq read-write to 0xffff888102364388 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+0x20f/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 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x3c/0x60 kernel/locking/spinlock.c:194 __unix_dgram_recvmsg+0x3a7/0x810 net/unix/af_unix.c:2626 unix_dgram_recvmsg+0x81/0x90 net/unix/af_unix.c:2700 sock_recvmsg_nosec+0x107/0x130 net/socket.c:1065 ____sys_recvmsg+0x26f/0x280 net/socket.c:2832 ___sys_recvmsg+0x11f/0x370 net/socket.c:2876 do_recvmmsg+0x1ef/0x540 net/socket.c:2971 __sys_recvmmsg net/socket.c:3045 [inline] __do_sys_recvmmsg net/socket.c:3068 [inline] __se_sys_recvmmsg net/socket.c:3061 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3061 x64_sys_call+0x27a6/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888102364388 of 8 bytes by task 15189 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:581 io_poll_add+0x69/0xe0 io_uring/poll.c:901 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1773 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1796 io_queue_sqe io_uring/io_uring.c:2025 [inline] io_req_task_submit+0x6b/0xd0 io_uring/io_uring.c:1415 io_poll_task_func+0x645/0x910 io_uring/poll.c:-1 io_handle_tw_list+0xcc/0x1c0 io_uring/io_uring.c:1102 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1167 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1185 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:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000001009c0 -> 0x0000000000100ac0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15189 Comm: syz.3.4206 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 ================================================================== ================================================================== BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq read-write to 0xffff888102364388 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+0x20f/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:757 default_idle_call+0x3d/0x70 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0xcb/0x240 kernel/sched/idle.c:330 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:428 rest_init+0xee/0xf0 init/main.c:744 start_kernel+0x4d7/0x510 init/main.c:1097 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 0xffff888102364388 of 8 bytes by task 15189 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+0x143/0x910 io_uring/poll.c:317 io_handle_tw_list+0xcc/0x1c0 io_uring/io_uring.c:1102 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1167 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1185 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:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000000000070a9c0 -> 0x000000000070aac0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15189 Comm: syz.3.4206 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 ================================================================== ================================================================== BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq read-write to 0xffff888102364388 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+0x20f/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:757 default_idle_call+0x3d/0x70 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0xcb/0x240 kernel/sched/idle.c:330 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:428 rest_init+0xee/0xf0 init/main.c:744 start_kernel+0x4d7/0x510 init/main.c:1097 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 0xffff888102364388 of 8 bytes by task 15189 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:581 io_poll_add+0x69/0xe0 io_uring/poll.c:901 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1773 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1796 io_queue_sqe io_uring/io_uring.c:2025 [inline] io_req_task_submit+0x6b/0xd0 io_uring/io_uring.c:1415 io_poll_task_func+0x645/0x910 io_uring/poll.c:-1 io_handle_tw_list+0xcc/0x1c0 io_uring/io_uring.c:1102 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1167 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1185 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:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000d07fc0 -> 0x0000000000d080c0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15189 Comm: syz.3.4206 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 ================================================================== ================================================================== BUG: KCSAN: data-race in rtc_dev_poll / rtc_pie_update_irq read-write to 0xffff888102364388 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+0x20f/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:757 default_idle_call+0x3d/0x70 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0xcb/0x240 kernel/sched/idle.c:330 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:428 rest_init+0xee/0xf0 init/main.c:744 start_kernel+0x4d7/0x510 init/main.c:1097 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 0xffff888102364388 of 8 bytes by task 15189 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+0x143/0x910 io_uring/poll.c:317 io_handle_tw_list+0xcc/0x1c0 io_uring/io_uring.c:1102 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1167 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1185 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:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000013077c0 -> 0x00000000013078c0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15189 Comm: syz.3.4206 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 ==================================================================