================================================================== BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: tick_sched_do_timer+0x33/0xe0 kernel/time/tick-sched.c:128 tick_sched_timer+0x43/0xe0 kernel/time/tick-sched.c:1289 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 find_watchpoint kernel/kcsan/core.c:84 [inline] __kcsan_check_watchpoint+0xb3/0x180 kernel/kcsan/core.c:322 __tsan_write8+0x18/0x40 kernel/kcsan/kcsan.c:31 ipt_do_table+0x16b/0xe40 net/ipv4/netfilter/ip_tables.c:256 iptable_filter_hook+0x4a/0x60 net/ipv4/netfilter/iptable_filter.c:37 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x83/0x160 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:260 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] ip_local_deliver+0x1e5/0x210 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0x121/0x160 net/ipv4/ip_input.c:413 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_rcv+0x18f/0x1a0 net/ipv4/ip_input.c:523 write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: tick_sched_do_timer+0xc0/0xe0 kernel/time/tick-sched.c:132 tick_sched_timer+0x43/0xe0 kernel/time/tick-sched.c:1289 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 is_atomic kernel/kcsan/core.c:164 [inline] should_watch kernel/kcsan/core.c:194 [inline] __kcsan_setup_watchpoint+0x2d/0x510 kernel/kcsan/core.c:363 __tsan_write8 kernel/kcsan/kcsan.c:31 [inline] __tsan_write8+0x32/0x40 kernel/kcsan/kcsan.c:31 iov_iter_init+0xb7/0x120 lib/iov_iter.c:451 new_sync_read+0x365/0x4f0 fs/read_write.c:412 __vfs_read+0xb1/0xc0 fs/read_write.c:427 vfs_read fs/read_write.c:461 [inline] vfs_read+0x143/0x2c0 fs/read_write.c:446 ksys_read+0xd5/0x1b0 fs/read_write.c:587 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7264 Comm: syz-fuzzer Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================