================================================================== BUG: KCSAN: data-race in fprop_new_period / fprop_reflect_period_percpu read-write to 0xffffffff86e8e418 of 4 bytes by interrupt on cpu 1: fprop_new_period+0xf7/0x170 lib/flex_proportions.c:83 writeout_period+0x55/0xe0 mm/page-writeback.c:610 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1421 expire_timers+0x116/0x240 kernel/time/timer.c:1466 __run_timers+0x320/0x3d0 kernel/time/timer.c:1734 run_timer_softirq+0x56/0x60 kernel/time/timer.c:1749 __do_softirq+0x158/0x2e3 kernel/softirq.c:558 __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0x41/0x70 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 kcsan_setup_watchpoint+0x3e9/0x3f0 kernel/kcsan/core.c:694 filemap_release_folio+0x1a/0xd0 mm/filemap.c:3981 try_to_release_page+0x42/0xf0 mm/folio-compat.c:152 shrink_page_list+0x15eb/0x3d40 mm/vmscan.c:1855 shrink_inactive_list+0x433/0x740 mm/vmscan.c:2360 shrink_list mm/vmscan.c:2590 [inline] shrink_lruvec+0x3b9/0x700 mm/vmscan.c:2909 shrink_node_memcgs+0x23e/0x400 mm/vmscan.c:3098 shrink_node+0x8c3/0x1110 mm/vmscan.c:3221 shrink_zones+0x2c1/0x5d0 mm/vmscan.c:3458 do_try_to_free_pages+0x165/0x720 mm/vmscan.c:3516 try_to_free_mem_cgroup_pages+0x1cd/0x420 mm/vmscan.c:3830 try_charge_memcg+0x270/0x960 mm/memcontrol.c:2604 obj_cgroup_charge_pages mm/memcontrol.c:2951 [inline] __memcg_kmem_charge_page+0x2e4/0x480 mm/memcontrol.c:2977 __alloc_pages+0x1a5/0x320 mm/page_alloc.c:5425 alloc_pages+0x34d/0x450 vm_area_alloc_pages mm/vmalloc.c:2942 [inline] __vmalloc_area_node mm/vmalloc.c:3001 [inline] __vmalloc_node_range+0x740/0xec0 mm/vmalloc.c:3172 __bpf_map_area_alloc kernel/bpf/syscall.c:330 [inline] bpf_map_area_alloc+0xbc/0xd0 kernel/bpf/syscall.c:337 bloom_map_alloc+0x229/0x370 kernel/bpf/bloom_filter.c:144 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create+0x38a/0x6e0 kernel/bpf/syscall.c:864 __sys_bpf+0x269/0x600 kernel/bpf/syscall.c:4645 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline] __se_sys_bpf kernel/bpf/syscall.c:4765 [inline] __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4765 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffffffff86e8e418 of 4 bytes by task 1834 on cpu 0: fprop_reflect_period_percpu+0x22/0x1a0 lib/flex_proportions.c:192 __fprop_add_percpu lib/flex_proportions.c:223 [inline] __fprop_add_percpu_max+0x54/0x180 lib/flex_proportions.c:281 wb_domain_writeout_add mm/page-writeback.c:557 [inline] __wb_writeout_add+0x7e/0x1d0 mm/page-writeback.c:581 __folio_end_writeback+0x2f4/0x540 mm/page-writeback.c:2809 folio_end_writeback+0x57/0x130 mm/filemap.c:1652 end_page_writeback+0x3b/0xe0 mm/folio-compat.c:26 ext4_finish_bio+0x30e/0x3f0 fs/ext4/page-io.c:143 ext4_release_io_end+0x5f/0x140 fs/ext4/page-io.c:158 ext4_end_io_end fs/ext4/page-io.c:192 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:257 [inline] ext4_end_io_rsv_work+0x206/0x280 fs/ext4/page-io.c:271 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 value changed: 0x00000299 -> 0x0000029a Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1834 Comm: kworker/u4:3 Tainted: G W 5.18.0-rc2-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work ==================================================================