================================================================== BUG: KCSAN: data-race in __cgroup_account_cputime / cgroup_rstat_flush_locked write to 0xffffe8ffffd6edd8 of 8 bytes by task 6854 on cpu 1: __cgroup_account_cputime+0x67/0xc0 kernel/cgroup/rstat.c:371 cgroup_account_cputime include/linux/cgroup.h:797 [inline] update_curr+0xf6/0x280 kernel/sched/fair.c:877 put_prev_entity+0x1d/0x180 kernel/sched/fair.c:4563 pick_next_task_fair+0x1f6/0x260 kernel/sched/fair.c:7286 __pick_next_task kernel/sched/core.c:5608 [inline] pick_next_task kernel/sched/core.c:6111 [inline] __schedule+0x267/0x690 kernel/sched/core.c:6259 schedule+0x81/0xb0 kernel/sched/core.c:6368 exit_to_user_mode_loop kernel/entry/common.c:163 [inline] exit_to_user_mode_prepare+0xc5/0x190 kernel/entry/common.c:207 irqentry_exit_to_user_mode+0x5/0x10 kernel/entry/common.c:313 irqentry_exit+0xe/0x40 kernel/entry/common.c:404 sysvec_apic_timer_interrupt+0x4a/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 read to 0xffffe8ffffd6edd8 of 8 bytes by task 6867 on cpu 0: cgroup_base_stat_flush kernel/cgroup/rstat.c:328 [inline] cgroup_rstat_flush_locked+0x2e8/0x7e0 kernel/cgroup/rstat.c:161 cgroup_rstat_flush_irqsafe+0x24/0x40 kernel/cgroup/rstat.c:215 __mem_cgroup_flush_stats mm/memcontrol.c:652 [inline] mem_cgroup_flush_stats+0x96/0xf0 mm/memcontrol.c:660 shrink_node+0x2f9/0x1190 mm/vmscan.c:3198 shrink_zones+0x2d1/0x5e0 mm/vmscan.c:3530 do_try_to_free_pages+0x181/0x720 mm/vmscan.c:3588 try_to_free_mem_cgroup_pages+0x1cb/0x420 mm/vmscan.c:3902 try_charge_memcg+0x280/0xa50 mm/memcontrol.c:2599 obj_cgroup_charge_pages+0xac/0x140 mm/memcontrol.c:3017 obj_cgroup_charge+0xe2/0x1b0 mm/memcontrol.c:3286 memcg_slab_pre_alloc_hook mm/slab.h:490 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc mm/slab.c:3298 [inline] kmem_cache_alloc+0x96/0x320 mm/slab.c:3499 kmem_cache_zalloc include/linux/slab.h:705 [inline] alloc_buffer_head+0x2a/0xd0 fs/buffer.c:3310 alloc_page_buffers+0x169/0x2d0 fs/buffer.c:832 grow_dev_page fs/buffer.c:968 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x2e2/0x530 fs/buffer.c:1334 sb_getblk include/linux/buffer_head.h:327 [inline] __ext4_get_inode_loc+0x20d/0xa50 fs/ext4/inode.c:4405 ext4_get_inode_loc fs/ext4/inode.c:4533 [inline] ext4_reserve_inode_write+0xac/0x1f0 fs/ext4/inode.c:5696 __ext4_mark_inode_dirty+0x85/0x5f0 fs/ext4/inode.c:5865 ext4_dirty_inode+0x86/0xa0 fs/ext4/inode.c:5902 __mark_inode_dirty+0x72/0x6c0 fs/fs-writeback.c:2409 mark_inode_dirty_sync include/linux/fs.h:2372 [inline] dquot_free_space include/linux/quotaops.h:382 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_mb_new_blocks+0x1631/0x1ee0 fs/ext4/mballoc.c:5630 ext4_alloc_branch fs/ext4/indirect.c:333 [inline] ext4_ind_map_blocks+0xb1c/0x1740 fs/ext4/indirect.c:628 ext4_map_blocks+0x70b/0xfa0 fs/ext4/inode.c:640 ext4_getblk+0xc6/0x3e0 fs/ext4/inode.c:849 ext4_bread+0x28/0x100 fs/ext4/inode.c:902 ext4_add_entry+0x1389/0x20e0 fs/ext4/namei.c:2352 ext4_add_nondir+0x50/0x1a0 fs/ext4/namei.c:2709 ext4_create+0x237/0x320 fs/ext4/namei.c:2754 lookup_open fs/namei.c:3330 [inline] open_last_lookups fs/namei.c:3400 [inline] path_openat+0xc79/0x1f30 fs/namei.c:3606 do_filp_open+0x105/0x220 fs/namei.c:3636 do_sys_openat2+0xb5/0x2b0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_open fs/open.c:1238 [inline] __se_sys_open fs/open.c:1234 [inline] __x64_sys_open+0xe2/0x110 fs/open.c:1234 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000001be8e6f32 -> 0x00000001be9ceb9b Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 6867 Comm: syz-executor.1 Tainted: G W 5.17.0-rc2-syzkaller-00039-g9f7fb8de5d9b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== syz-executor.1 (6867) used greatest stack depth: 8144 bytes left