================================================================== BUG: KCSAN: data-race in drain_all_stock / try_charge_memcg write to 0xffff888237c22fe8 of 8 bytes by task 24335 on cpu 0: refill_stock mm/memcontrol.c:2221 [inline] try_charge_memcg+0x846/0xa10 mm/memcontrol.c:2683 obj_cgroup_charge_pages+0xce/0x210 mm/memcontrol.c:2974 obj_cgroup_charge+0xe2/0x1b0 mm/memcontrol.c:3256 memcg_slab_pre_alloc_hook mm/slab.h:287 [inline] slab_pre_alloc_hook mm/slab.h:497 [inline] slab_alloc_node mm/slab.c:3222 [inline] kmem_cache_alloc_node+0xae/0x2d0 mm/slab.c:3599 alloc_task_struct_node kernel/fork.c:170 [inline] dup_task_struct+0x63/0x680 kernel/fork.c:882 copy_process+0x3f4/0x2f30 kernel/fork.c:2025 kernel_clone+0x15c/0x6a0 kernel/fork.c:2583 __do_sys_clone kernel/fork.c:2700 [inline] __se_sys_clone kernel/fork.c:2684 [inline] __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2684 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888237c22fe8 of 8 bytes by task 24330 on cpu 1: drain_all_stock+0xbc/0x4b0 mm/memcontrol.c:2255 try_charge_memcg+0x6bc/0xa10 mm/memcontrol.c:2616 try_charge mm/memcontrol.c:2736 [inline] charge_memcg+0x51/0x1a0 mm/memcontrol.c:6707 __mem_cgroup_charge+0x25/0xa0 mm/memcontrol.c:6728 mem_cgroup_charge include/linux/memcontrol.h:720 [inline] __filemap_add_folio+0x3a8/0x4d0 mm/filemap.c:891 filemap_add_folio+0x6b/0x150 mm/filemap.c:984 add_to_page_cache_lru+0x4e/0x70 mm/folio-compat.c:115 page_cache_ra_unbounded+0x274/0x430 mm/readahead.c:221 ondemand_readahead+0x4f8/0x700 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:579 page_cache_sync_readahead include/linux/pagemap.h:980 [inline] filemap_get_pages mm/filemap.c:2541 [inline] filemap_read+0x3d8/0x1720 mm/filemap.c:2624 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2775 ext4_file_read_iter+0x1db/0x290 call_read_iter include/linux/fs.h:2155 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0x66c/0x750 fs/read_write.c:481 ksys_read+0xd9/0x190 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000000 -> 0xffff88813155c000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 24330 Comm: syz-executor.2 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== syz-executor.2 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 0 PID: 24330 Comm: syz-executor.2 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd6/0x122 lib/dump_stack.c:106 dump_stack+0x11/0x1b lib/dump_stack.c:113 dump_header+0x98/0x410 mm/oom_kill.c:463 oom_kill_process+0x18e/0x3f0 mm/oom_kill.c:980 out_of_memory+0x5ed/0x890 mm/oom_kill.c:1117 mem_cgroup_out_of_memory mm/memcontrol.c:1579 [inline] mem_cgroup_oom+0x484/0x520 mm/memcontrol.c:1814 try_charge_memcg+0x736/0xa10 mm/memcontrol.c:2655 try_charge mm/memcontrol.c:2736 [inline] charge_memcg+0x51/0x1a0 mm/memcontrol.c:6707 __mem_cgroup_charge+0x25/0xa0 mm/memcontrol.c:6728 mem_cgroup_charge include/linux/memcontrol.h:720 [inline] __filemap_add_folio+0x3a8/0x4d0 mm/filemap.c:891 filemap_add_folio+0x6b/0x150 mm/filemap.c:984 add_to_page_cache_lru+0x4e/0x70 mm/folio-compat.c:115 filemap_create_page mm/filemap.c:2490 [inline] filemap_get_pages mm/filemap.c:2548 [inline] filemap_read+0x80e/0x1720 mm/filemap.c:2624 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2775 ext4_file_read_iter+0x1db/0x290 call_read_iter include/linux/fs.h:2155 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0x66c/0x750 fs/read_write.c:481 ksys_read+0xd9/0x190 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2e21c2aae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2e1f9a1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f2e21d3df60 RCX: 00007f2e21c2aae9 RDX: 00000000fffffe47 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 00007f2e21c84f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca696e22f R14: 00007f2e1f9a1300 R15: 0000000000022000 memory: usage 307200kB, limit 307200kB, failcnt 59132 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz2: anon 2412544 file 306618368 kernel_stack 327680 pagetables 2129920 percpu 0 sock 0 shmem 306561024 file_mapped 0 file_dirty 0 file_writeback 0 swapcached 0 inactive_anon 5681152 active_anon 303280128 inactive_file 0 active_file 0 unevictable 12288 slab_reclaimable 1265320 slab_unreclaimable 1427872 slab 2693192 workingset_refault_anon 0 workingset_refault_file 60801 workingset_activate_anon 0 workingset_activate_file 458 workingset_restore_anon 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz2,mems_allowed=0,oom_memcg=/syz2,task_memcg=/syz2,task=syz-executor.2,pid=24327,uid=0 Memory cgroup out of memory: Killed process 24330 (syz-executor.2) total-vm:85348kB, anon-rss:692kB, file-rss:35836kB, shmem-rss:0kB, UID:0 pgtables:136kB oom_score_adj:1000