================================================================== BUG: KCSAN: data-race in mem_cgroup_iter / mem_cgroup_iter read to 0xffff888114dcde68 of 4 bytes by task 24526 on cpu 0: mem_cgroup_iter+0x93/0x380 mm/memcontrol.c:1019 shrink_node_memcgs mm/vmscan.c:5904 [inline] shrink_node+0x74a/0x1d40 mm/vmscan.c:5928 shrink_zones mm/vmscan.c:6172 [inline] do_try_to_free_pages+0x3c6/0xc50 mm/vmscan.c:6234 try_to_free_mem_cgroup_pages+0x1f3/0x4f0 mm/vmscan.c:6566 try_charge_memcg+0x2bc/0x810 mm/memcontrol.c:2210 try_charge mm/memcontrol-v1.h:20 [inline] charge_memcg mm/memcontrol.c:4438 [inline] mem_cgroup_swapin_charge_folio+0x107/0x1a0 mm/memcontrol.c:4523 __read_swap_cache_async+0x2b7/0x520 mm/swap_state.c:516 swap_cluster_readahead+0x276/0x3f0 mm/swap_state.c:680 swapin_readahead+0xe4/0x760 mm/swap_state.c:882 do_swap_page+0x3da/0x1ef0 mm/memory.c:4119 handle_pte_fault mm/memory.c:5524 [inline] __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x8cb/0x2a30 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 read-write to 0xffff888114dcde68 of 4 bytes by task 20559 on cpu 1: mem_cgroup_iter+0x28e/0x380 mm/memcontrol.c:1080 shrink_node_memcgs mm/vmscan.c:5904 [inline] shrink_node+0x74a/0x1d40 mm/vmscan.c:5928 shrink_zones mm/vmscan.c:6172 [inline] do_try_to_free_pages+0x3c6/0xc50 mm/vmscan.c:6234 try_to_free_mem_cgroup_pages+0x1f3/0x4f0 mm/vmscan.c:6566 try_charge_memcg+0x2bc/0x810 mm/memcontrol.c:2210 try_charge mm/memcontrol-v1.h:20 [inline] charge_memcg mm/memcontrol.c:4438 [inline] mem_cgroup_swapin_charge_folio+0x107/0x1a0 mm/memcontrol.c:4523 __read_swap_cache_async+0x2b7/0x520 mm/swap_state.c:516 swap_cluster_readahead+0x276/0x3f0 mm/swap_state.c:680 swapin_readahead+0xe4/0x760 mm/swap_state.c:882 do_swap_page+0x3da/0x1ef0 mm/memory.c:4119 handle_pte_fault mm/memory.c:5524 [inline] __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x8cb/0x2a30 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 value changed: 0x00000d5b -> 0x00000d5c Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 20559 Comm: syz-executor Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 ================================================================== syz-executor invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0 CPU: 0 UID: 0 PID: 20559 Comm: syz-executor Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xf2/0x150 lib/dump_stack.c:119 dump_stack+0x15/0x20 lib/dump_stack.c:128 dump_header+0x83/0x2d0 mm/oom_kill.c:462 oom_kill_process+0x341/0x4c0 mm/oom_kill.c:1035 out_of_memory+0x9af/0xbe0 mm/oom_kill.c:1173 mem_cgroup_out_of_memory+0x13e/0x190 mm/memcontrol.c:1602 mem_cgroup_oom mm/memcontrol.c:1625 [inline] try_charge_memcg+0x51b/0x810 mm/memcontrol.c:2258 try_charge mm/memcontrol-v1.h:20 [inline] charge_memcg mm/memcontrol.c:4438 [inline] mem_cgroup_swapin_charge_folio+0x107/0x1a0 mm/memcontrol.c:4523 __read_swap_cache_async+0x2b7/0x520 mm/swap_state.c:516 swap_cluster_readahead+0x276/0x3f0 mm/swap_state.c:680 swapin_readahead+0xe4/0x760 mm/swap_state.c:882 do_swap_page+0x3da/0x1ef0 mm/memory.c:4119 handle_pte_fault mm/memory.c:5524 [inline] __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x8cb/0x2a30 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f6192dcefa5 Code: 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 9e 15 15 00 00 74 14 b8 e6 00 00 00 0f 05 f7 d8 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10 89 74 RSP: 002b:00007ffda851b248 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 000000000000015a RCX: 00007f6192dcefa3 RDX: 00007ffda851b260 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffda851b2bc R08: 000000002bde8210 R09: 7fffffffffffffff R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000042679 R14: 000000000004266e R15: 00007ffda851b310 memory: usage 307200kB, limit 307200kB, failcnt 3342 memory+swap: usage 307524kB, limit 9007199254740988kB, failcnt 0 kmem: usage 307100kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz3: cache 102400 rss 0 shmem 0 mapped_file 102400 dirty 102400 writeback 0 workingset_refault_anon 121 workingset_refault_file 107 swap 331776 swapcached 0 pgpgin 162395 pgpgout 162370 pgfault 207449 pgmajfault 40 inactive_anon 0 active_anon 0 inactive_file 0 active_file 102400 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 102400 total_rss 0 total_shmem 0 total_mapped_file 102400 total_dirty 102400 total_writeback 0 total_workingset_refault_anon 121 total_workingset_refault_file 107 total_swap 331776 total_swapcached 0 total_pgpgin 162395 total_pgpgout 162370 total_pgfault 207449 total_pgmajfault 40 total_inactive_anon 0 total_active_anon 0 total_inactive_file 0 total_active_file 102400 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz3,mems_allowed=0,oom_memcg=/syz3,task_memcg=/syz3,task=syz.3.4513,pid=24526,uid=0 Memory cgroup out of memory: Killed process 24526 (syz.3.4513) total-vm:88984kB, anon-rss:568kB, file-rss:15976kB, shmem-rss:0kB, UID:0 pgtables:108kB oom_score_adj:1000