================================================================== BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping write to 0xffffea0004b1ac58 of 8 bytes by task 12063 on cpu 1: page_cache_delete mm/filemap.c:144 [inline] __filemap_remove_folio+0x1a5/0x2a0 mm/filemap.c:224 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:253 truncate_inode_folio+0x42/0x50 mm/truncate.c:176 shmem_undo_range+0x244/0xa80 mm/shmem.c:1153 shmem_fallocate+0x799/0x840 mm/shmem.c:3817 vfs_fallocate+0x3b6/0x400 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0x7a/0xd0 fs/open.c:369 x64_sys_call+0x2514/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:286 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffea0004b1ac58 of 8 bytes by task 12058 on cpu 0: folio_mapping+0xa1/0x120 mm/util.c:702 folio_evictable mm/internal.h:499 [inline] sort_folio mm/vmscan.c:4479 [inline] scan_folios mm/vmscan.c:4606 [inline] isolate_folios mm/vmscan.c:4702 [inline] evict_folios+0xdd9/0x3520 mm/vmscan.c:4732 try_to_shrink_lruvec+0x5b5/0x950 mm/vmscan.c:4907 lru_gen_shrink_lruvec mm/vmscan.c:5056 [inline] shrink_lruvec+0x22e/0x1b50 mm/vmscan.c:5815 shrink_node_memcgs mm/vmscan.c:6051 [inline] shrink_node+0x686/0x2120 mm/vmscan.c:6092 shrink_zones mm/vmscan.c:6336 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6398 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6726 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2357 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2800 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2844 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:5165 alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2507 vm_area_alloc_pages mm/vmalloc.c:3642 [inline] __vmalloc_area_node mm/vmalloc.c:3720 [inline] __vmalloc_node_range_noprof+0x6f2/0xe00 mm/vmalloc.c:3893 __kvmalloc_node_noprof+0x30f/0x4e0 mm/slub.c:5074 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0x3cc/0x960 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x4c6/0x590 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2552 nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x142/0x180 net/socket.c:729 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2614 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2703 x64_sys_call+0x191e/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffff888104926aa0 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 12058 Comm: syz.6.3401 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ================================================================== syz.6.3401 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=1000 CPU: 0 UID: 0 PID: 12058 Comm: syz.6.3401 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0xe8/0x140 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x81/0x220 mm/oom_kill.c:467 oom_kill_process+0x342/0x400 mm/oom_kill.c:1040 out_of_memory+0x979/0xb80 mm/oom_kill.c:1178 mem_cgroup_out_of_memory mm/memcontrol.c:1649 [inline] mem_cgroup_oom mm/memcontrol.c:1672 [inline] try_charge_memcg+0x5e6/0x9e0 mm/memcontrol.c:2399 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2800 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2844 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:5165 alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2507 vm_area_alloc_pages mm/vmalloc.c:3642 [inline] __vmalloc_area_node mm/vmalloc.c:3720 [inline] __vmalloc_node_range_noprof+0x6f2/0xe00 mm/vmalloc.c:3893 __kvmalloc_node_noprof+0x30f/0x4e0 mm/slub.c:5074 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0x3cc/0x960 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x4c6/0x590 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2552 nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x142/0x180 net/socket.c:729 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2614 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2703 x64_sys_call+0x191e/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4a9119ebe9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4a8fbff038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4a913c5fa0 RCX: 00007f4a9119ebe9 RDX: 0000000000000800 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f4a91221e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4a913c6038 R14: 00007f4a913c5fa0 R15: 00007ffdf0c11a68 memory: usage 307200kB, limit 307200kB, failcnt 390 memory+swap: usage 307280kB, limit 9007199254740988kB, failcnt 0 kmem: usage 307060kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz6: cache 0 rss 36864 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 100 workingset_refault_file 47 swap 81920 swapcached 114688 pgpgin 63027 pgpgout 62998 pgfault 53185 pgmajfault 41 inactive_anon 106496 active_anon 8192 inactive_file 4096 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 36864 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 100 total_workingset_refault_file 47 total_swap 81920 total_swapcached 114688 total_pgpgin 63027 total_pgpgout 62998 total_pgfault 53185 total_pgmajfault 41 total_inactive_anon 106496 total_active_anon 8192 total_inactive_file 4096 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz6,task_memcg=/syz6,task=syz.6.3401,pid=12057,uid=0 Memory cgroup out of memory: Killed process 12058 (syz.6.3401) total-vm:95812kB, anon-rss:944kB, file-rss:22184kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:1000 syz.6.3401 (12058) used greatest stack depth: 6384 bytes left