================================================================== BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping write to 0xffffea00047bb058 of 8 bytes by task 26224 on cpu 1: page_cache_delete mm/filemap.c:145 [inline] __filemap_remove_folio+0x201/0x310 mm/filemap.c:228 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:257 truncate_inode_folio+0x42/0x50 mm/truncate.c:176 shmem_undo_range+0x26d/0xb10 mm/shmem.c:1145 shmem_fallocate+0x881/0x920 mm/shmem.c:3796 vfs_fallocate+0x3b6/0x450 fs/open.c:340 ksys_fallocate fs/open.c:364 [inline] __do_sys_fallocate fs/open.c:369 [inline] __se_sys_fallocate fs/open.c:367 [inline] __x64_sys_fallocate+0x7a/0xd0 fs/open.c:367 x64_sys_call+0x298e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:286 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffea00047bb058 of 8 bytes by task 26223 on cpu 0: folio_mapping+0xa1/0xe0 mm/util.c:703 folio_evictable mm/internal.h:568 [inline] move_folios_to_lru+0x128/0x6d0 mm/vmscan.c:1907 evict_folios+0x31f8/0x35c0 mm/vmscan.c:4748 try_to_shrink_lruvec+0x81b/0xbf0 mm/vmscan.c:4881 lru_gen_shrink_lruvec mm/vmscan.c:5030 [inline] shrink_lruvec+0x255/0x1c60 mm/vmscan.c:5784 shrink_node_memcgs mm/vmscan.c:6020 [inline] shrink_node+0x67a/0x2130 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x408/0xc80 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x1f5/0x470 mm/vmscan.c:6683 try_charge_memcg+0x37e/0xa10 mm/memcontrol.c:2414 obj_cgroup_charge_pages+0x23/0xc0 mm/memcontrol.c:2857 __memcg_kmem_charge_page+0x9e/0x170 mm/memcontrol.c:2901 __alloc_frozen_pages_noprof+0x18a/0x360 mm/page_alloc.c:5267 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2484 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline] alloc_pages_noprof+0x8f/0x130 mm/mempolicy.c:2575 vm_area_alloc_pages mm/vmalloc.c:3731 [inline] __vmalloc_area_node mm/vmalloc.c:3876 [inline] __vmalloc_node_range_noprof+0xa46/0x12b0 mm/vmalloc.c:4064 __kvmalloc_node_noprof+0x3d4/0x650 mm/slub.c:6783 ip_set_alloc+0x24/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1567 ip_set_create+0x3cf/0x970 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x509/0x5d0 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550 nfnetlink_rcv+0x167/0x1720 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x563/0x5b0 net/socket.c:2592 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2681 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffff88811b6e9f00 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 26223 Comm: syz.1.6599 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== syz.1.6599 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: 26223 Comm: syz.1.6599 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x80/0x240 mm/oom_kill.c:467 oom_kill_process+0x295/0x350 mm/oom_kill.c:1047 out_of_memory+0x97d/0xb80 mm/oom_kill.c:1185 mem_cgroup_out_of_memory mm/memcontrol.c:1695 [inline] mem_cgroup_oom mm/memcontrol.c:1718 [inline] try_charge_memcg+0x62e/0xa10 mm/memcontrol.c:2456 obj_cgroup_charge_pages+0x23/0xc0 mm/memcontrol.c:2857 __memcg_kmem_charge_page+0x9e/0x170 mm/memcontrol.c:2901 __alloc_frozen_pages_noprof+0x18a/0x360 mm/page_alloc.c:5267 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2484 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline] alloc_pages_noprof+0x8f/0x130 mm/mempolicy.c:2575 vm_area_alloc_pages mm/vmalloc.c:3731 [inline] __vmalloc_area_node mm/vmalloc.c:3876 [inline] __vmalloc_node_range_noprof+0xa46/0x12b0 mm/vmalloc.c:4064 __kvmalloc_node_noprof+0x3d4/0x650 mm/slub.c:6783 ip_set_alloc+0x24/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1567 ip_set_create+0x3cf/0x970 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x509/0x5d0 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550 nfnetlink_rcv+0x167/0x1720 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x563/0x5b0 net/socket.c:2592 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2681 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9882fdc799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9881a2f028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9883255fa0 RCX: 00007f9882fdc799 RDX: 0000000000000880 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f9883072bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9883256038 R14: 00007f9883255fa0 R15: 00007ffef23873b8 memory: usage 306476kB, limit 307200kB, failcnt 3560 memory+swap: usage 114380kB, limit 9007199254740988kB, failcnt 0 kmem: usage 106604kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: cache 0 rss 122880 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 724 workingset_refault_file 922 swap 45056 swapcached 37249024 pgpgin 943766 pgpgout 943720 pgfault 815082 pgmajfault 365 inactive_anon 49152 active_anon 135168 inactive_file 4096 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 122880 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 724 total_workingset_refault_file 922 total_swap 45056 total_swapcached 37249024 total_pgpgin 943766 total_pgpgout 943720 total_pgfault 815082 total_pgmajfault 365 total_inactive_anon 49152 total_active_anon 135168 total_inactive_file 4096 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz.1.6599,pid=26222,uid=0 Memory cgroup out of memory: Killed process 26223 (syz.1.6599) total-vm:94088kB, anon-rss:1336kB, file-rss:22428kB, shmem-rss:0kB, UID:0 pgtables:124kB oom_score_adj:1000