================================================================== BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping write to 0xffffea0005b15198 of 8 bytes by task 6724 on cpu 0: page_cache_delete mm/filemap.c:145 [inline] __filemap_remove_folio+0x201/0x2e0 mm/filemap.c:228 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:258 truncate_inode_folio+0x42/0x50 mm/truncate.c:176 shmem_undo_range+0x26d/0xb10 mm/shmem.c:1145 shmem_truncate_range mm/shmem.c:1277 [inline] shmem_evict_inode+0x12e/0x540 mm/shmem.c:1407 evict+0x2af/0x510 fs/inode.c:841 iput_final fs/inode.c:1960 [inline] iput+0x41a/0x580 fs/inode.c:2009 dentry_unlink_inode+0x26f/0x290 fs/dcache.c:476 __dentry_kill+0x145/0x4d0 fs/dcache.c:718 finish_dput+0x2b/0x200 fs/dcache.c:927 dput+0x52/0x60 fs/dcache.c:976 __fput+0x444/0x630 fs/file_table.c:518 fput_close_sync+0xad/0x190 fs/file_table.c:615 __do_sys_close fs/open.c:1507 [inline] __se_sys_close fs/open.c:1492 [inline] __x64_sys_close+0x55/0xf0 fs/open.c:1492 x64_sys_call+0x275d/0x3020 arch/x86/include/generated/asm/syscalls_64.h:4 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffea0005b15198 of 8 bytes by task 6708 on cpu 1: folio_mapping+0xa1/0xe0 mm/util.c:732 folio_evictable mm/internal.h:584 [inline] evict_folios+0x297c/0x3370 mm/vmscan.c:4864 try_to_shrink_lruvec+0x858/0xc20 mm/vmscan.c:5009 lru_gen_shrink_lruvec mm/vmscan.c:5173 [inline] shrink_lruvec+0x256/0x1bc0 mm/vmscan.c:5932 shrink_node_memcgs mm/vmscan.c:6171 [inline] shrink_node+0x697/0x20a0 mm/vmscan.c:6215 shrink_zones mm/vmscan.c:6454 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6516 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6838 try_charge_memcg+0x373/0xa10 mm/memcontrol.c:2627 obj_cgroup_charge_pages mm/memcontrol.c:3069 [inline] __memcg_kmem_charge_page+0x1ce/0x3d0 mm/memcontrol.c:3113 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5238 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0x8f/0x140 mm/mempolicy.c:2581 vm_area_alloc_pages mm/vmalloc.c:3728 [inline] __vmalloc_area_node mm/vmalloc.c:3878 [inline] __vmalloc_node_range_noprof+0xaed/0x11c0 mm/vmalloc.c:4064 __kvmalloc_node_noprof+0x3d4/0x640 mm/slub.c:6861 futex_hash_allocate+0x190/0x9a0 kernel/futex/core.c:1815 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1961 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x1400 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffff8881080d49f0 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 6708 Comm: syz.7.577 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== syz.7.577 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=1000 CPU: 1 UID: 0 PID: 6708 Comm: syz.7.577 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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:464 oom_kill_process+0x295/0x350 mm/oom_kill.c:1031 out_of_memory+0x97d/0xb80 mm/oom_kill.c:1169 mem_cgroup_out_of_memory mm/memcontrol.c:1907 [inline] mem_cgroup_oom mm/memcontrol.c:1930 [inline] try_charge_memcg+0x62f/0xa10 mm/memcontrol.c:2669 obj_cgroup_charge_pages mm/memcontrol.c:3069 [inline] __memcg_kmem_charge_page+0x1ce/0x3d0 mm/memcontrol.c:3113 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5238 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0x8f/0x140 mm/mempolicy.c:2581 vm_area_alloc_pages mm/vmalloc.c:3728 [inline] __vmalloc_area_node mm/vmalloc.c:3878 [inline] __vmalloc_node_range_noprof+0xaed/0x11c0 mm/vmalloc.c:4064 __kvmalloc_node_noprof+0x3d4/0x640 mm/slub.c:6861 futex_hash_allocate+0x190/0x9a0 kernel/futex/core.c:1815 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1961 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x1400 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd3449bce59 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:00007fd343417028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007fd344c35fa0 RCX: 00007fd3449bce59 RDX: 0000000001000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007fd344a52d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd344c36038 R14: 00007fd344c35fa0 R15: 00007fffb39c61b8 memory: usage 307200kB, limit 307200kB, failcnt 243 memory+swap: usage 245252kB, limit 9007199254740988kB, failcnt 0 kmem: usage 244716kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz7: cache 8192 rss 0 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 115 workingset_refault_file 10 swap 462848 swapcached 1667072 pgpgin 28058 pgpgout 28056 pgfault 32492 pgmajfault 65 inactive_anon 0 active_anon 0 inactive_file 4096 active_file 4096 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 8192 total_rss 0 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 115 total_workingset_refault_file 10 total_swap 462848 total_swapcached 1667072 total_pgpgin 28058 total_pgpgout 28056 total_pgfault 32492 total_pgmajfault 65 total_inactive_anon 0 total_active_anon 0 total_inactive_file 4096 total_active_file 4096 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz7,task_memcg=/syz7,task=syz.7.577,pid=6707,uid=0 Memory cgroup out of memory: Killed process 6707 (syz.7.577) total-vm:94300kB, anon-rss:1228kB, file-rss:22288kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:1000