================================================================== BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping write to 0xffffea0004ebb1d8 of 8 bytes by task 10198 on cpu 1: page_cache_delete mm/filemap.c:145 [inline] __filemap_remove_folio+0x201/0x2e0 mm/filemap.c:227 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:257 truncate_inode_folio+0x42/0x50 mm/truncate.c:176 shmem_undo_range+0x27f/0xb60 mm/shmem.c:1157 shmem_truncate_range mm/shmem.c:1289 [inline] shmem_evict_inode+0x12d/0x580 mm/shmem.c:1420 evict+0x2a5/0x510 fs/inode.c:822 iput_final fs/inode.c:2015 [inline] iput+0x430/0x5a0 fs/inode.c:2064 dentry_unlink_inode+0x24a/0x260 fs/dcache.c:479 dentry_kill+0x184/0x500 fs/dcache.c:826 finish_dput+0x16/0x1d0 fs/dcache.c:1001 dput+0x48/0x50 fs/dcache.c:1042 __fput+0x43e/0x630 fs/file_table.c:520 ____fput+0x1c/0x30 fs/file_table.c:540 task_work_run+0x130/0x1a0 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x4a4/0x1510 kernel/exit.c:1011 do_group_exit+0xfe/0x140 kernel/exit.c:1154 get_signal+0xe07/0xf10 kernel/signal.c:3051 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop kernel/entry/common.c:101 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] irqentry_exit+0x14d/0x610 kernel/entry/common.c:165 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 read to 0xffffea0004ebb1d8 of 8 bytes by task 10268 on cpu 0: folio_mapping+0xa1/0xe0 mm/util.c:732 folio_evictable mm/internal.h:650 [inline] sort_folio mm/vmscan.c:4669 [inline] scan_folios mm/vmscan.c:4766 [inline] isolate_folios mm/vmscan.c:4854 [inline] evict_folios+0xd80/0x2830 mm/vmscan.c:4897 try_to_shrink_lruvec+0x8fd/0xb30 mm/vmscan.c:5076 lru_gen_shrink_lruvec mm/vmscan.c:5221 [inline] shrink_lruvec+0x252/0x1d40 mm/vmscan.c:5981 shrink_node_memcgs mm/vmscan.c:6220 [inline] shrink_node+0x67c/0x2000 mm/vmscan.c:6264 shrink_zones mm/vmscan.c:6503 [inline] do_try_to_free_pages+0x408/0xca0 mm/vmscan.c:6565 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6887 try_charge_memcg+0x422/0xae0 mm/memcontrol.c:2718 try_charge mm/memcontrol.c:2860 [inline] obj_cgroup_charge_pages mm/memcontrol.c:3161 [inline] __memcg_kmem_charge_page+0x1af/0x3b0 mm/memcontrol.c:3205 __alloc_frozen_pages_noprof+0x21d/0x400 mm/page_alloc.c:5453 alloc_pages_mpol+0xaf/0x1d0 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0x94/0x140 mm/mempolicy.c:2577 vm_area_alloc_pages mm/vmalloc.c:3764 [inline] __vmalloc_area_node mm/vmalloc.c:3914 [inline] __vmalloc_node_range_noprof+0x96f/0x1000 mm/vmalloc.c:4104 __kvmalloc_node_noprof+0x3be/0x5c0 mm/slub.c:7042 futex_hash_allocate+0x163/0x890 kernel/futex/core.c:1877 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:2073 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x13b0 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2421/0x2550 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffff88811b2deab0 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 10268 Comm: syz.2.2232 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 ================================================================== syz.2.2232 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=0 CPU: 0 UID: 0 PID: 10268 Comm: syz.2.2232 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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+0x294/0x420 mm/oom_kill.c:1031 out_of_memory+0x981/0xbc0 mm/oom_kill.c:1169 mem_cgroup_out_of_memory mm/memcontrol.c:1952 [inline] mem_cgroup_oom mm/memcontrol.c:1975 [inline] try_charge_memcg+0x6ba/0xae0 mm/memcontrol.c:2760 try_charge mm/memcontrol.c:2860 [inline] obj_cgroup_charge_pages mm/memcontrol.c:3161 [inline] __memcg_kmem_charge_page+0x1af/0x3b0 mm/memcontrol.c:3205 __alloc_frozen_pages_noprof+0x21d/0x400 mm/page_alloc.c:5453 alloc_pages_mpol+0xaf/0x1d0 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0x94/0x140 mm/mempolicy.c:2577 vm_area_alloc_pages mm/vmalloc.c:3764 [inline] __vmalloc_area_node mm/vmalloc.c:3914 [inline] __vmalloc_node_range_noprof+0x96f/0x1000 mm/vmalloc.c:4104 __kvmalloc_node_noprof+0x3be/0x5c0 mm/slub.c:7042 futex_hash_allocate+0x163/0x890 kernel/futex/core.c:1877 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:2073 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x13b0 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2421/0x2550 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb4e54fe159 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:00007fb4e3f36028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007fb4e5786090 RCX: 00007fb4e54fe159 RDX: 0000000001000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007fb4e559506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb4e5786128 R14: 00007fb4e5786090 R15: 00007ffc50285cf8 memory: usage 307200kB, limit 307200kB, failcnt 339 memory+swap: usage 308220kB, limit 9007199254740988kB, failcnt 0 kmem: usage 307196kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz2: cache 0 rss 0 shmem 0 mapped_file 2101248 dirty 0 writeback 0 workingset_refault_anon 2915 workingset_refault_file 642 swap 1044480 swapcached 43810816 pgpgin 259608 pgpgout 259607 pgfault 214934 pgmajfault 1769 inactive_anon 0 active_anon 0 inactive_file 0 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 0 total_shmem 0 total_mapped_file 2101248 total_dirty 0 total_writeback 0 total_workingset_refault_anon 2915 total_workingset_refault_file 642 total_swap 1044480 total_swapcached 43810816 total_pgpgin 259608 total_pgpgout 259607 total_pgfault 214934 total_pgmajfault 1769 total_inactive_anon 0 total_active_anon 0 total_inactive_file 0 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz2,task_memcg=/syz2,task=syz.2.279,pid=4549,uid=0 Memory cgroup out of memory: Killed process 4549 (syz.2.279) total-vm:96104kB, anon-rss:1244kB, file-rss:20804kB, shmem-rss:0kB, UID:0 pgtables:96kB oom_score_adj:1000