================================================================== BUG: KCSAN: data-race in filemap_map_pages / shmem_write_end write to 0xffff8880a21afcd0 of 8 bytes by task 11839 on cpu 1: i_size_write include/linux/fs.h:888 [inline] shmem_write_end+0x83/0x4f0 mm/shmem.c:2498 generic_perform_write+0x1d3/0x320 mm/filemap.c:3320 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3438 generic_file_write_iter+0x28c/0x38c mm/filemap.c:3470 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880a21afcd0 of 8 bytes by task 11843 on cpu 0: filemap_map_pages+0x812/0x990 mm/filemap.c:2643 do_fault_around mm/memory.c:3546 [inline] do_read_fault mm/memory.c:3580 [inline] do_fault mm/memory.c:3714 [inline] handle_pte_fault mm/memory.c:3945 [inline] __handle_mm_fault+0x2a92/0x2e00 mm/memory.c:4075 handle_mm_fault+0x21b/0x530 mm/memory.c:4112 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203 copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:204 copy_from_user include/linux/uaccess.h:144 [inline] __get_filter+0x100/0x1c0 net/core/filter.c:1476 sk_attach_filter+0x27/0xa0 net/core/filter.c:1507 sock_setsockopt+0x16d1/0x1850 net/core/sock.c:999 __sys_setsockopt+0x34b/0x370 net/socket.c:2113 __do_sys_setsockopt net/socket.c:2133 [inline] __se_sys_setsockopt net/socket.c:2130 [inline] __x64_sys_setsockopt+0x70/0x90 net/socket.c:2130 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 11843 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================