syzbot

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BUG: KCSAN: data-race in next_uptodate_page / simple_write_end

write to 0xffff88812dd945e0 of 8 bytes by task 7925 on cpu 0:
 i_size_write include/linux/fs.h:886 [inline]
 simple_write_end+0x11e/0x2f0 fs/libfs.c:618
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3749
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3866
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3898
 call_write_iter include/linux/fs.h:2187 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88812dd945e0 of 8 bytes by task 7930 on cpu 1:
 i_size_read include/linux/fs.h:864 [inline]
 next_uptodate_page+0x2d4/0x520 mm/filemap.c:3293
 next_map_page mm/filemap.c:3318 [inline]
 filemap_map_pages+0x9d1/0xae0 mm/filemap.c:3390
 do_fault_around mm/memory.c:4493 [inline]
 do_read_fault mm/memory.c:4519 [inline]
 do_fault+0x433/0xb20 mm/memory.c:4653
 handle_pte_fault mm/memory.c:4917 [inline]
 __handle_mm_fault mm/memory.c:5059 [inline]
 handle_mm_fault+0x889/0xa90 mm/memory.c:5157
 faultin_page mm/gup.c:990 [inline]
 __get_user_pages+0x34a/0xc40 mm/gup.c:1219
 populate_vma_page_range mm/gup.c:1576 [inline]
 __mm_populate+0x26e/0x3a0 mm/gup.c:1689
 mm_populate include/linux/mm.h:2663 [inline]
 vm_mmap_pgoff+0x160/0x1f0 mm/util.c:557
 ksys_mmap_pgoff+0x265/0x320 mm/mmap.c:1586
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000fc0000 -> 0x0000000000fc5000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7930 Comm: syz-executor.0 Not tainted 6.0.0-rc7-syzkaller-00250-ga962b54e162c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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