syzbot

==================================================================
BUG: KCSAN: data-race in page_cache_delete / shmem_getpage_gfp

read-write to 0xffff888131da2e68 of 8 bytes by task 27508 on cpu 0:
 page_cache_delete+0x35d/0x390 mm/filemap.c:145
 __filemap_remove_folio+0x3b/0xf0 mm/filemap.c:223
 __remove_mapping+0x42a/0x530 mm/vmscan.c:1366
 shrink_page_list+0x121b/0x1f10 mm/vmscan.c:1973
 reclaim_page_list mm/vmscan.c:2620 [inline]
 reclaim_pages+0x3de/0x550 mm/vmscan.c:2656
 madvise_cold_or_pageout_pte_range+0x8ea/0x930 mm/madvise.c:493
 walk_pmd_range mm/pagewalk.c:128 [inline]
 walk_pud_range mm/pagewalk.c:205 [inline]
 walk_p4d_range mm/pagewalk.c:240 [inline]
 walk_pgd_range+0x832/0xd00 mm/pagewalk.c:277
 __walk_page_range+0xba/0x300 mm/pagewalk.c:379
 walk_page_range+0x21b/0x340 mm/pagewalk.c:477
 madvise_pageout_page_range mm/madvise.c:551 [inline]
 madvise_pageout mm/madvise.c:588 [inline]
 madvise_vma_behavior mm/madvise.c:1009 [inline]
 madvise_walk_vmas mm/madvise.c:1235 [inline]
 do_madvise+0xfe7/0x1af0 mm/madvise.c:1413
 __do_sys_madvise mm/madvise.c:1426 [inline]
 __se_sys_madvise mm/madvise.c:1424 [inline]
 __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1424
 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 0xffff888131da2e68 of 8 bytes by task 27498 on cpu 1:
 shmem_recalc_inode mm/shmem.c:363 [inline]
 shmem_getpage_gfp+0xd8b/0x1750 mm/shmem.c:1961
 shmem_fault+0xd2/0x350 mm/shmem.c:2128
 __do_fault mm/memory.c:4173 [inline]
 do_read_fault mm/memory.c:4524 [inline]
 do_fault+0x500/0xb20 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
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1407
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
 copy_user_short_string+0xa/0x40 arch/x86/lib/copy_user_64.S:231
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 _copy_from_user+0x78/0xc0 lib/usercopy.c:16
 copy_from_user include/linux/uaccess.h:152 [inline]
 copy_msghdr_from_user net/socket.c:2413 [inline]
 recvmsg_copy_msghdr+0x66/0x2d0 net/socket.c:2667
 ___sys_recvmsg net/socket.c:2739 [inline]
 do_recvmmsg+0x2ac/0x710 net/socket.c:2837
 __sys_recvmmsg net/socket.c:2916 [inline]
 __do_sys_recvmmsg net/socket.c:2939 [inline]
 __se_sys_recvmmsg net/socket.c:2932 [inline]
 __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2932
 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: 0x00000000000008d0 -> 0x00000000000008ce

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27498 Comm: syz-executor.5 Tainted: G        W          6.0.0-syzkaller-07362-g62e6e5940c0c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
==================================================================