syzbot

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BUG: KCSAN: data-race in __filemap_remove_folio / shmem_getpage_gfp

write to 0xffff888137ed7b50 of 8 bytes by task 28869 on cpu 1:
 page_cache_delete mm/filemap.c:145 [inline]
 __filemap_remove_folio+0x1e1/0x2c0 mm/filemap.c:219
 __delete_from_page_cache include/linux/pagemap.h:934 [inline]
 __remove_mapping+0x49d/0x600 mm/vmscan.c:1319
 shrink_page_list+0x1508/0x2620 mm/vmscan.c:1894
 reclaim_pages+0x478/0x640 mm/vmscan.c:2638
 madvise_cold_or_pageout_pte_range+0x63f/0x680 mm/madvise.c:481
 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 mm/pagewalk.c:277 [inline]
 __walk_page_range+0x981/0x1160 mm/pagewalk.c:379
 walk_page_range+0x131/0x300 mm/pagewalk.c:475
 madvise_pageout_page_range mm/madvise.c:534 [inline]
 madvise_pageout mm/madvise.c:571 [inline]
 madvise_vma_behavior mm/madvise.c:961 [inline]
 madvise_walk_vmas mm/madvise.c:1183 [inline]
 do_madvise+0xd11/0x1170 mm/madvise.c:1361
 __do_sys_madvise mm/madvise.c:1374 [inline]
 __se_sys_madvise mm/madvise.c:1372 [inline]
 __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1372
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888137ed7b50 of 8 bytes by task 28870 on cpu 0:
 shmem_recalc_inode mm/shmem.c:362 [inline]
 shmem_getpage_gfp+0xf1b/0x12c0 mm/shmem.c:1912
 shmem_fault+0xd1/0x3c0 mm/shmem.c:2080
 __do_fault mm/memory.c:3868 [inline]
 do_read_fault mm/memory.c:4183 [inline]
 do_fault mm/memory.c:4312 [inline]
 handle_pte_fault mm/memory.c:4570 [inline]
 __handle_mm_fault mm/memory.c:4705 [inline]
 handle_mm_fault+0xba6/0x1590 mm/memory.c:4803
 faultin_page mm/gup.c:969 [inline]
 __get_user_pages+0x342/0xc10 mm/gup.c:1190
 populate_vma_page_range mm/gup.c:1522 [inline]
 __mm_populate+0x24d/0x370 mm/gup.c:1631
 mm_populate include/linux/mm.h:2702 [inline]
 vm_mmap_pgoff+0x160/0x1f0 mm/util.c:524
 ksys_mmap_pgoff+0xc2/0x320 mm/mmap.c:1630
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000000001e9 -> 0x00000000000001e3

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28870 Comm: syz-executor.5 Not tainted 5.17.0-rc8-syzkaller-00061-g34e047aa16c0-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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