syzbot

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BUG: KCSAN: data-race in __lru_add_drain_all / folio_add_lru

read-write to 0xffff888237c27bf8 of 1 bytes by task 9555 on cpu 0:
 folio_batch_add include/linux/pagevec.h:129 [inline]
 folio_batch_add_and_move mm/swap.c:261 [inline]
 folio_add_lru+0x5a/0x140 mm/swap.c:547
 folio_add_lru_vma+0x44/0x60 mm/swap.c:567
 lru_cache_add_inactive_or_unevictable+0x45/0xf0 mm/folio-compat.c:82
 wp_page_copy+0x933/0x1710 mm/memory.c:3158
 do_wp_page+0x22a/0x640 mm/memory.c:3447
 handle_pte_fault mm/memory.c:4949 [inline]
 __handle_mm_fault mm/memory.c:5073 [inline]
 handle_mm_fault+0x644/0xb20 mm/memory.c:5219
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1428
 handle_page_fault arch/x86/mm/fault.c:1519 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1575
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
 __put_user_nocheck_4+0x3/0x10 arch/x86/lib/putuser.S:98
 ____sys_recvmsg+0x215/0x2e0 net/socket.c:2708
 ___sys_recvmsg net/socket.c:2737 [inline]
 do_recvmmsg+0x2f1/0x710 net/socket.c:2831
 __sys_recvmmsg net/socket.c:2910 [inline]
 __do_sys_recvmmsg net/socket.c:2933 [inline]
 __se_sys_recvmmsg net/socket.c:2926 [inline]
 __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2926
 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 0xffff888237c27bf8 of 1 bytes by task 9548 on cpu 1:
 folio_batch_count include/linux/pagevec.h:108 [inline]
 cpu_needs_drain mm/swap.c:829 [inline]
 __lru_add_drain_all+0x134/0x3c0 mm/swap.c:923
 lru_add_drain_all+0xc/0x10 mm/swap.c:939
 invalidate_bdev+0x56/0x80 block/bdev.c:86
 invalidate_disk+0x25/0xb0 block/genhd.c:693
 __loop_clr_fd+0x176/0x3c0 drivers/block/loop.c:1164
 loop_clr_fd drivers/block/loop.c:1257 [inline]
 lo_ioctl+0xd8c/0x1290 drivers/block/loop.c:1563
 blkdev_ioctl+0x215/0x440 block/ioctl.c:616
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 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: 0x0b -> 0x0c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9548 Comm: syz-executor.2 Not tainted 6.2.0-rc5-syzkaller-00108-g83abd4d4c4be-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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