syzbot

loop4: detected capacity change from 0 to 264192
FAT-fs (loop4): Unrecognized mount option "umask=00000000000000000000011"errors=continue" or missing value
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BUG: KCSAN: data-race in munlock_page / need_mlock_page_drain

read-write to 0xffff888237c27ee0 of 1 bytes by task 22141 on cpu 0:
 pagevec_add include/linux/pagevec.h:64 [inline]
 munlock_page+0x86/0x2a0 mm/mlock.c:302
 munlock_vma_page mm/internal.h:537 [inline]
 page_remove_rmap+0x17e/0x220 mm/rmap.c:1464
 zap_pte_range+0x6bd/0x15a0 mm/memory.c:1456
 zap_pmd_range mm/memory.c:1577 [inline]
 zap_pud_range mm/memory.c:1606 [inline]
 zap_p4d_range mm/memory.c:1627 [inline]
 unmap_page_range+0x3ac/0x730 mm/memory.c:1648
 unmap_single_vma+0x151/0x1d0 mm/memory.c:1694
 unmap_vmas+0x135/0x1e0 mm/memory.c:1733
 exit_mmap+0x13d/0x4d0 mm/mmap.c:3087
 __mmput+0x27/0x1b0 kernel/fork.c:1185
 mmput+0x3d/0x50 kernel/fork.c:1207
 exit_mm+0xdb/0x170 kernel/exit.c:516
 do_exit+0x541/0x1740 kernel/exit.c:807
 do_group_exit+0xfe/0x140 kernel/exit.c:950
 get_signal+0xb40/0xc60 kernel/signal.c:2858
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:299

read to 0xffff888237c27ee0 of 1 bytes by task 22138 on cpu 1:
 pagevec_count include/linux/pagevec.h:51 [inline]
 need_mlock_page_drain+0x2c/0x50 mm/mlock.c:236
 cpu_needs_drain mm/swap.c:822 [inline]
 __lru_add_drain_all+0x24e/0x3c0 mm/swap.c:910
 lru_add_drain_all+0xc/0x10 mm/swap.c:926
 invalidate_bdev+0x56/0x80 block/bdev.c:86
 invalidate_disk+0x25/0xb0 block/genhd.c:680
 __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+0x20e/0x440 block/ioctl.c:614
 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: 0x09 -> 0x05

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22138 Comm: syz-executor.4 Not tainted 6.1.0-rc1-syzkaller-00093-g6d36c728bc2e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
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