loop5: detected capacity change from 0 to 8 ================================================================== BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lrus_cpu write to 0xffff888237c26da0 of 8 bytes by task 1373 on cpu 0: __invalidate_bh_lrus fs/buffer.c:1418 [inline] invalidate_bh_lrus_cpu+0xad/0xe0 fs/buffer.c:1459 lru_add_drain_cpu+0x243/0x270 mm/swap.c:645 lru_add_drain mm/swap.c:724 [inline] __pagevec_release+0x57/0xa0 mm/swap.c:989 pagevec_release include/linux/pagevec.h:81 [inline] truncate_inode_pages_range+0x20d/0xa80 mm/truncate.c:332 truncate_inode_pages+0x20/0x30 mm/truncate.c:427 kill_bdev fs/block_dev.c:86 [inline] set_blocksize+0x24e/0x270 fs/block_dev.c:166 sb_set_blocksize+0x2c/0xa0 fs/block_dev.c:175 fat_fill_super+0x12fe/0x2a80 fs/fat/inode.c:1680 vfat_fill_super+0x2c/0x40 fs/fat/namei_vfat.c:1051 mount_bdev+0x1e8/0x290 fs/super.c:1368 vfat_mount+0x2d/0x40 fs/fat/namei_vfat.c:1058 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x11d4/0x1ce0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888237c26da0 of 8 bytes by task 1357 on cpu 1: has_bh_in_lru+0x31/0x1c0 fs/buffer.c:1440 smp_call_function_many_cond+0x226/0x620 kernel/smp.c:915 on_each_cpu_cond_mask+0x31/0x40 kernel/smp.c:1133 on_each_cpu_cond include/linux/smp.h:97 [inline] invalidate_bh_lrus+0x26/0x30 fs/buffer.c:1449 kill_bdev fs/block_dev.c:85 [inline] set_blocksize+0x242/0x270 fs/block_dev.c:166 sb_set_blocksize+0x2c/0xa0 fs/block_dev.c:175 fat_fill_super+0x12fe/0x2a80 fs/fat/inode.c:1680 vfat_fill_super+0x2c/0x40 fs/fat/namei_vfat.c:1051 mount_bdev+0x1e8/0x290 fs/super.c:1368 vfat_mount+0x2d/0x40 fs/fat/namei_vfat.c:1058 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x11d4/0x1ce0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1357 Comm: syz-executor.5 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop5): bogus number of directory entries (110) FAT-fs (loop5): Can't find a valid FAT filesystem