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m_show+0x28/0x34\n   seq_read_iter+0x12c/0x3c4\n   vfs_read+0x29c/0x2c8\n   ksys_read+0x80/0xec\n   __arm64_sys_read+0x28/0x34\n   invoke_syscall+0x50/0xf8\n   do_el0_svc+0x88/0x138\n   el0_svc+0x2c/0x8c\n   el0t_64_sync_handler+0x84/0xe4\n   el0t_64_sync+0x198/0x19c\n\nReason:\nWhile btrfs_prepare_sprout() moves the fs_devices::devices into\nfs_devices::seed_list, the btrfs_show_devname() searches for the devices\nand found none, leading to the warning as in above.\n\nFix:\nlatest_dev is updated according to the changes to the device list.\nThat means we could use the latest_dev->name to show the device name in\n/proc/self/mounts, the pointer will be always valid as it's assigned\nbefore the device is deleted from the list in remove or replace.\nThe RCU protection is sufficient as the device structure is freed 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