是否有人遇到过一些问题（可能是 debian dist-upgrade），所有 .gz 文件不再被识别为 gzip 格式？
今天早上，我们的一台服务器的数据库出现了问题；在检查了我们有两种备份（virtualmin 虚拟服务器完整备份和数据库备份）后，决定将 mysql 与 debian 发行版一起升级。
升级后，我们注意到没有任何 .gz 文件被识别为 gzip 格式。
file alldbbackups.sql.gz
alldbbackups.sql.gz: data
将它们显示为纯数据文件。
尝试过 gziprecover，但没有成功。
strace gunzip alldatabases06062020.sql.gz
execve("/bin/gunzip", ["gunzip", "alldatabases06062020.sql.gz"], [/* 29 vars */]) = 0
brk(NULL) = 0x56429a9d4000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=57364, ...}) = 0
mmap(NULL, 57364, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f8e8843d000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\4\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1689360, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8e8843b000
mmap(NULL, 3795296, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8e87e8a000
mprotect(0x7f8e8801f000, 2097152, PROT_NONE) = 0
mmap(0x7f8e8821f000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x195000) = 0x7f8e8821f000
mmap(0x7f8e88225000, 14688, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f8e88225000
close(3) = 0
arch_prctl(ARCH_SET_FS, 0x7f8e8843c480) = 0
mprotect(0x7f8e8821f000, 16384, PROT_READ) = 0
mprotect(0x564298faf000, 8192, PROT_READ) = 0
mprotect(0x7f8e8844c000, 4096, PROT_READ) = 0
munmap(0x7f8e8843d000, 57364) = 0
getpid() = 3171
rt_sigaction(SIGCHLD, {sa_handler=0x564298da5ef0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER, sa_restorer=0x7f8e87ebd060}, NULL, 8) = 0
geteuid() = 0
brk(NULL) = 0x56429a9d4000
brk(0x56429a9f5000) = 0x56429a9f5000
getppid() = 3169
stat("/home/bckDB/bck", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/bin/gunzip", O_RDONLY) = 3
fcntl(3, F_DUPFD, 10) = 10
close(3) = 0
fcntl(10, F_SETFD, FD_CLOEXEC) = 0
rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x564298da5ef0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER, sa_restorer=0x7f8e87ebd060}, NULL, 8) = 0
rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER, sa_restorer=0x7f8e87ebd060}, NULL, 8) = 0
rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER, sa_restorer=0x7f8e87ebd060}, NULL, 8) = 0
read(10, "#!/bin/sh\n# Uncompress files. T"..., 8192) = 2301
execve("/bin/gzip", ["gzip", "-d", "alldatabases06062020.sql.gz"], [/* 29 vars */]) = 0
brk(NULL) = 0x5641bfe32000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=57364, ...}) = 0
mmap(NULL, 57364, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f832e5de000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\4\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1689360, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f832e5dc000
mmap(NULL, 3795296, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f832e02b000
mprotect(0x7f832e1c0000, 2097152, PROT_NONE) = 0
mmap(0x7f832e3c0000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x195000) = 0x7f832e3c0000
mmap(0x7f832e3c6000, 14688, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f832e3c6000
close(3) = 0
arch_prctl(ARCH_SET_FS, 0x7f832e5dd4c0) = 0
mprotect(0x7f832e3c0000, 16384, PROT_READ) = 0
mprotect(0x5641bec5f000, 4096, PROT_READ) = 0
mprotect(0x7f832e5ed000, 4096, PROT_READ) = 0
munmap(0x7f832e5de000, 57364) = 0
rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXCPU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXFSZ, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x5641bea4c1c0, sa_mask=[HUP INT PIPE TERM XCPU XFSZ], sa_flags=SA_RESTORER, sa_restorer=0x7f832e05e060}, NULL, 8) = 0
rt_sigaction(SIGHUP, {sa_handler=0x5641bea4c1c0, sa_mask=[HUP INT PIPE TERM XCPU XFSZ], sa_flags=SA_RESTORER, sa_restorer=0x7f832e05e060}, NULL, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=0x5641bea4c1c0, sa_mask=[HUP INT PIPE TERM XCPU XFSZ], sa_flags=SA_RESTORER, sa_restorer=0x7f832e05e060}, NULL, 8) = 0
rt_sigaction(SIGTERM, {sa_handler=0x5641bea4c1c0, sa_mask=[HUP INT PIPE TERM XCPU XFSZ], sa_flags=SA_RESTORER, sa_restorer=0x7f832e05e060}, NULL, 8) = 0
rt_sigaction(SIGXCPU, {sa_handler=0x5641bea4c1c0, sa_mask=[HUP INT PIPE TERM XCPU XFSZ], sa_flags=SA_RESTORER, sa_restorer=0x7f832e05e060}, NULL, 8) = 0
rt_sigaction(SIGXFSZ, {sa_handler=0x5641bea4c1c0, sa_mask=[HUP INT PIPE TERM XCPU XFSZ], sa_flags=SA_RESTORER, sa_restorer=0x7f832e05e060}, NULL, 8) = 0
open("alldatabases06062020.sql.gz", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=219860290, ...}) = 0
read(3, "\320\215\325\331Q%,\261\10\237h\346UO\26\33\210\22\225\234\357\32\340\0v!=\373/t\220\2"..., 32768) = 32768
write(2, "\ngzip: alldatabases06062020.sql."..., 55
gzip: alldatabases06062020.sql.gz: not in gzip format
) = 55
close(3) = 0
lseek(0, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
close(0) = 0
close(1) = 0
close(2) = 0
exit_group(1) = ?
+++ exited with 1 +++
尝试使用上述方法 strace ，发出对以下内容的引用：
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
我不确定这是否与问题有关。即使尝试在不同的服务器上解压文件也不起作用。
在这个绝望的时刻，有人能给出一些暗示吗？