module strangeness with lsmod

[Per Kristian Gjermshus]

If lsmod encounters a deleted module it will fail. lsmod calls
query_module with QM_MODULES to get a list of the modules, it then
uses query_module with QM_INFO for each of the modules found. The
input to QM_INFO is checked with find_module and find_module fails if
the module is deleted. Deleted modules are returned in the QM_MODULES
call.

It might be that the-snd-card-trident module in the example below
should not have been marked as deleted, but the logic for QM_MODULES
and QM_INFO must be flawed anyway.

I have only seen this behavior with 2.3.43, but the code is identical
in older kernels as well.

[root@chrome ~]# lsmod
Module                  Size  Used by
snd-synth-trident       7000   0  (autoclean) (unused)
lsmod: QM_INFO: No such file or directory
[root@chrome ~]# cat /proc/modules 
snd-synth-trident       7000   0 (autoclean) (unused)
snd-card-trident        2744   0 (deleted)
snd-trident            15604   0 (autoclean) [snd-synth-trident snd-card-trident]
snd-ac97-codec         22432   0 (autoclean) [snd-trident]
snd-mpu401-uart         1944   0 (autoclean) [snd-card-trident snd-trident]
snd-seq-oss            30232   0 (unused)
snd-ainstr-iw           4856   0 (unused)
snd-ainstr-gf1          2776   0 (unused)
snd-ainstr-simple       1564   0 [snd-synth-trident]
snd-seq-instr           4824   0 [snd-synth-trident]
snd-seq-midi-emul       4468   0 [snd-synth-trident]
snd-seq-midi            3772   0 (unused)
snd-seq-midi-event      2764   0 [snd-seq-oss snd-seq-midi]
snd-seq                45268   0 [snd-synth-trident snd-seq-oss snd-seq-instr snd-seq-midi snd-seq-midi-event]
snd-hwdep               3340   0 (unused)
snd-rawmidi            11480   0 [snd-mpu401-uart snd-seq-midi]
snd-seq-device          5112   0 [snd-synth-trident snd-trident snd-seq-oss snd-seq-midi snd-seq snd-rawmidi]
snd-pcm-oss            18192   0
snd-pcm-plugin         14952   0 [snd-pcm-oss]
snd-pcm                32184   0 [snd-trident snd-pcm-oss snd-pcm-plugin]
snd-timer               9824   0 [snd-seq snd-pcm]
snd-mixer-oss           4436   0 [snd-pcm-oss]
snd-mixer              25168   0 [snd-trident snd-ac97-codec snd-mixer-oss]
snd                    41952   1 [snd-synth-trident snd-card-trident snd-trident snd-ac97-codec snd-mpu401-uart snd-seq-oss snd-ainstr-iw snd-ainstr-gf1 snd-seq-instr snd-seq-midi-emul snd-seq-midi snd-seq-midi-event snd-seq snd-hwdep snd-rawmidi snd-seq-device snd-pcm-oss snd-pcm-plugin snd-pcm snd-timer snd-mixer-oss snd-mixer]
[root@chrome ~]# strace lsmod
execve("/sbin/lsmod", ["lsmod"], [/* 26 vars */]) = 0
brk(0)                                  = 0x804a0d8
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=33537, ...}) = 0
mmap(0, 33537, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40013000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
fstat(3, {st_mode=S_IFREG|0755, st_size=4118299, ...}) = 0
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\250\202"..., 4096) = 4096
mmap(0, 993500, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4001c000
mprotect(0x40107000, 30940, PROT_NONE)  = 0
mmap(0x40107000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xea000) = 0x40107000
mmap(0x4010b000, 14556, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4010b000
close(3)                                = 0
mprotect(0x4001c000, 962560, PROT_READ|PROT_WRITE) = 0
mprotect(0x4001c000, 962560, PROT_READ|PROT_EXEC) = 0
munmap(0x40013000, 33537)               = 0
personality(0 /* PER_??? */)            = 0
getpid()                                = 22637
brk(0)                                  = 0x804a0d8
brk(0x804a278)                          = 0x804a278
brk(0x804b000)                          = 0x804b000
query_module(NULL, 0, NULL, 0)          = 0
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 3), ...}) = 0
mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40013000
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
write(1, "Module                  Size  Us"..., 38Module                  Size  Used by
) = 38
query_module(NULL, QM_MODULES, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 0xbffffb2c) = 0
query_module("snd-synth-trident", QM_INFO, "\314\213\4\10\0\0\0\0\0\0\0\0\0\0\0\0", 0xbffffb2c) = 0
query_module("snd-synth-trident", QM_REFS, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 0xbffffb2c) = 0
write(1, "snd-synth-trident       7000   0"..., 55snd-synth-trident       7000   0  (autoclean) (unused)
) = 55
query_module("snd-card-trident", QM_INFO, "\0\300\210\310X\33\0\0\5\0\0\0\0\0\0\0", 0xbffffb2c) = -1 ENOENT (No such file or directory)
write(2, "lsmod: ", 7lsmod: )                  = 7
write(2, "QM_INFO: No such file or directo"..., 34QM_INFO: No such file or directory) = 34
write(2, "\n", 1
)                       = 1
munmap(0x40013000, 4096)                = 0
_exit(1)                             

                                                   Per Kristian