Bug#959425: loopback command hangs in 2.04 under UEFI

Sun May 3 15:01:55 BST 2020

Dear Maintainer,
I further tried to get some more logging output by "set debug=all".

There I found that the loopback command actually returns after
around 2 minutes for my 335 MB ISO file.
>From the logging is looks like the whole ISO is read
to memory, if the tpm module is loaded.
If it is not loaded the ISO seems to get not touched at all.

Is it "just" checking if the file is signed?
(Even when running without secureboot?)

Kind regards,
Bernhard
-------------- next part --------------
13:42:00
13:44:03
~123 seconds

#serial --speed=115200 efi0
terminal_input console serial_efi0
terminal_output gfxterm serial_efi0

set debug=all
#set pager=1
date; loopback loop /debian-10.3.0-amd64-netinst.iso; date

###########

# With module tpm loaded:

grub> set debug=all
script/script.c:65: free 0xbbc4fdc0
script/script.c:65: free 0xbbc4fe00
script/script.c:65: free 0xbbc4fe40
script/script.c:65: free 0xbbc4f960
script/script.c:65: free 0xbbc4f9c0
script/script.c:65: free 0xbbc4fa00
script/script.c:65: free 0xbbc4fa60
script/script.c:65: free 0xbbc4fac0
script/script.c:65: free 0xbbc4fba0
script/script.c:65: free 0xbbc4fc80
script/script.c:65: free 0xbbc4fce0
script/script.c:65: free 0xbbc4fd20
grub> date; loopback loop /debian-10.3.0-amd64-netinst.iso; date
script/lexer.c:321: token 288 text [date]
script/script.c:50: malloc 0xbbc4fb40
script/script.c:50: malloc 0xbbc4fb00
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4faa0
script/lexer.c:321: token 265 text [;]
script/script.c:50: malloc 0xbbc4fa40
script/script.c:50: malloc 0xbbc4fa00
script/script.c:198: cmdline
script/script.c:50: malloc 0xbbc4f9a0
script/lexer.c:321: token 288 text [loopback]
script/script.c:50: malloc 0xbbc4f940
script/script.c:50: malloc 0xbbc4f900
script/script.c:294: append command
script/script.c:50: malloc 0xbbc4f8c0
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f860
script/lexer.c:321: token 288 text [loop]
script/script.c:50: malloc 0xbbc4f800
script/script.c:50: malloc 0xbbc4f7c0
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f760
script/lexer.c:321: token 289 text [/debian-10.3.0-amd64-netinst.iso]
script/script.c:50: malloc 0xbbc4f4c0
script/script.c:50: malloc 0xbbc4f460
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f400
script/lexer.c:321: token 265 text [;]
script/script.c:50: malloc 0xbbc4f3a0
script/script.c:50: malloc 0xbbc4f360
script/script.c:198: cmdline
script/script.c:50: malloc 0xbbc4f300
script/lexer.c:321: token 288 text [date]
script/script.c:50: malloc 0xbbc4f2a0
script/script.c:50: malloc 0xbbc4f260
script/script.c:294: append command
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f200
script/lexer.c:321: token 259 text [
]
script/script.c:50: malloc 0xbbc4f1a0
script/script.c:50: malloc 0xbbc4f160
script/script.c:198: cmdline
script/script.c:50: malloc 0xbbc4f100
script/lexer.c:321: token 0 text []
script/script.c:50: malloc 0xbbc4fca0
script/script.c:50: malloc 0xbbc4fc60
script/script.c:294: append command
kern/disk.c:196: Opening `hd0,gpt2'...
disk/efi/efidisk.c:482: opening hd0
disk/efi/efidisk.c:511: m = 0xbef1d300, last block = 27fffff, block size = 200,
io align = 8
disk/efi/efidisk.c:531: opening hd0 succeeded
partmap/gpt.c:90: Read a valid GPT header
partmap/gpt.c:112: GPT entry 0: start=2048, length=1048576
partmap/gpt.c:112: GPT entry 1: start=1050624, length=36704256
kern/fs.c:56: Detecting procfs...
kern/fs.c:78: procfs detection failed.
kern/fs.c:56: Detecting zfs...
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x100900 from hd0
fs/zfs/zfs.c:1192: label ok 0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x100800 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x100840 from hd0
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x100b00 from hd0
fs/zfs/zfs.c:1192: label ok 1
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x100a00 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x100a40 from hd0
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x2400500 from hd0
fs/zfs/zfs.c:1192: label ok 2
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x2400400 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x2400440 from hd0
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x2400700 from hd0
fs/zfs/zfs.c:1192: label ok 3
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x2400600 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x2400640 from hd0
kern/fs.c:78: zfs detection failed.
kern/fs.c:56: Detecting xfs...
fs/xfs.c:907: Reading sb
fs/xfs.c:257: Validating superblock
kern/fs.c:78: xfs detection failed.
kern/fs.c:56: Detecting squash4...
kern/fs.c:78: squash4 detection failed.
kern/fs.c:56: Detecting ntfs...
kern/fs.c:78: ntfs detection failed.
kern/fs.c:56: Detecting jfs...
kern/fs.c:78: jfs detection failed.
kern/fs.c:56: Detecting iso9660...
kern/fs.c:78: iso9660 detection failed.
kern/fs.c:56: Detecting hfsplus...
kern/fs.c:78: hfsplus detection failed.
kern/fs.c:56: Detecting f2fs...
kern/fs.c:78: f2fs detection failed.
kern/fs.c:56: Detecting fat...
kern/fs.c:78: fat detection failed.
kern/fs.c:56: Detecting ext2...
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x102900 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x112980 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x500900 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x510980 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x501d00 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x510ac0 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x510c00 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x500940 from hd0
commands/verifiers.c:88: file: (hd0,gpt2)/boot/grub/x86_64-efi/date.mod type:
1
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1985880 from hd0
kern/disk.c:295: Closing `hd0'.
disk/efi/efidisk.c:540: closing hd0
kern/dl.c:605: module at 0xbbac3720, size 0xc88
kern/dl.c:630: relocating to 0xbbad6ce0
kern/dl.c:559: flushing 0x907 bytes at 0xbbad62e0
kern/dl.c:653: module name: date
kern/dl.c:654: init function: 0xbbad6598
2020-05-03 12:03:01 Sonntag
commands/wildcard.c:509: no expansion needed
commands/wildcard.c:568: paths[0] = `/debian-10.3.0-amd64-netinst.iso'
kern/disk.c:196: Opening `hd0,gpt2'...
disk/efi/efidisk.c:482: opening hd0
disk/efi/efidisk.c:511: m = 0xbef1d300, last block = 27fffff, block size = 200,
io align = 8
disk/efi/efidisk.c:531: opening hd0 succeeded
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x0 from hd0
partmap/gpt.c:90: Read a valid GPT header
partmap/gpt.c:112: GPT entry 0: start=2048, length=1048576
partmap/gpt.c:112: GPT entry 1: start=1050624, length=36704256
kern/fs.c:56: Detecting procfs...
kern/fs.c:78: procfs detection failed.
kern/fs.c:56: Detecting zfs...
fs/zfs/zfs.c:1192: label ok 0
fs/zfs/zfs.c:1192: label ok 1
fs/zfs/zfs.c:1192: label ok 2
fs/zfs/zfs.c:1192: label ok 3
kern/fs.c:78: zfs detection failed.
kern/fs.c:56: Detecting xfs...
fs/xfs.c:907: Reading sb
fs/xfs.c:257: Validating superblock
kern/fs.c:78: xfs detection failed.
kern/fs.c:56: Detecting squash4...
kern/fs.c:78: squash4 detection failed.
kern/fs.c:56: Detecting ntfs...
kern/fs.c:78: ntfs detection failed.
kern/fs.c:56: Detecting jfs...
kern/fs.c:78: jfs detection failed.
kern/fs.c:56: Detecting iso9660...
kern/fs.c:78: iso9660 detection failed.
kern/fs.c:56: Detecting hfsplus...
kern/fs.c:78: hfsplus detection failed.
kern/fs.c:56: Detecting f2fs...
kern/fs.c:78: f2fs detection failed.
kern/fs.c:56: Detecting fat...
kern/fs.c:78: fat detection failed.
kern/fs.c:56: Detecting ext2...
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1500900 from hd0
commands/verifiers.c:88: file: /debian-10.3.0-amd64-netinst.iso type: 131074
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c4800 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c4840 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c4880 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c48c0 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c4900 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c4940 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c4980 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c49c0 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x19c4a00 from hd0
...
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bc40 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bc80 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bcc0 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bd00 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bd40 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bd80 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bdc0 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6be00 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6be40 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6be80 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bec0 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bf00 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bf40 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bf80 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1a6bfc0 from hd0
2020-05-03 12:05:53 Sonntag
script/script.c:65: free 0xbbc4fc60
script/script.c:65: free 0xbbc4fca0
script/script.c:65: free 0xbbc4f100
script/script.c:65: free 0xbbc4f160
script/script.c:65: free 0xbbc4f1a0
script/script.c:65: free 0xbbc4f200
script/script.c:65: free 0xbbc4f260
script/script.c:65: free 0xbbc4f2a0
script/script.c:65: free 0xbbc4f300
script/script.c:65: free 0xbbc4f360
script/script.c:65: free 0xbbc4f3a0
script/script.c:65: free 0xbbc4f400
script/script.c:65: free 0xbbc4f460
script/script.c:65: free 0xbbc4f4c0
script/script.c:65: free 0xbbc4f760
script/script.c:65: free 0xbbc4f7c0
script/script.c:65: free 0xbbc4f800
script/script.c:65: free 0xbbc4f860
script/script.c:65: free 0xbbc4f8c0
script/script.c:65: free 0xbbc4f900
script/script.c:65: free 0xbbc4f940
script/script.c:65: free 0xbbc4f9a0
script/script.c:65: free 0xbbc4fa00
script/script.c:65: free 0xbbc4fa40
script/script.c:65: free 0xbbc4faa0
script/script.c:65: free 0xbbc4fb00
script/script.c:65: free 0xbbc4fb40
grub> 

-> ~2 minutes, 52 seconds

0x1a6bfc0 + 0x40 - 0x19c4800 = 0xA7800 = 686080; *512 = 351272960 bytes?

###########

grub> rmmod tpm
grub> set debug=all
script/script.c:65: free 0xbbc4fdc0
script/script.c:65: free 0xbbc4fe00
script/script.c:65: free 0xbbc4fe40
script/script.c:65: free 0xbbc4f960
script/script.c:65: free 0xbbc4f9c0
script/script.c:65: free 0xbbc4fa00
script/script.c:65: free 0xbbc4fa60
script/script.c:65: free 0xbbc4fac0
script/script.c:65: free 0xbbc4fba0
script/script.c:65: free 0xbbc4fc80
script/script.c:65: free 0xbbc4fce0
script/script.c:65: free 0xbbc4fd20
grub> date; loopback loop /debian-1.3.0-amd64-netinst.iso; date
script/lexer.c:321: token 288 text [date]
script/script.c:50: malloc 0xbbc4fc00
script/script.c:50: malloc 0xbbc4fbc0
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4fb60
script/lexer.c:321: token 265 text [;]
script/script.c:50: malloc 0xbbc4fb00
script/script.c:50: malloc 0xbbc4fac0
script/script.c:198: cmdline
script/script.c:50: malloc 0xbbc4fa60
script/lexer.c:321: token 288 text [loopback]
script/script.c:50: malloc 0xbbc4fa00
script/script.c:50: malloc 0xbbc4f9c0
script/script.c:294: append command
script/script.c:50: malloc 0xbbc4f980
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f920
script/lexer.c:321: token 288 text [loop]
script/script.c:50: malloc 0xbbc4f8c0
script/script.c:50: malloc 0xbbc4f880
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f820
script/lexer.c:321: token 289 text [/debian-1.3.0-amd64-netinst.iso]
script/script.c:50: malloc 0xbbc4f580
script/script.c:50: malloc 0xbbc4f520
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f4c0
script/lexer.c:321: token 265 text [;]
script/script.c:50: malloc 0xbbc4f460
script/script.c:50: malloc 0xbbc4f420
script/script.c:198: cmdline
script/script.c:50: malloc 0xbbc4f3c0
script/lexer.c:321: token 288 text [date]
script/script.c:50: malloc 0xbbc4f360
script/script.c:50: malloc 0xbbc4f320
script/script.c:294: append command
script/script.c:163: arglist
script/script.c:50: malloc 0xbbc4f2c0
script/lexer.c:321: token 259 text [
]
script/script.c:50: malloc 0xbbc4f260
script/script.c:50: malloc 0xbbc4f220
script/script.c:198: cmdline
script/script.c:50: malloc 0xbbc4f1c0
script/lexer.c:321: token 0 text []
script/script.c:50: malloc 0xbbc4fd60
script/script.c:50: malloc 0xbbc4fd20
script/script.c:294: append command
kern/disk.c:196: Opening `hd0,gpt2'...
disk/efi/efidisk.c:482: opening hd0
disk/efi/efidisk.c:511: m = 0xbef1d300, last block = 27fffff, block size = 200,
io align = 8
disk/efi/efidisk.c:531: opening hd0 succeeded
partmap/gpt.c:90: Read a valid GPT header
partmap/gpt.c:112: GPT entry 0: start=2048, length=1048576
partmap/gpt.c:112: GPT entry 1: start=1050624, length=36704256
kern/fs.c:56: Detecting procfs...
kern/fs.c:78: procfs detection failed.
kern/fs.c:56: Detecting zfs...
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x100900 from hd0
fs/zfs/zfs.c:1192: label ok 0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x100800 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x100840 from hd0
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x100b00 from hd0
fs/zfs/zfs.c:1192: label ok 1
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x100a00 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x100a40 from hd0
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x2400500 from hd0
fs/zfs/zfs.c:1192: label ok 2
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x2400400 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x2400440 from hd0
disk/efi/efidisk.c:593: reading 0x100 sectors at the sector 0x2400700 from hd0
fs/zfs/zfs.c:1192: label ok 3
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x2400600 from hd0
disk/efi/efidisk.c:593: reading 0xc0 sectors at the sector 0x2400640 from hd0
kern/fs.c:78: zfs detection failed.
kern/fs.c:56: Detecting xfs...
fs/xfs.c:907: Reading sb
fs/xfs.c:257: Validating superblock
kern/fs.c:78: xfs detection failed.
kern/fs.c:56: Detecting squash4...
kern/fs.c:78: squash4 detection failed.
kern/fs.c:56: Detecting ntfs...
kern/fs.c:78: ntfs detection failed.
kern/fs.c:56: Detecting jfs...
kern/fs.c:78: jfs detection failed.
kern/fs.c:56: Detecting iso9660...
kern/fs.c:78: iso9660 detection failed.
kern/fs.c:56: Detecting hfsplus...
kern/fs.c:78: hfsplus detection failed.
kern/fs.c:56: Detecting f2fs...
kern/fs.c:78: f2fs detection failed.
kern/fs.c:56: Detecting fat...
kern/fs.c:78: fat detection failed.
kern/fs.c:56: Detecting ext2...
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x102900 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x112980 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x500900 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x510980 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x501d00 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x510ac0 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x510c00 from hd0
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x500940 from hd0
commands/verifiers.c:88: file: (hd0,gpt2)/boot/grub/x86_64-efi/date.mod type:
1
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x1985880 from hd0
kern/disk.c:295: Closing `hd0'.
disk/efi/efidisk.c:540: closing hd0
kern/dl.c:605: module at 0xbbad6040, size 0xc88
kern/dl.c:630: relocating to 0xbbc51d40
kern/dl.c:559: flushing 0x907 bytes at 0xbbc51340
kern/dl.c:653: module name: date
kern/dl.c:654: init function: 0xbbc515f8
2020-05-03 12:47:06 Sonntag
commands/wildcard.c:509: no expansion needed
commands/wildcard.c:568: paths[0] = `/debian-1.3.0-amd64-netinst.iso'
kern/disk.c:196: Opening `hd0,gpt2'...
disk/efi/efidisk.c:482: opening hd0
disk/efi/efidisk.c:511: m = 0xbef1d300, last block = 27fffff, block size = 200,
io align = 8
disk/efi/efidisk.c:531: opening hd0 succeeded
disk/efi/efidisk.c:593: reading 0x40 sectors at the sector 0x0 from hd0
partmap/gpt.c:90: Read a valid GPT header
partmap/gpt.c:112: GPT entry 0: start=2048, length=1048576
partmap/gpt.c:112: GPT entry 1: start=1050624, length=36704256
kern/fs.c:56: Detecting procfs...
kern/fs.c:78: procfs detection failed.
kern/fs.c:56: Detecting zfs...
fs/zfs/zfs.c:1192: label ok 0
fs/zfs/zfs.c:1192: label ok 1
fs/zfs/zfs.c:1192: label ok 2
fs/zfs/zfs.c:1192: label ok 3
kern/fs.c:78: zfs detection failed.
kern/fs.c:56: Detecting xfs...
fs/xfs.c:907: Reading sb
fs/xfs.c:257: Validating superblock
kern/fs.c:78: xfs detection failed.
kern/fs.c:56: Detecting squash4...
kern/fs.c:78: squash4 detection failed.
kern/fs.c:56: Detecting ntfs...
kern/fs.c:78: ntfs detection failed.
kern/fs.c:56: Detecting jfs...
kern/fs.c:78: jfs detection failed.
kern/fs.c:56: Detecting iso9660...
kern/fs.c:78: iso9660 detection failed.
kern/fs.c:56: Detecting hfsplus...
kern/fs.c:78: hfsplus detection failed.
kern/fs.c:56: Detecting f2fs...
kern/fs.c:78: f2fs detection failed.
kern/fs.c:56: Detecting fat...
kern/fs.c:78: fat detection failed.
kern/fs.c:56: Detecting ext2...
kern/disk.c:295: Closing `hd0'.
disk/efi/efidisk.c:540: closing hd0
2020-05-03 12:47:06 Sonntag
script/script.c:65: free 0xbbc4fd20
script/script.c:65: free 0xbbc4fd60
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