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From: "Lukáš Krejčí" <lskrejci@gmail.com>
To: Christian Couder <christian.couder@gmail.com>
Cc: git <git@vger.kernel.org>
Subject: Re: [BUG REPORT] Git does not correctly replay bisect log
Date: Tue, 04 Dec 2018 14:36:52 +0100	[thread overview]
Message-ID: <f79b421a8033d69f88547028629719ca2ba93615.camel@gmail.com> (raw)
In-Reply-To: <CAP8UFD3cD5KtvPJK5WkWGVUT6grbL=xL2MV1YWNJGpOjD3uRiQ@mail.gmail.com>

On Tue, 2018-12-04 at 13:01 +0100, Christian Couder wrote:
> To debug I think it would be interesting to see the output of the
> following commands just before we get different results:
> 
> git for-each-ref 'refs/bisect/*'
> 
> and
> 
> git log -1 --format=oneline
> 

I placed the following snippet at the end of the loop in bisect_replay():
echo "COMMAND: '$git' '$bisect' '$command' '$rev'"		
git for-each-ref 'refs/bisect/*'
echo "current HEAD: $(git log -1 --format=oneline)"
echo "---"

$ env GIT_TRACE=0 git bisect replay /var/tmp/git-bisect.log 

We are not bisecting.
COMMAND: 'git' 'bisect' 'start' ''
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'bad' '5b394b2ddf0347bef56e50c69a58773c94343ff3'
5b394b2ddf0347bef56e50c69a58773c94343ff3 commit refs/bisect/bad
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'good' '94710cac0ef4ee177a63b5227664b38c95bbf703'
5b394b2ddf0347bef56e50c69a58773c94343ff3 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'bad' '54dbe75bbf1e189982516de179147208e90b5e45'
54dbe75bbf1e189982516de179147208e90b5e45 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'bad' '0a957467c5fd46142bc9c52758ffc552d4c5e2f7'
0a957467c5fd46142bc9c52758ffc552d4c5e2f7 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'good' '958f338e96f874a0d29442396d6adf9c1e17aa2d'
0a957467c5fd46142bc9c52758ffc552d4c5e2f7 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'bad' '2c20443ec221dcb76484b30933593e8ecd836bbd'
2c20443ec221dcb76484b30933593e8ecd836bbd commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'bad' 'c2fc71c9b74c1e87336a27dba1a5edc69d2690f1'
c2fc71c9b74c1e87336a27dba1a5edc69d2690f1 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'bad' 'b86d865cb1cae1e61527ea0b8977078bbf694328'
b86d865cb1cae1e61527ea0b8977078bbf694328 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
COMMAND: 'git' 'bisect' 'bad' '1b0d274523df5ef1caedc834da055ff721e4d4f0'
1b0d274523df5ef1caedc834da055ff721e4d4f0 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
Bisecting: a merge base must be tested
[1e4b044d22517cae7047c99038abb444423243ca] Linux 4.18-rc4







# I placed git for-each-ref 'refs/bisect/*' after each command in the file:

$ . /var/tmp/git-bisect.log 
5b394b2ddf0347bef56e50c69a58773c94343ff3 commit refs/bisect/bad
Bisecting: 6112 revisions left to test after this (roughly 13 steps)
[54dbe75bbf1e189982516de179147208e90b5e45] Merge tag 'drm-next-2018-08-15' of git://anongit.freedesktop.org/drm/drm
5b394b2ddf0347bef56e50c69a58773c94343ff3 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
Bisecting: 3881 revisions left to test after this (roughly 12 steps)
[0a957467c5fd46142bc9c52758ffc552d4c5e2f7] x86: i8259: Add missing include file
54dbe75bbf1e189982516de179147208e90b5e45 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
Bisecting: 1595 revisions left to test after this (roughly 11 steps)
[958f338e96f874a0d29442396d6adf9c1e17aa2d] Merge branch 'l1tf-final' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
0a957467c5fd46142bc9c52758ffc552d4c5e2f7 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
Bisecting: 854 revisions left to test after this (roughly 10 steps)
[2c20443ec221dcb76484b30933593e8ecd836bbd] Merge tag 'acpi-4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
0a957467c5fd46142bc9c52758ffc552d4c5e2f7 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
Bisecting: 352 revisions left to test after this (roughly 9 steps)
[c2fc71c9b74c1e87336a27dba1a5edc69d2690f1] Merge tag 'mtd/for-4.19' of git://git.infradead.org/linux-mtd
2c20443ec221dcb76484b30933593e8ecd836bbd commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
Bisecting: 193 revisions left to test after this (roughly 8 steps)
[b86d865cb1cae1e61527ea0b8977078bbf694328] blkcg: Make blkg_root_lookup() work for queues in bypass mode
c2fc71c9b74c1e87336a27dba1a5edc69d2690f1 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
Bisecting: 97 revisions left to test after this (roughly 7 steps)
[1b0d274523df5ef1caedc834da055ff721e4d4f0] nvmet: don't use uuid_le type
b86d865cb1cae1e61527ea0b8977078bbf694328 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
Bisecting: 47 revisions left to test after this (roughly 6 steps)
[6dad38d38f20c0c8a84b5ae4f23c62b2c8758ec5] null_blk: move shared definitions to header file
1b0d274523df5ef1caedc834da055ff721e4d4f0 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d








Here is the output of the first command with GIT_TRACE on.

$ env GIT_TRACE=1 git bisect replay /var/tmp/git-bisect.log 
14:30:26.859355 git.c:659               trace: exec: git-bisect replay /var/tmp/git-bisect.log
14:30:26.859422 run-command.c:643       trace: run_command: git-bisect replay /var/tmp/git-bisect.log
14:30:26.893410 git.c:415               trace: built-in: git rev-parse --git-dir
14:30:26.898676 git.c:415               trace: built-in: git rev-parse --show-cdup
14:30:26.906487 git.c:415               trace: built-in: git rev-parse --git-path objects
We are not bisecting.
14:30:26.928736 git.c:415               trace: built-in: git rev-parse --sq-quote
14:30:26.935080 git.c:415               trace: built-in: git rev-parse --is-bare-repository
14:30:26.941601 git.c:415               trace: built-in: git symbolic-ref -q HEAD
14:30:26.949947 git.c:415               trace: built-in: git bisect--helper --bisect-clean-state
14:30:26.961001 git.c:415               trace: built-in: git rev-parse --sq-quote
14:30:26.970945 git.c:415               trace: built-in: git show-ref -q --verify refs/bisect/bad
14:30:26.979838 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/good-*'
COMMAND: 'git' 'bisect' 'start' ''
14:30:26.989878 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
14:30:26.997573 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.012658 git.c:415               trace: built-in: git bisect--helper --write-terms bad good
14:30:27.021663 git.c:415               trace: built-in: git update-ref refs/bisect/bad 5b394b2ddf0347bef56e50c69a58773c94343ff3
14:30:27.032023 git.c:415               trace: built-in: git show-branch 5b394b2ddf0347bef56e50c69a58773c94343ff3
COMMAND: 'git' 'bisect' 'bad' '5b394b2ddf0347bef56e50c69a58773c94343ff3'
14:30:27.045300 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
5b394b2ddf0347bef56e50c69a58773c94343ff3 commit refs/bisect/bad
14:30:27.055905 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.069302 git.c:415               trace: built-in: git update-ref refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703 94710cac0ef4ee177a63b5227664b38c95bbf703
14:30:27.080205 git.c:415               trace: built-in: git show-branch 94710cac0ef4ee177a63b5227664b38c95bbf703
COMMAND: 'git' 'bisect' 'good' '94710cac0ef4ee177a63b5227664b38c95bbf703'
14:30:27.091229 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
5b394b2ddf0347bef56e50c69a58773c94343ff3 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
14:30:27.101268 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.108474 git.c:415               trace: built-in: git update-ref refs/bisect/bad 54dbe75bbf1e189982516de179147208e90b5e45
14:30:27.117641 git.c:415               trace: built-in: git show-branch 54dbe75bbf1e189982516de179147208e90b5e45
COMMAND: 'git' 'bisect' 'bad' '54dbe75bbf1e189982516de179147208e90b5e45'
14:30:27.126344 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
54dbe75bbf1e189982516de179147208e90b5e45 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
14:30:27.135195 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.143550 git.c:415               trace: built-in: git update-ref refs/bisect/bad 0a957467c5fd46142bc9c52758ffc552d4c5e2f7
14:30:27.151005 git.c:415               trace: built-in: git show-branch 0a957467c5fd46142bc9c52758ffc552d4c5e2f7
COMMAND: 'git' 'bisect' 'bad' '0a957467c5fd46142bc9c52758ffc552d4c5e2f7'
14:30:27.157688 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
0a957467c5fd46142bc9c52758ffc552d4c5e2f7 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
14:30:27.163749 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.171138 git.c:415               trace: built-in: git update-ref refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d 958f338e96f874a0d29442396d6adf9c1e17aa2d
14:30:27.177118 git.c:415               trace: built-in: git show-branch 958f338e96f874a0d29442396d6adf9c1e17aa2d
COMMAND: 'git' 'bisect' 'good' '958f338e96f874a0d29442396d6adf9c1e17aa2d'
14:30:27.186531 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
0a957467c5fd46142bc9c52758ffc552d4c5e2f7 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
14:30:27.199439 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.210832 git.c:415               trace: built-in: git update-ref refs/bisect/bad 2c20443ec221dcb76484b30933593e8ecd836bbd
14:30:27.219812 git.c:415               trace: built-in: git show-branch 2c20443ec221dcb76484b30933593e8ecd836bbd
COMMAND: 'git' 'bisect' 'bad' '2c20443ec221dcb76484b30933593e8ecd836bbd'
14:30:27.228918 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
2c20443ec221dcb76484b30933593e8ecd836bbd commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
14:30:27.237583 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.246265 git.c:415               trace: built-in: git update-ref refs/bisect/bad c2fc71c9b74c1e87336a27dba1a5edc69d2690f1
14:30:27.257213 git.c:415               trace: built-in: git show-branch c2fc71c9b74c1e87336a27dba1a5edc69d2690f1
COMMAND: 'git' 'bisect' 'bad' 'c2fc71c9b74c1e87336a27dba1a5edc69d2690f1'
14:30:27.268181 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
c2fc71c9b74c1e87336a27dba1a5edc69d2690f1 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
14:30:27.279037 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.287349 git.c:415               trace: built-in: git update-ref refs/bisect/bad b86d865cb1cae1e61527ea0b8977078bbf694328
14:30:27.293680 git.c:415               trace: built-in: git show-branch b86d865cb1cae1e61527ea0b8977078bbf694328
COMMAND: 'git' 'bisect' 'bad' 'b86d865cb1cae1e61527ea0b8977078bbf694328'
14:30:27.301385 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
b86d865cb1cae1e61527ea0b8977078bbf694328 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
14:30:27.307179 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.312767 git.c:415               trace: built-in: git update-ref refs/bisect/bad 1b0d274523df5ef1caedc834da055ff721e4d4f0
14:30:27.318559 git.c:415               trace: built-in: git show-branch 1b0d274523df5ef1caedc834da055ff721e4d4f0
COMMAND: 'git' 'bisect' 'bad' '1b0d274523df5ef1caedc834da055ff721e4d4f0'
14:30:27.323911 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/*'
1b0d274523df5ef1caedc834da055ff721e4d4f0 commit refs/bisect/bad
94710cac0ef4ee177a63b5227664b38c95bbf703 commit refs/bisect/good-94710cac0ef4ee177a63b5227664b38c95bbf703
958f338e96f874a0d29442396d6adf9c1e17aa2d commit refs/bisect/good-958f338e96f874a0d29442396d6adf9c1e17aa2d
14:30:27.329725 git.c:415               trace: built-in: git log -1 --format=oneline
current HEAD: 2595646791c319cadfdbf271563aac97d0843dc7 Linux 4.20-rc5
---
14:30:27.332326 git.c:415               trace: built-in: git show-ref -q --verify refs/bisect/bad
14:30:27.342139 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/good-*'
14:30:27.348466 git.c:415               trace: built-in: git show-ref -q --verify refs/bisect/bad
14:30:27.355160 git.c:415               trace: built-in: git for-each-ref 'refs/bisect/good-*'
14:30:27.364281 git.c:415               trace: built-in: git bisect--helper --next-all
Bisecting: a merge base must be tested
14:30:27.491498 run-command.c:643       trace: run_command: git checkout -q 1e4b044d22517cae7047c99038abb444423243ca --
14:30:27.497822 git.c:415               trace: built-in: git checkout -q 1e4b044d22517cae7047c99038abb444423243ca --
14:30:55.290141 run-command.c:643       trace: run_command: git show-branch 1e4b044d22517cae7047c99038abb444423243ca
14:30:55.292168 git.c:415               trace: built-in: git show-branch 1e4b044d22517cae7047c99038abb444423243ca
[1e4b044d22517cae7047c99038abb444423243ca] Linux 4.18-rc4


  reply	other threads:[~2018-12-04 13:36 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-04  9:51 [BUG REPORT] Git does not correctly replay bisect log Lukáš Krejčí
2018-12-04 10:57 ` Lukáš Krejčí
2018-12-04 11:04 ` Christian Couder
2018-12-04 11:20   ` Lukáš Krejčí
2018-12-04 12:01     ` Christian Couder
2018-12-04 13:36       ` Lukáš Krejčí [this message]
2018-12-06 14:43       ` Lukáš Krejčí
2018-12-06 16:31         ` Christian Couder
2018-12-06 17:30           ` Lukáš Krejčí
2018-12-06 23:02             ` Christian Couder

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