[syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    66a27abac311 Merge tag 'powerpc-6.9-1' of git://git.kernel..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=147b32a5180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=48bb382b96e7eda7
dashboard link: https://syzkaller.appspot.com/bug?extid=eb83fe1cce5833cd66a0
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12598006180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=105d8aa5180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/37968fa0451e/disk-66a27aba.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5b288c5c3088/vmlinux-66a27aba.xz
kernel image: https://storage.googleapis.com/syzbot-assets/792ddbf8146d/bzImage-66a27aba.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+eb83fe1cce5833cd66a0@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in fscache_relinquish_cookie include/linux/fscache.h:307 [inline]
BUG: KMSAN: uninit-value in v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356
 fscache_relinquish_cookie include/linux/fscache.h:307 [inline]
 v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356
 evict+0x3ae/0xa60 fs/inode.c:667
 iput_final fs/inode.c:1741 [inline]
 iput+0x9ca/0xe10 fs/inode.c:1767
 iget_failed+0x15e/0x180 fs/bad_inode.c:248
 v9fs_fid_iget_dotl+0x375/0x570 fs/9p/vfs_inode_dotl.c:96
 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline]
 v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa7/0x570 fs/super.c:1779
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 do_syscall_64+0xd5/0x1f0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

Uninit was created at:
 __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2175 [inline]
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0x2de/0x1400 mm/slub.c:2391
 ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmem_cache_alloc_lru+0x6d7/0xbe0 mm/slub.c:3864
 alloc_inode_sb include/linux/fs.h:3089 [inline]
 v9fs_alloc_inode+0x62/0x130 fs/9p/vfs_inode.c:228
 alloc_inode+0x86/0x460 fs/inode.c:261
 iget_locked+0x2bf/0xee0 fs/inode.c:1280
 v9fs_fid_iget_dotl+0x7f/0x570 fs/9p/vfs_inode_dotl.c:62
 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline]
 v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa7/0x570 fs/super.c:1779
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 do_syscall_64+0xd5/0x1f0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

CPU: 1 PID: 5014 Comm: syz-executor406 Not tainted 6.8.0-syzkaller-11136-g66a27abac311 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[Charalampos Mitrodimas]

please test uv in v9fs_evict_inode

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 360a5304ec03..5d046f63e5fa 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -353,7 +353,8 @@ void v9fs_evict_inode(struct inode *inode)
 	filemap_fdatawrite(&inode->i_data);

 #ifdef CONFIG_9P_FSCACHE
-	fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
+	if (v9fs_inode_cookie(v9inode))
+		fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
 #endif
 }

Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file fs/9p/vfs_inode.c
patch: **** unexpected end of file in patch



Tested on:

commit:         bf3a69c6 Merge tag 'for-linus-6.9-ofs1' of git://git.k..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
kernel config:  https://syzkaller.appspot.com/x/.config?x=48bb382b96e7eda7
dashboard link: https://syzkaller.appspot.com/bug?extid=eb83fe1cce5833cd66a0
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=160cdef1180000

Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[Charalampos Mitrodimas]

please test uv in v9fs_evict_inode

#syz test 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 360a5304ec03..5d046f63e5fa 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -353,7 +353,8 @@ void v9fs_evict_inode(struct inode *inode)
      filemap_fdatawrite(&inode->i_data);

  #ifdef CONFIG_9P_FSCACHE
-    fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
+    if (v9fs_inode_cookie(v9inode))
+        fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
  #endif
  }

Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file fs/9p/vfs_inode.c
patch: **** unexpected end of file in patch



Tested on:

commit:         b3603fcb Merge tag 'dlm-6.9' of git://git.kernel.org/p..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=48bb382b96e7eda7
dashboard link: https://syzkaller.appspot.com/bug?extid=eb83fe1cce5833cd66a0
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13a5fe81180000

Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[Charalampos Mitrodimas]

please test uv in v9fs_evict_inode

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 360a5304ec03..5d046f63e5fa 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -353,7 +353,8 @@ void v9fs_evict_inode(struct inode *inode)
 	filemap_fdatawrite(&inode->i_data);
 
 #ifdef CONFIG_9P_FSCACHE
-	fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
+	if (v9fs_inode_cookie(v9inode))
+		fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
 #endif
 }
 

Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in v9fs_evict_inode

=====================================================
BUG: KMSAN: uninit-value in v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356
 v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356
 evict+0x3ae/0xa60 fs/inode.c:667
 iput_final fs/inode.c:1741 [inline]
 iput+0x9ca/0xe10 fs/inode.c:1767
 iget_failed+0x15e/0x180 fs/bad_inode.c:248
 v9fs_fid_iget_dotl+0x375/0x570 fs/9p/vfs_inode_dotl.c:96
 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline]
 v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa7/0x570 fs/super.c:1797
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 do_syscall_64+0xd5/0x1f0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

Uninit was created at:
 __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2175 [inline]
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0x2de/0x1400 mm/slub.c:2391
 ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmem_cache_alloc_lru+0x6d7/0xbe0 mm/slub.c:3864
 alloc_inode_sb include/linux/fs.h:3089 [inline]
 v9fs_alloc_inode+0x62/0x130 fs/9p/vfs_inode.c:228
 alloc_inode+0x86/0x460 fs/inode.c:261
 iget_locked+0x2bf/0xee0 fs/inode.c:1280
 v9fs_fid_iget_dotl+0x7f/0x570 fs/9p/vfs_inode_dotl.c:62
 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline]
 v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142
 legacy_get_tree+0x114/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa7/0x570 fs/super.c:1797
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 do_syscall_64+0xd5/0x1f0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

CPU: 1 PID: 5499 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-11567-gb3603fcb79b1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
=====================================================


Tested on:

commit:         b3603fcb Merge tag 'dlm-6.9' of git://git.kernel.org/p..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=175f8006180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d08e4cfe8c38e605
dashboard link: https://syzkaller.appspot.com/bug?extid=eb83fe1cce5833cd66a0
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1250b481180000

Re: [syzbot] Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode
Author: eric.vanhensbergen@linux.dev

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs.git b4/fix-evict-uninitialized-value

March 16, 2024 at 6:15 AM, "syzbot" <syzbot+eb83fe1cce5833cd66a0@syzkaller.appspotmail.com> wrote:
> 
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit: 66a27abac311 Merge tag 'powerpc-6.9-1' of git://git.kernel..
> 
> git tree: upstream
> 
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=147b32a5180000
> 
> kernel config: https://syzkaller.appspot.com/x/.config?x=48bb382b96e7eda7
> 
> dashboard link: https://syzkaller.appspot.com/bug?extid=eb83fe1cce5833cd66a0
> 
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> 
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12598006180000
> 
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105d8aa5180000
> 
> Downloadable assets:
> 
> disk image: https://storage.googleapis.com/syzbot-assets/37968fa0451e/disk-66a27aba.raw.xz
> 
> vmlinux: https://storage.googleapis.com/syzbot-assets/5b288c5c3088/vmlinux-66a27aba.xz
> 
> kernel image: https://storage.googleapis.com/syzbot-assets/792ddbf8146d/bzImage-66a27aba.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> 
> Reported-by: syzbot+eb83fe1cce5833cd66a0@syzkaller.appspotmail.com
> 
> =====================================================
> 
> BUG: KMSAN: uninit-value in fscache_relinquish_cookie include/linux/fscache.h:307 [inline]
> 
> BUG: KMSAN: uninit-value in v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356
> 
>  fscache_relinquish_cookie include/linux/fscache.h:307 [inline]
> 
>  v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356
> 
>  evict+0x3ae/0xa60 fs/inode.c:667
> 
>  iput_final fs/inode.c:1741 [inline]
> 
>  iput+0x9ca/0xe10 fs/inode.c:1767
> 
>  iget_failed+0x15e/0x180 fs/bad_inode.c:248
> 
>  v9fs_fid_iget_dotl+0x375/0x570 fs/9p/vfs_inode_dotl.c:96
> 
>  v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline]
> 
>  v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142
> 
>  legacy_get_tree+0x114/0x290 fs/fs_context.c:662
> 
>  vfs_get_tree+0xa7/0x570 fs/super.c:1779
> 
>  do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
> 
>  path_mount+0x742/0x1f20 fs/namespace.c:3679
> 
>  do_mount fs/namespace.c:3692 [inline]
> 
>  __do_sys_mount fs/namespace.c:3898 [inline]
> 
>  __se_sys_mount+0x725/0x810 fs/namespace.c:3875
> 
>  __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
> 
>  do_syscall_64+0xd5/0x1f0
> 
>  entry_SYSCALL_64_after_hwframe+0x6d/0x75
> 
> Uninit was created at:
> 
>  __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
> 
>  __alloc_pages_node include/linux/gfp.h:238 [inline]
> 
>  alloc_pages_node include/linux/gfp.h:261 [inline]
> 
>  alloc_slab_page mm/slub.c:2175 [inline]
> 
>  allocate_slab mm/slub.c:2338 [inline]
> 
>  new_slab+0x2de/0x1400 mm/slub.c:2391
> 
>  ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525
> 
>  __slab_alloc mm/slub.c:3610 [inline]
> 
>  __slab_alloc_node mm/slub.c:3663 [inline]
> 
>  slab_alloc_node mm/slub.c:3835 [inline]
> 
>  kmem_cache_alloc_lru+0x6d7/0xbe0 mm/slub.c:3864
> 
>  alloc_inode_sb include/linux/fs.h:3089 [inline]
> 
>  v9fs_alloc_inode+0x62/0x130 fs/9p/vfs_inode.c:228
> 
>  alloc_inode+0x86/0x460 fs/inode.c:261
> 
>  iget_locked+0x2bf/0xee0 fs/inode.c:1280
> 
>  v9fs_fid_iget_dotl+0x7f/0x570 fs/9p/vfs_inode_dotl.c:62
> 
>  v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline]
> 
>  v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142
> 
>  legacy_get_tree+0x114/0x290 fs/fs_context.c:662
> 
>  vfs_get_tree+0xa7/0x570 fs/super.c:1779
> 
>  do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
> 
>  path_mount+0x742/0x1f20 fs/namespace.c:3679
> 
>  do_mount fs/namespace.c:3692 [inline]
> 
>  __do_sys_mount fs/namespace.c:3898 [inline]
> 
>  __se_sys_mount+0x725/0x810 fs/namespace.c:3875
> 
>  __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
> 
>  do_syscall_64+0xd5/0x1f0
> 
>  entry_SYSCALL_64_after_hwframe+0x6d/0x75
> 
> CPU: 1 PID: 5014 Comm: syz-executor406 Not tainted 6.8.0-syzkaller-11136-g66a27abac311 #0
> 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
> 
> =====================================================
> 
> ---
> 
> This report is generated by a bot. It may contain errors.
> 
> See https://goo.gl/tpsmEJ for more information about syzbot.
> 
> syzbot engineers can be reached at syzkaller@googlegroups.com.
> 
> syzbot will keep track of this issue. See:
> 
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 
> If the report is already addressed, let syzbot know by replying with:
> 
> #syz fix: exact-commit-title
> 
> If you want syzbot to run the reproducer, reply with:
> 
> #syz test: git://repo/address.git branch-or-commit-hash
> 
> If you attach or paste a git patch, syzbot will apply it before testing.
> 
> If you want to overwrite report's subsystems, reply with:
> 
> #syz set subsystems: new-subsystem
> 
> (See the list of subsystem names on the web dashboard)
> 
> If the report is a duplicate of another one, reply with:
> 
> #syz dup: exact-subject-of-another-report
> 
> If you want to undo deduplication, reply with:
> 
> #syz undup
>

Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

can't ssh into the instance



failed to run ["ssh" "-p" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "root@10.128.1.150" "pwd"]: exit status 255
ssh: connect to host 10.128.1.150 port 22: Connection timed out
Pseudo-terminal will not be allocated because stdin is not a terminal.
Warning: Permanently added '[us-central1-ssh-serialport.googleapis.com]:9600' (RSA) to the list of known hosts.
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000200000000 = 8192 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 98244c28-997c-d970-fe51-cafe56332c7d
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f27c0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
[    0.000000][    T0] Linux version 6.8.0-rc1-syzkaller-00012-g22ffa13a3c01 (syzkaller@syzkaller) (Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40) #0 SMP PREEMPT_DYNAMIC now
[    0.000000][    T0] Command line: BOOT_IMAGE=/boot/bzImage root=/dev/sda1 console=ttyS0
[    0.000000][    T0] KERNEL supported cpus:
[    0.000000][    T0]   Intel GenuineIntel
[    0.000000][    T0]   AMD AuthenticAMD
[    0.000000][    T0] BIOS-provided physical RAM map:
[    0.000000][    T0] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000][    T0] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000][    T0] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000][    T0] BIOS-e820: [mem 0x0000000000100000-0x00000000bfffcfff] usable
[    0.000000][    T0] BIOS-e820: [mem 0x00000000bfffd000-0x00000000bfffffff] reserved
[    0.000000][    T0] BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] reserved
[    0.000000][    T0] BIOS-e820: [mem 0x0000000100000000-0x000000023fffffff] usable
[    0.000000][    T0] printk: legacy bootconsole [earlyser0] enabled
[    0.000000][    T0] ERROR: earlyprintk= earlyser already used
[    0.000000][    T0] ERROR: earlyprintk= earlyser already used
[    0.000000][    T0] **********************************************************
[    0.000000][    T0] **   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **
[    0.000000][    T0] **                                                      **
[    0.000000][    T0] ** This system shows unhashed kernel memory addresses   **
[    0.000000][    T0] ** via the console, logs, and other interfaces. This    **
[    0.000000][    T0] ** might reduce the security of your system.            **
[    0.000000][    T0] **                                                      **
[    0.000000][    T0] ** If you see this message and you are not debugging    **
[    0.000000][    T0] ** the kernel, report this immediately to your system   **
[    0.000000][    T0] ** administrator!                                       **
[    0.000000][    T0] **                                                      **
[    0.000000][    T0] **   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **
[    0.000000][    T0] **********************************************************
[    0.000000][    T0] Malformed early option 'vsyscall'
[    0.000000][    T0] nopcid: PCID feature disabled
[    0.000000][    T0] NX (Execute Disable) protection: active
[    0.000000][    T0] APIC: serialport: Connected to syzkaller.us-central1-c.ci-upstream-kmsan-gce-root-test-job-parallel-2 port 1 (session ID: e82a3602d26a155e10b97c8dc3c12b799a7d6f28c67e66690b6dd1b4d8c33ae3, active connections: 1).
Static calls initialized
[    0.000000][    T0] SMBIOS 2.4 present.
[    0.000000][    T0] DMI: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[    0.000000][    T0] Hypervisor detected: KVM
[    0.000000][    T0] kvm-clock: Using msrs 4b564d01 and 4b564d00
[    0.000006][    T0] kvm-clock: using sched offset of 5937164965 cycles
[    0.001237][    T0] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
[    0.004814][    T0] tsc: Detected 2200.220 MHz processor
[    0.014663][    T0] last_pfn = 0x240000 max_arch_pfn = 0x400000000
[    0.015844][    T0] MTRR map: 4 entries (3 fixed + 1 variable; max 19), built from 8 variable MTRRs
[    0.017132][    T0] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT  
[    0.018305][    T0] last_pfn = 0xbfffd max_arch_pfn = 0x400000000
[    0.026836][    T0] found SMP MP-table at [mem 0x000f2a80-0x000f2a8f]
[    0.027980][    T0] Using GB pages for direct mapping
[    0.033174][    T0] ACPI: Early table checksum verification disabled
[    0.034898][    T0] ACPI: RSDP 0x00000000000F2800 000014 (v00 Google)
[    0.036101][    T0] ACPI: RSDT 0x00000000BFFFFFA0 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001)
[    0.037818][    T0] ACPI: FACP 0x00000000BFFFF330 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001)
[    0.040688][    T0] ACPI: DSDT 0x00000000BFFFD8C0 001A64 (v01 Google GOOGDSDT 00000001 GOOG 00000001)
[    0.042664][    T0] ACPI: FACS 0x00000000BFFFD880 000040
[    0.043578][    T0] ACPI: FACS 0x00000000BFFFD880 000040
[    0.044351][    T0] ACPI: SRAT 0x00000000BFFFFE60 0000C8 (v03 Google GOOGSRAT 00000001 GOOG 00000001)
[    0.046684][    T0] ACPI: APIC 0x00000000BFFFFDB0 000076 (v05 Google GOOGAPIC 00000001 GOOG 00000001)
[    0.048111][    T0] ACPI: SSDT 0x00000000BFFFF430 000980 (v01 Google GOOGSSDT 00000001 GOOG 00000001)
[    0.049684][    T0] ACPI: WAET 0x00000000BFFFFE30 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001)
[    0.051316][    T0] ACPI: Reserving FACP table memory at [mem 0xbffff330-0xbffff423]
[    0.052796][    T0] ACPI: Reserving DSDT table memory at [mem 0xbfffd8c0-0xbffff323]
[    0.054251][    T0] ACPI: Reserving FACS table memory at [mem 0xbfffd880-0xbfffd8bf]
[    0.057326][    T0] ACPI: Reserving FACS table memory at [mem 0xbfffd880-0xbfffd8bf]
[    0.058824][    T0] ACPI: Reserving SRAT table memory at [mem 0xbffffe60-0xbfffff27]
[    0.060203][    T0] ACPI: Reserving APIC table memory at [mem 0xbffffdb0-0xbffffe25]
[    0.061415][    T0] ACPI: Reserving SSDT table memory at [mem 0xbffff430-0xbffffdaf]
[    0.062677][    T0] ACPI: Reserving WAET table memory at [mem 0xbffffe30-0xbffffe57]
[    0.064154][    T0] SRAT: PXM 0 -> APIC 0x00 -> Node 0
[    0.065317][    T0] SRAT: PXM 0 -> APIC 0x01 -> Node 0
[    0.066315][    T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0009ffff]
[    0.067376][    T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x00100000-0xbfffffff]
[    0.068405][    T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x23fffffff]
[    0.069822][    T0] NUMA: Node 0 [mem 0x00000000-0x0009ffff] + [mem 0x00100000-0xbfffffff] -> [mem 0x00000000-0xbfffffff]
[    0.072881][    T0] NUMA: Node 0 [mem 0x00000000-0xbfffffff] + [mem 0x100000000-0x23fffffff] -> [mem 0x00000000-0x23fffffff]
[    0.074935][    T0] Faking node 0 at [mem 0x0000000000000000-0x000000013fffffff] (5120MB)
[    0.076263][    T0] Faking node 1 at [mem 0x0000000140000000-0x000000023fffffff] (4096MB)
[    0.078438][    T0] NODE_DATA(0) allocated [mem 0x13fffa000-0x13fffffff]
[    0.080018][    T0] NODE_DATA(1) allocated [mem 0x23fff7000-0x23fffcfff]
[    0.104240][    T0] Zone ranges:
[    0.104983][    T0]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.106799][    T0]   DMA32    [mem 0x0000000001000000-0x00000000ffffffff]
[    0.107775][    T0]   Normal   [mem 0x0000000100000000-0x000000023fffffff]
[    0.109311][    T0]   Device   empty
[    0.109927][    T0] Movable zone start for each node
[    0.111401][    T0] Early memory node ranges
[    0.112665][    T0]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.113948][    T0]   node   0: [mem 0x0000000000100000-0x00000000bfffcfff]
[    0.115931][    T0]   node   0: [mem 0x0000000100000000-0x000000013fffffff]
[    0.117551][    T0]   node   1: [mem 0x0000000140000000-0x000000023fffffff]
[    0.118915][    T0] Initmem setup node 0 [mem 0x0000000000001000-0x000000013fffffff]
[    0.120744][    T0] Initmem setup node 1 [mem 0x0000000140000000-0x000000023fffffff]
[    0.122511][    T0] On node 0, zone DMA: 1 pages in unavailable ranges
[    0.124062][    T0] On node 0, zone DMA: 97 pages in unavailable ranges
[    0.255653][    T0] On node 0, zone Normal: 3 pages in unavailable ranges
[    0.389510][    T0] ACPI: PM-Timer IO Port: 0xb008
[    0.390772][    T0] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.391910][    T0] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.393482][    T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[    0.394556][    T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.395755][    T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[    0.396841][    T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[    0.398015][    T0] ACPI: Using ACPI (MADT) for SMP configuration information
[    0.399103][    T0] smpboot: Allowing 2 CPUs, 0 hotplug CPUs
[    0.400346][    T0] PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.401793][    T0] PM: hibernation: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
[    0.402955][    T0] PM: hibernation: Registered nosave memory: [mem 0x000a0000-0x000effff]
[    0.404185][    T0] PM: hibernation: Registered nosave memory: [mem 0x000f0000-0x000fffff]
[    0.406414][    T0] PM: hibernation: Registered nosave memory: [mem 0xbfffd000-0xbfffffff]
[    0.407862][    T0] PM: hibernation: Registered nosave memory: [mem 0xc0000000-0xfffbbfff]
[    0.409210][    T0] PM: hibernation: Registered nosave memory: [mem 0xfffbc000-0xffffffff]
[    0.410396][    T0] [mem 0xc0000000-0xfffbbfff] available for PCI devices
[    0.411464][    T0] Booting paravirtualized kernel on KVM
[    0.412453][    T0] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.414424][    T0] setup_percpu: NR_CPUS:8 nr_cpumask_bits:2 nr_cpu_ids:2 nr_node_ids:2
[    0.416586][    T0] percpu: Embedded 176 pages/cpu s683016 r8192 d29688 u1048576
[    0.418172][    T0] Kernel command line: earlyprintk=serial net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1 ima_policy=tcb nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 binder.debug_mask=0 rcupdate.rcu_expedited=1 rcupdate.rcu_cpu_stall_cputime=1 no_hash_pointers page_owner=on sysctl.vm.nr_hugepages=4 sysctl.vm.nr_overcommit_hugepages=4 secretmem.enable=1 sysctl.max_rcu_stall_to_panic=1 msr.allow_writes=off coredump_filter=0xffff root=/dev/sda console=ttyS0 vsyscall=native numa=fake=2 kvm-intel.nested=1 spec_store_bypass_disable=prctl nopcid vivid.n_devs=16 vivid.multiplanar=1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2 netrom.nr_ndevs=16 rose.rose_ndevs=16 smp.csd_lock_timeout=100000 watchdog_thresh=55 workqueue.watchdog_thresh=140 sysctl.net.core.netdev_unregister_timeout_secs=140 dummy_hcd.num=8 kmsan.panic=1 BOOT_IMAGE=/boot/bzImage root=/dev/sda1 console=ttyS0
[    0.438759][    T0] Unknown kernel command line parameters "page_owner=on spec_store_bypass_disable=prctl watchdog_thresh=55 BOOT_IMAGE=/boot/bzImage", will be passed to user space.
[    0.441672][    T0] random: crng init done
[    0.442824][    T0] Fallback order for Node 0: 0 1 
[    0.442869][    T0] Fallback order for Node 1: 1 0 
[    0.442885][    T0] Built 2 zonelists, mobility grouping on.  Total pages: 2055933
[    0.445747][    T0] Policy zone: Normal
[    0.446410][    T0] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.746915][    T0] stackdepot: allocating hash table via alloc_large_system_hash
[    0.748679][    T0] stackdepot hash table entries: 524288 (order: 11, 8388608 bytes, linear)
[    0.753267][    T0] software IO TLB: area num 2.
[    0.852827][    T0] Memory: 2290736K/8388204K available (237568K kernel code, 9701K rwdata, 18212K rodata, 36392K init, 2524K bss, 1508228K reserved, 0K cma-reserved)
[    0.857739][    T0] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=2
[    0.859241][    T0] Kernel/User page tables isolation: enabled
[    0.860598][    T0] Starting KernelMemorySanitizer
[    0.861422][    T0] ATTENTION: KMSAN is a debugging tool! Do not use it on production machines!


syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build716133879=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at d615901c7
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d615901c739a765329b688494cee2f8e1b5037cb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240314-145638'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d615901c739a765329b688494cee2f8e1b5037cb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240314-145638'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d615901c739a765329b688494cee2f8e1b5037cb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240314-145638'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d615901c739a765329b688494cee2f8e1b5037cb\"



Tested on:

commit:         22ffa13a fs/9p: fix uninitialized values during inode ..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs.git b4/fix-evict-uninitialized-value
kernel config:  https://syzkaller.appspot.com/x/.config?x=fdd94870bd281651
dashboard link: https://syzkaller.appspot.com/bug?extid=eb83fe1cce5833cd66a0
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.