[syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap

[syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    691d401c7e0e Merge tag 'spi-fix-v6.18-rc3' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1698c292580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=4d0a0feb49c5138cac46
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=150b5704580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15d75fe2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d338706bec79/disk-691d401c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d3ac35c22ff8/vmlinux-691d401c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d8d6c3e88136/bzImage-691d401c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/47c6a6500cd9/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=166ee32f980000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4d0a0feb49c5138cac46@syzkaller.appspotmail.com

list_add corruption. next is NULL.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:28!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 122 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__list_add_valid_or_report+0xc3/0x130 lib/list_debug.c:27
Code: 4c 89 f2 48 89 d9 e8 0c 88 a4 fc 90 0f 0b 48 c7 c7 20 de 3d 8b e8 fd 87 a4 fc 90 0f 0b 48 c7 c7 c0 de 3d 8b e8 ee 87 a4 fc 90 <0f> 0b 48 89 df e8 13 c3 7d fd 42 80 7c 2d 00 00 74 08 4c 89 e7 e8
RSP: 0018:ffffc9000395fa20 EFLAGS: 00010246
RAX: 0000000000000022 RBX: 0000000000000000 RCX: 270c5dfadb559700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f0000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200072bee9 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000004 R15: 1ffff92000632266
FS:  0000000000000000(0000) GS:ffff888126ef9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056341fdb86c0 CR3: 0000000040a18000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add include/linux/list.h:177 [inline]
 dbUpdatePMap+0x7e4/0xeb0 fs/jfs/jfs_dmap.c:577
 txAllocPMap+0x57d/0x6b0 fs/jfs/jfs_txnmgr.c:2426
 txUpdateMap+0x81e/0x9c0 fs/jfs/jfs_txnmgr.c:2364
 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline]
 jfs_lazycommit+0x3f1/0xa10 fs/jfs/jfs_txnmgr.c:2734
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xc3/0x130 lib/list_debug.c:27
Code: 4c 89 f2 48 89 d9 e8 0c 88 a4 fc 90 0f 0b 48 c7 c7 20 de 3d 8b e8 fd 87 a4 fc 90 0f 0b 48 c7 c7 c0 de 3d 8b e8 ee 87 a4 fc 90 <0f> 0b 48 89 df e8 13 c3 7d fd 42 80 7c 2d 00 00 74 08 4c 89 e7 e8
RSP: 0018:ffffc9000395fa20 EFLAGS: 00010246
RAX: 0000000000000022 RBX: 0000000000000000 RCX: 270c5dfadb559700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f0000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200072bee9 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000004 R15: 1ffff92000632266
FS:  0000000000000000(0000) GS:ffff888126ef9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056341fdb86c0 CR3: 0000000040a18000 CR4: 00000000003526f0


---
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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:
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#syz undup

Forwarded: Re: [syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap

[syzbot]

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

***

Subject: Re: [syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap
Author: yun.zhou@windriver.com

#syz test

diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 871cf4fb3636..0d6c40e7e551 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -270,6 +270,7 @@ static inline struct metapage *alloc_metapage(gfp_t
gfp_mask)
                  mp->clsn = 0;
                  mp->log = NULL;
                  init_waitqueue_head(&mp->wait);
+               INIT_LIST_HEAD(&mp->synclist);
          }
          return mp;
   }
@@ -379,7 +380,7 @@ static void remove_from_logsync(struct metapage *mp)
                  mp->lsn = 0;
                  mp->clsn = 0;
                  log->count--;
-               list_del(&mp->synclist);
+               list_del_init(&mp->synclist);
          }
          LOGSYNC_UNLOCK(log, flags);
   }
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index 7840a03e5bcb..a5a5bc0a266d 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -275,6 +275,7 @@ int txInit(void)
          for (k = 0; k < nTxBlock; k++) {
                  init_waitqueue_head(&TxBlock[k].gcwait);
                  init_waitqueue_head(&TxBlock[k].waitor);
+               INIT_LIST_HEAD(&TxBlock[k].synclist);
          }

          for (k = 1; k < nTxBlock - 1; k++) {
@@ -974,7 +975,7 @@ static void txUnlock(struct tblock * tblk)
          if (tblk->lsn) {
                  LOGSYNC_LOCK(log, flags);
                  log->count--;
-               list_del(&tblk->synclist);
+               list_del_init(&tblk->synclist);
                  LOGSYNC_UNLOCK(log, flags);
          }
   }

Forwarded: Re: [syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap

[syzbot]

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

***

Subject: Re: [syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap
Author: yun.zhou@windriver.com

#syz test

Re: [syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap

[syzbot]

Hello,

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

failed to apply patch:
checking file fs/jfs/jfs_metapage.c
patch: **** malformed patch at line 6: diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c




Tested on:

commit:         4a0c9b33 Merge tag 'probes-fixes-v6.18-rc4' of git://g..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=4d0a0feb49c5138cac46
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=153f2a58580000

Re: [syzbot] [jfs?] BUG: corrupted list in dbUpdatePMap

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+4d0a0feb49c5138cac46@syzkaller.appspotmail.com
Tested-by: syzbot+4d0a0feb49c5138cac46@syzkaller.appspotmail.com

Tested on:

commit:         4a0c9b33 Merge tag 'probes-fixes-v6.18-rc4' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12f0aa58580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=4d0a0feb49c5138cac46
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11015342580000

Note: testing is done by a robot and is best-effort only.