WARNING in dbJoin

Status: upstream: reported C repro on 2026/06/22 11:30
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+010b2394798a3b65f77b@syzkaller.appspotmail.com
First crash: 49d, last: 6h34m
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2026/07/07 upstream (ToT) 0e35b9b6ec0f C [report] WARNING in dbJoin
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in dbJoin origin:upstream -1 syz, C 18 5d12h 49d 0/3 upstream: reported C repro on 2026/06/21 14:20
upstream WARNING in dbJoin prio:high jfs -1 syz, C error 1619 5h31m 54d 0/29 upstream: reported C repro on 2026/06/16 17:32
linux-6.1 WARNING in dbJoin -1 syz, C 390 4h09m 50d 0/3 upstream: reported C repro on 2026/06/20 14:28

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 112 at fs/jfs/jfs_dmap.c:2875 dbAdjTree fs/jfs/jfs_dmap.c:2875 [inline]
WARNING: CPU: 0 PID: 112 at fs/jfs/jfs_dmap.c:2875 dbJoin+0xc17/0xd40 fs/jfs/jfs_dmap.c:2843
Modules linked in:
CPU: 0 PID: 112 Comm: jfsCommit Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:dbAdjTree fs/jfs/jfs_dmap.c:2875 [inline]
RIP: 0010:dbJoin+0xc17/0xd40 fs/jfs/jfs_dmap.c:2843
Code: ff e8 fd 85 83 fe eb 0c e8 f6 85 83 fe eb 05 e8 ef 85 83 fe 31 c0 48 83 c4 68 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 d9 85 83 fe <0f> 0b eb e6 44 89 e9 80 e1 07 38 c1 0f 8c 1d f4 ff ff 4c 89 ef e8
RSP: 0018:ffffc90002cf7690 EFLAGS: 00010293
RAX: ffffffff83035f77 RBX: 0000000000000155 RCX: ffff888018fd8000
RDX: 0000000000000000 RSI: 0000000000000155 RDI: 0000000000020056
RBP: 0000000000000004 R08: ffffea0001dfd287 R09: 1ffffd40003bfa50
R10: dffffc0000000000 R11: fffff940003bfa51 R12: dffffc0000000000
R13: ffff888077f4a020 R14: 0000000000020056 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0100f70000 CR3: 0000000026ab5000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 dbFreeBits+0x49f/0xd60 fs/jfs/jfs_dmap.c:2340
 dbFreeDmap fs/jfs/jfs_dmap.c:2089 [inline]
 dbFree+0x320/0x640 fs/jfs/jfs_dmap.c:398
 txFreeMap+0x9e6/0xde0 fs/jfs/jfs_txnmgr.c:2516
 xtTruncate+0xd15/0x2e90 fs/jfs/jfs_xtree.c:2467
 jfs_free_zero_link+0x35c/0x4c0 fs/jfs/namei.c:758
 jfs_evict_inode+0x350/0x430 fs/jfs/inode.c:159
 evict+0x4b7/0x8a0 fs/inode.c:705
 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline]
 jfs_lazycommit+0x439/0xaa0 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/22 13:59 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan WARNING in dbJoin
2026/08/10 06:22 linux-6.6.y d27334b2888c 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in dbJoin
2026/07/11 20:23 linux-6.6.y da47cbc25466 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in dbJoin
2026/06/29 08:02 linux-6.6.y d1cfde2d5d15 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in dbJoin
2026/06/23 01:32 linux-6.6.y d1cfde2d5d15 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in dbJoin
2026/06/22 11:29 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in dbJoin
* Struck through repros no longer work on HEAD.