From: syzbot <syzbot+a099d674daa27a9272db@syzkaller.appspotmail.com>
To: kartikey406@gmail.com, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [jfs?] kernel BUG in dtSplitRoot
Date: Sat, 06 Dec 2025 21:42:02 -0800 [thread overview]
Message-ID: <693513aa.a70a0220.38f243.0046.GAE@google.com> (raw)
In-Reply-To: <20251207052119.2604297-1-kartikey406@gmail.com>
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in dbFree
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 104 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:dbFree+0xba/0x650 fs/jfs/jfs_dmap.c:352
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 de 34 e0 fe 48 8b 03 48 89 44 24 10 48 8b 44 24 20 48 8d 78 28 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 ba 34 e0 fe 48 8b 44 24 20 48 8b 58 28 48
RSP: 0018:ffffc900018a7a98 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff8880432eaea0 RCX: ffff88801c7ca4c0
RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000000028
RBP: 0000000000000001 R08: ffff88801c7ca4c0 R09: 0000000000000002
R10: 0000000000000040 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000022 R14: ffff888055b49fd0 R15: 1ffff1100ab693fa
FS: 0000000000000000(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f908a83f000 CR3: 0000000046fec000 CR4: 0000000000352ef0
Call Trace:
<TASK>
txFreeMap+0x7ff/0xde0 fs/jfs/jfs_txnmgr.c:2539
txUpdateMap+0x308/0x9c0 fs/jfs/jfs_txnmgr.c:-1
txLazyCommit fs/jfs/jfs_txnmgr.c:2669 [inline]
jfs_lazycommit+0x43f/0xa90 fs/jfs/jfs_txnmgr.c:2738
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFree+0xba/0x650 fs/jfs/jfs_dmap.c:352
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 de 34 e0 fe 48 8b 03 48 89 44 24 10 48 8b 44 24 20 48 8d 78 28 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 ba 34 e0 fe 48 8b 44 24 20 48 8b 58 28 48
RSP: 0018:ffffc900018a7a98 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff8880432eaea0 RCX: ffff88801c7ca4c0
RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000000028
RBP: 0000000000000001 R08: ffff88801c7ca4c0 R09: 0000000000000002
R10: 0000000000000040 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000022 R14: ffff888055b49fd0 R15: 1ffff1100ab693fa
FS: 0000000000000000(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa71adff000 CR3: 0000000047507000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
8: 74 08 je 0x12
a: 48 89 df mov %rbx,%rdi
d: e8 de 34 e0 fe call 0xfee034f0
12: 48 8b 03 mov (%rbx),%rax
15: 48 89 44 24 10 mov %rax,0x10(%rsp)
1a: 48 8b 44 24 20 mov 0x20(%rsp),%rax
1f: 48 8d 78 28 lea 0x28(%rax),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 05 je 0x36
31: e8 ba 34 e0 fe call 0xfee034f0
36: 48 8b 44 24 20 mov 0x20(%rsp),%rax
3b: 48 8b 58 28 mov 0x28(%rax),%rbx
3f: 48 rex.W
Tested on:
commit: 37bb2e72 Merge tag 'staging-6.19-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=162efc1a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1889d7812b50029c
dashboard link: https://syzkaller.appspot.com/bug?extid=a099d674daa27a9272db
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=1386221a580000
next parent reply other threads:[~2025-12-07 5:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20251207052119.2604297-1-kartikey406@gmail.com>
2025-12-07 5:42 ` syzbot [this message]
[not found] <20251207060531.2606558-1-kartikey406@gmail.com>
2025-12-07 6:23 ` syzbot
[not found] <20251207045701.2600605-1-kartikey406@gmail.com>
2025-12-07 5:14 ` syzbot
2025-12-06 8:38 syzbot
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