syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000048: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000240-0x0000000000000247]
CPU: 1 UID: 0 PID: 121 Comm: jfsCommit Tainted: G        W           6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
RIP: 0010:do_raw_spin_lock+0x78/0x290 kernel/locking/spinlock_debug.c:115
Code: aa 9c 81 48 8d 4c 24 20 48 c1 e9 03 48 b8 f1 f1 f1 f1 04 f3 f3 f3 48 89 4c 24 18 4a 89 04 39 4c 8d 77 04 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 9f 01 00 00 41 8b 06 3d ad 4e ad de 0f
RSP: 0018:ffffc9000396fa60 EFLAGS: 00010007
RAX: 0000000000000048 RBX: 0000000000000240 RCX: 1ffff9200072df50
RDX: 0000000000000000 RSI: ffffffff8b620b60 RDI: 0000000000000240
RBP: ffffc9000396fb10 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3a787 R12: dffffc0000000000
R13: ffffc9000396fc08 R14: 0000000000000244 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2487dc000 CR3: 00000000414ba000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0xb3/0xf0 kernel/locking/spinlock.c:162
 rtlock_slowlock kernel/locking/rtmutex.c:1894 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x144/0x2c0 kernel/locking/spinlock_rt.c:57
 spin_lock_irq include/linux/spinlock_rt.h:93 [inline]
 txLazyCommit fs/jfs/jfs_txnmgr.c:2668 [inline]
 jfs_lazycommit+0x457/0xa10 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
RIP: 0010:do_raw_spin_lock+0x78/0x290 kernel/locking/spinlock_debug.c:115
Code: aa 9c 81 48 8d 4c 24 20 48 c1 e9 03 48 b8 f1 f1 f1 f1 04 f3 f3 f3 48 89 4c 24 18 4a 89 04 39 4c 8d 77 04 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 9f 01 00 00 41 8b 06 3d ad 4e ad de 0f
RSP: 0018:ffffc9000396fa60 EFLAGS: 00010007
RAX: 0000000000000048 RBX: 0000000000000240 RCX: 1ffff9200072df50
RDX: 0000000000000000 RSI: ffffffff8b620b60 RDI: 0000000000000240
RBP: ffffc9000396fb10 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3a787 R12: dffffc0000000000
R13: ffffc9000396fc08 R14: 0000000000000244 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2487dc000 CR3: 00000000414ba000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	aa                   	stos   %al,%es:(%rdi)
   1:	9c                   	pushf
   2:	81 48 8d 4c 24 20 48 	orl    $0x4820244c,-0x73(%rax)
   9:	c1 e9 03             	shr    $0x3,%ecx
   c:	48 b8 f1 f1 f1 f1 04 	movabs $0xf3f3f304f1f1f1f1,%rax
  13:	f3 f3 f3
  16:	48 89 4c 24 18       	mov    %rcx,0x18(%rsp)
  1b:	4a 89 04 39          	mov    %rax,(%rcx,%r15,1)
  1f:	4c 8d 77 04          	lea    0x4(%rdi),%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 9f 01 00 00    	jne    0x1d6
  37:	41 8b 06             	mov    (%r14),%eax
  3a:	3d ad 4e ad de       	cmp    $0xdead4ead,%eax
  3f:	0f                   	.byte 0xf