Oops: general protection fault, probably for non-canonical address 0xdffffc000000014c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000a60-0x0000000000000a67]
CPU: 1 UID: 0 PID: 8367 Comm: syz.1.111 Tainted: G        W           6.16.0-syzkaller-11699-g7e161a991ea7 #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:199
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 6f db 08 cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc90003fef250 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffffffff8af89f1e RCX: d5db285f47f6c900
RDX: 0000000000000000 RSI: ffffffff8af89f1e RDI: 000000000000014c
RBP: ffffffff8af7ac0f R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1005473c71 R12: 0000000000000000
R13: 0000000000000a60 R14: 0000000000000a60 R15: 0000000000000001
FS:  00007f1ba735e6c0(0000) GS:ffff8881269cd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556cfc5c8 CR3: 0000000079b8a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __kasan_check_byte+0x12/0x40 mm/kasan/common.c:556
 kasan_check_byte include/linux/kasan.h:399 [inline]
 lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5842
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 task_blocks_on_rt_mutex kernel/locking/rtmutex.c:1265 [inline]
 rtlock_slowlock_locked+0x8ef/0x4010 kernel/locking/rtmutex.c:1851
 rtlock_slowlock kernel/locking/rtmutex.c:1895 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x152/0x2c0 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:44 [inline]
 spin_lock_irqsave_sdp_contention kernel/rcu/srcutree.c:380 [inline]
 srcu_gp_start_if_needed+0x463/0x10b0 kernel/rcu/srcutree.c:1277
 __call_srcu kernel/rcu/srcutree.c:1391 [inline]
 __synchronize_srcu+0x2fa/0x390 kernel/rcu/srcutree.c:1443
 bch2_fs_btree_iter_exit+0x3f9/0x490 fs/bcachefs/btree_iter.c:3750
 __bch2_fs_free fs/bcachefs/super.c:617 [inline]
 bch2_fs_release+0x2ab/0x830 fs/bcachefs/super.c:667
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22b/0x480 lib/kobject.c:737
 bch2_fs_get_tree+0xb6e/0x1520 fs/bcachefs/fs.c:2604
 vfs_get_tree+0x92/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
 do_mount fs/namespace.c:4133 [inline]
 __do_sys_mount fs/namespace.c:4344 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4321
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ba80e74ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1ba735de68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1ba735def0 RCX: 00007f1ba80e74ca
RDX: 0000000020000500 RSI: 0000000020005900 RDI: 00007f1ba735deb0
RBP: 0000000020000500 R08: 00007f1ba735def0 R09: 0000000001000000
R10: 0000000001000000 R11: 0000000000000246 R12: 0000000020005900
R13: 00007f1ba735deb0 R14: 0000000000005907 R15: 00000000200001c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:199
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 6f db 08 cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc90003fef250 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffffffff8af89f1e RCX: d5db285f47f6c900
RDX: 0000000000000000 RSI: ffffffff8af89f1e RDI: 000000000000014c
RBP: ffffffff8af7ac0f R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1005473c71 R12: 0000000000000000
R13: 0000000000000a60 R14: 0000000000000a60 R15: 0000000000000001
FS:  00007f1ba735e6c0(0000) GS:ffff8881269cd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556cfc5c8 CR3: 0000000079b8a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
   7:	00
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	66 0f 1f 00          	nopw   (%rax)
  1c:	48 c1 ef 03          	shr    $0x3,%rdi
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	0f b6 04 07          	movzbl (%rdi,%rax,1),%eax <-- trapping instruction
  2e:	3c 08                	cmp    $0x8,%al
  30:	0f 92 c0             	setb   %al
  33:	e9 40 6f db 08       	jmp    0x8db6f78
  38:	cc                   	int3
  39:	66                   	data16
  3a:	66                   	data16
  3b:	66                   	data16
  3c:	66                   	data16
  3d:	66                   	data16
  3e:	66                   	data16
  3f:	2e                   	cs