syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 0 UID: 0 PID: 384 Comm: syz.2.17 Not tainted syzkaller #0 99b3eabaa23ae162c27001e7be83a6c28a211609
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:fuse_file_release+0x29e/0x400 fs/fuse/file.c:388
Code: 00 74 12 48 89 df e8 c1 e5 a0 ff 48 ba 00 00 00 00 00 fc ff df 4c 89 2b 4c 8b 75 b8 49 81 c7 c8 00 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 74 e4 a0 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc9000102fae0 EFLAGS: 00010202
RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffff888114820000
RDX: dffffc0000000000 RSI: 0000000000000a06 RDI: ffff8881236c3778
RBP: ffffc9000102fb28 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000205f2c R12: 0000000000008000
R13: ffff88811320e400 R14: ffff8881236c3700 R15: 00000000000000c8
FS:  000055556d4ac500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c0c0a8e80 CR3: 000000011521e000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 fuse_release_common fs/fuse/file.c:393 [inline]
 fuse_release+0x13e/0x1b0 fs/fuse/file.c:408
 __fput+0x1fe/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e0/0x250 kernel/task_work.c:240
 get_signal+0x1307/0x14f0 kernel/signal.c:2706
 arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff7b498eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007ffee86ffd68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000803c RCX: 00007ff7b498eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ff7b4be7da0 R08: 0000000000000001 R09: 00000007e870005f
R10: 0000001b33320000 R11: 0000000000000246 R12: 00007ff7b4be609c
R13: 00007ff7b4be6090 R14: ffffffffffffffff R15: 00007ffee86ffe80
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fuse_file_release+0x29e/0x400 fs/fuse/file.c:388
Code: 00 74 12 48 89 df e8 c1 e5 a0 ff 48 ba 00 00 00 00 00 fc ff df 4c 89 2b 4c 8b 75 b8 49 81 c7 c8 00 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 74 e4 a0 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc9000102fae0 EFLAGS: 00010202

RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffff888114820000
RDX: dffffc0000000000 RSI: 0000000000000a06 RDI: ffff8881236c3778
RBP: ffffc9000102fb28 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000205f2c R12: 0000000000008000
R13: ffff88811320e400 R14: ffff8881236c3700 R15: 00000000000000c8
FS:  000055556d4ac500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556d4ac4a8 CR3: 000000011521e000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	00 74 12 48          	add    %dh,0x48(%rdx,%rdx,1)
   4:	89 df                	mov    %ebx,%edi
   6:	e8 c1 e5 a0 ff       	call   0xffa0e5cc
   b:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  12:	fc ff df
  15:	4c 89 2b             	mov    %r13,(%rbx)
  18:	4c 8b 75 b8          	mov    -0x48(%rbp),%r14
  1c:	49 81 c7 c8 00 00 00 	add    $0xc8,%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
  2e:	74 12                	je     0x42
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 74 e4 a0 ff       	call   0xffa0e4ac
  38:	48                   	rex.W
  39:	ba 00 00 00 00       	mov    $0x0,%edx
  3e:	00 fc                	add    %bh,%ah