syzbot
general protection fault in hfsplus_cat_write_inode
Status:
upstream: reported C repro on 2026/04/13 21:50
Subsystems:
hfs
Labels:
prio:high
[Documentation on labels]
Reported-by: syzbot+c0ba772a362e70937dfb@syzkaller.appspotmail.com
First crash: 175d, last: 2d06h
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Last patch testing requests (6)
Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 5987 Comm: syz.0.22 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:hfsplus_cat_write_inode+0xc4/0x9c0 fs/hfsplus/inode.c:680
Code: 51 4a 89 44 2b 59 66 42 c7 44 2b 61 f3 f3 42 c6 44 2b 63 f3 e8 bd 75 1e ff 4d 8d 7c 24 28 4c 89 f8 48 c1 e8 03 48 89 44 24 38 <42> 80 3c 28 00 74 08 4c 89 ff e8 5d eb 87 ff 41 be 18 08 00 00 4c
RSP: 0018:ffffc900041cf680 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 1ffff92000839ed8 RCX: ffff88802e3f9f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041cfa30 R08: 0000000000000000 R09: 0000000000000000
R10: fffff52000839ee8 R11: fffffbfff1f5e927 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802aa71c50 R15: 0000000000000028
FS: 00007f91127ae6c0(0000) GS:ffff888125d46000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3db8322000 CR3: 00000000380de000 CR4: 00000000003526f0
Call Trace:
<TASK>
hfsplus_unlink+0x5e0/0x8e0 fs/hfsplus/dir.c:429
hfsplus_rename+0xd5/0x280 fs/hfsplus/dir.c:591
vfs_rename+0xbd9/0xef0 fs/namei.c:6074
filename_renameat2+0x533/0x9b0 fs/namei.c:6192
__do_sys_rename fs/namei.c:6236 [inline]
__se_sys_rename+0x55/0x2c0 fs/namei.c:6232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f911314e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f91127ae028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f91133d5fa0 RCX: 00007f911314e0d9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000200000000880
RBP: 00007f91131e5024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f91133d6038 R14: 00007f91133d5fa0 R15: 00007ffeded30248
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfsplus_cat_write_inode+0xc4/0x9c0 fs/hfsplus/inode.c:680
Code: 51 4a 89 44 2b 59 66 42 c7 44 2b 61 f3 f3 42 c6 44 2b 63 f3 e8 bd 75 1e ff 4d 8d 7c 24 28 4c 89 f8 48 c1 e8 03 48 89 44 24 38 <42> 80 3c 28 00 74 08 4c 89 ff e8 5d eb 87 ff 41 be 18 08 00 00 4c
RSP: 0018:ffffc900041cf680 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 1ffff92000839ed8 RCX: ffff88802e3f9f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041cfa30 R08: 0000000000000000 R09: 0000000000000000
R10: fffff52000839ee8 R11: fffffbfff1f5e927 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802aa71c50 R15: 0000000000000028
FS: 00007f91127ae6c0(0000) GS:ffff888125d46000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3db8322000 CR3: 00000000380de000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 51 push %rcx
1: 4a 89 44 2b 59 mov %rax,0x59(%rbx,%r13,1)
6: 66 42 c7 44 2b 61 f3 movw $0xf3f3,0x61(%rbx,%r13,1)
d: f3
e: 42 c6 44 2b 63 f3 movb $0xf3,0x63(%rbx,%r13,1)
14: e8 bd 75 1e ff call 0xff1e75d6
19: 4d 8d 7c 24 28 lea 0x28(%r12),%r15
1e: 4c 89 f8 mov %r15,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 48 89 44 24 38 mov %rax,0x38(%rsp)
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ff mov %r15,%rdi
34: e8 5d eb 87 ff call 0xff87eb96
39: 41 be 18 08 00 00 mov $0x818,%r14d
3f: 4c rex.WR
* Struck through repros no longer work on HEAD.