[v5.15] general protection fault in acpi_fan_probe

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: aabd761612db Linux 5.15.215
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15b0ba79580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=aefba21e195ea9c77a66
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f636f56d3662/disk-aabd7616.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f1a46620f40c/vmlinux-aabd7616.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9b78bb48b022/bzImage-aabd7616.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aefba2...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000050: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000280-0x0000000000000287]
CPU: 1 PID: 6896 Comm: syz.2.840 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:acpi_fan_probe+0x109/0x10b0 drivers/acpi/fan.c:387
Code: 00 48 85 c0 0f 84 1c 05 00 00 48 89 c2 4c 89 7c 24 48 48 8d 8b 80 02 00 00 49 89 cf 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <41> 80 3c 07 00 48 89 4c 24 28 48 89 54 24 30 74 18 48 8d bb 80 02
RSP: 0018:ffffc900054bf8e0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000280
RDX: ffff88807e0aff28 RSI: ffffffff8a2b2be0 RDI: 00000000ffffffff
RBP: ffffc900054bfa98 R08: ffffffff901ee17f R09: 1ffffffff203dc2f
R10: dffffc0000000000 R11: fffffbfff203dc30 R12: ffff88801bef4000
R13: 1ffff92000a97f2c R14: fffffffffffffff0 R15: 0000000000000050
FS: 00007f91902a06c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001c4030 CR3: 0000000040893000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000006800 DR2: 0000000000009951
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
platform_probe+0x137/0x1c0 drivers/base/platform.c:1391
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x276/0xc70 drivers/base/dd.c:595
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775
device_driver_attach+0xdc/0x1d0 drivers/base/dd.c:1096
bind_store+0x33b/0x380 drivers/base/bus.c:216
kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2173 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x748/0xd70 fs/read_write.c:594
ksys_write+0x153/0x260 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f91920480d9
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:00007f91902a0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f91922cffa0 RCX: 00007f91920480d9
RDX: 0000000000000006 RSI: 0000200000000400 RDI: 0000000000000004
RBP: 00007f91920df024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f91922d0038 R14: 00007f91922cffa0 R15: 00007ffcdb888148
</TASK>
Modules linked in:
---[ end trace ea4a6b423ee22fe8 ]---
RIP: 0010:acpi_fan_probe+0x109/0x10b0 drivers/acpi/fan.c:387
Code: 00 48 85 c0 0f 84 1c 05 00 00 48 89 c2 4c 89 7c 24 48 48 8d 8b 80 02 00 00 49 89 cf 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <41> 80 3c 07 00 48 89 4c 24 28 48 89 54 24 30 74 18 48 8d bb 80 02
RSP: 0018:ffffc900054bf8e0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000280
RDX: ffff88807e0aff28 RSI: ffffffff8a2b2be0 RDI: 00000000ffffffff
RBP: ffffc900054bfa98 R08: ffffffff901ee17f R09: 1ffffffff203dc2f
R10: dffffc0000000000 R11: fffffbfff203dc30 R12: ffff88801bef4000
R13: 1ffff92000a97f2c R14: fffffffffffffff0 R15: 0000000000000050
FS: 00007f91902a06c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c76b97286 CR3: 0000000040893000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000004089
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 48 85 add %cl,-0x7b(%rax)
3: c0 0f 84 rorb $0x84,(%rdi)
6: 1c 05 sbb $0x5,%al
8: 00 00 add %al,(%rax)
a: 48 89 c2 mov %rax,%rdx
d: 4c 89 7c 24 48 mov %r15,0x48(%rsp)
12: 48 8d 8b 80 02 00 00 lea 0x280(%rbx),%rcx
19: 49 89 cf mov %rcx,%r15
1c: 49 c1 ef 03 shr $0x3,%r15
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 41 80 3c 07 00 cmpb $0x0,(%r15,%rax,1) <-- trapping instruction
2f: 48 89 4c 24 28 mov %rcx,0x28(%rsp)
34: 48 89 54 24 30 mov %rdx,0x30(%rsp)
39: 74 18 je 0x53
3b: 48 rex.W
3c: 8d .byte 0x8d
3d: bb .byte 0xbb
3e: 80 .byte 0x80
3f: 02 .byte 0x2


---
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[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d27334b2888c Linux 6.6.151
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10c09a25580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=3fb7a837c3ab8be764a9

compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/695139abd971/disk-d27334b2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b11fc121442a/vmlinux-d27334b2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e226f54f9286/bzImage-d27334b2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+3fb7a8...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc000000004b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000258-0x000000000000025f]
CPU: 0 PID: 7096 Comm: syz.0.408 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026

RIP: 0010:acpi_fan_probe+0x116/0xef0 drivers/acpi/fan_core.c:327
Code: 00 4c 89 ff ba c0 0d 00 00 e8 b6 99 c1 00 48 85 c0 0f 84 3e 04 00 00 4c 89 7c 24 68 4c 8d bb 58 02 00 00 4d 89 fe 49 c1 ee 03 <43> 80 3c 2e 00 48 89 44 24 18 74 0d 4c 89 ff e8 86 f7 4f fd 48 8b
RSP: 0018:ffffc900035b7940 EFLAGS: 00010206
RAX: ffff88802685cf28 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 00000000ffffffff
RBP: ffffc900035b7b40 R08: ffffffff911ed5b7 R09: 1ffffffff223dab6
R10: dffffc0000000000 R11: fffffbfff223dab7 R12: ffff8881412f3000
R13: dffffc0000000000 R14: 000000000000004b R15: 0000000000000258
FS: 00007ffb2a11f6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000110c32ef33 CR3: 000000002f10c000 CR4: 00000000003506f0
Call Trace:
<TASK>
platform_probe+0x13b/0x1c0 drivers/base/platform.c:1376
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x247/0xae0 drivers/base/dd.c:717
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1206
bind_store+0x1cc/0x210 drivers/base/bus.c:267
kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
call_write_iter include/linux/fs.h:2018 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x474/0x9a0 fs/read_write.c:584
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffb2919e0d9

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:00007ffb2a11f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffb29425fa0 RCX: 00007ffb2919e0d9

RDX: 0000000000000006 RSI: 0000200000000400 RDI: 0000000000000004

RBP: 00007ffb29235024 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007ffb29426038 R14: 00007ffb29425fa0 R15: 00007ffe30fc6888
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:acpi_fan_probe+0x116/0xef0 drivers/acpi/fan_core.c:327
Code: 00 4c 89 ff ba c0 0d 00 00 e8 b6 99 c1 00 48 85 c0 0f 84 3e 04 00 00 4c 89 7c 24 68 4c 8d bb 58 02 00 00 4d 89 fe 49 c1 ee 03 <43> 80 3c 2e 00 48 89 44 24 18 74 0d 4c 89 ff e8 86 f7 4f fd 48 8b
RSP: 0018:ffffc900035b7940 EFLAGS: 00010206
RAX: ffff88802685cf28 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 00000000ffffffff
RBP: ffffc900035b7b40 R08: ffffffff911ed5b7 R09: 1ffffffff223dab6
R10: dffffc0000000000 R11: fffffbfff223dab7 R12: ffff8881412f3000
R13: dffffc0000000000 R14: 000000000000004b R15: 0000000000000258
FS: 00007ffb2a11f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000555588134a78 CR3: 000000002f10c000 CR4: 00000000003506e0

----------------
Code disassembly (best guess):

0: 00 4c 89 ff add %cl,-0x1(%rcx,%rcx,4)
4: ba c0 0d 00 00 mov $0xdc0,%edx
9: e8 b6 99 c1 00 call 0xc199c4
e: 48 85 c0 test %rax,%rax
11: 0f 84 3e 04 00 00 je 0x455
17: 4c 89 7c 24 68 mov %r15,0x68(%rsp)
1c: 4c 8d bb 58 02 00 00 lea 0x258(%rbx),%r15
23: 4d 89 fe mov %r15,%r14
26: 49 c1 ee 03 shr $0x3,%r14
* 2a: 43 80 3c 2e 00 cmpb $0x0,(%r14,%r13,1) <-- trapping instruction
2f: 48 89 44 24 18 mov %rax,0x18(%rsp)
34: 74 0d je 0x43
36: 4c 89 ff mov %r15,%rdi
39: e8 86 f7 4f fd call 0xfd4ff7c4
3e: 48 rex.W
3f: 8b .byte 0x8b

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e4f7d8be268e Linux 6.1.182
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=157c8679580000
kernel config: https://syzkaller.appspot.com/x/.config?x=31dfefc4a14efea3
dashboard link: https://syzkaller.appspot.com/bug?extid=a95b05ec52c4cd3c14b5

compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/156843a60452/disk-e4f7d8be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/719d532a0151/vmlinux-e4f7d8be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/12160bc2f9ec/bzImage-e4f7d8be.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+a95b05...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc000000004b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000258-0x000000000000025f]

CPU: 1 PID: 4691 Comm: syz.3.78 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026

RIP: 0010:acpi_fan_probe+0x112/0xf50 drivers/acpi/fan_core.c:326
Code: 00 4c 89 ff ba c0 0d 00 00 e8 6a 66 b1 00 48 85 c0 0f 84 3e 04 00 00 4c 89 7c 24 68 4c 8d bb 58 02 00 00 4d 89 fe 49 c1 ee 03 <43> 80 3c 2e 00 48 89 44 24 28 74 0d 4c 89 ff e8 ca a3 6d fd 48 8b
RSP: 0018:ffffc9000540f8c0 EFLAGS: 00010206
RAX: ffff88802ecf1d28 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: 00000000ffffffff
RBP: ffffc9000540faa8 R08: ffffffff90b102ef R09: 1ffffffff216205d
R10: dffffc0000000000 R11: fffffbfff216205e R12: ffff88801eedd000

R13: dffffc0000000000 R14: 000000000000004b R15: 0000000000000258

FS: 00007f15c9e576c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000110c347e46 CR3: 000000002fb6b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>

platform_probe+0x137/0x1c0 drivers/base/platform.c:1400
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x24a/0xb40 drivers/base/dd.c:638
__driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804
device_driver_attach+0xd9/0x1c0 drivers/base/dd.c:1131
bind_store+0x33b/0x380 drivers/base/bus.c:216
kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x482/0x9a0 fs/read_write.c:584
ksys_write+0x14d/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f15c8f9e0d9

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:00007f15c9e57028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f15c9225fa0 RCX: 00007f15c8f9e0d9
RDX: 0000000000000007 RSI: 0000200000000400 RDI: 0000000000000003
RBP: 00007f15c9035024 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007f15c9226038 R14: 00007f15c9225fa0 R15: 00007fff0f3d2398

</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---

RIP: 0010:acpi_fan_probe+0x112/0xf50 drivers/acpi/fan_core.c:326
Code: 00 4c 89 ff ba c0 0d 00 00 e8 6a 66 b1 00 48 85 c0 0f 84 3e 04 00 00 4c 89 7c 24 68 4c 8d bb 58 02 00 00 4d 89 fe 49 c1 ee 03 <43> 80 3c 2e 00 48 89 44 24 28 74 0d 4c 89 ff e8 ca a3 6d fd 48 8b
RSP: 0018:ffffc9000540f8c0 EFLAGS: 00010206
RAX: ffff88802ecf1d28 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: 00000000ffffffff
RBP: ffffc9000540faa8 R08: ffffffff90b102ef R09: 1ffffffff216205d
R10: dffffc0000000000 R11: fffffbfff216205e R12: ffff88801eedd000

----------------
Code disassembly (best guess):
0: 00 4c 89 ff add %cl,-0x1(%rcx,%rcx,4)
4: ba c0 0d 00 00 mov $0xdc0,%edx

9: e8 6a 66 b1 00 call 0xb16678

e: 48 85 c0 test %rax,%rax
11: 0f 84 3e 04 00 00 je 0x455
17: 4c 89 7c 24 68 mov %r15,0x68(%rsp)
1c: 4c 8d bb 58 02 00 00 lea 0x258(%rbx),%r15
23: 4d 89 fe mov %r15,%r14
26: 49 c1 ee 03 shr $0x3,%r14
* 2a: 43 80 3c 2e 00 cmpb $0x0,(%r14,%r13,1) <-- trapping instruction

2f: 48 89 44 24 28 mov %rax,0x28(%rsp)

34: 74 0d je 0x43
36: 4c 89 ff mov %r15,%rdi

39: e8 ca a3 6d fd call 0xfd6da408