[v5.15] Internal error in lookup_ioctx

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c79648372d02 Linux 5.15.189
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1249b042580000
kernel config: https://syzkaller.appspot.com/x/.config?x=9e47345638b85bd0
dashboard link: https://syzkaller.appspot.com/bug?extid=30dda2cd2979f1255c63
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7ab49562317a/disk-c7964837.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e847ec1e38d3/vmlinux-c7964837.xz
kernel image: https://storage.googleapis.com/syzbot-assets/263158c6371c/Image-c7964837.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+30dda2...@syzkaller.appspotmail.com

Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4118 Comm: syz.4.72 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : lookup_ioctx+0x108/0x7d0 fs/aio.c:1070
lr : lookup_ioctx+0xe4/0x7d0 fs/aio.c:1070
sp : ffff80001f2c7b20
x29: ffff80001f2c7b20 x28: ffff0000cd8551c0 x27: dfff800000000000
x26: ffff80001f2c7b80 x25: ffff700003e58f70 x24: ffff0000cbf35080
x23: dfff800000000000 x22: 00000000fffffff2 x21: 0000000000000000
x20: ffff0000cd8551c0 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800008a19714 x15: 0000000000000000
x14: 0000000000000000 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000ffffffffffff
x8 : 0000000000000000 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
lookup_ioctx+0x108/0x7d0 fs/aio.c:1070
do_io_getevents+0x120/0x394 fs/aio.c:2186
__do_sys_io_getevents fs/aio.c:2224 [inline]
__se_sys_io_getevents fs/aio.c:2212 [inline]
__arm64_sys_io_getevents+0x160/0x23c fs/aio.c:2212
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f6 2a1f03e0 b8400953 (2a1603e1)
---[ end trace 47980195ea2d6358 ]---
----------------
Code disassembly (best guess):
0: d503229f csdb
4: 2a1f03f6 mov w22, wzr
8: 2a1f03e0 mov w0, wzr
c: b8400953 ldtr w19, [x10]
* 10: 2a1603e1 mov w1, w22 <-- trapping instruction


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: c79648372d02 Linux 5.15.189
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=106849a2580000

kernel config: https://syzkaller.appspot.com/x/.config?x=9e47345638b85bd0
dashboard link: https://syzkaller.appspot.com/bug?extid=30dda2cd2979f1255c63
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=156cf2f0580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=176001a2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7ab49562317a/disk-c7964837.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e847ec1e38d3/vmlinux-c7964837.xz
kernel image: https://storage.googleapis.com/syzbot-assets/263158c6371c/Image-c7964837.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+30dda2...@syzkaller.appspotmail.com

Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:

CPU: 1 PID: 4243 Comm: syz.0.17 Not tainted 5.15.189-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : lookup_ioctx+0x108/0x7d0 fs/aio.c:1070
lr : lookup_ioctx+0xe4/0x7d0 fs/aio.c:1070

sp : ffff80001fe07c20
x29: ffff80001fe07c20 x28: ffff0000dca90000 x27: 0000000000000000
x26: 1fffe0001b952000 x25: 1ffff00003fc0fd6 x24: ffff0000d39ed080

x23: dfff800000000000 x22: 00000000fffffff2 x21: 0000000000000000

x20: ffff0000dca90000 x19: 0000000000000000 x18: 0000000000000000

x17: 0000000000000000 x16: ffff800008a19714 x15: 0000000000000000
x14: 0000000000000000 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000ffffffffffff
x8 : 0000000000000000 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
lookup_ioctx+0x108/0x7d0 fs/aio.c:1070

__do_sys_io_submit fs/aio.c:2053 [inline]
__se_sys_io_submit fs/aio.c:2042 [inline]
__arm64_sys_io_submit+0x110/0x40c fs/aio.c:2042

__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f6 2a1f03e0 b8400953 (2a1603e1)

---[ end trace a0dc0c38c2bf8b54 ]---

----------------
Code disassembly (best guess):
0: d503229f csdb
4: 2a1f03f6 mov w22, wzr
8: 2a1f03e0 mov w0, wzr
c: b8400953 ldtr w19, [x10]
* 10: 2a1603e1 mov w1, w22 <-- trapping instruction


---

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