[v5.15] Internal error in generic_map_lookup_batch

[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=10b0b2f0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=9e47345638b85bd0
dashboard link: https://syzkaller.appspot.com/bug?extid=12f61f5e1a1ea72e33d1
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+12f61f...@syzkaller.appspotmail.com

Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4166 Comm: syz.3.7 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 : generic_map_lookup_batch+0x400/0xd50 kernel/bpf/syscall.c:1466
lr : generic_map_lookup_batch+0x3dc/0xd50 kernel/bpf/syscall.c:1466
sp : ffff80001fcd7a20
x29: ffff80001fcd7b50 x28: dfff800000000000 x27: 1ffff00003f9af5c
x26: 0000000000002318 x25: 0000000020000260 x24: 0000002000026000
x23: 00000000fffffff2 x22: fffffff800000107 x21: ffff80001fcd7c68
x20: ffff0000cd274c00 x19: 1ffff00003f9af8d x18: 0000000000000000
x17: 0000000000000002 x16: ffff800008518cdc x15: 0000000000000015
x14: 0000000000ff0100 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000020000260 x9 : 0000ffffffffffff
x8 : 0000000020000260 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
generic_map_lookup_batch+0x400/0xd50 kernel/bpf/syscall.c:1466
bpf_map_do_batch+0x260/0x530 kernel/bpf/syscall.c:4233
__sys_bpf+0x368/0x5f0 kernel/bpf/syscall.c:-1
__do_sys_bpf kernel/bpf/syscall.c:4755 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4753 [inline]
__arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:4753
__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 2a1f03f7 2a1f03e0 b8000957 (2a1703e1)
---[ end trace 1fac5ee6e20a9c7d ]---
----------------
Code disassembly (best guess):
0: d503229f csdb
4: 2a1f03f7 mov w23, wzr
8: 2a1f03e0 mov w0, wzr
c: b8000957 sttr w23, [x10]
* 10: 2a1703e1 mov w1, w23 <-- 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=14b01842580000

kernel config: https://syzkaller.appspot.com/x/.config?x=9e47345638b85bd0
dashboard link: https://syzkaller.appspot.com/bug?extid=12f61f5e1a1ea72e33d1
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=1439f5a2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1239f5a2580000

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+12f61f...@syzkaller.appspotmail.com

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

CPU: 0 PID: 4220 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 : generic_map_lookup_batch+0x400/0xd50 kernel/bpf/syscall.c:1466
lr : generic_map_lookup_batch+0x3dc/0xd50 kernel/bpf/syscall.c:1466

sp : ffff80001fd47a20
x29: ffff80001fd47b50 x28: dfff800000000000 x27: 1ffff00003fa8f5c

x26: 0000000000002318 x25: 0000000020000260 x24: 0000002000026000

x23: 00000000fffffff2 x22: fffffff800000107 x21: ffff80001fd47c68
x20: ffff0000cfc04c00 x19: 1ffff00003fa8f8d x18: 0000000000000000
x17: 0000000000000000 x16: ffff800008518cdc x15: 0000000000000015

x14: 0000000000ff0100 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000020000260 x9 : 0000ffffffffffff
x8 : 0000000020000260 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
generic_map_lookup_batch+0x400/0xd50 kernel/bpf/syscall.c:1466
bpf_map_do_batch+0x260/0x530 kernel/bpf/syscall.c:4233
__sys_bpf+0x368/0x5f0 kernel/bpf/syscall.c:-1
__do_sys_bpf kernel/bpf/syscall.c:4755 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4753 [inline]
__arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:4753
__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 2a1f03f7 2a1f03e0 b8000957 (2a1703e1)

---[ end trace 818412737d16b3e3 ]---

----------------
Code disassembly (best guess):
0: d503229f csdb
4: 2a1f03f7 mov w23, wzr
8: 2a1f03e0 mov w0, wzr
c: b8000957 sttr w23, [x10]
* 10: 2a1703e1 mov w1, w23 <-- trapping instruction


---

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