From: syzbot <syzbot+37b56485bbbf90ad8489@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, eddyz87@gmail.com, emil@etsalapatis.com,
ihor.solodrai@linux.dev, jolsa@kernel.org,
linux-kernel@vger.kernel.org, martin.lau@linux.dev,
memxor@gmail.com, song@kernel.org,
syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev
Subject: [syzbot] [bpf?] general protection fault in btf_type_show
Date: Wed, 26 Aug 2026 13:37:28 -0700 [thread overview]
Message-ID: <6a8f4e88.27659fcc.2ceef7.0008.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=135ef179580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
dashboard link: https://syzkaller.appspot.com/bug?extid=37b56485bbbf90ad8489
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1437a179580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-818bebeb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6e4100526b12/vmlinux-818bebeb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/723c4783ee96/bzImage-818bebeb.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+37b56485bbbf90ad8489@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 2 UID: 0 PID: 5908 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:btf_type_show+0x223/0x2e0 kernel/bpf/btf.c:8232
Code: c1 ea 03 80 3c 02 00 0f 85 90 00 00 00 48 8b 1c dd 40 25 fd 8b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 77 48 8b 43 28 48 8b 0c 24 48 83 c4 08 4d 89 e9 5b
RSP: 0018:ffffc900034bf868 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000028
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900034bf970 R11: 0000000000000001 R12: ffffffff9b96b140
R13: ffffc900034bf8e0 R14: ffff888035e3f600 R15: 0000000000000003
FS: 00005555665e7500(0000) GS:ffff8880d5da2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000027a0f000 CR4: 0000000000352ef0
Call Trace:
<TASK>
btf_type_seq_show_flags+0xca/0x120 kernel/bpf/btf.c:8250
htab_map_seq_show_elem+0x12e/0x350 kernel/bpf/hashtab.c:1669
map_seq_show+0x13d/0x1e0 kernel/bpf/inode.c:293
traverse.part.0.constprop.0+0x107/0x650 fs/seq_file.c:112
traverse fs/seq_file.c:99 [inline]
seq_read_iter+0x93f/0x1270 fs/seq_file.c:196
seq_read+0x344/0x4d0 fs/seq_file.c:163
vfs_read+0x1e4/0xb40 fs/read_write.c:572
ksys_pread64 fs/read_write.c:764 [inline]
__do_sys_pread64 fs/read_write.c:772 [inline]
__se_sys_pread64 fs/read_write.c:769 [inline]
__x64_sys_pread64+0x1eb/0x250 fs/read_write.c:769
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa99f79e0d9
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:00007fff8937c6c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007fa99fa25fa0 RCX: 00007fa99f79e0d9
RDX: 0000000000000083 RSI: 0000200000002240 RDI: 0000000000000007
RBP: 00007fa99f835024 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000e5d6 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa99fa25fac R14: 00007fa99fa25fa0 R15: 00007fa99fa25fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btf_type_show+0x223/0x2e0 kernel/bpf/btf.c:8232
Code: c1 ea 03 80 3c 02 00 0f 85 90 00 00 00 48 8b 1c dd 40 25 fd 8b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 77 48 8b 43 28 48 8b 0c 24 48 83 c4 08 4d 89 e9 5b
RSP: 0018:ffffc900034bf868 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000028
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900034bf970 R11: 0000000000000001 R12: ffffffff9b96b140
R13: ffffc900034bf8e0 R14: ffff888035e3f600 R15: 0000000000000003
FS: 00005555665e7500(0000) GS:ffff8880d5da2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000027a0f000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: c1 ea 03 shr $0x3,%edx
3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
7: 0f 85 90 00 00 00 jne 0x9d
d: 48 8b 1c dd 40 25 fd mov -0x7402dac0(,%rbx,8),%rbx
14: 8b
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 48 8d 7b 28 lea 0x28(%rbx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 75 77 jne 0xa7
30: 48 8b 43 28 mov 0x28(%rbx),%rax
34: 48 8b 0c 24 mov (%rsp),%rcx
38: 48 83 c4 08 add $0x8,%rsp
3c: 4d 89 e9 mov %r13,%r9
3f: 5b pop %rbx
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
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reply other threads:[~2026-08-26 20:37 UTC|newest]
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