syzbot


BUG: unable to handle kernel NULL pointer dereference in bpf_test_run

Status: upstream: reported C repro on 2023/10/13 04:35
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+692e0f683c59aa374c37@syzkaller.appspotmail.com
First crash: 246d, last: 246d
Fix commit to backport (bisect log) :
tree: upstream
commit 4121d4481b72501aa4d22680be4ea1096d69d133
Author: Jiri Olsa <jolsa@kernel.org>
Date: Wed Dec 14 12:35:42 2022 +0000

  bpf: Synchronize dispatcher update with bpf_dispatcher_xdp_func

  
Bug presence (2)
Date Name Commit Repro Result
2023/10/13 linux-6.1.y (ToT) 082280fe94a0 C [report] BUG: unable to handle kernel paging request in bpf_dispatcher_xdp
2023/10/13 upstream (ToT) ce583d5fb9d3 C Didn't crash
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 BUG: unable to handle kernel paging request in bpf_test_run 1 325d 325d 0/2 auto-obsoleted due to no activity on 2023/10/23 16:24
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2023/10/17 09:16 5h22m fix candidate upstream job log (1)

Sample crash report:
BUG: kernel NULL pointer dereference, address: 0000000000000018
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1f8ef067 P4D 1f8ef067 PUD 1fdf8067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3561 Comm: syz-executor357 Not tainted 6.1.57-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:0x18
Code: Unable to access opcode bytes at 0xffffffffffffffee.
RSP: 0018:ffffc90003adf970 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc90003adfa60 RCX: ffff888022849dc0
RDX: ffffffffa00008c8 RSI: ffffc90000bbe048 RDI: ffffc90003adfc80
RBP: ffffc90003adf970 R08: ffffffff88bd5577 R09: ffffed10045093b9
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90000bbe030 R14: 0000000000000000 R15: ffffc90003adfc60
FS:  00007f2584e556c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffee CR3: 000000001f74a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run_xdp include/linux/filter.h:775 [inline]
 bpf_test_run+0x3d4/0x8b0 net/bpf/test_run.c:400
 bpf_prog_test_run_xdp+0x7a7/0x1130 net/bpf/test_run.c:1389
 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3633
 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:4986
 __do_sys_bpf kernel/bpf/syscall.c:5072 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5070 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5070
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2584e94959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2584e55238 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f2584f1e328 RCX: 00007f2584e94959
RDX: 0000000000000048 RSI: 0000000020001480 RDI: 000000000000000a
RBP: 00007f2584f1e320 R08: 00007f2584e556c0 R09: 00007f2584e556c0
R10: 00007f2584e556c0 R11: 0000000000000246 R12: 00007f2584eeb074
R13: 0000000000000000 R14: 00007ffe6567eed0 R15: 00007ffe6567efb8
 </TASK>
Modules linked in:
CR2: 0000000000000018
---[ end trace 0000000000000000 ]---
RIP: 0010:0x18
Code: Unable to access opcode bytes at 0xffffffffffffffee.
RSP: 0018:ffffc90003adf970 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc90003adfa60 RCX: ffff888022849dc0
RDX: ffffffffa00008c8 RSI: ffffc90000bbe048 RDI: ffffc90003adfc80
RBP: ffffc90003adf970 R08: ffffffff88bd5577 R09: ffffed10045093b9
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90000bbe030 R14: 0000000000000000 R15: ffffc90003adfc60
FS:  00007f2584e556c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffee CR3: 000000001f74a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/13 04:35 linux-6.1.y 082280fe94a0 6388bc36 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf BUG: unable to handle kernel NULL pointer dereference in bpf_test_run
* Struck through repros no longer work on HEAD.