syzbot


BUG: unable to handle kernel paging request in bpf_trace_run2

Status: fixed on 2021/04/13 19:14
Subsystems: bpf trace
[Documentation on labels]
Reported-by: syzbot+cc36fd07553c0512f5f7@syzkaller.appspotmail.com
Fix commit: befe6d946551 tracepoint: Do not fail unregistering a probe due to memory failure
First crash: 1339d, last: 1177d
Cause bisection: introduced by (bisect log) :
commit 58956317c8de52009d1a38a721474c24aef74fe7
Author: David Ahern <dsahern@gmail.com>
Date: Fri Dec 7 20:24:57 2018 +0000

  neighbor: Improve garbage collection

Crash: BUG: corrupted list in neigh_mark_dead (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit befe6d946551d65cddbd32b9cb0170b0249fd5ed
Author: Steven Rostedt (VMware) <rostedt@goodmis.org>
Date: Wed Nov 18 14:34:05 2020 +0000

  tracepoint: Do not fail unregistering a probe due to memory failure

  
Discussions (1)
Title Replies (including bot) Last reply
BUG: unable to handle kernel paging request in bpf_trace_run2 1 (5) 2021/04/13 07:57
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-54 BUG: unable to handle kernel paging request in bpf_trace_run2 C 4 1182d 1336d 0/2 auto-obsoleted due to no activity on 2023/04/17 21:30
Fix bisection attempts (4)
Created Duration User Patch Repo Result
2021/04/01 13:43 4h16m bisect fix bpf job log (1)
2021/03/01 05:15 21m bisect fix bpf job log (0) log
2021/02/04 08:05 0m bisect fix bpf error job log (0)
2020/12/16 09:22 18m bisect fix bpf job log (0) log

Sample crash report:
BUG: unable to handle page fault for address: ffffc90000ed0030
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD aa000067 P4D aa000067 PUD aa169067 PMD a9031067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6868 Comm: syz-executor454 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_dispatcher_nop_func include/linux/bpf.h:586 [inline]
RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:1887 [inline]
RIP: 0010:bpf_trace_run2+0x12e/0x3d0 kernel/trace/bpf_trace.c:1924
Code: f7 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 8e 02 00 00 48 8d 73 38 48 8d 7c 24 28 <ff> 53 30 e8 fa 03 f7 ff e8 45 c8 a4 06 31 ff 89 c3 89 c6 e8 4a 00
RSP: 0018:ffffc900018e7e90 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffc90000ed0000 RCX: ffffffff817f2b88
RDX: 0000000000000000 RSI: ffffc90000ed0038 RDI: ffffc900018e7eb8
RBP: 1ffff9200031cfd3 R08: 0000000000000000 R09: ffffffff8d0b69e7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffc900018e7f58 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000001079880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000ed0030 CR3: 000000009f63f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 trace_sys_enter include/trace/events/syscalls.h:18 [inline]
 syscall_trace_enter kernel/entry/common.c:64 [inline]
 syscall_enter_from_user_mode+0x22c/0x290 kernel/entry/common.c:82
 do_syscall_64+0xf/0x70 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4441da
Code: 25 18 00 00 00 00 74 01 f0 48 0f b1 3d cf f9 28 00 48 39 c2 75 da f3 c3 0f 1f 84 00 00 00 00 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 c7 c2 d0 ff ff ff f7
RSP: 002b:00007ffc59deef98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4
RAX: ffffffffffffffda RBX: 0000000000001ae1 RCX: 00000000004441da
RDX: 0000000000000000 RSI: 00007ffc59deefa0 RDI: 0000000000000001
RBP: 000000000000ee75 R08: 0000000000001ad4 R09: 0000000001079880
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004022f0
R13: 0000000000402380 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: ffffc90000ed0030
---[ end trace 7a32b71ba0e36806 ]---
RIP: 0010:bpf_dispatcher_nop_func include/linux/bpf.h:586 [inline]
RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:1887 [inline]
RIP: 0010:bpf_trace_run2+0x12e/0x3d0 kernel/trace/bpf_trace.c:1924
Code: f7 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 8e 02 00 00 48 8d 73 38 48 8d 7c 24 28 <ff> 53 30 e8 fa 03 f7 ff e8 45 c8 a4 06 31 ff 89 c3 89 c6 e8 4a 00
RSP: 0018:ffffc900018e7e90 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffffc90000ed0000 RCX: ffffffff817f2b88
RDX: 0000000000000000 RSI: ffffc90000ed0038 RDI: ffffc900018e7eb8
RBP: 1ffff9200031cfd3 R08: 0000000000000000 R09: ffffffff8d0b69e7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffc900018e7f58 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000001079880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000ed0030 CR3: 000000009f63f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/22 19:11 bpf 1245008122d7 3e8f6c27 .config console log report syz C ci-upstream-bpf-kasan-gce
2021/01/05 08:05 bpf 04901aab40ea 2a28ff1f .config console log report info ci-upstream-bpf-kasan-gce
2020/11/09 20:08 bpf 4e0396c59559 64069d48 .config console log report info ci-upstream-bpf-kasan-gce
2020/10/29 09:48 bpf c66dca98a24c f24824d3 .config console log report info ci-upstream-bpf-kasan-gce
2020/10/27 07:22 bpf 435ccfa894e3 8b3eaf58 .config console log report info ci-upstream-bpf-kasan-gce
2020/10/08 12:17 bpf d82a532a6115 1880b4a9 .config console log report info ci-upstream-bpf-kasan-gce
2020/09/22 18:49 bpf 1245008122d7 3e8f6c27 .config console log report info ci-upstream-bpf-kasan-gce
2021/01/05 08:04 bpf-next 482ec343f40a 2a28ff1f .config console log report info ci-upstream-bpf-next-kasan-gce
2020/10/02 07:46 bpf-next 6208689fb3e6 9602ddf4 .config console log report info ci-upstream-bpf-next-kasan-gce
2020/09/19 21:25 bpf-next 70b971118e07 53ce8104 .config console log report info ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.