syzbot


BUG: unable to handle kernel paging request in bpf_prog_select_runtime

Status: fixed on 2018/07/09 18:05
Subsystems: bpf
[Documentation on labels]
Reported-by: syzbot+d866d1925855328eac3b@syzkaller.appspotmail.com
Fix commit: 85782e037f8a bpf: undo prog rejection on read-only lock failure
First crash: 2160d, last: 2160d
Discussions (3)
Title Replies (including bot) Last reply
[PATCH 4.17 000/101] 4.17.9-stable review 100 (101) 2018/07/22 11:42
[PATCH bpf 0/3] Three BPF fixes 9 (9) 2018/07/02 21:12
BUG: unable to handle kernel paging request in bpf_prog_select_runtime 0 (1) 2018/06/24 07:32

Sample crash report:
BUG: unable to handle kernel paging request at ffffc90001952002
PGD 1da947067 P4D 1da947067 PUD 1da948067 PMD 1d3a61067 PTE 800000016ba62161
Oops: 0003 [#1] SMP KASAN
CPU: 0 PID: 17593 Comm: syz-executor3 Not tainted 4.18.0-rc1+ #114
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_prog_lock_ro include/linux/filter.h:681 [inline]
RIP: 0010:bpf_prog_select_runtime+0xf5/0xa60 kernel/bpf/core.c:1519
Code: 48 b8 00 00 00 00 00 fc ff df 48 89 ca 48 c1 ea 03 0f b6 14 02 48 89 c8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 de 08 00 00 <41> 80 66 02 fb e8 f1 67 f3 ff 49 8d 7e 20 48 b8 00 00 00 00 00 fc 
RSP: 0018:ffff8801b4d6fac8 EFLAGS: 00010246
RAX: 0000000000000003 RBX: 00000000fffffff4 RCX: ffffc90001952002
RDX: 0000000000000000 RSI: ffffffff8188a717 RDI: 0000000000000005
RBP: ffff8801b4d6fb30 R08: ffff8801d778e400 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90001952030 R14: ffffc90001952000 R15: ffff8801b4d6fb98
FS:  00007f59edc0c700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90001952002 CR3: 00000001d20b4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bpf_prog_load+0x1194/0x1c60 kernel/bpf/syscall.c:1356
 __do_sys_bpf kernel/bpf/syscall.c:2360 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:2322 [inline]
 __x64_sys_bpf+0x36c/0x510 kernel/bpf/syscall.c:2322
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a99
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f59edc0bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f59edc0c6d4 RCX: 0000000000455a99
RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015
R13: 00000000004bb7d5 R14: 00000000004c8508 R15: 0000000000000023
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: ffffc90001952002
---[ end trace f4bd75b0437a2cce ]---
RIP: 0010:bpf_prog_lock_ro include/linux/filter.h:681 [inline]
RIP: 0010:bpf_prog_select_runtime+0xf5/0xa60 kernel/bpf/core.c:1519
Code: 48 b8 00 00 00 00 00 fc ff df 48 89 ca 48 c1 ea 03 0f b6 14 02 48 89 c8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 de 08 00 00 <41> 80 66 02 fb e8 f1 67 f3 ff 49 8d 7e 20 48 b8 00 00 00 00 00 fc 
RSP: 0018:ffff8801b4d6fac8 EFLAGS: 00010246
RAX: 0000000000000003 RBX: 00000000fffffff4 RCX: ffffc90001952002
RDX: 0000000000000000 RSI: ffffffff8188a717 RDI: 0000000000000005
RBP: ffff8801b4d6fb30 R08: ffff8801d778e400 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90001952030 R14: ffffc90001952000 R15: ffff8801b4d6fb98
FS:  00007f59edc0c700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90001952002 CR3: 00000001d20b4000 CR4: 00000000001406f0
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
2018/06/23 21:49 upstream 5e2204832b20 2064fc5c .config console log report ci-upstream-kasan-gce-root
* Struck through repros no longer work on HEAD.