linux-kernel - Re: WARNING in bpf_int_jit

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Message-ID: <000000000000d29a1c056d188355@google.com>
Date:   Sat, 26 May 2018 02:29:01 -0700
From:   syzbot <syzbot+9e762b52dd17e616a7a5@...kaller.appspotmail.com>
To:     ast@...nel.org, daniel@...earbox.net, davem@...emloft.net,
        hpa@...or.com, kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        mingo@...hat.com, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        x86@...nel.org, yoshfuji@...ux-ipv6.org
Subject: Re: WARNING in bpf_int_jit_compile

syzbot has found a reproducer for the following crash on:

HEAD commit:    62d18ecfa641 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14c6bf57800000
kernel config:  https://syzkaller.appspot.com/x/.config?x=982e2df1b9e60b02
dashboard link: https://syzkaller.appspot.com/bug?extid=9e762b52dd17e616a7a5
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=130e42b7800000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9e762b52dd17e616a7a5@...kaller.appspotmail.com

RAX: ffffffffffffffda RBX: 0000000002542914 RCX: 0000000000455a09
RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000046 R14: 00000000006f4730 R15: 0000000000000023
WARNING: CPU: 0 PID: 4752 at include/linux/filter.h:667  
bpf_jit_binary_lock_ro include/linux/filter.h:667 [inline]
WARNING: CPU: 0 PID: 4752 at include/linux/filter.h:667  
bpf_int_jit_compile+0xbf7/0xef7 arch/x86/net/bpf_jit_comp.c:1271
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4752 Comm: syz-executor0 Not tainted 4.17.0-rc6+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
  panic+0x22f/0x4de kernel/panic.c:184
  __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
  report_bug+0x252/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:bpf_jit_binary_lock_ro include/linux/filter.h:667 [inline]
RIP: 0010:bpf_int_jit_compile+0xbf7/0xef7 arch/x86/net/bpf_jit_comp.c:1271
RSP: 0018:ffff8801d85ff920 EFLAGS: 00010293
RAX: ffff8801d78c40c0 RBX: 0000000000000046 RCX: ffffffff81445d89
RDX: 0000000000000000 RSI: ffffffff81445d97 RDI: 0000000000000005
RBP: ffff8801d85ffa40 R08: ffff8801d78c40c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000194e002
R13: ffff8801d85ffa18 R14: 00000000fffffff4 R15: 0000000000000003
  bpf_prog_select_runtime+0x131/0x640 kernel/bpf/core.c:1541
  bpf_prog_load+0x16c2/0x2070 kernel/bpf/syscall.c:1333
  __do_sys_bpf kernel/bpf/syscall.c:2073 [inline]
  __se_sys_bpf kernel/bpf/syscall.c:2035 [inline]
  __x64_sys_bpf+0x389/0x4c0 kernel/bpf/syscall.c:2035
  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007ffec3da2868 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000002542914 RCX: 0000000000455a09
RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000046 R14: 00000000006f4730 R15: 0000000000000023
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..