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verifier backtracking bug
WARNING: CPU: 0 PID: 1873 at kernel/bpf/verifier.c:1783 __mark_chain_precision+0x197a/0x1ea0 kernel/bpf/verifier.c:1783
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 1873 Comm: syz-executor.5 Not tainted 5.3.0-rc6-next-20190830 #75
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2dc/0x755 kernel/panic.c:220
 __warn.cold+0x2f/0x3c kernel/panic.c:581
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:__mark_chain_precision+0x197a/0x1ea0 kernel/bpf/verifier.c:1783
Code: 08 31 ff 89 de e8 e6 9e f2 ff 84 db 0f 85 07 ff ff ff e8 99 9d f2 ff 48 c7 c7 c0 8b b1 87 c6 05 9d e1 41 08 01 e8 ee eb c3 ff <0f> 0b 41 bc f2 ff ff ff e9 e8 fe ff ff 48 8b bd d8 fe ff ff e8 fd
RSP: 0018:ffff888056f57380 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000009c98 RSI: ffffffff815bf786 RDI: ffffed100adeae62
RBP: ffff888056f574d0 R08: ffff8880958f2680 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880a3cce000 R14: ffff88805be1c000 R15: ffff888056f57468
 mark_chain_precision kernel/bpf/verifier.c:1820 [inline]
 check_cond_jmp_op+0xcd8/0x3c30 kernel/bpf/verifier.c:5842
 do_check+0x63cd/0x8a30 kernel/bpf/verifier.c:7784
 bpf_check+0x6fff/0x99c0 kernel/bpf/verifier.c:9298
 bpf_prog_load+0xe68/0x1660 kernel/bpf/syscall.c:1709
 __do_sys_bpf+0xa44/0x3350 kernel/bpf/syscall.c:2866
 __se_sys_bpf kernel/bpf/syscall.c:2825 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2825
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe078385c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9
RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe0783866d4
R13: 00000000004bfd15 R14: 00000000004d1a58 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..