Hello,
syzbot found the following crash on:
HEAD commit: e5a3e259 Merge branch 'bpf-tcp-rtt-hook'
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14190c2da00000
kernel config: https://syzkaller.appspot.com/x/.config?x=dd16b8dc9d0d210c
dashboard link: https://syzkaller.appspot.com/bug?extid=4da3ff23081bafe74fc2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1409ce0da00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17226a0da00000
The bug was bisected to:
commit b53119f13a04879c3bf502828d99d13726639ead
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Thu Mar 7 01:22:54 2019 +0000
pin iocb through aio.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11427b8ba00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=13427b8ba00000
console output: https://syzkaller.appspot.com/x/log.txt?x=15427b8ba00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4da3ff23081bafe74fc2@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b53119f13a04 ("pin iocb through aio.")
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verifier backtracking bug
WARNING: CPU: 0 PID: 9104 at kernel/bpf/verifier.c:1785
__mark_chain_precision+0x19bb/0x1ee0 kernel/bpf/verifier.c:1785
Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9104 Comm: syz-executor284 Not tainted 5.2.0-rc5+ #34Hardware 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+0x2cb/0x744 kernel/panic.c:219 __warn.cold+0x20/0x4d kernel/panic.c:576 report_bug+0x263/0x2b0 lib/bug.c:186 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+0x14/0x20 arch/x86/entry/entry_64.S:986 RIP: 0010:__mark_chain_precision+0x19bb/0x1ee0 kernel/bpf/verifier.c:1785Code: 08 31 ff 89 de e8 95 ba f2 ff 84 db 0f 85 ce fe ff ff e8 48 b9 f2 ff 48 c7 c7 e0 44 91 87 c6 05 1c 15 1f 08 01 e8 03 f1 c4 ff <0f> 0b 41 bc f2 ff ff ff e9 af fe ff ff e8 d3 3c 2c 00 e9 c2 e7 ff
RSP: 0018:ffff88809f04f380 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815ad926 RDI: ffffed1013e09e62 RBP: ffff88809f04f4d0 R08: ffff88809987a540 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88809af0c280 R14: 0000000000000001 R15: ffff88809f65cb00 mark_chain_precision kernel/bpf/verifier.c:1822 [inline] check_cond_jmp_op+0xcd8/0x3c30 kernel/bpf/verifier.c:5842 do_check+0x60f4/0x8a20 kernel/bpf/verifier.c:7782 bpf_check+0x6f99/0x9950 kernel/bpf/verifier.c:9293 bpf_prog_load+0xe68/0x1670 kernel/bpf/syscall.c:1698 __do_sys_bpf+0xa20/0x42d0 kernel/bpf/syscall.c:2849 __se_sys_bpf kernel/bpf/syscall.c:2808 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2808 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440369Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffca85a2fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
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