kernel: protection fault trap, code=0
Stopped at lf_findoverlap+0xab: movq 0x18(%rbx),%rax
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
lf_findoverlap(0,ffffff0067db4600,ffff8000016d7460,128,0) at lf_findoverlap+0xab sys/kern/vfs_lockf.c:621
lf_setlock() at lf_setlock+0xac lf_getblock sys/kern/vfs_lockf.c:586 [inline]
lf_setlock() at lf_setlock+0xac sys/kern/vfs_lockf.c:314
VOP_ADVLOCK(ffffff0063d43810,5,2,ffffff007a6e10a8,ffffff007f7c6b98) at VOP_ADVLOCK+0x61 sys/kern/vfs_vops.c:699
sys_flock(830,ffff8000210d8018,0) at sys_flock+0x156
syscall(0) at syscall+0x466 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(0) at syscall+0x466 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,ffffffffffffff4f,0,2,be6b1ccb010) at Xsyscall+0x128
end of kernel
end trace frame: 0xbe95dd2d380, count: -6
ddb{0}> show registers
rdi 0xdeaf4152deaf4152
rsi 0xffffffff81905445 lf_findoverlap+0x85
rbp 0xffff800021177100
rbx 0xdeaf4152deaf4152
rdx 0xffff8000010d7000
rcx 0xfc
rax 0xffff8000010d7000
r8 0xffff800021177140
r9 0
r10 0x2ef171e5c3889eef
r11 0xffff8000210d99e0
r12 0x2
r13 0xffffff0067db4600
r14 0xffff800021177140
r15 0
rip 0xffffffff8190546b lf_findoverlap+0xab
cs 0x8
rflags 0x10202 __ALIGN_SIZE+0xf202
rsp 0xffff8000211770b0
ss 0x10
lf_findoverlap+0xab: movq 0x18(%rbx),%rax
ddb{0}> show proc
PROC (syz-executor1) pid=426524 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=40, usrpri=73, nice=20
forw=0xffffffffffffffff, list=0xffff8000210d8720,0xffff8000210d99f0
process=0xffff8000210a4d30 user=0xffff800021172000, vmspace=0xffffff0064994738
estcpu=23, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
1613 73381 48814 65534 2 0x10 syz-executor1
* 1613 426524 48814 65534 7 0x4000010 syz-executor1
1613 488086 48814 65534 2 0x4000010 syz-executor1
1613 339150 48814 65534 7 0x4000090 syz-executor1
2755 223816 48878 65534 3 0x90 piperd syz-executor0
48878 308541 53941 0 3 0x82 wait syz-executor0
48814 109172 13722 65534 3 0x90 nanosleep syz-executor1
13722 73561 53941 0 3 0x82 wait syz-executor1
74086 355916 0 0 3 0x14200 bored sosplice
53941 213886 26974 0 3 0x82 kqread syz-fuzzer
53941 201240 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 167440 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 96737 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 399387 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 208457 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 197892 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 304856 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 407695 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 308318 26974 0 3 0x4000082 thrsleep syz-fuzzer
53941 178452 26974 0 3 0x4000082 thrsleep syz-fuzzer
26974 387960 86566 0 3 0x10008a pause ksh
86566 407642 36790 0 3 0x92 select sshd
37550 406753 1 0 3 0x100083 ttyin getty
36790 375840 1 0 3 0x80 select sshd
18584 117842 19543 73 3 0x100090 kqread syslogd
19543 264198 1 0 3 0x100082 netio syslogd
86693 399785 1 77 3 0x100090 poll dhclient
85240 322865 1 0 3 0x80 poll dhclient
21216 4703 0 0 3 0x14200 pgzero zerothread
40153 122802 0 0 3 0x14200 aiodoned aiodoned
74604 406507 0 0 3 0x14200 syncer update
14402 171562 0 0 3 0x14200 cleaner cleaner
33045 279690 0 0 3 0x14200 reaper reaper
73142 135875 0 0 3 0x14200 pgdaemon pagedaemon
11310 79757 0 0 3 0x14200 bored crynlk
65094 413837 0 0 3 0x14200 bored crypto
19065 179047 0 0 3 0x40014200 acpi0 acpi0
63817 403493 0 0 3 0x40014200 idle1
81024 212470 0 0 3 0x14200 bored softnet
58003 264807 0 0 3 0x14200 bored systqmp
64779 59322 0 0 3 0x14200 bored systq
28266 99827 0 0 3 0x40014200 bored softclock
37331 49043 0 0 3 0x40014200 idle0
1 373112 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper