kernel: protection fault trap, code=0 Stopped at lf_findoverlap+0xbb: movq 0x18(%rbx),%rax ddb{1}> ddb{1}> set $lines = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace lf_findoverlap(12d288c56b5ee2cf,0,ffffff007dade668,ffff8000042df560,124) at lf_findoverlap+0xbb sys/kern/vfs_lockf.c:621 lf_setlock() at lf_setlock+0xbc lf_getblock sys/kern/vfs_lockf.c:586 [inline] lf_setlock() at lf_setlock+0xbc sys/kern/vfs_lockf.c:314 VOP_ADVLOCK(d489d3aa27300d92,ffffff006fa8b258,8,1,ffffff0065f00eb8) at VOP_ADVLOCK+0x6e sys/kern/vfs_vops.c:699 sys_flock(c89f4c1d4739edf3,830,ffff80002108b530) at sys_flock+0x163 syscall(a8e6809c847ebdf2) at syscall+0x473 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(a8e6809c847ebdf2) at syscall+0x473 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffff4f,0,2,cdd400451a0) at Xsyscall+0x128 end of kernel end trace frame: 0xcdfba0add90, count: -6 ddb{1}> show registers rdi 0xdeaf4152deaf4152 rsi 0xffffffff8101e095 lf_findoverlap+0x95 rbp 0xffff800021153160 rbx 0xdeaf4152deaf4152 rdx 0xffff8000014d9000 rcx 0x7d1 rax 0xffff8000014d9000 r8 0xffff800021153198 r9 0x1 r10 0x1c2ba25e102d40e6 r11 0xed2d773aea5f3083 r12 0x2 r13 0xffffff007dade668 r14 0xffff800021153198 r15 0 rip 0xffffffff8101e0bb lf_findoverlap+0xbb cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800021153100 ss 0x10 lf_findoverlap+0xbb: movq 0x18(%rbx),%rax ddb{1}> show proc PROC (syz-executor0) pid=433221 stat=onproc flags process=10 proc=4000000 pri=36, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff80002108a720,0xffff80002108abe0 process=0xffff800021065708 user=0xffff80002114e000, vmspace=0xffffff0065830740 estcpu=23, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 988 8686 65376 65534 2 0x10 syz-executor0 988 99682 65376 65534 3 0x4000090 lockf syz-executor0 988 438064 65376 65534 7 0x4000010 syz-executor0 * 988 433221 65376 65534 7 0x4000010 syz-executor0 988 193636 65376 65534 2 0x4000010 syz-executor0 65376 305988 1383 65534 3 0x90 nanosleep syz-executor0 1383 118703 61791 0 3 0x82 wait syz-executor0 70643 172043 0 0 3 0x14200 bored sosplice 61791 380806 47351 0 3 0x82 thrsleep syz-fuzzer 61791 218301 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 286869 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 256946 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 430376 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 40533 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 114610 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 424814 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 359664 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 105063 47351 0 3 0x4000082 kqread syz-fuzzer 61791 424180 47351 0 3 0x4000082 thrsleep syz-fuzzer 61791 212665 47351 0 3 0x4000082 thrsleep syz-fuzzer 47351 280277 1755 0 3 0x10008a pause ksh 1755 78876 37869 0 3 0x92 select sshd 32332 222978 1 0 3 0x100083 ttyin getty 37869 173061 1 0 3 0x80 select sshd 1641 289919 58093 73 3 0x100090 kqread syslogd 58093 71395 1 0 3 0x100082 netio syslogd 35978 154583 1 77 3 0x100090 poll dhclient 8847 173751 1 0 3 0x80 poll dhclient 38521 185710 0 0 3 0x14200 pgzero zerothread 67062 276949 0 0 3 0x14200 aiodoned aiodoned 50600 283577 0 0 3 0x14200 syncer update 25306 238705 0 0 3 0x14200 cleaner cleaner 9537 241473 0 0 3 0x14200 reaper reaper 30934 69147 0 0 3 0x14200 pgdaemon pagedaemon 52781 452875 0 0 3 0x14200 bored crynlk 17160 339216 0 0 3 0x14200 bored crypto 87779 420140 0 0 3 0x40014200 acpi0 acpi0 61778 350748 0 0 3 0x40014200 idle1 74459 298401 0 0 3 0x14200 bored softnet 69386 346461 0 0 3 0x14200 bored systqmp 4549 11331 0 0 3 0x14200 bored systq 23762 448848 0 0 3 0x40014200 bored softclock 88781 163078 0 0 3 0x40014200 idle0 1 275511 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper