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(8adfe08f943b6357,0,ffffff0066a5b7e8,ffff8000042df1a0,128) 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(6a61b25ea85213ee,ffffff0071ffc078,5,2,ffffff007c140208) at VOP_ADVLOCK+0x6e sys/kern/vfs_vops.c:699 sys_flock(b5331b7d79c93a9,830,ffff8000210632d8) at sys_flock+0x163 syscall(d6229118ce412f94) at syscall+0x473 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(d6229118ce412f94) at syscall+0x473 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffff4f,0,2,2de7d6a30d8) at Xsyscall+0x128 end of kernel end trace frame: 0x2e146394b80, count: -6 ddb{1}> show registers rdi 0xdeaf4152deaf4152 rsi 0xffffffff8157a465 lf_findoverlap+0x95 rbp 0xffff80002114d4e0 rbx 0xdeaf4152deaf4152 rdx 0xffff8000014d9000 rcx 0x12e6 __ALIGN_SIZE+0x2e6 rax 0xffff8000014d9000 r8 0xffff80002114d518 r9 0x1 r10 0x7ebe64e3890fb69b r11 0xc00a8d8ba5b1678e r12 0x2 r13 0xffffff0066a5b7e8 r14 0xffff80002114d518 r15 0 rip 0xffffffff8157a48b lf_findoverlap+0xbb cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002114d480 ss 0 lf_findoverlap+0xbb: movq 0x18(%rbx),%rax ddb{1}> show proc PROC (syz-executor0) pid=170584 stat=onproc flags process=10 proc=4000000 pri=40, usrpri=76, nice=20 forw=0xffffffffffffffff, list=0xffff800021063c38,0xffff800021062730 process=0xffff80002109ad38 user=0xffff800021148000, vmspace=0xffffff006593c848 estcpu=26, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91198 156033 77543 65534 2 0x10 syz-executor0 91198 514205 77543 65534 3 0x4000090 lockf syz-executor0 *91198 170584 77543 65534 7 0x4000010 syz-executor0 91198 95489 77543 65534 3 0x4000090 lockf syz-executor0 91198 381853 77543 65534 7 0x4000010 syz-executor0 91198 364224 77543 65534 2 0x4000010 syz-executor0 77543 43427 57359 65534 3 0x90 nanosleep syz-executor0 57359 370404 92738 0 3 0x82 wait syz-executor0 50219 55715 0 0 3 0x14200 bored sosplice 92738 60798 29782 0 3 0x82 thrsleep syz-fuzzer 92738 441200 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 435510 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 146770 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 201199 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 88437 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 191794 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 449210 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 32786 29782 0 3 0x4000082 kqread syz-fuzzer 92738 427461 29782 0 3 0x4000082 thrsleep syz-fuzzer 92738 161145 29782 0 3 0x4000082 thrsleep syz-fuzzer 29782 424795 98543 0 3 0x10008a pause ksh 98543 307541 80808 0 3 0x92 select sshd 93645 112471 1 0 3 0x100083 ttyin getty 80808 367784 1 0 3 0x80 select sshd 59141 303519 29295 73 3 0x100090 kqread syslogd 29295 491187 1 0 3 0x100082 netio syslogd 25355 188950 1 77 3 0x100090 poll dhclient 72295 141929 1 0 3 0x80 poll dhclient 44551 363635 0 0 3 0x14200 pgzero zerothread 14668 334661 0 0 3 0x14200 aiodoned aiodoned 12770 438840 0 0 3 0x14200 syncer update 92752 311376 0 0 3 0x14200 cleaner cleaner 16939 354920 0 0 3 0x14200 reaper reaper 1986 122976 0 0 3 0x14200 pgdaemon pagedaemon 10244 26286 0 0 3 0x14200 bored crynlk 11202 285337 0 0 3 0x14200 bored crypto 61582 266410 0 0 3 0x40014200 acpi0 acpi0 58900 281963 0 0 3 0x40014200 idle1 65542 100747 0 0 3 0x14200 bored softnet 36451 240050 0 0 3 0x14200 bored systqmp 41117 128300 0 0 3 0x14200 bored systq 24089 24697 0 0 3 0x40014200 bored softclock 32545 469023 0 0 3 0x40014200 idle0 1 298234 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper