kernel: protection fault trap, code=0 Stopped at lf_findoverlap+0xab: 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(0,ffffff0070ab5968,ffff8000018d7de0,128,0) 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(ffffff0060e8be28,6,2,ffffff0068001298,ffffff006e927500) at VOP_ADVLOCK+0x61 sys/kern/vfs_vops.c:699 sys_flock(830,ffff8000210a2978,0) 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,0,2,363f4c5e0d8) at Xsyscall+0x128 end of kernel end trace frame: 0x36639d4dfa0, count: -6 ddb{1}> show registers rdi 0xdeaf4152deaf4152 rsi 0xffffffff813c1445 lf_findoverlap+0x85 rbp 0xffff8000211cadf0 rbx 0xdeaf4152deaf4152 rdx 0xffff800001ad9000 rcx 0x34c rax 0xffff800001ad9000 r8 0xffff8000211cae30 r9 0x1 r10 0x482fff48ed639f8e r11 0xffff8000210a3788 r12 0x2 r13 0xffffff0070ab5968 r14 0xffff8000211cae30 r15 0 rip 0xffffffff813c146b lf_findoverlap+0xab cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff8000211cada0 ss 0x10 lf_findoverlap+0xab: movq 0x18(%rbx),%rax ddb{1}> show proc PROC (syz-executor1) pid=320531 stat=onproc flags process=10 proc=4000000 pri=40, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff8000210a2270,0xffff8000210a2730 process=0xffff8000210b6338 user=0xffff8000211c6000, vmspace=0xffffff006598db60 estcpu=32, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 42405 196808 36236 65534 2 0x10 syz-executor1 42405 149019 36236 65534 3 0x4000090 lockf syz-executor1 *42405 320531 36236 65534 7 0x4000010 syz-executor1 42405 292056 36236 65534 7 0x4000010 syz-executor1 42405 511411 36236 65534 3 0x4000090 fsleep syz-executor1 42405 411743 36236 65534 2 0x4000010 syz-executor1 36236 492638 91352 65534 3 0x90 nanosleep syz-executor1 91352 423220 43342 0 3 0x82 wait syz-executor1 17502 403108 37392 65534 3 0x90 piperd syz-executor0 37392 308490 43342 0 3 0x82 wait syz-executor0 69634 142088 0 0 3 0x14200 bored sosplice 43342 265685 57643 0 3 0x82 kqread syz-fuzzer 43342 368688 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 12984 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 268956 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 296703 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 411518 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 245850 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 75824 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 211105 57643 0 3 0x4000082 thrsleep syz-fuzzer 43342 405640 57643 0 3 0x4000082 thrsleep syz-fuzzer 57643 94316 97749 0 3 0x10008a pause ksh 97749 306768 12507 0 3 0x92 select sshd 31341 436648 1 0 3 0x100083 ttyin getty 12507 127754 1 0 3 0x80 select sshd 51817 235578 43933 73 3 0x100090 kqread syslogd 43933 48177 1 0 3 0x100082 netio syslogd 34321 456281 1 77 3 0x100090 poll dhclient 75991 55448 1 0 3 0x80 poll dhclient 26723 457915 0 0 2 0x14200 zerothread 83883 9856 0 0 3 0x14200 aiodoned aiodoned 80256 499773 0 0 3 0x14200 syncer update 56218 374986 0 0 3 0x14200 cleaner cleaner 396 408408 0 0 3 0x14200 reaper reaper 80972 515075 0 0 3 0x14200 pgdaemon pagedaemon 73456 121064 0 0 3 0x14200 bored crynlk 85145 426497 0 0 3 0x14200 bored crypto 56299 356863 0 0 3 0x40014200 acpi0 acpi0 76908 449326 0 0 3 0x40014200 idle1 96139 452117 0 0 3 0x14200 bored softnet 82440 187586 0 0 3 0x14200 bored systqmp 97988 218825 0 0 3 0x14200 bored systq 18274 257555 0 0 3 0x40014200 bored softclock 25065 488610 0 0 3 0x40014200 idle0 1 228019 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper