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(56e1e96c7e84ca84,0,ffffff007e785df0,ffff80000193d860,124) 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(95ff36e0d70320b1,ffffff007e55ad98,5,1,ffffff007e05b178) at VOP_ADVLOCK+0x74 sys/kern/vfs_vops.c:699 sys_flock(4153580b3e2796a2,830,ffff80002108abd0) at sys_flock+0x163 syscall(4ec7c936cf7d6616) at syscall+0x496 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(4ec7c936cf7d6616) at syscall+0x496 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffff4f,0,2,febf45b010) at Xsyscall+0x128 end of kernel end trace frame: 0x10196dad950, count: -6 ddb{1}> show registers rdi 0xdeafbeaddeafbead rsi 0xffffffff81b15b15 lf_findoverlap+0x95 rbp 0xffff80002115b610 rbx 0xdeafbeaddeafbead rdx 0xffff80000293f000 rcx 0x173e __ALIGN_SIZE+0x73e rax 0xffff80000293f000 r8 0xffff80002115b658 r9 0x1 r10 0x97f7848a5df4a48d r11 0xc4754bf363acb600 r12 0x2 r13 0xffffff007e785df0 r14 0xffff80002115b658 r15 0 rip 0xffffffff81b15b3b lf_findoverlap+0xbb cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002115b5b0 ss 0x10 lf_findoverlap+0xbb: movq 0x18(%rbx),%rax ddb{1}> show proc PROC (syz-executor1) pid=164778 stat=onproc flags process=0 proc=4000000 pri=36, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff80002108b530,0xffff80002108a028 process=0xffff8000210646a0 user=0xffff800021156000, vmspace=0xffffff007f124d68 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33984 2970 24765 0 2 0 syz-executor0 33984 340236 24765 0 7 0x4000000 syz-executor0 33984 209779 24765 0 2 0x4000000 syz-executor0 8934 339830 23909 0 2 0 syz-executor1 * 8934 164778 23909 0 7 0x4000000 syz-executor1 8934 2823 23909 0 2 0x4000000 syz-executor1 3512 480289 1 0 3 0x100083 ttyin getty 87271 8532 0 0 3 0x14200 bored sosplice 23909 78878 52392 0 3 0x82 nanosleep syz-executor1 24765 383277 52392 0 3 0x82 nanosleep syz-executor0 52392 292637 43430 0 3 0x82 thrsleep syz-fuzzer 52392 8440 43430 0 3 0x4000082 thrsleep syz-fuzzer 52392 512130 43430 0 3 0x4000082 thrsleep syz-fuzzer 52392 332339 43430 0 3 0x4000082 thrsleep syz-fuzzer 52392 221328 43430 0 3 0x4000082 thrsleep syz-fuzzer 52392 147253 43430 0 3 0x4000082 thrsleep syz-fuzzer 52392 18584 43430 0 3 0x4000082 kqread syz-fuzzer 52392 55891 43430 0 3 0x4000082 thrsleep syz-fuzzer 52392 468481 43430 0 3 0x4000082 thrsleep syz-fuzzer 52392 498748 43430 0 3 0x4000082 thrsleep syz-fuzzer 43430 243117 12113 0 3 0x10008a pause ksh 12113 19610 13755 0 3 0x92 select sshd 13755 517370 1 0 3 0x80 select sshd 36568 334871 85418 73 3 0x100090 kqread syslogd 85418 329193 1 0 3 0x100082 netio syslogd 20132 311886 1 77 3 0x100090 poll dhclient 70418 367653 1 0 3 0x80 poll dhclient 37531 42706 0 0 2 0x14200 zerothread 29845 153891 0 0 3 0x14200 aiodoned aiodoned 65406 18609 0 0 3 0x14200 syncer update 57339 497232 0 0 3 0x14200 cleaner cleaner 93695 137889 0 0 3 0x14200 reaper reaper 74968 59713 0 0 3 0x14200 pgdaemon pagedaemon 84462 373092 0 0 3 0x14200 bored crynlk 21801 421947 0 0 3 0x14200 bored crypto 38988 155574 0 0 3 0x40014200 acpi0 acpi0 14113 231013 0 0 3 0x40014200 idle1 93707 432756 0 0 3 0x14200 bored softnet 46194 285488 0 0 3 0x14200 bored systqmp 65393 300854 0 0 3 0x14200 bored systq 98510 263660 0 0 3 0x40014200 bored softclock 49299 479894 0 0 3 0x40014200 idle0 1 63151 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper