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(54863be02ce13231,0,ffffff007e289ec0,ffff8000040dfe60,128) 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(273f8b133029ab5a,ffffff007e3a5348,7,2,ffffff0065b49338) at VOP_ADVLOCK+0x6e sys/kern/vfs_vops.c:699 sys_flock(d40941b838e24811,830,ffff800021072270) at sys_flock+0x163 syscall(282951595a3880c5) at syscall+0x473 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(282951595a3880c5) at syscall+0x473 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffff4f,0,2,ade098b50d8) at Xsyscall+0x128 end of kernel end trace frame: 0xae0d8407920, count: -6 ddb{1}> show registers rdi 0xdeaf4152deaf4152 rsi 0xffffffff812e35d5 lf_findoverlap+0x95 rbp 0xffff80002113ce10 rbx 0xdeaf4152deaf4152 rdx 0xffff8000018da000 rcx 0x18d rax 0xffff8000018da000 r8 0xffff80002113ce48 r9 0x1 r10 0x8f2fc8076bebfd84 r11 0x5f7f638bc8f6844d r12 0x2 r13 0xffffff007e289ec0 r14 0xffff80002113ce48 r15 0 rip 0xffffffff812e35fb lf_findoverlap+0xbb cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002113cdb0 ss 0x10 lf_findoverlap+0xbb: movq 0x18(%rbx),%rax ddb{1}> show proc PROC (syz-executor1) pid=479040 stat=onproc flags process=10 proc=4000000 pri=40, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021073c38,0xffff8000210732e8 process=0xffff800021074d30 user=0xffff800021138000, vmspace=0xffffff0074fac010 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 62097 206945 72652 65534 7 0x10 syz-executor1 62097 200654 72652 65534 3 0x4000090 fsleep syz-executor1 *62097 479040 72652 65534 7 0x4000010 syz-executor1 62097 155896 72652 65534 2 0x4000010 syz-executor1 72652 79711 37808 65534 3 0x90 nanosleep syz-executor1 37808 114462 36214 0 3 0x82 wait syz-executor1 27471 471535 18968 65534 3 0x90 nanosleep syz-executor0 18968 110933 36214 0 3 0x82 wait syz-executor0 53065 341390 0 0 3 0x14200 bored sosplice 36214 201817 33974 0 3 0x82 thrsleep syz-fuzzer 36214 116084 33974 0 3 0x4000082 nanosleep syz-fuzzer 36214 359111 33974 0 3 0x4000082 thrsleep syz-fuzzer 36214 432493 33974 0 3 0x4000082 kqread syz-fuzzer 36214 390098 33974 0 3 0x4000082 thrsleep syz-fuzzer 36214 403183 33974 0 3 0x4000082 thrsleep syz-fuzzer 36214 206401 33974 0 3 0x4000082 thrsleep syz-fuzzer 36214 38246 33974 0 3 0x4000082 thrsleep syz-fuzzer 36214 322903 33974 0 3 0x4000082 thrsleep syz-fuzzer 36214 472109 33974 0 3 0x4000082 thrsleep syz-fuzzer 36214 310832 33974 0 3 0x4000082 thrsleep syz-fuzzer 33974 431918 31543 0 3 0x10008a pause ksh 31543 343198 83906 0 3 0x92 select sshd 42655 281150 1 0 3 0x100083 ttyin getty 83906 243323 1 0 3 0x80 select sshd 47317 503483 3768 73 3 0x100090 kqread syslogd 3768 372954 1 0 3 0x100082 netio syslogd 98557 421408 1 77 3 0x100090 poll dhclient 272 329397 1 0 3 0x80 poll dhclient 38473 356810 0 0 3 0x14200 pgzero zerothread 35053 150220 0 0 3 0x14200 aiodoned aiodoned 27534 501808 0 0 3 0x14200 syncer update 14044 351213 0 0 3 0x14200 cleaner cleaner 62668 88719 0 0 3 0x14200 reaper reaper 91652 24777 0 0 3 0x14200 pgdaemon pagedaemon 84315 255910 0 0 3 0x14200 bored crynlk 52864 151905 0 0 3 0x14200 bored crypto 7462 4346 0 0 3 0x40014200 acpi0 acpi0 51004 296179 0 0 3 0x40014200 idle1 86605 217017 0 0 3 0x14200 bored softnet 81210 108757 0 0 3 0x14200 bored systqmp 64182 290348 0 0 3 0x14200 bored systq 78312 212979 0 0 3 0x40014200 bored softclock 15279 395812 0 0 3 0x40014200 idle0 1 78505 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper