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(e0c017ef83df8df9,0,ffffff0065626208,ffff8000019e39a0,128) 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(c5ff8712dcc17d94,ffffff00608cf9d8,a,2,ffffff007b4e0488) at VOP_ADVLOCK+0x74 sys/kern/vfs_vops.c:699 sys_flock(774ce5644281561,830,ffff8000210632d8) at sys_flock+0x163 syscall(ae3dad31ddd25c3a) at syscall+0x496 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ae3dad31ddd25c3a) at syscall+0x496 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,ffffffffffffff4f,0,2,55f6ebf21a0) at Xsyscall+0x128 end of kernel end trace frame: 0x561e9e2f990, count: -6 ddb{1}> show registers rdi 0xdeaf4152deaf4152 rsi 0xffffffff81b15b15 lf_findoverlap+0x95 rbp 0xffff800021197860 rbx 0xdeaf4152deaf4152 rdx 0xffff800000d3b000 rcx 0x10e rax 0xffff800000d3b000 r8 0xffff8000211978a8 r9 0x1 r10 0xa8b9dad0ba671d83 r11 0x3d3f2bade7e6f9ee r12 0x2 r13 0xffffff0065626208 r14 0xffff8000211978a8 r15 0 rip 0xffffffff81b15b3b lf_findoverlap+0xbb cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800021197800 ss 0x10 lf_findoverlap+0xbb: movq 0x18(%rbx),%rax ddb{1}> show proc PROC (syz-executor0) pid=224968 stat=onproc flags process=0 proc=4000000 pri=40, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800021062720,0xffff800021063798 process=0xffff800021064358 user=0xffff800021192000, vmspace=0xffffff007f124d68 estcpu=29, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21939 245769 90031 0 2 0 syz-executor0 21939 119936 90031 0 3 0x4000080 lockf syz-executor0 21939 396208 90031 0 3 0x4000080 poll syz-executor0 *21939 224968 90031 0 7 0x4000000 syz-executor0 21939 429511 90031 0 2 0x4000000 syz-executor0 21939 208692 90031 0 7 0x4000080 syz-executor0 66527 361440 1 0 3 0x100083 ttyin getty 72521 106848 0 0 3 0x14200 bored sosplice 81903 140291 94217 0 3 0x82 piperd syz-executor1 90031 421674 94217 0 3 0x82 nanosleep syz-executor0 94217 203446 29081 0 3 0x82 kqread syz-fuzzer 94217 362249 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 64103 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 123627 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 471697 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 352158 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 381359 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 200033 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 294765 29081 0 3 0x4000082 thrsleep syz-fuzzer 94217 372828 29081 0 3 0x4000082 thrsleep syz-fuzzer 29081 238539 6722 0 3 0x10008a pause ksh 6722 431579 90752 0 3 0x92 select sshd 90752 71869 1 0 3 0x80 select sshd 21192 282271 8247 73 3 0x100090 kqread syslogd 8247 111775 1 0 3 0x100082 netio syslogd 72079 373851 1 77 3 0x100090 poll dhclient 88174 439784 1 0 3 0x80 poll dhclient 38034 266387 0 0 3 0x14200 pgzero zerothread 52627 144842 0 0 3 0x14200 aiodoned aiodoned 50929 383153 0 0 3 0x14200 syncer update 57008 252904 0 0 3 0x14200 cleaner cleaner 55952 45489 0 0 3 0x14200 reaper reaper 71479 515946 0 0 3 0x14200 pgdaemon pagedaemon 58609 70408 0 0 3 0x14200 bored crynlk 32954 176740 0 0 3 0x14200 bored crypto 46255 64990 0 0 3 0x40014200 acpi0 acpi0 24520 33064 0 0 3 0x40014200 idle1 20904 140921 0 0 3 0x14200 bored softnet 75761 223075 0 0 3 0x14200 bored systqmp 36061 323029 0 0 3 0x14200 bored systq 3605 271668 0 0 3 0x40014200 bored softclock 87521 387001 0 0 3 0x40014200 idle0 1 366637 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper