uvm_fault(0xfffffd806c9ae180, 0x70, 0, 1) -> e kernel: page fault trap, code=0 Stopped at sys_lchown+0xe0: movl 0x70(%rax),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND *195802 54971 0 0 0x4000000 0 syz-executor sys_lchown(ffff80003c943cb8,ffff80003cafd910,ffff80003cafd860) at sys_lchown+0xe0 sys/kern/vfs_syscalls.c:2537 syscall(ffff80003cafd910) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003cafd910) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc9a8db21ff0, count: 12 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xfffffd806c9ae180, 0x70, 0, 1) -> e ddb> trace sys_lchown(ffff80003c943cb8,ffff80003cafd910,ffff80003cafd860) at sys_lchown+0xe0 sys/kern/vfs_syscalls.c:2537 syscall(ffff80003cafd910) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003cafd910) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc9a8db21ff0, count: -3 ddb> show registers rdi 0xffff80003850a000 rsi 0x6cf rbp 0xffff80003cafd840 rbx 0 rdx 0xffff80003850a000 rcx 0x6ce rax 0 r8 0xa0 r9 0 r10 0x74755b6b0e2fb45a r11 0x4cb26657b9a15b8c r12 0 r13 0 r14 0xffff80003c943cb8 r15 0xfffffd8068a08e78 rip 0xffffffff8103bd60 sys_lchown+0xe0 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003cafd690 ss 0x10 sys_lchown+0xe0: movl 0x70(%rax),%ebx ddb> show proc PROC (syz-executor) tid=195802 pid=54971 tcnt=5 stat=onproc flags process=0 proc=4000000 runpri=8, usrpri=86, slppri=8, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000334f9778,0xffff80003c943268 process=0xffff8000ffff0da0 user=0xffff80003caf8000, vmspace=0xfffffd806c9ae180 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 52540 287933 92804 0 2 0 syz-executor 52540 405982 92804 0 3 0x4000080 fsleep syz-executor 82254 444430 19135 0 2 0 syz-executor 82254 491843 19135 0 3 0x4000080 fsleep syz-executor 82254 77325 19135 0 3 0x4000080 fsleep syz-executor 87161 324768 99671 0 2 0 syz-executor 87161 500613 99671 0 3 0x4000080 fsleep syz-executor 65936 24405 14711 0 2 0 syz-executor 65936 40179 14711 0 3 0x4000080 fsleep syz-executor 71252 460108 56135 0 2 0 syz-executor 71252 116609 56135 0 3 0x4000080 piperd syz-executor 16177 448427 2143 60929 2 0x10 syz-executor 16177 54607 2143 60929 2 0x4000010 syz-executor 16177 422901 2143 60929 2 0x4000010 syz-executor 54971 380723 50313 0 3 0x80 nanoslp syz-executor 54971 146820 50313 0 3 0x4000080 fsleep syz-executor *54971 195802 50313 0 7 0x4000000 syz-executor 54971 369968 50313 0 3 0x4000080 fsleep syz-executor 54971 218387 50313 0 3 0x4000080 fsleep syz-executor 51109 145264 0 0 3 0x14280 nfsidl nfsio 78283 285255 0 0 3 0x14280 nfsidl nfsio 20902 520247 0 0 3 0x14280 nfsidl nfsio 80260 185911 0 0 3 0x14280 nfsidl nfsio 77280 311970 0 0 3 0x14280 nfsidl nfsio 68592 196494 0 0 3 0x14280 nfsidl nfsio 38906 126341 0 0 3 0x14280 nfsidl nfsio 45750 468589 0 0 3 0x14280 nfsidl nfsio 52212 325913 0 0 3 0x14280 nfsidl nfsio 90825 228022 0 0 3 0x14280 nfsidl nfsio 71706 436979 0 0 3 0x14280 nfsidl nfsio 22408 472873 0 0 3 0x14280 nfsidl nfsio 95548 176172 0 0 3 0x14280 nfsidl nfsio 27955 157061 0 0 3 0x14280 nfsidl nfsio 1063 499072 0 0 3 0x14280 nfsidl nfsio 51084 106368 0 0 3 0x14280 nfsidl nfsio 80245 134255 0 0 3 0x14280 nfsidl nfsio 21061 53640 0 0 3 0x14280 nfsidl nfsio 98646 274260 0 0 3 0x14280 nfsidl nfsio 94355 20540 0 0 3 0x14280 nfsidl nfsio 14711 319959 94751 0 3 0x82 nanoslp syz-executor 50313 242628 94751 0 3 0x82 nanoslp syz-executor 92804 164513 94751 0 3 0x82 nanoslp syz-executor 82695 365617 94751 0 3 0x82 wait syz-executor 56135 279439 94751 0 3 0x82 nanoslp syz-executor 99671 258829 94751 0 3 0x82 nanoslp syz-executor 19135 428677 94751 0 3 0x82 nanoslp syz-executor 2143 253465 94751 0 3 0x82 nanoslp syz-executor 94751 107154 40966 0 3 0x82 kqread syz-executor 40966 467771 71593 0 3 0x10008a sigsusp ksh 71593 423124 34102 0 3 0x98 kqread sshd-session 34102 78585 98759 0 3 0x92 kqread sshd-session 77773 366233 1 0 3 0x100083 ttyin getty 98759 337618 1 0 3 0x88 kqread sshd 84444 465019 35103 73 3 0x1100090 kqread syslogd 35103 370590 1 0 3 0x100082 sbwait syslogd 88796 242442 1 0 3 0x100080 kqread resolvd 40703 232713 99768 77 3 0x100092 kqread dhcpleased 13344 343225 99768 77 3 0x100092 kqread dhcpleased 99768 197029 1 0 3 0x80 kqread dhcpleased 69285 522607 0 0 3 0x14200 bored smr 89903 117657 0 0 2 0x14200 zerothread 47756 150732 0 0 3 0x14200 aiodoned aiodoned 49552 78289 0 0 3 0x14200 syncer update 26404 107601 0 0 3 0x14200 cleaner cleaner 58265 22620 0 0 3 0x14200 reaper reaper 42429 26963 0 0 3 0x14200 pgdaemon pagedaemon 33025 477403 0 0 3 0x14200 bored viomb 29808 226096 0 0 3 0x40014200 acpi0 acpi0 13992 325095 0 0 3 0x14200 bored softnet0 17944 422334 0 0 3 0x14200 bored systqmp 48722 43182 0 0 3 0x14200 bored systq 68045 472820 0 0 3 0x40014200 tmoslp softclock 56036 390131 0 0 3 0x40014200 idle0 1 483113 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11030 12099K 12372K 166960K 12387 0 pcb 18 12K 12K 166960K 46 0 rtable 246 7K 8K 166960K 372 0 pf 29 12K 13K 166960K 42 0 ifaddr 42 7K 7K 166960K 52 0 ifgroup 47 1K 2K 166960K 62 0 sysctl 1 1K 9K 166960K 6 0 counters 33 17K 18K 166960K 43 0 ioctlops 0 0K 4K 166960K 49 0 iov 1 1K 4K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1341 84K 85K 166960K 1476 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 269 0 proc 60 59K 116K 166960K 487 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 17 0 in_multi 99 7K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 731 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 243 151K 164K 166960K 4232 0 UVM aobj 7 4K 6K 166960K 8 0 pinsyscall 39 78K 95K 166960K 1342 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 11 0K 2K 166960K 33 0 temp 37 8658K 8724K 166960K 4408 0 kqueue 13 20K 28K 166960K 44 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 47 0 44 1 0 1 1 0 8 0 rtentry 136 113 0 1 4 0 4 4 0 8 0 unpcb 144 167 0 111 3 0 3 3 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 114 0 110 8 1 7 7 0 8 6 arp 96 19 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 1 1 0 1 1 0 8 0 inpcb 328 221 0 212 7 0 7 7 0 8 6 ip6q 72 3 0 2 1 0 1 1 0 8 0 ip6af 40 5 0 4 1 0 1 1 0 8 0 nd6 112 25 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 10 0 10 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 455 0 0 29 0 29 29 0 8 0 art_table 40 456 0 0 5 0 5 5 0 8 0 art_node 32 113 0 11 1 0 1 1 0 8 0 semapl 112 3 0 1 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1805 0 302 95 0 95 95 0 8 0 ffsino 256 1805 0 302 95 0 95 95 0 8 0 nchpl 144 2188 0 494 63 0 63 63 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 vnodes 216 1950 0 0 109 0 109 109 0 8 0 namei 1024 7266 0 7265 1 0 1 1 0 8 0 vcpupl 3904 1 0 0 1 0 1 1 0 8 0 vmpool 808 1 0 0 1 0 1 1 0 8 0 kstatmem 264 34 0 12 2 0 2 2 0 8 0 scxspl 216 7220 0 7220 2 1 1 2 1 8 1 plimitpl 152 51 0 35 1 0 1 1 0 8 0 sigapl 424 576 0 513 9 1 8 8 0 8 0 knotepl 120 8097 0 8050 16 7 9 9 0 8 7 kqueuepl 184 129 0 120 4 0 4 4 0 8 3 pipepl 304 155 0 94 5 0 5 5 0 8 0 fdescpl 448 543 0 513 5 1 4 5 0 8 0 filepl 120 2704 0 2381 15 0 15 15 0 8 4 lockfpl 104 28 0 25 1 0 1 1 0 8 0 lockfspl 48 15 0 12 1 0 1 1 0 8 0 sessionpl 144 22 0 14 1 0 1 1 0 8 0 pgrppl 48 33 0 17 1 0 1 1 0 8 0 ucredpl 104 234 0 222 1 0 1 1 0 8 0 zombiepl 144 561 0 560 1 0 1 1 0 8 0 processpl 1152 576 0 513 5 0 5 5 0 8 0 procpl 664 810 0 735 7 0 7 7 0 8 0 sockpl 552 443 0 375 10 0 10 10 0 8 4 mcl64k 65536 8 0 8 2 1 1 1 0 8 1 mcl8k 8192 7 0 7 2 1 1 1 0 8 1 mcl4k 4096 2626 0 2575 15 7 8 14 0 8 0 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 374 0 373 5 4 1 4 0 8 0 mtagpl 96 6 0 5 1 0 1 1 0 8 0 mbufpl 256 5646 0 5475 14 1 13 14 0 8 0 bufpl 280 2739 0 126 187 0 187 187 0 8 0 anonpl 24 97400 0 94240 32 0 32 32 0 187 5 amapchunkpl 152 12383 0 11866 26 0 26 26 0 158 4 amappl16 200 1296 0 1272 4 1 3 4 0 8 0 amappl15 192 32 0 32 1 1 0 1 0 8 0 amappl14 184 7 0 7 1 1 0 1 0 8 0 amappl13 176 402 0 401 1 0 1 1 0 8 0 amappl12 168 884 0 845 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 38 0 28 1 0 1 1 0 8 0 amappl9 144 268 0 268 1 1 0 1 0 8 0 amappl8 136 19 0 18 1 0 1 1 0 8 0 amappl7 128 93 0 92 1 0 1 1 0 8 0 amappl6 120 279 0 268 1 0 1 1 0 8 0 amappl5 112 66 0 59 1 0 1 1 0 8 0 amappl4 104 375 0 352 1 0 1 1 0 8 0 amappl3 96 2015 0 1919 3 0 3 3 0 8 0 amappl2 88 659 0 588 2 0 2 2 0 8 0 amappl1 80 9498 0 8956 14 1 13 14 0 8 0 amappl 88 3514 0 3339 6 1 5 5 0 92 0 uvmvnodes 80 99 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 543 0 513 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 543 0 513 1 0 1 1 0 8 0 vmmpekpl 168 6208 0 6173 2 0 2 2 0 8 0 vmmpepl 168 41498 0 39675 85 4 81 85 0 357 1 vmsppl 368 542 0 513 4 1 3 4 0 8 0 rwobjpl 40 14052 0 13096 11 0 11 11 0 8 0 pdppl 4096 1095 0 1027 99 31 68 83 0 8 0 pvpl 32 246295 0 237794 103 9 94 94 0 265 17 pmappl 216 543 0 513 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 383 0 51 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace sys_lchown(ffff80003c943cb8,ffff80003cafd910,ffff80003cafd860) at sys_lchown+0xe0 sys/kern/vfs_syscalls.c:2537 syscall(ffff80003cafd910) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003cafd910) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc9a8db21ff0, count: -3 ddb> machine ddbcpu 1 No such command ddb> trace sys_lchown(ffff80003c943cb8,ffff80003cafd910,ffff80003cafd860) at sys_lchown+0xe0 sys/kern/vfs_syscalls.c:2537 syscall(ffff80003cafd910) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003cafd910) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc9a8db21ff0, count: -3