uvm_fault(0xffffffff839f0190, 0xffff800021c72004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_lookup+0x623: movzwl 0x4(%r15,%r14,1),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND 29922 74465 0 0 0 0 syz-executor *244709 74465 0 0 0x4000000 1K syz-executor ufs_lookup() at ufs_lookup+0x623 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806f177020,ffff80003c3e8830,ffff80003c3e8860) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80003c3e8800) at vfs_lookup+0x937 sys/kern/vfs_lookup.c:580 namei(ffff80003c3e8800) at namei+0x7c5 sys/kern/vfs_lookup.c:250 dofchownat(ffff80002a220018,ffffff9c,200000000200,0,0,0) at dofchownat+0xe7 sys/kern/vfs_syscalls.c:2513 syscall(ffff80003c3e8aa0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e8aa0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3a7863887d0, count: 8 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff839f0190, 0xffff800021c72004, 0, 1) -> d ddb{1}> trace ufs_lookup() at ufs_lookup+0x623 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806f177020,ffff80003c3e8830,ffff80003c3e8860) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80003c3e8800) at vfs_lookup+0x937 sys/kern/vfs_lookup.c:580 namei(ffff80003c3e8800) at namei+0x7c5 sys/kern/vfs_lookup.c:250 dofchownat(ffff80002a220018,ffffff9c,200000000200,0,0,0) at dofchownat+0xe7 sys/kern/vfs_syscalls.c:2513 syscall(ffff80003c3e8aa0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e8aa0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3a7863887d0, count: -7 ddb{1}> show registers rdi 0 rsi 0x2 rbp 0xffff80003c3e8630 rbx 0 rdx 0xffff800000045880 rcx 0xffff80002a220018 rax 0xffff80002999dff0 r8 0xffffffffffffffff r9 0xfffffd80097fd618 r10 0x19eea984968c82f3 r11 0x86d5040a793729d1 r12 0xfffffd805edd3148 r13 0 r14 0 r15 0xffff800021c72000 rip 0xffffffff8236a6d3 ufs_lookup+0x623 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c3e8540 ss 0x10 ufs_lookup+0x623: movzwl 0x4(%r15,%r14,1),%ebx ddb{1}> show proc PROC (syz-executor) tid=244709 pid=74465 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a220d10,0xffffffff83ab18e0 process=0xffff8000fffe09c8 user=0xffff80003c3e3000, vmspace=0xfffffd800dd859a8 estcpu=32, cpticks=4, pctcpu=0.3, user=0, sys=4, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74465 29922 91019 0 7 0 syz-executor *74465 244709 91019 0 7 0x4000000 syz-executor 92131 87187 21608 0 3 0x80 nanoslp syz-executor 92131 124877 21608 0 3 0x4000080 sbwait syz-executor 92131 367115 21608 0 3 0x4000080 fsleep syz-executor 70619 159858 40818 0 3 0x80 nanoslp syz-executor 70619 116995 40818 0 3 0x4000080 nanoslp syz-executor 70619 440847 40818 0 3 0x4000080 fsleep syz-executor 91730 247520 0 0 3 0x14280 nfsidl nfsio 91773 433048 0 0 3 0x14280 nfsidl nfsio 27722 430083 0 0 3 0x14280 nfsidl nfsio 2001 328060 0 0 3 0x14280 nfsidl nfsio 41251 77228 0 0 3 0x14280 nfsidl nfsio 5561 394906 0 0 3 0x14280 nfsidl nfsio 61643 376294 0 0 3 0x14280 nfsidl nfsio 66867 456102 0 0 3 0x14280 nfsidl nfsio 80959 80724 0 0 3 0x14280 nfsidl nfsio 32491 176752 0 0 3 0x14280 nfsidl nfsio 62270 141848 0 0 3 0x14280 nfsidl nfsio 50806 471127 0 0 3 0x14280 nfsidl nfsio 83560 204714 0 0 3 0x14280 nfsidl nfsio 87914 342207 0 0 3 0x14280 nfsidl nfsio 96924 344033 0 0 3 0x14280 nfsidl nfsio 36248 263565 0 0 3 0x14280 nfsidl nfsio 82632 244942 0 0 3 0x14280 nfsidl nfsio 15280 162581 0 0 3 0x14280 nfsidl nfsio 39968 389657 0 0 3 0x14280 nfsidl nfsio 24813 197445 0 0 3 0x14280 nfsidl nfsio 40818 254534 2169 0 3 0x82 nanoslp syz-executor 63444 148014 2169 0 3 0x82 wait syz-executor 91019 472615 2169 0 3 0x82 nanoslp syz-executor 21608 494451 2169 0 3 0x82 nanoslp syz-executor 2169 347409 1 0 3 0x82 wait syz-executor 79463 79759 0 0 3 0x14200 bored smr 12098 288237 0 0 3 0x14200 pgzero zerothread 88620 402021 0 0 3 0x14200 aiodoned aiodoned 45059 82998 0 0 3 0x14200 syncer update 16039 440325 0 0 3 0x14200 cleaner cleaner 94195 147956 0 0 3 0x14200 reaper reaper 7912 478208 0 0 3 0x14200 pgdaemon pagedaemon 16241 72687 0 0 3 0x14200 bored viomb 11914 22009 0 0 3 0x40014200 acpi0 acpi0 34014 24632 0 0 3 0x40014200 idle1 11126 364099 0 0 3 0x14200 bored softnet1 14864 233221 0 0 3 0x14200 bored softnet0 28852 385890 0 0 3 0x14200 bored systqmp 70751 90283 0 0 3 0x14200 bored systq 94252 276304 0 0 3 0x14200 tmoslp softclockmp 49296 174288 0 0 3 0x40014200 tmoslp softclock 82541 299102 0 0 3 0x40014200 idle0 1 349689 0 0 4 0x58080082 init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 74465 (syz-executor) thread 0xffff80002a220018 (244709) exclusive rrwlock inode r = 0 (0xfffffd8074336360) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x10f sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 dofchownat+0xe7 sys/kern/vfs_syscalls.c:2513 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839dbe40) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11084 12105K 13931K 166960K 13232 0 pcb 18 15K 16K 166960K 234 0 rtable 217 7K 8K 166960K 465 0 pf 36 18K 25K 166960K 140 0 ifaddr 39 6K 8K 166960K 72 0 ifgroup 54 2K 2K 166960K 112 0 sysctl 4 1K 9K 166960K 9 0 counters 68 36K 37K 166960K 118 0 ioctlops 0 0K 4K 166960K 1846 0 iov 0 0K 16K 166960K 19 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1445 91K 91K 166960K 2117 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 118 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 13 49K 93K 166960K 780 0 sigio 0 0K 0K 166960K 14 0 proc 12 17K 164K 166960K 641 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 90 0 in_multi 88 6K 7K 166960K 132 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 23 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 520 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 119 87K 186K 166960K 8942 0 UVM aobj 24 2K 2K 166960K 24 0 pinsyscall 14 28K 106K 166960K 1983 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 32 0 NDP 13 0K 1K 166960K 46 0 temp 56 9119K 12966K 166960K 41555 0 kqueue 2 4K 30K 166960K 142 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}>