uvm_fault(0xffffffff838fce98, 0xffff8000288f2004, 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 138249 15593 0 0x100000 0 1 sh *475020 82797 0 0 0x4000000 0K syz-executor ufs_lookup() at ufs_lookup+0x623 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd807a732c30,ffff80002a361fc8,ffff80002a361ff8) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a361f98) at vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 namei(ffff80002a361f98) at namei+0x7ca sys/kern/vfs_lookup.c:250 sys_lchown(ffff80003a80a020,ffff80002a362220,ffff80002a362170) at sys_lchown+0x8b sys/kern/vfs_syscalls.c:2533 syscall(ffff80002a362220) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a362220) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4651d36200, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xffffffff838fce98, 0xffff8000288f2004, 0, 1) -> d ddb{0}> trace ufs_lookup() at ufs_lookup+0x623 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd807a732c30,ffff80002a361fc8,ffff80002a361ff8) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a361f98) at vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 namei(ffff80002a361f98) at namei+0x7ca sys/kern/vfs_lookup.c:250 sys_lchown(ffff80003a80a020,ffff80002a362220,ffff80002a362170) at sys_lchown+0x8b sys/kern/vfs_syscalls.c:2533 syscall(ffff80002a362220) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a362220) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4651d36200, count: -7 ddb{0}> show registers rdi 0 rsi 0x2 rbp 0xffff80002a361dd0 rbx 0 rdx 0xffff80000144dc80 rcx 0xffff80003a80a020 rax 0xffffffff83799ff0 cpu_info_full_primary+0x1ff0 r8 0xffffffffffffffff r9 0xfffffd80097fb750 r10 0x9fb02f778f76084c r11 0xbc5e66b222ad167b r12 0xfffffd8066779248 r13 0 r14 0 r15 0xffff8000288f2000 rip 0xffffffff81d272a3 ufs_lookup+0x623 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a361ce0 ss 0x10 ufs_lookup+0x623: movzwl 0x4(%r15,%r14,1),%ebx ddb{0}> show proc PROC (syz-executor) tid=475020 pid=82797 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003a80b248,0xffff80003a80bcb8 process=0xffff80002a3ce1c8 user=0xffff80002a35d000, vmspace=0xfffffd806b99c5d0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15593 138249 52773 0 7 0x100000 sh 52773 392149 66910 0 3 0x10008a sigsusp sh 27274 491314 35641 0 3 0x80 nanoslp syz-executor 27274 409341 35641 0 3 0x4000080 sbwait syz-executor 27274 336566 35641 0 3 0x4000080 fsleep syz-executor 22001 39656 33714 0 2 0 syz-executor 22001 295493 33714 0 3 0x4000080 fsleep syz-executor 22182 67438 39086 0 2 0 syz-executor 22182 197055 39086 0 3 0x4000080 fsleep syz-executor 22182 34468 39086 0 3 0x4000080 fsleep syz-executor 82797 278284 37741 0 2 0 syz-executor *82797 475020 37741 0 7 0x4000000 syz-executor 82797 441097 37741 0 3 0x4000080 fsleep syz-executor 47518 468069 18125 0 2 0 syz-executor 47518 100355 18125 0 3 0x4000080 ttybg syz-executor 47518 442276 18125 0 2 0x4000000 syz-executor 66910 491660 29649 0 3 0x82 wait syz-executor 14090 34172 0 0 3 0x14200 acct acct 57442 12943 0 0 3 0x14280 nfsidl nfsio 90284 202947 0 0 3 0x14200 bored sosplice 18125 457865 29649 0 3 0x82 nanoslp syz-executor 33714 78341 29649 0 2 0xc82 syz-executor 35641 487563 29649 0 3 0x82 nanoslp syz-executor 39086 441905 29649 0 3 0x82 nanoslp syz-executor 37741 20136 29649 0 3 0x82 nanoslp syz-executor 29649 260304 21454 0 3 0x82 wait syz-executor 21454 497875 23939 0 3 0x10008a sigsusp ksh 23939 18677 83204 0 3 0x98 kqread sshd-session 83204 443193 58732 0 3 0x92 kqread sshd-session 82067 469417 1 0 3 0x100083 ttyopn getty 58732 254996 1 0 3 0x88 kqread sshd 42760 61370 1949 74 3 0x1100092 bpf pflogd 1949 131430 1 0 3 0x80 sbwait pflogd 92643 176952 98612 73 3 0x1100090 kqread syslogd 98612 326224 1 0 3 0x100082 sbwait syslogd 68032 124287 1 0 3 0x100080 kqread resolvd 61139 261364 52554 77 3 0x100092 kqread dhcpleased 37249 80139 52554 77 3 0x100092 kqread dhcpleased 52554 136411 1 0 3 0x80 kqread dhcpleased 96141 89267 0 0 3 0x14200 bored smr 12572 384702 0 0 2 0x14200 zerothread 6598 33841 0 0 3 0x14200 aiodoned aiodoned 60790 421515 0 0 3 0x14200 syncer update 88669 433390 0 0 3 0x14200 cleaner cleaner 28791 92474 0 0 3 0x14200 reaper reaper 90951 258423 0 0 3 0x14200 pgdaemon pagedaemon 27453 501978 0 0 3 0x14200 bored viomb 69298 93033 0 0 3 0x40014200 acpi0 acpi0 77083 504554 0 0 3 0x40014200 idle1 15163 109403 0 0 3 0x14200 bored softnet1 84686 399632 0 0 3 0x14200 bored softnet0 19629 240748 0 0 3 0x14200 bored systqmp 39263 120344 0 0 3 0x14200 bored systq 80965 288323 0 0 3 0x14200 tmoslp softclockmp 33607 206004 0 0 3 0x40014200 tmoslp softclock 88827 351599 0 0 3 0x40014200 idle0 1 28583 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 15593 (sh) thread 0xffff80003a80afb0 (138249) exclusive rwlock uobjlk r = 0 (0xfffffd800b045478) #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 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1214 #3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1348 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd8072259e88) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1902 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #7 recall_trap+0x8 Process 82797 (syz-executor) thread 0xffff80003a80a020 (475020) exclusive rrwlock inode r = 0 (0xfffffd806e1f35c0) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 sys_lchown+0x8b sys/kern/vfs_syscalls.c:2533 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838f9630) #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:746 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10226 11086K 11393K 166960K 11897 0 pcb 17 12K 12K 166960K 98 0 rtable 190 7K 7K 166960K 387 0 pf 32 17K 19K 166960K 96 0 ifaddr 36 6K 7K 166960K 84 0 ifgroup 51 2K 2K 166960K 114 0 sysctl 2 1K 9K 166960K 7 0 counters 66 36K 37K 166960K 124 0 ioctlops 0 0K 4K 166960K 1672 0 iov 0 0K 16K 166960K 25 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1430 90K 90K 166960K 1932 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 16 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 89K 166960K 610 0 sigio 0 0K 0K 166960K 13 0 proc 72 115K 164K 166960K 711 0 subproc 63 3K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 63 0 in_multi 72 5K 7K 166960K 160 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 3 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 580 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 220 152K 174K 166960K 7050 0 UVM aobj 14 2K 2K 166960K 14 0 pinsyscall 41 82K 100K 166960K 1854 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 11 0K 2K 166960K 58 0 temp 44 8644K 8722K 166960K 29639 0 kqueue 13 20K 29K 166960K 103 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 99 0 96 2 0 2 2 0 8 1 rtentry 176 144 0 64 5 0 5 5 0 8 0 unpcb 144 239 0 216 2 0 2 2 0 8 1 syncache 336 9 0 9 3 2 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 175 0 170 5 4 1 4 0 8 0 arp 136 15 0 6 1 0 1 1 0 8 0 inpcb 328 494 0 486 4 2 2 4 0 8 0 nd6 144 31 0 16 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 1 1 1 0 8 1 kcovpl 48 13 0 6 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 20 0 20 2 1 1 1 0 8 1 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 9 0 6 1 0 1 1 0 8 0 pfosfp 40 1429 0 1429 5 0 5 5 0 8 5 pfosfpen 112 1429 0 1429 21 0 21 21 0 8 21 pfstitem 24 46 0 12 1 0 1 1 0 8 0 pfstkey 128 46 0 12 2 0 2 2 0 8 0 pfstate 384 46 0 12 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 697 0 331 28 2 26 28 0 8 3 art_table 40 698 0 331 5 0 5 5 0 8 0 art_node 32 144 0 73 1 0 1 1 0 8 0 sysvmsgpl 40 45 0 8 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 12 0 3 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2385 0 870 96 0 96 96 0 8 1 ffsino 296 2389 0 874 117 0 117 117 0 8 0 nchpl 144 3131 0 1425 65 1 64 64 0 8 0 rtmask 32 3 0 3 1 0 1 1 0 8 1 uvmvnodes 80 2834 0 0 58 0 58 58 0 8 0 vnodes 216 2834 0 0 158 0 158 158 0 8 0 namei 1024 11643 0 11642 5 4 1 2 0 8 0 percpumem 16 77 0 29 1 0 1 1 0 8 0 kstatmem 264 68 0 44 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 17474 0 17474 11 4 7 8 1 8 7 plimitpl 152 194 0 175 1 0 1 1 0 8 0 sigapl 424 913 0 863 7 1 6 7 0 8 0 knotepl 120 615 0 0 19 0 19 19 0 8 0 kqueuepl 224 225 0 211 5 0 5 5 0 8 3 pipepl 344 177 0 150 3 0 3 3 0 8 0 fdescpl 528 889 0 859 3 0 3 3 0 8 0 filepl 160 5114 0 4902 21 5 16 16 0 8 6 lockfpl 104 259 0 256 1 0 1 1 0 8 0 lockfspl 48 76 0 73 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 57 0 40 1 0 1 1 0 8 0 ucredpl 104 882 0 869 1 0 1 1 0 8 0 zombiepl 144 935 0 933 1 0 1 1 0 8 0 processpl 1232 913 0 863 5 0 5 5 0 8 0 procpl 664 1659 0 1600 6 0 6 6 0 8 0 sosppl 168 8 0 8 1 0 1 1 0 8 1 sockpl 752 850 0 816 11 3 8 8 0 8 4 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 854 0 0 54 0 54 54 0 8 0 bufpl 280 7221 0 1078 439 0 439 439 0 8 0 anonpl 32 7585 0 0 62 0 62 62 0 246 0 amapchunkpl 152 22301 0 21865 37 6 31 31 0 158 11 amappl16 200 2897 0 2868 21 9 12 15 0 8 4 amappl15 192 35 0 35 1 1 0 1 0 8 0 amappl14 184 136 0 123 1 0 1 1 0 8 0 amappl13 176 9 0 8 1 0 1 1 0 8 0 amappl12 168 1616 0 1584 3 1 2 2 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 253 0 253 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 121 0 109 1 0 1 1 0 8 0 amappl6 120 250 0 246 1 0 1 1 0 8 0 amappl5 112 156 0 147 1 0 1 1 0 8 0 amappl4 104 341 0 321 1 0 1 1 0 8 0 amappl3 96 3834 0 3748 3 0 3 3 0 8 0 amappl2 88 1179 0 1103 2 0 2 2 0 8 0 amappl1 80 11812 0 11219 15 0 15 15 0 8 0 amappl 88 6213 0 6065 6 1 5 5 0 92 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 890 0 860 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 890 0 860 1 0 1 1 0 8 0 vmmpekpl 168 9231 0 9170 4 1 3 3 0 8 0 vmmpepl 168 64014 0 62136 106 8 98 100 0 357 6 vmsppl 488 889 0 860 7 2 5 5 0 8 0 rwobjpl 80 22839 0 19088 80 0 80 80 0 8 0 pdppl 4096 1788 0 1720 108 34 74 84 0 8 6 pvpl 32 17129 0 0 140 1 139 139 0 265 0 pmappl 256 889 0 860 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 333 0 49 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace ufs_lookup() at ufs_lookup+0x623 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd807a732c30,ffff80002a361fc8,ffff80002a361ff8) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a361f98) at vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 namei(ffff80002a361f98) at namei+0x7ca sys/kern/vfs_lookup.c:250 sys_lchown(ffff80003a80a020,ffff80002a362220,ffff80002a362170) at sys_lchown+0x8b sys/kern/vfs_syscalls.c:2533 syscall(ffff80002a362220) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a362220) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4651d36200, count: -7 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c423c50) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c423c50) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a8ca0435120, count: 9 ddb{1}> trace x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c423c50) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c423c50) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a8ca0435120, count: -6