kernel: protection fault trap, code=0 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace witness_checkorder(deadbeefdeadc007,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(deadbeefdeadbff7) at mtx_enter+0x95 sys/kern/kern_lock.c:406 prsignal(deadbeefdeadbeef,14) at prsignal+0x36 sys/kern/kern_sig.c:904 reaper(ffff8000ffffdc90) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a1f4220 rbx 0 rdx 0 rcx 0xffff8000ffffdc90 rax 0xffffffff8392affe cpu_info_full_primary+0x1ffe r8 0xffffffffffffffff r9 0 r10 0x65f4e50b80dddc22 r11 0x3d0e8bf6d1b37f5f r12 0xdeadbeefdeadc0fe r13 0x9 r14 0xdeadbeefdeadc007 r15 0 rip 0xffffffff81807395 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a1f4180 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{0}> show proc PROC (reaper) tid=374697 pid=37197 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffffc88,0xffff8000ffffd4d8 process=0xffff8000ffffb4f0 user=0xffff80002a1ef000, vmspace=0xffffffff83a54290 estcpu=1, cpticks=5, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99008 341366 0 0 3 0x14280 nfsidl nfsio 31717 232319 31450 0 2 0 syz-executor 31717 365472 31450 0 3 0x4000080 sysctllk syz-executor 35318 489693 0 0 3 0x14280 nfsidl nfsio 3109 160965 0 0 3 0x14280 nfsidl nfsio 48837 59854 0 0 3 0x14280 nfsidl nfsio 77913 280957 0 0 3 0x14280 nfsidl nfsio 14126 371740 0 0 3 0x14280 nfsidl nfsio 42199 474369 0 0 3 0x14280 nfsidl nfsio 15336 342521 0 0 3 0x14280 nfsidl nfsio 46325 398616 0 0 3 0x14280 nfsidl nfsio 60828 170947 71361 0 3 0x80 nanoslp syz-executor 60828 195263 71361 0 3 0x4000080 kqread syz-executor 60828 467776 71361 0 3 0x4000080 kqread syz-executor 60828 243296 71361 0 3 0x4000080 fsleep syz-executor 89386 386037 6012 0 2 0x11 syz-executor 89386 460335 6012 0 2 0x4000010 syz-executor 89386 512608 6012 0 2 0x4000011 syz-executor 74021 73114 44855 0 2 0x1 syz-executor 74021 341481 44855 0 3 0x4000080 netcon syz-executor 74021 267877 44855 0 3 0x4000080 fsleep syz-executor 31982 105163 77390 0 2 0 syz-executor 31982 111097 77390 0 3 0x4000080 fsleep syz-executor 31982 268211 77390 0 3 0x4000080 fsleep syz-executor 31982 258611 77390 0 3 0x4000080 fsleep syz-executor 2077 267791 74486 0 2 0 syz-executor 2077 73733 74486 0 2 0x4000001 syz-executor 44855 326875 50821 0 3 0x82 nanoslp syz-executor 77390 178341 50821 0 3 0x82 nanoslp syz-executor 23732 494086 50821 0 2 0x2 syz-executor 3092 371794 50821 0 3 0x82 nanoslp syz-executor 31450 323547 50821 0 3 0x82 nanoslp syz-executor 6012 126819 50821 0 3 0x82 nanoslp syz-executor 71361 207047 50821 0 3 0x82 nanoslp syz-executor 74486 325150 50821 0 3 0x82 nanoslp syz-executor 50821 134730 36988 0 3 0x82 kqread syz-executor 36988 306418 92400 0 3 0x10008a sigsusp ksh 92400 497861 51130 0 3 0x98 kqread sshd-session 51130 337642 33837 0 3 0x92 kqread sshd-session 73826 342418 1 0 3 0x100083 ttyin getty 33837 365250 1 0 3 0x88 kqread sshd 49830 195529 98405 74 3 0x1100092 bpf pflogd 98405 399042 1 0 3 0x80 sbwait pflogd 54072 374092 75325 73 3 0x1100090 kqread syslogd 75325 279437 1 0 3 0x100082 sbwait syslogd 60025 392135 1 0 3 0x100080 kqread resolvd 28104 438756 57681 77 3 0x100092 kqread dhcpleased 88217 76300 57681 77 3 0x100092 kqread dhcpleased 57681 243406 1 0 3 0x80 kqread dhcpleased 31526 277969 0 0 3 0x14200 bored smr 81192 54065 0 0 2 0x14200 zerothread 30413 138637 0 0 3 0x14200 aiodoned aiodoned 27527 136347 0 0 3 0x14200 syncer update 25391 85653 0 0 3 0x14200 cleaner cleaner *37197 374697 0 0 7 0x14200 reaper 4408 127065 0 0 3 0x14200 pgdaemon pagedaemon 65807 379064 0 0 3 0x14200 bored viomb 33154 335843 0 0 3 0x40014200 acpi0 acpi0 63928 235289 0 0 3 0x40014200 idle1 38860 96081 0 0 3 0x14200 bored softnet1 46399 482577 0 0 2 0x14200 softnet0 40341 20915 0 0 3 0x14200 bored systqmp 37519 253650 0 0 3 0x14200 bored systq 44417 517779 0 0 3 0x14200 tmoslp softclockmp 42260 504484 0 0 3 0x40014200 tmoslp softclock 94434 61319 0 0 3 0x40014200 idle0 1 93367 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 89386 (syz-executor) thread 0xffff80003739aa88 (460335) exclusive rwlock sysctllk r = 0 (0xffffffff839bbe18) #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 sysctl_vslock+0x45 sys/kern/kern_sysctl.c:192 #3 sys_sysctl+0x371 sys/kern/kern_sysctl.c:304 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 Process 23732 (syz-executor) thread 0xffff80002a2214d8 (494086) exclusive rrwlock inode r = 0 (0xfffffa006c50ec58) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffa006c50ea08) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #10 namei+0x7c5 sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 37197 (reaper) thread 0xffff8000ffffdc90 (374697) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a57a40) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298 #4 knote_processexit+0x2b sys/kern/kern_event.c:2235 #5 reaper+0x26d sys/kern/kern_exit.c:513 #6 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11055 12086K 12159K 166960K 12157 0 pcb 19 12K 12K 166960K 31 0 rtable 243 7K 7K 166960K 374 0 pf 34 17K 24K 166960K 58 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 70 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1489 0 iov 0 0K 6K 166960K 70 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1296 82K 82K 166960K 1373 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 97K 166960K 158 0 proc 73 131K 180K 166960K 558 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 2 0 in_multi 99 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 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 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 393 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 235 167K 188K 166960K 3309 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 41 82K 106K 166960K 1354 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 3 0 NDP 15 0K 2K 166960K 28 0 temp 39 9118K 9134K 166960K 5170 0 kqueue 16 23K 25K 166960K 31 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 39 0 36 1 0 1 1 0 8 0 rtentry 176 112 0 2 5 0 5 5 0 8 0 unpcb 144 62 0 45 1 0 1 1 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 18 0 12 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 96 0 84 2 0 2 2 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 21 0 0 1 0 1 1 0 8 0 pfstkey 128 21 0 0 1 0 1 1 0 8 0 pfstate 448 21 0 0 3 0 3 3 0 8 0 pfrule 1360 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 5 0 3 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1598 0 126 93 0 93 93 0 8 0 ffsino 296 1598 0 126 114 0 114 114 0 8 0 nchpl 144 1829 0 123 64 0 64 64 0 8 0 vnodes 216 1697 0 0 95 0 95 95 0 8 0 namei 1024 5711 0 5711 3 2 1 2 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scxspl 216 6333 0 6333 4 3 1 3 1 8 1 plimitpl 152 31 0 14 1 0 1 1 0 8 0 sigapl 424 495 0 439 8 1 7 7 0 8 0 knotepl 120 62 0 0 2 0 2 2 0 8 0 kqueuepl 224 30 0 18 1 0 1 1 0 8 0 pipepl 344 132 0 105 3 0 3 3 0 8 0 fdescpl 528 470 0 440 3 0 3 3 0 8 0 filepl 160 1798 0 1576 10 0 10 10 0 8 0 lockfpl 104 25 0 22 1 0 1 1 0 8 0 lockfspl 48 13 0 10 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 98 0 84 1 0 1 1 0 8 0 zombiepl 144 448 0 447 2 1 1 1 0 8 0 processpl 1232 495 0 439 5 0 5 5 0 8 0 procpl 664 541 0 473 6 0 6 6 0 8 0 sockpl 752 199 0 167 5 1 4 5 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 167 0 0 11 0 11 11 0 8 0 bufpl 272 2337 0 105 149 0 149 149 0 8 0 anonpl 32 7883 0 0 64 0 64 64 0 246 0 amapchunkpl 152 8854 0 8368 22 0 22 22 0 158 1 amappl16 200 1434 0 1412 14 0 14 14 0 8 12 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 437 0 436 1 0 1 1 0 8 0 amappl13 176 128 0 116 1 0 1 1 0 8 0 amappl12 168 727 0 698 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 65 0 50 1 0 1 1 0 8 0 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 110 0 108 1 0 1 1 0 8 0 amappl7 128 160 0 147 1 0 1 1 0 8 0 amappl6 120 163 0 161 1 0 1 1 0 8 0 amappl5 112 100 0 90 1 0 1 1 0 8 0 amappl4 104 300 0 279 1 0 1 1 0 8 0 amappl3 96 1612 0 1499 4 0 4 4 0 8 0 amappl2 88 660 0 599 2 0 2 2 0 8 0 amappl1 80 11136 0 10530 17 0 17 17 0 8 2 amappl 88 2547 0 2384 4 0 4 4 0 92 0 uvmvnodes 80 102 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 470 0 440 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 470 0 440 1 0 1 1 0 8 0 vmmpekpl 168 6144 0 6110 2 0 2 2 0 8 0 vmmpepl 168 40230 0 38354 109 8 101 109 0 357 7 vmsppl 488 469 0 439 5 0 5 5 0 8 1 rwobjpl 80 14960 0 13920 32 1 31 32 0 8 4 pdppl 4096 947 0 878 103 30 73 87 0 8 4 pvpl 32 15008 0 0 122 0 122 122 0 265 0 pmappl 256 469 0 439 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 425 0 35 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace witness_checkorder(deadbeefdeadc007,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(deadbeefdeadbff7) at mtx_enter+0x95 sys/kern/kern_lock.c:406 prsignal(deadbeefdeadbeef,14) at prsignal+0x36 sys/kern/kern_sig.c:904 reaper(ffff8000ffffdc90) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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(ffffffff83a57240) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a57240) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvn_detach(fffffa006c1fdd80) at uvn_detach+0x7e sys/uvm/uvm_vnode.c:-1 uvm_unmap_detach(ffff80003c3feb70,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvm_map_teardown(fffffa000f0c57c0) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536 exit1(ffff8000fffe82b8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe82b8,ffff80003c3fed40,ffff80003c3fec90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3fed40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3fed40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7159b62b5040, count: -11