kernel: protection fault trap, code=0 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> 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(ffff8000ffffd230) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a1f4080 rbx 0 rdx 0 rcx 0xffff8000ffffd230 rax 0xffff80002999dffe r8 0x7f7fffffc000 r9 0x1 r10 0x1ba33aef606d64e1 r11 0x319bb4006c6bdf0 r12 0xdeadbeefdeadc0fe r13 0x9 r14 0xdeadbeefdeadc007 r15 0 rip 0xffffffff82d9e3c5 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a1f3fe0 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> show proc PROC (reaper) tid=99131 pid=42474 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffff758,0xffff8000ffffcfa8 process=0xffff8000ffffb9c0 user=0xffff80002a1ef000, vmspace=0xffffffff83adca50 estcpu=0, cpticks=20, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36832 186696 89650 32767 2 0x10 syz-executor 36832 18743 89650 32767 2 0x4000010 syz-executor 70940 145347 59193 32767 2 0x10 syz-executor 70940 181662 59193 32767 3 0x4000090 kqpoll syz-executor 17414 304354 6347 32767 2 0x10 syz-executor 17414 113700 6347 32767 3 0x4000090 fsleep syz-executor 81426 408311 92056 32767 2 0x10 syz-executor 81426 48995 92056 32767 7 0x4000010 syz-executor 81426 299864 92056 32767 3 0x4000090 fsleep syz-executor 9151 238307 79821 0 3 0x100082 sbwait arp 79821 231362 89018 0 3 0x10008a sigsusp sh 8779 350831 95004 0 3 0x100082 sbwait arp 95004 414139 86868 0 3 0x10008a sigsusp sh 59193 420132 94213 32767 3 0x90 nanoslp syz-executor 18102 321618 39338 32767 3 0x10 biowait syz-executor 6347 174337 91961 32767 3 0x90 nanoslp syz-executor 86868 256608 38965 0 3 0x80 wait syz-executor 89018 479782 15588 0 3 0x80 wait syz-executor 92056 457249 39134 32767 2 0x10 syz-executor 89650 397117 70502 32767 3 0x90 nanoslp syz-executor 39338 32450 77583 0 3 0x82 wait syz-executor 94213 136270 77583 0 3 0x82 wait syz-executor 91961 97169 77583 0 3 0x82 wait syz-executor 15588 401968 77583 0 3 0x82 wait syz-executor 38965 360077 77583 0 3 0x82 wait syz-executor 39134 367132 77583 0 3 0x82 wait syz-executor 70502 414699 77583 0 3 0x82 wait syz-executor 77583 265032 52807 0 3 0x82 nanoslp syz-executor 52807 288578 46258 0 3 0x10008a sigsusp ksh 46258 509428 13015 0 3 0x98 kqread sshd-session 13015 32385 85062 0 3 0x92 kqread sshd-session 25818 278776 1 0 3 0x100083 ttyin getty 85062 152298 1 0 3 0x88 kqread sshd 27735 462481 75637 73 3 0x1100090 kqread syslogd 75637 254178 1 0 3 0x100082 sbwait syslogd 90593 167977 1 0 3 0x100080 kqread resolvd 86818 335853 89692 77 3 0x100092 kqread dhcpleased 88751 6057 89692 77 3 0x100092 kqread dhcpleased 89692 61182 1 0 3 0x80 kqread dhcpleased 59365 478614 0 0 3 0x14200 bored smr 18467 402018 0 0 2 0x14200 zerothread 63479 252520 0 0 3 0x14200 aiodoned aiodoned 75407 135431 0 0 3 0x14200 syncer update 71914 492760 0 0 3 0x14200 cleaner cleaner *42474 99131 0 0 7 0x14200 reaper 92393 101599 0 0 3 0x14200 pgdaemon pagedaemon 25903 352805 0 0 3 0x14200 bored viomb 60330 471836 0 0 3 0x40014200 acpi0 acpi0 89901 100169 0 0 3 0x40014200 idle1 95599 512401 0 0 3 0x14200 bored softnet1 67667 207681 0 0 3 0x14200 bored softnet0 3895 467870 0 0 3 0x14200 bored systqmp 34638 448385 0 0 3 0x14200 bored systq 36102 34163 0 0 3 0x14200 tmoslp softclockmp 32788 459136 0 0 3 0x40014200 tmoslp softclock 23793 422076 0 0 3 0x40014200 idle0 1 356407 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 18102 (syz-executor) thread 0xffff8000377b27e8 (321618) exclusive rrwlock inode r = 0 (0xfffff68071c34a08) #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 (0xfffff6806cca1430) #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+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #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 Process 42474 (reaper) thread 0xffff8000ffffd230 (99131) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a79cc0) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11048 12016K 12034K 166960K 12142 0 pcb 17 12K 12K 166960K 17 0 rtable 187 5K 6K 166960K 314 0 pf 29 16K 16K 166960K 31 0 ifaddr 34 5K 6K 166960K 40 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 4K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1512 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 73 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 129K 166960K 334 0 sigio 0 0K 0K 166960K 3 0 proc 58 99K 147K 166960K 512 0 subproc 63 3K 4K 166960K 216 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 24 0 in_multi 68 5K 6K 166960K 80 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 377 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 228 155K 187K 166960K 4363 0 UVM aobj 8 2K 2K 166960K 8 0 pinsyscall 47 94K 118K 166960K 1409 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 10 0K 1K 166960K 23 0 temp 70 9127K 9132K 166960K 4307 0 kqueue 15 22K 28K 166960K 48 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 36 0 31 1 0 1 1 0 8 0 rtentry 176 97 0 12 5 0 5 5 0 8 0 unpcb 144 105 0 89 1 0 1 1 0 8 0 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpcb 736 91 0 85 4 1 3 4 0 8 2 arp 136 17 0 2 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 226 0 216 7 1 6 7 0 8 5 nd6 152 19 0 3 1 0 1 1 0 8 0 kcovpl 48 24 0 17 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 374 0 44 24 1 23 24 0 8 0 art_table 40 375 0 44 4 0 4 4 0 8 0 art_node 32 97 0 19 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 71 0 61 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1776 0 297 93 0 93 93 0 8 0 ffsino 296 1776 0 297 114 0 114 114 0 8 0 nchpl 144 2173 0 470 64 0 64 64 0 8 0 vnodes 216 2001 0 0 112 0 112 112 0 8 0 namei 1024 6908 0 6908 1 0 1 1 0 8 1 percpumem 16 50 0 1 1 0 1 1 0 8 0 kstatmem 264 25 0 2 2 0 2 2 0 8 0 scxspl 216 7563 0 7562 11 3 8 8 1 8 7 plimitpl 152 126 0 104 2 0 2 2 0 8 1 sigapl 424 596 0 544 7 0 7 7 0 8 0 knotepl 120 334 0 0 10 0 10 10 0 8 0 kqueuepl 224 59 0 47 1 0 1 1 0 8 0 pipepl 344 179 0 152 3 0 3 3 0 8 0 fdescpl 528 580 0 544 4 0 4 4 0 8 0 filepl 160 2632 0 2434 12 1 11 12 0 8 2 lockfpl 104 79 0 77 1 0 1 1 0 8 0 lockfspl 48 28 0 26 1 0 1 1 0 8 0 sessionpl 144 47 0 32 1 0 1 1 0 8 0 pgrppl 48 73 0 51 1 0 1 1 0 8 0 ucredpl 104 380 0 364 1 0 1 1 0 8 0 zombiepl 144 544 0 544 1 0 1 1 0 8 1 processpl 1232 596 0 544 5 0 5 5 0 8 0 procpl 664 837 0 780 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 369 0 338 10 1 9 10 0 8 5 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 127 0 0 16 0 16 16 0 8 0 mcl2k 2048 33 0 0 5 0 5 5 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 305 0 0 20 0 20 20 0 8 0 bufpl 272 2522 0 102 162 0 162 162 0 8 0 anonpl 32 7486 0 0 61 0 61 61 0 246 0 amapchunkpl 152 12982 0 12526 36 0 36 36 0 158 17 amappl16 200 2043 0 2027 14 8 6 14 0 8 2 amappl15 192 3 0 2 1 0 1 1 0 8 0 amappl14 184 395 0 392 1 0 1 1 0 8 0 amappl13 176 139 0 127 1 0 1 1 0 8 0 amappl12 168 804 0 770 2 0 2 2 0 8 0 amappl11 160 9 0 9 1 1 0 1 0 8 0 amappl10 152 61 0 51 1 0 1 1 0 8 0 amappl9 144 270 0 270 1 1 0 1 0 8 0 amappl8 136 93 0 92 1 0 1 1 0 8 0 amappl7 128 140 0 127 1 0 1 1 0 8 0 amappl6 120 150 0 147 1 0 1 1 0 8 0 amappl5 112 99 0 92 1 0 1 1 0 8 0 amappl4 104 264 0 247 1 0 1 1 0 8 0 amappl3 96 2397 0 2284 5 1 4 4 0 8 0 amappl2 88 531 0 475 2 0 2 2 0 8 0 amappl1 80 11640 0 11026 19 2 17 17 0 8 2 amappl 88 3648 0 3492 5 0 5 5 0 92 0 uvmvnodes 80 106 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 0 1 0 1 1 0 8 0 uaddrrnd 24 580 0 544 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 580 0 544 1 0 1 1 0 8 0 vmmpekpl 168 7176 0 7136 3 0 3 3 0 8 0 vmmpepl 168 47006 0 45038 106 3 103 103 0 357 8 vmsppl 488 579 0 544 7 1 6 6 0 8 0 rwobjpl 80 16749 0 15745 27 1 26 26 0 8 1 pdppl 4096 1167 0 1088 123 38 85 99 0 8 6 pvpl 32 15093 0 0 122 0 122 122 0 265 0 pmappl 256 579 0 544 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 463 0 44 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8397aff0) 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(ffffffff83a794c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a794c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a2ddab0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d knote_drop(fffff68078c494b8,ffff80003a7d2028) at knote_drop+0x11a sys/kern/kern_event.c:2313 kqueue_register(fffff680793db7e0,ffff80002a2ddd00,0,ffff80003a7d2028) at kqueue_register+0xcbb sys/kern/kern_event.c:-1 sys_kevent(ffff80003a7d2028,ffff80002a2de060,ffff80002a2ddfb0) at sys_kevent+0x3bc sys/kern/kern_event.c:1303 syscall(ffff80002a2de060) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2de060) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b466770000, count: -12 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> 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(ffff8000ffffd230) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4