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(ffff8000ffffd230) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a234920 rbx 0 rdx 0 rcx 0xffff8000ffffd230 rax 0xffffffff838b2ffe cpu_info_full_primary+0x1ffe r8 0x2 r9 0 r10 0xdc6b16abdbdf9d79 r11 0xe08b0eb7865e10db r12 0xdeadbeefdeadc0fe r13 0x9 r14 0xdeadbeefdeadc007 r15 0 rip 0xffffffff819f9825 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a234880 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{0}> show proc PROC (reaper) tid=105564 pid=10529 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=0xffff8000fffffc88,0xffff8000ffffcfa8 process=0xffff8000ffffb9c0 user=0xffff80002a22f000, vmspace=0xffffffff838d91a8 estcpu=0, cpticks=6, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 1295 331056 9290 32767 2 0x10 syz-executor 28873 229597 2513 32767 2 0x10 syz-executor 28873 100221 2513 32767 3 0x4000090 fsleep syz-executor 50663 241104 7866 32767 2 0x10 syz-executor 50663 79323 7866 32767 3 0x4000090 fsleep syz-executor 50663 422787 7866 32767 2 0x4000010 syz-executor 50663 186329 7866 32767 2 0x4000010 syz-executor 47293 171814 59794 32767 3 0x90 nanoslp syz-executor 47293 96530 59794 32767 3 0x4000090 kqread syz-executor 47293 133846 59794 32767 3 0x4000090 fsleep syz-executor 50911 100707 19768 32767 3 0x90 nanoslp syz-executor 50911 505088 19768 32767 3 0x4000090 ttyin syz-executor 50911 267265 19768 32767 3 0x4000090 fsleep syz-executor 92091 523023 24186 32767 3 0x90 nanoslp syz-executor 92091 470638 24186 32767 3 0x4000090 sbwait syz-executor 92091 147893 24186 32767 3 0x4000090 fsleep syz-executor 59794 331824 54695 32767 3 0x90 nanoslp syz-executor 25368 229655 20409 32767 7 0x10 syz-executor 19768 439876 254 32767 3 0x90 nanoslp syz-executor 2513 375549 87054 32767 2 0x10 syz-executor 7866 322741 50591 32767 3 0x90 nanoslp syz-executor 24186 449161 32800 32767 3 0x90 nanoslp syz-executor 9290 267371 89720 32767 3 0x90 nanoslp syz-executor 20409 78971 36148 0 3 0x82 wait syz-executor 50591 120065 36148 0 3 0x82 wait syz-executor 254 453173 36148 0 3 0x82 wait syz-executor 75661 117096 36148 0 3 0x82 wait syz-executor 54695 400429 36148 0 3 0x82 wait syz-executor 87054 404642 36148 0 3 0x82 wait syz-executor 32800 211772 36148 0 3 0x82 wait syz-executor 89720 60168 36148 0 3 0x82 wait syz-executor 36148 240693 71187 0 3 0x82 kqread syz-executor 71187 279769 84742 0 3 0x10008a sigsusp ksh 84742 395546 31954 0 3 0x98 kqread sshd-session 31954 467848 89810 0 3 0x92 kqread sshd-session 43083 450875 1 0 3 0x100083 ttyin getty 89810 280310 1 0 3 0x88 kqread sshd 89792 124189 21488 73 3 0x1100090 kqread syslogd 21488 352966 1 0 3 0x100082 sbwait syslogd 46921 373974 1 0 3 0x100080 kqread resolvd 49839 36855 22143 77 3 0x100092 kqread dhcpleased 16587 399804 22143 77 3 0x100092 kqread dhcpleased 22143 316300 1 0 3 0x80 kqread dhcpleased 75994 309277 0 0 3 0x14200 bored smr 73576 8801 0 0 2 0x14200 zerothread 96789 153863 0 0 3 0x14200 aiodoned aiodoned 47686 169272 0 0 3 0x14200 syncer update 85994 161517 0 0 3 0x14200 cleaner cleaner *10529 105564 0 0 7 0x14200 reaper 51362 376360 0 0 3 0x14200 pgdaemon pagedaemon 59798 176921 0 0 3 0x14200 bored viomb 86006 420255 0 0 3 0x40014200 acpi0 acpi0 34400 341211 0 0 3 0x40014200 idle1 15143 330225 0 0 3 0x14200 bored softnet1 57802 487238 0 0 3 0x14200 bored softnet0 79587 153843 0 0 3 0x14200 tqbarend systqmp 909 317319 0 0 3 0x14200 bored systq 15706 455135 0 0 3 0x14200 tmoslp softclockmp 79848 34059 0 0 3 0x40014200 tmoslp softclock 42764 174878 0 0 3 0x40014200 idle0 1 508931 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 25368 (syz-executor) thread 0xffff8000fffe7778 (229655) exclusive rrwlock inode r = 0 (0xfffffd806cb79200) #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:570 #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+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d232a10) #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:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 10529 (reaper) thread 0xffff8000ffffd230 (105564) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8393b308) #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:2217 #5 reaper+0x26d sys/kern/kern_exit.c:513 #6 proc_trampoline+0x10 Process 79587 (systqmp) thread 0xffff8000ffffe298 (153843) shared rwlock systqmp r = 0 (0xffffffff83842068) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11055 12019K 12034K 166960K 12146 0 pcb 17 12K 12K 166960K 17 0 rtable 241 6K 7K 166960K 362 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 2 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 34 0 iov 0 0K 12K 166960K 21 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1603 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 125K 166960K 396 0 sigio 0 0K 0K 166960K 3 0 proc 58 99K 163K 166960K 514 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 172 0 in_multi 99 7K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 379 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 248 168K 192K 166960K 5224 0 UVM aobj 42 3K 3K 166960K 42 0 pinsyscall 45 90K 116K 166960K 1449 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 25 0 NDP 11 0K 2K 166960K 27 0 temp 75 8680K 8746K 166960K 8213 0 kqueue 17 26K 30K 166960K 90 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 120 122 0 118 3 0 3 3 0 8 2 rtentry 176 114 0 2 6 0 6 6 0 8 0 unpcb 144 349 0 264 4 0 4 4 0 8 0 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 106 0 101 1 0 1 1 0 8 0 arp 136 18 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 0 1 0 1 1 0 8 0 inpcb 328 392 0 383 7 0 7 7 0 8 6 ip6q 72 2 0 0 1 0 1 1 0 8 0 ip6af 40 2 0 0 1 0 1 1 0 8 0 nd6 152 27 0 1 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 458 0 2 29 0 29 29 0 8 0 art_table 40 459 0 2 5 0 5 5 0 8 0 art_node 32 114 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 39 0 0 2 0 2 2 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2155 0 643 95 0 95 95 0 8 0 ffsino 296 2155 0 643 117 0 117 117 0 8 0 nchpl 144 2705 0 1018 63 0 63 63 0 8 0 vnodes 216 2236 0 0 125 0 125 125 0 8 0 namei 1024 8190 0 8190 1 0 1 1 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 8241 0 8241 8 1 7 7 1 8 7 plimitpl 152 109 0 84 2 0 2 2 0 8 0 sigapl 424 679 0 627 7 0 7 7 0 8 0 knotepl 120 306 0 0 10 0 10 10 0 8 0 kqueuepl 224 192 0 180 5 0 5 5 0 8 4 pipepl 344 130 0 100 3 0 3 3 0 8 0 fdescpl 528 663 0 627 4 0 4 4 0 8 0 filepl 160 3800 0 3397 17 0 17 17 0 8 0 lockfpl 104 86 0 84 1 0 1 1 0 8 0 lockfspl 48 36 0 34 1 0 1 1 0 8 0 sessionpl 144 24 0 8 1 0 1 1 0 8 0 pgrppl 48 36 0 12 1 0 1 1 0 8 0 ucredpl 104 1098 0 1079 1 0 1 1 0 8 0 zombiepl 144 628 0 627 1 0 1 1 0 8 0 processpl 1232 679 0 627 5 0 5 5 0 8 0 procpl 664 1128 0 1066 7 0 7 7 0 8 1 sosppl 176 3 0 3 1 0 1 1 0 8 1 sockpl 752 866 0 768 11 0 11 11 0 8 1 mcl64k 65536 3 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 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1188 0 0 75 0 75 75 0 8 0 bufpl 280 2688 0 119 184 0 184 184 0 8 0 anonpl 32 11662 0 0 95 0 95 95 0 246 0 amapchunkpl 152 16769 0 16174 40 0 40 40 0 158 10 amappl16 200 2306 0 2243 28 12 16 24 0 8 8 amappl15 192 46 0 46 1 1 0 1 0 8 0 amappl14 184 6 0 5 1 0 1 1 0 8 0 amappl13 176 433 0 432 1 0 1 1 0 8 0 amappl12 168 993 0 949 3 0 3 3 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 43 0 33 1 0 1 1 0 8 0 amappl9 144 257 0 257 1 1 0 1 0 8 0 amappl8 136 18 0 16 1 0 1 1 0 8 0 amappl7 128 74 0 73 1 0 1 1 0 8 0 amappl6 120 270 0 259 1 0 1 1 0 8 0 amappl5 112 70 0 63 1 0 1 1 0 8 0 amappl4 104 398 0 375 1 0 1 1 0 8 0 amappl3 96 2661 0 2568 4 0 4 4 0 8 1 amappl2 88 813 0 736 2 0 2 2 0 8 0 amappl1 80 10442 0 9897 14 0 14 14 0 8 1 amappl 88 4484 0 4305 6 0 6 6 0 92 1 uvmvnodes 80 109 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 41 0 0 1 0 1 1 0 8 0 uaddrrnd 24 663 0 627 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 663 0 627 1 0 1 1 0 8 0 vmmpekpl 168 7099 0 7062 2 0 2 2 0 8 0 vmmpepl 168 49917 0 47888 109 0 109 109 0 357 13 vmsppl 488 662 0 627 7 1 6 6 0 8 1 rwobjpl 80 16563 0 15550 29 0 29 29 0 8 4 pdppl 4096 1333 0 1254 111 26 85 97 0 8 6 pvpl 32 19989 0 0 162 0 162 162 0 265 0 pmappl 256 662 0 627 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 347 0 29 10 0 10 10 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(ffff8000ffffd230) 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(ffff8000299ddff0) 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(ffffffff8393b100) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff8393b100) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff8393b100,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd806da3a010) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806da3a010) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ufs_dirremove(fffffd806da56e90,fffffd806cb79160,800c,1) at ufs_dirremove+0x290 sys/ufs/ufs/ufs_lookup.c:919 ufs_rmdir(ffff80003a7f22f0) at ufs_rmdir+0x238 sys/ufs/ufs/ufs_vnops.c:1248 VOP_RMDIR(fffffd806da56e90,fffffd8067553878,ffff80003a7f23c8) at VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413 dounlinkat(ffff8000fffe7778,ffffff9c,78c03a885d10,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1901 syscall(ffff80003a7f2540) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7f2540) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78c03a885d00, count: -14