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(dead4110dead4228,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(dead4110dead4218) at mtx_enter+0x95 sys/kern/kern_lock.c:406 prsignal(dead4110dead4110,14) at prsignal+0x36 sys/kern/kern_sig.c:904 reaper(ffff8000ffffd760) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a234700 rbx 0 rdx 0 rcx 0xffff8000ffffd760 rax 0xffff8000299ddffe r8 0x2 r9 0x1 r10 0x25fe77758c8afbbb r11 0xa9954314b929312a r12 0xdead4110dead42fe r13 0x9 r14 0xdead4110dead4228 r15 0 rip 0xffffffff82a7e285 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a234660 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> show proc PROC (reaper) tid=38363 pid=15335 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=0xffff8000fffff9f0,0xffff8000ffffcfa8 process=0xffff8000ffffb9c0 user=0xffff80002a22f000, vmspace=0xffffffff839893d0 estcpu=1, cpticks=11, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 62900 382396 0 0 3 0x14200 acct acct 23230 266856 50578 0 2 0 syz-executor 23230 389196 50578 0 7 0x4000000 syz-executor 23230 260986 50578 0 3 0x4000080 fsleep syz-executor 69920 427577 73261 0 3 0x80 nanoslp syz-executor 69920 395616 73261 0 3 0x4000080 lockf syz-executor 69920 519129 73261 0 3 0x4000080 lockf syz-executor 69920 243401 73261 0 3 0x4000080 fsleep syz-executor 65633 20397 41068 0 3 0x80 nanoslp syz-executor 65633 344960 41068 0 3 0x4000080 fsleep syz-executor 65633 489788 41068 0 3 0x4000080 sbwait syz-executor 65633 99571 41068 0 3 0x4000080 fsleep syz-executor 2053 257482 98348 0 3 0x100082 sbwait arp 98348 35525 6266 0 3 0x10008a sigsusp sh 76804 341390 57815 0 3 0x82 nanoslp syz-executor 76758 43064 57815 0 3 0x2 biowait syz-executor 50578 72603 57815 0 3 0x82 nanoslp syz-executor 73261 153256 57815 0 3 0x82 nanoslp syz-executor 57908 285089 57815 0 3 0x82 nanoslp syz-executor 6266 341821 57815 0 3 0x82 wait syz-executor 41068 425238 57815 0 3 0x82 nanoslp syz-executor 33941 137256 57815 0 3 0x82 nanoslp syz-executor 57815 59550 10515 0 3 0x82 kqread syz-executor 10515 167933 6271 0 3 0x10008a sigsusp ksh 6271 421379 28874 0 3 0x98 kqread sshd-session 28874 131092 33672 0 3 0x92 kqread sshd-session 67519 296319 1 0 3 0x100083 ttyopn getty 33672 295069 1 0 3 0x88 kqread sshd 30587 389239 77104 74 3 0x1100092 bpf pflogd 77104 50269 1 0 3 0x80 sbwait pflogd 79859 32015 54390 73 3 0x1100090 kqread syslogd 54390 213379 1 0 3 0x100082 sbwait syslogd 33983 102118 1 0 3 0x100080 kqread resolvd 48553 212798 93492 77 3 0x100092 kqread dhcpleased 33448 11944 93492 77 3 0x100092 kqread dhcpleased 93492 484163 1 0 3 0x80 kqread dhcpleased 26551 420003 0 0 3 0x14200 bored smr 13036 144887 0 0 3 0x14200 pgzero zerothread 14883 103984 0 0 3 0x14200 aiodoned aiodoned 92463 178776 0 0 3 0x14200 syncer update 658 17040 0 0 3 0x14200 cleaner cleaner *15335 38363 0 0 7 0x14200 reaper 73180 433398 0 0 3 0x14200 pgdaemon pagedaemon 52537 94229 0 0 3 0x14200 bored viomb 43030 265446 0 0 3 0x40014200 acpi0 acpi0 31966 59382 0 0 3 0x40014200 idle1 1703 364295 0 0 3 0x14200 bored softnet1 997 87193 0 0 3 0x14200 bored softnet0 58080 133767 0 0 3 0x14200 bored systqmp 3767 328144 0 0 3 0x14200 bored systq 89951 21544 0 0 3 0x14200 tmoslp softclockmp 43480 74335 0 0 3 0x40014200 tmoslp softclock 67815 159863 0 0 3 0x40014200 idle0 1 476425 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 76758 (syz-executor) thread 0xffff8000fffee7e0 (43064) exclusive rrwlock inode r = 0 (0xfffffd806c878a20) #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 (0xfffffd806ce20328) #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 15335 (reaper) thread 0xffff8000ffffd760 (38363) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838c4c48) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10225 11033K 11363K 166960K 11605 0 pcb 17 12K 12K 166960K 111 0 rtable 204 8K 9K 166960K 407 0 pf 33 17K 19K 166960K 76 0 ifaddr 37 6K 7K 166960K 65 0 ifgroup 51 2K 2K 166960K 92 0 sysctl 3 1K 9K 166960K 12 0 counters 68 36K 38K 166960K 154 0 ioctlops 0 0K 4K 166960K 1734 0 iov 0 0K 24K 166960K 24 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1342 84K 85K 166960K 1621 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 123 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 614 0 sigio 0 0K 0K 166960K 11 0 proc 73 115K 147K 166960K 581 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 53 0 in_multi 78 5K 6K 166960K 114 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 494 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 263 171K 197K 166960K 7580 0 UVM aobj 12 4K 6K 166960K 14 0 pinsyscall 44 88K 104K 166960K 1747 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 47 0 NDP 11 0K 1K 166960K 40 0 temp 79 8680K 8764K 166960K 26079 0 kqueue 16 23K 32K 166960K 114 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 120 128 0 124 3 1 2 2 0 8 1 rtentry 176 115 0 31 5 0 5 5 0 8 0 unpcb 144 450 0 431 6 4 2 6 0 8 1 syncache 336 7 0 7 2 2 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 176 0 170 7 5 2 7 0 8 1 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 537 0 526 7 5 2 7 0 8 0 nd6 152 22 0 3 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 37 0 37 3 2 1 1 0 8 1 pppxif 1504 6 0 6 2 1 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 7 0 1 2 1 1 1 0 482 0 pffrnode 88 4 0 1 2 1 1 1 0 8 0 pffrent 40 15 0 8 2 1 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 pfstitem 24 44 0 17 1 0 1 1 0 8 0 pfstkey 128 46 0 19 2 0 2 2 0 8 0 pfstate 448 45 0 18 5 0 5 5 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 486 0 127 28 1 27 28 0 8 1 art_table 40 489 0 127 5 0 5 5 0 8 0 art_node 32 115 0 39 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 120 0 110 1 0 1 1 0 8 0 shmpl 112 9 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2442 0 937 95 0 95 95 0 8 0 ffsino 296 2442 0 937 117 0 117 117 0 8 0 nchpl 144 3323 0 1625 64 0 64 64 0 8 0 rtmask 32 3 0 3 2 2 0 1 0 8 0 vnodes 216 2620 0 0 146 0 146 146 0 8 0 namei 1024 10867 0 10867 3 2 1 2 0 8 1 percpumem 16 92 0 43 1 0 1 1 0 8 0 vcpupl 3968 1 0 0 1 0 1 1 0 8 0 vmpool 840 2 0 1 1 0 1 1 0 8 0 kstatmem 264 50 0 26 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 15611 0 15610 13 10 3 8 1 8 2 plimitpl 152 168 0 149 1 0 1 1 0 8 0 sigapl 424 930 0 881 7 0 7 7 0 8 0 knotepl 120 433 0 0 14 0 14 14 0 8 0 kqueuepl 224 278 0 266 5 3 2 5 0 8 1 pipepl 344 159 0 131 3 0 3 3 0 8 0 fdescpl 528 910 0 878 3 0 3 3 0 8 0 filepl 160 4880 0 4648 16 4 12 16 0 8 1 lockfpl 104 167 0 161 1 0 1 1 0 8 0 lockfspl 48 75 0 72 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 786 0 773 1 0 1 1 0 8 0 zombiepl 144 884 0 881 2 1 1 1 0 8 0 processpl 1232 930 0 881 5 0 5 5 0 8 0 procpl 664 1828 0 1771 6 0 6 6 0 8 0 sosppl 176 5 0 5 1 1 0 1 0 8 0 sockpl 752 1130 0 1096 19 11 8 18 0 8 4 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 34 0 0 5 1 4 5 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 227 0 0 14 0 14 14 0 8 0 bufpl 280 7957 0 1821 439 0 439 439 0 8 0 anonpl 32 12604 0 0 102 0 102 102 0 246 0 amapchunkpl 152 25064 0 24540 35 5 30 34 0 158 6 amappl16 200 3688 0 3657 32 19 13 23 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 16 0 16 1 1 0 1 0 8 0 amappl13 176 422 0 420 1 0 1 1 0 8 0 amappl12 168 1275 0 1231 3 0 3 3 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 46 0 32 1 0 1 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 28 0 26 1 0 1 1 0 8 0 amappl7 128 80 0 79 1 0 1 1 0 8 0 amappl6 120 275 0 260 1 0 1 1 0 8 0 amappl5 112 85 0 75 1 0 1 1 0 8 0 amappl4 104 431 0 399 1 0 1 1 0 8 0 amappl3 96 4608 0 4493 5 1 4 4 0 8 0 amappl2 88 546 0 484 2 0 2 2 0 8 0 amappl1 80 11784 0 11169 15 0 15 15 0 8 0 amappl 88 6769 0 6591 5 0 5 5 0 92 0 uvmvnodes 80 116 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 13 0 2 1 0 1 1 0 8 0 uaddrrnd 24 910 0 878 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 910 0 878 1 0 1 1 0 8 0 vmmpekpl 168 9216 0 9178 3 0 3 3 0 8 0 vmmpepl 168 65713 0 63743 110 4 106 106 0 357 9 vmsppl 488 909 0 878 5 0 5 5 0 8 0 rwobjpl 80 21005 0 19892 34 2 32 32 0 8 3 pdppl 4096 1832 0 1759 105 28 77 84 0 8 4 pvpl 32 20236 0 0 163 0 163 163 0 265 0 pmappl 256 911 0 879 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 295 0 41 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837e2ff0) 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(ffffffff838c4a40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838c4a40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c433660,ffff80000006b400) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838c4a40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838c4a40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 filt_procattach(fffffd806c759530) at filt_procattach+0x139 sys/kern/kern_event.c:375 kqueue_register(fffffd8070304e00,ffff80003c433870,0,ffff8000fffee2b0) at kqueue_register+0xc87 filter_attach sys/kern/kern_event.c:1009 [inline] kqueue_register(fffffd8070304e00,ffff80003c433870,0,ffff8000fffee2b0) at kqueue_register+0xc87 sys/kern/kern_event.c:1491 sys_kevent(ffff8000fffee2b0,ffff80003c433bf0,ffff80003c433b40) at sys_kevent+0x3bc sys/kern/kern_event.c:1285 syscall(ffff80003c433bf0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433bf0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ec97b12000, count: -12 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{1}> trace witness_checkorder(dead4110dead4228,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(dead4110dead4218) at mtx_enter+0x95 sys/kern/kern_lock.c:406 prsignal(dead4110dead4110,14) at prsignal+0x36 sys/kern/kern_sig.c:904 reaper(ffff8000ffffd760) at reaper+0x2ec sys/kern/kern_exit.c:516 end trace frame: 0x0, count: -4