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}> show kasan No such command 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(ffff800045ffd4c8) at reaper+0x2ec sys/kern/kern_exit.c:518 end trace frame: 0x0, count: -4 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a1f43e0 rbx 0 rdx 0 rcx 0xffff800045ffd4c8 rax 0xffffffff83978ffe cpu_info_full_primary+0x1ffe r8 0x3b9aca00 r9 0 r10 0xab75e52aedf77909 r11 0x358283bc2cb280fb r12 0xdeadbeefdeadc0fe r13 0x9 r14 0xdeadbeefdeadc007 r15 0 rip 0xffffffff82774e85 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a1f4340 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{0}> show proc PROC (reaper) tid=208123 pid=6109 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=0xffff800045fff9f0,0xffff800045ffd240 process=0xffff800045ffb9c0 user=0xffff80002a1ef000, vmspace=0xffffffff83ad9800 estcpu=1, cpticks=4, pctcpu=0.1, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 46756 273022 38743 32767 3 0x10 0x80 nanoslp syz-executor 46756 243472 38743 32767 3 0x10 0x4000080 fsleep syz-executor 46756 511463 38743 32767 7 0x10 0x4000000 syz-executor 46756 78022 38743 32767 3 0x10 0x4000080 fsleep syz-executor 57201 475795 82496 32767 2 0x10 0xc80 syz-executor 57201 401107 82496 32767 3 0x10 0x4000080 fsleep syz-executor 57201 307561 82496 32767 3 0x10 0x4000080 fsleep syz-executor 57201 250835 82496 32767 3 0x10 0x4000080 pipewr syz-executor 68970 314270 95511 32767 3 0x10 0x80 nanoslp syz-executor 68970 376358 95511 32767 3 0x10 0x4000080 kqread syz-executor 68970 73550 95511 32767 3 0x10 0x4000080 fsleep syz-executor 1900 332922 21042 0 3 0x100002 0x80 sbwait ndp 21042 50975 46500 0 3 0x100002 0x88 sigsusp sh 26439 130905 89451 32767 3 0x10 0x80 nanoslp syz-executor 80432 422739 13988 32767 2 0x10 0xc80 syz-executor 82881 406261 7824 32767 3 0x10 0x80 nanoslp syz-executor 82496 106178 80091 32767 3 0x10 0x80 nanoslp syz-executor 38743 186097 72987 32767 2 0x10 0xc80 syz-executor 46500 440250 95762 0 3 0 0x80 wait syz-executor 95511 63117 18724 32767 2 0x10 0xc80 syz-executor 776 422769 84533 32767 2 0x10 0 syz-executor 89451 480126 14015 0 3 0x2 0x80 wait syz-executor 13988 478749 14015 0 3 0x2 0x80 wait syz-executor 7824 106369 14015 0 3 0x2 0x80 wait syz-executor 72987 179142 14015 0 3 0x2 0x80 wait syz-executor 18724 321253 14015 0 3 0x2 0x80 wait syz-executor 84533 202921 14015 0 3 0x2 0x80 wait syz-executor 80091 360898 14015 0 3 0x2 0x80 wait syz-executor 95762 251673 14015 0 3 0x2 0x80 wait syz-executor 14015 380368 95138 0 3 0x2 0x80 kqread syz-executor 95138 443142 39999 0 3 0x100002 0x88 sigsusp ksh 39999 275462 29092 0 3 0x10 0x88 kqread sshd-session 29092 522647 71934 0 3 0x12 0x80 kqread sshd-session 100 6446 1 0 3 0x100003 0x80 ttyin getty 71934 380716 1 0 3 0 0x88 kqread sshd 84477 291224 2607 73 3 0x1100010 0x80 kqread syslogd 2607 228138 1 0 3 0x100002 0x80 sbwait syslogd 32116 353281 1 0 3 0x100000 0x80 kqread resolvd 8352 439421 1462 77 3 0x100012 0x80 kqread dhcpleased 23574 107783 1462 77 3 0x100012 0x80 kqread dhcpleased 1462 420881 1 0 3 0 0x80 kqread dhcpleased 15241 423383 0 0 3 0x14000 0x200 bored smr 6911 157347 0 0 2 0x14000 0x200 zerothread 17188 406342 0 0 3 0x14000 0x200 aiodoned aiodoned 88269 343004 0 0 3 0x14000 0x200 syncer update 22042 474272 0 0 3 0x14000 0x200 cleaner cleaner * 6109 208123 0 0 7 0x14000 0x200 reaper 50441 521726 0 0 3 0x14000 0x200 pgdaemon pagedaemon 17295 204708 0 0 3 0x14000 0x200 bored viomb 64135 198667 0 0 3 0x14000 0x40000200 acpi0 acpi0 90636 113357 0 0 3 0x14000 0x40000200 idle1 52316 244282 0 0 3 0x14000 0x200 bored softnet1 82486 252721 0 0 2 0x14000 0x200 softnet0 46210 293969 0 0 3 0x14000 0x200 bored systqmp 22669 167274 0 0 3 0x14000 0x200 bored systq 92110 511763 0 0 3 0x14000 0x200 tmoslp softclockmp 25077 194445 0 0 3 0x14000 0x40000200 tmoslp softclock 42544 75520 0 0 3 0x14000 0x40000200 idle0 1 383181 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 46756 (syz-executor) thread 0xffff800045fe7a10 (511463) shared rwlock vmmaplk r = 0 (0xffffef006ceb6130) #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:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #6 kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 Process 776 (syz-executor) thread 0xffff800045fee548 (422769) exclusive rrwlock inode r = 0 (0xffffef007d73fc50) #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:692 #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:1807 #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 (0xffffef006d5a7678) #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:1807 #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 6109 (reaper) thread 0xffff800045ffd4c8 (208123) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a3d100) #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:515 #6 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11053 12018K 12034K 166960K 12144 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 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 39 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1288 81K 81K 166960K 1363 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 11 1K 1K 166960K 11 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 25 93K 121K 166960K 254 0 sigio 0 0K 0K 166960K 1 0 proc 58 99K 147K 166960K 506 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 2 0K 0K 166960K 18 0 in_multi 100 7K 7K 166960K 100 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 442 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 255 153K 170K 166960K 3919 0 UVM aobj 9 2K 2K 166960K 10 0 pinsyscall 47 94K 112K 166960K 1357 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 11 0K 2K 166960K 27 0 temp 41 9115K 9120K 166960K 3952 0 kqueue 16 22K 25K 166960K 57 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 46 0 42 1 0 1 1 0 8 0 rtentry 176 113 0 1 6 0 6 6 0 8 0 unpcb 144 85 0 70 1 0 1 1 0 8 0 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 112 0 107 7 0 7 7 0 8 6 arp 136 19 0 0 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 6 0 1 1 0 1 1 0 8 0 inpcb 328 285 0 275 12 3 9 12 0 8 7 nd6 152 25 0 0 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 256 470 0 0 30 0 30 30 0 8 0 art_table 40 471 0 0 5 0 5 5 0 8 0 art_node 32 113 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 9 0 0 1 0 1 1 0 8 0 shmpl 112 7 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1713 0 252 92 0 92 92 0 8 0 ffsino 296 1713 0 252 113 0 113 113 0 8 0 nchpl 144 2115 0 423 63 0 63 63 0 8 0 vnodes 216 1794 0 0 100 0 100 100 0 8 0 namei 1024 6464 0 6464 2 0 2 2 0 8 2 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 25 0 0 2 0 2 2 0 8 0 scxspl 216 7351 0 7351 11 3 8 8 1 8 8 plimitpl 152 47 0 22 2 0 2 2 0 8 1 sigapl 424 553 0 499 7 0 7 7 0 8 0 knotepl 120 304 0 0 10 0 10 10 0 8 0 kqueuepl 224 94 0 50 3 0 3 3 0 8 0 pipepl 344 137 0 108 3 0 3 3 0 8 0 fdescpl 528 537 0 500 3 0 3 3 0 8 0 filepl 160 2231 0 1975 15 0 15 15 0 8 3 lockfpl 104 25 0 23 1 0 1 1 0 8 0 lockfspl 48 11 0 9 1 0 1 1 0 8 0 sessionpl 144 31 0 15 1 0 1 1 0 8 0 pgrppl 48 41 0 17 1 0 1 1 0 8 0 ucredpl 104 263 0 245 1 0 1 1 0 8 0 zombiepl 144 502 0 499 1 0 1 1 0 8 0 processpl 1232 553 0 499 5 0 5 5 0 8 0 procpl 664 741 0 678 7 0 7 7 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 417 0 388 16 4 12 16 0 8 8 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mextrefs 64 19 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1207 0 0 76 0 76 76 0 8 0 bufpl 272 2426 0 102 155 0 155 155 0 8 0 anonpl 32 5524 0 0 45 0 45 45 0 247 0 amapchunkpl 152 11867 0 11308 38 0 38 38 0 158 14 amappl16 200 1894 0 1858 5 2 3 5 0 8 1 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 415 0 413 1 0 1 1 0 8 0 amappl13 176 117 0 106 1 0 1 1 0 8 0 amappl12 168 769 0 734 2 0 2 2 0 8 0 amappl11 160 21 0 20 1 0 1 1 0 8 0 amappl10 152 61 0 51 1 0 1 1 0 8 0 amappl9 144 268 0 268 1 1 0 1 0 8 0 amappl8 136 106 0 105 1 0 1 1 0 8 0 amappl7 128 146 0 133 1 0 1 1 0 8 0 amappl6 120 155 0 153 1 0 1 1 0 8 0 amappl5 112 99 0 91 1 0 1 1 0 8 0 amappl4 104 275 0 257 1 0 1 1 0 8 0 amappl3 96 2174 0 2041 5 1 4 4 0 8 0 amappl2 88 519 0 465 2 0 2 2 0 8 0 amappl1 80 10683 0 10078 14 0 14 14 0 8 0 amappl 88 3210 0 3023 5 0 5 5 0 92 0 uvmvnodes 80 101 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 9 0 1 1 0 1 1 0 8 0 uaddrrnd 24 537 0 500 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 537 0 500 1 0 1 1 0 8 0 vmmpekpl 168 6049 0 6011 2 0 2 2 0 8 0 vmmpepl 168 43141 0 41070 96 0 96 96 0 357 1 vmsppl 488 536 0 499 7 1 6 6 0 8 0 rwobjpl 80 15362 0 14326 22 0 22 22 0 8 0 pdppl 4096 1081 0 998 113 28 85 95 0 8 2 pvpl 32 13428 0 0 109 0 109 109 0 265 0 pmappl 256 536 0 499 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 507 0 31 14 0 14 14 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(ffff800045ffd4c8) at reaper+0x2ec sys/kern/kern_exit.c:518 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 stacktrace_save_at(ffffef00046d92c0,0) at stacktrace_save_at+0x12d sys/arch/amd64/amd64/db_trace.c:285 witness_lock(ffffef006ceb6130,1) at witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] witness_lock(ffffef006ceb6130,1) at witness_lock+0x5f1 sys/kern/subr_witness.c:1160 rw_do_enter_read(ffffef006ceb6118,0) at rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 uvmfault_lookup(ffff80003c441380,0) at uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 uvm_fault_check(ffff80003c441380,ffff80003c4413b8,ffff80003c4413f0,0) at uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 uvm_fault(ffffef006ceb6030,f000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627 kpageflttrap(ffff80003c441530,f540) at kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 kerntrap(ffff80003c441530) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x64 syscall(ffff80003c441970) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c441970) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x48730a382b0, count: -16