ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(ffffffff826ab340,9,0) at witness_checkorder+0x1049 rw_enter_write(ffffffff826ab330) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:127 uvn_get(fffffd8069b71a78,0,ffff800023506b48,ffff800023506b2c,0,1) at uvn_get+0xeb uvm_vnode_lock sys/uvm/uvm_vnode.c:1501 [inline] uvn_get(fffffd8069b71a78,0,ffff800023506b48,ffff800023506b2c,0,1) at uvn_get+0xeb sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800023506cc0,ffff800023506cf8,ffff800023506bc0,0,1) at uvm_fault_lower+0x706 sys/uvm/uvm_fault.c:1126 uvm_fault(fffffd8065d7ba20,20000000,0,1) at uvm_fault+0x16f sys/uvm/uvm_fault.c:956 kpageflttrap(ffff800023506e50,20000000) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff800023506e50) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_connect(ffff80002123ca58,ffff800023507018,ffff800023507060) at sys_connect+0x9b sys/kern/uipc_syscalls.c:362 syscall(ffff8000235070e0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000235070e0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf942abbeef0, count: -13 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800023506930 rbx 0x3 rdx 0xffff800000ac3840 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff81520b5f witness_checkorder+0x101f r9 0x5 r10 0x28f4c52e60adfe8d r11 0x1645f9416a1a46cb r12 0xffffffff82805c70 w_lodata+0x43ad0 r13 0xffffffff826ab340 netlock+0x10 r14 0xffffffff828040f0 w_lodata+0x41f50 r15 0xfffffd8002ccb600 rip 0xffffffff81e5c848 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023506920 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=82329 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002123dc48,0xffff80002123cf88 process=0xffff8000212358d0 user=0xffff800023502000, vmspace=0xfffffd8065d7ba20 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 46301 207686 25737 0 2 0 syz-executor.0 46301 503715 25737 0 2 0x4000000 syz-executor.0 35447 221611 89149 0 7 0 syz-executor.1 *35447 82329 89149 0 7 0x4000000 syz-executor.1 25737 265491 1080 0 3 0x82 nanosleep syz-executor.0 89149 192410 1080 0 3 0x82 nanosleep syz-executor.1 32367 66283 0 0 3 0x14200 acct acct 78786 478318 1 0 3 0x100083 ttyin getty 9825 182207 0 0 3 0x14200 bored sosplice 1080 431805 31689 0 3 0x82 thrsleep syz-fuzzer 1080 303232 31689 0 3 0x4000082 nanosleep syz-fuzzer 1080 77911 31689 0 3 0x4000082 thrsleep syz-fuzzer 1080 29156 31689 0 3 0x4000082 thrsleep syz-fuzzer 1080 303184 31689 0 3 0x4000082 thrsleep syz-fuzzer 1080 13981 31689 0 3 0x4000082 kqread syz-fuzzer 1080 342598 31689 0 3 0x4000082 thrsleep syz-fuzzer 1080 462740 31689 0 3 0x4000082 thrsleep syz-fuzzer 31689 263940 75784 0 3 0x10008a pause ksh 75784 194276 32135 0 3 0x92 select sshd 32135 455245 1 0 3 0x80 select sshd 56839 73839 51909 74 3 0x100092 bpf pflogd 51909 298817 1 0 3 0x80 netio pflogd 68047 130746 51969 73 3 0x100090 kqread syslogd 51969 271905 1 0 3 0x100082 netio syslogd 89385 173496 1 77 3 0x100090 poll dhclient 83911 257777 1 0 3 0x80 poll dhclient 84379 310139 0 0 3 0x14200 bored smr 62024 388727 0 0 2 0x14200 zerothread 47993 21448 0 0 3 0x14200 aiodoned aiodoned 26494 421413 0 0 3 0x14200 syncer update 24831 447294 0 0 3 0x14200 cleaner cleaner 86797 481368 0 0 3 0x14200 reaper reaper 76912 223282 0 0 3 0x14200 pgdaemon pagedaemon 40527 268243 0 0 3 0x14200 bored crynlk 45400 376373 0 0 3 0x14200 bored crypto 85064 279913 0 0 3 0x14200 bored viomb 82770 388359 0 0 3 0x40014200 acpi0 acpi0 69748 165424 0 0 3 0x40014200 idle1 67499 157387 0 0 3 0x14200 bored softnet 76021 255216 0 0 3 0x14200 bored systqmp 52343 179500 0 0 3 0x14200 bored systq 64366 202105 0 0 3 0x40014200 bored softclock 84502 377223 0 0 3 0x40014200 idle0 1 163978 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 35447 (syz-executor.1) thread 0xffff80002123ca58 (82329) exclusive rrwlock inode r = 0 (0xfffffd806ed454d8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 rw_enter+0x446 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 uvn_get+0xd7 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] #5 uvn_get+0xd7 sys/uvm/uvm_vnode.c:993 #6 uvm_fault_lower+0x706 sys/uvm/uvm_fault.c:1126 #7 uvm_fault+0x16f sys/uvm/uvm_fault.c:956 #8 kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 #9 kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 #10 alltraps_kern_meltdown+0x7b #11 copyin+0x53 #12 sys_connect+0x9b sys/kern/uipc_syscalls.c:362 #13 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #14 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828b5548) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:590 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9593 6652K 7470K 78643K 17975 0 pcb 13 8K 8K 78643K 306 0 rtable 100 12K 15K 78643K 1266 0 ifaddr 102 18K 19K 78643K 480 0 sysctl 2 0K 1K 78643K 3 0 counters 45 34K 34K 78643K 195 0 ioctlops 0 0K 4K 78643K 1783 0 iov 0 0K 16K 78643K 226 0 mount 1 1K 1K 78643K 1 0 vnodes 1226 77K 78K 78643K 3768 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 26 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 378 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1825 197K 290K 78643K 13109 0 file desc 6 17K 25K 78643K 6614 0 sigio 0 0K 0K 78643K 27 0 proc 62 63K 95K 78643K 1087 0 subproc 32 2K 2K 78643K 155 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 416 0 in_multi 30 2K 2K 78643K 404 0 ether_multi 1 0K 0K 78643K 81 0 mrt 0 0K 0K 78643K 12 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 2K 78643K 785 0 pfkey data 0 0K 1K 78643K 10 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 223 155K 156K 78643K 16772 0 UVM aobj 47 7K 7K 78643K 48 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 364 0 NDP 19 0K 0K 78643K 121 0 temp 159 3975K 4039K 78643K 44052 0 kqueue 3 4K 22K 78643K 367 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 21 0 15 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 214 0 212 1 0 1 1 0 8 0 rtentry 112 169 0 135 2 0 2 2 0 8 0 unpcb 120 1483 0 1472 2 1 1 2 0 8 0 syncache 296 69 0 69 12 12 0 1 0 8 0 tcpqe 32 372 0 372 6 6 0 1 0 8 0 tcpcb 736 1150 0 1142 12 10 2 4 0 8 0 inpcb 296 2653 0 2644 11 9 2 2 0 8 1 rttmr 72 10 0 10 3 3 0 1 0 8 0 nd6 48 37 0 30 1 0 1 1 0 8 0 pkpcb 40 19 0 19 5 5 0 1 0 8 0 kcovpl 48 9 0 7 1 0 1 1 0 8 0 swfcl 56 10 0 0 1 0 1 1 0 8 0 ppxss 1128 31 0 30 1 0 1 1 0 8 0 pffrag 232 2 0 2 1 1 0 1 0 482 0 pffrnode 88 2 0 2 1 1 0 1 0 8 0 pffrent 40 8 0 8 3 3 0 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 pfrktable 1344 34 0 32 1 0 1 1 0 8 0 pfstitem 24 14 0 12 1 0 1 1 0 8 0 pfstkey 112 14 0 12 1 0 1 1 0 8 0 pfstate 328 14 0 12 2 1 1 2 0 8 0 pfrule 1360 138 0 118 3 1 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 842 0 657 20 8 12 14 0 8 0 art_table 32 843 0 657 2 0 2 2 0 8 0 art_node 16 166 0 138 1 0 1 1 0 8 0 sysvmsgpl 40 46 0 34 2 1 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 376 0 366 1 0 1 1 0 8 0 shmpl 112 45 0 1 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 9565 0 8154 92 3 89 90 0 8 0 ffsino 272 9565 0 8154 96 1 95 96 0 8 0 nchpl 144 17211 0 15624 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 43902 0 43902 1 0 1 1 0 8 1 percpumem 16 108 0 75 1 0 1 1 0 8 0 vcpupl 1984 12 0 0 2 0 2 2 0 8 0 vmpool 560 12 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 8 0 8 1 1 0 1 0 8 0 scsiplug 72 10 0 10 3 3 0 1 0 8 0 scxspl 216 54697 0 54697 20 16 4 8 0 8 4 plimitpl 152 253 0 245 1 0 1 1 0 8 0 sigapl 424 6817 0 6782 4 0 4 4 0 8 0 futexpl 56 45358 0 45358 1 0 1 1 0 8 1 knotepl 112 606 0 586 2 1 1 2 0 8 0 kqueuepl 152 3519 0 3517 1 0 1 1 0 8 0 pipepl 304 366 0 355 11 9 2 2 0 8 0 fdescpl 496 6794 0 6777 3 0 3 3 0 8 0 filepl 152 23169 0 23065 7 2 5 6 0 8 0 lockfpl 104 713 0 712 1 0 1 1 0 8 0 lockfspl 48 304 0 303 1 0 1 1 0 8 0 sessionpl 144 26 0 15 1 0 1 1 0 8 0 pgrppl 48 34 0 23 1 0 1 1 0 8 0 ucredpl 96 2844 0 2835 1 0 1 1 0 8 0 zombiepl 144 6782 0 6782 1 0 1 1 0 8 1 processpl 1056 6817 0 6782 3 0 3 3 0 8 0 procpl 656 15488 0 15444 7 3 4 5 0 8 0 sosppl 168 51 0 51 4 4 0 1 0 8 0 sockpl 400 4380 0 4358 17 14 3 6 0 8 0 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 16 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 1 2 3 0 8 0 mcl4k 4096 26 0 0 4 1 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 354 0 0 22 1 21 21 0 8 0 mtagpl 96 274 0 0 7 0 7 7 0 8 0 mbufpl 256 903 0 0 44 0 44 44 0 8 0 bufpl 280 14014 0 7765 447 0 447 447 0 8 0 anonpl 16 557793 0 548225 103 64 39 57 0 124 0 amapchunkpl 152 29031 0 28778 48 36 12 24 0 158 0 amappl16 192 24640 0 24286 73 55 18 35 0 8 0 amappl15 184 1066 0 1064 1 0 1 1 0 8 0 amappl14 176 24 0 18 1 0 1 1 0 8 0 amappl13 168 1527 0 1524 1 0 1 1 0 8 0 amappl12 160 574 0 568 1 0 1 1 0 8 0 amappl11 152 1358 0 1343 1 0 1 1 0 8 0 amappl10 144 16 0 12 1 0 1 1 0 8 0 amappl9 136 2191 0 2191 2 2 0 1 0 8 0 amappl8 128 372 0 269 4 0 4 4 0 8 0 amappl7 120 2509 0 2499 1 0 1 1 0 8 0 amappl6 112 103 0 88 1 0 1 1 0 8 0 amappl5 104 6169 0 6149 1 0 1 1 0 8 0 amappl4 96 2206 0 2177 1 0 1 1 0 8 0 amappl3 88 2876 0 2868 1 0 1 1 0 8 0 amappl2 80 47036 0 46958 3 1 2 3 0 8 0 amappl1 72 212380 0 211878 31 21 10 19 0 8 0 amappl 80 15926 0 15844 2 0 2 2 0 84 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 64 47 0 1 1 0 1 1 0 8 0 uaddrrnd 24 6806 0 6777 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6806 0 6777 1 0 1 1 0 8 0 vmmpekpl 168 37935 0 37895 3 0 3 3 0 8 0 vmmpepl 168 866521 0 864744 150 71 79 89 0 357 1 vmsppl 368 6805 0 6777 3 0 3 3 0 8 0 pdppl 4096 13619 0 13566 69 16 53 53 0 8 0 pvpl 32 2416596 0 2403568 284 166 118 149 0 265 12 pmappl 232 6805 0 6777 3 1 2 2 0 8 0 extentpl 40 57 0 39 1 0 1 1 0 8 0 phpool 112 398 0 58 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8271aff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828b5340) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b5340) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800021ecd250,ffff80000065a300) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge4_untramp() at Xintr_ioapic_edge4_untramp+0x18f end of kernel end trace frame: 0x7f7ffffdc8c0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(ffffffff826ab340,9,0) at witness_checkorder+0x1049 rw_enter_write(ffffffff826ab330) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:127 uvn_get(fffffd8069b71a78,0,ffff800023506b48,ffff800023506b2c,0,1) at uvn_get+0xeb uvm_vnode_lock sys/uvm/uvm_vnode.c:1501 [inline] uvn_get(fffffd8069b71a78,0,ffff800023506b48,ffff800023506b2c,0,1) at uvn_get+0xeb sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800023506cc0,ffff800023506cf8,ffff800023506bc0,0,1) at uvm_fault_lower+0x706 sys/uvm/uvm_fault.c:1126 uvm_fault(fffffd8065d7ba20,20000000,0,1) at uvm_fault+0x16f sys/uvm/uvm_fault.c:956 kpageflttrap(ffff800023506e50,20000000) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff800023506e50) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_connect(ffff80002123ca58,ffff800023507018,ffff800023507060) at sys_connect+0x9b sys/kern/uipc_syscalls.c:362 syscall(ffff8000235070e0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000235070e0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf942abbeef0, count: -13