login: witness: lock order reversal: 1st 0xfffffd8069796e90 vmmaplk (&map->lock) 2nd 0xfffffd8067cdf448 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 fill_file+0xad2 sys/kern/kern_sysctl.c:1304 #2 sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 #3 kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 #4 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd8067cdf448,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8067cdf448,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8067cdf438) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000bd4c00,fffffd80691a9730,fffffd8067cdf3f0,0,0,ffff8000fffe8870,390a1d21dea93f70,4a00,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff800029504128,4,20000080,ffff800029504158,ffff80002af2f500) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff800029504124,5,20000080,ffff800029504158,0,0,f116a2e35ac8060c) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002af2f500,ffff8000295041c8,ffff800029504220) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff800029504290) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800029504290) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaa063f5e910, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800029503a90 rbx 0x3 rdx 0xffff800000bccec0 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff800029503a00 r9 0x8080808080808080 r10 0xedea447ad5275aca r11 0x38c1e2d287438d3b r12 0xffffffff82aac440 w_lodata+0x4ead0 r13 0 r14 0xffffffff82aaa1e0 w_lodata+0x4c870 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800029503a80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.3) pid=289949 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002af2f260,0xffff80002af2ea90 process=0xffff8000fffeb628 user=0xffff8000294ff000, vmspace=0xfffffd8069796e78 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9126 492922 17190 32767 2 0x10 syz-executor.1 9126 226357 17190 32767 2 0x4000010 syz-executor.1 44955 214337 41181 32767 2 0x10 syz-executor.7 44955 166990 41181 32767 3 0x4000090 fsleep syz-executor.7 71301 412172 19818 32767 2 0x10 syz-executor.6 71301 172276 19818 32767 7 0x4000010 syz-executor.6 41070 298153 58670 32767 2 0x10 syz-executor.0 41070 214758 58670 32767 3 0x4000090 fsleep syz-executor.0 37885 39527 51239 32767 2 0x10 syz-executor.3 *37885 289949 51239 32767 7 0x4000010 syz-executor.3 57168 143170 0 0 3 0x14200 bored sosplice 41181 475988 1625 32767 3 0x90 nanoslp syz-executor.7 19818 249640 36281 32767 3 0x90 nanoslp syz-executor.6 1625 478062 47417 0 3 0x82 wait syz-executor.7 13846 375489 9978 32767 3 0x10 biowait syz-executor.5 36281 135126 47417 0 3 0x82 wait syz-executor.6 41360 16904 58526 32767 3 0x90 nanoslp syz-executor.4 9978 310555 47417 0 3 0x82 wait syz-executor.5 51239 483126 59594 32767 3 0x90 nanoslp syz-executor.3 58526 322031 47417 0 3 0x82 wait syz-executor.4 67830 37971 48496 32767 2 0x10 syz-executor.2 59594 477856 47417 0 3 0x82 wait syz-executor.3 17190 443850 43283 32767 3 0x90 nanoslp syz-executor.1 48496 501117 47417 0 3 0x82 wait syz-executor.2 43283 61926 47417 0 3 0x82 wait syz-executor.1 58670 467313 40895 32767 3 0x90 nanoslp syz-executor.0 40895 161080 47417 0 3 0x82 wait syz-executor.0 47417 448375 98633 0 3 0x82 thrsleep syz-fuzzer 47417 340324 98633 0 3 0x4000082 nanoslp syz-fuzzer 47417 319173 98633 0 3 0x4000082 thrsleep syz-fuzzer 47417 175940 98633 0 3 0x4000082 kqread syz-fuzzer 47417 201151 98633 0 3 0x4000082 thrsleep syz-fuzzer 47417 508043 98633 0 3 0x4000082 thrsleep syz-fuzzer 47417 399044 98633 0 3 0x4000082 thrsleep syz-fuzzer 47417 445295 98633 0 3 0x4000082 thrsleep syz-fuzzer 47417 206761 98633 0 3 0x4000082 thrsleep syz-fuzzer 98633 369893 30666 0 3 0x10008a sigsusp ksh 30666 73123 7059 0 3 0x9a kqread sshd 48816 511627 1 0 3 0x100083 ttyin getty 7059 156248 1 0 3 0x88 kqread sshd 22416 391739 42870 73 3 0x1100090 kqread syslogd 42870 299364 1 0 3 0x100082 netio syslogd 79759 144328 1 0 3 0x100080 kqread resolvd 11424 104490 47706 77 3 0x100092 kqread dhcpleased 21195 374060 47706 77 3 0x100092 kqread dhcpleased 47706 35804 1 0 3 0x80 kqread dhcpleased 37845 346350 0 0 3 0x14200 bored smr 11271 91615 0 0 2 0x14200 zerothread 32780 481343 0 0 3 0x14200 aiodoned aiodoned 25342 441576 0 0 3 0x14200 syncer update 79604 154762 0 0 3 0x14200 cleaner cleaner 68374 435449 0 0 3 0x14200 reaper reaper 84502 240666 0 0 3 0x14200 pgdaemon pagedaemon 76922 368865 0 0 3 0x14200 bored viomb 23641 316185 0 0 3 0x40014200 acpi0 acpi0 55457 130252 0 0 3 0x40014200 idle1 68413 39084 0 0 3 0x14200 bored softnet 86959 222729 0 0 3 0x14200 bored systqmp 91336 216102 0 0 3 0x14200 bored systq 56121 287862 0 0 3 0x40014200 bored softclock 9728 454834 0 0 3 0x40014200 idle0 1 463163 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 37885 (syz-executor.3) thread 0xffff80002af2f500 (289949) shared rwlock vmmaplk r = 0 (0xfffffd8069796e90) #0 witness_lock+0x44d #1 uvm_vslock+0xc8 sys/uvm/uvm_glue.c:129 #2 sys_sysctl+0x2d8 sys/kern/kern_sysctl.c:240 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff82941f10) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 13846 (syz-executor.5) thread 0xffff8000fffeea88 (375489) exclusive rrwlock inode r = 0 (0xfffffd8072ed30a8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:677 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561 #11 namei+0x36a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1850 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8067bec2c0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1850 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 Process 67830 (syz-executor.2) thread 0xffff8000ffff6d30 (37971) exclusive rrwlock inode r = 0 (0xfffffd8072ed32c8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3101 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e6106f8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3086 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10170 6407K 6419K 78643K 11260 0 pcb 13 8K 8K 78643K 13 0 rtable 240 6K 7K 78643K 358 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 34 0 iov 0 0K 12K 78643K 3 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1270 79K 79K 78643K 1285 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 3 0K 0K 78643K 3 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 117K 78643K 414 0 sigio 0 0K 0K 78643K 1 0 proc 56 74K 99K 78643K 451 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 3 0 in_multi 99 6K 6K 78643K 100 0 ether_multi 1 0K 0K 78643K 2 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 2K 78643K 632 0 tdb 3 0K 0K 78643K 3 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 301 78K 80K 78643K 6405 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2 0 NDP 11 0K 2K 78643K 27 0 temp 88 4694K 4757K 78643K 4905 0 kqueue 12 18K 20K 78643K 40 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 37 0 34 1 0 1 1 0 8 0 rtentry 112 112 0 1 4 0 4 4 0 8 0 unpcb 136 48 0 35 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 104 0 104 1 0 1 1 0 8 1 tcpcb 736 25 0 19 1 0 1 1 0 8 0 arp 120 18 0 0 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 304 93 0 86 1 0 1 1 0 8 0 ip6q 72 6 0 2 1 0 1 1 0 8 0 ip6af 40 8 0 4 1 0 1 1 0 8 0 nd6 48 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 256 458 0 0 29 0 29 29 0 8 0 art_table 32 459 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1771 0 343 90 0 90 90 0 8 0 ffsino 272 1771 0 343 96 0 96 96 0 8 0 nchpl 144 2329 0 669 62 0 62 62 0 8 0 uvmvnodes 80 1884 0 0 39 0 39 39 0 8 0 vnodes 224 1884 0 0 111 0 111 111 0 8 0 namei 1024 7179 0 7178 2 0 2 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 7025 0 7024 2 1 1 2 0 8 0 plimitpl 152 32 0 10 1 0 1 1 0 8 0 sigapl 424 702 0 652 7 0 7 7 0 8 1 futexpl 64 1044 0 1042 1 0 1 1 0 8 0 knotepl 120 301 0 0 10 0 10 10 0 8 0 kqueuepl 216 54 0 46 1 0 1 1 0 8 0 pipepl 336 137 0 109 3 0 3 3 0 8 0 fdescpl 496 687 0 653 7 1 6 6 0 8 1 filepl 152 2061 0 1828 10 0 10 10 0 8 1 lockfpl 104 25 0 23 1 0 1 1 0 8 0 lockfspl 48 13 0 11 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 96 133 0 115 1 0 1 1 0 8 0 zombiepl 144 653 0 652 1 0 1 1 0 8 0 processpl 1064 702 0 652 5 1 4 4 0 8 0 procpl 672 1016 0 953 7 0 7 7 0 8 1 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 480 194 0 171 4 0 4 4 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 158 0 0 19 0 19 19 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 334 0 0 21 0 21 21 0 8 0 bufpl 288 3857 0 137 266 0 266 266 0 8 0 anonpl 24 154988 0 142672 108 4 104 105 0 186 21 amapchunkpl 152 14735 0 14018 34 2 32 32 0 158 1 amappl16 200 1908 0 1593 31 1 30 30 0 8 8 amappl15 192 163 0 157 1 0 1 1 0 8 0 amappl14 184 53 0 49 1 0 1 1 0 8 0 amappl13 176 149 0 143 1 0 1 1 0 8 0 amappl12 168 53 0 48 1 0 1 1 0 8 0 amappl11 160 88 0 74 1 0 1 1 0 8 0 amappl10 152 82 0 73 1 0 1 1 0 8 0 amappl9 144 517 0 512 1 0 1 1 0 8 0 amappl8 136 561 0 515 2 0 2 2 0 8 0 amappl7 128 116 0 108 1 0 1 1 0 8 0 amappl6 120 266 0 241 2 1 1 2 0 8 0 amappl5 112 443 0 422 1 0 1 1 0 8 0 amappl4 104 880 0 851 2 1 1 2 0 8 0 amappl3 96 244 0 226 1 0 1 1 0 8 0 amappl2 88 597 0 551 3 1 2 3 0 8 0 amappl1 80 15130 0 14511 18 3 15 18 0 8 0 amappl 88 5962 0 5724 8 1 7 7 0 92 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 687 0 653 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 687 0 653 1 0 1 1 0 8 0 vmmpekpl 168 9345 0 9303 3 0 3 3 0 8 1 vmmpepl 168 65278 0 62825 126 0 126 126 0 357 13 vmsppl 368 686 0 653 4 0 4 4 0 8 0 rwobjpl 56 18597 0 15482 47 0 47 47 0 8 0 pdppl 4096 1381 0 1306 115 34 81 91 0 8 6 pvpl 32 393622 0 376346 244 5 239 243 0 265 87 pmappl 248 686 0 653 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 656 0 36 18 0 18 18 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd8067cdf448,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8067cdf448,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8067cdf438) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000bd4c00,fffffd80691a9730,fffffd8067cdf3f0,0,0,ffff8000fffe8870,390a1d21dea93f70,4a00,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff800029504128,4,20000080,ffff800029504158,ffff80002af2f500) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff800029504124,5,20000080,ffff800029504158,0,0,f116a2e35ac8060c) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002af2f500,ffff8000295041c8,ffff800029504220) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff800029504290) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800029504290) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaa063f5e910, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:144 syscall(ffff80002af22de0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff80002af22de0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x944d8f7c7f0, count: -6