panic: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 188 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 402605 80017 0 0x14000 0x200 0 zerothread db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a340e) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e70b,ffffffff82820902,bc,ffffffff827b65e4) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff800021293ab8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188 exit1(ffff800021298be8,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:220 single_thread_check_locked(ffff800021298be8,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2015 userret(ffff800021298be8) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff800021298be8) at userret+0x7c sys/kern/kern_sig.c:1970 syscall(ffff800026149b60) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800026149b60) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70346fa733e0, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 188 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a340e) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e70b,ffffffff82820902,bc,ffffffff827b65e4) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff800021293ab8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188 exit1(ffff800021298be8,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:220 single_thread_check_locked(ffff800021298be8,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2015 userret(ffff800021298be8) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff800021298be8) at userret+0x7c sys/kern/kern_sig.c:1970 syscall(ffff800026149b60) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800026149b60) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70346fa733e0, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000261497f0 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff800021298be8 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x5216843a50eb42e2 r11 0xa67f6199307df4d5 r12 0xffff800020d599a0 r13 0 r14 0 r15 0x1 rip 0xffffffff81b35ecc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000261497e0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=153925 stat=onproc flags process=1008 proc=82000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021299158,0xffff80002121f8a8 process=0xffff800021293ab8 user=0xffff800026144000, vmspace=0xfffffd806efed578 estcpu=36, cpticks=10, pctcpu=0.2 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58524 497860 30635 0 3 0x80 nanoslp syz-executor.2 58524 31162 30635 0 3 0x4000080 fsleep syz-executor.2 58524 234770 30635 0 3 0x4000080 fsleep syz-executor.2 58524 36928 30635 0 3 0x4000080 fsleep syz-executor.2 60493 110609 6103 0 3 0x80 nanoslp syz-executor.3 60493 240688 6103 0 3 0x4000080 rest syz-executor.3 60493 207524 6103 0 3 0x4000080 fsleep syz-executor.3 51225 437524 22815 0 3 0x2 biowait syz-executor.5 7736 416198 22815 0 3 0x82 piperd syz-executor.4 30635 59414 22815 0 3 0x82 nanoslp syz-executor.2 16372 29443 22815 0 3 0x2 getblk syz-executor.6 5233 400655 22815 0 3 0x82 piperd syz-executor.1 63567 325917 22815 0 3 0x82 nanoslp syz-executor.0 42736 486956 0 0 3 0x14280 nfsidl nfsio 43914 113748 0 0 3 0x14280 nfsidl nfsio 30175 140937 0 0 3 0x14280 nfsidl nfsio 87065 123278 0 0 3 0x14280 nfsidl nfsio 71651 14862 0 0 3 0x14280 nfsidl nfsio 99698 83677 0 0 3 0x14280 nfsidl nfsio 24598 217052 0 0 3 0x14280 nfsidl nfsio 97120 206163 0 0 3 0x14280 nfsidl nfsio 25517 451050 0 0 3 0x14280 nfsidl nfsio 14819 118384 0 0 3 0x14280 nfsidl nfsio 97518 264515 0 0 3 0x14280 nfsidl nfsio 34891 423293 0 0 3 0x14280 nfsidl nfsio 95437 173163 0 0 3 0x14280 nfsidl nfsio 27623 345255 0 0 3 0x14280 nfsidl nfsio 44952 491601 0 0 3 0x14280 nfsidl nfsio 47423 488573 0 0 3 0x14280 nfsidl nfsio 18803 179236 0 0 3 0x14280 nfsidl nfsio 17708 142009 0 0 3 0x14280 nfsidl nfsio 27950 15828 0 0 3 0x14280 nfsidl nfsio 34419 403996 0 0 3 0x14280 nfsidl nfsio 45037 122931 22815 0 3 0x2 biowait syz-executor.7 46331 130728 0 0 3 0x14200 bored sosplice 6103 146977 22815 0 3 0x82 nanoslp syz-executor.3 22815 489940 86443 0 3 0x2000082 thrsleep syz-fuzzer 22815 156391 86443 0 3 0x6000082 thrsleep syz-fuzzer 22815 429198 86443 0 3 0x6000082 wait syz-fuzzer 22815 195828 86443 0 3 0x6000082 wait syz-fuzzer 22815 200279 86443 0 3 0x6000082 kqread syz-fuzzer 22815 136368 86443 0 3 0x6000082 wait syz-fuzzer 22815 455980 86443 0 3 0x6000082 wait syz-fuzzer 22815 45584 86443 0 3 0x6000082 thrsleep syz-fuzzer 22815 155105 86443 0 3 0x6000082 thrsleep syz-fuzzer 22815 371281 86443 0 3 0x6000082 wait syz-fuzzer 22815 467586 86443 0 3 0x6000082 thrsleep syz-fuzzer 22815 312139 86443 0 3 0x6000082 thrsleep syz-fuzzer 22815 244825 86443 0 3 0x6000082 wait syz-fuzzer 22815 390143 86443 0 3 0x6000082 wait syz-fuzzer 22815 456183 86443 0 3 0x6000082 wait syz-fuzzer 22815 228470 86443 0 3 0x6000082 thrsleep syz-fuzzer 86443 391068 99994 0 3 0x10008a sigsusp ksh 99994 216395 34270 0 3 0x9a kqread sshd 40515 312785 1 0 3 0x100083 ttyin getty 34270 260305 1 0 3 0x88 kqread sshd 31227 370822 61693 74 3 0x1100092 bpf pflogd 61693 460324 1 0 3 0x80 netio pflogd 22176 438537 86007 73 3 0x1100090 kqread syslogd 86007 499516 1 0 3 0x100082 netio syslogd 11845 317029 1 0 3 0x100080 kqread resolvd 81672 518016 24605 77 3 0x100092 kqread dhcpleased 17443 53126 24605 77 3 0x100092 kqread dhcpleased 24605 383117 1 0 3 0x80 kqread dhcpleased 32220 425864 0 0 3 0x14200 bored smr 80017 402605 0 0 7 0x14200 zerothread 75019 224448 0 0 3 0x14200 aiodoned aiodoned 11244 340918 0 0 3 0x14200 syncer update 88823 194971 0 0 3 0x14200 cleaner cleaner 31105 414249 0 0 2 0x14200 reaper 48492 238577 0 0 3 0x14200 pgdaemon pagedaemon 21720 358830 0 0 3 0x14200 bored viomb 52464 76455 0 0 3 0x40014200 acpi0 acpi0 34955 315001 0 0 3 0x40014200 idle1 84574 235537 0 0 3 0x14200 bored softnet3 80118 113933 0 0 3 0x14200 bored softnet2 2340 65522 0 0 3 0x14200 bored softnet1 57888 362704 0 0 3 0x14200 bored softnet0 72234 197317 0 0 3 0x14200 bored systqmp 87335 128603 0 0 3 0x14200 bored systq 62388 273659 0 0 3 0x40014200 bored softclock 82823 9970 0 0 3 0x40014200 idle0 1 504024 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 51225 (syz-executor.5) thread 0xffff80002128f338 (437524) Process 16372 (syz-executor.6) thread 0xffff8000212370a0 (29443) Process 45037 (syz-executor.7) thread 0xffff80002128e030 (122931) Process 31105 (reaper) thread 0xffff8000211ad058 (414249) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10231 6555K 7062K 78643K 19562 0 pcb 13 14K 16K 78643K 404 0 rtable 241 7K 7K 78643K 1091 0 pf 32 9K 10K 78643K 167 0 ifaddr 45 16K 17K 78643K 165 0 ifgroup 55 2K 2K 78643K 253 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 36K 78643K 176 0 ioctlops 0 0K 4K 78643K 1663 0 iov 0 0K 24K 78643K 815 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1537 96K 96K 78643K 5736 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 4 9K 13K 78643K 68 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 70 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 12 41K 85K 78643K 10536 0 sigio 0 0K 0K 78643K 171 0 proc 74 115K 128K 78643K 1393 0 subproc 104 6K 6K 78643K 341 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 666 0 in_multi 99 7K 7K 78643K 345 0 ether_multi 1 0K 0K 78643K 1 0 mrt 0 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 193 864K 864K 78643K 193 0 exec 0 0K 1K 78643K 1859 0 pfkey data 0 0K 0K 78643K 3 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 8 62K 64K 78643K 10 0 UVM amap 383 91K 104K 78643K 104370 0 UVM aobj 131 4K 4K 78643K 132 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 186 0 NDP 12 0K 2K 78643K 122 0 temp 77 5920K 6004K 78643K 66470 0 kqueue 12 18K 28K 78643K 1376 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 plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 318 0 315 5 4 1 3 0 8 0 rtentry 112 317 0 205 4 0 4 4 0 8 0 unpcb 144 12933 0 12918 118 116 2 11 0 8 1 syncache 296 44 0 44 15 15 0 1 0 8 0 tcpqe 32 170 0 170 10 10 0 1 0 8 0 tcpcb 808 1376 0 1372 61 60 1 11 0 8 0 arp 120 56 0 38 1 0 1 1 0 8 0 inpcb 368 6960 0 6953 118 116 2 14 0 8 1 nd6 136 84 0 58 2 0 2 2 0 8 0 pkpcb 40 46 0 46 3 3 0 1 0 8 0 kcovpl 48 26 0 18 1 0 1 1 0 8 0 ppxss 1256 21 0 21 7 7 0 1 0 8 0 pffrag 232 35 0 32 4 3 1 1 0 482 0 pffrnode 88 35 0 32 4 3 1 1 0 8 0 pffrent 40 210 0 207 4 3 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 24 223 0 213 1 0 1 1 0 8 0 pfstkey 128 223 0 213 1 0 1 1 0 8 0 pfstate 376 223 0 213 6 4 2 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1278 0 812 32 2 30 30 0 8 0 art_table 32 1279 0 812 4 0 4 4 0 8 0 art_node 16 316 0 214 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 2 2 0 1 0 8 0 semupl 112 8 0 8 1 1 0 1 0 8 0 semapl 112 64 0 54 1 0 1 1 0 8 0 shmpl 112 129 0 1 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 15390 0 13886 95 0 95 95 0 8 0 ffsino 272 15390 0 13886 101 0 101 101 0 8 0 nchpl 144 28469 0 26813 63 0 63 63 0 8 0 uvmvnodes 80 5963 0 0 122 0 122 122 0 8 0 vnodes 216 5963 0 0 332 0 332 332 0 8 0 namei 1024 95714 0 95711 13 10 3 3 0 8 2 percpumem 16 101 0 58 1 0 1 1 0 8 0 kstatmem 264 140 0 116 2 0 2 2 0 8 0 scxspl 216 83384 0 83382 20 19 1 8 1 8 0 plimitpl 152 848 0 832 1 0 1 1 0 8 0 sigapl 424 10835 0 10771 9 1 8 8 0 8 0 futexpl 64 94718 0 94714 5 4 1 1 0 8 0 knotepl 120 710 0 0 12 1 11 11 0 8 0 kqueuepl 216 2009 0 2001 11 10 1 5 0 8 0 pipepl 320 1693 0 1665 46 43 3 8 0 8 0 fdescpl 496 10796 0 10771 6 1 5 5 0 8 1 filepl 152 66664 0 66424 139 129 10 20 0 8 0 lockfpl 104 2876 0 2868 7 6 1 2 0 8 0 lockfspl 48 1051 0 1043 1 0 1 1 0 8 0 sessionpl 144 42 0 25 1 0 1 1 0 8 0 pgrppl 48 202 0 185 1 0 1 1 0 8 0 ucredpl 104 11871 0 11859 2 1 1 2 0 8 0 zombiepl 144 13481 0 13480 3 2 1 1 0 8 0 processpl 1072 10835 0 10771 5 0 5 5 0 8 0 procpl 696 28866 0 28779 34 24 10 11 0 8 0 sosppl 168 1293 0 1293 11 11 0 1 0 8 0 sockpl 488 20262 0 20237 468 462 6 37 0 8 2 mcl64k 65536 33 0 0 3 0 3 3 0 8 0 mcl16k 16384 49 0 0 5 2 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 19 0 0 2 0 2 2 0 8 0 mcl8k 8192 49 0 0 6 3 3 3 0 8 0 mcl4k 4096 49 0 0 5 2 3 3 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 413 0 0 36 15 21 36 0 8 0 mtagpl 96 574 0 0 10 0 10 10 0 8 0 mbufpl 256 1519 0 0 74 0 74 74 0 8 0 bufpl 288 18974 0 12645 453 0 453 453 0 8 0 anonpl 24 1064400 0 1052451 206 102 104 113 0 186 8 amapchunkpl 152 328523 0 327722 94 56 38 48 0 158 1 amappl16 200 19879 0 19510 116 87 29 33 0 8 6 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 240 0 219 3 1 2 2 0 8 0 amappl13 176 25 0 23 2 1 1 1 0 8 0 amappl12 168 11725 0 11695 3 1 2 2 0 8 0 amappl11 160 54 0 39 1 0 1 1 0 8 0 amappl10 152 49 0 36 2 1 1 1 0 8 0 amappl9 144 258 0 258 11 11 0 1 0 8 0 amappl8 136 599 0 474 6 1 5 5 0 8 0 amappl7 128 109 0 94 2 1 1 2 0 8 0 amappl6 120 501 0 466 6 4 2 2 0 8 0 amappl5 112 429 0 417 1 0 1 1 0 8 0 amappl4 104 1881 0 1831 3 1 2 3 0 8 0 amappl3 96 65303 0 65229 4 1 3 3 0 8 0 amappl2 88 11341 0 11267 3 1 2 3 0 8 0 amappl1 80 46316 0 45775 23 10 13 23 0 8 0 amappl 88 103532 0 103302 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 72 131 0 1 3 0 3 3 0 8 0 uaddrrnd 24 10796 0 10770 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10796 0 10770 1 0 1 1 0 8 0 vmmpekpl 168 82627 0 82566 4 0 4 4 0 8 0 vmmpepl 168 639699 0 637430 305 174 131 131 0 357 13 vmsppl 464 10795 0 10770 5 1 4 5 0 8 0 rwobjpl 56 160049 0 152427 121 12 109 111 0 8 0 pdppl 4096 21600 0 21540 507 437 70 80 0 8 10 pvpl 32 2991517 0 2973554 526 331 195 367 0 265 21 pmappl 248 10795 0 10770 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1523 0 656 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c32ff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82c91360) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c91360) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211d1a80,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d uvm_pagezero_thread(ffff8000211ac578) at uvm_pagezero_thread+0x68 sys/uvm/uvm_pmemrange.c:2190 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff82c32ff0) at x86_ipi_db+0x1e 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+0x27 __mp_lock(ffffffff82c91360) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c91360) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000211d1a80,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d uvm_pagezero_thread(ffff8000211ac578) at uvm_pagezero_thread+0x68 sys/uvm/uvm_pmemrange.c:2190 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a340e) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e70b,ffffffff82820902,bc,ffffffff827b65e4) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff800021293ab8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188 exit1(ffff800021298be8,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:220 single_thread_check_locked(ffff800021298be8,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2015 userret(ffff800021298be8) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff800021298be8) at userret+0x7c sys/kern/kern_sig.c:1970 syscall(ffff800026149b60) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800026149b60) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70346fa733e0, count: 6 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a340e) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff8281e70b,ffffffff82820902,bc,ffffffff827b65e4) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff800021293ab8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188 exit1(ffff800021298be8,0,0,3) at exit1+0x3d5 sys/kern/kern_exit.c:220 single_thread_check_locked(ffff800021298be8,0,0) at single_thread_check_locked+0x237 sys/kern/kern_sig.c:2015 userret(ffff800021298be8) at userret+0x7c single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff800021298be8) at userret+0x7c sys/kern/kern_sig.c:1970 syscall(ffff800026149b60) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800026149b60) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70346fa733e0, count: -9