panic: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pipex.c", line 459 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 114511 31753 0 0x2 0x1 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83450f17) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348b8e2,ffffffff834a3acd,1cb,ffffffff83442dc4) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003a3d9748) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff8000015f4800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff8000015f4800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,1,2000,ffff800032fbbca8) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000353c9ff0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80699d97c8,1,fffffd80097fd618,ffff800032fbbca8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b635a48,ffff800032fbbca8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b635a48,ffff800032fbbca8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b635a48,ffff800032fbbca8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806b635a48,ffff800032fbbca8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800032fbbca8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800032fbbca8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800032fbbca8,ffff8000353ca360,ffff8000353ca2b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff8000353ca350, count: 0 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pipex.c", line 459 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83450f17) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348b8e2,ffffffff834a3acd,1cb,ffffffff83442dc4) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003a3d9748) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff8000015f4800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff8000015f4800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,1,2000,ffff800032fbbca8) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000353c9ff0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80699d97c8,1,fffffd80097fd618,ffff800032fbbca8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b635a48,ffff800032fbbca8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b635a48,ffff800032fbbca8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b635a48,ffff800032fbbca8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806b635a48,ffff800032fbbca8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800032fbbca8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800032fbbca8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800032fbbca8,ffff8000353ca360,ffff8000353ca2b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000353ca360) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353ca360) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7aad2bc0ed10, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000353c9dc0 rbx 0xffffffff838bae07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff800032fbbca8 rax 0xffffffff838b9ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xe37c1fbf7ef61dca r11 0x1df11144f5eb01b3 r12 0xffffffff838bac08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82d5efc5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000353c9db0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=61476 pid=7386 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800032fbbca8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800032fba550,0xffff800032fba7f8 process=0xffff8000fffef508 user=0xffff8000353c5000, vmspace=0xfffffd806c876200 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 4785 328253 73310 0 2 0 syz-executor 4785 321002 73310 0 3 0x4000080 fsleep syz-executor 4785 494843 73310 0 3 0x4000080 fsleep syz-executor 4785 258801 73310 0 2 0x4000000 syz-executor 98879 279521 53518 0 2 0 syz-executor 98879 206107 53518 0 3 0x4000080 fsleep syz-executor 12815 218513 70037 0 2 0 syz-executor 12815 199820 70037 0 2 0x4000000 syz-executor 97810 196915 96039 0 2 0 syz-executor 97810 324794 96039 0 3 0x4000080 rest syz-executor 80045 228697 0 0 3 0x14200 acct acct 20641 240885 20619 0 3 0x80 nanoslp syz-executor 20641 89412 20619 0 3 0x4000080 ttyout syz-executor 20641 105630 20619 0 3 0x4000080 ttyout syz-executor 20641 439271 20619 0 3 0x4000080 ttyin syz-executor 20641 406769 20619 0 3 0x4000080 fsleep syz-executor 53518 507524 32564 0 3 0x82 nanoslp syz-executor 20619 120523 32564 0 2 0x2 syz-executor 10056 455413 32564 0 2 0x2 syz-executor 96039 426766 32564 0 3 0x82 nanoslp syz-executor 78272 244705 32564 0 3 0x82 nanoslp syz-executor 70037 146072 32564 0 3 0x82 nanoslp syz-executor 31753 114511 32564 0 7 0x3 syz-executor 73310 206314 32564 0 3 0x82 nanoslp syz-executor 32564 443300 80196 0 2 0x2 syz-executor 80196 397041 31578 0 3 0x10008a sigsusp ksh 31578 428754 83179 0 3 0x98 kqread sshd-session 83179 45238 77879 0 3 0x92 kqread sshd-session 51467 101698 1 0 3 0x100083 ttyin getty 77879 103127 1 0 3 0x88 kqread sshd 60773 169886 73499 74 3 0x1100092 bpf pflogd 73499 426711 1 0 3 0x80 sbwait pflogd 65757 334326 60509 73 3 0x1100090 kqread syslogd 60509 255668 1 0 3 0x100082 sbwait syslogd 15020 53352 1 0 3 0x100080 kqread resolvd 67640 138568 1511 77 3 0x100092 kqread dhcpleased 7604 380984 1511 77 3 0x100092 kqread dhcpleased 1511 179769 1 0 3 0x80 kqread dhcpleased 78470 125727 0 0 3 0x14200 bored smr 42623 167139 0 0 2 0x14200 zerothread 65169 342851 0 0 3 0x14200 aiodoned aiodoned 75101 237704 0 0 3 0x14200 syncer update 89989 283320 0 0 3 0x14200 cleaner cleaner 46598 174375 0 0 3 0x14200 reaper reaper 6104 353906 0 0 3 0x14200 pgdaemon pagedaemon 57853 122765 0 0 3 0x14200 bored viomb 18559 40116 0 0 3 0x40014200 acpi0 acpi0 9555 299189 0 0 3 0x40014200 idle1 33899 512620 0 0 3 0x14200 bored softnet1 8051 377200 0 0 2 0x14200 softnet0 2261 65078 0 0 3 0x14200 bored systqmp 91010 297412 0 0 3 0x14200 bored systq 27528 363462 0 0 3 0x14200 tmoslp softclockmp 52645 412263 0 0 3 0x40014200 tmoslp softclock 77156 39322 0 0 3 0x40014200 idle0 1 476538 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/net/pipex.c:78 r = 0 (0xffffffff838d9180) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 pipex_destroy_all_sessions+0x2f sys/net/pipex.c:144 #3 pppacclose+0x16f sys/net/if_pppx.c:1335 #4 spec_close+0x417 sys/kern/spec_vnops.c:-1 #5 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #6 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #6 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #7 fdrop+0x121 sys/kern/kern_descrip.c:1281 #8 closef+0x192 sys/kern/kern_descrip.c:1265 #9 fdfree+0x116 sys/kern/kern_descrip.c:1196 #10 exit1+0x576 sys/kern/kern_exit.c:215 #11 sys_exit+0x1a sys/kern/kern_exit.c:-1 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 8051 (softnet0) thread 0xffff8000ffffe000 (377200) shared rwlock softnet0 r = 0 (0xffff80000002c078) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11062 12152K 12372K 166960K 12216 0 pcb 18 12K 12K 166960K 24 0 rtable 241 7K 7K 166960K 355 0 pf 35 17K 18K 166960K 52 0 ifaddr 43 7K 7K 166960K 47 0 ifgroup 55 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 5 0 counters 72 37K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 1497 0 iov 0 0K 12K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1302 82K 82K 166960K 1398 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 180 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 180K 166960K 557 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 1 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 385 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 229 159K 168K 166960K 3411 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 41 82K 102K 166960K 1317 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 22 1K 2K 166960K 30 0 temp 36 9070K 9134K 166960K 6900 0 kqueue 13 20K 24K 166960K 30 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 35 0 32 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 51 0 32 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 20 0 14 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 99 0 89 2 0 2 2 0 8 1 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 5 0 4 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 3 0 2 1 0 1 1 0 482 0 pffrnode 88 3 0 2 1 0 1 1 0 8 0 pffrent 40 6 0 5 1 0 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 18 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 2 1 0 1 1 0 8 0 pfstate 448 20 0 2 3 0 3 3 0 8 1 pfrule 1360 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 256 453 0 0 29 0 29 29 0 8 0 art_table 40 454 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 semapl 112 4 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1652 0 181 93 0 93 93 0 8 0 ffsino 296 1652 0 181 114 0 114 114 0 8 0 nchpl 144 1911 0 209 64 0 64 64 0 8 0 rtmask 32 1 0 0 1 0 1 1 0 8 0 vnodes 216 1765 0 0 99 0 99 99 0 8 0 namei 1024 5775 0 5775 1 0 1 1 0 8 1 percpumem 16 55 0 4 1 0 1 1 0 8 0 kstatmem 264 30 0 4 2 0 2 2 0 8 0 scxspl 216 6531 0 6531 4 1 3 3 1 8 3 plimitpl 152 34 0 16 1 0 1 1 0 8 0 sigapl 424 493 0 446 7 0 7 7 0 8 1 knotepl 120 90 0 0 3 0 3 3 0 8 0 kqueuepl 224 33 0 23 1 0 1 1 0 8 0 pipepl 344 123 0 96 3 0 3 3 0 8 0 fdescpl 528 476 0 446 3 0 3 3 0 8 0 filepl 160 1755 0 1533 10 0 10 10 0 8 0 lockfpl 104 20 0 18 1 0 1 1 0 8 0 lockfspl 48 11 0 9 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 13 1 0 1 1 0 8 0 ucredpl 104 127 0 114 1 0 1 1 0 8 0 zombiepl 144 447 0 446 1 0 1 1 0 8 0 processpl 1232 493 0 446 5 0 5 5 0 8 1 procpl 664 580 0 523 6 0 6 6 0 8 0 sockpl 752 188 0 156 4 0 4 4 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 13 0 0 2 0 2 2 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 117 0 0 8 0 8 8 0 8 0 bufpl 280 2500 0 105 172 0 172 172 0 8 0 anonpl 32 5510 0 0 45 0 45 45 0 246 0 amapchunkpl 152 9909 0 9437 26 0 26 26 0 158 5 amappl16 200 2206 0 2185 5 0 5 5 0 8 2 amappl15 192 10 0 10 1 0 1 1 0 8 1 amappl14 184 450 0 448 1 0 1 1 0 8 0 amappl13 176 120 0 107 1 0 1 1 0 8 0 amappl12 168 725 0 696 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 0 1 1 0 8 1 amappl10 152 62 0 48 1 0 1 1 0 8 0 amappl9 144 271 0 270 1 0 1 1 0 8 0 amappl8 136 110 0 108 1 0 1 1 0 8 0 amappl7 128 145 0 132 1 0 1 1 0 8 0 amappl6 120 156 0 155 1 0 1 1 0 8 0 amappl5 112 91 0 81 1 0 1 1 0 8 0 amappl4 104 281 0 260 1 0 1 1 0 8 0 amappl3 96 1734 0 1624 4 0 4 4 0 8 0 amappl2 88 514 0 455 2 0 2 2 0 8 0 amappl1 80 9526 0 8920 14 0 14 14 0 8 0 amappl 88 2700 0 2542 5 0 5 5 0 92 0 uvmvnodes 80 99 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 476 0 446 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 476 0 446 1 0 1 1 0 8 0 vmmpekpl 168 5679 0 5646 2 0 2 2 0 8 0 vmmpepl 168 38850 0 36986 87 0 87 87 0 357 0 vmsppl 488 475 0 446 5 0 5 5 0 8 1 rwobjpl 80 14425 0 13397 23 0 23 23 0 8 0 pdppl 4096 959 0 892 97 16 81 85 0 8 14 pvpl 32 12848 0 0 104 0 104 104 0 265 0 pmappl 256 475 0 446 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 264 0 19 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83450f17) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348b8e2,ffffffff834a3acd,1cb,ffffffff83442dc4) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003a3d9748) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff8000015f4800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff8000015f4800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,1,2000,ffff800032fbbca8) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000353c9ff0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80699d97c8,1,fffffd80097fd618,ffff800032fbbca8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b635a48,ffff800032fbbca8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b635a48,ffff800032fbbca8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b635a48,ffff800032fbbca8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806b635a48,ffff800032fbbca8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800032fbbca8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800032fbbca8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800032fbbca8,ffff8000353ca360,ffff8000353ca2b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000353ca360) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353ca360) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7aad2bc0ed10, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299bdff0) 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(ffffffff83a41100) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a41100) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrsysret(ffff8000ffffcd00,35,0,ffff80002a2ec280) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000ffffcd00,35,0,ffff80002a2ec280) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a2ec330) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a2ec330) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c6595356870, count: 8 ddb{1}> trace x86_ipi_db(ffff8000299bdff0) 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(ffffffff83a41100) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a41100) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrsysret(ffff8000ffffcd00,35,0,ffff80002a2ec280) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000ffffcd00,35,0,ffff80002a2ec280) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a2ec330) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a2ec330) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c6595356870, count: -7