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 189634 49683 0 0 0 0 syz-executor *294689 61652 0 0 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b04a1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f01df,ffffffff83405e4b,1cb,ffffffff833a39c2) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c419bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff80002a262010) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c4332a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805cca6da0,81,fffffd80097fd750,ffff80002a262010) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806d1c1730,ffff80002a262010) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806d1c1730,ffff80002a262010) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff80003c433500) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433500) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf035485ea10, count: 2 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 "rn != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pipex.c", line 459 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b04a1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f01df,ffffffff83405e4b,1cb,ffffffff833a39c2) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c419bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff80002a262010) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c4332a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805cca6da0,81,fffffd80097fd750,ffff80002a262010) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806d1c1730,ffff80002a262010) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806d1c1730,ffff80002a262010) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff80003c433500) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433500) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf035485ea10, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c433070 rbx 0xffff8000299dee07 rdx 0xffff800001480bc0 rcx 0xffff80002a262010 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x334a25573c1de7d1 r11 0xa59e0643d0094d7e r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff825106e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c433060 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=294689 pid=61652 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=81, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003a7fea88,0xffff80003a7f8030 process=0xffff80003a7ed830 user=0xffff80003c42e000, vmspace=0xfffffd806cb143e8 estcpu=31, cpticks=2, pctcpu=0.1, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49683 189634 32166 0 7 0 syz-executor 49683 120558 32166 0 3 0x4000080 kqsel syz-executor 37681 311938 27415 0 2 0 syz-executor 37681 170895 27415 0 3 0x4000080 fsleep syz-executor 91655 416051 18746 0 2 0 syz-executor 91655 197923 18746 0 3 0x4000080 fsleep syz-executor 81319 510972 43375 0 2 0 syz-executor 81319 238318 43375 0 3 0x4000080 fsleep syz-executor 57887 272932 16934 60929 2 0x10 syz-executor 57887 202817 16934 60929 3 0x4000090 msgwait syz-executor 57887 522369 16934 60929 3 0x4000090 fsleep syz-executor 61652 107713 13085 0 2 0 syz-executor *61652 294689 13085 0 7 0x4000000 syz-executor 99449 68761 8727 0 2 0 syz-executor 99449 315971 8727 0 3 0x4000080 fsleep syz-executor 99449 178656 8727 0 3 0x4000080 fsleep syz-executor 18746 434251 95726 0 3 0x82 nanoslp syz-executor 22413 366189 0 0 3 0x14200 acct acct 32166 160790 95726 0 3 0x82 nanoslp syz-executor 13085 425141 95726 0 3 0x82 nanoslp syz-executor 8727 400283 95726 0 3 0x82 nanoslp syz-executor 27415 435586 95726 0 3 0x82 nanoslp syz-executor 43375 257419 95726 0 3 0x82 nanoslp syz-executor 23340 59533 95726 0 2 0x2 syz-executor 16934 323954 95726 0 3 0x82 nanoslp syz-executor 95726 261594 9614 0 3 0x82 kqread syz-executor 9614 80944 77023 0 3 0x10008a sigsusp ksh 77023 289515 21690 0 3 0x98 kqread sshd-session 21690 418763 17720 0 3 0x92 kqread sshd-session 58265 226880 1 0 3 0x100083 ttyin getty 17720 449163 1 0 3 0x88 kqread sshd 95399 172766 89829 74 3 0x1100092 bpf pflogd 89829 46054 1 0 3 0x80 sbwait pflogd 15047 43215 82273 73 3 0x1100090 kqread syslogd 82273 36105 1 0 3 0x100082 sbwait syslogd 10145 388620 1 0 3 0x100080 kqread resolvd 36843 124963 34210 77 3 0x100092 kqread dhcpleased 20149 518340 34210 77 3 0x100092 kqread dhcpleased 34210 314604 1 0 3 0x80 kqread dhcpleased 53290 261279 0 0 3 0x14200 bored smr 17827 148820 0 0 2 0x14200 zerothread 33190 290382 0 0 3 0x14200 aiodoned aiodoned 8809 498627 0 0 3 0x14200 syncer update 29068 381332 0 0 3 0x14200 cleaner cleaner 87177 160783 0 0 3 0x14200 reaper reaper 41930 180528 0 0 3 0x14200 pgdaemon pagedaemon 63638 493925 0 0 3 0x14200 bored viomb 75347 226077 0 0 3 0x40014200 acpi0 acpi0 26755 377306 0 0 3 0x40014200 idle1 60143 513085 0 0 3 0x14200 bored softnet1 62781 352421 0 0 2 0x14200 softnet0 86938 167191 0 0 3 0x14200 bored systqmp 11014 15638 0 0 3 0x14200 bored systq 49394 365933 0 0 3 0x14200 tmoslp softclockmp 22560 138243 0 0 3 0x40014200 tmoslp softclock 78353 145471 0 0 3 0x40014200 idle0 1 317629 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex /syzkaller/managers/multicore/kernel/sys/net/pipex.c:78 r = 0 (0xffffffff837d3d40) #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:1280 #8 closef+0x192 sys/kern/kern_descrip.c:1264 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 Process 61652 (syz-executor) thread 0xffff80002a262010 (294689) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839b1cc8) #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 msleep_nsec+0x132 sys/kern/kern_synch.c:219 #4 taskq_do_barrier+0x15f sys/kern/kern_task.c:304 #5 ifiq_destroy+0xda sys/net/ifq.c:697 #6 if_detach+0x7a6 sys/net/if.c:-1 #7 pppacclose+0x118 sys/net/if_pppx.c:1329 #8 spec_close+0x417 sys/kern/spec_vnops.c:-1 #9 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #10 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #10 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #11 fdrop+0x121 sys/kern/kern_descrip.c:1280 #12 closef+0x192 sys/kern/kern_descrip.c:1264 #13 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive mutex /syzkaller/managers/multicore/kernel/sys/net/pipex.c:78 r = 0 (0xffffffff837d3d40) #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:1280 #8 closef+0x192 sys/kern/kern_descrip.c:1264 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 Process 62781 (softnet0) thread 0xffff8000ffffe000 (352421) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10190 11019K 11345K 166960K 11593 0 pcb 18 12K 12K 166960K 46 0 rtable 203 7K 7K 166960K 429 0 pf 31 17K 24K 166960K 89 0 ifaddr 35 6K 7K 166960K 65 0 ifgroup 47 2K 2K 166960K 83 0 sysctl 3 1K 9K 166960K 7 0 counters 68 36K 37K 166960K 106 0 ioctlops 0 0K 4K 166960K 1594 0 iov 0 0K 12K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1406 88K 89K 166960K 1626 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 9 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 106K 166960K 364 0 sigio 0 0K 0K 166960K 3 0 proc 72 115K 164K 166960K 604 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 57 0 in_multi 77 5K 6K 166960K 128 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 414 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 251 167K 177K 166960K 4976 0 UVM aobj 5 2K 2K 166960K 6 0 pinsyscall 43 86K 100K 166960K 1533 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 19 0 NDP 10 0K 1K 166960K 44 0 temp 42 8671K 8736K 166960K 17194 0 kqueue 15 24K 26K 166960K 55 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 54 0 49 1 0 1 1 0 8 0 rtentry 176 134 0 45 5 0 5 5 0 8 0 unpcb 144 115 0 95 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 62 0 56 1 0 1 1 0 8 0 arp 136 22 0 8 1 0 1 1 0 8 0 inpcb 328 226 0 215 2 0 2 2 0 8 0 nd6 152 31 0 12 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1192 16 0 15 1 0 1 1 0 8 0 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 2 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 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 25 0 0 1 0 1 1 0 8 0 pfstkey 128 25 0 0 1 0 1 1 0 8 0 pfstate 448 25 0 0 3 0 3 3 0 8 0 pfrule 1344 26 0 20 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 545 0 176 26 0 26 26 0 8 1 art_table 40 546 0 176 5 0 5 5 0 8 0 art_node 32 134 0 53 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 5 0 2 1 0 1 1 0 8 0 shmpl 112 3 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1987 0 471 96 0 96 96 0 8 0 ffsino 296 1987 0 471 118 0 118 118 0 8 0 nchpl 144 2450 0 743 64 0 64 64 0 8 0 rtmask 32 4 0 3 1 0 1 1 0 8 0 vnodes 216 2243 0 0 125 0 125 125 0 8 0 namei 1024 7958 0 7958 2 1 1 2 0 8 1 percpumem 16 68 0 19 1 0 1 1 0 8 0 kstatmem 264 50 0 28 3 0 3 3 0 8 1 scxspl 216 11460 0 11460 9 2 7 8 1 8 7 plimitpl 152 92 0 74 1 0 1 1 0 8 0 sigapl 424 662 0 613 6 0 6 6 0 8 0 knotepl 120 288 0 0 9 0 9 9 0 8 0 kqueuepl 224 107 0 94 3 0 3 3 0 8 2 pipepl 344 145 0 117 3 0 3 3 0 8 0 fdescpl 528 645 0 613 3 0 3 3 0 8 0 filepl 160 2925 0 2697 13 0 13 13 0 8 2 lockfpl 104 144 0 141 1 0 1 1 0 8 0 lockfspl 48 39 0 36 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 283 0 269 1 0 1 1 0 8 0 zombiepl 144 614 0 613 1 0 1 1 0 8 0 processpl 1232 662 0 613 5 0 5 5 0 8 0 procpl 664 992 0 934 6 0 6 6 0 8 0 sockpl 752 405 0 369 4 0 4 4 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 182 0 0 12 0 12 12 0 8 0 bufpl 280 4227 0 130 293 0 293 293 0 8 0 anonpl 32 10967 0 0 89 0 89 89 0 246 0 amapchunkpl 152 15054 0 14542 28 0 28 28 0 158 6 amappl16 200 2675 0 2627 30 14 16 25 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 476 0 475 1 0 1 1 0 8 0 amappl12 168 1013 0 970 3 0 3 3 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 49 0 34 1 0 1 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 30 0 27 1 0 1 1 0 8 0 amappl7 128 97 0 96 1 0 1 1 0 8 0 amappl6 120 299 0 286 1 0 1 1 0 8 0 amappl5 112 75 0 65 1 0 1 1 0 8 0 amappl4 104 423 0 393 1 0 1 1 0 8 0 amappl3 96 2709 0 2597 4 0 4 4 0 8 0 amappl2 88 547 0 487 2 0 2 2 0 8 0 amappl1 80 10027 0 9434 14 1 13 14 0 8 0 amappl 88 4189 0 4018 5 0 5 5 0 92 0 uvmvnodes 80 106 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 1 1 0 1 1 0 8 0 uaddrrnd 24 645 0 613 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 645 0 613 1 0 1 1 0 8 0 vmmpekpl 168 6892 0 6848 3 0 3 3 0 8 0 vmmpepl 168 48464 0 46485 106 0 106 106 0 357 13 vmsppl 488 644 0 613 5 0 5 5 0 8 0 rwobjpl 80 16612 0 15558 31 0 31 31 0 8 4 pdppl 4096 1298 0 1226 98 26 72 80 0 8 0 pvpl 32 21102 0 0 171 0 171 171 0 265 0 pmappl 256 644 0 613 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 273 0 30 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837d0ff0) 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(ffffffff839b1ac0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839b1ac0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x71795478da40, count: 8 ddb{0}> trace x86_ipi_db(ffffffff837d0ff0) 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(ffffffff839b1ac0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839b1ac0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x71795478da40, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b04a1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f01df,ffffffff83405e4b,1cb,ffffffff833a39c2) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c419bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff80002a262010) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c4332a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805cca6da0,81,fffffd80097fd750,ffff80002a262010) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806d1c1730,ffff80002a262010) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806d1c1730,ffff80002a262010) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff80003c433500) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433500) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf035485ea10, count: 2 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b04a1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f01df,ffffffff83405e4b,1cb,ffffffff833a39c2) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c419bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001475800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff80002a262010) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c4332a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805cca6da0,81,fffffd80097fd750,ffff80002a262010) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d1c1730,ffff80002a262010) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806d1c1730,ffff80002a262010) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806d1c1730,ffff80002a262010) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff80003c433500) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433500) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf035485ea10, count: -13