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 196747 37618 77 0x100012 0x1 1 dhcpleased db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83394ffb) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d3acc,ffffffff833edc88,1cb,ffffffff8338bd7d) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80002ffd5748) at pipex_unlink_session_locked+0x409 pipex_destroy_all_sessions(ffff800001469800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001469800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,41,2000,ffff80002ffd8d20) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c409700) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ca287a8,41,fffffd80097fb548,ffff80002ffd8d20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8063fc4a90,ffff80002ffd8d20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8063fc4a90,ffff80002ffd8d20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8063fc4a90,ffff80002ffd8d20) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8063fc4a90,ffff80002ffd8d20) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002ffd8d20) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002ffd8d20,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002ffd8d20,ffff80003c409a70,ffff80003c4099c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c409a60, 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(ffffffff83394ffb) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d3acc,ffffffff833edc88,1cb,ffffffff8338bd7d) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80002ffd5748) at pipex_unlink_session_locked+0x409 pipex_destroy_all_sessions(ffff800001469800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001469800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,41,2000,ffff80002ffd8d20) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c409700) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ca287a8,41,fffffd80097fb548,ffff80002ffd8d20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8063fc4a90,ffff80002ffd8d20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8063fc4a90,ffff80002ffd8d20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8063fc4a90,ffff80002ffd8d20) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8063fc4a90,ffff80002ffd8d20) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002ffd8d20) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002ffd8d20,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002ffd8d20,ffff80003c409a70,ffff80003c4099c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c409a70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c409a70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x736ec5235620, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4094d0 rbx 0xffffffff8388dddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff80002ffd8d20 rax 0xffffffff8388cff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x86d7879200c9aac6 r11 0x2c4ad8e6a795f637 r12 0xffffffff8388dbe0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff8271a0c5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4094c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=183111 pid=2802 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002ffd8d20 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002ffd8a88,0xffff80002a2734e0 process=0xffff80002a3d2698 user=0xffff80003c404000, vmspace=0xfffffd806c1bb9b0 estcpu=36, cpticks=6, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45609 211572 68581 0 3 0x80 fsleep syz-executor 45609 454008 68581 0 3 0x4000080 pipewr syz-executor 52538 224888 79792 0 3 0x80 fsleep syz-executor 52538 125603 79792 0 3 0x4000080 kqsel syz-executor 2104 314484 65982 0 3 0x80 fsleep syz-executor 2104 481143 65982 0 3 0x4000080 piperd syz-executor 92103 407561 90085 0 3 0x80 fsleep syz-executor 92103 237329 90085 0 3 0x4000080 rest syz-executor 30069 19365 42006 0 3 0x80 fsleep syz-executor 30069 281483 42006 0 3 0x4000080 ttyout syz-executor 80456 41623 78860 0 3 0x80 fsleep syz-executor 80456 345119 78860 0 3 0x4000080 sbwait syz-executor 78696 307241 0 0 3 0x14200 acct acct 40543 194933 1 0 3 0x100083 ttyopn getty 42006 197859 24616 0 3 0x82 nanoslp syz-executor 30105 491203 24616 0 3 0x82 nanoslp syz-executor 65982 511506 24616 0 3 0x82 nanoslp syz-executor 68581 317868 24616 0 3 0x82 nanoslp syz-executor 90085 230610 24616 0 3 0x82 nanoslp syz-executor 78860 406544 24616 0 3 0x82 nanoslp syz-executor 6115 95789 24616 0 3 0x2 biowait syz-executor 79792 284388 24616 0 3 0x82 nanoslp syz-executor 24616 187375 9551 0 3 0x82 kqread syz-executor 9551 451658 53162 0 3 0x10008a sigsusp ksh 53162 406456 85910 0 3 0x98 kqread sshd-session 85910 71690 36469 0 3 0x92 kqread sshd-session 36469 100277 1 0 3 0x88 kqread sshd 60558 37384 79537 74 3 0x1100092 bpf pflogd 79537 380597 1 0 3 0x80 sbwait pflogd 25754 380903 40729 73 3 0x1100090 kqread syslogd 40729 216828 1 0 3 0x100082 sbwait syslogd 97696 249703 1 0 2 0x100000 resolvd 37618 196747 29732 77 7 0x100013 dhcpleased 32061 65902 29732 77 3 0x100092 kqread dhcpleased 29732 177080 1 0 3 0x80 kqread dhcpleased 83113 274852 0 0 3 0x14200 bored smr 22553 267830 0 0 3 0x14200 pgzero zerothread 70937 25895 0 0 3 0x14200 aiodoned aiodoned 48584 54525 0 0 3 0x14200 syncer update 87098 218913 0 0 3 0x14200 cleaner cleaner 42245 65683 0 0 3 0x14200 reaper reaper 91708 69541 0 0 3 0x14200 pgdaemon pagedaemon 62948 257029 0 0 3 0x14200 bored viomb 19913 470173 0 0 3 0x40014200 acpi0 acpi0 1153 378709 0 0 3 0x40014200 idle1 27422 496016 0 0 3 0x14200 bored softnet1 45002 62928 0 0 2 0x14200 softnet0 25618 364844 0 0 3 0x14200 bored systqmp 65277 68893 0 0 3 0x14200 bored systq 7519 126628 0 0 3 0x14200 tmoslp softclockmp 72617 286222 0 0 3 0x40014200 tmoslp softclock 44451 434974 0 0 3 0x40014200 idle0 1 185266 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 (0xffffffff8383c240) #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_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pipex_destroy_all_sessions+0x2f sys/net/pipex.c:144 #4 pppacclose+0x16f sys/net/if_pppx.c:1335 #5 spec_close+0x417 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #14 Xsyscall+0x128 Process 6115 (syz-executor) thread 0xffff8000fffeea78 (95789) exclusive rrwlock inode r = 0 (0xfffffd806bef3a28) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c6e3698) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 Process 45002 (softnet0) thread 0xffff8000ffffecf8 (62928) 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 10205 11039K 11328K 166960K 11779 0 pcb 17 13K 14K 166960K 126 0 rtable 233 10K 10K 166960K 496 0 pf 36 18K 19K 166960K 117 0 ifaddr 39 6K 7K 166960K 80 0 ifgroup 55 2K 2K 166960K 131 0 sysctl 4 1K 9K 166960K 12 0 counters 70 37K 38K 166960K 152 0 ioctlops 0 0K 4K 166960K 1583 0 iov 0 0K 16K 166960K 231 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 85K 166960K 1965 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 12 0K 0K 166960K 24 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 85K 166960K 671 0 sigio 0 0K 0K 166960K 8 0 proc 72 115K 180K 166960K 595 0 subproc 72 4K 4K 166960K 73 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 75 0 in_multi 83 6K 7K 166960K 143 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 421 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 250 178K 191K 166960K 8010 0 UVM aobj 23 2K 2K 166960K 25 0 pinsyscall 42 84K 104K 166960K 1817 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 44 0 NDP 12 0K 2K 166960K 56 0 temp 50 8653K 8721K 166960K 38490 0 kqueue 13 20K 29K 166960K 135 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 66 0 62 1 0 1 1 0 8 0 rtentry 176 127 0 31 6 0 6 6 0 8 0 unpcb 144 427 0 408 6 2 4 4 0 8 3 syncache 336 6 0 6 3 2 1 1 0 8 1 tcpcb 736 149 0 143 1 0 1 1 0 8 0 arp 136 19 0 5 1 0 1 1 0 8 0 inpcb 328 548 0 539 6 2 4 4 0 8 3 nd6 152 27 0 6 1 0 1 1 0 8 0 pkpcb 40 6 0 6 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 34 0 33 1 0 1 1 0 8 0 pppxif 1504 2 0 2 1 0 1 1 0 8 1 pffrag 232 9 0 2 1 0 1 1 0 482 0 pffrnode 88 8 0 1 1 0 1 1 0 8 0 pffrent 40 11 0 4 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfstitem 24 62 0 23 1 0 1 1 0 8 0 pfstkey 128 64 0 25 2 0 2 2 0 8 0 pfstate 384 64 0 25 5 0 5 5 0 8 0 pfrule 1344 26 0 21 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 515 0 102 29 0 29 29 0 8 0 art_table 40 518 0 102 5 0 5 5 0 8 0 art_node 32 127 0 41 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 4 1 0 1 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 22 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2869 0 1366 96 0 96 96 0 8 0 ffsino 296 2869 0 1366 118 0 118 118 0 8 0 nchpl 144 3843 0 2143 64 0 64 64 0 8 0 rtmask 32 7 0 6 1 0 1 1 0 8 0 vnodes 216 3123 0 0 174 0 174 174 0 8 0 namei 1024 13029 0 13028 2 1 1 2 0 8 0 percpumem 16 91 0 41 1 0 1 1 0 8 0 kstatmem 264 80 0 52 3 0 3 3 0 8 1 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 20469 0 20467 9 8 1 8 1 8 0 plimitpl 152 301 0 283 1 0 1 1 0 8 0 sigapl 424 985 0 937 6 0 6 6 0 8 0 knotepl 120 534 0 0 17 0 17 17 0 8 0 kqueuepl 224 355 0 345 6 4 2 5 0 8 1 pipepl 344 170 0 141 3 0 3 3 0 8 0 fdescpl 528 968 0 937 3 0 3 3 0 8 0 filepl 160 6315 0 6091 23 7 16 17 0 8 5 lockfpl 104 196 0 194 1 0 1 1 0 8 0 lockfspl 48 84 0 82 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 42 0 25 1 0 1 1 0 8 0 ucredpl 104 1242 0 1229 1 0 1 1 0 8 0 zombiepl 144 938 0 937 1 0 1 1 0 8 0 processpl 1232 985 0 937 5 1 4 5 0 8 0 procpl 664 1899 0 1845 6 0 6 6 0 8 1 sosppl 176 5 0 5 2 1 1 1 0 8 1 sockpl 752 1052 0 1020 17 6 11 11 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 149 0 0 10 0 10 10 0 8 0 bufpl 280 8044 0 1907 439 0 439 439 0 8 0 anonpl 32 12629 0 0 102 0 102 102 0 246 0 amapchunkpl 152 31846 0 31286 42 3 39 39 0 158 15 amappl16 200 4172 0 3906 29 2 27 27 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 10 0 10 1 1 0 1 0 8 0 amappl13 176 425 0 423 1 0 1 1 0 8 0 amappl12 168 1359 0 1317 3 0 3 3 0 8 0 amappl11 160 7 0 7 2 1 1 1 0 8 1 amappl10 152 67 0 53 1 0 1 1 0 8 0 amappl9 144 357 0 357 1 1 0 1 0 8 0 amappl8 136 29 0 26 1 0 1 1 0 8 0 amappl7 128 85 0 84 1 0 1 1 0 8 0 amappl6 120 275 0 261 1 0 1 1 0 8 0 amappl5 112 84 0 73 1 0 1 1 0 8 0 amappl4 104 431 0 400 1 0 1 1 0 8 0 amappl3 96 4528 0 4439 3 0 3 3 0 8 0 amappl2 88 1105 0 1028 2 0 2 2 0 8 0 amappl1 80 12010 0 11423 15 1 14 15 0 8 0 amappl 88 7174 0 7006 5 0 5 5 0 92 0 uvmvnodes 80 3123 0 0 64 0 64 64 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 128 254 0 254 2 2 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 10 0 10 2 2 0 1 0 8 0 dma16 16 23 0 22 1 0 1 1 0 8 0 aobjpl 72 24 0 2 1 0 1 1 0 8 0 uaddrrnd 24 968 0 937 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 968 0 937 1 0 1 1 0 8 0 vmmpekpl 168 9527 0 9491 2 0 2 2 0 8 0 vmmpepl 168 69795 0 67638 107 0 107 107 0 357 1 vmsppl 488 967 0 937 6 1 5 5 0 8 0 rwobjpl 80 25227 0 20922 89 0 89 89 0 8 0 pdppl 4096 1944 0 1874 100 28 72 82 0 8 2 pvpl 32 20001 0 0 161 0 161 161 0 265 0 pmappl 256 967 0 937 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 275 0 33 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(ffffffff83394ffb) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d3acc,ffffffff833edc88,1cb,ffffffff8338bd7d) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80002ffd5748) at pipex_unlink_session_locked+0x409 pipex_destroy_all_sessions(ffff800001469800) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001469800) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,41,2000,ffff80002ffd8d20) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c409700) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ca287a8,41,fffffd80097fb548,ffff80002ffd8d20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8063fc4a90,ffff80002ffd8d20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8063fc4a90,ffff80002ffd8d20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8063fc4a90,ffff80002ffd8d20) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8063fc4a90,ffff80002ffd8d20) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002ffd8d20) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002ffd8d20,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002ffd8d20,ffff80003c409a70,ffff80003c4099c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c409a70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c409a70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x736ec5235620, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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(ffffffff8389d858) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d858) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrstruct(ffff80002a2727d8,ffffffff833c01b0,ffff80002a2a9ce0,60) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_kevent(ffff80002a2727d8,ffff80002a2aa060,ffff80002a2a9fb0) at sys_kevent+0x34a sys/kern/kern_event.c:1280 syscall(ffff80002a2aa060) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2aa060) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78d7de6c4840, count: 7 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff8389d858) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d858) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrstruct(ffff80002a2727d8,ffffffff833c01b0,ffff80002a2a9ce0,60) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_kevent(ffff80002a2727d8,ffff80002a2aa060,ffff80002a2a9fb0) at sys_kevent+0x34a sys/kern/kern_event.c:1280 syscall(ffff80002a2aa060) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2aa060) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78d7de6c4840, count: -8