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 107763 71785 0 0 0 0 syz-executor * 53810 83798 0 0 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5bf3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f0cea,ffffffff8340af2f,1cb,ffffffff833a8449) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c401bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff8000fffee548) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000317c23e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c782d88,81,fffffd80097fd478,ffff8000fffee548) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8062c26188,ffff8000fffee548) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8062c26188,ffff8000fffee548) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff8000317c2640) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000317c2640) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721c40a1540, 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(ffffffff833b5bf3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f0cea,ffffffff8340af2f,1cb,ffffffff833a8449) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c401bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff8000fffee548) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000317c23e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c782d88,81,fffffd80097fd478,ffff8000fffee548) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8062c26188,ffff8000fffee548) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8062c26188,ffff8000fffee548) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff8000317c2640) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000317c2640) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721c40a1540, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000317c21b0 rbx 0xffff8000299dee07 rdx 0xffff8000015679c0 rcx 0xffff8000fffee548 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x15b5494e8f46cd15 r11 0x8fb12ade444676fb r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff82ebfd25 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000317c21a0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=53810 pid=83798 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=57, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffee7e0,0xffff8000fffef250 process=0xffff80003c40c4f0 user=0xffff8000317bd000, vmspace=0xfffffd806c188208 estcpu=7, cpticks=2, pctcpu=0.1, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38937 303051 52348 0 2 0 syz-executor 38937 495781 52348 0 3 0x4000080 fsleep syz-executor 38937 500368 52348 0 2 0x4000000 syz-executor 52281 236398 55496 0 2 0 syz-executor 52281 3226 55496 0 3 0x4000080 fsleep syz-executor 71785 107763 57746 0 7 0 syz-executor 71785 11441 57746 0 2 0x4000000 syz-executor 71785 37718 57746 0 2 0x4000080 syz-executor 68818 171381 84287 0 2 0 syz-executor 68818 437456 84287 0 3 0x4000080 fsleep syz-executor 1276 181314 2660 0 2 0 syz-executor 28591 30975 33428 0 2 0 syz-executor 28591 400543 33428 0 3 0x4000080 fsleep syz-executor 28591 116421 33428 0 3 0x4000080 fsleep syz-executor 83798 95216 31772 0 3 0x80 nanoslp syz-executor *83798 53810 31772 0 7 0x4000000 syz-executor 52744 497131 65722 0 3 0x80 nanoslp syz-executor 52744 264786 65722 0 3 0x4000080 fifow syz-executor 52744 289303 65722 0 3 0x4000080 fsleep syz-executor 31772 289933 96950 0 3 0x82 nanoslp syz-executor 84287 428861 96950 0 3 0x82 nanoslp syz-executor 52348 178095 96950 0 3 0x82 nanoslp syz-executor 55496 340579 96950 0 3 0x82 nanoslp syz-executor 33428 291423 96950 0 3 0x82 nanoslp syz-executor 2660 121259 96950 0 2 0x2 syz-executor 57746 215587 96950 0 3 0x82 nanoslp syz-executor 65722 35271 96950 0 3 0x82 nanoslp syz-executor 96950 347835 14273 0 3 0x82 kqread syz-executor 14273 236339 76608 0 3 0x10008a sigsusp ksh 76608 157678 22218 0 3 0x98 kqread sshd-session 22218 466260 40811 0 3 0x92 kqread sshd-session 85417 215794 1 0 3 0x100083 ttyin getty 40811 348041 1 0 3 0x88 kqread sshd 12476 227771 79466 74 3 0x1100092 bpf pflogd 79466 311423 1 0 3 0x80 sbwait pflogd 57527 88417 16717 73 3 0x1100090 kqread syslogd 16717 110431 1 0 3 0x100082 sbwait syslogd 98071 268101 1 0 3 0x100080 kqread resolvd 56442 342578 25190 77 3 0x100092 kqread dhcpleased 23150 198572 25190 77 3 0x100092 kqread dhcpleased 25190 87186 1 0 3 0x80 kqread dhcpleased 85307 463461 0 0 3 0x14200 bored smr 80232 259839 0 0 2 0x14200 zerothread 58978 70589 0 0 3 0x14200 aiodoned aiodoned 31029 423386 0 0 3 0x14200 syncer update 20528 115416 0 0 3 0x14200 cleaner cleaner 65436 115705 0 0 3 0x14200 reaper reaper 51059 31105 0 0 3 0x14200 pgdaemon pagedaemon 80823 501741 0 0 3 0x14200 bored viomb 98258 321740 0 0 3 0x40014200 acpi0 acpi0 916 80731 0 0 3 0x40014200 idle1 89788 150385 0 0 3 0x14200 bored softnet1 23886 497336 0 0 3 0x14200 bored softnet0 59549 379663 0 0 3 0x14200 bored systqmp 42543 394493 0 0 3 0x14200 bored systq 1697 28281 0 0 3 0x14200 tmoslp softclockmp 78324 263340 0 0 3 0x40014200 tmoslp softclock 99038 514163 0 0 3 0x40014200 idle0 1 35547 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 (0xffffffff83843a80) #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 83798 (syz-executor) thread 0xffff8000fffee548 (53810) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838e6f08) #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 (0xffffffff83843a80) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11053 12087K 12281K 166960K 12173 0 pcb 18 12K 12K 166960K 24 0 rtable 248 8K 8K 166960K 372 0 pf 34 17K 19K 166960K 51 0 ifaddr 43 7K 7K 166960K 47 0 ifgroup 55 2K 2K 166960K 59 0 sysctl 3 1K 9K 166960K 7 0 counters 72 37K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 1494 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1344 84K 85K 166960K 1382 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 150 0 proc 69 115K 164K 166960K 530 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 31 148K 148K 166960K 31 0 exec 0 0K 1K 166960K 374 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 246 167K 177K 166960K 3445 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 43 86K 108K 166960K 1277 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 4 0 NDP 28 2K 2K 166960K 30 0 temp 36 8666K 8730K 166960K 5836 0 kqueue 15 24K 30K 166960K 29 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 37 0 33 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 35 0 16 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 9 0 5 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 80 0 69 2 0 2 2 0 8 0 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 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 16 0 0 1 0 1 1 0 8 0 pfstkey 128 16 0 0 1 0 1 1 0 8 0 pfstate 448 16 0 0 2 0 2 2 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 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1599 0 82 96 0 96 96 0 8 0 ffsino 296 1599 0 82 118 0 118 118 0 8 0 nchpl 144 1801 0 99 64 0 64 64 0 8 0 rtmask 32 1 0 0 1 0 1 1 0 8 0 vnodes 216 1695 0 0 95 0 95 95 0 8 0 namei 1024 5399 0 5399 2 0 2 2 0 8 2 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 5891 0 5890 3 1 2 2 1 8 1 plimitpl 152 28 0 10 1 0 1 1 0 8 0 sigapl 424 459 0 411 7 0 7 7 0 8 1 knotepl 120 730 0 0 23 0 23 23 0 8 0 kqueuepl 224 30 0 18 1 0 1 1 0 8 0 pipepl 344 116 0 89 3 0 3 3 0 8 0 fdescpl 528 443 0 411 3 0 3 3 0 8 0 filepl 160 1559 0 1341 10 0 10 10 0 8 0 lockfpl 104 12 0 10 1 0 1 1 0 8 0 lockfspl 48 7 0 5 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 71 0 58 1 0 1 1 0 8 0 zombiepl 144 411 0 411 1 0 1 1 0 8 1 processpl 1232 459 0 411 5 0 5 5 0 8 0 procpl 664 495 0 436 6 0 6 6 0 8 0 sockpl 752 152 0 118 4 0 4 4 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 118 0 0 8 0 8 8 0 8 0 bufpl 280 2351 0 126 159 0 159 159 0 8 0 anonpl 32 3950 0 0 32 0 32 32 0 246 0 amapchunkpl 152 9278 0 8777 21 0 21 21 0 158 0 amappl16 200 2069 0 2049 5 0 5 5 0 8 3 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 6 0 6 1 0 1 1 0 8 1 amappl13 176 428 0 427 1 0 1 1 0 8 0 amappl12 168 797 0 755 3 0 3 3 0 8 0 amappl11 160 11 0 10 1 0 1 1 0 8 0 amappl10 152 52 0 38 1 0 1 1 0 8 0 amappl9 144 247 0 247 1 0 1 1 0 8 1 amappl8 136 28 0 26 1 0 1 1 0 8 0 amappl7 128 76 0 75 1 0 1 1 0 8 0 amappl6 120 280 0 267 1 0 1 1 0 8 0 amappl5 112 78 0 68 1 0 1 1 0 8 0 amappl4 104 418 0 388 1 0 1 1 0 8 0 amappl3 96 1409 0 1298 4 1 3 3 0 8 0 amappl2 88 517 0 459 2 0 2 2 0 8 0 amappl1 80 9107 0 8508 15 0 15 15 0 8 1 amappl 88 2719 0 2552 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 443 0 411 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 443 0 411 1 0 1 1 0 8 0 vmmpekpl 168 5414 0 5379 2 0 2 2 0 8 0 vmmpepl 168 36448 0 34504 86 0 86 86 0 357 1 vmsppl 488 442 0 411 5 0 5 5 0 8 0 rwobjpl 80 13713 0 12694 24 0 24 24 0 8 1 pdppl 4096 893 0 822 99 12 87 87 0 8 16 pvpl 32 9600 0 0 78 0 78 78 0 265 0 pmappl 256 442 0 411 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 268 0 14 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83824ff0) 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(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c409b70,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7e1ee8a83370, count: 9 ddb{0}> trace x86_ipi_db(ffffffff83824ff0) 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(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c409b70,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7e1ee8a83370, count: -6 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(ffffffff833b5bf3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f0cea,ffffffff8340af2f,1cb,ffffffff833a8449) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c401bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff8000fffee548) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000317c23e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c782d88,81,fffffd80097fd478,ffff8000fffee548) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8062c26188,ffff8000fffee548) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8062c26188,ffff8000fffee548) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff8000317c2640) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000317c2640) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721c40a1540, count: 2 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5bf3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f0cea,ffffffff8340af2f,1cb,ffffffff833a8449) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff80003c401bf0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001590000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637e,81,2000,ffff8000fffee548) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000317c23e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c782d88,81,fffffd80097fd478,ffff8000fffee548) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8062c26188,ffff8000fffee548) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8062c26188,ffff8000fffee548) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8062c26188,ffff8000fffee548) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff8000317c2640) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000317c2640) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721c40a1540, count: -13