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 451397 13321 0 0 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344b298) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348dc9d,ffffffff834aae98,1cb,ffffffff83449605) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff8000fffe2098) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001606000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001606000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637f,1,2000,ffff8000373c5cb0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000373c2910) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fbc9548,1,fffffd80097fd7b8,ffff8000373c5cb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b245540,ffff8000373c5cb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b245540,ffff8000373c5cb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b245540,ffff8000373c5cb0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806b245540,ffff8000373c5cb0) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000373c5cb0) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000373c5cb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000373c5cb0,ffff8000373c2c80,ffff8000373c2bd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff8000373c2c70, 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(ffffffff8344b298) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348dc9d,ffffffff834aae98,1cb,ffffffff83449605) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff8000fffe2098) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001606000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001606000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637f,1,2000,ffff8000373c5cb0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000373c2910) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fbc9548,1,fffffd80097fd7b8,ffff8000373c5cb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b245540,ffff8000373c5cb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b245540,ffff8000373c5cb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b245540,ffff8000373c5cb0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806b245540,ffff8000373c5cb0) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000373c5cb0) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000373c5cb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000373c5cb0,ffff8000373c2c80,ffff8000373c2bd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000373c2c80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000373c2c80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77ab69e85880, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000373c26e0 rbx 0xffffffff83954e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000373c5cb0 rax 0xffffffff83953ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xea20bdb58b2b01d6 r11 0x408ed2fccd278929 r12 0xffffffff83954c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff83044655 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000373c26d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=328707 pid=9798 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000373c5cb0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000373c4d20,0xffff8000fffe87f8 process=0xffff8000fffef038 user=0xffff8000373bd000, vmspace=0xfffffd806b8c39a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 97320 207556 33464 0 2 0 syz-executor 13321 451397 40721 0 7 0 syz-executor 13321 102046 40721 0 2 0x4000000 syz-executor 13321 85502 40721 0 2 0x4000000 syz-executor 13321 171802 40721 0 3 0x4000080 fsleep syz-executor 34322 384998 82461 0 2 0 syz-executor 34322 469674 82461 0 3 0x4000080 kqread syz-executor 22260 24863 15506 0 2 0xc80 syz-executor 22260 289799 15506 0 3 0x4000000 biowait syz-executor 22260 421474 15506 0 3 0x4000080 fsleep syz-executor 22260 45294 15506 0 3 0x4000080 fsleep syz-executor 47803 391278 34171 0 2 0xc80 syz-executor 47803 285252 34171 0 3 0x4000080 kqsel syz-executor 47803 103034 34171 0 3 0x4000080 fsleep syz-executor 93937 222314 5197 0 2 0xc80 syz-executor 93937 389513 5197 0 3 0x4000080 fsleep syz-executor 93937 501139 5197 0 3 0x4000080 kqsel syz-executor 94942 68443 66183 0 2 0 syz-executor 94942 296404 66183 0 3 0x4000080 fifor syz-executor 94942 242280 66183 0 3 0x4000080 fsleep syz-executor 83067 388321 23146 0 2 0x2 syz-executor 40721 274007 23146 0 3 0x82 nanoslp syz-executor 34171 237499 23146 0 3 0x82 nanoslp syz-executor 15506 198927 23146 0 3 0x82 nanoslp syz-executor 33464 38099 23146 0 2 0x2 syz-executor 5197 339245 23146 0 2 0xc82 syz-executor 82461 40938 23146 0 2 0xc82 syz-executor 66183 513285 23146 0 3 0x82 nanoslp syz-executor 23146 344139 80090 0 3 0x82 kqread syz-executor 80090 125835 29101 0 3 0x10008a sigsusp ksh 29101 370824 21369 0 3 0x98 kqread sshd-session 21369 94036 2061 0 3 0x92 kqread sshd-session 97586 44365 1 0 3 0x100083 ttyin getty 2061 169724 1 0 3 0x88 kqread sshd 79359 258757 89686 74 3 0x1100092 bpf pflogd 89686 150783 1 0 3 0x80 sbwait pflogd 32313 179765 54751 73 3 0x1100090 kqread syslogd 54751 457468 1 0 3 0x100082 sbwait syslogd 63469 419015 1 0 3 0x100080 kqread resolvd 69060 395358 11022 77 2 0x100012 dhcpleased 9083 214687 11022 77 3 0x100092 kqread dhcpleased 11022 418064 1 0 3 0x80 kqread dhcpleased 37132 507694 0 0 3 0x14200 bored smr 72060 137981 0 0 3 0x14200 pgzero zerothread 34624 196663 0 0 3 0x14200 aiodoned aiodoned 784 454808 0 0 3 0x14200 syncer update 53276 70094 0 0 3 0x14200 cleaner cleaner 73808 405651 0 0 3 0x14200 reaper reaper 29822 133111 0 0 3 0x14200 pgdaemon pagedaemon 88189 140336 0 0 3 0x14200 bored viomb 83301 482982 0 0 3 0x40014200 acpi0 acpi0 91379 319089 0 0 3 0x40014200 idle1 79642 405059 0 0 3 0x14200 bored softnet1 75890 297875 0 0 2 0x14200 softnet0 38379 158993 0 0 3 0x14200 bored systqmp 41759 69306 0 0 3 0x14200 bored systq 12953 282288 0 0 3 0x14200 tmoslp softclockmp 67541 101598 0 0 3 0x40014200 tmoslp softclock 55477 282716 0 0 3 0x40014200 idle0 1 188149 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 (0xffffffff839565e0) #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 22260 (syz-executor) thread 0xffff8000fffe94e0 (289799) exclusive rrwlock inode r = 0 (0xfffffd806c86d560) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 75890 (softnet0) thread 0xffff8000ffffe298 (297875) 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 11069 12314K 12408K 166960K 12234 0 pcb 18 12K 12K 166960K 21 0 rtable 244 8K 8K 166960K 368 0 pf 36 18K 21K 166960K 63 0 ifaddr 43 7K 7K 166960K 51 0 ifgroup 55 2K 2K 166960K 63 0 sysctl 1 1K 9K 166960K 5 0 counters 72 37K 38K 166960K 86 0 ioctlops 0 0K 4K 166960K 1500 0 iov 0 0K 16K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1366 86K 86K 166960K 1487 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 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 197 0 sigio 0 0K 0K 166960K 3 0 proc 75 131K 164K 166960K 563 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 10 0 in_multi 99 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 392 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 247 167K 181K 166960K 3778 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 43 86K 104K 166960K 1364 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 12 0K 2K 166960K 32 0 temp 38 9074K 9146K 166960K 4510 0 kqueue 15 24K 28K 166960K 37 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 40 0 36 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 70 0 48 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 19 0 15 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 165 0 157 6 0 6 6 0 8 5 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 8 0 7 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 pfrktable 1344 2 0 1 1 0 1 1 0 8 0 pftag 88 3 0 2 1 0 1 1 0 8 0 pfstitem 24 23 0 0 1 0 1 1 0 8 0 pfstkey 128 23 0 0 1 0 1 1 0 8 0 pfstate 448 23 0 0 3 0 3 3 0 8 0 pfrule 1360 23 0 17 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 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 3 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 1691 0 218 93 0 93 93 0 8 0 ffsino 296 1691 0 218 114 0 114 114 0 8 0 nchpl 144 1965 0 258 64 0 64 64 0 8 0 rtmask 32 1 0 0 1 0 1 1 0 8 0 vnodes 216 1879 0 0 105 0 105 105 0 8 0 namei 1024 6033 0 6033 2 0 2 2 0 8 2 percpumem 16 58 0 7 1 0 1 1 0 8 0 kstatmem 264 34 0 8 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7031 0 7030 10 2 8 8 1 8 7 plimitpl 152 36 0 18 1 0 1 1 0 8 0 sigapl 424 518 0 470 7 0 7 7 0 8 1 knotepl 120 299 0 0 10 0 10 10 0 8 0 kqueuepl 224 46 0 30 2 0 2 2 0 8 0 pipepl 344 131 0 104 3 0 3 3 0 8 0 fdescpl 528 502 0 470 3 0 3 3 0 8 0 filepl 160 1972 0 1678 13 0 13 13 0 8 0 lockfpl 104 41 0 35 1 0 1 1 0 8 0 lockfspl 48 22 0 16 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 124 0 111 1 0 1 1 0 8 0 zombiepl 144 471 0 470 1 0 1 1 0 8 0 processpl 1232 518 0 470 5 0 5 5 0 8 1 procpl 664 646 0 585 6 0 6 6 0 8 0 sockpl 752 276 0 242 10 0 10 10 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 107 0 0 14 0 14 14 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 150 0 0 10 0 10 10 0 8 0 bufpl 280 2469 0 105 169 0 169 169 0 8 0 anonpl 32 7580 0 0 62 0 62 62 0 246 0 amapchunkpl 152 10677 0 10170 22 0 22 22 0 158 1 amappl16 200 2266 0 2208 15 0 15 15 0 8 11 amappl15 192 7 0 7 1 0 1 1 0 8 1 amappl14 184 440 0 439 1 0 1 1 0 8 0 amappl13 176 120 0 108 1 0 1 1 0 8 0 amappl12 168 752 0 722 2 0 2 2 0 8 0 amappl11 160 17 0 17 1 0 1 1 0 8 1 amappl10 152 108 0 94 1 0 1 1 0 8 0 amappl9 144 262 0 262 1 0 1 1 0 8 1 amappl8 136 105 0 103 1 0 1 1 0 8 0 amappl7 128 151 0 138 1 0 1 1 0 8 0 amappl6 120 184 0 183 1 0 1 1 0 8 0 amappl5 112 110 0 100 1 0 1 1 0 8 0 amappl4 104 312 0 291 1 0 1 1 0 8 0 amappl3 96 1923 0 1809 4 0 4 4 0 8 1 amappl2 88 539 0 476 2 0 2 2 0 8 0 amappl1 80 9602 0 9005 15 0 15 15 0 8 2 amappl 88 3030 0 2857 5 0 5 5 0 92 0 uvmvnodes 80 100 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 128 254 0 254 2 1 1 1 0 8 1 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 24 502 0 470 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 502 0 470 1 0 1 1 0 8 0 vmmpekpl 168 5910 0 5876 2 0 2 2 0 8 0 vmmpepl 168 40656 0 38670 96 0 96 96 0 357 8 vmsppl 488 501 0 470 5 0 5 5 0 8 1 rwobjpl 80 14850 0 13782 27 0 27 27 0 8 1 pdppl 4096 1011 0 940 99 22 77 83 0 8 6 pvpl 32 14940 0 0 121 0 121 121 0 265 0 pmappl 256 501 0 470 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 269 0 25 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(ffffffff8344b298) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348dc9d,ffffffff834aae98,1cb,ffffffff83449605) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff8000fffe2098) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff800001606000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff800001606000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(637f,1,2000,ffff8000373c5cb0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff8000373c2910) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fbc9548,1,fffffd80097fd7b8,ffff8000373c5cb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b245540,ffff8000373c5cb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b245540,ffff8000373c5cb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b245540,ffff8000373c5cb0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd806b245540,ffff8000373c5cb0) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000373c5cb0) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000373c5cb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000373c5cb0,ffff8000373c2c80,ffff8000373c2bd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000373c2c80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000373c2c80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77ab69e85880, 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 end of kernel end trace frame: 0x73bc85324300, count: 12 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 end of kernel end trace frame: 0x73bc85324300, count: -3