panic: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/pipex.c", line 459 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8348716e) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301a,ffffffff8341a01f,1cb,ffffffff8347bd21) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff8000ffff69e0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(6381,1,2000,ffff80002a77dca0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c90d720) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa806174db48,1,fffffa8007ffd680,ffff80002a77dca0) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d sys/kern/vfs_vnops.c:621 fdrop(fffffa806d236c48,ffff80002a77dca0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa806d236c48,ffff80002a77dca0) at closef+0x190 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a77dca0) at fdfree+0x115 sys/kern/kern_descrip.c:1196 exit1(ffff80002a77dca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a77dca0,ffff80003c90da80,ffff80003c90d9d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c90da70, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "rn != NULL" failed: file "/syzkaller/managers/main/kernel/sys/net/pipex.c", line 459 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8348716e) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301a,ffffffff8341a01f,1cb,ffffffff8347bd21) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff8000ffff69e0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(6381,1,2000,ffff80002a77dca0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c90d720) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa806174db48,1,fffffa8007ffd680,ffff80002a77dca0) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d sys/kern/vfs_vnops.c:621 fdrop(fffffa806d236c48,ffff80002a77dca0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa806d236c48,ffff80002a77dca0) at closef+0x190 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a77dca0) at fdfree+0x115 sys/kern/kern_descrip.c:1196 exit1(ffff80002a77dca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a77dca0,ffff80003c90da80,ffff80003c90d9d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c90da80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c90da80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cb0f6529630, count: -16 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003c90d500 rbx 0x1 rdx 0 rcx 0 rax 0xffff80002a77dca0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb022dcd74cd5f1aa r11 0xd8966060c7da5182 r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff82f20b05 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c90d4f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=127087 pid=98688 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a77dca0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a77ca78,0xffff80002a77d4e8 process=0xffff8000ffff8498 user=0xffff80003c908000, vmspace=0xfffffa807e3b5a28 estcpu=0, cpticks=6, pctcpu=0.2, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 895 248382 90059 0 3 0x80 nanoslp syz-executor 895 428328 90059 0 3 0x4000080 msgwait syz-executor 895 203554 90059 0 3 0x4000080 fsleep syz-executor 93918 34821 44322 60929 2 0x10 syz-executor 93918 250439 44322 60929 2 0x4000010 syz-executor 5402 333527 94971 0 2 0 syz-executor 19982 391114 72828 0 2 0 syz-executor 19982 146681 72828 0 2 0x4000000 syz-executor 17667 519252 18770 0 2 0x1 syz-executor 17667 60707 18770 0 3 0x4000081 fsleep syz-executor 97661 155439 15308 0 2 0 syz-executor 97661 21601 15308 0 3 0x4000080 lockf syz-executor 97661 43154 15308 0 3 0x4000080 lockf syz-executor 15308 137930 70325 0 3 0x82 nanoslp syz-executor 25884 38535 70325 0 2 0x10000082 syz-executor 70603 424096 70325 0 3 0x82 nanoslp syz-executor 18770 59053 70325 0 2 0xc82 syz-executor 72828 90695 70325 0 2 0xc82 syz-executor 44322 120040 70325 0 3 0x82 nanoslp syz-executor 94971 2895 70325 0 3 0x82 nanoslp syz-executor 90059 95905 70325 0 3 0x82 nanoslp syz-executor 70325 202290 7499 0 3 0x82 kqread syz-executor 7499 364598 3171 0 3 0x10008a sigsusp ksh 3171 45772 68988 0 3 0x98 kqread sshd-session 68988 197996 99725 0 3 0x92 kqread sshd-session 59580 515956 1 0 3 0x100083 ttyin getty 99725 57215 1 0 3 0x88 kqread sshd 76419 80283 94211 73 3 0x1100090 kqread syslogd 94211 339801 1 0 3 0x100082 sbwait syslogd 24229 485713 1 0 3 0x100080 kqread resolvd 69032 150371 75544 77 2 0x100012 dhcpleased 19974 81632 75544 77 3 0x100092 kqread dhcpleased 75544 20524 1 0 3 0x80 kqread dhcpleased 19847 388632 0 0 3 0x14200 bored smr 54778 95022 0 0 2 0x14200 zerothread 99161 334166 0 0 3 0x14200 aiodoned aiodoned 56522 123154 0 0 3 0x14200 syncer update 7443 292516 0 0 3 0x14200 cleaner cleaner 85423 124413 0 0 3 0x14200 reaper reaper 96339 484681 0 0 3 0x14200 pgdaemon pagedaemon 84269 300256 0 0 3 0x14200 bored viomb 81850 313618 0 0 3 0x40014200 acpi0 acpi0 79492 105790 0 0 3 0x14200 bored softnet0 63063 213673 0 0 3 0x14200 bored systqmp 46215 499750 0 0 3 0x14200 bored systq 33972 153261 0 0 3 0x40014200 tmoslp softclock 3455 439428 0 0 3 0x40014200 idle0 1 473357 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11038 12178K 12373K 166960K 12226 0 pcb 18 14K 16K 166960K 117 0 rtable 250 8K 8K 166960K 414 0 pf 32 13K 20K 166960K 53 0 ifaddr 42 7K 7K 166960K 56 0 ifgroup 50 2K 2K 166960K 66 0 sysctl 2 1K 9K 166960K 6 0 counters 34 17K 18K 166960K 43 0 ioctlops 0 0K 4K 166960K 47 0 iov 0 0K 4K 166960K 68 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1301 82K 82K 166960K 1432 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 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 17 61K 240K 166960K 257 0 sigio 0 0K 0K 166960K 1 0 proc 60 59K 100K 166960K 540 0 subproc 72 4K 4K 166960K 83 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 12 0 in_multi 100 7K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 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 213 142K 152K 166960K 3810 0 UVM aobj 3 2K 2K 166960K 4 0 pinsyscall 38 76K 96K 166960K 1380 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 11 0K 2K 166960K 36 0 temp 37 9102K 9108K 166960K 6340 0 kqueue 16 22K 26K 166960K 42 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 48 0 45 1 0 1 1 0 8 0 rtentry 136 124 0 13 4 0 4 4 0 8 0 unpcb 144 83 0 63 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 97 0 91 7 6 1 7 0 8 0 arp 96 20 0 2 1 0 1 1 0 8 0 ipq 40 3 0 2 1 0 1 1 0 8 0 ipqe 40 7 0 6 1 0 1 1 0 8 0 inpcb 328 288 0 274 10 8 2 10 0 8 0 nd6 112 28 0 3 1 0 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 9 0 8 1 0 1 1 0 8 0 pfstscr 40 3 0 0 1 0 1 1 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 4 0 0 1 0 1 1 0 8 0 pfstkey 128 4 0 0 1 0 1 1 0 8 0 pfstate 384 2 0 0 1 0 1 1 0 8 0 pfrule 1360 1 0 1 1 1 0 1 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 500 0 44 29 0 29 29 0 8 0 art_table 40 501 0 44 5 0 5 5 0 8 0 art_node 32 124 0 23 1 0 1 1 0 8 0 semapl 72 4 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 1 1 1 0 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1736 0 266 93 0 93 93 0 8 0 ffsino 256 1736 0 266 93 0 93 93 0 8 0 nchpl 144 2065 0 358 64 0 64 64 0 8 0 rtmask 32 1 0 0 1 0 1 1 0 8 0 vnodes 216 1863 0 0 104 0 104 104 0 8 0 namei 1024 6641 0 6641 1 0 1 1 0 8 1 kstatmem 264 37 0 14 2 0 2 2 0 8 0 scxspl 216 9024 0 9024 8 7 1 8 1 8 1 plimitpl 152 201 0 184 1 0 1 1 0 8 0 sigapl 424 540 0 497 6 1 5 6 0 8 0 knotepl 120 6475 0 6280 10 3 7 10 0 8 1 kqueuepl 184 48 0 36 1 0 1 1 0 8 0 pipepl 304 130 0 103 3 0 3 3 0 8 0 fdescpl 448 527 0 498 5 1 4 5 0 8 0 filepl 120 2405 0 2173 10 2 8 10 0 8 0 lockfpl 104 44 0 39 1 0 1 1 0 8 0 lockfspl 48 16 0 13 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 212 0 200 1 0 1 1 0 8 0 zombiepl 144 499 0 497 1 0 1 1 0 8 0 processpl 1152 540 0 497 4 0 4 4 0 8 0 procpl 664 685 0 635 5 0 5 5 0 8 0 sockpl 552 425 0 388 10 7 3 10 0 8 0 mcl64k 65536 10 0 10 1 1 0 1 0 8 0 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl8k 8192 4 0 4 1 1 0 1 0 8 0 mcl4k 4096 2603 0 2546 14 6 8 14 0 8 0 mcl2k 2048 216 0 215 1 0 1 1 0 8 0 mtagpl 96 4 0 4 1 1 0 1 0 8 0 mbufpl 256 5526 0 5358 12 0 12 12 0 8 0 bufpl 280 3399 0 102 236 0 236 236 0 8 0 anonpl 24 96459 0 93340 52 9 43 52 0 186 0 amapchunkpl 152 10876 0 10435 23 3 20 23 0 158 0 amappl16 200 1433 0 1408 15 4 11 15 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 425 0 423 1 0 1 1 0 8 0 amappl13 176 115 0 105 1 0 1 1 0 8 0 amappl12 168 767 0 739 2 0 2 2 0 8 0 amappl11 160 22 0 22 1 1 0 1 0 8 0 amappl10 152 56 0 46 1 0 1 1 0 8 0 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 99 0 96 1 0 1 1 0 8 0 amappl7 128 163 0 152 1 0 1 1 0 8 0 amappl6 120 160 0 158 1 0 1 1 0 8 0 amappl5 112 106 0 99 1 0 1 1 0 8 0 amappl4 104 261 0 246 1 0 1 1 0 8 0 amappl3 96 2012 0 1911 3 0 3 3 0 8 0 amappl2 88 533 0 477 2 0 2 2 0 8 0 amappl1 80 10567 0 10023 14 2 12 14 0 8 0 amappl 88 3083 0 2933 4 0 4 4 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 128 253 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 3 0 1 1 0 1 1 0 8 0 uaddrrnd 24 527 0 498 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 527 0 498 1 0 1 1 0 8 0 vmmpekpl 168 6112 0 6082 2 0 2 2 0 8 0 vmmpepl 168 42010 0 40263 91 6 85 91 0 357 0 vmsppl 368 526 0 498 4 1 3 4 0 8 0 rwobjpl 40 14818 0 13896 13 0 13 13 0 8 0 pdppl 4096 1060 0 996 98 32 66 80 0 8 2 pvpl 32 246659 0 236978 129 20 109 129 0 265 0 pmappl 216 526 0 498 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 369 0 53 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8348716e) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301a,ffffffff8341a01f,1cb,ffffffff8347bd21) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff8000ffff69e0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(6381,1,2000,ffff80002a77dca0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c90d720) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa806174db48,1,fffffa8007ffd680,ffff80002a77dca0) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d sys/kern/vfs_vnops.c:621 fdrop(fffffa806d236c48,ffff80002a77dca0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa806d236c48,ffff80002a77dca0) at closef+0x190 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a77dca0) at fdfree+0x115 sys/kern/kern_descrip.c:1196 exit1(ffff80002a77dca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a77dca0,ffff80003c90da80,ffff80003c90d9d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c90da80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c90da80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cb0f6529630, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8348716e) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c301a,ffffffff8341a01f,1cb,ffffffff8347bd21) at __assert+0x29 sys/kern/subr_prf.c:-1 pipex_unlink_session_locked(ffff8000ffff69e0) at pipex_unlink_session_locked+0x429 pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff8000015e1000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:151 pppacclose(6381,1,2000,ffff80002a77dca0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c90d720) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa806174db48,1,fffffa8007ffd680,ffff80002a77dca0) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa806d236c48,ffff80002a77dca0) at vn_closefile+0x11d sys/kern/vfs_vnops.c:621 fdrop(fffffa806d236c48,ffff80002a77dca0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa806d236c48,ffff80002a77dca0) at closef+0x190 sys/kern/kern_descrip.c:1265 fdfree(ffff80002a77dca0) at fdfree+0x115 sys/kern/kern_descrip.c:1196 exit1(ffff80002a77dca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a77dca0,ffff80003c90da80,ffff80003c90d9d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c90da80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c90da80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cb0f6529630, count: -16