panic: kernel diagnostic assertion "(TAILQ_NEXT(inp, inp_queue) == NULL) || (TAILQ_NEXT(inp, inp_queue) == _Q_INVALID)" failed: file "/syzkaller/managers/main/kernel/sys/netinet/in_pcb.c", line 673 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *150711 15772 0 0x14000 0x200 0 softnet0 db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8342de09) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833de45c,ffffffff833c8dfd,2a1,ffffffff833a183a) at __assert+0x29 sys/kern/subr_prf.c:-1 in_pcbunref(fffffd806c043008) at in_pcbunref+0x206 sys/netinet/in_pcb.c:672 tcp_input_solocked(ffff80002a74bb50,ffff80002a74bb5c,0,2,ffff80002a74bb48) at tcp_input_solocked+0xfd sys/netinet/tcp_input.c:2229 tcp_input_mlist(ffffffff839cae60,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1 if_input_process(ffff800000b11800,ffff80002a74bc28,0) at if_input_process+0x229 sys/net/if.c:1015 ifiq_process(ffff800000b11c18) at ifiq_process+0xcd sys/net/ifq.c:874 taskq_thread(ffff80000002c000) at taskq_thread+0xd4 sys/kern/kern_task.c:446 end trace frame: 0x0, count: 6 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 "(TAILQ_NEXT(inp, inp_queue) == NULL) || (TAILQ_NEXT(inp, inp_queue) == _Q_INVALID)" failed: file "/syzkaller/managers/main/kernel/sys/netinet/in_pcb.c", line 673 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8342de09) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833de45c,ffffffff833c8dfd,2a1,ffffffff833a183a) at __assert+0x29 sys/kern/subr_prf.c:-1 in_pcbunref(fffffd806c043008) at in_pcbunref+0x206 sys/netinet/in_pcb.c:672 tcp_input_solocked(ffff80002a74bb50,ffff80002a74bb5c,0,2,ffff80002a74bb48) at tcp_input_solocked+0xfd sys/netinet/tcp_input.c:2229 tcp_input_mlist(ffffffff839cae60,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1 if_input_process(ffff800000b11800,ffff80002a74bc28,0) at if_input_process+0x229 sys/net/if.c:1015 ifiq_process(ffff800000b11c18) at ifiq_process+0xcd sys/net/ifq.c:874 taskq_thread(ffff80000002c000) at taskq_thread+0xd4 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a74b830 rbx 0 rdx 0 rcx 0 rax 0xffff80002a72c290 r8 0 r9 0x8080808080808080 r10 0x2287bb310f0f64bf r11 0xd7aa081fdf9fc17b r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff82aadd35 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a74b820 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (softnet0) tid=150711 pid=15772 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a72c520,0xffff80002a72c010 process=0xffff8000ffffc000 user=0xffff80002a746000, vmspace=0xffffffff838e16a0 estcpu=1, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 92554 390466 97003 0 2 0 syz-executor 92554 106111 97003 0 2 0x4000080 syz-executor 41005 267002 82995 0 2 0 syz-executor 41005 75067 82995 0 3 0x4000080 fsleep syz-executor 72595 377209 54987 0 2 0 syz-executor 72595 487497 54987 0 3 0x4000080 sbwait syz-executor 72595 383681 54987 0 3 0x4000080 sbufrcv syz-executor 1685 453104 75445 0 2 0 syz-executor 1685 8407 75445 0 3 0x4000080 fsleep syz-executor 26878 42382 11110 0 2 0 syz-executor 26878 183027 11110 0 3 0x4000080 piperd syz-executor 26878 141617 11110 0 3 0x4000080 fsleep syz-executor 747 350614 93548 0 2 0xc80 syz-executor 747 299143 93548 0 3 0x4000080 sbwait syz-executor 747 511399 93548 0 3 0x4000080 fsleep syz-executor 11110 222927 65906 0 2 0xc82 syz-executor 54987 407354 65906 0 2 0xc82 syz-executor 75445 47831 65906 0 2 0xc82 syz-executor 63287 285662 1 0 3 0x100083 ttyin getty 38883 114726 0 0 3 0x14200 bored sosplice 97003 520656 65906 0 2 0xc82 syz-executor 54325 498152 65906 0 2 0xc82 syz-executor 15689 365610 65906 0 2 0x2 syz-executor 93548 83017 65906 0 2 0xc82 syz-executor 82995 109499 65906 0 2 0xc82 syz-executor 65906 82239 84467 0 3 0x82 kqread syz-executor 84467 109373 60151 0 3 0x10008a sigsusp ksh 60151 414068 26429 0 3 0x98 kqread sshd-session 26429 327709 80430 0 3 0x92 kqread sshd-session 80430 315852 1 0 3 0x88 kqread sshd 1413 163275 25885 73 3 0x1100090 kqread syslogd 25885 340754 1 0 3 0x100082 sbwait syslogd 5762 26803 1 0 3 0x100080 kqread resolvd 71210 133020 75473 77 3 0x100092 kqread dhcpleased 85763 441199 75473 77 3 0x100092 kqread dhcpleased 75473 419573 1 0 3 0x80 kqread dhcpleased 16709 266314 0 0 3 0x14200 bored smr 76728 61881 0 0 2 0x14200 zerothread 60028 60524 0 0 3 0x14200 aiodoned aiodoned 34439 146063 0 0 3 0x14200 syncer update 1476 45191 0 0 3 0x14200 cleaner cleaner 27611 145220 0 0 3 0x14200 reaper reaper 80479 169889 0 0 3 0x14200 pgdaemon pagedaemon 80701 273557 0 0 3 0x14200 bored viomb 5853 152992 0 0 3 0x40014200 acpi0 acpi0 35181 368249 0 0 3 0x14200 bored softnet3 47135 497712 0 0 3 0x14200 bored softnet2 68487 135421 0 0 3 0x14200 bored softnet1 *15772 150711 0 0 7 0x14200 softnet0 36097 426645 0 0 3 0x14200 bored systqmp 96962 75572 0 0 3 0x14200 bored systq 74124 67640 0 0 2 0x40014200 softclock 35013 434425 0 0 3 0x40014200 idle0 1 104355 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10192 11095K 11813K 166960K 13957 0 pcb 18 13K 14K 166960K 225 0 rtable 180 8K 8K 166960K 578 0 pf 32 13K 16K 166960K 132 0 ifaddr 38 6K 7K 166960K 107 0 ifgroup 52 2K 2K 166960K 175 0 sysctl 4 1K 9K 166960K 46 0 counters 34 17K 18K 166960K 125 0 ioctlops 0 0K 4K 166960K 359 0 iov 2 5K 17K 166960K 135 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1559 98K 98K 166960K 2573 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 6K 10K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 117 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 1131 0 sigio 0 0K 0K 166960K 13 0 proc 60 59K 116K 166960K 688 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 132 0 in_multi 73 5K 7K 166960K 174 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 468 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 239 160K 177K 166960K 11476 0 UVM aobj 24 3K 4K 166960K 26 0 pinsyscall 38 76K 94K 166960K 2240 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 88 0 NDP 12 0K 2K 166960K 74 0 temp 67 8686K 8938K 166960K 94866 0 kqueue 15 24K 32K 166960K 236 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 120 311 0 308 3 0 3 3 0 8 2 rtentry 136 182 0 106 4 0 4 4 0 8 0 unpcb 144 1035 0 1016 6 0 6 6 0 8 5 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 216 0 210 1 0 1 1 0 8 0 arp 88 29 0 14 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 5 0 1 1 0 1 1 0 8 0 inpcb 328 1132 0 1121 7 0 7 7 0 8 5 ip6q 72 2 0 2 1 0 1 1 0 8 1 ip6af 40 5 0 5 1 0 1 1 0 8 1 nd6 104 38 0 21 1 0 1 1 0 8 0 pkpcb 40 9 0 9 1 0 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1072 75 0 73 1 0 1 1 0 8 0 pppxif 1384 6 0 6 1 0 1 1 0 8 1 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfrule 1344 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 725 0 381 29 2 27 29 0 8 5 art_table 32 727 0 381 4 0 4 4 0 8 0 art_node 16 173 0 105 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 7 1 0 1 1 0 8 0 semupl 112 3 0 3 1 0 1 1 0 8 1 semapl 112 113 0 103 1 0 1 1 0 8 0 shmpl 112 23 0 2 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 3337 0 1833 95 0 95 95 0 8 0 ffsino 248 3337 0 1833 95 0 95 95 0 8 0 nchpl 144 4918 0 3220 63 0 63 63 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 uvmvnodes 80 4266 0 0 88 0 88 88 0 8 0 vnodes 216 4266 0 0 237 0 237 237 0 8 0 namei 1024 17338 0 17338 2 0 2 2 0 8 2 kstatmem 264 102 0 78 2 0 2 2 0 8 0 scsiplug 72 6 0 6 1 0 1 1 0 8 1 scxspl 216 14835 0 14835 8 0 8 8 1 8 8 plimitpl 152 364 0 348 1 0 1 1 0 8 0 sigapl 424 1408 0 1362 6 0 6 6 0 8 0 knotepl 120 811795 0 811742 33 22 11 20 0 8 8 kqueuepl 184 442 0 430 4 0 4 4 0 8 3 pipepl 296 196 0 168 3 0 3 3 0 8 0 fdescpl 440 1388 0 1359 5 0 5 5 0 8 1 filepl 120 8765 0 8539 16 1 15 16 0 8 6 lockfpl 104 669 0 666 2 0 2 2 0 8 1 lockfspl 48 307 0 304 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 45 0 29 1 0 1 1 0 8 0 ucredpl 104 1344 0 1333 1 0 1 1 0 8 0 zombiepl 144 1363 0 1362 1 0 1 1 0 8 0 processpl 1160 1408 0 1362 4 0 4 4 0 8 0 procpl 656 2813 0 2758 6 0 6 6 0 8 0 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 528 2523 0 2490 16 6 10 16 0 8 7 mcl64k 65536 32 0 32 1 0 1 1 0 8 1 mcl16k 16384 4 0 4 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 14 0 14 1 0 1 1 0 8 1 mcl4k 4096 3733 0 3682 14 0 14 14 0 8 7 mcl2k 2048 1332 0 1323 10 0 10 10 0 8 8 mtagpl 96 315 0 163 6 0 6 6 0 8 0 mbufpl 256 17133 0 16839 146 117 29 146 0 8 4 bufpl 280 4246 0 119 295 0 295 295 0 8 0 anonpl 24 226557 0 210740 123 0 123 123 0 187 4 amapchunkpl 152 38400 0 37791 31 0 31 31 0 158 5 amappl16 200 5246 0 4535 55 8 47 47 0 8 0 amappl15 192 7 0 7 1 0 1 1 0 8 1 amappl14 184 111 0 101 1 0 1 1 0 8 0 amappl13 176 39 0 39 1 0 1 1 0 8 1 amappl12 168 2039 0 2010 3 0 3 3 0 8 1 amappl11 160 42 0 32 1 0 1 1 0 8 0 amappl10 152 7 0 6 1 0 1 1 0 8 0 amappl9 144 268 0 268 1 0 1 1 0 8 1 amappl8 136 32 0 30 1 0 1 1 0 8 0 amappl7 128 114 0 102 1 0 1 1 0 8 0 amappl6 120 197 0 194 1 0 1 1 0 8 0 amappl5 112 152 0 145 1 0 1 1 0 8 0 amappl4 104 295 0 280 1 0 1 1 0 8 0 amappl3 96 7574 0 7462 4 0 4 4 0 8 1 amappl2 88 661 0 602 2 0 2 2 0 8 0 amappl1 80 12067 0 11523 13 0 13 13 0 8 1 amappl 88 10586 0 10413 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 9 0 9 1 0 1 1 0 8 1 dma128 128 254 0 254 1 0 1 1 0 8 1 dma64 64 7 0 7 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 25 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1388 0 1359 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1388 0 1359 1 0 1 1 0 8 0 vmmpekpl 168 11485 0 11437 3 0 3 3 0 8 0 vmmpepl 168 93481 0 90931 143 0 143 143 0 357 17 vmsppl 360 1387 0 1359 4 0 4 4 0 8 1 rwobjpl 32 29511 0 23677 48 0 48 48 0 8 0 pdppl 4096 2782 0 2718 114 48 66 80 0 8 2 pvpl 32 602416 0 580123 212 0 212 212 0 265 10 pmappl 216 1387 0 1359 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 423 0 167 11 0 11 11 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(ffffffff8342de09) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833de45c,ffffffff833c8dfd,2a1,ffffffff833a183a) at __assert+0x29 sys/kern/subr_prf.c:-1 in_pcbunref(fffffd806c043008) at in_pcbunref+0x206 sys/netinet/in_pcb.c:672 tcp_input_solocked(ffff80002a74bb50,ffff80002a74bb5c,0,2,ffff80002a74bb48) at tcp_input_solocked+0xfd sys/netinet/tcp_input.c:2229 tcp_input_mlist(ffffffff839cae60,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1 if_input_process(ffff800000b11800,ffff80002a74bc28,0) at if_input_process+0x229 sys/net/if.c:1015 ifiq_process(ffff800000b11c18) at ifiq_process+0xcd sys/net/ifq.c:874 taskq_thread(ffff80000002c000) at taskq_thread+0xd4 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8342de09) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833de45c,ffffffff833c8dfd,2a1,ffffffff833a183a) at __assert+0x29 sys/kern/subr_prf.c:-1 in_pcbunref(fffffd806c043008) at in_pcbunref+0x206 sys/netinet/in_pcb.c:672 tcp_input_solocked(ffff80002a74bb50,ffff80002a74bb5c,0,2,ffff80002a74bb48) at tcp_input_solocked+0xfd sys/netinet/tcp_input.c:2229 tcp_input_mlist(ffffffff839cae60,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1 if_input_process(ffff800000b11800,ffff80002a74bc28,0) at if_input_process+0x229 sys/net/if.c:1015 ifiq_process(ffff800000b11c18) at ifiq_process+0xcd sys/net/ifq.c:874 taskq_thread(ffff80000002c000) at taskq_thread+0xd4 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -9