login: panic: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 38826 85838 0 0 0x4000000 1 syz-executor.0 214400 22060 0 0x14000 0x40000200 0 softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff826445e0,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff826443d8) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800022b885a0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd8007df3854,fffffd80621f1ec0) at alltraps_kern_meltdown+0x7b frag6_input(ffff800022b88908,ffff800022b88914,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800022b88908,ffff800022b88914,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd806806ab00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd806806ab00,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd807196aa00,ffff800000a8a380,fffffd806f6bbc78,0,0,fffffd806f6bbc08) at ip6_output+0xd59 rip6_output(fffffd807196aa00,fffffd807cae8380,ffff800022b88c78,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 end trace frame: 0xffff800022b88d10, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff826445e0,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff826443d8) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800022b885a0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd8007df3854,fffffd80621f1ec0) at alltraps_kern_meltdown+0x7b frag6_input(ffff800022b88908,ffff800022b88914,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800022b88908,ffff800022b88914,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd806806ab00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd806806ab00,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd807196aa00,ffff800000a8a380,fffffd806f6bbc78,0,0,fffffd806f6bbc08) at ip6_output+0xd59 rip6_output(fffffd807196aa00,fffffd807cae8380,ffff800022b88c78,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd807cae8380,9,fffffd807196aa00,0,0,ffff800020a5ec60) at rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 sosend(fffffd807cae8380,0,ffff800022b88ea8,0,0,0) at sosend+0x668 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020a5ec60,3,ffff800022b88ea8,0,ffff800022b88fb0) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff800020a5ec60,ffff800022b88f48,ffff800022b88fb0) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800022b89020) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022b89020) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(0,0,c,0,3,e105bc4f010) at Xsyscall+0x128 end of kernel end trace frame: 0xe1277ce7340, count: -20 ddb{1}> show registers rdi 0xffffffff8195cff7 db_enter+0x17 rsi 0x3952 __ALIGN_SIZE+0x2952 rbp 0xffff800022b88300 rbx 0xffff800022b883b0 rdx 0x3953 __ALIGN_SIZE+0x2953 rcx 0xffff800022d8e000 rax 0xffff800022d8e000 r8 0xffffffff814c44b3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x34d3910bb9c8a92f r12 0x3000000008 r13 0xffff800022b88310 r14 0x100 r15 0x1 rip 0xffffffff8195cff8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022b882f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=38826 stat=onproc flags process=0 proc=4000000 pri=85, usrpri=85, nice=20 forw=0xffffffffffffffff, list=0xffff800020a5fb30,0xffff800020ac0020 process=0xffff800020adca80 user=0xffff800022b84000, vmspace=0xfffffd807f00c450 estcpu=35, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71001 46832 23807 0 2 0 syz-executor.1 85838 25628 77478 0 2 0 syz-executor.0 *85838 38826 77478 0 7 0x4000000 syz-executor.0 77478 269251 65793 0 3 0x82 nanosleep syz-executor.0 23807 393837 65793 0 3 0x82 nanosleep syz-executor.1 40502 509341 1 0 3 0x100083 ttyin getty 76903 439624 0 0 3 0x14200 bored sosplice 65793 502495 78442 0 3 0x82 thrsleep syz-fuzzer 65793 284395 78442 0 3 0x4000082 nanosleep syz-fuzzer 65793 410079 78442 0 3 0x4000082 thrsleep syz-fuzzer 65793 453119 78442 0 3 0x4000082 kqread syz-fuzzer 65793 383981 78442 0 3 0x4000082 thrsleep syz-fuzzer 65793 306473 78442 0 3 0x4000082 nanosleep syz-fuzzer 65793 469693 78442 0 3 0x4000082 thrsleep syz-fuzzer 65793 159824 78442 0 3 0x4000082 thrsleep syz-fuzzer 65793 99287 78442 0 3 0x4000082 thrsleep syz-fuzzer 65793 215338 78442 0 3 0x4000082 thrsleep syz-fuzzer 78442 430526 36837 0 3 0x10008a pause ksh 36837 234411 84816 0 3 0x92 select sshd 84816 351071 1 0 3 0x80 select sshd 48703 100980 74314 74 3 0x100092 bpf pflogd 74314 163922 1 0 3 0x80 netio pflogd 44213 214940 20447 73 3 0x100090 kqread syslogd 20447 59750 1 0 3 0x100082 netio syslogd 88966 304674 1 77 3 0x100090 poll dhclient 24833 435292 1 0 3 0x80 poll dhclient 26421 195938 0 0 3 0x14200 pgzero zerothread 29727 271168 0 0 3 0x14200 aiodoned aiodoned 37676 431174 0 0 3 0x14200 syncer update 28940 445088 0 0 3 0x14200 cleaner cleaner 23855 56081 0 0 3 0x14200 reaper reaper 31278 472624 0 0 3 0x14200 pgdaemon pagedaemon 72259 508196 0 0 3 0x14200 bored crynlk 97978 180586 0 0 3 0x14200 bored crypto 70443 194481 0 0 3 0x40014200 acpi0 acpi0 25343 204223 0 0 3 0x40014200 idle1 41621 182871 0 0 3 0x14200 bored softnet 50360 300994 0 0 3 0x14200 bored systqmp 76703 412067 0 0 3 0x14200 bored systq 22060 214400 0 0 7 0x40014200 softclock 45171 53350 0 0 3 0x40014200 idle0 63612 164484 0 0 3 0x14200 bored smr 1 27071 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/netinet6/frag6.c:57 r = 0 (0xffffffff8249ae90) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 frag6_input+0x237 sys/netinet6/frag6.c:183 #4 ip_deliver+0x353 sys/netinet/ip_input.c:665 #5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] #5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 #6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171 #7 if_input_local+0x121 sys/net/if.c:783 #8 ip6_output+0xd59 #9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 #10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 #11 sosend+0x668 sys/kern/uipc_socket.c:524 #12 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #13 sys_write+0x83 sys/kern/sys_generic.c:284 #14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #15 Xsyscall+0x128 Process 85838 (syz-executor.0) thread 0xffff800020a5ec60 (38826) exclusive rwlock netlock r = 0 (0xffffffff824b59f8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x52c sys/kern/uipc_socket.c:512 #3 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #4 sys_write+0x83 sys/kern/sys_generic.c:284 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive mutex /syzkaller/managers/multicore/kernel/sys/netinet6/frag6.c:57 r = 0 (0xffffffff8249ae90) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 frag6_input+0x237 sys/netinet6/frag6.c:183 #4 ip_deliver+0x353 sys/netinet/ip_input.c:665 #5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] #5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 #6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171 #7 if_input_local+0x121 sys/net/if.c:783 #8 ip6_output+0xd59 #9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 #10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 #11 sosend+0x668 sys/kern/uipc_socket.c:524 #12 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #13 sys_write+0x83 sys/kern/sys_generic.c:284 #14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #15 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9656 6485K 14856K 78643K 54062 0 0 pcb 14 8K 8K 78643K 1801 0 0 rtable 119 13K 13K 78643K 6125 0 0 ifaddr 100 29K 36K 78643K 2120 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2354 0 0 iov 0 0K 32K 78643K 1655 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1195 75K 77K 78643K 17102 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 225 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 1K 1K 78643K 1891 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 17480 0 0 sigio 0 0K 0K 78643K 209 0 0 proc 55 51K 83K 78643K 4530 0 0 subproc 32 2K 2K 78643K 1134 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 1417 0 0 in_multi 33 2K 2K 78643K 1232 0 0 ether_multi 1 0K 0K 78643K 66 0 0 mrt 2 0K 0K 78643K 43 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 162 715K 715K 78643K 162 0 0 exec 0 0K 1K 78643K 2314 0 0 pfkey data 0 0K 4K 78643K 16 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 137 24K 34K 78643K 57548 0 0 UVM aobj 130 4K 4K 78643K 143 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 2 0K 1K 78643K 1881 0 0 NDP 25 0K 1K 78643K 660 0 0 temp 263 3557K 4197K 78643K 251049 0 0 kqueue 0 0K 0K 78643K 151 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 139 0 133 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 804 0 802 1 0 1 1 0 8 0 rtentry 112 778 0 734 5 3 2 2 0 8 0 unpcb 120 5381 0 5371 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 8642 0 8642 1 1 0 1 0 8 0 tcpcb 544 3279 0 3274 1 0 1 1 0 8 0 inpcb 280 9461 0 9448 16 14 2 2 0 8 1 rttmr 72 4 0 4 4 4 0 1 0 8 0 ip6q 72 3 0 2 3 2 1 1 0 8 0 ip6af 48 3 0 2 2 1 1 1 0 8 0 nd6 48 198 0 192 1 0 1 1 0 8 0 pkpcb 40 112 0 112 34 34 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 349 0 349 47 46 1 1 0 8 1 pffrag 232 39 0 39 17 17 0 1 0 482 0 pffrnode 88 39 0 39 17 17 0 1 0 8 0 pffrent 40 99 0 99 21 21 0 1 0 8 0 pfosfp 40 846 0 846 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 21 0 21 0 8 0 pfstitem 24 488 0 479 1 0 1 1 0 8 0 pfstkey 112 489 0 480 3 1 2 2 0 8 0 pfstate 328 489 0 480 9 6 3 4 0 8 2 pfrule 1360 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 3216 0 3019 30 17 13 14 0 8 0 art_table 32 3217 0 3019 2 0 2 2 0 8 0 art_node 16 757 0 717 1 0 1 1 0 8 0 sysvmsgpl 40 36 0 28 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 1887 0 1877 1 0 1 1 0 8 0 shmpl 112 141 0 13 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 28117 0 26651 48 0 48 48 0 8 0 ffsino 272 28117 0 26651 100 1 99 99 0 8 0 nchpl 144 52302 0 50675 62 0 62 62 0 8 0 uvmvnodes 72 7354 0 0 134 0 134 134 0 8 0 vnodes 200 7354 0 0 388 0 388 388 0 8 0 namei 1024 172913 0 172913 5 4 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 31 0 31 23 22 1 1 0 8 1 scxspl 192 151571 0 151571 54 53 1 6 0 8 1 plimitpl 152 1734 0 1726 1 0 1 1 0 8 0 sigapl 432 17500 0 17484 5 3 2 3 0 8 0 futexpl 56 219220 0 219220 5 4 1 1 0 8 1 knotepl 112 3942 0 3923 1 0 1 1 0 8 0 kqueuepl 104 3500 0 3498 1 0 1 1 0 8 0 pipepl 112 9836 0 9817 19 18 1 2 0 8 0 fdescpl 488 17501 0 17484 3 0 3 3 0 8 0 filepl 152 103095 0 102995 24 19 5 7 0 8 1 lockfpl 104 5427 0 5427 7 6 1 1 0 8 1 lockfspl 48 1883 0 1883 7 6 1 1 0 8 1 sessionpl 112 94 0 83 1 0 1 1 0 8 0 pgrppl 48 291 0 280 1 0 1 1 0 8 0 ucredpl 96 19230 0 19220 1 0 1 1 0 8 0 zombiepl 144 17485 0 17485 5 4 1 1 0 8 1 processpl 896 17518 0 17485 6 2 4 5 0 8 0 procpl 632 53482 0 53439 13 8 5 5 0 8 1 srpgc 64 132 0 132 54 53 1 1 0 8 1 sosppl 128 215 0 215 52 51 1 1 0 8 1 sockpl 384 15932 0 15912 17 14 3 4 0 8 0 mcl64k 65536 1087 0 0 129 74 55 64 0 8 1 mcl16k 16384 28 0 0 4 2 2 3 0 8 0 mcl12k 12288 73 0 0 2 0 2 2 0 8 0 mcl9k 9216 49 0 0 2 1 1 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 33 0 0 4 1 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 241 0 0 24 13 11 24 0 8 0 mtagpl 80 108 0 0 1 0 1 1 0 8 0 mbufpl 256 1598 0 0 43 6 37 37 0 8 0 bufpl 256 46883 0 39528 460 0 460 460 0 8 0 anonpl 16 1648237 0 1637283 335 273 62 70 0 124 0 amapchunkpl 152 107151 0 107018 102 95 7 20 0 158 0 amappl16 192 88431 0 87744 484 440 44 49 0 8 8 amappl15 184 4200 0 4199 8 7 1 1 0 8 0 amappl14 176 4314 0 4307 1 0 1 1 0 8 0 amappl13 168 2920 0 2918 10 9 1 1 0 8 0 amappl12 160 1501 0 1501 7 7 0 1 0 8 0 amappl11 152 1440 0 1425 1 0 1 1 0 8 0 amappl10 144 2062 0 2057 1 0 1 1 0 8 0 amappl9 136 4149 0 4146 1 0 1 1 0 8 0 amappl8 128 3594 0 3549 2 0 2 2 0 8 0 amappl7 120 2135 0 2125 1 0 1 1 0 8 0 amappl6 112 1291 0 1282 1 0 1 1 0 8 0 amappl5 104 2156 0 2141 1 0 1 1 0 8 0 amappl4 96 17395 0 17358 2 1 1 2 0 8 0 amappl3 88 3929 0 3919 1 0 1 1 0 8 0 amappl2 80 138662 0 138585 3 1 2 3 0 8 0 amappl1 72 386570 0 386138 26 16 10 20 0 8 0 amappl 80 54885 0 54839 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 142 0 13 3 0 3 3 0 8 0 uaddrrnd 24 17501 0 17484 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 17501 0 17484 1 0 1 1 0 8 0 vmmpekpl 168 139581 0 139550 2 0 2 2 0 8 0 vmmpepl 168 2131162 0 2129249 723 616 107 110 0 357 16 vmsppl 368 17500 0 17484 2 0 2 2 0 8 0 pdppl 4096 35009 0 34968 7 1 6 6 0 8 0 pvpl 32 4240521 0 4226331 775 626 149 171 0 265 5 pmappl 232 17500 0 17484 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 821 0 123 21 0 21 21 0 8 0