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 127823 99837 0 0 0 1 syz-executor.1 *313331 99837 0 0 0x4000000 0 syz-executor.1 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(ffffffff8261f770,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff8261f568) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800020b32b50) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd806f5b5054,fffffd8064c67f40) at alltraps_kern_meltdown+0x7b frag6_input(ffff800020b32eb8,ffff800020b32ec4,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800020b32eb8,ffff800020b32ec4,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800020b32eb8,ffff800020b32ec4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800020b32eb8,ffff800020b32ec4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd807f02c900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd807f02c900,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd8064c68f00,ffff800000a41c80,fffffd806f6b9700,0,0,fffffd806f6b9690) at ip6_output+0xd59 rip6_output(fffffd8064c68f00,fffffd8079c35320,ffff800020b33228,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 end trace frame: 0xffff800020b332c0, 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 acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock ddb{0}> 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(ffffffff8261f770,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff8261f568) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800020b32b50) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd806f5b5054,fffffd8064c67f40) at alltraps_kern_meltdown+0x7b frag6_input(ffff800020b32eb8,ffff800020b32ec4,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800020b32eb8,ffff800020b32ec4,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800020b32eb8,ffff800020b32ec4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800020b32eb8,ffff800020b32ec4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd807f02c900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd807f02c900,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd8064c68f00,ffff800000a41c80,fffffd806f6b9700,0,0,fffffd806f6b9690) at ip6_output+0xd59 rip6_output(fffffd8064c68f00,fffffd8079c35320,ffff800020b33228,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8079c35320,9,fffffd8064c68f00,0,0,ffff800020b42ef0) at rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 sosend(fffffd8079c35320,0,ffff800020b33458,0,0,0) at sosend+0x668 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020b42ef0,3,ffff800020b33458,0,ffff800020b33560) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff800020b42ef0,ffff800020b334f8,ffff800020b33560) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800020b335d0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b335d0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,c,0,3,533f93fc010) at Xsyscall+0x128 end of kernel end trace frame: 0x536e705ae00, count: -20 ddb{0}> show registers rdi 0xffffffff819f49b7 db_enter+0x17 rsi 0x32ad __ALIGN_SIZE+0x22ad rbp 0xffff800020b328b0 rbx 0xffff800020b32960 rdx 0x32ae __ALIGN_SIZE+0x22ae rcx 0xffff800020b50000 rax 0xffff800020b50000 r8 0xffffffff81788e23 kprintf+0x173 r9 0x1 r10 0x25 r11 0x679e279d3a9fb94e r12 0x3000000008 r13 0xffff800020b328c0 r14 0x100 r15 0x1 rip 0xffffffff819f49b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b328a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=313331 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b43168,0xffffffff8264e688 process=0xffff800020adca80 user=0xffff800020b2e000, vmspace=0xfffffd807f00c450 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99837 127823 27146 0 7 0 syz-executor.1 *99837 313331 27146 0 7 0x4000000 syz-executor.1 76243 41001 88647 0 2 0 syz-executor.0 76243 208967 88647 0 3 0x4000080 netio syz-executor.0 27146 287173 34361 0 3 0x82 nanosleep syz-executor.1 55652 496402 1 0 3 0x100083 ttyin getty 78433 120419 0 0 3 0x14200 acct acct 88647 381189 34361 0 3 0x82 nanosleep syz-executor.0 44818 327649 0 0 3 0x14200 bored sosplice 34361 309589 13438 0 3 0x82 thrsleep syz-fuzzer 34361 116671 13438 0 3 0x4000082 thrsleep syz-fuzzer 34361 39145 13438 0 3 0x4000082 thrsleep syz-fuzzer 34361 402582 13438 0 3 0x4000082 thrsleep syz-fuzzer 34361 275003 13438 0 3 0x4000082 kqread syz-fuzzer 34361 353266 13438 0 3 0x4000082 thrsleep syz-fuzzer 34361 84760 13438 0 3 0x4000082 thrsleep syz-fuzzer 34361 131369 13438 0 3 0x4000082 thrsleep syz-fuzzer 34361 353878 13438 0 3 0x4000082 thrsleep syz-fuzzer 34361 509422 13438 0 3 0x4000082 thrsleep syz-fuzzer 13438 151646 20820 0 3 0x10008a pause ksh 20820 204950 11079 0 3 0x92 select sshd 11079 104283 1 0 3 0x80 select sshd 89295 201079 14992 74 3 0x100092 bpf pflogd 14992 488112 1 0 3 0x80 netio pflogd 51132 276392 86403 73 3 0x100090 kqread syslogd 86403 323539 1 0 3 0x100082 netio syslogd 72370 411719 1 77 3 0x100090 poll dhclient 47592 254728 1 0 3 0x80 poll dhclient 96886 89102 0 0 2 0x14200 zerothread 13122 80492 0 0 3 0x14200 aiodoned aiodoned 44187 198033 0 0 3 0x14200 syncer update 59564 133392 0 0 3 0x14200 cleaner cleaner 48118 94458 0 0 3 0x14200 reaper reaper 90528 198230 0 0 3 0x14200 pgdaemon pagedaemon 96929 512556 0 0 3 0x14200 bored crynlk 9304 228935 0 0 3 0x14200 bored crypto 72055 89687 0 0 3 0x40014200 acpi0 acpi0 38637 386760 0 0 3 0x40014200 idle1 44075 463487 0 0 3 0x14200 bored softnet 64534 8386 0 0 3 0x14200 bored systqmp 23340 494524 0 0 3 0x14200 bored systq 16943 215902 0 0 3 0x40014200 bored softclock 40663 435685 0 0 3 0x40014200 idle0 55627 250391 0 0 3 0x14200 bored smr 1 68387 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/netinet6/frag6.c:57 r = 0 (0xffffffff824d5590) #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 99837 (syz-executor.1) thread 0xffff800020b42ef0 (313331) exclusive rwlock netlock r = 0 (0xffffffff824d5128) #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 (0xffffffff824d5590) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9596 6470K 7107K 78643K 21640 0 0 pcb 14 8K 8K 78643K 463 0 0 rtable 111 4K 5K 78643K 1468 0 0 ifaddr 83 19K 21K 78643K 556 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1687 0 0 iov 0 0K 32K 78643K 401 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1209 76K 77K 78643K 5205 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 59 0 0 VM map 2 1K 1K 78643K 8 0 0 sem 12 0K 0K 78643K 491 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 4216 0 0 sigio 0 0K 0K 78643K 55 0 0 proc 54 51K 71K 78643K 1255 0 0 subproc 32 2K 2K 78643K 223 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 449 0 0 in_multi 33 2K 2K 78643K 289 0 0 ether_multi 1 0K 0K 78643K 22 0 0 mrt 1 0K 0K 78643K 11 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 96 424K 424K 78643K 96 0 0 exec 0 0K 1K 78643K 718 0 0 pfkey data 0 0K 0K 78643K 4 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 109 22K 30K 78643K 14572 0 0 UVM aobj 130 8K 8K 78643K 158 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 476 0 0 NDP 20 0K 0K 78643K 165 0 0 temp 228 3557K 4196K 78643K 37068 0 0 kqueue 0 0K 0K 78643K 22 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 29 0 23 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 187 0 185 1 0 1 1 0 8 0 rtentry 112 171 0 127 2 0 2 2 0 8 0 unpcb 120 1223 0 1211 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 7057 0 7057 2 2 0 2 0 8 0 tcpcb 544 733 0 728 1 0 1 1 0 8 0 inpcb 280 2254 0 2244 2 1 1 2 0 8 0 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 48 1 0 0 1 0 1 1 0 8 0 nd6 48 39 0 33 1 0 1 1 0 8 0 pkpcb 40 34 0 34 13 12 1 1 0 8 1 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 88 0 88 13 12 1 1 0 8 1 pffrag 232 8 0 8 4 3 1 1 0 482 1 pffrnode 88 8 0 8 4 3 1 1 0 8 1 pffrent 40 20 0 20 5 4 1 1 0 8 1 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 92 0 74 1 0 1 1 0 8 0 pfstkey 112 93 0 75 1 0 1 1 0 8 0 pfstate 328 93 0 75 4 2 2 3 0 8 0 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 256 693 0 500 14 1 13 13 0 8 0 art_table 32 694 0 500 2 0 2 2 0 8 0 art_node 16 166 0 126 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 7 2 1 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 489 0 479 1 0 1 1 0 8 0 shmpl 112 156 0 28 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 7965 0 6542 47 0 47 47 0 8 0 ffsino 272 7965 0 6542 96 0 96 96 0 8 0 nchpl 144 13898 0 12266 62 0 62 62 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 45161 0 45161 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 6 0 6 3 3 0 1 0 8 0 scsiplug 64 10 0 10 7 7 0 1 0 8 0 scxspl 192 39793 0 39793 26 23 3 7 0 8 3 plimitpl 152 456 0 448 1 0 1 1 0 8 0 sigapl 432 4385 0 4369 3 1 2 3 0 8 0 futexpl 56 53390 0 53390 2 1 1 1 0 8 1 knotepl 112 883 0 864 1 0 1 1 0 8 0 kqueuepl 104 881 0 879 1 0 1 1 0 8 0 pipepl 112 2602 0 2583 7 6 1 2 0 8 0 fdescpl 488 4386 0 4369 3 0 3 3 0 8 0 filepl 152 26094 0 25992 16 11 5 7 0 8 1 lockfpl 104 1408 0 1408 3 2 1 1 0 8 1 lockfspl 48 467 0 467 3 2 1 1 0 8 1 sessionpl 112 31 0 20 1 0 1 1 0 8 0 pgrppl 48 75 0 64 1 0 1 1 0 8 0 ucredpl 96 5296 0 5287 1 0 1 1 0 8 0 zombiepl 144 4372 0 4372 3 2 1 1 0 8 1 processpl 896 4406 0 4372 4 0 4 4 0 8 0 procpl 632 13227 0 13182 5 0 5 5 0 8 0 srpgc 64 22 0 22 10 10 0 1 0 8 0 sosppl 128 44 0 44 11 10 1 1 0 8 1 sockpl 384 3727 0 3705 10 7 3 4 0 8 0 mcl64k 65536 262 0 0 33 10 23 33 0 8 1 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 239 0 0 29 3 26 29 0 8 2 mtagpl 80 36 0 0 1 0 1 1 0 8 0 mbufpl 256 697 0 0 30 1 29 29 0 8 0 bufpl 256 14137 0 7118 439 0 439 439 0 8 0 anonpl 16 422678 0 410002 145 77 68 70 0 124 12 amapchunkpl 152 26479 0 26367 39 33 6 10 0 158 0 amappl16 192 22940 0 22212 118 70 48 49 0 8 11 amappl15 184 93 0 93 2 2 0 1 0 8 0 amappl14 176 592 0 588 1 0 1 1 0 8 0 amappl13 168 1367 0 1365 3 2 1 1 0 8 0 amappl12 160 21 0 18 1 0 1 1 0 8 0 amappl11 152 905 0 887 1 0 1 1 0 8 0 amappl10 144 414 0 411 1 0 1 1 0 8 0 amappl9 136 903 0 900 1 0 1 1 0 8 0 amappl8 128 457 0 425 2 0 2 2 0 8 0 amappl7 120 400 0 393 1 0 1 1 0 8 0 amappl6 112 899 0 887 1 0 1 1 0 8 0 amappl5 104 248 0 233 1 0 1 1 0 8 0 amappl4 96 4621 0 4579 5 3 2 2 0 8 0 amappl3 88 888 0 878 1 0 1 1 0 8 0 amappl2 80 34606 0 34524 3 1 2 3 0 8 0 amappl1 72 104141 0 103698 25 15 10 20 0 8 0 amappl 80 13663 0 13623 1 0 1 1 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 64 157 0 28 3 0 3 3 0 8 0 uaddrrnd 24 4392 0 4369 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4392 0 4369 1 0 1 1 0 8 0 vmmpekpl 168 35279 0 35243 2 0 2 2 0 8 0 vmmpepl 168 537623 0 535649 266 164 102 109 0 357 13 vmsppl 368 4385 0 4369 2 0 2 2 0 8 0 pdppl 4096 8791 0 8750 7 1 6 6 0 8 0 pvpl 32 1125069 0 1109095 305 139 166 172 0 265 29 pmappl 232 4391 0 4375 3 2 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 666 0 20 19 0 19 19 0 8 0