login: Y-} Å‹íN27panic: 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 420628 64296 0 0 0 1 syz-executor.1 * 80359 64296 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(ffffffff82672640,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff82672438) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800023b88f40) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd8007dee054,fffffd8067308f08) at alltraps_kern_meltdown+0x7b frag6_input(ffff800023b892a8,ffff800023b892b4,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800023b892a8,ffff800023b892b4,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800023b892a8,ffff800023b892b4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800023b892a8,ffff800023b892b4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd8067792e00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd8067792e00,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd8067d0c900,ffff800000b2c400,fffffd806f6ca2a0,0,0,fffffd806f6ca230) at ip6_output+0xd59 rip6_output(fffffd8067d0c900,fffffd806f6cb600,ffff800023b89618,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 end trace frame: 0xffff800023b896b0, 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(ffffffff82672640,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff82672438) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800023b88f40) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd8007dee054,fffffd8067308f08) at alltraps_kern_meltdown+0x7b frag6_input(ffff800023b892a8,ffff800023b892b4,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800023b892a8,ffff800023b892b4,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800023b892a8,ffff800023b892b4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800023b892a8,ffff800023b892b4,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd8067792e00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd8067792e00,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd8067d0c900,ffff800000b2c400,fffffd806f6ca2a0,0,0,fffffd806f6ca230) at ip6_output+0xd59 rip6_output(fffffd8067d0c900,fffffd806f6cb600,ffff800023b89618,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806f6cb600,9,fffffd8067d0c900,0,0,ffff800020a5e770) at rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 sosend(fffffd806f6cb600,0,ffff800023b89848,0,0,0) at sosend+0x668 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020a5e770,4,ffff800023b89848,0,ffff800023b89950) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff800020a5e770,ffff800023b898e8,ffff800023b89950) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800023b899c0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023b899c0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,c,0,3,aab2392010) at Xsyscall+0x128 end of kernel end trace frame: 0xad32453110, count: -20 ddb{0}> show registers rdi 0xffffffff81be0707 db_enter+0x17 rsi 0x2fcf __ALIGN_SIZE+0x1fcf rbp 0xffff800023b88ca0 rbx 0xffff800023b88d50 rdx 0x2fd0 __ALIGN_SIZE+0x1fd0 rcx 0xffff800022388000 rax 0xffff800022388000 r8 0xffffffff81da97e3 kprintf+0x173 r9 0x1 r10 0x25 r11 0xaa4aeeae89f97f4 r12 0x3000000008 r13 0xffff800023b88cb0 r14 0x100 r15 0x1 rip 0xffffffff81be0708 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023b88c90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=80359 stat=onproc flags process=0 proc=4000000 pri=70, usrpri=70, nice=20 forw=0xffffffffffffffff, list=0xffff800020a5e9e8,0xffffffff82655a00 process=0xffff800020adce00 user=0xffff800023b84000, vmspace=0xfffffd807f00c8a0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 64296 420628 46544 0 7 0 syz-executor.1 *64296 80359 46544 0 7 0x4000000 syz-executor.1 72625 121110 42428 0 3 0x82 nanosleep syz-executor.0 46544 326765 42428 0 3 0x82 nanosleep syz-executor.1 11495 425953 1 0 3 0x100083 ttyin getty 4255 71978 0 0 3 0x14200 bored sosplice 42428 317883 72865 0 3 0x82 thrsleep syz-fuzzer 42428 707 72865 0 3 0x4000082 nanosleep syz-fuzzer 42428 437745 72865 0 3 0x4000082 thrsleep syz-fuzzer 42428 443105 72865 0 3 0x4000082 thrsleep syz-fuzzer 42428 214271 72865 0 3 0x4000082 thrsleep syz-fuzzer 42428 385102 72865 0 3 0x4000082 thrsleep syz-fuzzer 42428 322898 72865 0 3 0x4000082 nanosleep syz-fuzzer 42428 509106 72865 0 3 0x4000082 thrsleep syz-fuzzer 42428 82696 72865 0 3 0x4000082 thrsleep syz-fuzzer 42428 327164 72865 0 3 0x4000082 kqread syz-fuzzer 72865 208799 25113 0 3 0x10008a pause ksh 25113 148196 67802 0 3 0x92 select sshd 67802 349334 1 0 3 0x80 select sshd 69453 104382 14554 74 3 0x100092 bpf pflogd 14554 398384 1 0 3 0x80 netio pflogd 89440 59310 35925 73 3 0x100090 kqread syslogd 35925 496187 1 0 3 0x100082 netio syslogd 616 13215 0 0 3 0x14200 pgzero zerothread 85358 341086 0 0 3 0x14200 aiodoned aiodoned 91426 472852 0 0 3 0x14200 syncer update 25368 361937 0 0 3 0x14200 cleaner cleaner 60820 502405 0 0 3 0x14200 reaper reaper 74190 254339 0 0 3 0x14200 pgdaemon pagedaemon 27950 434987 0 0 3 0x14200 bored crynlk 27325 51939 0 0 3 0x14200 bored crypto 18374 396613 0 0 3 0x40014200 acpi0 acpi0 69744 228200 0 0 3 0x40014200 idle1 89906 393574 0 0 3 0x14200 bored softnet 73638 396717 0 0 3 0x14200 bored systqmp 60331 314524 0 0 3 0x14200 bored systq 42048 299972 0 0 3 0x40014200 bored softclock 90541 366606 0 0 3 0x40014200 idle0 20126 504730 0 0 3 0x14200 bored smr 1 78787 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 (0xffffffff82484090) #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 64296 (syz-executor.1) thread 0xffff800020a5e770 (80359) exclusive rwlock netlock r = 0 (0xffffffff824be8a8) #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 (0xffffffff82484090) #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 9634 6426K 15550K 78643K 61874 0 0 pcb 14 8K 8K 78643K 2179 0 0 rtable 119 13K 13K 78643K 4085 0 0 ifaddr 93 28K 36K 78643K 2352 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2389 0 0 iov 0 0K 32K 78643K 1966 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1191 75K 77K 78643K 20114 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 280 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 2334 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 20811 0 0 sigio 0 0K 0K 78643K 264 0 0 proc 54 51K 83K 78643K 4998 0 0 subproc 32 2K 2K 78643K 1198 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 1773 0 0 in_multi 33 2K 2K 78643K 1388 0 0 ether_multi 1 0K 0K 78643K 84 0 0 mrt 1 0K 0K 78643K 65 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 132 583K 583K 78643K 132 0 0 exec 0 0K 1K 78643K 2621 0 0 pfkey data 0 0K 0K 78643K 6 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 104 21K 31K 78643K 67815 0 0 UVM aobj 130 4K 5K 78643K 147 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 2203 0 0 NDP 23 0K 1K 78643K 728 0 0 temp 249 3557K 4197K 78643K 339917 0 0 kqueue 0 0K 0K 78643K 172 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 64 152 0 146 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 905 0 905 15 15 0 1 0 8 0 rtentry 112 834 0 790 2 0 2 2 0 8 0 unpcb 120 6662 0 6654 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 8285 0 8285 2 2 0 2 0 8 0 tcpcb 544 3789 0 3784 1 0 1 1 0 8 0 inpcb 280 11358 0 11348 32 30 2 2 0 8 1 rttmr 72 12 0 12 10 10 0 1 0 8 0 ip6q 72 3 0 2 3 2 1 1 0 8 0 ip6af 48 1 0 0 1 0 1 1 0 8 0 nd6 48 210 0 204 1 0 1 1 0 8 0 pkpcb 40 54 0 54 23 23 0 1 0 8 0 swfcl 56 10 0 0 1 0 1 1 0 8 0 ppxss 1128 411 0 411 44 43 1 1 0 8 1 pffrag 232 36 0 36 19 19 0 1 0 482 0 pffrnode 88 36 0 36 19 19 0 1 0 8 0 pffrent 40 98 0 98 23 23 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 24 546 0 530 1 0 1 1 0 8 0 pfstkey 112 546 0 530 3 2 1 2 0 8 0 pfstate 328 546 0 529 6 4 2 4 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 3456 0 3258 20 7 13 14 0 8 0 art_table 32 3457 0 3258 2 0 2 2 0 8 0 art_node 16 814 0 774 1 0 1 1 0 8 0 sysvmsgpl 40 31 0 8 1 0 1 1 0 8 0 semapl 112 2328 0 2318 1 0 1 1 0 8 0 shmpl 112 145 0 17 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 33289 0 31811 48 0 48 48 0 8 0 ffsino 272 33289 0 31811 100 1 99 99 0 8 0 nchpl 144 62042 0 60405 62 0 62 62 0 8 0 uvmvnodes 72 8144 0 0 149 0 149 149 0 8 0 vnodes 200 8144 0 0 429 0 429 429 0 8 0 namei 1024 204217 0 204217 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 40 0 40 28 28 0 1 0 8 0 scxspl 192 180234 0 180234 72 71 1 7 0 8 1 plimitpl 152 1899 0 1892 1 0 1 1 0 8 0 sigapl 432 20816 0 20803 4 2 2 3 0 8 0 futexpl 56 260944 0 260944 1 0 1 1 0 8 1 knotepl 112 4571 0 4552 1 0 1 1 0 8 0 kqueuepl 104 4003 0 4001 1 0 1 1 0 8 0 pipepl 112 11574 0 11555 26 25 1 2 0 8 0 fdescpl 488 20817 0 20803 3 0 3 3 0 8 0 filepl 152 122371 0 122280 54 49 5 7 0 8 1 lockfpl 104 6636 0 6636 3 2 1 1 0 8 1 lockfspl 48 2193 0 2193 3 2 1 1 0 8 1 sessionpl 112 95 0 86 1 0 1 1 0 8 0 pgrppl 48 260 0 251 1 0 1 1 0 8 0 ucredpl 96 23989 0 23981 1 0 1 1 0 8 0 zombiepl 144 20813 0 20812 2 1 1 1 0 8 0 processpl 896 20843 0 20812 4 0 4 4 0 8 0 procpl 632 63605 0 63564 35 30 5 5 0 8 1 srpgc 64 148 0 148 57 57 0 1 0 8 0 sosppl 128 290 0 290 59 58 1 1 0 8 1 sockpl 384 19191 0 19178 44 42 2 4 0 8 0 mcl64k 65536 954 0 0 107 90 17 66 0 8 1 mcl16k 16384 29 0 0 4 2 2 3 0 8 0 mcl12k 12288 65 0 0 3 1 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 49 0 0 5 2 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 241 0 0 24 4 20 24 0 8 0 mtagpl 80 152 0 0 1 0 1 1 0 8 0 mbufpl 256 1352 0 0 41 10 31 40 0 8 0 bufpl 256 59662 0 51384 518 0 518 518 0 8 0 anonpl 16 1872674 0 1860374 331 270 61 69 0 124 0 amapchunkpl 152 125068 0 124964 91 85 6 12 0 158 0 amappl16 192 102542 0 101832 463 425 38 49 0 8 1 amappl15 184 2144 0 2144 12 12 0 1 0 8 0 amappl14 176 2519 0 2513 1 0 1 1 0 8 0 amappl13 168 6683 0 6682 12 11 1 1 0 8 0 amappl12 160 1381 0 1379 1 0 1 1 0 8 0 amappl11 152 1972 0 1963 1 0 1 1 0 8 0 amappl10 144 4366 0 4359 1 0 1 1 0 8 0 amappl9 136 3067 0 3062 1 0 1 1 0 8 0 amappl8 128 2368 0 2339 1 0 1 1 0 8 0 amappl7 120 4452 0 4443 1 0 1 1 0 8 0 amappl6 112 1824 0 1816 1 0 1 1 0 8 0 amappl5 104 2082 0 2071 1 0 1 1 0 8 0 amappl4 96 22336 0 22307 2 1 1 2 0 8 0 amappl3 88 4079 0 4068 1 0 1 1 0 8 0 amappl2 80 165689 0 165621 3 1 2 3 0 8 0 amappl1 72 456213 0 455806 26 16 10 20 0 8 0 amappl 80 65032 0 64997 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 64 146 0 17 3 0 3 3 0 8 0 uaddrrnd 24 20817 0 20803 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 20817 0 20803 1 0 1 1 0 8 0 vmmpekpl 168 153427 0 153389 2 0 2 2 0 8 0 vmmpepl 168 2530148 0 2528383 724 630 94 110 0 357 9 vmsppl 368 20816 0 20803 2 0 2 2 0 8 0 pdppl 4096 41641 0 41606 7 2 5 6 0 8 0 pvpl 32 4967730 0 4952281 751 602 149 171 0 265 11 pmappl 232 20816 0 20803 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 843 0 123 21 0 21 21 0 8 0