panic: spl assertion failure in yield Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *440821 69202 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822509f7) at panic+0x15c sys/kern/subr_prf.c:207 splassert_fail(0,1,ffffffff82225416) at splassert_fail+0x102 sys/kern/subr_prf.c:237 yield() at yield+0x6f sys/kern/sched_bsd.c:304 pool_get(ffffffff825ee3f8,1) at pool_get+0x166 sys/kern/subr_pool.c:588 m_get(1,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sockargs(ffff80001fa0e920,20000040,a,3) at sockargs+0x8d sys/kern/uipc_syscalls.c:1115 sys_connect(ffff80001d789ed0,ffff80001fa0e9a8,ffff80001fa0e9f0) at sys_connect+0x9b sys/kern/uipc_syscalls.c:360 syscall(ffff80001fa0ea70) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c4a6718fb0, count: 5 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 spl assertion failure in yield ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822509f7) at panic+0x15c sys/kern/subr_prf.c:207 splassert_fail(0,1,ffffffff82225416) at splassert_fail+0x102 sys/kern/subr_prf.c:237 yield() at yield+0x6f sys/kern/sched_bsd.c:304 pool_get(ffffffff825ee3f8,1) at pool_get+0x166 sys/kern/subr_pool.c:588 m_get(1,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sockargs(ffff80001fa0e920,20000040,a,3) at sockargs+0x8d sys/kern/uipc_syscalls.c:1115 sys_connect(ffff80001d789ed0,ffff80001fa0e9a8,ffff80001fa0e9f0) at sys_connect+0x9b sys/kern/uipc_syscalls.c:360 syscall(ffff80001fa0ea70) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c4a6718fb0, count: -10 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001fa0e680 rbx 0xffff80001fa0e730 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff8200075f kprintf+0x15f r9 0x1 r10 0x2 r11 0x54433b31225c1286 r12 0x3000000008 r13 0xffff80001fa0e690 r14 0x100 r15 0x1 rip 0xffffffff811a6e98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001fa0e670 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=440821 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d789780,0xffff80001d789040 process=0xffff8000208a6af8 user=0xffff80001fa09000, vmspace=0xfffffd806bc09330 estcpu=1, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 14564 500249 73015 0 2 0 syz-executor.1 14564 178149 73015 0 3 0x4000080 fsleep syz-executor.1 69202 103806 42670 0 2 0 syz-executor.0 *69202 440821 42670 0 7 0x4000000 syz-executor.0 96760 369430 0 0 3 0x14200 bored sosplice 6705 515921 0 0 3 0x14280 nfsidl nfsio 45307 42742 0 0 3 0x14280 nfsidl nfsio 94614 393141 0 0 3 0x14280 nfsidl nfsio 14299 279379 0 0 3 0x14280 nfsidl nfsio 71470 92649 0 0 3 0x14280 nfsidl nfsio 6377 453380 0 0 3 0x14280 nfsidl nfsio 90180 318212 0 0 3 0x14280 nfsidl nfsio 15684 118409 0 0 3 0x14280 nfsidl nfsio 6395 336045 0 0 3 0x14280 nfsidl nfsio 95713 20590 0 0 3 0x14280 nfsidl nfsio 28576 454450 0 0 3 0x14280 nfsidl nfsio 88229 40934 0 0 3 0x14280 nfsidl nfsio 48209 435522 0 0 3 0x14280 nfsidl nfsio 61069 246533 0 0 3 0x14280 nfsidl nfsio 90412 303858 0 0 3 0x14280 nfsidl nfsio 3070 230281 0 0 3 0x14280 nfsidl nfsio 74098 63671 0 0 3 0x14280 nfsidl nfsio 54919 150563 0 0 3 0x14280 nfsidl nfsio 4890 519497 0 0 3 0x14280 nfsidl nfsio 40303 466317 0 0 3 0x14280 nfsidl nfsio 73015 331789 22040 0 3 0x82 nanosleep syz-executor.1 42670 272032 22040 0 3 0x82 nanosleep syz-executor.0 22040 116949 22664 0 3 0x82 thrsleep syz-fuzzer 22040 362958 22664 0 3 0x4000082 nanosleep syz-fuzzer 22040 123196 22664 0 3 0x4000082 thrsleep syz-fuzzer 22040 486470 22664 0 3 0x4000082 thrsleep syz-fuzzer 22040 134077 22664 0 3 0x4000082 thrsleep syz-fuzzer 22040 504070 22664 0 3 0x4000082 thrsleep syz-fuzzer 22040 513779 22664 0 3 0x4000082 thrsleep syz-fuzzer 22040 434639 22664 0 3 0x4000082 kqread syz-fuzzer 22664 218531 49141 0 3 0x10008a pause ksh 49141 485066 66906 0 3 0x92 select sshd 88980 519612 1 0 3 0x100083 ttyin getty 66906 127609 1 0 3 0x80 select sshd 95011 272431 31163 73 3 0x100090 kqread syslogd 31163 489802 1 0 3 0x100082 netio syslogd 72182 224699 1 77 3 0x100090 poll dhclient 26310 366527 1 0 3 0x80 poll dhclient 48788 484708 0 0 3 0x14200 bored smr 7492 84731 0 0 2 0x14200 zerothread 96800 60164 0 0 3 0x14200 aiodoned aiodoned 73316 412369 0 0 3 0x14200 syncer update 53523 422075 0 0 3 0x14200 cleaner cleaner 69277 219404 0 0 3 0x14200 reaper reaper 45621 85403 0 0 3 0x14200 pgdaemon pagedaemon 61441 22382 0 0 3 0x14200 bored crynlk 49873 267264 0 0 3 0x14200 bored crypto 93605 117920 0 0 3 0x40014200 acpi0 acpi0 97603 273540 0 0 3 0x14200 bored softnet 49555 40974 0 0 3 0x14200 bored systqmp 733 303876 0 0 3 0x14200 bored systq 62621 476188 0 0 3 0x40014200 bored softclock 63078 98987 0 0 3 0x40014200 idle0 1 254023 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 9500 6350K 6596K 78643K 11050 0 pcb 13 8K 8K 78643K 61 0 rtable 110 3K 5K 78643K 258 0 ifaddr 78 16K 16K 78643K 103 0 sysctl 2 0K 0K 78643K 2 0 counters 21 16K 16K 78643K 24 0 ioctlops 0 0K 4K 78643K 32 0 iov 0 0K 12K 78643K 112 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1380 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 0K 0K 78643K 2 0 sem 12 1K 1K 78643K 26 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 6 17K 25K 78643K 263 0 sigio 0 0K 0K 78643K 6 0 proc 51 38K 63K 78643K 394 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 24 0 in_multi 71 3K 3K 78643K 101 0 ether_multi 1 0K 0K 78643K 11 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 197 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 123 22K 38K 78643K 1572 0 UVM aobj 9 2K 2K 78643K 9 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 70 0 NDP 11 0K 0K 78643K 18 0 temp 92 3033K 3097K 78643K 12904 0 kqueue 3 4K 8K 78643K 9 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 6 0 0 1 0 1 1 0 8 0 rtpcb 80 37 0 35 1 0 1 1 0 8 0 rtentry 112 46 0 1 2 0 2 2 0 8 0 unpcb 120 147 0 139 1 0 1 1 0 8 0 syncache 264 9 0 9 4 4 0 1 0 8 0 tcpqe 32 248 0 248 1 1 0 1 0 8 0 tcpcb 544 178 0 171 1 0 1 1 0 8 0 ipq 40 2 0 2 1 1 0 1 0 8 0 ipqe 40 90 0 90 1 1 0 1 0 8 0 inpcb 280 369 0 360 2 1 1 2 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 2 0 0 1 0 1 1 0 8 0 pfrktable 1344 13 0 12 2 1 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 112 1 0 0 1 0 1 1 0 8 0 pfstate 328 1 0 0 1 0 1 1 0 8 0 pfrule 1360 5 0 3 3 2 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 194 0 0 13 0 13 13 0 8 0 art_table 32 196 0 0 2 0 2 2 0 8 0 art_node 16 45 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1826 0 432 88 0 88 88 0 8 0 ffsino 240 1826 0 432 83 0 83 83 0 8 0 nchpl 144 2417 0 815 60 0 60 60 0 8 0 uvmvnodes 72 1947 0 0 36 0 36 36 0 8 0 vnodes 208 1947 0 0 103 0 103 103 0 8 0 namei 1024 6770 0 6770 27 26 1 1 0 8 1 vmpool 528 2 0 2 1 1 0 1 0 8 0 pfiaddrpl 120 4 0 4 1 1 0 1 0 8 0 scxspl 192 6459 0 6459 14 13 1 1 0 8 1 plimitpl 152 26 0 19 1 0 1 1 0 8 0 sigapl 424 470 0 420 6 0 6 6 0 8 0 futexpl 56 4923 0 4922 28 27 1 1 0 8 0 knotepl 112 69 0 50 1 0 1 1 0 8 0 kqueuepl 144 25 0 22 1 0 1 1 0 8 0 pipelkpl 16 101 0 90 1 0 1 1 0 8 0 pipepl 120 202 0 181 1 0 1 1 0 8 0 fdescpl 432 435 0 420 2 0 2 2 0 8 0 filepl 120 2970 0 2868 5 1 4 4 0 8 0 lockfpl 104 199 0 198 1 0 1 1 0 8 0 lockfspl 48 51 0 50 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 797 0 789 1 0 1 1 0 8 0 zombiepl 144 421 0 421 2 1 1 1 0 8 1 processpl 920 470 0 420 7 0 7 7 0 8 0 procpl 624 899 0 840 12 7 5 6 0 8 0 sosppl 128 6 0 6 3 3 0 1 0 8 0 sockpl 400 553 0 534 25 23 2 3 0 8 0 mcl64k 65536 20 0 20 6 6 0 1 0 8 0 mcl16k 16384 3 0 3 3 3 0 1 0 8 0 mcl12k 12288 9 0 9 7 7 0 1 0 8 0 mcl9k 9216 7 0 7 5 5 0 1 0 8 0 mcl8k 8192 9 0 9 5 5 0 1 0 8 0 mcl4k 4096 26 0 26 12 12 0 1 0 8 0 mcl2k2 2112 3 0 3 3 3 0 1 0 8 0 mcl2k 2048 73383 0 73323 25 17 8 18 0 8 0 mtagpl 80 20 0 2 2 1 1 1 0 8 0 mbufpl 256 119081 0 118939 48 38 10 31 0 8 0 bufpl 280 3891 0 130 269 0 269 269 0 8 0 anonpl 16 52351 0 36761 71 8 63 64 0 107 0 amapchunkpl 152 2450 0 2324 21 15 6 19 0 158 0 amappl16 192 1912 0 1029 52 7 45 45 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 139 0 131 1 0 1 1 0 8 0 amappl13 168 27 0 24 1 0 1 1 0 8 0 amappl12 160 122 0 120 1 0 1 1 0 8 0 amappl11 152 47 0 37 1 0 1 1 0 8 0 amappl10 144 131 0 124 1 0 1 1 0 8 0 amappl9 136 369 0 367 1 0 1 1 0 8 0 amappl8 128 318 0 280 2 0 2 2 0 8 0 amappl7 120 109 0 96 1 0 1 1 0 8 0 amappl6 112 27 0 21 2 1 1 1 0 8 0 amappl5 104 267 0 257 1 0 1 1 0 8 0 amappl4 96 539 0 509 1 0 1 1 0 8 0 amappl3 88 226 0 217 1 0 1 1 0 8 0 amappl2 80 2649 0 2576 2 0 2 2 0 8 0 amappl1 72 17828 0 17408 23 13 10 17 0 8 0 amappl 80 1095 0 1054 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 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 64 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 437 0 422 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 437 0 422 1 0 1 1 0 8 0 vmmpekpl 168 7130 0 7099 2 0 2 2 0 8 0 vmmpepl 168 58534 0 56476 151 61 90 108 0 357 0 vmsppl 272 436 0 422 3 2 1 2 0 8 0 pdppl 4096 880 0 844 6 1 5 6 0 8 0 pvpl 32 170563 0 151829 185 33 152 156 0 265 0 pmappl 200 436 0 422 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 367 0 144 8 1 7 8 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822509f7) at panic+0x15c sys/kern/subr_prf.c:207 splassert_fail(0,1,ffffffff82225416) at splassert_fail+0x102 sys/kern/subr_prf.c:237 yield() at yield+0x6f sys/kern/sched_bsd.c:304 pool_get(ffffffff825ee3f8,1) at pool_get+0x166 sys/kern/subr_pool.c:588 m_get(1,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sockargs(ffff80001fa0e920,20000040,a,3) at sockargs+0x8d sys/kern/uipc_syscalls.c:1115 sys_connect(ffff80001d789ed0,ffff80001fa0e9a8,ffff80001fa0e9f0) at sys_connect+0x9b sys/kern/uipc_syscalls.c:360 syscall(ffff80001fa0ea70) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c4a6718fb0, count: -10 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822509f7) at panic+0x15c sys/kern/subr_prf.c:207 splassert_fail(0,1,ffffffff82225416) at splassert_fail+0x102 sys/kern/subr_prf.c:237 yield() at yield+0x6f sys/kern/sched_bsd.c:304 pool_get(ffffffff825ee3f8,1) at pool_get+0x166 sys/kern/subr_pool.c:588 m_get(1,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sockargs(ffff80001fa0e920,20000040,a,3) at sockargs+0x8d sys/kern/uipc_syscalls.c:1115 sys_connect(ffff80001d789ed0,ffff80001fa0e9a8,ffff80001fa0e9f0) at sys_connect+0x9b sys/kern/uipc_syscalls.c:360 syscall(ffff80001fa0ea70) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c4a6718fb0, count: -10