Warning: Permanently added '10.128.0.198' (ECDSA) to the list of known hosts. executing program panic: pool_do_get: semupl free list modified: page 0xfffffd806ed2f000; item addr 0xfffffd806ed2fe00; offset 0x10=0xdeaf4153 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *365791 33244 0 0 0 1K syz-executor2005 380075 40611 0 0x12 0 0 sshd db_enter() at db_enter+0x18 panic() at panic+0x16c pool_do_get(d10a8966aaa08f6e,2,ffffffff822fbb50) at pool_do_get+0x4bc pool_get() at pool_get+0x104 semundo_adjust(720e511c7c24f638,0,ffff800020c04de8,3,ffff800020c04dee) at semun do_adjust+0xee sys_semop(7f95ac01b9b37c20,0,ffff800020be44c0) at sys_semop+0x797 syscall(707e873ebaf652ec) at syscall+0x5a0 Xsyscall(6,0,22e,0,7f7ffffec6e0,0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffec720, count: 7 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}> show panic pool_do_get: semupl free list modified: page 0xfffffd806ed2f000; item addr 0xfffffd806ed2fe00; offset 0x10=0xdeaf4153 ddb{1}> trace db_enter() at db_enter+0x18 panic() at panic+0x16c pool_do_get(d10a8966aaa08f6e,2,ffffffff822fbb50) at pool_do_get+0x4bc pool_get() at pool_get+0x104 semundo_adjust(720e511c7c24f638,0,ffff800020c04de8,3,ffff800020c04dee) at semundo_adjust+0xee sys_semop(7f95ac01b9b37c20,0,ffff800020be44c0) at sys_semop+0x797 syscall(707e873ebaf652ec) at syscall+0x5a0 Xsyscall(6,0,22e,0,7f7ffffec6e0,0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffec720, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c04b30 rbx 0xffff800020c04bd0 rdx 0xffffffff81f31b5c cy_pio_rec+0x15d8 rcx 0x201 rax 0x1 r8 0xffffffff81b488b4 kprintf+0x174 r9 0x1 r10 0x5961057003919bfe r11 0x91e5fe029ab1389e r12 0x3000000008 r13 0xffff800020c04b40 r14 0x100 r15 0x1 rip 0xffffffff8135b538 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c04b20 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor2005) pid=365791 stat=onproc flags process=0 proc=0 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020be5078,0xffffffff822fd4d8 process=0xffff800020bca6a8 user=0xffff800020c00000, vmspace=0xfffffd806e923440 estcpu=1, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *33244 365791 41592 0 7 0 syz-executor2005 41592 227912 78535 0 3 0x82 nanosleep syz-executor2005 78535 115543 40611 0 3 0x10008a pause ksh 40611 380075 67739 0 7 0x12 sshd 10001 146679 1 0 3 0x100083 ttyin getty 67739 246502 1 0 3 0x80 select sshd 99007 2662 2240 73 3 0x100090 kqread syslogd 2240 114204 1 0 3 0x100082 netio syslogd 97780 480017 1 77 3 0x100090 poll dhclient 40439 437524 1 0 3 0x80 poll dhclient 55893 238785 0 0 3 0x14200 pgzero zerothread 78618 451373 0 0 3 0x14200 aiodoned aiodoned 81369 219966 0 0 3 0x14200 syncer update 3827 239647 0 0 3 0x14200 cleaner cleaner 7087 401020 0 0 3 0x14200 reaper reaper 76019 382624 0 0 3 0x14200 pgdaemon pagedaemon 58593 162403 0 0 3 0x14200 bored crynlk 84496 362342 0 0 3 0x14200 bored crypto 96415 49265 0 0 3 0x40014200 acpi0 acpi0 26680 272494 0 0 3 0x40014200 idle1 70891 456264 0 0 3 0x14200 bored softnet 13996 447313 0 0 3 0x14200 bored systqmp 84368 491029 0 0 3 0x14200 bored systq 90467 407245 0 0 3 0x40014200 bored softclock 32237 243883 0 0 3 0x40014200 idle0 1 365921 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex semupl r = 0 (0xffffffff822fbb60) locked @ /syzkaller/managers/multicore/kernel/sys/kern/subr_pool.c:583 Process 33244 (syz-executor2005) thread 0xffff800020be44c0 (365791) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff822d88a8) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 exclusive mutex semupl r = 0 (0xffffffff822fbb60) locked @ /syzkaller/managers/multicore/kernel/sys/kern/subr_pool.c:583 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9442 6315K 6316K 78643K 10529 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 61 2K 2K 78643K 115 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1166 73K 73K 78643K 1171 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 4 0K 0K 78643K 4 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 40 38K 46K 78643K 201 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 149 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 47 2K 3K 78643K 663 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 3 0K 0K 78643K 3 0 0 temp 30 2347K 2411K 78643K 1690 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 2 0 0 1 0 1 1 0 8 0 inpcbpl 280 22 0 16 1 0 1 1 0 8 0 plimitpl 152 13 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 pool(0xffffffff822fbb50:semupl): page inconsistency: page 0xfffffd806ed2f000; 34 on list, 0 missing, 35 items per page semapl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1381 0 16 45 0 45 45 0 8 0 ffsino 272 1381 0 16 91 0 91 91 0 8 0 nchpl 144 1553 0 30 57 0 57 57 0 8 0 uvmvnodes 72 1390 0 0 26 0 26 26 0 8 0 vnodes 200 1390 0 0 74 0 74 74 0 8 0 namei 1024 3255 0 3255 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2350 0 2350 9 2 7 7 0 8 7 sigapl 432 175 0 164 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 114 0 107 2 1 1 1 0 8 0 fdescpl 488 176 0 164 2 0 2 2 0 8 0 filepl 152 807 0 765 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 32 3 0 3 1 1 0 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 164 0 164 2 1 1 1 0 8 1 processpl 840 190 0 164 4 0 4 4 0 8 0 procpl 600 190 0 164 3 0 3 3 0 8 0 sockpl 384 64 0 48 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 56 0 0 7 0 7 7 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 74 0 0 5 0 5 5 0 8 0 bufpl 256 2001 0 261 109 0 109 109 0 8 0 anonpl 16 17042 0 15940 8 2 6 7 0 125 1 amapchunkpl 152 523 0 487 2 0 2 2 0 158 0 amappl16 192 69 0 64 1 0 1 1 0 8 0 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 1 0 1 1 1 0 1 0 8 0 amappl13 168 16 0 13 1 0 1 1 0 8 0 amappl12 160 6 0 6 1 0 1 1 0 8 1 amappl11 152 172 0 163 1 0 1 1 0 8 0 amappl10 144 42 0 42 2 1 1 1 0 8 1 amappl9 136 201 0 200 1 0 1 1 0 8 0 amappl8 128 100 0 94 1 0 1 1 0 8 0 amappl7 120 30 0 26 1 0 1 1 0 8 0 amappl6 112 39 0 34 1 0 1 1 0 8 0 amappl5 104 143 0 131 1 0 1 1 0 8 0 amappl4 96 256 0 237 1 0 1 1 0 8 0 amappl3 88 112 0 107 1 0 1 1 0 8 0 amappl2 80 552 0 517 1 0 1 1 0 8 0 amappl1 72 11453 0 11062 16 6 10 16 0 8 0 amappl 72 379 0 359 1 0 1 1 0 75 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 176 0 164 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 176 0 164 1 0 1 1 0 8 0 vmmpekpl 168 5120 0 5100 1 0 1 1 0 8 0 vmmpepl 168 23323 0 22619 53 19 34 47 0 357 3 vmsppl 360 175 0 164 2 0 2 2 0 8 0 pdppl 4096 359 0 328 5 0 5 5 0 8 0 pvpl 32 69966 0 67215 30 4 26 26 0 265 3 pmappl 224 175 0 164 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 233 0 3 7 0 7 7 0 8 0 ddb{1}>