panic: kernel diagnostic assertion "in_enqueue == 0" failed: file "/syzkaller/jobs/openbsd/kernel/sys/dev/ic/pckbc.c", line 737 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *353186 95233 0 0x1000 0x4080000 1 syz-executor.0 450832 86297 73 0x100010 0 0K syslogd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:212 __assert(ffffffff81f9ebf0,ffffffff81f5be29,2e1,ffffffff81fb5f91) at __assert+0x2e sys/kern/subr_prf.c:159 pckbc_cleanup(ffff800000026e00) at pckbc_cleanup+0x228 sys/dev/ic/pckbc.c:737 pckbc_enqueue_cmd(ffff800000026e00,1,ffff800020c44bfe,2,0,1) at pckbc_enqueue_cmd+0x334 sys/dev/ic/pckbc.c:944 pms_ioctl_mouse(ffff80000066c200,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at pms_ioctl_mouse+0x137 wsmouse_do_ioctl(ffff80000064dc00,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at wsmouse_do_ioctl+0x2e3 sys/dev/wscons/wsmouse.c:527 wsmousedoioctl(ffff80000064dc00,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at wsmousedoioctl+0x51 sys/dev/wscons/wsmouse.c:429 wsmux_do_ioctl(ffff800000026d00,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at wsmux_do_ioctl+0x5b3 sys/dev/wscons/wsmux.c:546 VOP_IOCTL(fffffd806fefb310,80045721,ffff800020c44fa0,42,fffffd807f7c6a80,ffff800020b9abd0) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807a34c018,80045721,ffff800020c44fa0,ffff800020b9abd0) at vn_ioctl+0xb6 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b9abd0,ffff800020c450c8,ffff800020c45130) at sys_ioctl+0x5b8 syscall(ffff800020c451a0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c451a0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff39,0,3,482e6aaa0d8) at Xsyscall+0x128 end of kernel end trace frame: 0x484f98c32e0, count: 1 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 kernel diagnostic assertion "in_enqueue == 0" failed: file "/syzkaller/jobs/openbsd/kernel/sys/dev/ic/pckbc.c", line 737 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:212 __assert(ffffffff81f9ebf0,ffffffff81f5be29,2e1,ffffffff81fb5f91) at __assert+0x2e sys/kern/subr_prf.c:159 pckbc_cleanup(ffff800000026e00) at pckbc_cleanup+0x228 sys/dev/ic/pckbc.c:737 pckbc_enqueue_cmd(ffff800000026e00,1,ffff800020c44bfe,2,0,1) at pckbc_enqueue_cmd+0x334 sys/dev/ic/pckbc.c:944 pms_ioctl_mouse(ffff80000066c200,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at pms_ioctl_mouse+0x137 wsmouse_do_ioctl(ffff80000064dc00,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at wsmouse_do_ioctl+0x2e3 sys/dev/wscons/wsmouse.c:527 wsmousedoioctl(ffff80000064dc00,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at wsmousedoioctl+0x51 sys/dev/wscons/wsmouse.c:429 wsmux_do_ioctl(ffff800000026d00,80045721,ffff800020c44fa0,42,ffff800020b9abd0) at wsmux_do_ioctl+0x5b3 sys/dev/wscons/wsmux.c:546 VOP_IOCTL(fffffd806fefb310,80045721,ffff800020c44fa0,42,fffffd807f7c6a80,ffff800020b9abd0) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807a34c018,80045721,ffff800020c44fa0,ffff800020b9abd0) at vn_ioctl+0xb6 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b9abd0,ffff800020c450c8,ffff800020c45130) at sys_ioctl+0x5b8 syscall(ffff800020c451a0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c451a0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff39,0,3,482e6aaa0d8) at Xsyscall+0x128 end of kernel end trace frame: 0x484f98c32e0, count: -14 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c44a20 rbx 0xffff800020c44ad0 rdx 0xffff800020b9abd0 rcx 0 rax 0 r8 0xffffffff81bb7c93 kprintf+0x173 r9 0x1 r10 0x25 r11 0x50769e6c9d4947e5 r12 0x3000000008 r13 0xffff800020c44a30 r14 0x100 r15 0x1 rip 0xffffffff8163e5c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c44a10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=353186 stat=onproc flags process=1000 proc=4080000 pri=0, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff800020b9ae28,0xffff800020b9a028 process=0xffff800020b8c6a8 user=0xffff800020c40000, vmspace=0xfffffd806e7dc440 estcpu=19, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 29202 188590 9630 0 3 0x3000 suspend syz-executor.1 29202 55140 9630 0 3 0x4081000 kbccmd syz-executor.1 29202 209516 9630 0 3 0x4081000 kbccmd syz-executor.1 95233 508074 41791 0 3 0x3000 suspend syz-executor.0 *95233 353186 41791 0 7 0x4081000 syz-executor.0 9630 449269 45912 0 2 0x482 syz-executor.1 41791 311423 45912 0 2 0x482 syz-executor.0 45912 494503 12948 0 3 0x82 thrsleep syz-execprog 45912 315317 12948 0 3 0x4000082 thrsleep syz-execprog 45912 497233 12948 0 3 0x4000082 thrsleep syz-execprog 45912 47544 12948 0 3 0x4000082 thrsleep syz-execprog 45912 396499 12948 0 3 0x4000082 thrsleep syz-execprog 45912 151641 12948 0 3 0x4000082 thrsleep syz-execprog 45912 236110 12948 0 3 0x4000082 thrsleep syz-execprog 45912 152893 12948 0 3 0x4000082 thrsleep syz-execprog 45912 299765 12948 0 3 0x4000082 kqread syz-execprog 45912 58235 12948 0 3 0x4000082 thrsleep syz-execprog 12948 24329 78185 0 3 0x10008a pause ksh 78185 191268 10029 0 3 0x92 select sshd 70761 522943 1 0 3 0x100083 ttyin getty 10029 496494 1 0 3 0x80 select sshd 77489 421136 7745 74 3 0x100092 bpf pflogd 7745 344370 1 0 3 0x80 netio pflogd 86297 450832 51724 73 7 0x100010 syslogd 51724 298617 1 0 3 0x100082 netio syslogd 2290 471648 1 77 3 0x100090 poll dhclient 88130 186859 1 0 3 0x80 poll dhclient 46709 114340 0 0 3 0x14200 pgzero zerothread 28349 232147 0 0 3 0x14200 aiodoned aiodoned 13869 130924 0 0 3 0x14200 syncer update 72853 145552 0 0 3 0x14200 cleaner cleaner 15294 25893 0 0 3 0x14200 reaper reaper 50549 79825 0 0 3 0x14200 pgdaemon pagedaemon 2574 165296 0 0 3 0x14200 bored crynlk 25942 405093 0 0 3 0x14200 bored crypto 22171 465691 0 0 3 0x40014200 acpi0 acpi0 56110 388691 0 0 3 0x40014200 idle1 54620 430053 0 0 3 0x14200 bored softnet 41455 228889 0 0 3 0x14200 bored systqmp 87893 506589 0 0 3 0x14200 bored systq 41503 320470 0 0 3 0x40014200 bored softclock 78411 429461 0 0 3 0x40014200 idle0 71234 446541 0 0 3 0x14200 bored smr 1 7187 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 29202 (syz-executor.1) thread 0xffff800020b9a978 (55140) shared rwlock wsmuxlk r = 0 (0xffff800000026dd0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 wsmux_do_ioctl+0x521 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xb6 sys/kern/vfs_vnops.c:512 #4 sys_ioctl+0x5b8 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #6 Xsyscall+0x128 Process 29202 (syz-executor.1) thread 0xffff800020b9a720 (209516) shared rwlock wsmuxlk r = 0 (0xffff800000026dd0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 wsmux_do_ioctl+0x521 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xb6 sys/kern/vfs_vnops.c:512 #4 sys_ioctl+0x5b8 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #6 Xsyscall+0x128 Process 95233 (syz-executor.0) thread 0xffff800020b9abd0 (353186) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82389ed8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x38c sys/kern/sched_bsd.c:439 #3 sleep_finish+0x110 sys/kern/kern_synch.c:303 #4 tsleep+0x198 sleep_finish_timeout sys/kern/kern_synch.c:327 [inline] #4 tsleep+0x198 sleep_finish_all sys/kern/kern_synch.c:157 [inline] #4 tsleep+0x198 sys/kern/kern_synch.c:148 #5 pckbc_enqueue_cmd+0x2db sys/dev/ic/pckbc.c:941 #6 pms_ioctl_mouse+0x137 #7 wsmouse_do_ioctl+0x2e3 sys/dev/wscons/wsmouse.c:527 #8 wsmousedoioctl+0x51 sys/dev/wscons/wsmouse.c:429 #9 wsmux_do_ioctl+0x5b3 sys/dev/wscons/wsmux.c:546 #10 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #11 vn_ioctl+0xb6 sys/kern/vfs_vnops.c:512 #12 sys_ioctl+0x5b8 #13 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #13 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #14 Xsyscall+0x128 shared rwlock wsmuxlk r = 0 (0xffff800000026dd0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1161 #1 wsmux_do_ioctl+0x521 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xb6 sys/kern/vfs_vnops.c:512 #4 sys_ioctl+0x5b8 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:574 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9461 6395K 6395K 78643K 10548 0 0 pcb 25 9K 9K 78643K 73 0 0 rtable 105 3K 3K 78643K 201 0 0 ifaddr 38 10K 10K 78643K 39 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1469 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1193 75K 75K 78643K 3536 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 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 5 16K 24K 78643K 1542 0 0 proc 52 50K 71K 78643K 359 0 0 subproc 0 0K 1K 78643K 17 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 33 2K 2K 78643K 33 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 230 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 84 20K 20K 78643K 5537 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 6 0K 0K 78643K 10 0 0 temp 55 2718K 2782K 78643K 6474 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 6 0 0 1 0 1 1 0 8 0 inpcbpl 280 43 0 37 1 0 1 1 0 8 0 plimitpl 152 20 0 12 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 syncache 264 8 0 8 1 1 0 1 0 8 0 tcpcb 544 14 0 11 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 15 0 5 1 0 1 1 0 8 0 pfstkey 112 15 0 5 1 0 1 1 0 8 0 pfstate 328 15 0 5 2 0 2 2 0 8 1 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 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6801 0 5374 47 0 47 47 0 8 0 ffsino 272 6801 0 5374 96 0 96 96 0 8 0 nchpl 144 8534 0 6891 62 1 61 61 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 21936 0 21936 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 18213 0 18212 7 6 1 6 0 8 0 sigapl 432 1764 0 1748 3 1 2 3 0 8 0 futexpl 56 7117 0 7117 2 1 1 1 0 8 1 knotepl 112 107 0 90 1 0 1 1 0 8 0 kqueuepl 104 3 0 1 1 0 1 1 0 8 0 pipepl 112 226 0 207 2 1 1 1 0 8 0 fdescpl 488 1765 0 1748 3 0 3 3 0 8 0 filepl 152 7682 0 7612 4 1 3 3 0 8 0 lockfpl 104 6006 0 6002 2 1 1 1 0 8 0 lockfspl 48 1507 0 1505 2 1 1 1 0 8 0 sessionpl 112 27 0 16 1 0 1 1 0 8 0 pgrppl 48 27 0 16 1 0 1 1 0 8 0 ucredpl 96 73 0 64 1 0 1 1 0 8 0 zombiepl 144 1750 0 1748 2 1 1 1 0 8 0 processpl 840 1780 0 1748 4 0 4 4 0 8 0 procpl 600 4651 0 4607 4 0 4 4 0 8 0 sockpl 384 103 0 85 3 1 2 3 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 95 0 0 12 0 12 12 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 153 0 0 9 0 9 9 0 8 0 bufpl 256 7502 0 1188 395 0 395 395 0 8 0 anonpl 16 114185 0 111652 19 8 11 13 0 125 0 amapchunkpl 152 8322 0 8226 7 3 4 5 0 158 0 amappl16 192 5883 0 5787 6 1 5 5 0 8 0 amappl15 184 752 0 750 1 0 1 1 0 8 0 amappl14 176 812 0 805 2 1 1 1 0 8 0 amappl12 160 23 0 22 1 0 1 1 0 8 0 amappl11 152 840 0 820 1 0 1 1 0 8 0 amappl10 144 95 0 93 1 0 1 1 0 8 0 amappl9 136 803 0 799 1 0 1 1 0 8 0 amappl8 128 175 0 165 1 0 1 1 0 8 0 amappl7 120 47 0 45 1 0 1 1 0 8 0 amappl6 112 833 0 825 1 0 1 1 0 8 0 amappl5 104 194 0 181 1 0 1 1 0 8 0 amappl4 96 2002 0 1975 2 1 1 2 0 8 0 amappl3 88 246 0 235 1 0 1 1 0 8 0 amappl2 80 13943 0 13864 5 3 2 3 0 8 0 amappl1 72 45802 0 45326 30 20 10 20 0 8 0 amappl 80 4930 0 4891 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1765 0 1748 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1765 0 1748 1 0 1 1 0 8 0 vmmpekpl 168 18492 0 18467 2 0 2 2 0 8 0 vmmpepl 168 158246 0 157071 92 35 57 78 0 357 5 vmsppl 360 1764 0 1748 2 0 2 2 0 8 0 pdppl 4096 3538 0 3496 6 0 6 6 0 8 0 pvpl 32 381210 0 375945 113 24 89 108 0 265 46 pmappl 232 1764 0 1748 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 542 0 4 16 0 16 16 0 8 0