login: panic: mtx 0xffffffff821ae640: locking against myself Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 379694 1843 0 0x2 0 0K syz-executor1308 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __mtx_enter_try(ffffffff821ae640) at __mtx_enter_try+0x131 sys/kern/kern_lock.c:297 _mtx_enter(ffffffff821ae640,ffffffff81fb85c6,1ff) at _mtx_enter+0x54 __mtx_enter sys/kern/kern_lock.c:267 [inline] _mtx_enter(ffffffff821ae640,ffffffff81fb85c6,1ff) at _mtx_enter+0x54 sys/kern/kern_lock.c:447 printf(ffffffff81fcd105) at printf+0x6b sys/kern/subr_prf.c:511 splassert_fail(d,e,ffffffff81fb0566) at splassert_fail+0x67 sys/kern/subr_prf.c:223 witness_lock(ffffffff823c2350,8,ffffffff81fa3cf4,1bc) at witness_lock+0x423 witness_lock_stack_get sys/kern/subr_witness.c:1880 [inline] witness_lock(ffffffff823c2350,8,ffffffff81fa3cf4,1bc) at witness_lock+0x423 sys/kern/subr_witness.c:1199 wakeup_n(ffff800000970a88,ffffffff) at wakeup_n+0x43 sys/kern/kern_synch.c:444 tputchar(73,ffff800000970a00) at tputchar+0xf5 ttstart sys/kern/tty.c:1341 [inline] tputchar(73,ffff800000970a00) at tputchar+0xf5 sys/kern/tty.c:2277 kputchar(73,5,0) at kputchar+0xe6 sys/kern/subr_prf.c:342 kprintf() at kprintf+0x1b2c sys/kern/subr_prf.c:1058 printf(ffffffff81f68c1b) at printf+0x80 sys/kern/subr_prf.c:512 start_vmm_on_cpu(ffff800020aa0ff0) at start_vmm_on_cpu+0x165 sys/arch/amd64/amd64/vmm.c:922 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 end trace frame: 0xffff800020add420, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic mtx 0xffffffff821ae640: locking against myself ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __mtx_enter_try(ffffffff821ae640) at __mtx_enter_try+0x131 sys/kern/kern_lock.c:297 _mtx_enter(ffffffff821ae640,ffffffff81fb85c6,1ff) at _mtx_enter+0x54 __mtx_enter sys/kern/kern_lock.c:267 [inline] _mtx_enter(ffffffff821ae640,ffffffff81fb85c6,1ff) at _mtx_enter+0x54 sys/kern/kern_lock.c:447 printf(ffffffff81fcd105) at printf+0x6b sys/kern/subr_prf.c:511 splassert_fail(d,e,ffffffff81fb0566) at splassert_fail+0x67 sys/kern/subr_prf.c:223 witness_lock(ffffffff823c2350,8,ffffffff81fa3cf4,1bc) at witness_lock+0x423 witness_lock_stack_get sys/kern/subr_witness.c:1880 [inline] witness_lock(ffffffff823c2350,8,ffffffff81fa3cf4,1bc) at witness_lock+0x423 sys/kern/subr_witness.c:1199 wakeup_n(ffff800000970a88,ffffffff) at wakeup_n+0x43 sys/kern/kern_synch.c:444 tputchar(73,ffff800000970a00) at tputchar+0xf5 ttstart sys/kern/tty.c:1341 [inline] tputchar(73,ffff800000970a00) at tputchar+0xf5 sys/kern/tty.c:2277 kputchar(73,5,0) at kputchar+0xe6 sys/kern/subr_prf.c:342 kprintf() at kprintf+0x1b2c sys/kern/subr_prf.c:1058 printf(ffffffff81f68c1b) at printf+0x80 sys/kern/subr_prf.c:512 start_vmm_on_cpu(ffff800020aa0ff0) at start_vmm_on_cpu+0x165 sys/arch/amd64/amd64/vmm.c:922 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi(0,3,1388,0,0,ffff80000001db00) at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x301 sys/dev/acpi/acpicpu.c:1187 sched_idle(ffff800020aa0ff0) at sched_idle+0x422 sys/kern/kern_sched.c:181 end trace frame: 0x0, count: -17 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020adcda0 rbx 0xffff800020adce50 rdx 0xffffffff81fb85c6 apollo_pio_rec+0x7a19 rcx 0x201 rax 0x1 r8 0xffffffff8100f603 kprintf+0x173 r9 0x1 r10 0xca0962e79a982b18 r11 0xaa5d3a25fb8dff8c r12 0x3000000008 r13 0xffff800020adcdb0 r14 0x100 r15 0x1 rip 0xffffffff81cdc368 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020adcd90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (idle1) pid=136800 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0x65486e589328cc26, list=0xffff800020ab0e10,0xffff800020ab0010 process=0xffff800020ab33b0 user=0xffff800020ad8000, vmspace=0xffffffff8236e8e8 estcpu=0, cpticks=3043, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 1843 379694 67005 0 7 0x2 syz-executor1308 67005 140859 46819 0 3 0x10008a pause ksh 46819 163666 99561 0 3 0x92 select sshd 27917 137465 1 0 3 0x100083 ttyin getty 99561 250835 1 0 3 0x80 select sshd 35446 468839 99376 74 3 0x100092 bpf pflogd 99376 98313 1 0 3 0x80 netio pflogd 61015 84409 44635 73 3 0x100090 kqread syslogd 44635 340294 1 0 3 0x100082 netio syslogd 83561 242693 1 77 3 0x100090 poll dhclient 69512 412288 1 0 3 0x80 poll dhclient 29589 104735 0 0 3 0x14200 pgzero zerothread 75168 460541 0 0 3 0x14200 aiodoned aiodoned 71879 31311 0 0 3 0x14200 syncer update 47530 12707 0 0 3 0x14200 cleaner cleaner 50205 350331 0 0 3 0x14200 reaper reaper 85643 226705 0 0 3 0x14200 pgdaemon pagedaemon 34387 19927 0 0 3 0x14200 bored crynlk 27256 61234 0 0 3 0x14200 bored crypto 50166 375141 0 0 3 0x40014200 acpi0 acpi0 *26904 136800 0 0 7 0x40014200 idle1 6891 302887 0 0 3 0x14200 bored softnet 33217 19750 0 0 3 0x14200 bored systqmp 38364 399393 0 0 3 0x14200 bored systq 90129 36432 0 0 3 0x40014200 bored softclock 88405 346170 0 0 3 0x40014200 idle0 39799 224024 0 0 3 0x14200 bored smr 1 229434 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff823c2350) locked @ /syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c:444 Process 1843 (syz-executor1308) thread 0xffff800020b75078 (379694) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8236d9f8) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x5a4 sys/kern/subr_witness.c:1201 #1 syscall+0x45e mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x45e sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9451 6382K 6383K 78643K 10538 0 0 pcb 25 9K 9K 78643K 57 0 0 rtable 61 2K 2K 78643K 125 0 0 ifaddr 25 7K 7K 78643K 26 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 1 2K 4K 78643K 1468 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1169 73K 73K 78643K 1174 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 2 2K 3K 78643K 4 0 0 proc 52 50K 58K 78643K 279 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 24 106K 106K 78643K 24 0 0 exec 0 0K 1K 78643K 179 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 53 3K 3K 78643K 764 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 4 0K 0K 78643K 4 0 0 temp 39 2692K 2756K 78643K 1995 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 29 0 23 1 0 1 1 0 8 0 plimitpl 152 14 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 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 8 0 0 1 0 1 1 0 8 0 pfstkey 112 8 0 0 1 0 1 1 0 8 0 pfstate 328 8 0 0 1 0 1 1 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 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 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1393 0 18 45 0 45 45 0 8 0 ffsino 272 1393 0 18 92 0 92 92 0 8 0 nchpl 144 1566 0 33 57 0 57 57 0 8 0 uvmvnodes 72 1403 0 0 26 0 26 26 0 8 0 vnodes 200 1403 0 0 74 0 74 74 0 8 0 namei 1024 3556 0 3556 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2311 0 2311 2 1 1 2 0 8 1 sigapl 432 205 0 193 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 112 134 0 127 2 1 1 1 0 8 0 fdescpl 488 206 0 193 3 0 3 3 0 8 0 filepl 152 964 0 914 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 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 55 0 46 1 0 1 1 0 8 0 zombiepl 144 193 0 193 2 1 1 1 0 8 1 processpl 840 221 0 193 4 0 4 4 0 8 0 procpl 600 221 0 193 3 0 3 3 0 8 0 sockpl 384 73 0 55 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 67 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 84 0 0 6 0 6 6 0 8 0 bufpl 256 2133 0 271 117 0 117 117 0 8 0 anonpl 16 19041 0 17839 8 2 6 7 0 125 1 amapchunkpl 152 554 0 517 2 0 2 2 0 158 0 amappl16 192 89 0 83 1 0 1 1 0 8 0 amappl14 176 16 0 15 2 1 1 1 0 8 0 amappl12 160 3 0 3 1 0 1 1 0 8 1 amappl11 152 46 0 28 1 0 1 1 0 8 0 amappl10 144 55 0 53 1 0 1 1 0 8 0 amappl9 136 422 0 421 1 0 1 1 0 8 0 amappl8 128 97 0 93 1 0 1 1 0 8 0 amappl7 120 21 0 20 1 0 1 1 0 8 0 amappl6 112 47 0 42 1 0 1 1 0 8 0 amappl5 104 116 0 102 1 0 1 1 0 8 0 amappl4 96 446 0 420 1 0 1 1 0 8 0 amappl3 88 105 0 100 1 0 1 1 0 8 0 amappl2 80 598 0 558 1 0 1 1 0 8 0 amappl1 72 13551 0 13135 15 5 10 15 0 8 0 amappl 72 427 0 406 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 24 206 0 193 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 206 0 193 1 0 1 1 0 8 0 vmmpekpl 168 5609 0 5588 2 0 2 2 0 8 0 vmmpepl 168 27138 0 26382 46 9 37 46 0 357 2 vmsppl 360 205 0 193 2 0 2 2 0 8 0 pdppl 4096 420 0 386 6 0 6 6 0 8 0 pvpl 32 80161 0 77225 31 3 28 28 0 265 3 pmappl 232 205 0 193 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 247 0 3 7 0 7 7 0 8 0 ddb{1}>