panic: WkeArRNnINeGl : diSaPLg noNOstiTc LaOsWsEeRrEtDi oOnN "SpYg-SC>wALiLr e_25c2o u0nt E=X=IT 0"0 fd aiStopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 13221 59509 32767 0x10 0x4000000 1 syz-executor 269254 93885 32767 0x10 0x4000000 0K syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0xed7c780f5e0, count: 14 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 *cpu0: kernel diagnostic assertion "pg->wire_count == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1326 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xed7c780f5e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c42a180 rbx 0 rdx 0xffff80000143c3c0 rcx 0xffff8000fffec7e8 rax 0x33 r8 0xffff80003c42a0b0 r9 0xffff80003c429f4c r10 0xc43090fb760924d2 r11 0x2c287a66a2829143 r12 0 r13 0 r14 0xffff8000fffec7e8 r15 0 rip 0xffffffff8151d3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c42a100 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=13221 pid=59509 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffec550,0xffffffff838bd2c0 process=0xffff8000fffe9830 user=0xffff80003c425000, vmspace=0xfffffd806cdab3f0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59509 38180 49319 32767 2 0x10 syz-executor *59509 13221 49319 32767 7 0x4000010 syz-executor 44601 18115 547 32767 2 0x10 syz-executor 44601 348800 547 32767 2 0x4000c90 syz-executor 2015 447398 47147 32767 2 0x10 syz-executor 2015 203321 47147 32767 3 0x4000090 fsleep syz-executor 2015 291656 47147 32767 2 0x4000010 syz-executor 2015 520249 47147 32767 3 0x4000090 fsleep syz-executor 15213 168127 93523 32767 2 0x10 syz-executor 15213 175460 93523 32767 3 0x4000090 kqread syz-executor 93885 477640 14589 32767 2 0x10 syz-executor 93885 269254 14589 32767 7 0x4000010 syz-executor 81609 514268 8860 32767 2 0xc90 syz-executor 81609 93065 8860 32767 3 0x4000090 semwait syz-executor 81609 141656 8860 32767 3 0x4000090 fsleep syz-executor 99752 215149 85319 0 3 0x82 sbwait sshd-session 50936 161541 1062 32767 3 0x90 wait syz-executor 547 318191 13753 32767 2 0xc90 syz-executor 14589 35340 66999 32767 2 0xc90 syz-executor 49319 299918 30540 32767 3 0x90 nanoslp syz-executor 8860 195977 96607 32767 2 0xc90 syz-executor 47147 100493 62859 32767 2 0xc90 syz-executor 18376 241162 43897 32767 2 0x10 syz-executor 93523 359066 90218 32767 2 0xc90 syz-executor 62859 310692 752 0 3 0x82 wait syz-executor 13753 421827 752 0 3 0x82 wait syz-executor 66999 196852 752 0 3 0x82 wait syz-executor 96607 441080 752 0 3 0x82 wait syz-executor 1062 106982 752 0 3 0x82 wait syz-executor 43897 416910 752 0 3 0x82 wait syz-executor 90218 88034 752 0 3 0x82 wait syz-executor 30540 320620 752 0 3 0x82 wait syz-executor 752 468526 77850 0 3 0x82 kqread syz-executor 77850 137790 46365 0 3 0x10008a sigsusp ksh 46365 276670 2166 0 3 0x98 kqread sshd-session 2166 107477 85319 0 3 0x92 kqread sshd-session 74519 234941 1 0 3 0x100083 ttyin getty 85319 144821 1 0 3 0x88 kqread sshd 8003 400381 84838 73 3 0x1100090 kqread syslogd 84838 189853 1 0 3 0x100082 sbwait syslogd 83543 164103 1 0 3 0x100080 kqread resolvd 83076 61938 73785 77 3 0x100092 kqread dhcpleased 3134 62090 73785 77 3 0x100092 kqread dhcpleased 73785 450411 1 0 3 0x80 kqread dhcpleased 46432 36756 0 0 3 0x14200 bored smr 86775 427989 0 0 2 0x14200 zerothread 76879 98111 0 0 3 0x14200 aiodoned aiodoned 43804 512552 0 0 3 0x14200 syncer update 91245 421673 0 0 3 0x14200 cleaner cleaner 17684 46522 0 0 3 0x14200 reaper reaper 46866 440797 0 0 3 0x14200 pgdaemon pagedaemon 24938 64642 0 0 3 0x14200 bored viomb 42117 274897 0 0 3 0x40014200 acpi0 acpi0 56302 89145 0 0 3 0x40014200 idle1 92206 394715 0 0 3 0x14200 bored softnet1 1668 473024 0 0 2 0x14200 softnet0 19279 213660 0 0 3 0x14200 bored systqmp 5968 19545 0 0 3 0x14200 bored systq 70024 98695 0 0 3 0x14200 tmoslp softclockmp 47429 375793 0 0 3 0x40014200 tmoslp softclock 96902 353737 0 0 3 0x40014200 idle0 1 41908 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff839e4168) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 uvn_flush+0x1e7 sys/uvm/uvm_vnode.c:-1 #3 uvn_detach+0xcf sys/uvm/uvm_vnode.c:344 #4 uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 #5 uvm_mapanon+0x85d sys/uvm/uvm_map.c:910 #6 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 #7 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 CPU 1: exclusive mutex &kq->kq_lock r = 0 (0xfffffd8077212e10) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 kqueue_register+0xda6 sys/kern/kern_event.c:1519 #3 ppollregister_evts+0xca sys/kern/sys_generic.c:1044 #4 ppollregister+0x32f sys/kern/sys_generic.c:1142 #5 doppoll+0x214 sys/kern/sys_generic.c:959 #6 sys_poll+0xd8 sys/kern/sys_generic.c:-1 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 Process 93885 (syz-executor) thread 0xffff8000fffeca80 (269254) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a129c8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 uvn_detach+0x7e sys/uvm/uvm_vnode.c:-1 #2 uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 #3 uvm_mapanon+0x85d sys/uvm/uvm_map.c:910 #4 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 #5 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 exclusive rwlock uobjlk r = 0 (0xfffffd806c78a308) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 uvn_detach+0x30 sys/uvm/uvm_vnode.c:293 #3 uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 #4 uvm_mapanon+0x85d sys/uvm/uvm_map.c:910 #5 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 #6 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 10961K 10973K 166960K 11306 0 pcb 17 12K 12K 166960K 17 0 rtable 243 6K 7K 166960K 371 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 4 1K 9K 166960K 9 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 24K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1337 84K 84K 166960K 1377 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 13 0K 0K 166960K 116 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 125K 166960K 398 0 sigio 0 0K 0K 166960K 7 0 proc 58 99K 180K 166960K 494 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 90 0 in_multi 99 7K 7K 166960K 106 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 217 970K 970K 166960K 217 0 exec 0 0K 1K 166960K 392 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 272 185K 194K 166960K 5370 0 UVM aobj 106 3K 5K 166960K 107 0 pinsyscall 48 96K 110K 166960K 1466 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 13 0 NDP 11 0K 2K 166960K 27 0 temp 48 8673K 8737K 166960K 4976 0 kqueue 14 22K 29K 166960K 67 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 58 0 55 1 0 1 1 0 8 0 rtentry 176 116 0 3 6 0 6 6 0 8 0 unpcb 144 215 0 195 2 0 2 2 0 8 1 syncache 336 10 0 10 1 0 1 1 0 8 1 tcpqe 32 5 0 5 1 0 1 1 0 8 1 tcpcb 736 293 0 281 7 0 7 7 0 8 5 arp 136 19 0 0 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 3 0 2 1 0 1 1 0 8 0 inpcb 328 521 0 504 7 0 7 7 0 8 5 ip6q 72 3 0 1 1 0 1 1 0 8 0 ip6af 40 5 0 3 1 0 1 1 0 8 0 nd6 152 28 0 2 2 0 2 2 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 477 0 11 30 0 30 30 0 8 0 art_table 40 478 0 11 5 0 5 5 0 8 0 art_node 32 116 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 10 1 0 1 1 0 8 0 semapl 112 48 0 38 1 0 1 1 0 8 0 shmpl 112 104 0 1 3 0 3 3 0 8 0 dirhash 1024 22 0 5 3 0 3 3 0 8 0 dino2pl 256 1929 0 419 95 0 95 95 0 8 0 ffsino 296 1929 0 419 117 0 117 117 0 8 0 nchpl 144 2494 0 806 63 0 63 63 0 8 0 vnodes 216 2010 0 0 112 0 112 112 0 8 0 namei 1024 7953 0 7953 1 0 1 1 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 8707 0 8707 5 2 3 3 1 8 3 plimitpl 152 167 0 141 2 0 2 2 0 8 0 sigapl 424 684 0 630 7 0 7 7 0 8 0 knotepl 120 438 0 0 14 0 14 14 0 8 0 kqueuepl 224 168 0 157 5 0 5 5 0 8 4 pipepl 344 141 0 114 3 0 3 3 0 8 0 fdescpl 528 668 0 630 4 0 4 4 0 8 0 filepl 160 3412 0 3182 15 1 14 14 0 8 4 lockfpl 104 92 0 88 1 0 1 1 0 8 0 lockfspl 48 31 0 27 1 0 1 1 0 8 0 sessionpl 144 27 0 10 1 0 1 1 0 8 0 pgrppl 48 39 0 14 1 0 1 1 0 8 0 ucredpl 104 567 0 548 1 0 1 1 0 8 0 zombiepl 144 631 0 630 1 0 1 1 0 8 0 processpl 1232 684 0 630 5 0 5 5 0 8 0 procpl 664 1142 0 1079 6 0 6 6 0 8 0 sockpl 752 800 0 760 11 0 11 11 0 8 6 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k 2048 33 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 221 0 0 14 0 14 14 0 8 0 bufpl 280 2868 0 119 197 0 197 197 0 8 0 anonpl 32 8938 0 0 73 0 73 73 0 246 0 amapchunkpl 152 17651 0 17005 32 0 32 32 0 158 3 amappl16 200 2506 0 2483 16 4 12 14 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 7 0 7 1 1 0 1 0 8 0 amappl13 176 409 0 408 1 0 1 1 0 8 0 amappl12 168 1013 0 965 3 0 3 3 0 8 0 amappl11 160 8 0 7 1 0 1 1 0 8 0 amappl10 152 48 0 38 1 0 1 1 0 8 0 amappl9 144 248 0 248 1 1 0 1 0 8 0 amappl8 136 21 0 20 1 0 1 1 0 8 0 amappl7 128 74 0 73 1 0 1 1 0 8 0 amappl6 120 274 0 261 1 0 1 1 0 8 0 amappl5 112 79 0 70 1 0 1 1 0 8 0 amappl4 104 395 0 370 1 0 1 1 0 8 0 amappl3 96 3033 0 2903 4 0 4 4 0 8 0 amappl2 88 560 0 497 2 0 2 2 0 8 0 amappl1 80 11243 0 10586 16 0 16 16 0 8 0 amappl 88 4622 0 4428 5 0 5 5 0 92 0 uvmvnodes 80 109 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 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 72 106 0 1 2 0 2 2 0 8 0 uaddrrnd 24 668 0 630 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 668 0 630 1 0 1 1 0 8 0 vmmpekpl 168 7443 0 7414 2 0 2 2 0 8 0 vmmpepl 168 51948 0 49737 112 0 112 112 0 357 7 vmsppl 488 667 0 630 7 1 6 6 0 8 0 rwobjpl 80 17868 0 16699 31 0 31 31 0 8 0 pdppl 4096 1344 0 1260 110 22 88 98 0 8 4 pvpl 32 17146 0 0 139 0 139 139 0 265 0 pmappl 256 667 0 630 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 296 0 25 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837cfff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,69) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,69) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(69) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(69) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff833879ad) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff833b03e7) at panic+0x103 sys/kern/subr_prf.c:217 __assert(ffffffff833f1046,ffffffff8333fc7a,52e,ffffffff834071a1) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd8008011fb0) at uvm_pagedequeue+0x2dd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd806c0274c0,0,0,19) at uvn_flush+0x4fc sys/uvm/uvm_vnode.c:683 uvn_detach(fffffd806c0274c0) at uvn_detach+0xcf sys/uvm/uvm_vnode.c:344 end trace frame: 0xffff8000393f3cd0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837cfff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,69) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,69) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(69) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(69) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff833879ad) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff833b03e7) at panic+0x103 sys/kern/subr_prf.c:217 __assert(ffffffff833f1046,ffffffff8333fc7a,52e,ffffffff834071a1) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd8008011fb0) at uvm_pagedequeue+0x2dd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd806c0274c0,0,0,19) at uvn_flush+0x4fc sys/uvm/uvm_vnode.c:683 uvn_detach(fffffd806c0274c0) at uvn_detach+0xcf sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff8000393f3cf0,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_mapanon(fffffd806ca3bba0,ffff8000393f3f18,400000,0,3090713) at uvm_mapanon+0x85d sys/uvm/uvm_map.c:910 uvm_mmapanon(fffffd806ca3bba0,ffff8000393f3f18,400000,3,7,5012,86cc6f4c2f55a449,fffffd806ca3bba0) at uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff8000fffeca80,ffff8000393f4080,ffff8000393f3fd0) at sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 syscall(ffff8000393f4080) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000393f4080) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x52aab6020c0, count: -20 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0xed7c780f5e0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xed7c780f5e0, count: -1