panic: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/main/kernel/sys/arch/amd64/amd64/intr.c", line 706 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *247201 2629 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82885f6d) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff829092f8,ffffffff8289f9c3,2c2,ffffffff82885576) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(dfa1166a) at splraise+0xa9 sys/arch/amd64/amd64/intr.c:706 mtx_enter(fffffd8065400880) at mtx_enter+0x73 sys/kern/kern_lock.c:333 pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 rcr3 machine/cpufunc.h:141 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:425 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 sys/arch/amd64/amd64/pmap.c:1950 uvm_anfree_list(fffffd8064680858,ffff80002a5c5be8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806bc35ec8) at amap_wipeout+0x1c1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5c5cb0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1366 uvm_map_teardown(fffffd807f01b6e0) at uvm_map_teardown+0x28f sys/uvm/uvm_map.c:2587 uvmspace_free(fffffd807f01b6e0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3497 reaper(ffff80002a5c7a98) at reaper+0x15d sys/kern/kern_exit.c:463 end trace frame: 0x0, count: 3 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 *cpu0: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/main/kernel/sys/arch/amd64/amd64/intr.c", line 706 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82885f6d) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff829092f8,ffffffff8289f9c3,2c2,ffffffff82885576) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(dfa1166a) at splraise+0xa9 sys/arch/amd64/amd64/intr.c:706 mtx_enter(fffffd8065400880) at mtx_enter+0x73 sys/kern/kern_lock.c:333 pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 rcr3 machine/cpufunc.h:141 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:425 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 sys/arch/amd64/amd64/pmap.c:1950 uvm_anfree_list(fffffd8064680858,ffff80002a5c5be8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806bc35ec8) at amap_wipeout+0x1c1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5c5cb0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1366 uvm_map_teardown(fffffd807f01b6e0) at uvm_map_teardown+0x28f sys/uvm/uvm_map.c:2587 uvmspace_free(fffffd807f01b6e0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3497 reaper(ffff80002a5c7a98) at reaper+0x15d sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a5c59b0 rbx 0x1 rdx 0 rcx 0 rax 0xffff80002a5c7a98 r8 0 r9 0x8080808080808080 r10 0x41e13b39cefef02f r11 0x593947651dd27492 r12 0 r13 0xfffffd80068106e8 r14 0 r15 0x1 rip 0xffffffff81061a4c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002a5c59a0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (reaper) tid=247201 pid=2629 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=4, usrpri=50, slppri=4, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a57dd38,0xffff80002a5c72b0 process=0xffff8000fffff240 user=0xffff80002a5c0000, vmspace=0xffffffff82e440a8 estcpu=0, cpticks=1, pctcpu=0.1, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 20972 278732 70567 0 3 0x80 fsleep syz-executor.7 20972 27863 70567 0 3 0x4000080 netio syz-executor.7 20972 349494 70567 0 3 0x4000080 fsleep syz-executor.7 20972 24734 70567 0 3 0x4000080 fsleep syz-executor.7 65626 408492 61061 60928 3 0x90 fsleep syz-executor.0 65626 69806 61061 60928 3 0x4000090 fsleep syz-executor.0 65626 126764 61061 60928 3 0x4000090 fsleep syz-executor.0 65626 215135 61061 60928 3 0x4000090 fifor syz-executor.0 43178 491884 78386 0 2 0x2 syz-executor.5 15367 186179 1 0 3 0x100083 ttyin getty 59319 519736 78386 0 2 0x482 syz-executor.2 55946 491330 78386 0 2 0x482 syz-executor.4 68054 52249 78386 0 2 0x482 syz-executor.6 34514 409775 78386 0 2 0x2 syz-executor.3 70567 129865 78386 0 2 0x482 syz-executor.7 22744 172885 0 0 3 0x14200 acct acct 98805 446420 1 0 3 0x80 fsleep syz-executor.4 98805 439429 1 0 3 0x4000080 netio syz-executor.4 45176 241534 0 0 3 0x14200 bored sosplice 61061 401291 78386 0 3 0x82 nanoslp syz-executor.0 78386 289412 4099 0 3 0x2000082 wait syz-fuzzer 78386 387859 4099 0 3 0x6000082 nanoslp syz-fuzzer 78386 250958 4099 0 3 0x6000082 thrsleep syz-fuzzer 78386 255435 4099 0 3 0x6000082 wait syz-fuzzer 78386 458942 4099 0 2 0x6000002 syz-fuzzer 78386 372069 4099 0 3 0x6000082 wait syz-fuzzer 78386 247814 4099 0 3 0x6000082 thrsleep syz-fuzzer 78386 182877 4099 0 3 0x6000082 wait syz-fuzzer 78386 218025 4099 0 3 0x6000082 wait syz-fuzzer 78386 15382 4099 0 3 0x6000082 thrsleep syz-fuzzer 78386 378167 4099 0 3 0x6000082 wait syz-fuzzer 78386 339236 4099 0 3 0x6000082 wait syz-fuzzer 78386 246371 4099 0 3 0x6000082 wait syz-fuzzer 78386 76422 4099 0 3 0x6000082 thrsleep syz-fuzzer 4099 60367 44352 0 3 0x10008a sigsusp ksh 44352 162625 93292 0 2 0x12 sshd 93292 26485 1 0 3 0x88 kqread sshd 20 22625 25273 73 3 0x1100090 kqread syslogd 25273 499845 1 0 3 0x100082 netio syslogd 72253 321266 1 0 3 0x100080 kqread resolvd 28222 305502 93491 77 3 0x100092 kqread dhcpleased 57916 78028 93491 77 3 0x100092 kqread dhcpleased 93491 330814 1 0 3 0x80 kqread dhcpleased 65872 123541 0 0 3 0x14200 bored smr 46954 410129 0 0 2 0x14200 zerothread 50605 486086 0 0 3 0x14200 aiodoned aiodoned 36760 41322 0 0 3 0x14200 syncer update 2234 191046 0 0 3 0x14200 cleaner cleaner * 2629 247201 0 0 7 0x14200 reaper 83543 463495 0 0 3 0x14200 pgdaemon pagedaemon 9467 25204 0 0 3 0x14200 bored viomb 41010 170653 0 0 3 0x40014200 acpi0 acpi0 47739 448919 0 0 3 0x14200 bored softnet3 89536 231735 0 0 3 0x14200 bored softnet2 86729 74289 0 0 3 0x14200 bored softnet1 73651 475485 0 0 2 0x14200 softnet0 30293 398586 0 0 3 0x14200 bored systqmp 80078 282621 0 0 3 0x14200 bored systq 28785 415923 0 0 3 0x40014200 tmoslp softclock 85173 216516 0 0 3 0x40014200 idle0 1 338886 0 0 3 0x80082 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 10207 6430K 8552K 166960K 57302 0 pcb 15 14K 16K 166960K 967 0 rtable 196 14K 15K 166960K 3468 0 pf 31 9K 9K 166960K 140 0 ifaddr 42 11K 11K 166960K 148 0 ifgroup 54 2K 2K 166960K 241 0 sysctl 3 0K 0K 166960K 5 0 counters 31 17K 17K 166960K 80 0 ioctlops 0 0K 2K 166960K 4998 0 iov 0 0K 32K 166960K 1214 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1658 104K 104K 166960K 21785 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 1127 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 15 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 12 41K 73K 166960K 35563 0 sigio 0 0K 0K 166960K 1257 0 proc 63 59K 75K 166960K 1219 0 subproc 104 6K 8K 166960K 388 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 913 0 in_multi 77 5K 7K 166960K 303 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 2070 0 pfkey data 0 0K 4K 166960K 47 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 383 164K 172K 166960K 339681 0 UVM aobj 131 4K 4K 166960K 151 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 275 0 NDP 12 0K 2K 166960K 105 0 temp 78 6764K 7076K 166960K 133037 0 kqueue 12 18K 28K 166960K 2750 0 SYN cache 2 104K 112K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 496 0 493 3 0 3 3 0 8 2 rtentry 112 1354 0 1266 4 0 4 4 0 8 1 unpcb 144 13854 0 13835 11 2 9 11 0 8 8 syncache 336 71 0 71 2 1 1 1 0 8 1 tcpqe 32 163 0 163 2 1 1 1 0 8 1 tcpcb 808 4357 0 4348 8 0 8 8 0 8 6 arp 88 402 0 388 1 0 1 1 0 8 0 ipq 40 7 0 7 2 1 1 1 0 8 1 ipqe 40 15 0 15 2 1 1 1 0 8 1 inpcb 360 22280 0 22268 18 9 9 13 0 8 7 nd6 104 71 0 53 1 0 1 1 0 8 0 pkpcb 40 199 0 199 1 0 1 1 0 8 1 kcovpl 48 29 0 21 1 0 1 1 0 8 0 ppxss 1072 10 0 10 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3277 0 2906 34 10 24 30 0 8 0 art_table 32 3278 0 2906 4 0 4 4 0 8 1 art_node 16 1341 0 1261 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 0 1 0 1 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 148 0 20 4 0 4 4 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 42671 0 41224 91 0 91 91 0 8 0 ffsino 240 42671 0 41224 86 0 86 86 0 8 0 nchpl 144 88225 0 86576 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 249049 0 249049 4 2 2 3 0 8 2 vcpupl 2048 26 0 5 3 0 3 3 0 8 0 vmpool 664 26 0 5 2 0 2 2 0 8 0 kstatmem 264 122 0 98 2 0 2 2 0 8 0 scxspl 216 231506 0 231506 11 7 4 8 1 8 4 plimitpl 152 343 0 327 1 0 1 1 0 8 0 sigapl 424 35924 0 35879 8 0 8 8 0 8 2 futexpl 64 237038 0 237031 1 0 1 1 0 8 0 knotepl 120 270579 0 270496 28 17 11 18 0 8 8 kqueuepl 184 7478 0 7469 7 0 7 7 0 8 6 pipepl 288 4111 0 4082 11 0 11 11 0 8 8 fdescpl 432 35806 0 35783 4 0 4 4 0 8 0 filepl 120 160607 0 160369 17 0 17 17 0 8 8 lockfpl 104 6084 0 6082 2 0 2 2 0 8 1 lockfspl 48 2209 0 2207 1 0 1 1 0 8 0 sessionpl 144 41 0 24 1 0 1 1 0 8 0 pgrppl 48 478 0 461 1 0 1 1 0 8 0 ucredpl 104 20933 0 20918 1 0 1 1 0 8 0 zombiepl 144 35883 0 35879 1 0 1 1 0 8 0 processpl 1072 35924 0 35879 5 0 5 5 0 8 0 procpl 680 96464 0 96399 9 0 9 9 0 8 2 sosppl 168 90 0 90 2 1 1 1 0 8 1 sockpl 488 36836 0 36802 329 315 14 36 0 8 8 mcl64k 65536 770 0 770 2 1 1 1 0 8 1 mcl16k 16384 278 0 278 2 1 1 1 0 8 1 mcl12k 12288 889 0 889 2 1 1 1 0 8 1 mcl9k 9216 403 0 403 1 0 1 1 0 8 1 mcl8k 8192 1062 0 1062 10 2 8 9 0 8 8 mcl4k 4096 2772 0 2772 2 1 1 1 0 8 1 mcl2k2 2112 203 0 203 2 1 1 1 0 8 1 mcl2k 2048 107078 0 107035 50 37 13 28 0 8 6 mtagpl 96 2516 0 2404 21 13 8 21 0 8 5 mbufpl 256 355741 0 354767 505 431 74 273 0 8 7 bufpl 280 43130 0 36738 457 0 457 457 0 8 0 anonpl 24 2752596 0 2740521 108 6 102 102 0 188 18 amapchunkpl 152 1065452 0 1064711 41 4 37 37 0 158 4 amappl16 200 45643 0 45252 72 41 31 34 0 8 8 amappl15 192 58 0 57 1 0 1 1 0 8 0 amappl14 184 205 0 192 2 1 1 2 0 8 0 amappl13 176 68 0 65 1 0 1 1 0 8 0 amappl12 168 36683 0 36656 2 0 2 2 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 46 0 35 1 0 1 1 0 8 0 amappl9 144 225 0 225 2 1 1 1 0 8 1 amappl8 136 730 0 621 4 0 4 4 0 8 0 amappl7 128 278 0 254 2 0 2 2 0 8 0 amappl6 120 587 0 577 1 0 1 1 0 8 0 amappl5 112 526 0 518 1 0 1 1 0 8 0 amappl4 104 736 0 716 2 1 1 2 0 8 0 amappl3 96 212133 0 212047 4 0 4 4 0 8 1 amappl2 88 36993 0 36918 3 1 2 3 0 8 0 amappl1 80 132309 0 131797 22 10 12 22 0 8 0 amappl 88 338817 0 338610 7 0 7 7 0 92 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 72 150 0 20 3 0 3 3 0 8 0 uaddrrnd 24 35832 0 35788 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 35832 0 35788 1 0 1 1 0 8 0 vmmpekpl 168 235321 0 235247 4 0 4 4 0 8 0 vmmpepl 168 2016014 0 2013905 146 20 126 126 0 357 19 vmsppl 352 35831 0 35787 5 0 5 5 0 8 0 rwobjpl 24 454186 0 446665 48 0 48 48 0 8 1 pdppl 4096 71670 0 71595 2462 2377 85 85 0 8 10 pvpl 32 8284881 0 8267466 422 233 189 362 0 265 34 pmappl 216 35831 0 35787 3 0 3 3 0 8 0 pool(pmappl): free list modified: page 0xfffffd8065400000; item ordinal 3; addr 0xfffffd8065400880 (p 0xfffffd8065400000); offset 0x1c=0xdeadbef0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 3288 0 2865 19 1 18 18 0 8 1 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82885f6d) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff829092f8,ffffffff8289f9c3,2c2,ffffffff82885576) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(dfa1166a) at splraise+0xa9 sys/arch/amd64/amd64/intr.c:706 mtx_enter(fffffd8065400880) at mtx_enter+0x73 sys/kern/kern_lock.c:333 pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 rcr3 machine/cpufunc.h:141 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:425 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 sys/arch/amd64/amd64/pmap.c:1950 uvm_anfree_list(fffffd8064680858,ffff80002a5c5be8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806bc35ec8) at amap_wipeout+0x1c1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5c5cb0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1366 uvm_map_teardown(fffffd807f01b6e0) at uvm_map_teardown+0x28f sys/uvm/uvm_map.c:2587 uvmspace_free(fffffd807f01b6e0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3497 reaper(ffff80002a5c7a98) at reaper+0x15d sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82885f6d) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff829092f8,ffffffff8289f9c3,2c2,ffffffff82885576) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(dfa1166a) at splraise+0xa9 sys/arch/amd64/amd64/intr.c:706 mtx_enter(fffffd8065400880) at mtx_enter+0x73 sys/kern/kern_lock.c:333 pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 rcr3 machine/cpufunc.h:141 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:425 [inline] pmap_page_remove(fffffd8006810680) at pmap_page_remove+0xa3 sys/arch/amd64/amd64/pmap.c:1950 uvm_anfree_list(fffffd8064680858,ffff80002a5c5be8) at uvm_anfree_list+0x98 amap_wipeout(fffffd806bc35ec8) at amap_wipeout+0x1c1 sys/uvm/uvm_amap.c:504 uvm_unmap_detach(ffff80002a5c5cb0,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1366 uvm_map_teardown(fffffd807f01b6e0) at uvm_map_teardown+0x28f sys/uvm/uvm_map.c:2587 uvmspace_free(fffffd807f01b6e0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3497 reaper(ffff80002a5c7a98) at reaper+0x15d sys/kern/kern_exit.c:463 end trace frame: 0x0, count: -12