panic: kernel diagnostic assertion "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/main/kernel/sys/arch/amd64/amd64/intr.c", line 775 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *268140 26056 0 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b7685) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8306a957,ffffffff8306a6a0,307,ffffffff830251d7) at __assert+0x29 splraise(deadbeef) at splraise+0xad sys/arch/amd64/amd64/intr.c:775 mtx_enter(ffff8000012d8008) at mtx_enter+0x9e sys/kern/kern_lock.c:308 klist_mutex_lock(ffff8000012d8008) at klist_mutex_lock+0x32 sys/kern/kern_event.c:2352 klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 klist_lock sys/kern/kern_event.c:2317 [inline] klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 sys/kern/kern_event.c:2283 bpfsdetach(ffff800001286fc0) at bpfsdetach+0xff sys/net/bpf.c:1800 bpfdetach(ffff80000128c800) at bpfdetach+0x76 if_detach(ffff80000128c800) at if_detach+0x14f sys/net/if.c:1193 tun_clone_destroy(ffff80000128c800) at tun_clone_destroy+0x2aa sys/net/if_tun.c:338 if_clone_destroy(ffff80003770d650) at if_clone_destroy+0x1d7 sys/net/if.c:1382 sys_ioctl(ffff800035c0c028,ffff80003770d830,ffff80003770d780) at sys_ioctl+0x678 syscall(ffff80003770d830) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 end trace frame: 0xffff80003770d8b0, 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> 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 775 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b7685) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8306a957,ffffffff8306a6a0,307,ffffffff830251d7) at __assert+0x29 splraise(deadbeef) at splraise+0xad sys/arch/amd64/amd64/intr.c:775 mtx_enter(ffff8000012d8008) at mtx_enter+0x9e sys/kern/kern_lock.c:308 klist_mutex_lock(ffff8000012d8008) at klist_mutex_lock+0x32 sys/kern/kern_event.c:2352 klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 klist_lock sys/kern/kern_event.c:2317 [inline] klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 sys/kern/kern_event.c:2283 bpfsdetach(ffff800001286fc0) at bpfsdetach+0xff sys/net/bpf.c:1800 bpfdetach(ffff80000128c800) at bpfdetach+0x76 if_detach(ffff80000128c800) at if_detach+0x14f sys/net/if.c:1193 tun_clone_destroy(ffff80000128c800) at tun_clone_destroy+0x2aa sys/net/if_tun.c:338 if_clone_destroy(ffff80003770d650) at if_clone_destroy+0x1d7 sys/net/if.c:1382 sys_ioctl(ffff800035c0c028,ffff80003770d830,ffff80003770d780) at sys_ioctl+0x678 syscall(ffff80003770d830) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa065a63c0, count: -15 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003770d2f0 rbx 0xffffffff834a2630 cdevsw+0x730 rdx 0xffff80000125d440 rcx 0 rax 0xffff800035c0c028 r8 0 r9 0x8080808080808080 r10 0xa1b1e9ee14ce0433 r11 0xcccde5454ad51c04 r12 0 r13 0xffff8000012d80a8 r14 0 r15 0x1 rip 0xffffffff81e543d5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003770d2e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=268140 pid=26056 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a4aea38,0xffff8000355fd200 process=0xffff8000327f8460 user=0xffff800037708000, vmspace=0xfffffd806c1e0850 estcpu=29, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 38569 307188 62393 0 2 0 syz-executor 38569 392927 62393 0 2 0x4000000 syz-executor 21474 509954 57272 0 2 0 syz-executor 21474 113049 57272 0 2 0x4000000 syz-executor 59075 6900 67658 0 2 0 syz-executor 59075 370873 67658 0 3 0x4000080 fsleep syz-executor 64883 158747 50656 0 2 0 syz-executor 64883 18967 50656 0 2 0x4000000 syz-executor 26056 244927 89634 0 3 0x90 nanoslp syz-executor *26056 268140 89634 0 7 0x4000010 syz-executor 26056 300825 89634 0 3 0x4000090 fsleep syz-executor 58812 343122 10386 0 2 0x480 syz-executor 58812 460189 10386 0 3 0x4000080 pipewr syz-executor 58812 432433 10386 0 3 0x4000080 pipewr syz-executor 88890 159712 15593 -1 3 0x90 nanoslp syz-executor 88890 442413 15593 -1 3 0x4000090 ttyout syz-executor 88890 52996 15593 -1 3 0x4000090 fsleep syz-executor 88890 84075 15593 -1 3 0x4000090 fsleep syz-executor 5977 14811 0 0 3 0x14280 nfsidl nfsio 56839 101996 0 0 3 0x14280 nfsidl nfsio 55784 461912 0 0 3 0x14280 nfsidl nfsio 58566 176149 0 0 3 0x14280 nfsidl nfsio 31694 365315 0 0 3 0x14280 nfsidl nfsio 87641 161442 0 0 3 0x14280 nfsidl nfsio 61184 410245 0 0 3 0x14280 nfsidl nfsio 2061 110468 0 0 3 0x14280 nfsidl nfsio 30726 245052 0 0 3 0x14280 nfsidl nfsio 20304 24537 0 0 3 0x14280 nfsidl nfsio 54214 101148 0 0 3 0x14280 nfsidl nfsio 37474 122185 0 0 3 0x14280 nfsidl nfsio 32486 423095 0 0 3 0x14280 nfsidl nfsio 28287 221324 0 0 3 0x14280 nfsidl nfsio 90736 118803 0 0 3 0x14280 nfsidl nfsio 36644 385259 0 0 3 0x14280 nfsidl nfsio 8606 222145 0 0 3 0x14280 nfsidl nfsio 67369 454314 0 0 3 0x14280 nfsidl nfsio 70128 257252 0 0 3 0x14280 nfsidl nfsio 89935 226013 0 0 3 0x14280 nfsidl nfsio 26303 66408 0 0 3 0x14200 bored sosplice 83531 283357 0 0 3 0x14200 acct acct 15593 432062 8837 0 3 0x82 nanoslp syz-executor 10386 493001 8837 0 3 0x82 nanoslp syz-executor 62393 152535 8837 0 2 0x482 syz-executor 57272 339261 8837 0 3 0x82 nanoslp syz-executor 16631 467254 8837 0 3 0x82 nanoslp syz-executor 67658 81141 8837 0 2 0x482 syz-executor 89634 153646 8837 0 3 0x82 nanoslp syz-executor 50656 240777 8837 0 2 0x482 syz-executor 8837 21027 86401 0 3 0x82 kqread syz-executor 86401 449959 21162 0 3 0x10008a sigsusp ksh 21162 510380 7091 0 3 0x98 kqread sshd-session 7091 421859 27801 0 3 0x92 kqread sshd-session 17633 191111 1 0 3 0x100083 ttyin getty 27801 295674 1 0 3 0x88 kqread sshd 85789 124538 34674 73 3 0x1100090 kqread syslogd 34674 133379 1 0 3 0x100082 sbwait syslogd 24404 233763 1 0 3 0x100080 kqread resolvd 17614 301603 53474 77 3 0x100092 kqread dhcpleased 47884 483969 53474 77 3 0x100092 kqread dhcpleased 53474 170074 1 0 3 0x80 kqread dhcpleased 34861 91681 0 0 3 0x14200 bored smr 5935 79008 0 0 2 0x14200 zerothread 21736 146533 0 0 3 0x14200 aiodoned aiodoned 1986 11134 0 0 3 0x14200 syncer update 93285 293408 0 0 3 0x14200 cleaner cleaner 66282 352915 0 0 2 0x14200 reaper 23954 56392 0 0 3 0x14200 pgdaemon pagedaemon 95817 143191 0 0 3 0x14200 bored viomb 17522 370699 0 0 3 0x40014200 acpi0 acpi0 5995 57195 0 0 3 0x14200 bored softnet3 45047 274726 0 0 3 0x14200 bored softnet2 92544 439307 0 0 3 0x14200 bored softnet1 86310 341996 0 0 3 0x14200 bored softnet0 62462 14891 0 0 3 0x14200 bored systqmp 82340 405394 0 0 3 0x14200 bored systq 24460 331086 0 0 2 0x40014200 softclock 53958 442760 0 0 3 0x40014200 idle0 1 330669 0 0 3 0x82 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 10178 11107K 11428K 166960K 11569 0 pcb 17 12K 12K 166960K 67 0 rtable 204 6K 7K 166960K 395 0 pf 32 13K 14K 166960K 51 0 ifaddr 40 6K 7K 166960K 52 0 ifgroup 54 2K 2K 166960K 71 0 sysctl 0 0K 0K 166960K 2 0 counters 31 17K 17K 166960K 35 0 ioctlops 0 0K 4K 166960K 49 0 iov 1 12K 12K 166960K 10 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1429 90K 90K 166960K 1604 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 9 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 383 0 sigio 0 0K 0K 166960K 42 0 proc 60 59K 108K 166960K 503 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 29 0 in_multi 88 6K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 451 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 237 73K 86K 166960K 4983 0 UVM aobj 81 3K 3K 166960K 82 0 pinsyscall 38 76K 98K 166960K 1406 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 12 0K 2K 166960K 32 0 temp 48 6817K 6881K 166960K 19518 0 kqueue 13 20K 28K 166960K 68 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 56 0 53 1 0 1 1 0 8 0 rtentry 112 117 0 25 4 0 4 4 0 8 0 unpcb 144 437 0 420 6 5 1 6 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 126 0 122 7 6 1 7 0 8 0 arp 88 18 0 2 1 0 1 1 0 8 0 inpcb 336 333 0 326 6 4 2 6 0 8 1 nd6 104 27 0 4 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 1 0 1 1 1 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfrule 1344 2 0 2 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 496 0 93 29 1 28 29 0 8 1 art_table 32 497 0 93 4 0 4 4 0 8 0 art_node 16 115 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 5 1 0 1 1 0 8 0 semapl 112 7 0 1 1 0 1 1 0 8 0 shmpl 112 79 0 1 3 0 3 3 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 1998 0 498 95 0 95 95 0 8 0 ffsino 240 1998 0 498 89 0 89 89 0 8 0 nchpl 144 2575 0 899 63 0 63 63 0 8 0 uvmvnodes 80 2270 0 0 47 0 47 47 0 8 0 vnodes 216 2270 0 0 127 0 127 127 0 8 0 namei 1024 8014 0 8014 4 2 2 2 0 8 2 kstatmem 264 32 0 8 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 7664 0 7664 8 7 1 8 1 8 1 plimitpl 152 65 0 48 1 0 1 1 0 8 0 sigapl 424 685 0 617 8 0 8 8 0 8 0 futexpl 64 4441 0 4437 1 0 1 1 0 8 0 knotepl 120 19659 0 19612 22 13 9 16 0 8 7 kqueuepl 184 96 0 86 1 0 1 1 0 8 0 pipepl 288 134 0 106 4 1 3 3 0 8 0 fdescpl 432 647 0 618 5 1 4 5 0 8 0 filepl 120 3260 0 3014 13 3 10 12 0 8 2 lockfpl 104 169 0 166 1 0 1 1 0 8 0 lockfspl 48 45 0 42 1 0 1 1 0 8 0 sessionpl 144 21 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 15 1 0 1 1 0 8 0 ucredpl 104 404 0 391 1 0 1 1 0 8 0 zombiepl 144 658 0 657 1 0 1 1 0 8 0 processpl 1096 685 0 617 5 0 5 5 0 8 0 procpl 648 1077 0 998 8 0 8 8 0 8 0 sosppl 168 4 0 4 1 1 0 1 0 8 0 sockpl 504 830 0 803 25 20 5 21 0 8 0 mcl64k 65536 2 0 2 2 1 1 1 0 8 1 mcl8k 8192 10 0 10 1 1 0 1 0 8 0 mcl4k 4096 2911 0 2860 16 8 8 15 0 8 0 mcl2k 2048 440 0 439 5 3 2 4 0 8 1 mtagpl 96 19 0 7 1 0 1 1 0 8 0 mbufpl 256 6695 0 6546 15 3 12 14 0 8 0 bufpl 280 2658 0 94 184 0 184 184 0 8 0 anonpl 24 161535 0 158033 23 1 22 22 0 187 0 amapchunkpl 152 17310 0 16772 37 7 30 30 0 158 9 amappl16 200 3678 0 3649 4 2 2 4 0 8 0 amappl15 192 15 0 14 1 0 1 1 0 8 0 amappl14 184 113 0 103 1 0 1 1 0 8 0 amappl13 176 10 0 10 1 1 0 1 0 8 0 amappl12 168 1263 0 1232 3 1 2 3 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 17 0 17 1 1 0 1 0 8 0 amappl9 144 112 0 112 1 1 0 1 0 8 0 amappl8 136 19 0 17 1 0 1 1 0 8 0 amappl7 128 98 0 88 1 0 1 1 0 8 0 amappl6 120 164 0 163 1 0 1 1 0 8 0 amappl5 112 128 0 119 1 0 1 1 0 8 0 amappl4 104 285 0 269 1 0 1 1 0 8 0 amappl3 96 3167 0 3065 3 0 3 3 0 8 0 amappl2 88 916 0 835 2 0 2 2 0 8 0 amappl1 80 8015 0 7496 13 2 11 13 0 8 0 amappl 88 4617 0 4434 5 0 5 5 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 81 0 1 2 0 2 2 0 8 0 uaddrrnd 24 647 0 617 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 647 0 617 1 0 1 1 0 8 0 vmmpekpl 168 6347 0 6309 2 0 2 2 0 8 0 vmmpepl 168 46711 0 44910 80 0 80 80 0 357 1 vmsppl 352 646 0 617 4 1 3 4 0 8 0 rwobjpl 24 18930 0 15710 20 0 20 20 0 8 0 pdppl 4096 1301 0 1234 95 28 67 81 0 8 0 pvpl 32 333404 0 324568 82 5 77 81 0 265 1 pmappl 216 646 0 617 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 401 0 81 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b7685) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8306a957,ffffffff8306a6a0,307,ffffffff830251d7) at __assert+0x29 splraise(deadbeef) at splraise+0xad sys/arch/amd64/amd64/intr.c:775 mtx_enter(ffff8000012d8008) at mtx_enter+0x9e sys/kern/kern_lock.c:308 klist_mutex_lock(ffff8000012d8008) at klist_mutex_lock+0x32 sys/kern/kern_event.c:2352 klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 klist_lock sys/kern/kern_event.c:2317 [inline] klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 sys/kern/kern_event.c:2283 bpfsdetach(ffff800001286fc0) at bpfsdetach+0xff sys/net/bpf.c:1800 bpfdetach(ffff80000128c800) at bpfdetach+0x76 if_detach(ffff80000128c800) at if_detach+0x14f sys/net/if.c:1193 tun_clone_destroy(ffff80000128c800) at tun_clone_destroy+0x2aa sys/net/if_tun.c:338 if_clone_destroy(ffff80003770d650) at if_clone_destroy+0x1d7 sys/net/if.c:1382 sys_ioctl(ffff800035c0c028,ffff80003770d830,ffff80003770d780) at sys_ioctl+0x678 syscall(ffff80003770d830) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa065a63c0, count: -15 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b7685) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8306a957,ffffffff8306a6a0,307,ffffffff830251d7) at __assert+0x29 splraise(deadbeef) at splraise+0xad sys/arch/amd64/amd64/intr.c:775 mtx_enter(ffff8000012d8008) at mtx_enter+0x9e sys/kern/kern_lock.c:308 klist_mutex_lock(ffff8000012d8008) at klist_mutex_lock+0x32 sys/kern/kern_event.c:2352 klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 klist_lock sys/kern/kern_event.c:2317 [inline] klist_invalidate(ffff8000012d80a8) at klist_invalidate+0xe6 sys/kern/kern_event.c:2283 bpfsdetach(ffff800001286fc0) at bpfsdetach+0xff sys/net/bpf.c:1800 bpfdetach(ffff80000128c800) at bpfdetach+0x76 if_detach(ffff80000128c800) at if_detach+0x14f sys/net/if.c:1193 tun_clone_destroy(ffff80000128c800) at tun_clone_destroy+0x2aa sys/net/if_tun.c:338 if_clone_destroy(ffff80003770d650) at if_clone_destroy+0x1d7 sys/net/if.c:1382 sys_ioctl(ffff800035c0c028,ffff80003770d830,ffff80003770d780) at sys_ioctl+0x678 syscall(ffff80003770d830) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa065a63c0, count: -15