ppanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_fork.c", line 677 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *406033 68394 32767 0x10 0x4000000 1 syz-executor.3 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff827e0e3c,2a5,ffffffff827d9617) at __assert+0x29 sys/kern/subr_prf.c:157 proc_trampoline_mp() at proc_trampoline_mp+0x135 end trace frame: 0x0, count: 11 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 "nlevel >= IPL_NONE" failed: file "/syzkaller/managers/setuid/kernel/sys/arch/amd64/amd64/intr.c", line 699 cpu1: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_fork.c", line 677 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff827e0e3c,2a5,ffffffff827d9617) at __assert+0x29 sys/kern/subr_prf.c:157 proc_trampoline_mp() at proc_trampoline_mp+0x135 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000247098e0 rbx 0xffff800020d59b9f rdx 0 rcx 0xffff8000212a22b0 rax 0xffff800020d58ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8be8a845046c4ae r11 0x1d0c52301d4e0af5 r12 0xffff800020d599a0 r13 0 r14 0xffffffff82c209a0 cpu_info_full_primary+0x29a0 r15 0x1 rip 0xffffffff814c2d0c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000247098d0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.3) pid=406033 stat=onproc flags process=10 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000212a2ff8,0xffffffff82cacb30 process=0xffff800027b810d8 user=0xffff800024704000, vmspace=0xfffffd8069d4e020 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58453 444955 90137 32767 2 0x10 syz-executor.4 68394 167667 26298 32767 2 0x10 syz-executor.3 68394 241806 26298 32767 2 0x4000010 syz-executor.3 *68394 406033 26298 32767 7 0x4000010 syz-executor.3 36942 375112 32639 32767 2 0x10 syz-executor.0 36942 295168 32639 32767 2 0x4000010 syz-executor.0 80103 242813 0 0 3 0x14200 bored sosplice 70240 77654 74570 32767 2 0x10 syz-executor.7 79297 311055 25690 32767 2 0x10 syz-executor.2 74570 488908 37666 0 3 0x82 wait syz-executor.7 97035 436727 98922 32767 3 0x10 biowait syz-executor.6 98922 64092 37666 0 3 0x82 wait syz-executor.6 96203 197352 7279 32767 2 0x10 syz-executor.5 26298 286316 91391 32767 3 0x90 nanoslp syz-executor.3 7279 487942 37666 0 3 0x82 wait syz-executor.5 90137 364209 96120 32767 3 0x90 nanoslp syz-executor.4 25690 274179 37666 0 3 0x82 wait syz-executor.2 96120 400598 37666 0 3 0x82 wait syz-executor.4 91391 306959 37666 0 3 0x82 wait syz-executor.3 14523 301318 78642 32767 3 0x90 nanoslp syz-executor.1 32639 16192 43498 32767 3 0x90 nanoslp syz-executor.0 78642 448585 37666 0 3 0x82 wait syz-executor.1 43498 237497 37666 0 3 0x82 wait syz-executor.0 37666 189281 43062 0 3 0x2000082 thrsleep syz-fuzzer 37666 492012 43062 0 3 0x6000082 nanoslp syz-fuzzer 37666 73665 43062 0 3 0x6000082 wait syz-fuzzer 37666 285910 43062 0 3 0x6000082 wait syz-fuzzer 37666 68197 43062 0 3 0x6000082 wait syz-fuzzer 37666 61590 43062 0 3 0x6000082 thrsleep syz-fuzzer 37666 268308 43062 0 3 0x6000082 wait syz-fuzzer 37666 381898 43062 0 3 0x6000082 wait syz-fuzzer 37666 250171 43062 0 3 0x6000082 thrsleep syz-fuzzer 37666 259088 43062 0 3 0x6000082 wait syz-fuzzer 37666 462481 43062 0 3 0x6000082 thrsleep syz-fuzzer 37666 317352 43062 0 3 0x6000082 wait syz-fuzzer 37666 209691 43062 0 3 0x6000082 kqread syz-fuzzer 37666 239569 43062 0 3 0x6000082 thrsleep syz-fuzzer 37666 443676 43062 0 3 0x6000082 wait syz-fuzzer 43062 432148 47666 0 3 0x10008a sigsusp ksh 47666 124011 61943 0 3 0x9a kqread sshd 3378 243157 1 0 3 0x100083 ttyin getty 61943 421676 1 0 3 0x88 kqread sshd 48473 362606 63759 73 3 0x1100090 kqread syslogd 63759 289240 1 0 3 0x100082 netio syslogd 3901 219423 1 0 3 0x100080 kqread resolvd 30887 474838 48954 77 3 0x100092 kqread dhcpleased 39576 237926 48954 77 3 0x100092 kqread dhcpleased 48954 518940 1 0 3 0x80 kqread dhcpleased 99455 333483 0 0 3 0x14200 bored smr 591 514925 0 0 2 0x14200 zerothread 94368 115096 0 0 3 0x14200 aiodoned aiodoned 94607 127375 0 0 3 0x14200 syncer update 21590 298785 0 0 3 0x14200 cleaner cleaner 1788 29295 0 0 2 0x14200 reaper 36603 285146 0 0 3 0x14200 pgdaemon pagedaemon 2264 201594 0 0 3 0x14200 bored viomb 29862 10767 0 0 3 0x40014200 acpi0 acpi0 10023 458426 0 0 3 0x40014200 idle1 73980 174743 0 0 3 0x14200 bored softnet3 28367 61308 0 0 3 0x14200 bored softnet2 15225 97560 0 0 3 0x14200 bored softnet1 5970 495017 0 0 3 0x14200 bored softnet0 65777 250639 0 0 3 0x14200 bored systqmp 29152 512413 0 0 3 0x14200 bored systq 65840 259367 0 0 3 0x40014200 bored softclock 91521 161589 0 0 3 0x40014200 idle0 1 518688 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 97035 (syz-executor.6) thread 0xffff80002129a2a8 (436727) exclusive rrwlock inode r = 0 (0xfffffd806ba2c4e8) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ba2ce78) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10187 6409K 6420K 78643K 11265 0 pcb 13 8K 8K 78643K 13 0 rtable 236 6K 6K 78643K 373 0 pf 29 8K 8K 78643K 29 0 ifaddr 44 15K 15K 78643K 46 0 ifgroup 50 2K 2K 78643K 50 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 33 0 iov 0 0K 16K 78643K 80 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1278 80K 80K 78643K 1333 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 10 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 189 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 125K 78643K 1241 0 sigio 0 0K 0K 78643K 247 0 proc 56 78K 127K 78643K 576 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 56 0 in_multi 99 7K 7K 78643K 115 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 490 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 321 85K 89K 78643K 13999 0 UVM aobj 87 3K 3K 78643K 90 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2 0 NDP 11 0K 2K 78643K 27 0 temp 74 5920K 5984K 78643K 6394 0 kqueue 12 18K 20K 78643K 60 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 55 0 52 1 0 1 1 0 8 0 rtentry 112 114 0 3 4 0 4 4 0 8 0 unpcb 144 336 0 323 4 2 2 3 0 8 1 syncache 304 13 0 13 3 2 1 1 0 8 1 tcpqe 32 237 0 237 3 3 0 1 0 8 0 tcpcb 808 1013 0 996 9 3 6 8 0 8 3 arp 120 19 0 0 1 0 1 1 0 8 0 inpcb 368 1434 0 1409 9 3 6 8 0 8 3 nd6 136 26 0 2 1 0 1 1 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 256 463 0 9 29 0 29 29 0 8 0 art_table 32 464 0 9 4 0 4 4 0 8 0 art_node 16 113 0 12 1 0 1 1 0 8 0 semapl 112 187 0 177 1 0 1 1 0 8 0 shmpl 112 87 0 3 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2793 0 1349 91 0 91 91 0 8 0 ffsino 272 2793 0 1349 97 0 97 97 0 8 0 nchpl 144 4509 0 2832 63 0 63 63 0 8 0 uvmvnodes 80 2906 0 0 60 0 60 60 0 8 0 vnodes 216 2906 0 0 162 0 162 162 0 8 0 namei 1024 14059 0 14058 3 2 1 2 0 8 0 percpumem 16 43 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 14416 0 14415 12 9 3 8 1 8 2 plimitpl 152 122 0 99 3 1 2 2 0 8 1 sigapl 424 1536 0 1485 7 0 7 7 0 8 0 futexpl 64 10251 0 10251 1 0 1 1 0 8 1 knotepl 120 116 0 0 4 0 4 4 0 8 0 kqueuepl 216 188 0 180 5 0 5 5 0 8 4 pipepl 320 248 0 220 3 0 3 3 0 8 0 fdescpl 496 1518 0 1485 7 1 6 6 0 8 0 filepl 152 6916 0 6680 14 0 14 14 0 8 4 lockfpl 104 220 0 218 1 0 1 1 0 8 0 lockfspl 48 48 0 46 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 104 546 0 528 1 0 1 1 0 8 0 zombiepl 144 1486 0 1485 1 0 1 1 0 8 0 processpl 1072 1536 0 1485 5 1 4 5 0 8 0 procpl 680 3424 0 3355 8 1 7 8 0 8 0 sosppl 168 9 0 9 2 1 1 1 0 8 1 sockpl 488 1947 0 1909 19 9 10 17 0 8 4 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 257 0 0 33 0 33 33 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 277 0 0 18 0 18 18 0 8 0 bufpl 288 5724 0 134 400 0 400 400 0 8 0 anonpl 24 291577 0 280997 93 14 79 89 0 186 10 amapchunkpl 152 44831 0 44009 40 2 38 40 0 158 3 amappl16 200 7724 0 7468 27 10 17 26 0 8 3 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 157 0 144 2 1 1 2 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 2149 0 2116 2 0 2 2 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 31 0 22 1 0 1 1 0 8 0 amappl9 144 187 0 186 1 0 1 1 0 8 0 amappl8 136 240 0 174 3 0 3 3 0 8 0 amappl7 128 62 0 50 2 0 2 2 0 8 0 amappl6 120 220 0 200 2 0 2 2 0 8 0 amappl5 112 193 0 183 1 0 1 1 0 8 0 amappl4 104 553 0 515 2 0 2 2 0 8 0 amappl3 96 9194 0 9109 4 1 3 4 0 8 0 amappl2 88 1820 0 1749 3 1 2 3 0 8 0 amappl1 80 13744 0 13218 22 9 13 22 0 8 0 amappl 88 13459 0 13235 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 89 0 3 2 0 2 2 0 8 0 uaddrrnd 24 1518 0 1485 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1518 0 1485 1 0 1 1 0 8 0 vmmpekpl 168 15265 0 15215 3 0 3 3 0 8 0 vmmpepl 168 108456 0 106257 118 11 107 116 0 357 2 vmsppl 464 1517 0 1485 7 1 6 6 0 8 0 rwobjpl 56 36907 0 32665 62 2 60 60 0 8 0 pdppl 4096 3044 0 2970 132 50 82 96 0 8 8 pvpl 32 671158 0 654801 339 26 313 339 0 265 172 pmappl 248 1517 0 1485 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 842 0 61 23 0 23 23 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c1fff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82c97058) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c97058) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800024716cf0,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(70) at cnputc+0x4f sys/dev/cons.c:218 db_putchar(70) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x6bc sys/kern/subr_prf.c:724 db_printf(ffffffff8282065e) at db_printf+0x89 sys/kern/subr_prf.c:498 panic(ffffffff8279dc9a) at panic+0xdb sys/kern/subr_prf.c:216 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(85da120c) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 end trace frame: 0xffff8000247171a0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82c1fff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82c97058) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c97058) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff800024716cf0,ffff80000007b080) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(70) at cnputc+0x4f sys/dev/cons.c:218 db_putchar(70) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x6bc sys/kern/subr_prf.c:724 db_printf(ffffffff8282065e) at db_printf+0x89 sys/kern/subr_prf.c:498 panic(ffffffff8279dc9a) at panic+0xdb sys/kern/subr_prf.c:216 __assert(ffffffff82820322,ffffffff8283c727,2bb,ffffffff827a1c2e) at __assert+0x29 sys/kern/subr_prf.c:157 splraise(85da120c) at splraise+0xb4 sys/arch/amd64/amd64/intr.c:699 mtx_enter_try(fffffd806f152ca8) at mtx_enter_try+0x73 sys/kern/kern_lock.c:291 mtx_enter(fffffd806f152ca8) at mtx_enter+0x4f sys/kern/kern_lock.c:266 knote_remove(ffff8000212a3548,fffffd806f152ca8,fffffd806f152d30,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000212a3548,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000212a3548) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000212a3548,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000212a3548,ffff800024717400,ffff800024717450) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000247174d0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000247174d0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7844a6871ec0, count: -23 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff827e0e3c,2a5,ffffffff827d9617) at __assert+0x29 sys/kern/subr_prf.c:157 proc_trampoline_mp() at proc_trampoline_mp+0x135 end trace frame: 0x0, count: 11 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279dc9a) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820322,ffffffff827e0e3c,2a5,ffffffff827d9617) at __assert+0x29 sys/kern/subr_prf.c:157 proc_trampoline_mp() at proc_trampoline_mp+0x135 end trace frame: 0x0, count: -4