ppanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 675 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *411668 88825 0 0 0 1 syz-executor.4 385971 22009 0 0x2 0 0 syz-executor.3 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82791d93) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82813f97,ffffffff827f9960,2a3,ffffffff827d091b) 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: vop_generic_badop cpu1: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 675 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82791d93) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82813f97,ffffffff827f9960,2a3,ffffffff827d091b) 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 0xffff800027b5af10 rbx 0xffff800020d59b8f rdx 0 rcx 0 rax 0xffff8000211ad310 r8 0x101010101010101 r9 0x8080808080808080 r10 0x18465fc03e60837d r11 0xd59f65c41acd1a28 r12 0xffff800020d59990 r13 0 r14 0xffffffff82c32990 cpu_info_full_primary+0x2990 r15 0x1 rip 0xffffffff821c176c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800027b5af00 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.4) pid=411668 stat=onproc flags process=0 proc=0 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000211f3b40,0xffffffff82cf3130 process=0xffff800021223250 user=0xffff800027b56000, vmspace=0xfffffd8069c35588 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *88825 411668 6223 0 7 0 syz-executor.4 46622 222051 71542 0 3 0x80 nanoslp syz-executor.1 46622 222084 71542 0 3 0x4000080 fsleep syz-executor.1 46622 4657 71542 0 3 0x4000080 fsleep syz-executor.1 46622 143944 71542 0 3 0x4000080 fsleep syz-executor.1 72961 240403 21351 0 3 0x80 nanoslp syz-executor.2 72961 49026 21351 0 3 0x4000080 fsleep syz-executor.2 72961 250363 21351 0 3 0x4000080 fsleep syz-executor.2 72961 218278 21351 0 3 0x4000080 fsleep syz-executor.2 72961 91896 21351 0 2 0x4000000 syz-executor.2 40678 367945 0 0 3 0x14200 acct acct 37903 130919 70725 0 3 0x2 biowait syz-executor.5 26098 170761 1 0 3 0x100083 ttyin getty 71542 155786 70725 0 3 0x82 nanoslp syz-executor.1 21351 33349 70725 0 3 0x82 nanoslp syz-executor.2 84992 133743 0 0 3 0x14200 bored sosplice 4647 465784 70725 0 3 0x2 biowait syz-executor.7 17528 370424 70725 0 3 0x2 biowait syz-executor.6 6223 292335 70725 0 2 0x2 syz-executor.4 22009 385971 70725 0 7 0x2 syz-executor.3 90103 168140 70725 0 3 0x82 nanoslp syz-executor.0 70725 49368 72199 0 3 0x82 thrsleep syz-fuzzer 70725 191123 72199 0 3 0x4000082 nanoslp syz-fuzzer 70725 266623 72199 0 3 0x4000082 wait syz-fuzzer 70725 1444 72199 0 3 0x4000082 thrsleep syz-fuzzer 70725 513539 72199 0 3 0x4000082 wait syz-fuzzer 70725 145852 72199 0 3 0x4000082 thrsleep syz-fuzzer 70725 181829 72199 0 3 0x4000082 wait syz-fuzzer 70725 419319 72199 0 3 0x4000082 wait syz-fuzzer 70725 265942 72199 0 3 0x4000082 wait syz-fuzzer 70725 69799 72199 0 3 0x4000082 thrsleep syz-fuzzer 70725 101974 72199 0 3 0x4000082 thrsleep syz-fuzzer 70725 457469 72199 0 3 0x4000082 wait syz-fuzzer 70725 362425 72199 0 3 0x4000082 kqread syz-fuzzer 70725 148968 72199 0 3 0x4000082 wait syz-fuzzer 70725 215375 72199 0 3 0x4000082 wait syz-fuzzer 70725 869 72199 0 3 0x4000082 thrsleep syz-fuzzer 72199 44044 86085 0 3 0x10008a sigsusp ksh 86085 313638 70195 0 3 0x9a kqread sshd 70195 97628 1 0 3 0x88 kqread sshd 93938 54391 64714 74 3 0x1100092 bpf pflogd 64714 482431 1 0 3 0x80 netio pflogd 92245 453730 10605 73 3 0x1100090 kqread syslogd 10605 395529 1 0 3 0x100082 netio syslogd 68464 286346 1 0 3 0x100080 kqread resolvd 38260 289192 92811 77 3 0x100092 kqread dhcpleased 75150 91357 92811 77 3 0x100092 kqread dhcpleased 92811 85952 1 0 3 0x80 kqread dhcpleased 14199 100111 0 0 3 0x14200 bored smr 99483 126152 0 0 2 0x14200 zerothread 69754 89644 0 0 3 0x14200 aiodoned aiodoned 72247 256248 0 0 3 0x14200 syncer update 1465 277370 0 0 3 0x14200 cleaner cleaner 66642 12450 0 0 3 0x14200 reaper reaper 82568 186471 0 0 3 0x14200 pgdaemon pagedaemon 3350 340012 0 0 3 0x14200 bored viomb 54839 241061 0 0 3 0x40014200 acpi0 acpi0 91986 364546 0 0 3 0x40014200 idle1 80918 22118 0 0 3 0x14200 bored softnet3 97549 84140 0 0 3 0x14200 bored softnet2 8656 94039 0 0 3 0x14200 bored softnet1 58577 357827 0 0 3 0x14200 bored softnet0 68601 458654 0 0 3 0x14200 bored systqmp 63954 428732 0 0 3 0x14200 bored systq 22671 123091 0 0 3 0x40014200 bored softclock 49186 147139 0 0 3 0x40014200 idle0 1 182738 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 6501K 8413K 78643K 16133 0 pcb 15 12K 17K 78643K 2405 0 rtable 253 8K 8K 78643K 832 0 ifaddr 82 26K 29K 78643K 340 0 ifgroup 62 2K 3K 78643K 317 0 sysctl 2 0K 0K 78643K 2 0 counters 62 36K 37K 78643K 238 0 ioctlops 0 0K 4K 78643K 1914 0 iov 0 0K 60K 78643K 785 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1374 86K 86K 78643K 4071 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 33K 78643K 130 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1301 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 81K 78643K 13894 0 sigio 0 0K 0K 78643K 42 0 proc 71 91K 151K 78643K 1456 0 subproc 104 6K 6K 78643K 161 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 424 0 in_multi 95 7K 7K 78643K 335 0 ether_multi 1 0K 0K 78643K 119 0 mrt 1 0K 0K 78643K 70 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 91 413K 413K 78643K 91 0 exec 0 0K 1K 78643K 749 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 393 95K 128K 78643K 131365 0 UVM aobj 131 4K 4K 78643K 175 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 305 0 NDP 13 0K 2K 78643K 94 0 temp 74 5864K 6892K 78643K 58229 0 kqueue 12 18K 34K 78643K 605 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 120 410 0 407 3 2 1 3 0 8 0 rtentry 112 262 0 145 4 0 4 4 0 8 0 unpcb 144 5666 0 5651 36 35 1 6 0 8 0 syncache 296 41 0 41 4 4 0 1 0 8 0 tcpqe 32 202 63 202 2 2 0 1 0 8 0 tcpcb 776 3656 0 3650 64 61 3 8 0 8 2 arp 120 71 0 37 2 0 2 2 0 8 0 ipq 40 4 0 4 1 1 0 1 0 8 0 ipqe 40 12 0 12 1 1 0 1 0 8 0 inpcb 368 7216 0 7156 99 87 12 14 0 8 5 nd6 136 35 0 9 1 0 1 1 0 8 0 pkpcb 40 16 0 16 4 4 0 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1256 41 0 41 2 2 0 1 0 8 0 pppxif 1456 19 0 19 2 2 0 1 0 8 0 pfstscr 40 10 0 10 1 1 0 1 0 8 0 pffrag 232 5 0 5 2 2 0 1 0 482 0 pffrnode 88 5 0 5 2 2 0 1 0 8 0 pffrent 40 13 0 13 3 3 0 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfanchor 1288 512 9 0 43 0 43 43 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 264 7 0 0 1 0 1 1 0 8 0 pfstitem 24 842 0 627 2 0 2 2 0 8 0 pfstkey 128 894 0 679 11 3 8 9 0 8 0 pfstate 384 868 0 654 36 12 24 25 0 8 1 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 15 0 15 2 2 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1064 0 539 40 7 33 33 0 8 0 art_table 32 1065 0 539 6 1 5 5 0 8 0 art_node 16 256 0 154 1 0 1 1 0 8 0 sysvmsgpl 40 80 0 80 1 1 0 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 1299 0 1289 1 0 1 1 0 8 0 shmpl 112 172 0 44 5 1 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 21379 0 19863 96 0 96 96 0 8 0 ffsino 272 21379 0 19863 102 0 102 102 0 8 0 nchpl 144 43261 0 42766 64 40 24 64 0 8 0 uvmvnodes 80 6128 0 0 126 0 126 126 0 8 0 vnodes 216 6128 0 0 341 0 341 341 0 8 0 namei 1024 123232 0 123231 6 5 1 2 0 8 0 percpumem 16 132 0 88 1 0 1 1 0 8 0 kstatmem 264 144 0 118 3 1 2 3 0 8 0 scsiplug 72 7 0 7 1 1 0 1 0 8 0 scxspl 216 122067 0 122064 15 14 1 8 0 8 0 plimitpl 152 301 0 285 1 0 1 1 0 8 0 sigapl 424 14213 0 14167 7 1 6 6 0 8 0 futexpl 64 99272 0 99266 3 2 1 1 0 8 0 knotepl 120 690 0 0 21 4 17 21 0 8 0 kqueuepl 216 1894 0 1886 22 17 5 5 0 8 4 pipepl 320 1257 0 1229 36 33 3 8 0 8 0 fdescpl 496 14194 0 14168 5 0 5 5 0 8 0 filepl 152 56178 0 55938 80 67 13 17 0 8 3 lockfpl 104 7462 0 7460 3 2 1 2 0 8 0 lockfspl 48 2966 0 2964 1 0 1 1 0 8 0 sessionpl 144 28 0 11 1 0 1 1 0 8 0 pgrppl 48 81 0 64 1 0 1 1 0 8 0 ucredpl 104 4211 0 4199 1 0 1 1 0 8 0 zombiepl 144 14168 0 14167 1 0 1 1 0 8 0 processpl 1072 14213 0 14167 4 0 4 4 0 8 0 procpl 696 35527 0 35459 23 15 8 10 0 8 1 sosppl 168 88 0 88 6 6 0 1 0 8 0 sockpl 488 13314 0 13285 171 159 12 24 0 8 7 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 39 0 0 4 2 2 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 28 0 0 4 1 3 3 0 8 0 mcl4k 4096 34 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 589 0 0 30 11 19 30 0 8 0 mtagpl 96 410 0 0 10 0 10 10 0 8 0 mbufpl 256 7428 0 0 447 0 447 447 0 8 0 bufpl 288 23571 0 17257 452 0 452 452 0 8 0 anonpl 24 1379686 0 1369411 384 311 73 279 0 186 0 amapchunkpl 152 419738 0 419002 195 160 35 119 0 158 1 amappl16 200 26329 0 26028 113 96 17 45 0 8 1 amappl15 192 10 0 10 2 2 0 1 0 8 0 amappl14 184 200 0 181 2 0 2 2 0 8 0 amappl13 176 28 0 27 1 0 1 1 0 8 0 amappl12 168 14915 0 14888 3 1 2 2 0 8 0 amappl11 160 66 0 50 1 0 1 1 0 8 0 amappl10 152 71 0 58 1 0 1 1 0 8 0 amappl9 144 262 0 262 8 8 0 2 0 8 0 amappl8 136 534 0 386 6 0 6 6 0 8 0 amappl7 128 160 0 144 1 0 1 1 0 8 0 amappl6 120 326 0 305 2 1 1 2 0 8 0 amappl5 112 226 0 217 1 0 1 1 0 8 0 amappl4 104 957 0 915 3 0 3 3 0 8 0 amappl3 96 81992 0 81915 6 3 3 4 0 8 0 amappl2 88 14694 0 14629 3 1 2 3 0 8 0 amappl1 80 55770 0 55233 23 9 14 23 0 8 0 amappl 88 130466 0 130262 9 3 6 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 72 174 0 44 3 0 3 3 0 8 0 uaddrrnd 24 14194 0 14168 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 14194 0 14168 1 0 1 1 0 8 0 vmmpekpl 168 94261 0 94202 4 0 4 4 0 8 0 vmmpepl 168 814392 0 812161 233 124 109 123 0 357 3 vmsppl 464 14193 0 14168 5 0 5 5 0 8 0 rwobjpl 56 190787 0 183074 121 11 110 110 0 8 0 pdppl 4096 28396 0 28336 589 519 70 80 0 8 10 pvpl 32 4302469 0 4286722 836 673 163 534 0 265 0 pmappl 248 14193 0 14168 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1884 0 636 36 0 36 36 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c31ff0) 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+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:577 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:148 __mp_lock(ffffffff82cf2ef8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cf2ef8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff80002472b0a0,ffff80000006ba00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_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(ffffffff82814fab) at db_printf+0x89 sys/kern/subr_prf.c:498 panic(ffffffff82788705) at panic+0xdb sys/kern/subr_prf.c:216 vop_generic_badop(ffff80002472b4c8) at vop_generic_badop+0x1f sys/kern/vfs_default.c:133 end trace frame: 0xffff80002472b510, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82c31ff0) 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+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:577 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:148 __mp_lock(ffffffff82cf2ef8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cf2ef8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff80002472b0a0,ffff80000006ba00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_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(ffffffff82814fab) at db_printf+0x89 sys/kern/subr_prf.c:498 panic(ffffffff82788705) at panic+0xdb sys/kern/subr_prf.c:216 vop_generic_badop(ffff80002472b4c8) at vop_generic_badop+0x1f sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd80725e6870,fffffd80726b93a0) at VOP_STRATEGY+0x9f sys/kern/vfs_vops.c:628 bwrite(fffffd80726b93a0) at bwrite+0x1f4 sys/kern/vfs_bio.c:760 VOP_BWRITE(fffffd80726b93a0) at VOP_BWRITE+0x4e sys/kern/vfs_vops.c:640 ufs_mkdir(ffff80002472b760) at ufs_mkdir+0x6c4 sys/ufs/ufs/ufs_vnops.c:1235 VOP_MKDIR(fffffd807ab56a50,ffff80002472b8c0,ffff80002472b8f0,ffff80002472b7f0) at VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 domkdirat(ffff8000211eb898,ffffff9c,791dad096430,1ff) at domkdirat+0x125 sys/kern/vfs_syscalls.c:3074 syscall(ffff80002472ba70) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002472ba70) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x791dad0964a0, count: -22 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(ffffffff82791d93) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82813f97,ffffffff827f9960,2a3,ffffffff827d091b) 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(ffffffff82791d93) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82813f97,ffffffff827f9960,2a3,ffffffff827d091b) at __assert+0x29 sys/kern/subr_prf.c:157 proc_trampoline_mp() at proc_trampoline_mp+0x135 end trace frame: 0x0, count: -4