panic: kernel diagnostic assertion "p == curproc" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/vfs_vops.c", line 169 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 24733 96311 0 0x14000 0x200 1 reaper *238712 39529 0 0x14000 0x200 0K systq db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f472c) at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff8224a9ea,ffffffff8224bf14,a9,ffffffff8222a32f) at __assert+0x2b sys/kern/subr_prf.c:154 VOP_CLOSE(fffffd80671f2420,1,fffffd807f7bfb40,0) at VOP_CLOSE+0x12f sys/kern/vfs_vops.c:170 vn_closefile(fffffd806807edc8,0) at vn_closefile+0xd7 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd806807edc8,0) at vn_closefile+0xd7 sys/kern/vfs_vnops.c:614 fdrop(fffffd806807edc8,0) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 closef(fffffd806807edc8,0) at closef+0x11c sys/kern/kern_descrip.c:1260 unp_gc(0) at unp_gc+0x172 sys/kern/uipc_usrreq.c:944 taskq_thread(ffffffff8248bfb0) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: 6 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic kernel diagnostic assertion "p == curproc" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/vfs_vops.c", line 169 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f472c) at panic+0x15c sys/kern/subr_prf.c:207 __assert(ffffffff8224a9ea,ffffffff8224bf14,a9,ffffffff8222a32f) at __assert+0x2b sys/kern/subr_prf.c:154 VOP_CLOSE(fffffd80671f2420,1,fffffd807f7bfb40,0) at VOP_CLOSE+0x12f sys/kern/vfs_vops.c:170 vn_closefile(fffffd806807edc8,0) at vn_closefile+0xd7 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd806807edc8,0) at vn_closefile+0xd7 sys/kern/vfs_vnops.c:614 fdrop(fffffd806807edc8,0) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 closef(fffffd806807edc8,0) at closef+0x11c sys/kern/kern_descrip.c:1260 unp_gc(0) at unp_gc+0x172 sys/kern/uipc_usrreq.c:944 taskq_thread(ffffffff8248bfb0) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020a2cf60 rbx 0xffff800020a2d010 rdx 0xffff800020a189c0 rcx 0 rax 0 r8 0xffffffff81e1786f kprintf+0x16f r9 0x1 r10 0x25 r11 0xff666c4023911492 r12 0x3000000008 r13 0xffff800020a2cf70 r14 0x100 r15 0x1 rip 0xffffffff81f88cf8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020a2cf50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (systq) pid=238712 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020a18c30,0xffff800020a18010 process=0xffff800020a1a7b0 user=0xffff800020a28000, vmspace=0xffffffff82648778 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39471 314561 82501 0 2 0x482 syz-executor.1 98169 97607 82501 0 3 0x82 nanosleep syz-executor.0 82501 278332 24986 0 3 0x82 thrsleep syz-fuzzer 82501 68766 24986 0 3 0x4000082 thrsleep syz-fuzzer 82501 402655 24986 0 3 0x4000082 thrsleep syz-fuzzer 82501 521120 24986 0 3 0x4000082 thrsleep syz-fuzzer 82501 265900 24986 0 3 0x4000082 thrsleep syz-fuzzer 82501 511078 24986 0 3 0x4000082 thrsleep syz-fuzzer 82501 167937 24986 0 3 0x4000082 thrsleep syz-fuzzer 82501 48509 24986 0 3 0x4000082 thrsleep syz-fuzzer 82501 132802 24986 0 3 0x4000082 kqread syz-fuzzer 82501 220353 24986 0 3 0x4000082 thrsleep syz-fuzzer 24986 107217 72287 0 3 0x10008a pause ksh 72287 401409 44043 0 3 0x92 select sshd 94516 413689 1 0 3 0x100083 ttyin getty 44043 212423 1 0 3 0x80 select sshd 67974 512555 49211 74 3 0x100092 bpf pflogd 49211 354335 1 0 3 0x80 netio pflogd 36159 471414 53247 73 3 0x100090 kqread syslogd 53247 217676 1 0 3 0x100082 netio syslogd 31935 408452 1 77 3 0x100090 poll dhclient 81479 158990 1 0 3 0x80 poll dhclient 94816 515883 0 0 3 0x14200 bored smr 38628 196512 0 0 3 0x14200 pgzero zerothread 25809 16296 0 0 3 0x14200 aiodoned aiodoned 65043 21874 0 0 3 0x14200 syncer update 26275 168563 0 0 3 0x14200 cleaner cleaner 96311 24733 0 0 7 0x14200 reaper 48509 74173 0 0 3 0x14200 pgdaemon pagedaemon 50123 255657 0 0 3 0x14200 bored crynlk 81388 267544 0 0 3 0x14200 bored crypto 98987 385039 0 0 3 0x40014200 acpi0 acpi0 67742 340689 0 0 3 0x40014200 idle1 28162 263982 0 0 3 0x14200 bored softnet 98739 251389 0 0 3 0x14200 bored systqmp *39529 238712 0 0 7 0x14200 systq 6869 389203 0 0 3 0x40014200 bored softclock 12622 422796 0 0 3 0x40014200 idle0 1 460960 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82647710) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 uvm_pmr_freepages+0x126 sys/uvm/uvm_pmemrange.c:1254 #4 pmap_do_remove+0x68b sys/arch/amd64/amd64/pmap.c:1871 #5 uvm_map_teardown+0x195 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] #5 uvm_map_teardown+0x195 sys/uvm/uvm_map.c:2739 #6 uvmspace_free+0x86 sys/uvm/uvm_map.c:3646 #7 uvm_exit+0x29 sys/uvm/uvm_glue.c:297 #8 reaper+0x189 sys/kern/kern_exit.c:456 #9 proc_trampoline+0x1c Process 39529 (systq) thread 0xffff800020a189c0 (238712) exclusive rrwlock inode r = 0 (0xfffffd806b43f6f8) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:613 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #5 vn_closefile+0xc6 vn_close sys/kern/vfs_vnops.c:298 [inline] #5 vn_closefile+0xc6 sys/kern/vfs_vnops.c:614 #6 fdrop+0xc2 sys/kern/kern_descrip.c:1276 #7 closef+0x11c sys/kern/kern_descrip.c:1260 #8 unp_gc+0x172 sys/kern/uipc_usrreq.c:944 #9 taskq_thread+0x9c sys/kern/kern_task.c:369 #10 proc_trampoline+0x1c shared rwlock systq r = 0 (0xffffffff8248c010) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 taskq_thread+0x8f sys/kern/kern_task.c:368 #2 proc_trampoline+0x1c exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8267f3f0) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:435 #3 sleep_finish+0x113 sys/kern/kern_synch.c:417 #4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:446 [inline] #4 sleep_finish_all+0x32 sys/kern/kern_synch.c:206 #5 msleep+0x20e sys/kern/kern_synch.c:273 #6 taskq_next_work+0xbe sys/kern/kern_task.c:323 #7 taskq_thread+0xe5 sys/kern/kern_task.c:366 #8 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9470 6398K 6398K 78643K 10561 0 pcb 13 8K 8K 78643K 15 0 rtable 105 3K 3K 78643K 199 0 ifaddr 44 10K 10K 78643K 45 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1471 0 iov 0 0K 8K 78643K 2 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 76K 78643K 1222 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 4 9K 25K 78643K 40 0 proc 60 63K 95K 78643K 449 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 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 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 207 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 105 21K 22K 78643K 1029 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 4 0 NDP 6 0K 0K 78643K 10 0 temp 67 3035K 3099K 78643K 2060 0 kqueue 3 4K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 31 0 19 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 458 0 458 1 0 1 1 0 8 1 tcpcb 544 18 0 14 1 0 1 1 0 8 0 inpcb 280 52 0 45 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 13 0 0 1 0 1 1 0 8 0 pfstkey 112 13 0 0 1 0 1 1 0 8 0 pfstate 328 13 0 0 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1434 0 25 46 0 46 46 0 8 0 ffsino 272 1434 0 25 94 0 94 94 0 8 0 nchpl 144 1679 0 59 61 0 61 61 0 8 1 uvmvnodes 72 1478 0 0 27 0 27 27 0 8 0 vnodes 208 1478 0 0 78 0 78 78 0 8 0 namei 1024 4267 0 4267 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 4863 0 4863 2 1 1 2 0 8 1 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 255 0 225 4 0 4 4 0 8 0 futexpl 56 133 0 133 1 0 1 1 0 8 1 knotepl 112 53 0 34 1 0 1 1 0 8 0 kqueuepl 144 4 0 2 1 0 1 1 0 8 0 pipelkpl 48 74 0 64 1 0 1 1 0 8 0 pipepl 120 148 0 129 1 0 1 1 0 8 0 fdescpl 496 240 0 225 3 0 3 3 0 8 0 filepl 152 1167 0 1064 6 1 5 5 0 8 0 lockfpl 104 10 0 9 1 0 1 1 0 8 0 lockfspl 48 5 0 4 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 46 0 37 1 0 1 1 0 8 0 zombiepl 144 225 0 223 2 1 1 1 0 8 0 processpl 984 255 0 223 6 1 5 5 0 8 0 procpl 624 280 0 237 4 0 4 4 0 8 0 sockpl 400 102 0 81 4 1 3 3 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 157 0 0 19 0 19 19 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 202 0 0 13 0 13 13 0 8 0 bufpl 280 4065 0 173 278 0 278 278 0 8 0 anonpl 16 34813 0 22631 51 1 50 50 0 124 1 amapchunkpl 152 1170 0 1028 8 0 8 8 0 158 1 amappl16 192 799 0 151 33 0 33 33 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 2 0 2 2 2 0 1 0 8 0 amappl13 168 31 0 26 1 0 1 1 0 8 0 amappl12 160 4 0 3 2 1 1 1 0 8 0 amappl11 152 70 0 51 1 0 1 1 0 8 0 amappl10 144 17 0 10 1 0 1 1 0 8 0 amappl9 136 372 0 369 1 0 1 1 0 8 0 amappl8 128 297 0 286 1 0 1 1 0 8 0 amappl7 120 118 0 107 1 0 1 1 0 8 0 amappl6 112 23 0 21 1 0 1 1 0 8 0 amappl5 104 164 0 150 1 0 1 1 0 8 0 amappl4 96 511 0 477 2 1 1 2 0 8 0 amappl3 88 110 0 101 1 0 1 1 0 8 0 amappl2 80 980 0 904 3 1 2 3 0 8 0 amappl1 72 15358 0 14892 25 11 14 20 0 8 4 amappl 80 534 0 487 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 240 0 224 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 240 0 224 1 0 1 1 0 8 0 vmmpekpl 168 5850 0 5820 2 0 2 2 0 8 0 vmmpepl 168 36158 0 34298 108 8 100 100 0 357 17 vmsppl 368 239 0 223 2 0 2 2 0 8 0 pdppl 4096 488 0 446 6 0 6 6 0 8 0 pvpl 32 127502 0 112279 131 3 128 128 0 265 3 pmappl 232 239 0 223 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 166 0 5 5 0 5 5 0 8 0