panic: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *358246 62776 60928 0x8010 0xc000000 0 syz-executor 488811 23199 0 0 0x4000000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bad2d) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f8f1c,ffffffff8346128c,642,ffffffff8344329e) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80002a37c9b8,8000000,1) at process_stop+0x3fe cursig(ffff80003abb8550,ffff80003c3c4f38,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff80003abb8550,ffff80003c3c4f38,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff80003abb8550) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80003c3c5070) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c3c5070) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc7206a88d40, count: 7 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 *cpu0: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bad2d) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f8f1c,ffffffff8346128c,642,ffffffff8344329e) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80002a37c9b8,8000000,1) at process_stop+0x3fe cursig(ffff80003abb8550,ffff80003c3c4f38,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff80003abb8550,ffff80003c3c4f38,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff80003abb8550) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80003c3c5070) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c3c5070) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc7206a88d40, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3c4d50 rbx 0xffffffff83999e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80003abb8550 rax 0xffffffff83998ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x554fc309817431ca r11 0x4ae11bc9ea1c9d54 r12 0xffffffff83999c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff8279a8d5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3c4d40 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=358246 pid=62776 tcnt=3 stat=onproc flags process=8010 proc=c000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=2 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003abb8020,0xffffffff83aa6478 process=0xffff80002a37c9b8 user=0xffff80003c3c0000, vmspace=0xfffff7806c6d7b88 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 62776 276957 45402 60928 2 0x8008010 syz-executor 62776 468488 45402 60928 4 0xc008010 syz-executor *62776 358246 45402 60928 7 0xc008010 syz-executor 82028 120302 58130 0 3 0x80 fsleep syz-executor 82028 139094 58130 0 3 0x4000080 lockf syz-executor 98231 481156 64578 0 3 0x80 fsleep syz-executor 98231 379738 64578 0 3 0x4000080 netcon syz-executor 42087 152108 20662 0 3 0x80 fsleep syz-executor 42087 189584 20662 0 3 0x4000080 kqsel syz-executor 23199 152681 51840 0 2 0 syz-executor 23199 488811 51840 0 7 0x4000000 syz-executor 23199 322591 51840 0 3 0x4000080 fsleep syz-executor 52385 135837 10845 0 3 0x3000 suspend syz-executor 52385 336159 10845 0 3 0x4081000 smrbar syz-executor 69954 12043 6477 0 3 0x80 nanoslp syz-executor 69954 59625 6477 0 3 0x4000080 ttyin syz-executor 69954 279795 6477 0 3 0x4000000 inode syz-executor 69954 135475 6477 0 3 0x4000080 fsleep syz-executor 31969 187793 20696 0 3 0x80 nanoslp syz-executor 31969 421653 20696 0 3 0x4000080 kqsel syz-executor 31969 520442 20696 0 3 0x4000080 fsleep syz-executor 58130 158623 84130 0 3 0x82 nanoslp syz-executor 45402 210353 84130 0 3 0x82 nanoslp syz-executor 10845 145049 84130 0 3 0x82 nanoslp syz-executor 64578 291294 84130 0 3 0x82 nanoslp syz-executor 20662 328120 84130 0 3 0x82 nanoslp syz-executor 20696 194085 84130 0 3 0x82 nanoslp syz-executor 51840 114087 84130 0 3 0x82 nanoslp syz-executor 6477 341264 84130 0 3 0x82 nanoslp syz-executor 84130 95934 22495 0 3 0x82 kqread syz-executor 22495 391606 78694 0 3 0x10008a sigsusp ksh 78694 17027 99428 0 3 0x98 kqread sshd-session 99428 389903 78336 0 3 0x92 kqread sshd-session 40214 139497 1 0 3 0x100083 ttyin getty 78336 418288 1 0 3 0x88 kqread sshd 77368 495735 13434 74 3 0x1100092 bpf pflogd 13434 267655 1 0 3 0x80 sbwait pflogd 88354 211224 56914 73 3 0x1100090 kqread syslogd 56914 429381 1 0 3 0x100082 sbwait syslogd 24527 100631 1 0 3 0x100080 kqread resolvd 85510 184750 5341 77 3 0x100092 kqread dhcpleased 53432 20054 5341 77 3 0x100092 kqread dhcpleased 5341 483118 1 0 3 0x80 kqread dhcpleased 38211 397651 0 0 3 0x14200 bored smr 12702 71720 0 0 3 0x14200 pgzero zerothread 35262 504325 0 0 3 0x14200 aiodoned aiodoned 89279 517165 0 0 3 0x14200 syncer update 30252 138227 0 0 3 0x14200 cleaner cleaner 9586 41431 0 0 3 0x14200 reaper reaper 80622 317539 0 0 3 0x14200 pgdaemon pagedaemon 31345 299677 0 0 3 0x14200 bored viomb 24624 438549 0 0 3 0x40014200 acpi0 acpi0 79709 465480 0 0 3 0x40014200 idle1 91949 283033 0 0 3 0x14200 bored softnet1 62294 125953 0 0 3 0x14200 bored softnet0 24028 246170 0 0 3 0x14200 smrbar systqmp 27088 471901 0 0 3 0x14200 bored systq 17944 24194 0 0 3 0x14200 tmoslp softclockmp 95229 126539 0 0 3 0x40014200 tmoslp softclock 86652 521352 0 0 3 0x40014200 idle0 1 57913 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &sched_lock r = 0 (0xffffffff83aaa738) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 cursig+0x4ee sys/kern/kern_sig.c:1444 #3 userret+0x203 sys/kern/kern_sig.c:2207 #4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] #4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 #5 Xsyscall+0x128 exclusive mutex &pr->ps_mtx r = 0 (0xffff80002a37cad0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 cursig+0x4c2 sys/kern/kern_sig.c:1440 #3 userret+0x203 sys/kern/kern_sig.c:2207 #4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] #4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 #5 Xsyscall+0x128 Process 52385 (syz-executor) thread 0xffff80003abb2028 (336159) exclusive rwlock clonelk r = 0 (0xffffffff839d1798) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 if_clone_destroy+0x93 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2160 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 69954 (syz-executor) thread 0xffff8000fffeed10 (59625) exclusive rrwlock inode r = 0 (0xfffff7806a0458e0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 spec_open+0x2f2 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x7a5 sys/kern/vfs_vnops.c:183 #8 vndioctl+0xc43 sys/dev/vnd.c:458 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537 #11 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #12 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 69954 (syz-executor) thread 0xffff8000fffef4d8 (279795) exclusive rrwlock inode r = 0 (0xfffff7806a045b30) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 uipc_bind+0x328 sys/kern/uipc_usrreq.c:371 #8 sys_bind+0x2f6 sys/kern/uipc_syscalls.c:190 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #10 Xsyscall+0x128 Process 24028 (systqmp) thread 0xffff8000ffffe000 (246170) shared rwlock systqmp r = 0 (0xffffffff839c37c8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11071 12217K 12225K 166960K 12233 0 pcb 18 12K 12K 166960K 37 0 rtable 239 6K 7K 166960K 362 0 pf 37 18K 22K 166960K 73 0 ifaddr 43 7K 7K 166960K 46 0 ifgroup 55 2K 2K 166960K 60 0 sysctl 4 1K 9K 166960K 8 0 counters 70 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1497 0 iov 0 0K 0K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1300 82K 82K 166960K 1445 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 207 0 proc 72 115K 164K 166960K 571 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 4 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 394 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 258 168K 178K 166960K 3617 0 UVM aobj 9 4K 4K 166960K 9 0 pinsyscall 43 86K 108K 166960K 1363 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 3 0 NDP 12 0K 2K 166960K 29 0 temp 41 9115K 9122K 166960K 6851 0 kqueue 22 32K 32K 166960K 40 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 34 0 31 1 0 1 1 0 8 0 rtentry 176 116 0 5 6 0 6 6 0 8 0 unpcb 144 72 0 52 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 23 0 16 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 115 0 96 2 0 2 2 0 8 0 nd6 152 26 0 1 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfstscr 40 4 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 1 1 0 1 1 0 482 1 pffrnode 88 1 0 1 1 0 1 1 0 8 1 pffrent 40 3 0 3 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 29 0 1 1 0 1 1 0 8 0 pfstkey 128 29 0 1 1 0 1 1 0 8 0 pfstate 448 27 0 1 3 0 3 3 0 8 0 pfrule 1360 25 0 16 2 1 1 2 0 8 0 rttmr 136 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 499 0 32 31 0 31 31 0 8 1 art_table 40 500 0 32 5 0 5 5 0 8 0 art_node 32 116 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semapl 72 5 0 1 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1684 0 213 93 0 93 93 0 8 0 ffsino 296 1684 0 213 114 0 114 114 0 8 0 nchpl 144 1995 0 283 64 0 64 64 0 8 0 vnodes 216 1844 0 0 103 0 103 103 0 8 0 namei 1024 6228 0 6227 2 0 2 2 0 8 1 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 29 0 2 2 0 2 2 0 8 0 scxspl 216 6729 0 6729 4 3 1 3 1 8 1 plimitpl 152 33 0 16 1 0 1 1 0 8 0 sigapl 424 524 0 476 7 0 7 7 0 8 1 knotepl 120 308 0 0 10 0 10 10 0 8 0 kqueuepl 224 44 0 26 2 0 2 2 0 8 0 pipepl 344 130 0 102 3 0 3 3 0 8 0 fdescpl 528 508 0 476 3 0 3 3 0 8 0 filepl 160 1951 0 1700 11 0 11 11 0 8 0 lockfpl 104 29 0 25 1 0 1 1 0 8 0 lockfspl 48 14 0 11 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 38 0 20 1 0 1 1 0 8 0 ucredpl 104 145 0 130 1 0 1 1 0 8 0 zombiepl 144 477 0 476 1 0 1 1 0 8 0 processpl 1232 524 0 476 5 0 5 5 0 8 1 procpl 664 650 0 589 6 0 6 6 0 8 0 sockpl 752 222 0 180 5 0 5 5 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 133 0 0 9 0 9 9 0 8 0 bufpl 272 2475 0 105 158 0 158 158 0 8 0 anonpl 32 3606 0 0 30 0 30 30 0 246 0 amapchunkpl 152 10237 0 9675 28 0 28 28 0 158 6 amappl16 200 1183 0 1156 4 1 3 4 0 8 1 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 432 0 431 1 0 1 1 0 8 0 amappl13 176 124 0 112 1 0 1 1 0 8 0 amappl12 168 758 0 727 2 0 2 2 0 8 0 amappl11 160 6 0 6 2 2 0 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 275 0 275 1 1 0 1 0 8 0 amappl8 136 125 0 121 1 0 1 1 0 8 0 amappl7 128 146 0 133 1 0 1 1 0 8 0 amappl6 120 154 0 153 1 0 1 1 0 8 0 amappl5 112 109 0 99 1 0 1 1 0 8 0 amappl4 104 290 0 269 1 0 1 1 0 8 0 amappl3 96 1934 0 1804 4 0 4 4 0 8 0 amappl2 88 539 0 477 2 0 2 2 0 8 0 amappl1 80 10720 0 10110 15 0 15 15 0 8 2 amappl 88 2887 0 2701 5 0 5 5 0 92 0 uvmvnodes 80 103 0 0 3 0 3 3 0 8 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 508 0 476 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 508 0 476 1 0 1 1 0 8 0 vmmpekpl 168 6147 0 6114 2 0 2 2 0 8 0 vmmpepl 168 40933 0 38942 89 0 89 89 0 357 2 vmsppl 488 507 0 476 5 0 5 5 0 8 1 rwobjpl 80 14565 0 13489 24 0 24 24 0 8 0 pdppl 4096 1023 0 952 99 26 73 87 0 8 2 pvpl 32 10899 0 0 88 0 88 88 0 265 0 pmappl 256 507 0 476 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 430 0 29 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bad2d) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f8f1c,ffffffff8346128c,642,ffffffff8344329e) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80002a37c9b8,8000000,1) at process_stop+0x3fe cursig(ffff80003abb8550,ffff80003c3c4f38,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff80003abb8550,ffff80003c3c4f38,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff80003abb8550) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80003c3c5070) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c3c5070) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc7206a88d40, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83b0bd80) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83b0bd80) at __mp_lock+0x199 sys/kern/kern_lock.c:173 knote_remove(ffff80003abb8a80,fffff7806f372b60,fffff7806f372bf0,3,0) at knote_remove+0x198 filter_detach sys/kern/kern_event.c:1043 [inline] knote_remove(ffff80003abb8a80,fffff7806f372b60,fffff7806f372bf0,3,0) at knote_remove+0x198 sys/kern/kern_event.c:2172 knote_fdclose(ffff80003abb8a80,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2221 fdrelease(ffff80003abb8a80,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 sys_closefrom(ffff80003abb8a80,ffff80003c3dd100,ffff80003c3dd050) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c3dd100) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3dd100) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x93fbbeb8560, count: 5 ddb{1}> trace x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83b0bd80) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83b0bd80) at __mp_lock+0x199 sys/kern/kern_lock.c:173 knote_remove(ffff80003abb8a80,fffff7806f372b60,fffff7806f372bf0,3,0) at knote_remove+0x198 filter_detach sys/kern/kern_event.c:1043 [inline] knote_remove(ffff80003abb8a80,fffff7806f372b60,fffff7806f372bf0,3,0) at knote_remove+0x198 sys/kern/kern_event.c:2172 knote_fdclose(ffff80003abb8a80,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2221 fdrelease(ffff80003abb8a80,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 sys_closefrom(ffff80003abb8a80,ffff80003c3dd100,ffff80003c3dd050) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c3dd100) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3dd100) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x93fbbeb8560, count: -10