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 *239196 67396 0 0x8000 0xc000000 1 syz-executor 397435 81394 0 0x14000 0x200 0 softnet0 db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b759e) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f847b,ffffffff834642c6,642,ffffffff83446654) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80002a37eb68,8000000,1) at process_stop+0x3fe cursig(ffff8000ffffc2a0,ffff80002a229988,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff8000ffffc2a0,ffff80002a229988,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff8000ffffc2a0) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80002a229ac0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80002a229ac0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8ae64ee6cd0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: 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{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b759e) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f847b,ffffffff834642c6,642,ffffffff83446654) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80002a37eb68,8000000,1) at process_stop+0x3fe cursig(ffff8000ffffc2a0,ffff80002a229988,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff8000ffffc2a0,ffff80002a229988,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff8000ffffc2a0) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80002a229ac0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80002a229ac0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8ae64ee6cd0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a2297a0 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff8000ffffc2a0 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xed5d99e978dde3b8 r11 0x78ec946168c68f92 r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff8129e415 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a229790 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=239196 pid=67396 tcnt=3 stat=onproc flags process=8000 proc=c000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=2 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffee2b0,0xffffffff83aaeea0 process=0xffff80002a37eb68 user=0xffff80002a224000, vmspace=0xfffffd806c6a2d70 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 67396 170848 39623 0 2 0x8008000 syz-executor 67396 98118 39623 0 4 0xc008000 syz-executor *67396 239196 39623 0 7 0xc008000 syz-executor 72854 126431 76999 0 2 0 syz-executor 72854 51388 76999 0 3 0x4000080 fsleep syz-executor 24853 121282 34513 0 2 0 syz-executor 24853 504224 34513 0 3 0x4000080 fsleep syz-executor 75525 490183 31809 0 2 0 syz-executor 75525 217147 31809 0 3 0x4000080 fsleep syz-executor 75525 333695 31809 0 3 0x4000080 fsleep syz-executor 80693 134537 83936 0 2 0 syz-executor 80693 252055 83936 0 3 0x4000080 ttyretype syz-executor 3598 157091 81212 0 2 0 syz-executor 3598 407654 81212 0 3 0x4000080 sbwait syz-executor 30287 378922 1 0 3 0x80 nanoslp init 81212 244608 9053 0 3 0x82 nanoslp syz-executor 75363 123323 9053 0 3 0x2 biowait syz-executor 39623 301709 9053 0 3 0x82 nanoslp syz-executor 83936 241985 9053 0 3 0x82 nanoslp syz-executor 95192 461248 9053 0 3 0x10000082 nanoslp syz-executor 34513 431214 9053 0 3 0x82 nanoslp syz-executor 31809 484362 9053 0 3 0x82 nanoslp syz-executor 76999 133679 9053 0 3 0x82 nanoslp syz-executor 9053 19762 1 0 2 0x82 syz-executor 96964 371224 0 0 3 0x14200 bored smr 41128 275627 0 0 2 0x14200 zerothread 17897 325926 0 0 3 0x14200 aiodoned aiodoned 67097 345471 0 0 3 0x14200 syncer update 82010 125410 0 0 3 0x14200 cleaner cleaner 14604 224052 0 0 3 0x14200 reaper reaper 37190 125388 0 0 3 0x14200 pgdaemon pagedaemon 66814 177329 0 0 3 0x14200 bored viomb 38726 147829 0 0 3 0x40014200 acpi0 acpi0 66067 112078 0 0 3 0x40014200 idle1 97978 453904 0 0 3 0x14200 bored softnet1 81394 397435 0 0 7 0x14200 softnet0 12447 459543 0 0 3 0x14200 smrbar systqmp 14148 493971 0 0 3 0x14200 bored systq 74116 452610 0 0 3 0x14200 tmoslp softclockmp 56223 303506 0 0 3 0x40014200 tmoslp softclock 42415 155356 0 0 3 0x40014200 idle0 1 388704 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff83adf5b8) #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 (0xffff80002a37ec80) #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 75363 (syz-executor) thread 0xffff8000fffef770 (123323) exclusive rrwlock inode r = 0 (0xfffffd806b3e0a08) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b3e0568) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #10 namei+0x7c5 sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 12447 (systqmp) thread 0xffff8000ffffea60 (459543) shared rwlock systqmp r = 0 (0xffffffff839230d8) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11059 12082K 12471K 166960K 12676 0 pcb 18 12K 12K 166960K 59 0 rtable 204 7K 9K 166960K 392 0 pf 40 19K 25K 166960K 164 0 ifaddr 38 6K 8K 166960K 53 0 ifgroup 51 2K 2K 166960K 75 0 sysctl 3 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 1593 0 iov 0 0K 16K 166960K 7 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1287 81K 81K 166960K 1544 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 57K 85K 166960K 319 0 proc 12 17K 196K 166960K 588 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 0 0K 0K 166960K 14 0 in_multi 85 6K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 451 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 119 78K 167K 166960K 4903 0 UVM aobj 73 6K 6K 166960K 74 0 pinsyscall 17 34K 100K 166960K 1520 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 9 0 NDP 11 0K 2K 166960K 34 0 temp 41 9115K 9178K 166960K 13578 0 kqueue 1 2K 26K 166960K 55 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 120 110 0 110 2 0 2 2 0 8 2 rtentry 176 118 0 29 6 0 6 6 0 8 0 unpcb 144 180 0 112 3 0 3 3 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 87 0 86 4 0 4 4 0 8 3 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 321 0 318 6 0 6 6 0 8 5 nd6 152 25 0 3 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 0 1 1 0 8 1 pfstscr 40 9 0 7 1 0 1 1 0 8 0 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 3 0 2 1 0 1 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 pfrktable 1344 7 0 3 1 0 1 1 0 8 0 pfanchor 1288 7 0 0 1 0 1 1 0 8 0 pftag 88 3 0 1 1 0 1 1 0 8 0 pfstitem 24 41 0 0 1 0 1 1 0 8 0 pfstkey 128 49 0 8 2 0 2 2 0 8 0 pfstate 448 43 0 4 5 0 5 5 0 8 0 pfrule 1360 26 0 20 2 1 1 2 0 8 0 rttmr 136 6 0 6 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 468 0 41 29 0 29 29 0 8 1 art_table 40 469 0 41 5 0 5 5 0 8 0 art_node 32 118 0 38 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 72 13 0 3 1 0 1 1 0 8 0 shmpl 112 71 0 1 3 0 3 3 0 8 1 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1946 0 478 93 0 93 93 0 8 0 ffsino 296 1946 0 478 114 0 114 114 0 8 0 nchpl 144 2397 0 693 64 0 64 64 0 8 0 vnodes 216 2129 0 0 119 0 119 119 0 8 0 namei 1024 7925 0 7925 2 0 2 2 0 8 2 percpumem 16 55 0 6 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 37 0 12 2 0 2 2 0 8 0 scxspl 216 12032 0 12031 6 3 3 3 1 8 2 plimitpl 152 54 0 44 1 0 1 1 0 8 0 sigapl 424 651 0 616 7 0 7 7 0 8 1 knotepl 120 632 0 0 20 0 20 20 0 8 0 kqueuepl 224 64 0 63 1 0 1 1 0 8 0 pipepl 344 138 0 111 3 0 3 3 0 8 0 fdescpl 528 634 0 616 3 0 3 3 0 8 0 filepl 160 3146 0 2918 12 0 12 12 0 8 2 lockfpl 104 81 0 80 1 0 1 1 0 8 0 lockfspl 48 37 0 36 1 0 1 1 0 8 0 sessionpl 144 29 0 27 1 0 1 1 0 8 0 pgrppl 48 40 0 29 1 0 1 1 0 8 0 ucredpl 104 381 0 378 1 0 1 1 0 8 0 zombiepl 144 617 0 616 1 0 1 1 0 8 0 processpl 1232 651 0 616 5 0 5 5 0 8 1 procpl 664 973 0 930 6 0 6 6 0 8 2 sockpl 752 622 0 551 8 0 8 8 0 8 0 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 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 131 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 146 0 0 10 0 10 10 0 8 0 bufpl 280 5739 0 105 403 0 403 403 0 8 0 anonpl 32 6836 0 0 56 0 56 56 0 246 0 amapchunkpl 152 14799 0 14478 23 0 23 23 0 158 8 amappl16 200 1951 0 1931 16 2 14 15 0 8 8 amappl15 192 43 0 43 1 1 0 1 0 8 0 amappl14 184 443 0 443 1 0 1 1 0 8 1 amappl13 176 129 0 129 1 0 1 1 0 8 1 amappl12 168 891 0 875 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 0 1 1 0 8 1 amappl10 152 68 0 68 1 0 1 1 0 8 1 amappl9 144 336 0 336 1 1 0 1 0 8 0 amappl8 136 111 0 110 1 0 1 1 0 8 0 amappl7 128 151 0 149 1 0 1 1 0 8 0 amappl6 120 153 0 153 1 0 1 1 0 8 1 amappl5 112 97 0 96 1 0 1 1 0 8 0 amappl4 104 313 0 311 1 0 1 1 0 8 0 amappl3 96 2838 0 2769 4 0 4 4 0 8 1 amappl2 88 567 0 559 2 0 2 2 0 8 0 amappl1 80 11392 0 11304 15 0 15 15 0 8 8 amappl 88 4056 0 3947 5 0 5 5 0 92 1 uvmvnodes 80 108 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 73 0 1 2 0 2 2 0 8 0 uaddrrnd 24 634 0 616 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 634 0 616 1 0 1 1 0 8 0 vmmpekpl 168 7148 0 7115 2 0 2 2 0 8 0 vmmpepl 168 49452 0 48707 88 0 88 88 0 357 45 vmsppl 488 633 0 616 5 0 5 5 0 8 1 rwobjpl 80 16934 0 16490 25 1 24 25 0 8 1 pdppl 4096 1275 0 1232 99 52 47 83 0 8 4 pvpl 32 12107 0 0 99 1 98 98 0 265 0 pmappl 256 633 0 616 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 278 0 56 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8393dff0) 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(ffffffff83a667c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a667c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a1d0970,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 taskq_next_work(ffff80000002c000,ffff80002a1d0b08) at taskq_next_work+0x8e sys/kern/kern_task.c:399 taskq_thread(ffff80000002c000) at taskq_thread+0x1d5 sys/kern/kern_task.c:439 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff8393dff0) 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(ffffffff83a667c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a667c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a1d0970,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 taskq_next_work(ffff80000002c000,ffff80002a1d0b08) at taskq_next_work+0x8e sys/kern/kern_task.c:399 taskq_thread(ffff80000002c000) at taskq_thread+0x1d5 sys/kern/kern_task.c:439 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b759e) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f847b,ffffffff834642c6,642,ffffffff83446654) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80002a37eb68,8000000,1) at process_stop+0x3fe cursig(ffff8000ffffc2a0,ffff80002a229988,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff8000ffffc2a0,ffff80002a229988,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff8000ffffc2a0) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80002a229ac0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80002a229ac0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8ae64ee6cd0, count: 7 ddb{1}>