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 *500548 86387 -1 0x8010 0xc000000 1 syz-executor 3583 77730 0 0x2 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b79a3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fa6b1,ffffffff8345e175,642,ffffffff834400f2) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80003c3d09c0,8000000,1) at process_stop+0x3fe cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff8000ffff27e0) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80003c3ca8c0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c3ca8c0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36df2e7bde0, 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(ffffffff834b79a3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fa6b1,ffffffff8345e175,642,ffffffff834400f2) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80003c3d09c0,8000000,1) at process_stop+0x3fe cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff8000ffff27e0) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80003c3ca8c0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c3ca8c0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36df2e7bde0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3ca5a0 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff8000ffff27e0 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa2781c08e690b6a r11 0xe508288cd7d23720 r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff817e0d95 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3ca590 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=500548 pid=86387 tcnt=3 stat=onproc flags process=8010 proc=c000000 runpri=32, usrpri=56, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=2 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3770,0xffff8000ffff3250 process=0xffff80003c3d09c0 user=0xffff80003c3c5000, vmspace=0xfffff7800f8ed5d8 estcpu=6, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99520 318142 97979 0 2 0 syz-executor 99520 3088 97979 0 2 0x4000000 syz-executor 20302 448213 77730 0 2 0 syz-executor 20302 19232 77730 0 3 0x4000080 piperd syz-executor 20302 427137 77730 0 3 0x4000080 kqread syz-executor 86387 345472 44988 -1 2 0x8008010 syz-executor 86387 207996 44988 -1 4 0xc008010 syz-executor *86387 500548 44988 -1 7 0xc008010 syz-executor 38563 100513 76341 0 2 0xc80 syz-executor 38563 367559 76341 0 3 0x4000000 smrbar syz-executor 35596 258537 89533 0 3 0x82 piperd syz-executor 76341 463756 89533 0 2 0xc82 syz-executor 30814 53638 89533 0 3 0x82 piperd syz-executor 99544 14885 89533 0 3 0x82 piperd syz-executor 77730 3583 89533 0 7 0x2 syz-executor 36114 103705 89533 0 2 0x10000c82 syz-executor 44988 43683 89533 0 2 0xc82 syz-executor 97979 480824 89533 0 2 0xc82 syz-executor 89533 439372 64424 0 2 0xc82 syz-executor 64424 308282 29666 0 3 0x10008a sigsusp ksh 29666 509731 38340 0 3 0x98 kqread sshd-session 38340 329994 52790 0 3 0x92 kqread sshd-session 61460 267360 1 0 3 0x100083 ttyin getty 52790 248337 1 0 3 0x88 kqread sshd 13720 157199 47055 74 3 0x1100092 bpf pflogd 47055 140145 1 0 3 0x80 sbwait pflogd 68076 519014 45044 73 3 0x1100090 kqread syslogd 45044 132431 1 0 3 0x100082 sbwait syslogd 96222 386108 1 0 3 0x100080 kqread resolvd 90598 305299 5282 77 3 0x100092 kqread dhcpleased 94767 439604 5282 77 3 0x100092 kqread dhcpleased 5282 162709 1 0 3 0x80 kqread dhcpleased 76450 314626 0 0 2 0x14200 smr 33881 477421 0 0 3 0x14200 pgzero zerothread 9707 66214 0 0 3 0x14200 aiodoned aiodoned 76669 186533 0 0 3 0x14200 syncer update 75790 34880 0 0 3 0x14200 cleaner cleaner 63181 344033 0 0 3 0x14200 reaper reaper 88188 384183 0 0 3 0x14200 pgdaemon pagedaemon 70936 133668 0 0 3 0x14200 bored viomb 6134 311863 0 0 3 0x40014200 acpi0 acpi0 24838 272337 0 0 3 0x40014200 idle1 53142 122219 0 0 3 0x14200 bored softnet1 79181 332664 0 0 3 0x14200 bored softnet0 53583 7852 0 0 3 0x14200 bored systqmp 2125 21346 0 0 3 0x14200 bored systq 56198 220751 0 0 3 0x14200 tmoslp softclockmp 7828 420744 0 0 3 0x40014200 tmoslp softclock 19250 270350 0 0 3 0x40014200 idle0 1 46678 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff83aa9d48) #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 (0xffff80003c3d0ad8) #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 38563 (syz-executor) thread 0xffff8000fffeaa80 (367559) exclusive rwlock clonelk r = 0 (0xffffffff838f47b8) #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 fifo_ioctl+0x12f sys/miscfs/fifofs/fifo_vnops.c:314 #5 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #6 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537 #7 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11054 12085K 12101K 166960K 12149 0 pcb 21 12K 12K 166960K 28 0 rtable 237 6K 7K 166960K 351 0 pf 34 17K 18K 166960K 45 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1484 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1366 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 93K 166960K 143 0 proc 70 115K 164K 166960K 552 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 4 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 4 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 382 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 214 177K 187K 166960K 3122 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 39 78K 104K 166960K 1299 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 2K 166960K 28 0 temp 34 9110K 9126K 166960K 3920 0 kqueue 15 24K 24K 166960K 30 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 33 0 30 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 46 0 25 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 10 0 6 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 78 0 66 1 0 1 1 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 pfstitem 24 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 448 20 0 0 3 0 3 3 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 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 semapl 72 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1594 0 124 93 0 93 93 0 8 0 ffsino 296 1594 0 124 114 0 114 114 0 8 0 nchpl 144 1800 0 98 64 0 64 64 0 8 0 vnodes 216 1680 0 0 94 0 94 94 0 8 0 namei 1024 5505 0 5505 2 0 2 2 0 8 2 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 6215 0 6215 4 2 2 3 1 8 2 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 460 0 415 7 0 7 7 0 8 1 knotepl 120 54 0 0 2 0 2 2 0 8 0 kqueuepl 224 30 0 18 1 0 1 1 0 8 0 pipepl 344 127 0 99 3 0 3 3 0 8 0 fdescpl 528 444 0 416 3 0 3 3 0 8 0 filepl 160 1627 0 1402 10 0 10 10 0 8 0 lockfpl 104 9 0 6 1 0 1 1 0 8 0 lockfspl 48 6 0 3 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 101 0 87 1 0 1 1 0 8 0 zombiepl 144 416 0 415 1 0 1 1 0 8 0 processpl 1232 460 0 415 5 0 5 5 0 8 0 procpl 664 481 0 430 5 0 5 5 0 8 0 sockpl 752 157 0 121 4 0 4 4 0 8 0 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 163 0 0 10 0 10 10 0 8 0 bufpl 280 2362 0 105 162 0 162 162 0 8 0 anonpl 32 3790 0 0 31 0 31 31 0 246 0 amapchunkpl 152 8762 0 8169 23 0 23 23 0 158 0 amappl16 200 1776 0 1759 5 1 4 5 0 8 2 amappl15 192 17 0 17 1 1 0 1 0 8 0 amappl14 184 430 0 429 1 0 1 1 0 8 0 amappl13 176 135 0 123 1 0 1 1 0 8 0 amappl12 168 696 0 669 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 68 0 54 1 0 1 1 0 8 0 amappl9 144 277 0 276 1 0 1 1 0 8 0 amappl8 136 100 0 98 1 0 1 1 0 8 0 amappl7 128 185 0 172 1 0 1 1 0 8 0 amappl6 120 159 0 157 1 0 1 1 0 8 0 amappl5 112 115 0 105 1 0 1 1 0 8 0 amappl4 104 292 0 272 1 0 1 1 0 8 0 amappl3 96 1497 0 1403 3 0 3 3 0 8 0 amappl2 88 538 0 478 2 0 2 2 0 8 0 amappl1 80 10477 0 9875 15 0 15 15 0 8 0 amappl 88 2394 0 2254 4 0 4 4 0 92 0 uvmvnodes 80 101 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 444 0 416 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 444 0 416 1 0 1 1 0 8 0 vmmpekpl 168 5811 0 5777 2 0 2 2 0 8 0 vmmpepl 168 38234 0 36488 87 0 87 87 0 357 5 vmsppl 488 443 0 416 5 0 5 5 0 8 1 rwobjpl 80 14626 0 13626 25 0 25 25 0 8 3 pdppl 4096 895 0 832 97 26 71 85 0 8 8 pvpl 32 11706 0 0 97 2 95 95 0 265 0 pmappl 256 443 0 416 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 270 0 29 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff839d1ff0) 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(ffffffff83aaa900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aaa900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80002a308c50) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a308c50) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76ec76f2e120, count: 9 ddb{0}> trace x86_ipi_db(ffffffff839d1ff0) 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(ffffffff83aaa900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aaa900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80002a308c50) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a308c50) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76ec76f2e120, count: -6 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(ffffffff834b79a3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fa6b1,ffffffff8345e175,642,ffffffff834400f2) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80003c3d09c0,8000000,1) at process_stop+0x3fe cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff8000ffff27e0) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80003c3ca8c0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c3ca8c0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36df2e7bde0, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b79a3) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fa6b1,ffffffff8345e175,642,ffffffff834400f2) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff80003c3d09c0,8000000,1) at process_stop+0x3fe cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff8000ffff27e0,ffff80003c3ca788,0) at cursig+0x509 sys/kern/kern_sig.c:1445 userret(ffff8000ffff27e0) at userret+0x203 sys/kern/kern_sig.c:2207 syscall(ffff80003c3ca8c0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c3ca8c0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x36df2e7bde0, count: -8