syzbot


assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c

Status: upstream: reported on 2026/04/30 00:50
Reported-by: syzbot+65bf0a9d1cc48d8c3760@syzkaller.appspotmail.com
First crash: 45d, last: 1h28m

Sample crash report:
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
*482391  22645     -1  0x40009010  0xc080000    0  syz-executor
 441236  39268      0     0x14000      0x200    1  reaper
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(ffff8000fffe1838,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffe6fc0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff8000333a0310) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000333a0310) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x163ad84b30, count: 7
https://www.openbsd.org/ddb.html describes the minimum info required in bug
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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(ffff8000fffe1838,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffe6fc0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff8000333a0310) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000333a0310) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x163ad84b30, count: -8
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80003339fff0
rbx               0xffffffff83999e07    cpu_info_full_primary+0x2e07
rdx                                0
rcx               0xffff8000fffe6fc0
rax               0xffffffff83998ff0    cpu_info_full_primary+0x1ff0
r8                 0x101010101010101
r9                0x8080808080808080
r10               0x1ada5ff2a661ad7a
r11               0xbd51997d2ba702dd
r12               0xffffffff83999c08    cpu_info_full_primary+0x2c08
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff8279a8d5    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80003339ffe0
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=482391 pid=22645 tcnt=2 stat=onproc
    flags process=40009010<SUGID,SINGLEEXIT,STOPPING,STOPPED> proc=c080000<SUSPSINGLE,THREAD,SUSPSIG>
    runpri=56, usrpri=54, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0xffff8000fffe6d28 scnt=1 ecnt=1
    forw=0xffffffffffffffff, list=0xffff8000fffe62c8,0xffff8000fffe6d38
    process=0xffff8000fffe1838 user=0xffff80003339b000, vmspace=0xfffff5806c3dc208
    estcpu=4, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 92156  238183  18350      0  2           0                syz-executor
 92156   84203  18350      0  3   0x4000080  fsleep        syz-executor
 38795  507414  30859      0  2           0                syz-executor
 38795  326263  30859      0  2   0x4000000                syz-executor
 46927  264333  69848      0  3      0x3000  suspend       syz-executor
 46927  433271  69848      0  3   0x4081000  fltagain2     syz-executor
 75218  486110  54706     -1  2        0x10                syz-executor
 75218   87565  54706     -1  3   0x4000090  fsleep        syz-executor
 75218   36046  54706     -1  3   0x4000090  fsleep        syz-executor
 75218  100071  54706     -1  3   0x4000090  fsleep        syz-executor
*22645  482391  64418     -1  7  0x4c089010                syz-executor
 22645  212380  64418     -1  3  0x4400b010  suspend       syz-executor
 23199  293122      0      0  3     0x14280  nfsidl        nfsio
 98236  380992      0      0  3     0x14280  nfsidl        nfsio
 52918  292512      0      0  3     0x14280  nfsidl        nfsio
 91105  341987      0      0  3     0x14280  nfsidl        nfsio
 81874  140110      0      0  3     0x14280  nfsidl        nfsio
 88933  367901      0      0  3     0x14280  nfsidl        nfsio
 49898  198105      0      0  3     0x14280  nfsidl        nfsio
 26964  159523      0      0  3     0x14280  nfsidl        nfsio
 77822  191967      0      0  3     0x14280  nfsidl        nfsio
 75171  229243      0      0  3     0x14280  nfsidl        nfsio
 40346  277014      0      0  3     0x14280  nfsidl        nfsio
 58849  317982      0      0  3     0x14280  nfsidl        nfsio
 41697  281298      0      0  3     0x14280  nfsidl        nfsio
  5854  256036      0      0  3     0x14280  nfsidl        nfsio
 69959    1767      0      0  3     0x14280  nfsidl        nfsio
 45682  478997      0      0  3     0x14280  nfsidl        nfsio
 65774  273713      0      0  3     0x14280  nfsidl        nfsio
  6050  227540      0      0  3     0x14280  nfsidl        nfsio
 20370  142183      0      0  3     0x14280  nfsidl        nfsio
 97020   20849      0      0  3     0x14280  nfsidl        nfsio
 18350  163722   2869      0  3        0x82  nanoslp       syz-executor
 16942   41226   2869      0  2  0x10000c82                syz-executor
 64418  100976   2869      0  3        0x82  wait          syz-executor
 54706    8419   2869      0  2       0xc82                syz-executor
 88111  151935   2869      0  3        0x82  wait          syz-executor
 30859  480693   2869      0  3        0x82  nanoslp       syz-executor
 69848  518093   2869      0  2         0x2                syz-executor
  9235  500398   2869      0  2         0x2                syz-executor
  2869  491684  84560      0  3        0x82  kqread        syz-executor
 84560  191645  79884      0  3    0x10008a  sigsusp       ksh
 79884  490742  81477      0  3        0x98  kqread        sshd-session
 81477  521387  57150      0  3        0x92  kqread        sshd-session
 88743  236402      1      0  3    0x100083  ttyin         getty
 57150   30210      1      0  3        0x88  kqread        sshd
 63140  423696  86385     74  3   0x1100092  bpf           pflogd
 86385  277305      1      0  3        0x80  sbwait        pflogd
 33424  176354  53260     73  3   0x1100090  kqread        syslogd
 53260  516558      1      0  3    0x100082  sbwait        syslogd
  3910  183147      1      0  3    0x100080  kqread        resolvd
 72975  192210  53159     77  3    0x100092  kqread        dhcpleased
 38066  244755  53159     77  3    0x100092  kqread        dhcpleased
 53159  368250      1      0  3        0x80  kqread        dhcpleased
 41662  254147      0      0  3     0x14200  bored         smr
 15464  314623      0      0  2     0x14200                zerothread
 88447   81596      0      0  3     0x14200  aiodoned      aiodoned
  8783  155752      0      0  3     0x14200  syncer        update
 20981  304765      0      0  3     0x14200  cleaner       cleaner
 39268  441236      0      0  7     0x14200                reaper
 99605   97148      0      0  3     0x14200  pgdaemon      pagedaemon
 17605  409769      0      0  3     0x14200  bored         viomb
 19991  490163      0      0  3  0x40014200  acpi0         acpi0
  2394  394572      0      0  3  0x40014200                idle1
  7840  187829      0      0  3     0x14200  bored         softnet1
 88493  272138      0      0  3     0x14200  bored         softnet0
 24926  217198      0      0  3     0x14200  bored         systqmp
 21189  274916      0      0  3     0x14200  bored         systq
 31757  298205      0      0  3     0x14200  tmoslp        softclockmp
 51254  263274      0      0  3  0x40014200  tmoslp        softclock
 24313  493036      0      0  3  0x40014200                idle0
     1  402183      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 (0xffff8000fffe1950)
#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 9235 (syz-executor) thread 0xffff80002a222010 (500398)
exclusive rrwlock inode r = 0 (0xfffff58072bcc7b8)
#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:1806
#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 (0xfffff580728d70b0)
#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  dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806
#8  syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8  syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9  Xsyscall+0x128
ddb{0}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11057  12093K   13131K 166960K     12385        0
            pcb    18     13K      14K 166960K        73        0
         rtable   230      7K      10K 166960K       372        0
             pf    35     17K      24K 166960K        84        0
         ifaddr    42      7K       7K 166960K        47        0
        ifgroup    55      2K       2K 166960K        59        0
         sysctl     3      1K       9K 166960K         8        0
       counters    70     37K      37K 166960K        76        0
       ioctlops     0      0K       4K 166960K      1498        0
            iov     0      0K       1K 166960K         2        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1328     84K      84K 166960K      1463        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    10      0K       0K 166960K        15        0
        dirhash    12      2K       2K 166960K        12        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    16     57K      93K 166960K       216        0
          sigio     0      0K       0K 166960K         1        0
           proc    72    115K     164K 166960K       557        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        46        0
       in_multi    95      7K       7K 166960K       100        0
    ether_multi     1      0K       0K 166960K         1        0
            mrt     0      0K       0K 166960K        10        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    61    281K     281K 166960K        61        0
           exec     0      0K       1K 166960K       387        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   235    175K     185K 166960K      3765        0
       UVM aobj     6      2K       2K 166960K         8        0
     pinsyscall    41     82K     103K 166960K      1372        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
            NDP    12      0K       2K 166960K        30        0
           temp    35   9110K    9158K 166960K      5877        0
         kqueue    13     20K      26K 166960K        43        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       40    0       35     1     0     1     1     0     8    0
rtentry    176      112    0        7     5     0     5     5     0     8    0
unpcb      144       96    0       76     2     0     2     2     0     8    1
syncache   336        4    0        4     1     1     0     1     0     8    0
tcpcb      736       60    0       56     4     0     4     4     0     8    3
arp        136       18    0        0     1     0     1     1     0     8    0
inpcb      328      196    0      186     7     0     7     7     0     8    6
nd6        152       24    0        2     1     0     1     1     0     8    0
kcovpl      48        8    0        0     1     0     1     1     0     8    0
ppxss      1192       3    0        3     1     0     1     1     0     8    1
pfstscr     40        2    0        2     1     0     1     1     0     8    1
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
pfrktable  1344       7    0        7     1     0     1     1     0     8    1
pfstlim    224        1    0        1     1     0     1     1     0     8    1
pfanchor   1288      11    0        2     1     0     1     1     0     8    0
pftag       88        2    0        2     1     0     1     1     0     8    1
pfstitem    24       24    0        0     1     0     1     1     0     8    0
pfstkey    128       26    0        2     1     0     1     1     0     8    0
pfstate    448       25    0        1     3     0     3     3     0     8    0
pfrule     1360      22    0       17     2     1     1     2     0     8    0
rttmr      136        1    0        1     1     0     1     1     0     8    1
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      452    0       16    29     0    29    29     0     8    0
art_table   40      453    0       16     5     0     5     5     0     8    0
art_node    32      112    0       16     1     0     1     1     0     8    0
sysvmsgpl   40        1    0        1     1     0     1     1     0     8    1
semupl     112        2    0        2     1     0     1     1     0     8    1
semapl      72       13    0        5     1     0     1     1     0     8    0
shmpl      112        5    0        2     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1716    0      247    93     0    93    93     0     8    0
ffsino     296     1716    0      247   114     0   114   114     0     8    0
nchpl      144     2024    0      318    64     0    64    64     0     8    0
vnodes     216     1879    0        0   105     0   105   105     0     8    0
namei      1024    6382    0     6382     2     0     2     2     0     8    2
percpumem   16       53    0        3     1     0     1     1     0     8    0
pfiaddrpl  120        2    0        2     1     0     1     1     0     8    1
kstatmem   264       31    0        4     2     0     2     2     0     8    0
scsiplug    72        2    0        2     1     0     1     1     0     8    1
scxspl     216     7279    0     7279     3     2     1     2     1     8    1
plimitpl   152       76    0       58     1     0     1     1     0     8    0
sigapl     424      553    0      486     8     0     8     8     0     8    0
knotepl    120      310    0        0    10     0    10    10     0     8    0
kqueuepl   224       83    0       73     3     0     3     3     0     8    2
pipepl     344      134    0      107     3     0     3     3     0     8    0
fdescpl    528      517    0      487     3     0     3     3     0     8    0
filepl     160     2273    0     2047    13     0    13    13     0     8    3
lockfpl    104       62    0       58     1     0     1     1     0     8    0
lockfspl    48       30    0       26     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      224    0      209     1     0     1     1     0     8    0
zombiepl   144      489    0      486     1     0     1     1     0     8    0
processpl  1232     553    0      486     6     0     6     6     0     8    0
procpl     664      726    0      651     8     0     8     8     0     8    1
sockpl     752      332    0      297    11     0    11    11     0     8    7
mcl64k     65536      4    0        0     1     0     1     1     0     8    0
mcl16k     16384      2    0        0     1     0     1     1     0     8    0
mcl8k      8192       1    0        0     1     0     1     1     0     8    0
mcl4k      4096     127    0        0    16     0    16    16     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      259    0        0    17     0    17    17     0     8    0
bufpl      272     2668    0      106   171     0   171   171     0     8    0
anonpl      32     7454    0        0    61     0    61    61     0   246    0
amapchunkpl 152   10690    0    10228    22     0    22    22     0   158    1
amappl16   200     2228    0     2202    15     1    14    15     0     8   10
amappl15   192        7    0        7     1     1     0     1     0     8    0
amappl14   184      435    0      433     1     0     1     1     0     8    0
amappl13   176      125    0      113     1     0     1     1     0     8    0
amappl12   168      768    0      739     2     0     2     2     0     8    0
amappl11   160        6    0        6     1     1     0     1     0     8    0
amappl10   152       66    0       52     1     0     1     1     0     8    0
amappl9    144      276    0      276     1     1     0     1     0     8    0
amappl8    136       96    0       94     1     0     1     1     0     8    0
amappl7    128      146    0      133     1     0     1     1     0     8    0
amappl6    120      155    0      154     1     0     1     1     0     8    0
amappl5    112       96    0       86     1     0     1     1     0     8    0
amappl4    104      286    0      268     1     0     1     1     0     8    0
amappl3     96     2005    0     1899     4     0     4     4     0     8    0
amappl2     88      540    0      479     2     0     2     2     0     8    0
amappl1     80    10777    0    10172    15     0    15    15     0     8    2
amappl      88     3036    0     2875     5     0     5     5     0    92    0
uvmvnodes   80      105    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        7    0        2     1     0     1     1     0     8    0
uaddrrnd    24      517    0      487     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      517    0      487     1     0     1     1     0     8    0
vmmpekpl   168     6309    0     6277     2     0     2     2     0     8    0
vmmpepl    168    42494    0    40631    95     0    95    95     0   357    8
vmsppl     488      516    0      487     5     0     5     5     0     8    1
rwobjpl     80    15900    0    14874    27     0    27    27     0     8    2
pdppl      4096    1041    0      974    99    28    71    85     0     8    4
pvpl        32    15173    0        0   123     0   123   123     0   265    0
pmappl     256      516    0      487     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      453    0       32    13     0    13    13     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(ffff8000fffe1838,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffe6fc0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff8000333a0310) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000333a0310) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x163ad84b30, 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
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153
mtx_leave(ffffffff839baaa0) at mtx_leave+0x28 sys/kern/kern_lock.c:-1
msleep_nsec(ffffffff839baad8,ffffffff839baaa0,4,ffffffff834ccf90,ffffffffffffffff) at msleep_nsec+0x19b sys/kern/kern_synch.c:202
reaper(ffff8000ffffd760) at reaper+0x15b sys/kern/kern_exit.c:477
end trace frame: 0x0, count: 8
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
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153
mtx_leave(ffffffff839baaa0) at mtx_leave+0x28 sys/kern/kern_lock.c:-1
msleep_nsec(ffffffff839baad8,ffffffff839baaa0,4,ffffffff834ccf90,ffffffffffffffff) at msleep_nsec+0x19b sys/kern/kern_synch.c:202
reaper(ffff8000ffffd760) at reaper+0x15b sys/kern/kern_exit.c:477
end trace frame: 0x0, count: -7

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/14 00:13 openbsd 4abe9ebbcc38 4f06757f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/06/13 19:08 openbsd 4abe9ebbcc38 4f06757f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/06/13 14:10 openbsd 4abe9ebbcc38 4f06757f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/06/10 18:18 openbsd 01c8afc2223d f79bac11 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/06/08 22:53 openbsd 867bf89e0da6 656e94c6 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/06/06 00:34 openbsd ce89dc54e9c4 cc095639 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/06/04 13:19 openbsd e098f50ba37b 197909be .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/06/01 03:32 openbsd ca362689551c cb4e87ff .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/05/23 09:42 openbsd dbd5cf8c5e8a c69befb3 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/05/21 13:06 openbsd 19a7e1efad25 747d777d .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/05/16 10:19 openbsd 25d4b1a85733 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
2026/04/30 00:49 openbsd 167506022718 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-setuid assert "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == NUM" failed in kern_sig.c
* Struck through repros no longer work on HEAD.