syzbot


panic: thread NUM p_stat is -NUM

Status: upstream: reported on 2026/05/19 08:15
Reported-by: syzbot+36b7634d3820434a47b7@syzkaller.appspotmail.com
First crash: 2d00h, last: 2d00h

Sample crash report:
panic: thread 0 p_stat is -1
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83509fc9) at panic+0x1cf sys/kern/subr_prf.c:198
wakeup_n(fffffd8067dd2388,ffffffff) at wakeup_n+0x3af
sd_buf_done(fffffd8007ff46c0) at sd_buf_done+0x2de sys/scsi/sd.c:770
vioscsi_vq_done(ffff8000000a2618) at vioscsi_vq_done+0xe1 sys/dev/pv/vioscsi.c:-1
intr_handler(ffff80003c9cccf0,ffff80000029af80) at intr_handler+0xcb sys/arch/amd64/amd64/intr.c:-1
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
Xspllower() at Xspllower+0x1d
softintr_dispatch(0) at softintr_dispatch+0xe3 sys/kern/kern_softintr.c:-1
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
buf_get(0,0,ffd000) at buf_get+0x5de sys/kern/vfs_bio.c:1170
geteblk(ffd000) at geteblk+0x3c sys/kern/vfs_bio.c:-1
writedisklabel(d02,ffffffff8277f790,ffff800000039000) at writedisklabel+0x4b sys/arch/amd64/amd64/disksubr.c:133
end trace frame: 0xffff80003c9cd1c0, count: 0
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> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: thread 0 p_stat is -1
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83509fc9) at panic+0x1cf sys/kern/subr_prf.c:198
wakeup_n(fffffd8067dd2388,ffffffff) at wakeup_n+0x3af
sd_buf_done(fffffd8007ff46c0) at sd_buf_done+0x2de sys/scsi/sd.c:770
vioscsi_vq_done(ffff8000000a2618) at vioscsi_vq_done+0xe1 sys/dev/pv/vioscsi.c:-1
intr_handler(ffff80003c9cccf0,ffff80000029af80) at intr_handler+0xcb sys/arch/amd64/amd64/intr.c:-1
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
Xspllower() at Xspllower+0x1d
softintr_dispatch(0) at softintr_dispatch+0xe3 sys/kern/kern_softintr.c:-1
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
buf_get(0,0,ffd000) at buf_get+0x5de sys/kern/vfs_bio.c:1170
geteblk(ffd000) at geteblk+0x3c sys/kern/vfs_bio.c:-1
writedisklabel(d02,ffffffff8277f790,ffff800000039000) at writedisklabel+0x4b sys/arch/amd64/amd64/disksubr.c:133
sdioctl(d01,84946467,ffff80000160c000,3,ffff80002a76b770) at sdioctl+0x959 sys/scsi/sd.c:919
VOP_IOCTL(fffffd8068a25a50,84946467,ffff80000160c000,3,fffffd8007ffd000,ffff80002a76b770) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806caa7448,84946467,ffff80000160c000,ffff80002a76b770) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537
sys_ioctl(ffff80002a76b770,ffff80003c9cd560,ffff80003c9cd4b0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003c9cd560) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c9cd560) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd2e9a287a10, count: -20
ddb> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80003c9ccb00
rbx               0xffff80002a778a70
rdx                                0
rcx                                0
rax               0xffff80002a76b770
r8                 0x101010101010101
r9                0x8080808080808080
r10               0xe9cff523b9a6a236
r11               0x6df36c7d4c86f795
r12                                0
r13                             0xfc
r14                                0
r15                              0x1
rip               0xffffffff81ada545    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80003c9ccaf0
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb> show proc
kernel: page fault trap, code=0
Faulted in DDB; continuing...
ddb> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 86562  340122      0      0  3        0x80  nanoslp       syz-executor
 86562    9292      0      0  3   0x4000080  fsleep        syz-executor
 82209  213496      0      0  3        0x80  nanoslp       syz-executor
 82209  179440      0      0  3   0x4000080  fsleep        syz-executor
 82209  392306      0      0  3   0x4000080  msgwait       syz-executor
 60338  457631      0      0  3     0x14280  nfsidl        nfsio
 48610  158069      0      0  3     0x14280  nfsidl        nfsio
  7260    3047      0      0  3     0x14280  nfsidl        nfsio
 70034    2436      0      0  3     0x14280  nfsidl        nfsio
  6742  281903      0      0  3     0x14280  nfsidl        nfsio
 64590  498377      0      0  3     0x14280  nfsidl        nfsio
ddb> show all locks
No such command
ddb> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11052  12190K   12430K 166960K     12610        0
            pcb    18     14K      15K 166960K       115        0
         rtable   208      6K       9K 166960K       444        0
             pf    31     13K      20K 166960K       359        0
         ifaddr    36      6K       7K 166960K        60        0
        ifgroup    46      2K       2K 166960K        80        0
         sysctl     4      1K       9K 166960K        11        0
       counters    32     17K      18K 166960K        51        0
       ioctlops     1      2K       4K 166960K       339        0
            iov     0      0K       8K 166960K        12        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1390     87K      88K 166960K      1924        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K      13K 166960K        16        0
         VM map     2      1K       1K 166960K         2        0
            sem    12      0K       0K 166960K        84        0
        dirhash    12      2K       2K 166960K        15        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    17     61K      89K 166960K       604        0
          sigio     0      0K       0K 166960K         4        0
           proc    63     67K     108K 166960K       574        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       193        0
       in_multi    83      6K       7K 166960K       116        0
    ether_multi     1      0K       0K 166960K         4        0
            mrt     0      0K       0K 166960K        16        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys   115    519K     519K 166960K       115        0
           exec     0      0K       1K 166960K       486        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   223    142K     161K 166960K      6907        0
       UVM aobj    50      2K       2K 166960K        52        0
     pinsyscall    38     76K      94K 166960K      1685        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     0      0K       0K 166960K        22        0
            NDP    10      0K       2K 166960K        40        0
           temp    53   9110K    9174K 166960K     28378        0
         kqueue    13     20K      28K 166960K       103        0
      SYN cache     2     16K      16K 166960K         2        0
ddb> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb      120       64    0       60     1     0     1     1     0     8    0
rtentry    136      124    0       31     4     0     4     4     0     8    0
unpcb      144      441    0      426     5     1     4     4     0     8    3
syncache   336        3    0        3     1     1     0     1     0     8    0
tcpcb      736      137    0      133     2     1     1     2     0     8    0
arp         96       19    0        5     1     0     1     1     0     8    0
ipq         40        4    0        2     1     0     1     1     0     8    0
ipqe        40        9    0        7     1     0     1     1     0     8    0
inpcb      328      670    0      660    13     6     7     7     0     8    6
ip6q        72        5    0        2     1     0     1     1     0     8    0
ip6af       40       11    0        8     1     0     1     1     0     8    0
nd6        112       28    0        8     1     0     1     1     0     8    0
pkpcb       40        4    0        4     2     1     1     1     0     8    1
kcovpl      48        8    0        0     1     0     1     1     0     8    0
ppxss      1072      16    0       16     2     1     1     1     0     8    1
pppxif     1416       1    0        1     1     1     0     1     0     8    0
pfstscr     40        3    0        2     1     0     1     1     0     8    0
pfrktable  1344      21    0       21     1     1     0     1     0     8    0
pfanchor   1288      12    0       10     2     1     1     1     0     8    0
pfstitem    24        4    0        0     1     0     1     1     0     8    0
pfstkey    128        8    0        4     1     0     1     1     0     8    0
pfstate    384        4    0        2     1     0     1     1     0     8    0
pfrule     1360      87    0       87     2     1     1     1     0     8    1
rttmr      136        2    0        2     1     1     0     1     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      497    0      106    31     1    30    31     0     8    2
art_table   40      498    0      106     5     0     5     5     0     8    0
art_node    32      124    0       39     1     0     1     1     0     8    0
sysvmsgpl   40        7    0        4     1     0     1     1     0     8    0
semapl      64       79    0       69     1     0     1     1     0     8    0
shmpl      112       49    0        2     2     0     2     2     0     8    0
dirhash    1024      19    0        2     3     0     3     3     0     8    0
dirhash: pool(0xffffffff839c6e20:dirhash): free list modified: page 0xffff80002a77a000; item ordinal 0; addr 0xffff80002a77ac00 (p 0xfffffd806e9b4000); offset 0x0=0x0
pool(dirhash): free list modified: page 0xffff80002a77a000; item ordinal 0; addr 0xffff80002a77ac00 (p 0xfffffd806e9b4000); offset 0x0=0x0
dirhash: pool(0xffffffff839c6e20:dirhash): page inconsistency: page 0xffff80002a77a000; item ordinal 1; addr 0x578293f53fa7b614
dino2pl    256     2537    0     1078    92     0    92    92     0     8    0
ffsino     256     2537    0     1078    92     0    92    92     0     8    0
nchpl      144     3391    0     1696    64     0    64    64     0     8    0
rtmask      32        2    0        2     1     1     0     1     0     8    0
vnodes     216     2919    0        0   163     0   163   163     0     8    0
namei      1024   10864    0    10864     3     2     1     2     0     8    1
namei: pool(0xffffffff83999b48:namei): free list modified: page 0xffff80002a748000; item ordinal 0; addr 0xffff80002a748000 (p 0xfffffd806cac0000); offset 0x0=0x0
namei: pool(0xffffffff83999b48:namei): page inconsistency: page 0xffff80002a748000; item ordinal 1; addr 0x43aa8881bc3d11ca
pfiaddrpl  120        7    0        7     1     1     0     1     0     8    0
kstatmem   264       47    0       26     2     0     2     2     0     8    0
scsiplug    72        3    0        3     2     1     1     1     0     8    1
scxspl     216    15210    0    15209     8     7     1     8     1     8    0
plimitpl   152       85    0       67     1     0     1     1     0     8    0
sigapl     424      915    0      852     8     0     8     8     0     8    0
knotepl    120    26495    0    26448    17     8     9    10     0     8    7
kqueuepl   184      168    0      158     1     0     1     1     0     8    0
pipepl     304      246    0      217     6     3     3     6     0     8    0
fdescpl    448      881    0      852     5     1     4     5     0     8    0
filepl     120     5174    0     4955    17     7    10    15     0     8    3
lockfpl    104      217    0      215     1     0     1     1     0     8    0
lockfspl    48       94    0       92     1     0     1     1     0     8    0
sessionpl  144       39    0       31     1     0     1     1     0     8    0
pgrppl      48       51    0       35     1     0     1     1     0     8    0
ucredpl    104     1016    0     1005     1     0     1     1     0     8    0
zombiepl   144      855    0      852     1     0     1     1     0     8    0
processpl  1152     915    0      852     5     0     5     5     0     8    0
processpl: pool(0xffffffff839d5fe8:processpl): page inconsistency: page 0x0; at page head addr 0xffff80002a79ff90 (p 0xffff80002a79c000)
procpl     664     1610    0     1539     7     0     7     7     0     8    0
procpl: pool(0xffffffff839d5e30:procpl): page inconsistency: page 0x0; at page head addr 0xffff80002a6edf90 (p 0xffff80002a6ec000)
procpl: pool(0xffffffff839d5e30:procpl): page inconsistency: page 0xffffffff8246375a; at page head addr 0xffff80002a77df90 (p 0xffff80002a77c000)
sosppl     176        1    0        1     1     0     1     1     0     8    1
sockpl     552     1203    0     1174    12     4     8     8     0     8    5
mcl64k     65536     66    0       66     2     1     1     1     0     8    1
mcl16k     16384      3    0        3     1     1     0     1     0     8    0
mcl12k     12288      2    0        2     1     1     0     1     0     8    0
mcl9k128   9344       1    0        1     1     1     0     1     0     8    0
mcl8k      8192      26    0       26     2     1     1     1     0     8    1
mcl4k      4096    3205    0     3152    15     8     7    15     0     8    0
mcl2k      2048     712    0      710     1     0     1     1     0     8    0
mtagpl      96        6    0        4     1     0     1     1     0     8    0
mbufpl     256     9484    0     9311    15     3    12    15     0     8    0
bufpl      280     6567    0      354   444     0   444   444     0     8    0
anonpl      24   137684    0   134174    68    30    38    68     0   186    4
amapchunkpl 152   23292    0    22810    38    10    28    31     0   158    7
amappl16   200     2515    0     2463    27    21     6    27     0     8    0
amappl15   192        8    0        8     1     1     0     1     0     8    0
amappl14   184      425    0      423     1     0     1     1     0     8    0
amappl13   176      109    0       99     1     0     1     1     0     8    0
amappl12   168     1119    0     1090     2     0     2     2     0     8    0
amappl11   160        4    0        3     1     0     1     1     0     8    0
amappl10   152       57    0       47     1     0     1     1     0     8    0
amappl9    144      271    0      271     1     1     0     1     0     8    0
amappl8    136      122    0      119     1     0     1     1     0     8    0
amappl7    128      167    0      155     1     0     1     1     0     8    0
amappl6    120      147    0      146     1     0     1     1     0     8    0
amappl5    112      160    0      152     1     0     1     1     0     8    0
amappl4    104      258    0      242     1     0     1     1     0     8    0
amappl3     96     4470    0     4358     4     0     4     4     0     8    0
amappl2     88      518    0      464     2     0     2     2     0     8    0
amappl1     80    10935    0    10390    13     1    12    13     0     8    0
amappl      88     6139    0     5978     5     0     5     5     0    92    0
uvmvnodes   80      117    0        0     3     0     3     3     0     8    0
dma4096    4096       1    0        1     1     1     0     1     0     8    0
dma2048    2048       1    0        1     1     0     1     1     0     8    1
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      254    0      254     1     1     0     1     0     8    0
dma64       64        7    0        7     2     1     1     1     0     8    1
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       51    0        2     1     0     1     1     0     8    0
uaddrrnd    24      881    0      852     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      881    0      852     1     0     1     1     0     8    0
vmmpekpl   168     8601    0     8565     2     0     2     2     0     8    0
vmmpepl    168    61362    0    59551   103    19    84   100     0   357    0
vmsppl     368      880    0      852     4     1     3     4     0     8    0
rwobjpl     40    18407    0    17368    15     2    13    15     0     8    0
pdppl      4096    1768    0     1704    94    28    66    78     0     8    2
pvpl        32   380945    0   371893   147    43   104   145     0   265    8
pmappl     216      880    0      852     2     0     2     2     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      370    0       52    10     0    10    10     0     8    0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83509fc9) at panic+0x1cf sys/kern/subr_prf.c:198
wakeup_n(fffffd8067dd2388,ffffffff) at wakeup_n+0x3af
sd_buf_done(fffffd8007ff46c0) at sd_buf_done+0x2de sys/scsi/sd.c:770
vioscsi_vq_done(ffff8000000a2618) at vioscsi_vq_done+0xe1 sys/dev/pv/vioscsi.c:-1
intr_handler(ffff80003c9cccf0,ffff80000029af80) at intr_handler+0xcb sys/arch/amd64/amd64/intr.c:-1
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
Xspllower() at Xspllower+0x1d
softintr_dispatch(0) at softintr_dispatch+0xe3 sys/kern/kern_softintr.c:-1
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
buf_get(0,0,ffd000) at buf_get+0x5de sys/kern/vfs_bio.c:1170
geteblk(ffd000) at geteblk+0x3c sys/kern/vfs_bio.c:-1
writedisklabel(d02,ffffffff8277f790,ffff800000039000) at writedisklabel+0x4b sys/arch/amd64/amd64/disksubr.c:133
sdioctl(d01,84946467,ffff80000160c000,3,ffff80002a76b770) at sdioctl+0x959 sys/scsi/sd.c:919
VOP_IOCTL(fffffd8068a25a50,84946467,ffff80000160c000,3,fffffd8007ffd000,ffff80002a76b770) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806caa7448,84946467,ffff80000160c000,ffff80002a76b770) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537
sys_ioctl(ffff80002a76b770,ffff80003c9cd560,ffff80003c9cd4b0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003c9cd560) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c9cd560) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd2e9a287a10, count: -20
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83509fc9) at panic+0x1cf sys/kern/subr_prf.c:198
wakeup_n(fffffd8067dd2388,ffffffff) at wakeup_n+0x3af
sd_buf_done(fffffd8007ff46c0) at sd_buf_done+0x2de sys/scsi/sd.c:770
vioscsi_vq_done(ffff8000000a2618) at vioscsi_vq_done+0xe1 sys/dev/pv/vioscsi.c:-1
intr_handler(ffff80003c9cccf0,ffff80000029af80) at intr_handler+0xcb sys/arch/amd64/amd64/intr.c:-1
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
Xspllower() at Xspllower+0x1d
softintr_dispatch(0) at softintr_dispatch+0xe3 sys/kern/kern_softintr.c:-1
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
buf_get(0,0,ffd000) at buf_get+0x5de sys/kern/vfs_bio.c:1170
geteblk(ffd000) at geteblk+0x3c sys/kern/vfs_bio.c:-1
writedisklabel(d02,ffffffff8277f790,ffff800000039000) at writedisklabel+0x4b sys/arch/amd64/amd64/disksubr.c:133
sdioctl(d01,84946467,ffff80000160c000,3,ffff80002a76b770) at sdioctl+0x959 sys/scsi/sd.c:919
VOP_IOCTL(fffffd8068a25a50,84946467,ffff80000160c000,3,fffffd8007ffd000,ffff80002a76b770) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806caa7448,84946467,ffff80000160c000,ffff80002a76b770) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537
sys_ioctl(ffff80002a76b770,ffff80003c9cd560,ffff80003c9cd4b0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003c9cd560) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c9cd560) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd2e9a287a10, count: -20

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/19 08:14 openbsd 8a5afb5cdcf9 340bcdf0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main panic: thread NUM p_stat is -NUM
* Struck through repros no longer work on HEAD.