KASAN: invalid memory access in setdisklabel

Status: fixed on 2026/08/09 21:54
Reported-by: syzbot+4b34bf468172c62700f3@syzkaller.appspotmail.com
Fix commit: 68da56e7e9ff Fix for KASAN: invalid memory access in setdisklabel
First crash: 12d, last: 10d

Sample crash report:
panic: Caught invalid memory access at ffff800001830494 size 2 op 0
Stopped at      db_enter+0x17:  popq    %rbp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 419776  50791      0           0          0    0  syz-executor
*449262  36027      0           0  0x4000000    1K syz-executor
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff8463bf62) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001830494) at __asan_load2_noabort+0x107
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 dkcksum sys/kern/subr_disk.c:133 [inline]
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 sys/kern/subr_disk.c:885
sdioctl(d01,84946467,ffff800001830000,2,ffff800045ff6d18) at sdioctl+0x9a7 sys/scsi/sd.c:909
VOP_IOCTL(ffff800001d6b0f8,84946467,ffff800001830000,2,ffff800000119820,ffff800045ff6d18) at VOP_IOCTL+0x131 sys/kern/vfs_vops.c:264
vn_ioctl(ffff800001d3a550,84946467,ffff800001830000,ffff800045ff6d18) at vn_ioctl+0x18c sys/kern/vfs_vnops.c:537
sys_ioctl(ffff800045ff6d18,ffff800039b2c0f0,ffff800039b2c060) at sys_ioctl+0x868 sys/kern/sys_generic.c:510
syscall(ffff800039b2c0f0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039b2c0f0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x48970b80cb0, count: 5
https://www.openbsd.org/ddb.html describes the minimum info required in bug
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ddb{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: Caught invalid memory access at ffff800001830494 size 2 op 0
ddb{1}> show kasan
KASAN: invalid read of 2 bytes at 0xffff800001830494 from pc 0xffffffff83a48778
KASAN: first bad byte at 0xffff800001830494 (+0); shadow 0x04: partial granule (out-of-bounds)
KASAN: 0xffff800001830494 is 1172 bytes inside the 2048-byte malloc slot [0xffff800001830000..0xffff800001830800)
KASAN: allocated at:
#0  malloc+0xda0 sys/kern/kern_malloc.c:446
#1  sys_ioctl+0x4e8 sys/kern/sys_generic.c:-1
#2  syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#2  syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#3  Xsyscall+0x128
KASAN: pc: setdisklabel+0x258
KASAN: call trace:
#0  __asan_load2_noabort+0xe6 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
#0  __asan_load2_noabort+0xe6 sys/kern/subr_kasan.c:1097
#1  setdisklabel+0x258 dkcksum sys/kern/subr_disk.c:133 [inline]
#1  setdisklabel+0x258 sys/kern/subr_disk.c:885
#2  sdioctl+0x9a7 sys/scsi/sd.c:909
#3  VOP_IOCTL+0x131 sys/kern/vfs_vops.c:264
#4  vn_ioctl+0x18c sys/kern/vfs_vnops.c:537
#5  sys_ioctl+0x868 sys/kern/sys_generic.c:510
#6  syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6  syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#7  Xsyscall+0x128
KASAN: shadow of 0xffff800001830380..0xffff800001830600 (1 cell = 8 bytes):
 0xffff800001830380: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
 0xffff800001830400: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
>0xffff800001830480: 08 08[04]fb fc fc fc fc fc fc fc fc fc fc fc fc
 0xffff800001830500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 0xffff800001830580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff8463bf62) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001830494) at __asan_load2_noabort+0x107
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 dkcksum sys/kern/subr_disk.c:133 [inline]
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 sys/kern/subr_disk.c:885
sdioctl(d01,84946467,ffff800001830000,2,ffff800045ff6d18) at sdioctl+0x9a7 sys/scsi/sd.c:909
VOP_IOCTL(ffff800001d6b0f8,84946467,ffff800001830000,2,ffff800000119820,ffff800045ff6d18) at VOP_IOCTL+0x131 sys/kern/vfs_vops.c:264
vn_ioctl(ffff800001d3a550,84946467,ffff800001830000,ffff800045ff6d18) at vn_ioctl+0x18c sys/kern/vfs_vnops.c:537
sys_ioctl(ffff800045ff6d18,ffff800039b2c0f0,ffff800039b2c060) at sys_ioctl+0x868 sys/kern/sys_generic.c:510
syscall(ffff800039b2c0f0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039b2c0f0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x48970b80cb0, count: -10
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800039b2b7f0
rbx               0xffff800039b2b860
rdx                                0
rcx               0xffff800028ff3ff0
rax                                0
r8                 0x101010101010101
r9                0x8080808080808080
r10               0xffff800039b2b5d8
r11               0xffffffff837dc8b0    x86_bus_space_io_read_1
r12               0xffffffff8463bf62    switch.table.smu_v14_0_check_fw_version+0x9e0e2
r13               0xffff800028ff4c08
r14               0xffff800028ff4e07
r15                              0x1
rip               0xffffffff82274897    db_enter+0x17
cs                               0x8
rflags                         0x246
rsp               0xffff800039b2b7f0
ss                              0x10
db_enter+0x17:  popq    %rbp
ddb{1}> show proc
PROC (syz-executor) tid=449262 pid=36027 tcnt=3 stat=onproc
    flags process=0 proc=4000000<THREAD>
    runpri=32, usrpri=86, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff800045ff62b8,0xffff800045ff6560
    process=0xffff800045ff0020 user=0xffff800039b21000, vmspace=0xffff800001c91d78
    estcpu=36, cpticks=19, pctcpu=0.0, user=0, sys=19, intr=0
ddb{1}> ps
   PID     TID   PPID   UID  S      PRLAGS     PFLAGS WAIT      COMMAND
 50791  419776  50709     0  7           0          0           syz-executor
  2070  204823  55836     0  2           0          0           syz-executor
  2070  522592  55836     0  3           0  0x4000080 fsleep    syz-executor
 32476  405748  39913     0  2           0          0           syz-executor
 32476    5309  39913     0  3           0  0x4000080 fsleep    syz-executor
 86363  168455  38797     0  2           0          0           syz-executor
 86363   33398  38797     0  3           0  0x4000080 fsleep    syz-executor
 86363  246154  38797     0  3           0  0x4000080 fsleep    syz-executor
  4330  155418  54377     0  2           0          0           syz-executor
  4330   39171  54377     0  3           0  0x4000080 sbwait    syz-executor
  4330  184812  54377     0  3           0  0x4000080 fsleep    syz-executor
  4330  283622  54377     0  2           0  0x4000000           syz-executor
 28843  354219  95114     0  2           0          0           syz-executor
 28843    5325  95114     0  3           0  0x4000080 fsleep    syz-executor
 36027  249701  64535     0  2           0          0           syz-executor
*36027  449262  64535     0  7           0  0x4000000           syz-executor
 36027   30952  64535     0  3           0  0x4000080 fsleep    syz-executor
 60917  511782   5395     0  3         0x2          0 biowait   syz-executor
 55836  463350   5395     0  3         0x2       0x80 nanoslp   syz-executor
 64535  114706   5395     0  3         0x2       0x80 nanoslp   syz-executor
 95114  141611   5395     0  3         0x2       0x80 nanoslp   syz-executor
 50709  426846   5395     0  3         0x2       0x80 nanoslp   syz-executor
 39913  426947   5395     0  3         0x2       0x80 nanoslp   syz-executor
 54377  503407   5395     0  3         0x2       0x80 nanoslp   syz-executor
 38797  151627   5395     0  3         0x2       0x80 nanoslp   syz-executor
  5395   16968  52473     0  3         0x2       0x80 kqread    syz-executor
 52473  514144   3316     0  3    0x100002       0x88 sigsusp   ksh
  3316  441365  25257     0  3        0x10       0x88 kqread    sshd-session
 25257  483554  51150     0  3        0x12       0x80 kqread    sshd-session
 82038  352853      1     0  3    0x100003       0x80 ttyin     getty
 51150    8096      1     0  3           0       0x88 kqread    sshd
 27057     407  68325    74  3   0x1100012       0x80 bpf       pflogd
 68325  102369      1     0  3           0       0x80 sbwait    pflogd
 44235   71277  33958    73  3   0x1100010       0x80 kqread    syslogd
 33958  217098      1     0  3    0x100002       0x80 sbwait    syslogd
 39835  403247      1     0  3    0x100000       0x80 kqread    resolvd
 31697  398893  87882    77  3    0x100012       0x80 kqread    dhcpleased
 99898  444839  87882    77  3    0x100012       0x80 kqread    dhcpleased
 87882   80347      1     0  3           0       0x80 kqread    dhcpleased
 88860  386334      0     0  3     0x14000      0x200 bored     smr
 97113  337462      0     0  2     0x14000      0x200           zerothread
 21192  522338      0     0  3     0x14000      0x200 aiodoned  aiodoned
 74835  296602      0     0  3     0x14000      0x200 syncer    update
 44549  521897      0     0  3     0x14000      0x200 cleaner   cleaner
 83400   59206      0     0  3     0x14000      0x200 reaper    reaper
 58742  485661      0     0  3     0x14000      0x200 pgdaemon  pagedaemon
 22877  172096      0     0  3     0x14000      0x200 bored     viomb
 84474  102159      0     0  3     0x14000 0x40000200 acpi0     acpi0
 54189    9068      0     0  3     0x14000 0x40000200           idle1
 37072  366819      0     0  3     0x14000      0x200 bored     softnet1
 14884  378791      0     0  2     0x14000      0x200           softnet0
 69851  453320      0     0  3     0x14000      0x200 bored     systqmp
 16094   87613      0     0  3     0x14000      0x200 bored     systq
  6181  353665      0     0  3     0x14000      0x200 tmoslp    softclockmp
 87412  205175      0     0  3     0x14000 0x40000200 tmoslp    softclock
 32363  383594      0     0  3     0x14000 0x40000200           idle0
     1  103420      0     0  3         0x2       0x80 wait      init
     0       0     -1     0  3     0x10000      0x200 scheduler swapper
ddb{1}> show all locks
Process 50791 (syz-executor) thread 0xffff800045ff7a10 (419776)
shared rwlock uobjlk r = 0 (0xffff800001afaa48)
#0  witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x632 sys/kern/subr_witness.c:1160
#1  rw_do_enter_read+0x55d sys/kern/kern_rwlock.c:413
#2  uvm_fault_lower_lookup+0xe6 sys/uvm/uvm_fault.c:1204
#3  uvm_fault_lower+0xb6 sys/uvm/uvm_fault.c:1334
#4  uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
#5  upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
#6  usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
#7  recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xffff800001c91c90)
#0  witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x632 sys/kern/subr_witness.c:1160
#1  rw_do_enter_read+0x55d sys/kern/kern_rwlock.c:413
#2  uvmfault_lookup+0x1a2 sys/uvm/uvm_fault.c:-1
#3  uvm_fault_check+0x43 sys/uvm/uvm_fault.c:693
#4  uvm_fault+0x1e7 sys/uvm/uvm_fault.c:627
#5  upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
#6  usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
#7  recall_trap+0x8
Process 36027 (syz-executor) thread 0xffff800045ff6d18 (449262)
exclusive rwlock dklk r = 0 (0xffff8000003d2870)
#0  witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x632 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2  sdioctl+0x577 sys/scsi/sd.c:906
#3  VOP_IOCTL+0x131 sys/kern/vfs_vops.c:264
#4  vn_ioctl+0x18c sys/kern/vfs_vnops.c:537
#5  sys_ioctl+0x868 sys/kern/sys_generic.c:510
#6  syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6  syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#7  Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8543a980)
#0  witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x632 sys/kern/subr_witness.c:1160
#1  vn_ioctl+0x9e sys/kern/vfs_vnops.c:520
#2  sys_ioctl+0x868 sys/kern/sys_generic.c:510
#3  syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3  syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#4  Xsyscall+0x128
Process 60917 (syz-executor) thread 0xffff8000299222a8 (511782)
exclusive rrwlock inode r = 0 (0xffff800001cd2c88)
#0  witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x632 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2  rrw_enter+0xf0 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0x17e sys/kern/vfs_vops.c:527
#4  vn_lock+0xca sys/kern/vfs_vnops.c:576
#5  vget+0x321 sys/kern/vfs_subr.c:699
#6  ufs_ihashget+0x233 sys/ufs/ufs/ufs_ihash.c:98
#7  ffs_vget+0x10b sys/ufs/ffs/ffs_vfsops.c:1203
#8  ufs_lookup+0x1529 sys/ufs/ufs/ufs_lookup.c:478
#9  VOP_LOOKUP+0xda sys/kern/vfs_vops.c:85
#10 vfs_lookup+0xfbd sys/kern/vfs_lookup.c:580
#11 namei+0xe19 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0x102 sys/kern/vfs_syscalls.c:1807
#13 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xffff80000197f8f8)
#0  witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x632 sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2  rrw_enter+0xf0 sys/kern/kern_rwlock.c:621
#3  VOP_LOCK+0x17e sys/kern/vfs_vops.c:527
#4  vn_lock+0xca sys/kern/vfs_vnops.c:576
#5  vget+0x321 sys/kern/vfs_subr.c:699
#6  cache_lookup+0x579 sys/kern/vfs_cache.c:222
#7  ufs_lookup+0x3c0 sys/ufs/ufs/ufs_lookup.c:160
#8  VOP_LOOKUP+0xda sys/kern/vfs_vops.c:85
#9  vfs_lookup+0xfbd sys/kern/vfs_lookup.c:580
#10 namei+0xe19 sys/kern/vfs_lookup.c:250
#11 dounlinkat+0x102 sys/kern/vfs_syscalls.c:1807
#12 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#12 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#13 Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 11052  12236K   12389K 166960K     12260        0
            pcb    17     24K      24K 166960K        31        0
         rtable   215     11K      13K 166960K       381        0
             pf    32     21K      22K 166960K        50        0
         ifaddr    39     11K      12K 166960K        50        0
        ifgroup    51      2K       2K 166960K        61        0
         sysctl     1      1K      13K 166960K         5        0
       counters    68     42K      42K 166960K        74        0
       ioctlops     1      2K       4K 166960K      1558        0
            iov     0      0K      12K 166960K         5        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1297     83K      84K 166960K      1448        0
      UFS quota     1     36K      36K 166960K         1        0
      UFS mount     5     44K      44K 166960K         5        0
            shm     2      2K       6K 166960K         4        0
         VM map     2      1K       1K 166960K         2        0
            sem     5      0K       0K 166960K         5        0
        dirhash    12      2K       2K 166960K        12        0
           ACPI  1734    201K     292K 166960K     11964        0
      file desc    17     61K      93K 166960K       210        0
          sigio     0      0K       0K 166960K         3        0
           proc    70    128K     177K 166960K       581        0
        subproc    72      9K       9K 166960K        81        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     20K      20K 166960K         1        0
    ip_moptions     0      0K       0K 166960K         2        0
       in_multi    88      6K       7K 166960K       111        0
    ether_multi     1      0K       0K 166960K         1        0
            mrt     0      0K       0K 166960K         2        0
    ISOFS mount     1     36K      36K 166960K         1        0
  MSDOSFS mount     1     20K      20K 166960K         1        0
           ttys    37    263K     263K 166960K        37        0
           exec     0      0K       2K 166960K       402        0
   fusefs mount     1     36K      36K 166960K         1        0
            tdb     3      1K       1K 166960K         3        0
        VM swap    14    124K     124K 166960K        15        0
       UVM amap   234    233K     263K 166960K      3681        0
       UVM aobj     5      4K       4K 166960K         5        0
     pinsyscall  1066   1744K    1744K 166960K      1395        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     0      0K       0K 166960K         1        0
            NDP    11      0K       1K 166960K        32        0
           temp    35   9162K    9182K 166960K      5619        0
         kqueue    14     44K      52K 166960K        40        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       28    0        0     1     0     1     1     0     8    0
rtpcb      120       36    0       33     1     0     1     1     0     8    0
rtentry    176      122    0       23     6     0     6     6     0     8    0
unpcb      144      111    0       91     3     0     3     3     0     8    2
syncache   336        4    0        4     2     2     0     1     0     8    0
tcpcb      736       14    0       10     1     0     1     1     0     8    0
arp        136       20    0        4     1     0     1     1     0     8    0
inpcb      328      108    0       99     2     0     2     2     0     8    1
nd6        152       27    0        6     1     0     1     1     0     8    0
kcovpl      48        9    0        1     1     0     1     1     0     8    0
ppxss      1192       1    0        1     1     0     1     1     0     8    1
pffrag     232        2    0        0     1     0     1     1     0   482    0
pffrnode    88        2    0        0     1     0     1     1     0     8    0
pffrent     40        3    0        1     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       23    0        0     1     0     1     1     0     8    0
pfstkey    128       23    0        0     1     0     1     1     0     8    0
pfstate    448       23    0        0     3     0     3     3     0     8    0
pfrule     1360      22    0       17     2     1     1     2     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      497    0       88    29     0    29    29     0     8    2
art_table   40      498    0       88     5     0     5     5     0     8    0
art_node    32      122    0       32     1     0     1     1     0     8    0
sysvmsgpl   40        2    0        0     1     0     1     1     0     8    0
semapl      72        3    0        0     1     0     1     1     0     8    0
shmpl      112        2    0        0     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1706    0      233    93     0    93    93     0     8    0
ffsino     296     1706    0      233   114     0   114   114     0     8    0
nchpl      144     1988    0      280    64     0    64    64     0     8    0
vnodes     216     1826    0        0   102     0   102   102     0     8    0
namei      1024    6283    0     6283     1     0     1     1     0     8    1
percpumem   16       53    0        3     1     0     1     1     0     8    0
kstatmem   264       31    0        6     2     0     2     2     0     8    0
scxspl     216     7170    0     7169     4     3     1     3     1     8    0
plimitpl   152       31    0       14     1     0     1     1     0     8    0
sigapl     424      526    0      479     7     1     6     7     0     8    0
knotepl    120       90    0        0     3     0     3     3     0     8    0
kqueuepl   224       49    0       37     1     0     1     1     0     8    0
pipepl     344      135    0      108     3     0     3     3     0     8    0
fdescpl    528      510    0      479     3     0     3     3     0     8    0
filepl     160     2097    0     1872    12     0    12    12     0     8    1
lockfpl    104       38    0       36     1     0     1     1     0     8    0
lockfspl    48       19    0       17     1     0     1     1     0     8    0
sessionpl  144       27    0       18     1     0     1     1     0     8    0
pgrppl      48       36    0       19     1     0     1     1     0     8    0
ucredpl    104      223    0      209     1     0     1     1     0     8    0
zombiepl   144      479    0      479     1     0     1     1     0     8    1
processpl  1232     526    0      479     5     0     5     5     0     8    0
procpl     664      648    0      591     6     0     6     6     0     8    1
sockpl     752      256    0      224     7     0     7     7     0     8    3
mcl64k     65536      1    0        0     1     0     1     1     0     8    0
mcl8k      8192       2    0        0     1     0     1     1     0     8    0
mcl4k      4096     115    0        0    15     0    15    15     0     8    0
mcl2k2     2112       1    0        0     1     0     1     1     0     8    0
mcl2k      2048      15    0        0     2     0     2     2     0     8    0
mextrefs    64       15    0        0     1     0     1     1     0     8    0
mtagpl      96        3    0        0     1     0     1     1     0     8    0
mbufpl     256      132    0        0     8     0     8     8     0     8    0
bufpl      272     2486    0      109   159     0   159   159     0     8    0
anonpl      32     5584    0        0    46     0    46    46     0   222    0
amapchunkpl 152   10694    0    10200    23     1    22    22     0   158    2
amappl16   200     1965    0     1936     5     3     2     5     0     8    0
amappl15   192        7    0        7     2     2     0     1     0     8    0
amappl14   184      476    0      475     1     0     1     1     0     8    0
amappl13   176      125    0      113     1     0     1     1     0     8    0
amappl12   168      764    0      735     2     0     2     2     0     8    0
amappl11   160        7    0        7     2     1     1     1     0     8    1
amappl10   152       70    0       56     1     0     1     1     0     8    0
amappl9    144      271    0      270     1     0     1     1     0     8    0
amappl8    136      107    0      105     1     0     1     1     0     8    0
amappl7    128      154    0      141     1     0     1     1     0     8    0
amappl6    120      166    0      164     1     0     1     1     0     8    0
amappl5    112      111    0      101     1     0     1     1     0     8    0
amappl4    104      289    0      272     1     0     1     1     0     8    0
amappl3     96     1813    0     1716     3     0     3     3     0     8    0
amappl2     88      626    0      547     2     0     2     2     0     8    0
amappl1     80    10790    0    10189    15     1    14    15     0     8    1
amappl      88     2935    0     2771     4     0     4     4     0    92    0
uvmvnodes   80      100    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       19    0       18     1     0     1     1     0     8    0
aobjpl      72        4    0        0     1     0     1     1     0     8    0
uaddrrnd    24      510    0      479     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      510    0      479     1     0     1     1     0     8    0
vmmpekpl   168     6243    0     6207     3     0     3     3     0     8    0
vmmpepl    168    41912    0    40007    87     0    87    87     0   357    1
vmsppl     488      509    0      479     5     0     5     5     0     8    0
rwobjpl     80    15567    0    14535    24     1    23    24     0     8    0
pdppl      4096    1029    0      958   109    36    73    87     0     8    2
pvpl        32    11186    0        0    91     0    91    91     0   265    0
pmappl     256      509    0      479     3     0     3     3     0     8    0
extentpl    40       47    0       29     1     0     1     1     0     8    0
phpool     120      436    0       41    12     0    12    12     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x19:        leave
x86_ipi_db(ffffffff84ecfff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__asan_load4_noabort(ffffffff8543a180) at __asan_load4_noabort
intr_handler(ffff800034ef00d0,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
__asan_load8_noabort(ffffffff85d60020) at __asan_load8_noabort+0xa kasan_shadow_check sys/kern/subr_kasan.c:1099 [inline]
__asan_load8_noabort(ffffffff85d60020) at __asan_load8_noabort+0xa sys/kern/subr_kasan.c:1099
mtx_enter(ffffffff85445780) at mtx_enter+0x83 sys/kern/kern_lock.c:400
uvm_pageactivate(fffffd800b9f2070) at uvm_pageactivate+0x19e sys/uvm/uvm_page.c:1270
uvm_fault_lower_lookup(ffff800034ef0560,ffff800034ef0508,ffff800034ef0660) at uvm_fault_lower_lookup+0x557 sys/uvm/uvm_fault.c:1248
uvm_fault_lower(ffff800034ef0560,ffff800034ef0508,ffff800034ef0660) at uvm_fault_lower+0xb6 sys/uvm/uvm_fault.c:1334
uvm_fault(ffff800001c91b90,1c58910c000,0,4) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff800034ef0840,1c58910cd10) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff800034ef0840) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
end trace frame: 0xffff800034ef08c0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff84ecfff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__asan_load4_noabort(ffffffff8543a180) at __asan_load4_noabort
intr_handler(ffff800034ef00d0,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
__asan_load8_noabort(ffffffff85d60020) at __asan_load8_noabort+0xa kasan_shadow_check sys/kern/subr_kasan.c:1099 [inline]
__asan_load8_noabort(ffffffff85d60020) at __asan_load8_noabort+0xa sys/kern/subr_kasan.c:1099
mtx_enter(ffffffff85445780) at mtx_enter+0x83 sys/kern/kern_lock.c:400
uvm_pageactivate(fffffd800b9f2070) at uvm_pageactivate+0x19e sys/uvm/uvm_page.c:1270
uvm_fault_lower_lookup(ffff800034ef0560,ffff800034ef0508,ffff800034ef0660) at uvm_fault_lower_lookup+0x557 sys/uvm/uvm_fault.c:1248
uvm_fault_lower(ffff800034ef0560,ffff800034ef0508,ffff800034ef0660) at uvm_fault_lower+0xb6 sys/uvm/uvm_fault.c:1334
uvm_fault(ffff800001c91b90,1c58910c000,0,4) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff800034ef0840,1c58910cd10) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff800034ef0840) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f1e68519450, count: -15
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x17:  popq    %rbp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff8463bf62) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001830494) at __asan_load2_noabort+0x107
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 dkcksum sys/kern/subr_disk.c:133 [inline]
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 sys/kern/subr_disk.c:885
sdioctl(d01,84946467,ffff800001830000,2,ffff800045ff6d18) at sdioctl+0x9a7 sys/scsi/sd.c:909
VOP_IOCTL(ffff800001d6b0f8,84946467,ffff800001830000,2,ffff800000119820,ffff800045ff6d18) at VOP_IOCTL+0x131 sys/kern/vfs_vops.c:264
vn_ioctl(ffff800001d3a550,84946467,ffff800001830000,ffff800045ff6d18) at vn_ioctl+0x18c sys/kern/vfs_vnops.c:537
sys_ioctl(ffff800045ff6d18,ffff800039b2c0f0,ffff800039b2c060) at sys_ioctl+0x868 sys/kern/sys_generic.c:510
syscall(ffff800039b2c0f0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039b2c0f0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x48970b80cb0, count: 5
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff8463bf62) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001830494) at __asan_load2_noabort+0x107
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 dkcksum sys/kern/subr_disk.c:133 [inline]
setdisklabel(ffff800000127800,ffff800001830000,3) at setdisklabel+0x258 sys/kern/subr_disk.c:885
sdioctl(d01,84946467,ffff800001830000,2,ffff800045ff6d18) at sdioctl+0x9a7 sys/scsi/sd.c:909
VOP_IOCTL(ffff800001d6b0f8,84946467,ffff800001830000,2,ffff800000119820,ffff800045ff6d18) at VOP_IOCTL+0x131 sys/kern/vfs_vops.c:264
vn_ioctl(ffff800001d3a550,84946467,ffff800001830000,ffff800045ff6d18) at vn_ioctl+0x18c sys/kern/vfs_vnops.c:537
sys_ioctl(ffff800045ff6d18,ffff800039b2c0f0,ffff800039b2c060) at sys_ioctl+0x868 sys/kern/sys_generic.c:510
syscall(ffff800039b2c0f0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039b2c0f0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x48970b80cb0, count: -10

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/08 23:40 https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan a6045cdb5fce 5d63f80b .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-kasan KASAN: invalid memory access in setdisklabel
2026/08/07 15:24 https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan ce1c3915af75 e4ef95d6 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-kasan KASAN: invalid memory access in setdisklabel
2026/08/06 17:16 https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan 47df478b2278 cc56899a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-kasan KASAN: invalid memory access in setdisklabel
* Struck through repros no longer work on HEAD.