syzbot


panic: Empty stailq ADDR->stqh_last is ADDR, not head's first field address

Status: fixed on 2025/02/21 18:47
Reported-by: syzbot+d67eddd8c4923ee28bb7@syzkaller.appspotmail.com
Fix commit: 36631977d8c9 ktr: Use STAILQ_EMPTY_ATOMIC when checking for records in ktr_drain()
First crash: 32d, last: 32d

Sample crash report:
panic: Empty stailq 0xfffffe0007be3500->stqh_last is 0xfffffe00541ccc58, not head's first field address
cpuid = 0
time = 15
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc6/frame 0xfffffe0056f7e830
kdb_backtrace() at kdb_backtrace+0xd0/frame 0xfffffe0056f7e990
vpanic() at vpanic+0x257/frame 0xfffffe0056f7eb50
panic() at panic+0xb5/frame 0xfffffe0056f7ec10
ktr_drain() at ktr_drain+0x414/frame 0xfffffe0056f7ece0
ktr_submitrequest() at ktr_submitrequest+0x65/frame 0xfffffe0056f7ed10
ia32_syscall() at ia32_syscall+0x993/frame 0xfffffe0056f7ef30
int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0xffffda80
KDB: enter: panic
[ thread pid 4100 tid 100100 ]
Stopped at      kdb_enter+0x6e: movq    $0,0x23e9407(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db> show registers
cs                        0x20
ds                        0x3b
es                        0x3b
fs                        0x13
gs                        0x1b
ss                           0
rax                       0x12
rcx         0xfffffe00033eee30
rdx                          0
rbx         0xffffffff8273cec0  .str.27
rsp         0xfffffe0056f7e970
rbp         0xfffffe0056f7e990
rsi                          0
rdi         0xffffffff815d7629  printf+0x149
r8                           0
r9                  0xffffffff
r10                          0
r11                        0x4
r12         0xfffffe005b4a6740
r13         0xfffffffffffffffe
r14         0xffffffff8273cec0  .str.27
r15                          0
rip         0xffffffff815c0c8e  kdb_enter+0x6e
rflags                    0x46
kdb_enter+0x6e: movq    $0,0x23e9407(%rip)
db> show proc
Process 4100 (syz-executor) at 0xfffffe0007be3020:
 state: NORMAL
 uid: 0  gids: 0, 0, 5
 parent: pid 764 at 0xfffffe005b4a8560
 ABI: FreeBSD ELF32
 flag: 0x10000080  flag2: 0
 arguments: ./syz-executor exec
 reaper: 0xfffffe0007a07040 reapsubtree: 1
 sigparent: 20
 vmspace: 0xfffffe005b56db68
   (map 0xfffffe005b56db68)
   (map.pmap 0xfffffe005b56dc08)
   (pmap 0xfffffe005b56dc78)
 threads: 2
100100                   Run     CPU 0                       syz-executor
103386                   Run     CPU 1                       syz-executor
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
 4100   764   764     0  R       (threaded)                  syz-executor
100100                   Run     CPU 0                       syz-executor
103386                   Run     CPU 1                       syz-executor
 4099  3606  3606     0  R       (threaded)                  syz-executor
103231                   RunQ                                syz-executor
103385                   S       uwait   0xfffffe0077c19700  syz-executor
 4089   765   765     0  S       (threaded)                  syz-executor
100098                   S       nanslp  0xffffffff8398b441  syz-executor
103372                   S       fifoor  0xfffffe0007849ec8  syz-executor
103376                   S       uwait   0xfffffe0077c19600  syz-executor
 4083   767   767     0  S       (threaded)                  syz-executor
102878                   S       nanslp  0xffffffff8398b441  syz-executor
103367                   S       connec  0xfffffe006b6b98da  syz-executor
103373                   S       uwait   0xfffffe0077a5c680  syz-executor
 4061     1   764     0  S       uwait   0xfffffe00586f8f00  syz-executor
 4046     1   767     0  S       uwait   0xfffffe0077a5c480  syz-executor
 4045     1   764     0  S       uwait   0xfffffe0077c19100  syz-executor
 4040     1   767     0  S       uwait   0xfffffe0077a5c280  syz-executor
 4026     1   764     0  S       uwait   0xfffffe0077a5d500  syz-executor
 4015     1   765     0  S       uwait   0xfffffe0077c19400  syz-executor
 4010     1   764     0  S       uwait   0xfffffe0077a5ca80  syz-executor
 3996     1   764 60929  S       uwait   0xfffffe0058460380  syz-executor
 3992     1   767     0  S       uwait   0xfffffe0077c19300  syz-executor
 3979     1   765 60929  S       uwait   0xfffffe0058463200  syz-executor
 3966     1   764     0  S       uwait   0xfffffe0058463600  syz-executor
 3941     1   765     0  S       uwait   0xfffffe0054200180  syz-executor
 3932     1   765     0  S       uwait   0xfffffe0054200280  syz-executor
 3900     1   767     0  T                                   syz-executor
 3893     1   765     0  S       uwait   0xfffffe0077c19b00  syz-executor
 3892     1   767 60929  S       uwait   0xfffffe0058461a00  syz-executor
 3819     1  3606     0  S       uwait   0xfffffe0077a5e380  syz-executor
 3808     1  3606     0  S       uwait   0xfffffe0077a5d000  syz-executor
 3797     1   767     0  S       uwait   0xfffffe0077a5cc80  syz-executor
 3766     1   764     0  SV      uwait   0xfffffe0077c19000  syz-executor
 3717     1  3606     0  S       uwait   0xfffffe0077a5d400  syz-executor
 3706     1   765     0  S       uwait   0xfffffe0077a5df00  syz-executor
 3685     1   765     0  S       uwait   0xfffffe0077c19e00  syz-executor
 3684     1   767     0  SV      uwait   0xfffffe0077a5dd00  syz-executor
 3664     1   764     0  S       uwait   0xfffffe0077c19a00  syz-executor
 3655     0     0     0  DL      mdwait  0xfffffe007c9a6000  [md20]
 3650     1  3606     0  S       uwait   0xfffffe00586f8300  syz-executor
 3649     1   765     0  S       uwait   0xfffffe0077a5db00  syz-executor
 3632     0     0     0  DL      mdwait  0xfffffe007c9ca000  [md19]
 3606   763  3606     0  S       nanslp  0xffffffff8398b440  syz-executor
 3593     1   767     0  S       uwait   0xfffffe0077a5d700  syz-executor
 3522     0     0     0  DL      mdwait  0xfffffe007c97b000  [md18]
 3491     1   767     0  S       uwait   0xfffffe0077c19c00  syz-executor
 3477     1   767     0  S       uwait   0xfffffe0077a5ce80  syz-executor
 3447     1   765     0  S       uwait   0xfffffe0077a5da00  syz-executor
 3435     1   767     0  S       uwait   0xfffffe0077a5de00  syz-executor
 3416     0     0     0  DL      mdwait  0xfffffe006df9c000  [md17]
 3385     0     0     0  DL      -       0xffffffff83935c60  [accounting]
 3376     1   765     0  S       uwait   0xfffffe0077a5d900  syz-executor
 3361     1   766     0  S       uwait   0xfffffe00586f8100  syz-executor
 3359     0     0     0  DL      mdwait  0xfffffe0079073000  [md16]
 3335     0     0     0  DL      mdwait  0xfffffe0077bea000  [md15]
 3333     1   765     0  S       uwait   0xfffffe0077a5e280  syz-executor
 3286     0     0     0  DL      mdwait  0xfffffe0077b8a000  [md14]
 3271     1   766     0  S       uwait   0xfffffe0058461d00  syz-executor
 3165     1   766     0  S       uwait   0xfffffe0058463400  syz-executor
 3104     1   765     0  S       uwait   0xfffffe0058463800  syz-executor
 3072     1   764     0  S       uwait   0xfffffe00586f9080  syz-executor
 2997     1   767     0  S       uwait   0xfffffe00586f8000  syz-executor
 2981     1   767     0  S       uwait   0xfffffe0054200600  syz-executor
 2964     1   767     0  S       uwait   0xfffffe0058460480  syz-executor
 2923     1   766     0  S       uwait   0xfffffe0054200800  syz-executor
 2872     1   767     0  S       uwait   0xfffffe0058463500  syz-executor
 2822     1   765     0  S       uwait   0xfffffe0077a5e180  syz-executor
 2792     1   764     0  S       uwait   0xfffffe0058460580  syz-executor
 2727     0     0     0  DL      mdwait  0xfffffe006e55f000  [md13]
 2667     1   767     0  S       uwait   0xfffffe00586f8200  syz-executor
 2656     1   767     0  S       uwait   0xfffffe00586f9380  syz-executor
 2638     1   764     0  S       uwait   0xfffffe00586f8b00  syz-executor
 2600     0     0     0  DL      mdwait  0xfffffe00779a4000  [md0]
 2491     1   766     0  S       uwait   0xfffffe00586f8a00  syz-executor
 2425     1   764     0  S       uwait   0xfffffe00586f8600  syz-executor
 2408     1  2408     0  S       uwait   0xfffffe0054200e00  syz-executor
 2402     0     0     0  DL      mdwait  0xfffffe0077a4f000  [md12]
 2338     1   767     0  S       uwait   0xfffffe0054200900  syz-executor
 2315     0     0     0  DL      mdwait  0xfffffe0077900000  [md11]
 2306     0     0     0  DL      mdwait  0xfffffe0077956000  [md10]
 2291     0     0     0  DL      mdwait  0xfffffe00778f9000  [md9]
 2285     0     0     0  DL      mdwait  0xfffffe007787b000  [md8]
 2283     1   767     0  S       uwait   0xfffffe00586f9980  syz-executor
 2267     0     0     0  DL      mdwait  0xfffffe00778d7000  [md7]
 2260     0     0     0  DL      mdwait  0xfffffe007785e000  [md6]
 2249     1   765     0  S       uwait   0xfffffe0054200700  syz-executor
 2220     0     0     0  DL      mdwait  0xfffffe007786f000  [md5]
 2203     0     0     0  DL      mdwait  0xfffffe007786b000  [md4]
 2188     0     0     0  DL      mdwait  0xfffffe0059830000  [md3]
 2133     0     0     0  DL      mdwait  0xfffffe0077816000  [md2]
 2117     0     0     0  DL      (threaded)                  [so_splice]
100108                   D       -       0xfffffe0058463980  [thr_0]
101361                   D       -       0xfffffe00584639c0  [thr_1]
 2096  2083  2096     0  Ss      select  0xfffffe00597ba440  dhclient
 2088     1  2088     0  Ss      select  0xfffffe00597b8f40  dhclient
 2083  2063   424    65  S       select  0xfffffe006e5eef40  dhclient
 2063   424   424     0  S       wait    0xfffffe0007a07b00  sh
 2009     0     0     0  DL      mdwait  0xfffffe00597de000  [md1]
 1955     0     0     0  DL      mdwait  0xfffffe006b61f000  [md33554944]
 1902     0     0     0  DL      -       0xffffffff83a9b300  [soaiod4]
 1901     0     0     0  DL      -       0xffffffff83a9b300  [soaiod3]
 1900     0     0     0  DL      -       0xffffffff83a9b300  [soaiod2]
 1899     0     0     0  DL      -       0xffffffff83a9b300  [soaiod1]
 1759     1   764     0  S       uwait   0xfffffe00586f8400  syz-executor
 1742     1   767     0  S       umtxn   0xfffffe00586f9880  syz-executor
 1388     1   766     0  SV      uwait   0xfffffe0058460180  syz-executor
  985     1   766     0  S       uwait   0xfffffe0058462c80  syz-executor
  886     1   765     0  S       uwait   0xfffffe00586f9a80  syz-executor
  818     0     0     0  DL      aiordy  0xfffffe0007a24560  [aiod4]
  816     0     0     0  DL      aiordy  0xfffffe0007a085c0  [aiod3]
  814     0     0     0  DL      aiordy  0xfffffe0007be5060  [aiod2]
  813     0     0     0  DL      aiordy  0xfffffe005b4c3ae0  [aiod1]
  767   763   767     0  S       nanslp  0xffffffff8398b441  syz-executor
  765   763   765     0  S       nanslp  0xffffffff8398b441  syz-executor
  764   763   764     0  S       nanslp  0xffffffff8398b440  syz-executor
  763     1   761     0  S       select  0xfffffe0057ec1d40  syz-executor
  759   682   759     0  Ss      select  0xfffffe0057f8a7c0  sshd
  748     1   748     0  Ss+     ttyin   0xfffffe00584954b0  getty
  747     1   747     0  Ss+     ttyin   0xfffffe00588458b0  getty
  746     1   746     0  Ss+     ttyin   0xfffffe0058845cb0  getty
  745     1   745     0  Ss+     ttyin   0xfffffe00588460b0  getty
  744     1   744     0  Ss+     ttyin   0xfffffe00588464b0  getty
  743     1   743     0  Ss+     ttyin   0xfffffe00588468b0  getty
  742     1   742     0  Ss+     ttyin   0xfffffe0058846cb0  getty
  741     1   741     0  Ss+     ttyin   0xfffffe00588470b0  getty
  740     1   740     0  Ss+     ttyin   0xfffffe00588474b0  getty
  686     1   686     0  Ss      nanslp  0xffffffff8398b440  cron
  682     1   682     0  Ss      select  0xfffffe0057f8ad40  sshd
  495     1   495     0  Ss      select  0xfffffe0057f8a640  syslogd
  424     1   424     0  Ss      wait    0xfffffe005b4a9ae0  devd
   17     0     0     0  DL      syncer  0xffffffff83aa8ca0  [syncer]
   16     0     0     0  DL      vlruwt  0xfffffe0007a26040  [vnlru]
   15     0     0     0  DL      (threaded)                  [bufdaemon]
100080                   D       psleep  0xffffffff83aa7260  [bufdaemon]
100083                   D       -       0xffffffff82e02140  [bufspacedaemon-0]
100096                   D       sdflush 0xfffffe00598f7ce8  [/ worker]
    9     0     0     0  DL      psleep  0xffffffff83af2120  [vmdaemon]
    8     0     0     0  DL      (threaded)                  [pagedaemon]
100078                   D       psleep  0xffffffff83ad80b8  [dom0]
100081                   D       launds  0xffffffff83ad80c4  [laundry: dom0]
100082                   D       umarcl  0xffffffff81d79430  [uma]
    7     0     0     0  DL      -       0xffffffff83708c10  [rand_harvestq]
    6     0     0     0  TL      pftm    0xffffffff842b5480  [pf purge]
    5     0     0     0  DL      waiting 0xffffffff846d5580  [sctp_iterator]
    4     0     0     0  DL      (threaded)                  [cam]
100046                   D       -       0xffffffff836d3340  [doneq0]
100047                   D       -       0xffffffff836d32c0  [async]
100076                   D       -       0xffffffff836d3140  [scanner]
    3     0     0     0  DL      (threaded)                  [crypto]
100043                   D       crypto_ 0xffffffff83ad38e0  [crypto]
100044                   D       crypto_ 0xfffffe0057f63030  [crypto returns 0]
100045                   D       crypto_ 0xfffffe0057f63080  [crypto returns 1]
   14     0     0     0  DL      seqstat 0xfffffe0057ecc488  [sequencer 00]
   13     0     0     0  DL      (threaded)                  [geom]
100037                   D       -       0xffffffff83933e20  [g_event]
100038                   D       -       0xffffffff83933e40  [g_up]
100039                   D       -       0xffffffff83933e60  [g_down]
    2     0     0     0  WL      (threaded)                  [clock]
100031                   I                                   [clock (0)]
100032                   I                                   [clock (1)]
   12     0     0     0  WL      (threaded)                  [intr]
100013                   I                                   [swi6: task queue]
100014                   I                                   [swi6: Giant taskq]
100016                   I                                   [swi5: fast taskq]
100033                   I                                   [swi1: netisr 0]
100034                   I                                   [swi1: hpts]
100035                   I                                   [swi1: hpts]
100048                   I                                   [irq24: virtio_pci0]
100049                   I                                   [irq25: virtio_pci0]
100050                   I                                   [irq26: virtio_pci0]
100051                   I                                   [irq27: virtio_pci0]
100052                   I                                   [irq28: virtio_pci1]
100053                   I                                   [irq29: virtio_pci1]
100054                   I                                   [irq30: virtio_pci1]
100055                   I                                   [irq31: virtio_pci1]
100056                   I                                   [irq32: virtio_pci1]
100061                   I                                   [irq10: virtio_pci2]
100063                   I                                   [irq1: atkbd0]
100064                   I                                   [irq12: psm0]
100065                   I                                   [swi0: uart uart++]
100069                   I                                   [swi1: pf send]
   11     0     0     0  RL      (threaded)                  [idle]
100003                   CanRun                              [idle: cpu0]
100004                   CanRun                              [idle: cpu1]
    1     0     1     0  SLs     wait    0xfffffe0007a07040  [init]
   10     0     0     0  DL      audit_w 0xffffffff83ad4380  [audit]
    0     0     0     0  DLs     (threaded)                  [kernel]
100000                   D       parked  0xffffffff84a11ff0  [swapper]
100005                   D       -       0xfffffe0054070100  [softirq_0]
100006                   D       -       0xfffffe005406fe00  [softirq_1]
100007                   D       -       0xfffffe005406fc00  [if_io_tqg_0]
100008                   D       -       0xfffffe005406fa00  [if_io_tqg_1]
100009                   D       -       0xfffffe005406f800  [if_config_tqg_0]
100010                   D       -       0xfffffe0007963200  [pci_hp taskq]
100011                   D       -       0xfffffe0007963100  [kqueue_ctx taskq]
100012                   D       -       0xfffffe0007963000  [jail_remove taskq]
100015                   D       -       0xfffffe0007962c00  [thread taskq]
100017                   D       -       0xfffffe0007962a00  [aiod_kick taskq]
100018                   D       -       0xfffffe0007962900  [deferred_unmount ta]
100019                   D       -       0xfffffe0007962800  [inm_free taskq]
100020                   D       -       0xfffffe0007962700  [in6m_free taskq]
100021                   D       -       0xfffffe0007962600  [linuxkpi_irq_wq]
100022                   D       -       0xfffffe0007962500  [linuxkpi_short_wq_0]
100023                   D       -       0xfffffe0007962500  [linuxkpi_short_wq_1]
100024                   D       -       0xfffffe0007962500  [linuxkpi_short_wq_2]
100025                   D       -       0xfffffe0007962500  [linuxkpi_short_wq_3]
100026                   D       -       0xfffffe0007962400  [linuxkpi_long_wq_0]
100027                   D       -       0xfffffe0007962400  [linuxkpi_long_wq_1]
100028                   D       -       0xfffffe0007962400  [linuxkpi_long_wq_2]
100029                   D       -       0xfffffe0007962400  [linuxkpi_long_wq_3]
100036                   D       -       0xfffffe0007962300  [firmware taskq]
100041                   D       -       0xfffffe0007962200  [crypto_0]
100042                   D       -       0xfffffe0007962200  [crypto_1]
100057                   D       -       0xfffffe0007961e00  [vtnet0 rxq 0]
100058                   D       -       0xfffffe0007961d00  [vtnet0 txq 0]
100059                   D       -       0xfffffe0007961c00  [vtnet0 rxq 1]
100060                   D       -       0xfffffe0007961b00  [vtnet0 txq 1]
100062                   D       vtbslp  0xfffffe0057f8bd80  [virtio_balloon]
100066                   D       -       0xffffffff82742161  [deadlkres]
100070                   D       -       0xfffffe0059600300  [acpi_task_0]
100071                   D       -       0xfffffe0059600300  [acpi_task_1]
100072                   D       -       0xfffffe0059600300  [acpi_task_2]
100074                   D       -       0xfffffe0007963900  [mca taskq]
100075                   D       -       0xfffffe0007962100  [CAM taskq]
100077                   D       -       0xfffffe0007961600  [ipsec_offload]
db> show all locks
Process 4100 (syz-executor) thread 0xfffffe005b4a6740 (100100)
exclusive sx ktrace_sx (ktrace_sx) r = 0 (0xffffffff83937de0) locked @ /syzkaller/managers/i386/kernel/sys/kern/kern_ktrace.c:423
db> show malloc
              Type        InUse        MemUse     Requests
           pf_hash            6        12804K            6
            linker          375         5015K          579
          tcp_hpts            7         4801K            7
            devbuf         4188         4324K         4239
         sysctloid        37678         2221K        37753
             vtbuf           24         1968K           46
        md_sectors          466         1864K          466
              kobj          330         1320K          701
          filedesc          134         1067K         6264
            newblk           99         1049K         4797
          vfscache            3         1025K            3
               pcb           26          671K          464
           subproc          294          607K         4290
          inodedep           94          547K         3575
              vmem            5          528K            8
         ufs_quota            1          512K            1
          vfs_hash            1          512K            1
           callout            2          512K            2
              intr            4          472K            4
         vnet_data            2          224K            2
          acpitask            1          224K            1
            KTRACE          104          201K        86532
            acpica         1674          184K        54408
           pagedep           68          145K         3153
           tidhash            3          141K            3
            DEVFS1          132          132K          152
        tfo_ccache            1          128K            1
          IP reass            1          128K            1
               sem            4          106K            4
           md_disk          488          103K          499
        gtaskqueue           18           98K           18
               bus          994           81K         5040
          mtx_pool            3           74K            3
          syncache            1           68K            1
     NFSD srvcache            3           68K            3
            module          519           65K          521
       ddb_capture            1           64K            1
           kdtrace          356           64K         7490
              umtx          464           58K          464
            DEVFS3          151           38K          162
              temp           40           38K         2489
               shm            3           36K           13
              GEOM          215           34K         1370
         hostcache            1           32K            1
               msg            4           30K            4
            kbdmux            6           28K            6
               LRO           22           23K           22
            ifaddr           75           21K           78
           devstat           10           21K           10
        DEVFS_RULE           56           20K           56
          routetbl          160           19K          484
               BPF           15           19K          138
           lltable           57           18K           68
         ufs_mount            4           17K            5
              proc            3           17K            3
               tty           16           16K           16
           ithread           90           15K           90
       ether_multi          180           15K          273
            bus-sc           34           15K         1637
             ifnet            8           15K            8
      eventhandler          163           14K          163
              kenv           95           12K           95
              ksem            7           11K           20
         CAM queue            5           11K         1528
         in6_multi           75           10K           80
              rman           82           10K          437
             shmfd            4           10K            9
               rpc            8            9K            8
            kqueue          139            9K         4279
           pwddesc          137            9K         4136
         bmsafemap            3            9K         3530
            plimit           22            9K          370
              UART           12            9K           12
       pfs_vncache            1            8K            1
         newdirblk           60            8K         3113
     audit_evclass          239            8K          301
         taskqueue           69            8K          159
            dirrem           27            7K         3428
              cred           26            7K          351
            sglist            6            7K            6
           CAM DEV            3            6K          510
         pfs_nodes           22            6K           22
          pf_ifnet           12            5K           23
               UMA          290            5K          290
       ufs_dirhash           24            5K           24
                vt           11            5K           11
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            nvlist            0            0K          180
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db> show uma
              Zone   Size    Used    Free    Requests  Sleeps  Bucket  Total Mem    XFree
   mbuf_jumbo_page   4096    8341    1057       25958       0     254   38494208        0
         vmem btag     56   46843     140       46843       0     254    2631048        0
      mbuf_cluster   2048     762     508         827       0     254    2600960        0
              mbuf    256    8752     911       54088       0     254    2473728        0
       malloc-4096   4096     502       4        1546       0       2    2072576        0
          BUF TRIE    144     217   11599        1456       0      62    1701504        0
        malloc-384    384    4329      21        4672       0      30    1670400        0
        RADIX NODE    144   11071     488       90257       0      63    1664496        0
        malloc-128    128   12393     224       16238       0     126    1614976        0
       UMA Slabs 0    112   12335       7       12335       0     126    1382304        0
       malloc-4096   4096     330       6         703       0       2    1376256        0
      malloc-16384  16384      67       4        3130       0       1    1163264        0
         sctp_asoc   2256       1     509          14       0     254    1150560        0
      malloc-65536  65536      10       2          23       0       1     786432        0
         FFS inode   1168     591      25        3963       0       8     719488        0
       malloc-4096   4096     147       7        4768       0       2     630784        0
           sctp_ep   1152       1     510         122       0     254     588672        0
            socket   1024      22     486        2495       0     254     520192        0
          lkpicurr    168       2    3094           2       0      62     520128        0
              pbuf   2624       0     198           0       0       2     519552        0
         VM OBJECT    264    1803      87       52334       0      30     498960        0
            THREAD   1824     218      14        3386       0       8     423168        0
        256 Bucket   2048     179      15        3233       0       8     397312        0
        sctp_raddr    736       1     516          19       0     254     380512        0
      malloc-65536  65536       4       1         114       0       1     327680        0
             VNODE    440     632      88        4006       0      30     316800        0
         MAP ENTRY     96    2902     374      153211       0     126     314496        0
         malloc-64     64    4499     352        9039       0     254     310464        0
              md13    512     585      15         585       0      30     307200        0
              md10   4096      73       1          73       0       2     303104        0
               md9   4096      73       1          73       0       2     303104        0
               md6   4096      73       1          73       0       2     303104        0
              md20      8   37462     130       37462       0     254     300736        0
              md19      8   37462     130       37462       0     254     300736        0
              md17      8   37462     130       37462       0     254     300736        0
              md16      8   37462     130       37462       0     254     300736        0
              md15      8   37462     130       37462       0     254     300736        0
              md14      8   37462     130       37462       0     254     300736        0
      malloc-65536  65536       2       2           6       0       1     262144        0
         malloc-16     16   15607     643       15783       0     254     260000        0
       malloc-2048   2048     102      10         144       0       8     229376        0
            DEVCTL   1024      75     145         202       0       0     225280        0
     FPU_save_area    832     220      41        6432       0      16     217152        0
           tcp_log    416       7     506          41       0     254     213408        0
              PROC   1376     136      18        4102       0       8     211904        0
         malloc-32     32    5973     453        6667       0     254     205632        0
         UMA Zones    768     262       2         262       0      16     202752        0
      malloc-65536  65536       0       3         101       0       1     196608        0
      malloc-32768  32768       1       5         335       0       1     196608        0
        malloc-384    384     101     409        3594       0      30     195840        0
       mbuf_packet    256      12     750        1924       0     254     195072        0
        malloc-128    128    1235     284       31582       0     126     194432        0
       malloc-1024   1024     148      28         462       0      16     180224        0
            lkpimm     56       1    3095           1       0     254     173376        0
             unpcb    320       9     507        1409       0     254     165120        0
         filedesc0   1072     137      17        4136       0       8     165088        0
       FFS2 dinode    256     591      39        3963       0      62     161280        0
         malloc-64     64     566    1765      117147       0     254     149184        0
       S VFS Cache    104    1016     388        4457       0     126     146016        0
        malloc-256    256     405     165        9029       0      62     145920        0
        malloc-256    256     148     422        8053       0      62     145920        0
       malloc-2048   2048       8      56        1084       0       8     131072        0
          ksiginfo    112     140     904         252       0     126     116928        0
        malloc-128    128     468     431        7161       0     126     115072        0
        malloc-256    256     356      79        4783       0      62     111360        0
        128 Bucket   1024      63      36         386       0      16     101376        0
        malloc-128    128     607     168        4237       0     126      99200        0
      malloc-32768  32768       3       0           3       0       1      98304        0
          UMA Kegs    384     248       5         248       0      30      97152        0
         64 Bucket    512      87      81        3825       0      30      86016        0
        malloc-128    128     486     165        1153       0     126      83328        0
      malloc-16384  16384       3       2         186       0       1      81920        0
        sctp_chunk    152       1     519           5       0     254      79040        0
       malloc-8192   8192       6       3          19       0       1      73728        0
             g_bio    408       0     180       12866       0      30      73440        0
         malloc-64     64     527     544        1607       0     254      68544        0
      malloc-65536  65536       1       0           1       0       1      65536        0
      malloc-32768  32768       2       0           2       0       1      65536        0
      malloc-32768  32768       0       2         120       0       1      65536        0
      malloc-32768  32768       0       2           2       0       1      65536        0
      malloc-32768  32768       0       2          13       0       1      65536        0
       malloc-8192   8192       4       4         281       0       1      65536        0
       malloc-4096   4096       8       8          21       0       2      65536        0
       malloc-4096   4096       7       9          31       0       2      65536        0
           VMSPACE    584      88      24        4038       0      16      65408        0
        malloc-256    256       7     248        1644       0      62      65280        0
         32 Bucket    256     109     146        2037       0      62      65280        0
sctp_stream_msg_out    112       0     540           4       0     254      60480        0
         udp_inpcb    416       6     120         296       0      30      52416        0
         malloc-64     64     262     557       25630       0     254      52416        0
        malloc-128    128     147     256         959       0     126      51584        0
        malloc-256    256      75     120          83       0      62      49920        0
        malloc-256    256      30     165        7223       0      62      49920        0
           DIRHASH   1024      35      13          35       0      16      49152        0
             NAMEI   1024       2      46       28189       0      16      49152        0
       malloc-8192   8192       6       0           6       0       1      49152        0
       malloc-2048   2048       5      19         320       0       8      49152        0
       malloc-1024   1024       7      41         536       0      16      49152        0
          syncache    168       0     264           3       0     254      44352        0
         tcp_inpcb   1320       7      26         285       0       8      43560        0
         TURNSTILE    136     233      82         233       0      62      42840        0
       malloc-8192   8192       4       1           6       0       1      40960        0
       malloc-8192   8192       3       2           5       0       1      40960        0
            pcpu-8      8    4968     152        5785       0     254      40960        0
              pipe    736      22      33         437       0      16      40480        0
     udplite_inpcb    416       0      90          65       0      30      37440        0
         hostcache     64       2     565           2       0     254      36288        0
         malloc-64     64     162     405         248       0     254      36288        0
         malloc-64     64     150     417       46219       0     254      36288        0
         malloc-64     64      19     548         496       0     254      36288        0
         malloc-64     64      18     549         101       0     254      36288        0
         malloc-32     32     619     515       21184       0     254      36288        0
        malloc-128    128      60     219         267       0     126      35712        0
        malloc-128    128       0     279         192       0     126      35712        0
     routing nhops    256      31     104          41       0      62      34560        0
             ripcb    384       1      89         207       0      30      34560        0
           ttyoutq    256      72      63         160       0      62      34560        0
        malloc-384    384      63      27         712       0      30      34560        0
        malloc-256    256       2     133          91       0      62      34560        0
        malloc-256    256      19     116         187       0      62      34560        0
        SLEEPQUEUE     88     233     151         233       0     126      33792        0
      malloc-32768  32768       1       0           1       0       1      32768        0
      malloc-32768  32768       0       1           1       0       1      32768        0
      malloc-16384  16384       0       2           3       0       1      32768        0
      malloc-16384  16384       2       0           3       0       1      32768        0
      malloc-16384  16384       1       1           2       0       1      32768        0
       malloc-4096   4096       3       5          13       0       2      32768        0
       malloc-2048   2048       6      10          46       0       8      32768        0
       malloc-2048   2048      10       6          14       0       8      32768        0
       malloc-2048   2048       5      11          97       0       8      32768        0
       malloc-2048   2048      12       4          24       0       8      32768        0
       malloc-2048   2048       2      14         109       0       8      32768        0
       malloc-1024   1024       1      31           9       0      16      32768        0
       malloc-1024   1024      26       6          76       0      16      32768        0
       malloc-1024   1024      10      22          29       0      16      32768        0
       malloc-1024   1024       2      30          34       0      16      32768        0
       malloc-1024   1024       4      28        1166       0      16      32768        0
        malloc-512    512       0      64          23       0      30      32768        0
        malloc-512    512       6      58         309       0      30      32768        0
        malloc-512    512       2      62          86       0      30      32768        0
        malloc-512    512       1      63          49       0      30      32768        0
        malloc-512    512       0      64           4       0      30      32768        0
        malloc-512    512      10      54          55       0      30      32768        0
        malloc-512    512       2      62         112       0      30      32768        0
           pcpu-64     64     495      17         495       0     254      32768        0
    ertt_txseginfo     40       0     808        7896       0     254      32320        0
               PWD     40      77     731        3147       0     254      32320        0
       tcp_bbr_pcb    896       0      36           3       0      16      32256        0
               ipq     56       0     576           3       0     254      32256        0
            ttyinq    160     135      65         300       0      62      32000        0
             Files     80     164     236       12711       0     126      32000        0
   tcp_log_id_node    120       2     262          10       0     126      31680        0
              PGRP    120      24     240          56       0     126      31680        0
            clpbuf   2624       0      12          28       0       4      31488        0
        sctp_laddr     48       5     583          26       0     254      28224        0
          rl_entry     48       7     581          11       0     254      28224        0
         16 Bucket    144      64     132         387       0      62      28224        0
          4 Bucket     48       7     581           9       0     254      28224        0
               AIO    208       0     133          83       0      62      27664        0
            da_ccb    544       0      49        3157       0      16      26656        0
            mqnode    416       4      59           4       0      30      26208        0
            cpuset    200       7     121          26       0      62      25600        0
       malloc-8192   8192       1       2          22       0       1      24576        0
 tcp_log_id_bucket    176       2     136           9       0      62      24288        0
      tcp_rack_pcb   1152       0      21           6       0       8      24192        0
           rtentry    168      34     110          41       0      62      24192        0
          8 Bucket     80      56     244         982       0     126      24000        0
            itimer    352       0      66          24       0      30      23232        0
        malloc-384    384       0      60          33       0      30      23040        0
        malloc-384    384      23      37          60       0      30      23040        0
        malloc-384    384       3      57         167       0      30      23040        0
        malloc-384    384       1      59          23       0      30      23040        0
        malloc-384    384      26      34          43       0      30      23040        0
         domainset     40       0     567          15       0     254      22680        0
       Mountpoints   2816       2       6          20       0       4      22528        0
udplite_inpcb ports     32       0     630          10       0     254      20160        0
   udp_inpcb ports     32       3     627          51       0     254      20160        0
   tcp_inpcb ports     32       3     627          58       0     254      20160        0
              ertt     72       5     275         285       0     126      20160        0
         malloc-32     32      46     584         321       0     254      20160        0
         malloc-32     32     136     494         315       0     254      20160        0
         malloc-32     32      95     535        6173       0     254      20160        0
         malloc-32     32      33     597         238       0     254      20160        0
         malloc-32     32      19     611        1956       0     254      20160        0
          2 Bucket     32      86     544        1107       0     254      20160        0
       tcp_bbr_map    128       0     155           3       0     126      19840        0
      tcp_rack_map    128       0     155           6       0     126      19840        0
           cryptop    280       0      70          37       0      30      19600        0
             AIOCB    552       0      35          83       0      16      19320        0
       L VFS Cache    320       0      60          31       0      30      19200        0
            AIOLIO    272       0      70          26       0      30      19040        0
              vmem   1856       2       7           2       0       8      16704        0
 epoch_record pcpu    256       4      60           4       0      62      16384        0
      malloc-16384  16384       1       0           1       0       1      16384        0
       malloc-8192   8192       1       1           2       0       1      16384        0
       malloc-4096   4096       0       4          18       0       2      16384        0
       malloc-4096   4096       2       2           8       0       2      16384        0
       malloc-1024   1024       4      12           4       0      16      16384        0
        malloc-512    512       1      31           1       0      30      16384        0
           SMR CPU     32       8     503           8       0     254      16352        0
      vtnet_tx_hdr     24       0     668        9261       0     254      16032        0
         malloc-16     16     538     462        3485       0     254      16000        0
            mqueue    248       1      63           1       0      62      15872        0
              kenv    258      17      43        1072       0      30      15480        0
        SMR SHARED     24       8     503           8       0     254      12264        0
         malloc-32     32      72     306         849       0     254      12096        0
             KNOTE    160       0      75         112       0      62      12000        0
         malloc-16     16      19     731        1122       0     254      12000        0
         malloc-16     16      24     726         430       0     254      12000        0
         malloc-16     16      10     740       21858       0     254      12000        0
         malloc-16     16      38     712       25257       0     254      12000        0
         malloc-16     16     101     649        4729       0     254      12000        0
         malloc-16     16      31     719         301       0     254      12000        0
            splice    184       0      63           2       0      62      11592        0
       malloc-8192   8192       0       1           1       0       1       8192        0
           pcpu-16     16       8     504           8       0     254       8192        0
       UMA Slabs 1    176       9      13           9       0      62       3872        0
        KMAP ENTRY     96      12      27          20       0       0       3744        0
               tfo      4       0     493           1       0     254       1972        0
               md0      1       0       0           0       0     254          0        0
              md12      1       0       0           0       0     254          0        0
              md11    512       0       0           0       0      30          0        0
               md8    512       0       0           0       0      30          0        0
               md7    512       0       0           0       0      30          0        0
               md5    512       0       0           0       0      30          0        0
               md4    512       0       0           0       0      30          0        0
               md3    512       0       0           0       0      30          0        0
               md2    512       0       0           0       0      30          0        0
        md33554944    512       0       0           0       0      30          0        0
       FFS1 dinode    128       0       0           0       0     126          0        0
           ada_ccb    272       0       0           0       0      30          0        0
             swblk    136       0       0           0       0      62          0        0
          swpctrie    144       0       0           0       0      62          0        0
   cdg_qdiffsample     16       0       0           0       0     254          0        0
   pf state scrubs     40       0       0           0       0     254          0        0
   pf frag entries     40       0       0           0       0       8          0        0
          pf frags    256       0       0           0       0      62          0        0
  pf table entries    160       0       0           0       0     254          0        0
pf table entry counters     64       0       0           0       0     254          0        0
   pf UDP mappings    104       0       0           0       0     126          0        0
   pf source nodes    152       0       0           0       0     254          0        0
     pf state keys     88       0       0           0       0     126          0        0
         pf states    368       0       0           0       0     254          0        0
           pf tags    104       0       0           0       0     126          0        0
          pf mtags    184       0       0           0       0      62          0        0
tfo_ccache_entries     80       0       0           0       0     126          0        0
          sackhole     32       0       0           0       0     254          0        0
   sctp_asconf_ack     48       0       0           0       0     254          0        0
       sctp_asconf     40       0       0           0       0     254          0        0
        sctp_readq    152       0       0           0       0     254          0        0
          tcpreass     48       0       0           0       0     254          0        0
       ripcb ports     32       0       0           0       0     254          0        0
    IPsec SA lft_c     16       0       0           0       0     254          0        0
        mqnotifier    216       0       0           0       0      62          0        0
            mvdata     64       0       0           0       0     254          0        0
        TMPFS node    240       0       0           0       0      62          0        0
           NCLNODE    608       0       0           0       0      16          0        0
     LTS VFS Cache    360       0       0           0       0      30          0        0
     STS VFS Cache    144       0       0           0       0      62          0        0
  linux_dma_object     32       0       0           0       0     254          0        0
  linux_dma_pctrie    144       0       0           0       0      62          0        0
   IOMMU_MAP_ENTRY    112       0       0           0       0     126          0        0
    mbuf_jumbo_16k  16384       0       0           0       0     254          0        0
     mbuf_jumbo_9k   9216       0       0           0       0     254          0        0
      audit_record   1280       0       0           0       0       8          0        0
        MAC labels     40       0       0           0       0     254          0        0
            vnpbuf   2624       0       0           0       0      16          0        0
           nfspbuf   2624       0       0           0       0       4          0        0
            swwbuf   2624       0       0           0       0       2          0        0
            swrbuf   2624       0       0           0       0       4          0        0
          umtx_shm     88       0       0           0       0     126          0        0
           umtx pi     96       0       0           0       0     126          0        0
rangeset pctrie nodes    144       0       0           0       0      62          0        0
      malloc-65536  65536       0       0           0       0       1          0        0
      malloc-65536  65536       0       0           0       0       1          0        0
      malloc-65536  65536       0       0           0       0       1          0        0
      malloc-16384  16384       0       0           0       0       1          0        0
      malloc-16384  16384       0       0           0       0       1          0        0
           pcpu-32     32       0       0           0       0     254          0        0
            pcpu-4      4       0       0           0       0     254          0        0
            fakepg    104       0       0           0       0     126          0        0
          UMA Hash    256       0       0           0       0      62          0        0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/05 16:35 freebsd-src 194bb58b80c1 577d049b console log report ci-freebsd-i386 panic: Empty stailq ADDR->stqh_last is ADDR, not head's first field address
* Struck through repros no longer work on HEAD.