syzbot


panic: _mtx_lock_sleep: recursed on non-recursive mutex sctp-send-tcb @ /syzkaller/managers/i386/kernel/sys/netinet/sctp

Status: fixed on 2021/09/29 10:05
Reported-by: syzbot+f048680690f2e8d7ddad@syzkaller.appspotmail.com
Fix commit: 171633765c43 sctp: avoid locking an already locked mutex
First crash: 497d, last: 495d

Sample crash report:
panic: _mtx_lock_sleep: recursed on non-recursive mutex sctp-send-tcb @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_input.c:189

cpuid = 0
time = 1632875096
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc7/frame 0xfffffe0053b60b90
kdb_backtrace() at kdb_backtrace+0xd3/frame 0xfffffe0053b60cf0
vpanic() at vpanic+0x2c5/frame 0xfffffe0053b60dd0
panic() at panic+0xb5/frame 0xfffffe0053b60e90
__mtx_lock_sleep() at __mtx_lock_sleep+0xa4b/frame 0xfffffe0053b60fd0
__mtx_lock_flags() at __mtx_lock_flags+0x22e/frame 0xfffffe0053b610b0
sctp_is_there_unsent_data() at sctp_is_there_unsent_data+0x41/frame 0xfffffe0053b61150
sctp_med_chunk_output() at sctp_med_chunk_output+0x310/frame 0xfffffe0053b61d00
sctp_chunk_output() at sctp_chunk_output+0x2b25/frame 0xfffffe0053b62950
sctp_heartbeat_timer() at sctp_heartbeat_timer+0x5fa/frame 0xfffffe0053b62a50
sctp_timeout_handler() at sctp_timeout_handler+0xb5a/frame 0xfffffe0053b62b90
softclock_call_cc() at softclock_call_cc+0x3d9/frame 0xfffffe0053b62d40
softclock() at softclock+0x152/frame 0xfffffe0053b62d90
ithread_loop() at ithread_loop+0x4f1/frame 0xfffffe0053b62ef0
fork_exit() at fork_exit+0xd0/frame 0xfffffe0053b62f30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0053b62f30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 12 tid 100034 ]
Stopped at      kdb_enter+0x6b: movq    $0,0x28e03da(%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         0xfd9aeeb85aeb6d34
rdx                        0x1
rbx                          0
rsp         0xfffffe0053b60cd0
rbp         0xfffffe0053b60cf0
rsi                          0
rdi         0xffffffff817bc96a  vprintf+0x35a
r8                           0
r9          0xfffffe0053b60808
r10                          0
r11         0xfffffe009e9c9c30
r12         0xfffffe0053e3b1e0
r13         0xfffffe0053b60d01
r14         0xffffffff82c7fe60  .str.18
r15         0xffffffff82c7fe60  .str.18
rip         0xffffffff817b02db  kdb_enter+0x6b
rflags                    0x46
kdb_enter+0x6b: movq    $0,0x28e03da(%rip)
db> show proc
Process 12 (intr) at 0xfffffe0053dfda70:
 state: NORMAL
 uid: 0  gids: 0
 parent: pid 0 at 0xffffffff84031a80
 ABI: null
 flag: 0x10000284  flag2: 0
 reaper: 0xffffffff84031a80 reapsubtree: 12
 sigparent: 20
 vmspace: 0xffffffff84032a00
   (map 0xffffffff84032a00)
   (map.pmap 0xffffffff84032ac0)
   (pmap 0xffffffff84032b20)
 threads: 23
100011                   I                                   [swi6: task queue]
100012                   I                                   [swi6: Giant taskq]
100014                   I                                   [swi5: fast taskq]
100032                   I                                   [swi1: netisr 0]
100033                   I                                   [swi3: vm]
100034                   Run     CPU 0                       [swi4: clock (0)]
100035                   I                                   [swi4: clock (1)]
100036                   I                                   [swi1: hpts]
100037                   I                                   [swi1: hpts]
100050                   I                                   [irq24: virtio_pci0]
100051                   I                                   [irq25: virtio_pci0]
100052                   I                                   [irq26: virtio_pci0]
100053                   I                                   [irq27: virtio_pci0]
100054                   I                                   [irq28: virtio_pci1]
100055                   I                                   [irq29: virtio_pci1]
100056                   I                                   [irq30: virtio_pci1]
100057                   I                                   [irq31: virtio_pci1]
100058                   I                                   [irq32: virtio_pci1]
100063                   I                                   [irq10: virtio_pci2]
100065                   I                                   [irq1: atkbd0]
100066                   I                                   [irq12: psm0]
100067                   I                                   [swi0: uart uart++]
100075                   I                                   [swi1: pf send]
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
 1143   789   789     0  R       (threaded)                  syz-executor.3
100271                   RunQ                                syz-executor.3
100444                   S       connec  0xfffffe00a2db8c1a  syz-executor.3
100450                   S       uwait   0xfffffe009e49a100  syz-executor.3
 1139   785   785     0  R       (threaded)                  syz-executor.2
100145                   RunQ                                syz-executor.2
100442                   S       connec  0xfffffe00a2d4249a  syz-executor.2
100449                   S       uwait   0xfffffe009e49a400  syz-executor.2
  888     1   888     0  Ss      select  0xfffffe009e9e7340  rtsol
  886     1   886     0  Ss      select  0xfffffe00a2c799c0  rtsol
  885     1   885     0  Ss      select  0xfffffe00a2c79a40  rtsol
  879   802   436     0  S       kqread  0xfffffe00587ac000  rtsol
  802   787   436     0  S       wait    0xfffffe005895f000  sh
  789   780   789     0  Ss      nanslp  0xffffffff8405d5c1  syz-executor.3
  787   436   436     0  S       wait    0xfffffe009e56d000  sh
  785   780   785     0  Ss      nanslp  0xffffffff8405d5c1  syz-executor.2
  783   780   783     0  Ss      piperd  0xfffffe009e9d42e8  syz-executor.1
  782   780   782     0  Ss      piperd  0xfffffe00588d8000  syz-executor.0
  780   778   778     0  S       (threaded)                  syz-fuzzer
100118                   S       uwait   0xfffffe0058b59000  syz-fuzzer
100120                   S       uwait   0xfffffe0057026000  syz-fuzzer
100121                   S       uwait   0xfffffe0058552100  syz-fuzzer
100122                   S       uwait   0xfffffe0058552200  syz-fuzzer
100123                   S       uwait   0xfffffe0058552300  syz-fuzzer
100124                   S       kqread  0xfffffe0058963a00  syz-fuzzer
100125                   S       uwait   0xfffffe0058552600  syz-fuzzer
100126                   S       uwait   0xfffffe0057026a00  syz-fuzzer
100127                   S       uwait   0xfffffe009e9ced80  syz-fuzzer
  778   776   778     0  Ss      pause   0xfffffe009e50d5e8  csh
  776   694   776     0  Ss      select  0xfffffe0058b0d240  sshd
  760     1   760     0  Ss+     ttyin   0xfffffe0057014cb0  getty
  759     1   759     0  Ss+     ttyin   0xfffffe00575f74b0  getty
  758     1   758     0  Ss+     ttyin   0xfffffe00575f7cb0  getty
  757     1   757     0  Ss+     ttyin   0xfffffe00575f44b0  getty
  756     1   756     0  Ss+     ttyin   0xfffffe00575f4cb0  getty
  755     1   755     0  Ss+     ttyin   0xfffffe00575f04b0  getty
  754     1   754     0  Ss+     ttyin   0xfffffe00575f0cb0  getty
  753     1   753     0  Ss+     ttyin   0xfffffe00575eb4b0  getty
  752     1   752     0  Ss+     ttyin   0xfffffe00575ebcb0  getty
  750     1    24     0  S+      piperd  0xfffffe00588d88b8  logger
  749   748    24     0  S+      nanslp  0xffffffff8405d5c1  sleep
  748     1    24     0  S+      wait    0xfffffe009e3ad538  sh
  698     1   698     0  Ss      nanslp  0xffffffff8405d5c1  cron
  694     1   694     0  Ss      select  0xfffffe0058b0d3c0  sshd
  507     1   507     0  Ss      select  0xfffffe0058b0d940  syslogd
  436     1   436     0  Ss      wait    0xfffffe0058956000  devd
  435     1   435    65  Ss      select  0xfffffe0058b0d8c0  dhclient
  350     1   350     0  Ss      select  0xfffffe0058b0dbc0  dhclient
  347     1   347     0  Ss      select  0xfffffe005742d540  dhclient
   23     0     0     0  DL      syncer  0xffffffff84185960  [syncer]
   22     0     0     0  DL      vlruwt  0xfffffe0058558538  [vnlru]
   21     0     0     0  DL      (threaded)                  [bufdaemon]
100085                   D       qsleep  0xffffffff84183660  [bufdaemon]
100088                   D       -       0xffffffff83411f80  [bufspacedaemon-0]
100099                   D       sdflush 0xfffffe00588484e8  [/ worker]
   20     0     0     0  DL      psleep  0xffffffff841bbb80  [vmdaemon]
   19     0     0     0  DL      (threaded)                  [pagedaemon]
100083                   D       psleep  0xffffffff841af6b8  [dom0]
100089                   D       launds  0xffffffff841af6c4  [laundry: dom0]
100090                   D       umarcl  0xffffffff81eb2b10  [uma]
   18     0     0     0  DL      -       0xffffffff83e13ca0  [rand_harvestq]
   17     0     0     0  DL      waiting 0xffffffff84bcc5a0  [sctp_iterator]
   16     0     0     0  DL      pftm    0xffffffff84d971a0  [pf purge]
   15     0     0     0  DL      -       0xffffffff8417e880  [soaiod4]
    9     0     0     0  DL      -       0xffffffff8417e880  [soaiod3]
    8     0     0     0  DL      -       0xffffffff8417e880  [soaiod2]
    7     0     0     0  DL      -       0xffffffff8417e880  [soaiod1]
    6     0     0     0  DL      (threaded)                  [cam]
100048                   D       -       0xffffffff83c99540  [doneq0]
100049                   D       -       0xffffffff83c994c0  [async]
100082                   D       -       0xffffffff83c99340  [scanner]
   14     0     0     0  DL      seqstat 0xfffffe0056ac8c88  [sequencer 00]
    5     0     0     0  DL      crypto_ 0xfffffe00541c9d80  [crypto returns 1]
    4     0     0     0  DL      crypto_ 0xfffffe00541c9d30  [crypto returns 0]
    3     0     0     0  DL      crypto_ 0xffffffff841a9760  [crypto]
   13     0     0     0  DL      (threaded)                  [geom]
100039                   D       -       0xffffffff84030b80  [g_event]
100040                   D       -       0xffffffff84030bc0  [g_up]
100041                   D       -       0xffffffff84030c00  [g_down]
    2     0     0     0  DL      (threaded)                  [KTLS]
100029                   D       -       0xfffffe00081f6d00  [thr_0]
100030                   D       -       0xfffffe00081f6d80  [thr_1]
100031                   D       -       0xffffffff8417fc08  [alloc_0]
   12     0     0     0  RL      (threaded)                  [intr]
100011                   I                                   [swi6: task queue]
100012                   I                                   [swi6: Giant taskq]
100014                   I                                   [swi5: fast taskq]
100032                   I                                   [swi1: netisr 0]
100033                   I                                   [swi3: vm]
100034                   Run     CPU 0                       [swi4: clock (0)]
100035                   I                                   [swi4: clock (1)]
100036                   I                                   [swi1: hpts]
100037                   I                                   [swi1: hpts]
100050                   I                                   [irq24: virtio_pci0]
100051                   I                                   [irq25: virtio_pci0]
100052                   I                                   [irq26: virtio_pci0]
100053                   I                                   [irq27: virtio_pci0]
100054                   I                                   [irq28: virtio_pci1]
100055                   I                                   [irq29: virtio_pci1]
100056                   I                                   [irq30: virtio_pci1]
100057                   I                                   [irq31: virtio_pci1]
100058                   I                                   [irq32: virtio_pci1]
100063                   I                                   [irq10: virtio_pci2]
100065                   I                                   [irq1: atkbd0]
100066                   I                                   [irq12: psm0]
100067                   I                                   [swi0: uart uart++]
100075                   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    0xfffffe0053d60538  [init]
   10     0     0     0  DL      audit_w 0xffffffff841aa700  [audit]
    0     0     0     0  DLs     (threaded)                  [kernel]
100000                   D       swapin  0xffffffff84031a80  [swapper]
100005                   D       -       0xfffffe00081f8900  [softirq_0]
100006                   D       -       0xfffffe00081f8700  [softirq_1]
100007                   D       -       0xfffffe00081f8500  [if_io_tqg_0]
100008                   D       -       0xfffffe00081f8300  [if_io_tqg_1]
100009                   D       -       0xfffffe00081f8100  [if_config_tqg_0]
100010                   D       -       0xfffffe0053dfce00  [deferred_unmount ta]
100013                   D       -       0xfffffe0053dfc800  [thread taskq]
100015                   D       -       0xfffffe0053dfc400  [linuxkpi_irq_wq]
100016                   D       -       0xfffffe0053dfc200  [kqueue_ctx taskq]
100017                   D       -       0xfffffe0053dfc000  [pci_hp taskq]
100018                   D       -       0xfffffe0053e06d00  [aiod_kick taskq]
100019                   D       -       0xfffffe0053e06b00  [inm_free taskq]
100020                   D       -       0xfffffe0053e06900  [in6m_free taskq]
100021                   D       -       0xfffffe0053e06700  [linuxkpi_short_wq_0]
100022                   D       -       0xfffffe0053e06700  [linuxkpi_short_wq_1]
100023                   D       -       0xfffffe0053e06700  [linuxkpi_short_wq_2]
100024                   D       -       0xfffffe0053e06700  [linuxkpi_short_wq_3]
100025                   D       -       0xfffffe0053e06200  [linuxkpi_long_wq_0]
100026                   D       -       0xfffffe0053e06200  [linuxkpi_long_wq_1]
100027                   D       -       0xfffffe0053e06200  [linuxkpi_long_wq_2]
100028                   D       -       0xfffffe0053e06200  [linuxkpi_long_wq_3]
100038                   D       -       0xfffffe0053e14200  [firmware taskq]
100042                   D       -       0xfffffe005419ec00  [crypto_0]
100043                   D       -       0xfffffe005419ec00  [crypto_1]
100059                   D       -       0xfffffe0056ec3b00  [vtnet0 rxq 0]
100060                   D       -       0xfffffe0056ec3a00  [vtnet0 txq 0]
100061                   D       -       0xfffffe0056ec3900  [vtnet0 rxq 1]
100062                   D       -       0xfffffe0056ec3800  [vtnet0 txq 1]
100064                   D       vtbslp  0xfffffe0056ff6600  [virtio_balloon]
100068                   D       -       0xfffffe0057027800  [mca taskq]
100073                   D       -       0xffffffff82c86de0  [deadlkres]
100077                   D       -       0xfffffe0057400600  [acpi_task_0]
100078                   D       -       0xfffffe0057400600  [acpi_task_1]
100079                   D       -       0xfffffe0057400600  [acpi_task_2]
100081                   D       -       0xfffffe005419e400  [CAM taskq]
db> show all locks
Process 12 (intr) thread 0xfffffe0053e3b1e0 (100034)
exclusive sleep mutex sctp-send-tcb (tcbs) r = 0 (0xfffffe00a2dab8d0) locked @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_timer.c:1356
exclusive sleep mutex sctp-tcb (tcb) r = 0 (0xfffffe00a2dab8b0) locked @ /syzkaller/managers/i386/kernel/sys/netinet/sctputil.c:1770
db> show malloc
              Type        InUse        MemUse     Requests
           pf_hash            5        11524K            5
            devbuf         4213         4323K         4238
          tcp_hpts            6         3201K            6
         sysctloid        35175         2072K        35246
             vtbuf           24         1968K           46
              kobj          326         1304K          483
            newblk          640         1184K          958
          vfscache            3         1025K            3
          inodedep          135          563K          362
               pcb           34          544K          740
         ufs_quota            1          512K            1
          vfs_hash            1          512K            1
           callout            2          512K            2
              intr            4          472K            4
           subproc          128          259K         1216
            acpica         1674          184K        55237
         vnet_data            1          168K            1
              vmem            3          146K            4
           tidhash            3          141K            3
            linker          355          140K          383
           pagedep           20          133K          300
        tfo_ccache            1          128K            1
            DEVFS1          108          108K          125
               sem            4          106K            4
          filedesc           14          105K          605
               bus          986           80K         3474
          mtx_pool            2           72K            2
          syncache            1           68K            1
          acpitask            1           64K            1
       ddb_capture            1           64K            1
            module          509           64K          509
              umtx          330           42K          330
           kdtrace          206           41K         1597
              temp           34           33K         1911
         hostcache            1           32K            1
               shm            1           32K            1
            DEVFS3          127           32K          137
               msg            4           30K            4
        gtaskqueue           18           26K           18
            dirrem           94           24K          298
            kbdmux            6           22K            6
        DEVFS_RULE           56           20K           56
            ifaddr           67           19K           69
               BPF           14           19K           14
         ufs_mount            4           17K            5
              proc            3           17K            3
          routetbl          134           17K          426
               tty           16           16K           16
           ithread           99           16K           99
            bus-sc           34           15K         1691
           lltable           44           14K           44
          freefile          103           13K          292
       ether_multi          157           13K          167
            KTRACE          100           13K          100
             ifnet            7           13K            7
              kenv           95           12K           95
      eventhandler          133           12K          133
         CAM queue            5           11K         1528
              GEOM           61           10K          487
              rman           84           10K          425
         in6_multi           71            9K           71
         bmsafemap            2            9K          331
            kqueue           62            9K         1152
              UART           12            9K           12
           devstat            4            9K            4
         sctp_timw           32            8K           32
              ksem            1            8K            1
               rpc            2            8K            2
             shmfd            1            8K            1
       pfs_vncache            1            8K            1
         pfs_nodes           20            8K           20
     audit_evclass          237            8K          295
         taskqueue           63            7K           63
            sglist            5            7K            5
           CAM DEV            3            6K          510
              cred           24            6K          196
            plimit           21            6K          333
       ufs_dirhash           24            5K           24
            DEVFSP           72            5K           87
               UMA          270            5K          270
          pf_ifnet           10            5K           19
                vt           11            5K           11
           memdesc            1            4K            1
               MCA           32            4K           32
             evdev            4            4K            4
          kcovinfo           64            4K           68
            diradd           30            4K          329
           pwddesc           58            4K         1146
           acpisem           28            4K           28
           session           27            4K           36
             hhook           15            4K           17
         sctp_stro            3            3K          185
          terminal           11            3K           11
         proc-args           49            3K          552
         sctp_atcl            7            3K          509
             mkdir           21            3K          580
          indirdep           10            3K           10
           uidinfo            3            3K            7
        local_apic            1            2K            1
           io_apic            1            2K            1
       fpukern_ctx            2            2K            2
         newdirblk           16            2K          290
         ipsec-saq            2            2K            2
             selfd           32            2K        17075
            ip6ndp           12            2K           15
          sctp_ifa           14            2K           15
            Unitno           29            2K           47
           CAM XPT           22            2K          543
             lockf           15            2K           22
          in_multi            6            2K            8
            select           11            2K           32
       ipsecpolicy            2            2K            2
           acpidev           20            2K           20
               msi            9            2K            9
             clone            9            2K            9
               tun            7            2K            7
          freework            5            2K          296
           softdep            1            1K            1
          freeblks            4            1K          295
            sahead            1            1K            1
          secasvar            1            1K            1
             nhops            6            1K            8
       vnodemarker            2            1K           10
      NFSD session            1            1K            1
        CAM periph            4            1K          271
          sctp_ifn            6            1K           15
             ipsec            3            1K            3
               mld            6            1K            6
              igmp            6            1K            6
         toponodes            6            1K            6
            isadev            6            1K            6
             mount           16            1K           89
          pci_link           10            1K           10
            crypto            4            1K            4
 encap_export_host           12            1K           12
         sctp_stri            1            1K           14
              pfil            4            1K            4
          procdesc            4            1K           10
              cdev            2            1K            2
         sctp_atky           10            1K          717
       inpcbpolicy           14            1K          225
               osd            8            1K           50
    chacha20random            1            1K            1
      NFSD lckfile            1            1K            1
     NFSD V4client            1            1K            1
             DEVFS            9            1K           10
            vnodes            1            1K            1
           CAM SIM            2            1K            2
              ktls            1            1K            1
            feeder            7            1K            7
           tcpfunc            3            1K            3
        loginclass            3            1K            6
            prison            6            1K            6
       lkpikmalloc            5            1K            6
        aesni_data            2            1K            2
            soname            6            1K         3700
          nexusdev            8            1K            8
            apmdev            1            1K            1
          atkbddev            2            1K            2
     CAM dev queue            2            1K            2
             xform            2            1K           49
 CAM I/O Scheduler            1            1K            1
          CAM path            4            1K         1034
          pmchooks            1            1K            1
         sctp_athm            7            1K          516
          filecaps            4            1K           78
          sctp_map            6            1K          370
          sctp_vrf            1            1K            1
              vnet            1            1K            1
           entropy            2            1K           38
          acpiintr            1            1K            1
               pmc            1            1K            1
              cpus            2            1K            2
    vnet_data_free            1            1K            1
           Per-cpu            1            1K            1
          p1003.1b            1            1K            1
          pf_table            0            0K            0
           pf_rule            0            0K            0
           pf_altq            0            0K            0
           pf_osfp            0            0K            0
           pf_temp            0            0K            0
        sctp_mcore            0            0K            0
        sctp_socko            0            0K          268
         sctp_iter            0            0K           12
         sctp_mvrf            0            0K            0
         sctp_cpal            0            0K            0
         sctp_cmsg            0            0K            0
         sctp_stre            0            0K            0
         sctp_athi            0            0K            0
         sctp_a_it            0            0K           12
         sctp_aadr            0            0K            0
            tcp_do            0            0K            0
           tcp_fsb            0            0K           24
            mqdata            0            0K            0
         htcp data            0            0K            0
        cubic data            0            0K            0
        dctcp data            0            0K            0
          cdg data            0            0K            0
          chd data            0            0K            0
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db> show uma
              Zone   Size    Used    Free    Requests  Sleeps  Bucket  Total Mem    XFree
   mbuf_jumbo_page   4096    8320     957      196888       0     254   37998592        0
              pbuf   2624       0     973           0       0       2    2553152        0
              mbuf    256    8646     894      294743       0     254    2442240        0
        malloc-384    384    4303     127        4531       0      30    1701120        0
          BUF TRIE    144     185   11575         519       0      62    1693440        0
       malloc-4096   4096     386       5        1634       0       2    1601536        0
        malloc-128    128   11832      41       11929       0     126    1519744        0
       UMA Slabs 0    112   10254       3       10254       0     126    1148784        0
        RADIX NODE    144    7033     186       38739       0      62    1039536        0
         vmem btag     56   15929      30       15929       0     254     893704        0
         FFS inode   1160     506      40         798       0       8     633360        0
      mbuf_cluster   2048     285       1         285       0     254     585728        0
      malloc-65536  65536       6       0           6       0       1     393216        0
            lkpimm    168       1    2327           1       0      62     391104        0
          lkpicurr    168       2    2326           2       0      62     391104        0
         VM OBJECT    264    1152      78       17931       0      30     324720        0
            THREAD   1808     147      18         450       0       8     298320        0
         malloc-64     64    4479      57        6858       0     254     290304        0
             VNODE    448     543      78         837       0      30     278208        0
        malloc-256    256    1006      74        2707       0      62     276480        0
        256 Bucket   2048     124       4       12127       0       8     262144        0
         malloc-16     16   14755     245       16401       0     254     240000        0
            DEVCTL   1024      23     197         151       0       0     225280        0
      malloc-65536  65536       1       2          67       0       1     196608        0
      malloc-65536  65536       1       2         137       0       1     196608        0
      malloc-16384  16384       6       6         300       0       1     196608        0
         UMA Zones    768     242       2         242       0      16     187392        0
         malloc-32     32    5598     198        6381       0     254     185472        0
         MAP ENTRY     96    1380     342       57672       0     126     165312        0
        malloc-128    128    1222      49       26361       0     126     162688        0
     FPU_save_area    832     149      22        3764       0      16     142272        0
       malloc-1024   1024     133       3         150       0      16     139264        0
        malloc-128    128    1064      21        5326       0     126     138880        0
       FFS2 dinode    256     506      34         798       0      62     138240        0
       S VFS Cache    104     998     250        1305       0     126     129792        0
          ksiginfo    112      52     992        3373       0     126     116928        0
           VMSPACE   2544      35      10        1129       0       4     114480        0
      malloc-32768  32768       1       2         131       0       1      98304        0
              PROC   1336      57      12        1145       0       8      92184        0
       malloc-8192   8192       9       2         110       0       1      90112        0
       malloc-2048   2048      13      31         578       0       8      90112        0
          UMA Kegs    384     227       6         227       0      30      89472        0
            clpbuf   2624       0      32          23       0      16      83968        0
         filedesc0   1072      58      19        1146       0       8      82544        0
             g_bio    408       0     190        4841       0      30      77520        0
       malloc-8192   8192       8       1          10       0       1      73728        0
       mbuf_packet    256       6     279        1034       0     254      72960        0
        malloc-256    256     152     118         810       0      62      69120        0
      malloc-65536  65536       1       0           1       0       1      65536        0
      malloc-65536  65536       0       1           8       0       1      65536        0
       malloc-4096   4096      14       1          27       0       2      61440        0
        malloc-256    256      46     194         293       0      62      61440        0
       malloc-8192   8192       4       3          32       0       1      57344        0
       malloc-2048   2048      11      17         325       0       8      57344        0
         sctp_asoc   2288       3      22         185       0     254      57200        0
        128 Bucket   1024      43      12         706       0      16      56320        0
            socket    960      32      24        1773       0     254      53760        0
      malloc-16384  16384       3       0           3       0       1      49152        0
      malloc-16384  16384       2       1          17       0       1      49152        0
      malloc-16384  16384       1       2         161       0       1      49152        0
       malloc-2048   2048       2      22         575       0       8      49152        0
       malloc-1024   1024      10      34        1551       0      16      45056        0
         malloc-64     64     517     176        1629       0     254      44352        0
         32 Bucket    256      55     110        7255       0      62      42240        0
            pcpu-8      8    4645     475        4801       0     254      40960        0
           DIRHASH   1024      34       2          34       0      16      36864        0
             NAMEI   1024       0      36       14290       0      16      36864        0
       malloc-4096   4096       8       1          10       0       2      36864        0
         64 Bucket    512      60      12        2317       0      30      36864        0
        malloc-128    128     135     144         480       0     126      35712        0
        malloc-384    384      73      17         122       0      30      34560        0
            da_ccb    544       0      63        1331       0      16      34272        0
      malloc-32768  32768       1       0           1       0       1      32768        0
      malloc-32768  32768       1       0           1       0       1      32768        0
           pcpu-64     64     487      25         487       0     254      32768        0
        malloc-128    128      61     187         323       0     126      31744        0
        malloc-384    384      38      42         540       0      30      30720        0
       malloc-4096   4096       4       3           7       0       2      28672        0
         malloc-64     64     101     340        1757       0     254      28224        0
           sctp_ep   1272       3      18         317       0     254      26712        0
         TURNSTILE    136     166      23         166       0      62      25704        0
       malloc-1024   1024       4      20         186       0      16      24576        0
        sctp_raddr    736       8      25         204       0     254      24288        0
    ertt_txseginfo     40       0     606        1971       0     254      24240        0
             KNOTE    160      31     119       11962       0      62      24000        0
            ttyinq    160     135      15         300       0      62      24000        0
          8 Bucket     80      47     253         898       0     126      24000        0
           ttyoutq    256      72      18         160       0      62      23040        0
        malloc-384    384      54       6          56       0      30      23040        0
        malloc-256    256      82       8         439       0      62      23040        0
        malloc-256    256      58      32        1128       0      62      23040        0
             tcpcb   1080       4      17          39       0     254      22680        0
              pipe    744      20      10         335       0      16      22320        0
       malloc-4096   4096       5       0           5       0       2      20480        0
       malloc-4096   4096       3       2        1098       0       2      20480        0
         malloc-64     64     224      91         295       0     254      20160        0
         16 Bucket    144      47      93         333       0      62      20160        0
             Files     80     197      53        7939       0     126      20000        0
        malloc-128    128     110      45         435       0     126      19840        0
       Mountpoints   2752       2       5           2       0       4      19264        0
        malloc-256    256      67       8         388       0      62      19200        0
        SLEEPQUEUE     88     166      26         166       0     126      16896        0
      malloc-16384  16384       1       0           1       0       1      16384        0
      malloc-16384  16384       1       0           1       0       1      16384        0
       malloc-2048   2048       2       6          26       0       8      16384        0
       malloc-1024   1024       8       8          12       0      16      16384        0
        malloc-512    512       0      32         131       0      30      16384        0
               PWD     32      16     488         376       0     254      16128        0
         malloc-64     64      77     175       30776       0     254      16128        0
         malloc-64     64     166      86         206       0     254      16128        0
         malloc-32     32      88     416         805       0     254      16128        0
        malloc-384    384      22      18         362       0      30      15360        0
        malloc-256    256      25      35         193       0      62      15360        0
      tcp_rack_pcb    832       0      18          24       0      16      14976        0
       malloc-2048   2048       3       3         194       0       8      12288        0
       malloc-1024   1024       8       4         183       0      16      12288        0
       malloc-1024   1024       7       5           7       0      16      12288        0
         malloc-64     64      56     133         373       0     254      12096        0
         malloc-32     32      88     290        4334       0     254      12096        0
      vtnet_tx_hdr     24       0     501       94310       0     254      12024        0
         udp_inpcb    496       6      18         174       0     254      11904        0
        malloc-128    128      60      33         531       0     126      11904        0
              kenv    258      15      30        1026       0      30      11610        0
     routing nhops    256      26      19          34       0      62      11520        0
             unpcb    256      14      31        1205       0     254      11520        0
       malloc-8192   8192       1       0           1       0       1       8192        0
       malloc-8192   8192       1       0           1       0       1       8192        0
       malloc-8192   8192       1       0           1       0       1       8192        0
       malloc-8192   8192       1       0           1       0       1       8192        0
       malloc-2048   2048       3       1           3       0       8       8192        0
       malloc-2048   2048       3       1           3       0       8       8192        0
       malloc-2048   2048       2       2           4       0       8       8192        0
       malloc-1024   1024       2       6          11       0      16       8192        0
        malloc-512    512       0      16           6       0      30       8192        0
        malloc-512    512       5      11          72       0      30       8192        0
        malloc-512    512       8       8           8       0      30       8192        0
           rtentry    176      30      16          34       0      62       8096        0
              PGRP     88      27      65          36       0     126       8096        0
          rl_entry     40      38     164          38       0     254       8080        0
        sctp_laddr     48       0     168         201       0     254       8064        0
             udpcb     32       6     246         174       0     254       8064        0
              ertt     72       4     108          39       0     126       8064        0
         malloc-64     64      65      61         270       0     254       8064        0
         malloc-32     32     132     120         285       0     254       8064        0
         malloc-32     32      61     191          77       0     254       8064        0
         malloc-32     32      42     210         595       0     254       8064        0
         malloc-32     32      54     198         232       0     254       8064        0
         malloc-32     32      17     235          48       0     254       8064        0
          4 Bucket     48       6     162          65       0     254       8064        0
          2 Bucket     32      49     203         565       0     254       8064        0
         malloc-16     16       0     500           7       0     254       8000        0
         malloc-16     16      25     475         210       0     254       8000        0
         malloc-16     16      58     442         356       0     254       8000        0
         malloc-16     16      21     479         585       0     254       8000        0
         malloc-16     16      39     461         176       0     254       8000        0
         malloc-16     16     286     214       25355       0     254       8000        0
         malloc-16     16       4     496         215       0     254       8000        0
             ripcb    496       4      12          12       0     254       7936        0
         tcp_inpcb    496       4      12          39       0     254       7936        0
        malloc-128    128      36      26          51       0     126       7936        0
        sctp_chunk    152       5      47          17       0     254       7904        0
        malloc-384    384       0      20           6       0      30       7680        0
        malloc-256    256      13      17         567       0      62       7680        0
            cpuset    104       8      54           8       0     126       6448        0
 epoch_record pcpu    256       4      12           4       0      62       4096        0
       malloc-4096   4096       0       1           1       0       2       4096        0
       malloc-4096   4096       0       1           3       0       2       4096        0
       malloc-1024   1024       1       3           1       0      16       4096        0
        malloc-512    512       4       4           4       0      30       4096        0
        malloc-512    512       1       7          14       0      30       4096        0
        malloc-512    512       5       3           5       0      30       4096        0
        malloc-512    512       0       8           1       0      30       4096        0
           pcpu-16     16       7     249           7       0     254       4096        0
sctp_stream_msg_out    112       1      35           1       0     254       4032        0
         hostcache     64       1      62           1       0     254       4032        0
          syncache    168       0      24           4       0     254       4032        0
       UMA Slabs 1    176       9      13           9       0      62       3872        0
        malloc-384    384       2       8           2       0      30       3840        0
        malloc-384    384       1       9           1       0      30       3840        0
            mqnode    416       3       6           3       0      30       3744        0
        KMAP ENTRY     96      12      27          14       0       0       3744        0
              vmem   1856       1       1           1       0       8       3712        0
           SMR CPU     32       3      60           3       0     254       2016        0
        SMR SHARED     24       3      60           3       0     254       1512        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
   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
   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     254          0        0
          pf frags    248       0       0           0       0      62          0        0
  pf table entries    160       0       0           0       0      62          0        0
pf table entry counters     64       0       0           0       0     254          0        0
   pf source nodes    136       0       0           0       0     254          0        0
     pf state keys     88       0       0           0       0     126          0        0
         pf states    312       0       0           0       0     254          0        0
           pf tags    104       0       0           0       0     126          0        0
          pf mtags     48       0       0           0       0     254          0        0
      tcp_rack_map    112       0       0           0       0     126          0        0
       tcp_bbr_pcb    832       0       0           0       0      16          0        0
       tcp_bbr_map    128       0       0           0       0     126          0        0
     udplite_inpcb    496       0       0           0       0     254          0        0
      tcp_log_node    120       0       0           0       0     126          0        0
    tcp_log_bucket    176       0       0           0       0      62          0        0
           tcp_log    416       0       0           0       0     254          0        0
          tcpreass     48       0       0           0       0     254          0        0
tfo_ccache_entries     80       0       0           0       0     126          0        0
               tfo      4       0       0           0       0     254          0        0
          sackhole     32       0       0           0       0     254          0        0
             tcptw     88       0       0           0       0     254          0        0
               ipq     56       0       0           0       0     254          0        0
    IPsec SA lft_c     16       0       0           0       0     254          0        0
            itimer    352       0       0           0       0      30          0        0
            AIOLIO    272       0       0           0       0      30          0        0
             AIOCB    552       0       0           0       0      16          0        0
              AIOP     32       0       0           0       0     254          0        0
               AIO    208       0       0           0       0      62          0        0
           NCLNODE    592       0       0           0       0      16          0        0
        TMPFS node    224       0       0           0       0      62          0        0
        mqnotifier    216       0       0           0       0      62          0        0
            mvdata     64       0       0           0       0     254          0        0
            mqueue    248       0       0           0       0      62          0        0
     LTS VFS Cache    360       0       0           0       0      30          0        0
       L VFS Cache    320       0       0           0       0      30          0        0
     STS VFS Cache    144       0       0           0       0      62          0        0
           cryptop    280       0       0           0       0      30          0        0
  linux_dma_object     24       0       0           0       0     254          0        0
  linux_dma_pctrie    144       0       0           0       0      62          0        0
   IOMMU_MAP_ENTRY    120       0       0           0       0     126          0        0
      ktls_session    192       0       0           0       0      62          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
         domainset     40       0       0           0       0     254          0        0
        MAC labels     40       0       0           0       0     254          0        0
            vnpbuf   2624       0       0           0       0      64          0        0
            mdpbuf   2624       0       0           0       0       3          0        0
           nfspbuf   2624       0       0           0       0      16          0        0
            swwbuf   2624       0       0           0       0       8          0        0
            swrbuf   2624       0       0           0       0      16          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-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       0       0           0       0       1          0        0
      malloc-32768  32768       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
       malloc-8192   8192       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 (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-freebsd-i386 2021/09/29 00:25 freebsd-src f3aa0098a82e d82cb927 console log report panic: _mtx_lock_sleep: recursed on non-recursive mutex sctp-send-tcb @ /syzkaller/managers/i386/kernel/sys/netinet/sctp
ci-freebsd-i386 2021/09/26 18:07 freebsd-src fb640be4e944 8cac236e console log report panic: _mtx_lock_sleep: recursed on non-recursive mutex sctp-send-tcb @ /syzkaller/managers/i386/kernel/sys/netinet/sctp
* Struck through repros no longer work on HEAD.