syzbot


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

Status: fixed on 2022/03/29 23:00
Reported-by: syzbot+e8dca84da3b4b82f4400@syzkaller.appspotmail.com
Fix commit: 5d0c76c7302b sctp: don't lock an already locked stcb.
First crash: 314d, last: 313d

Sample crash report:
panic: _mtx_lock_sleep: recursed on non-recursive mutex sctp-tcb @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_output.c:13379

cpuid = 0
time = 1648551526
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc7/frame 0xfffffe00927bee50
kdb_backtrace() at kdb_backtrace+0xd3/frame 0xfffffe00927befb0
vpanic() at vpanic+0x2b8/frame 0xfffffe00927bf090
panic() at panic+0xb5/frame 0xfffffe00927bf150
__mtx_lock_sleep() at __mtx_lock_sleep+0xa17/frame 0xfffffe00927bf290
__mtx_lock_flags() at __mtx_lock_flags+0x231/frame 0xfffffe00927bf370
sctp_lower_sosend() at sctp_lower_sosend+0x490b/frame 0xfffffe00927bf740
sctp_sosend() at sctp_sosend+0x72c/frame 0xfffffe00927bf9e0
sosend() at sosend+0xfc/frame 0xfffffe00927bfa50
kern_sendit() at kern_sendit+0x58a/frame 0xfffffe00927bfbc0
sendit() at sendit+0x2b0/frame 0xfffffe00927bfc10
sys_sendto() at sys_sendto+0x182/frame 0xfffffe00927bfd30
ia32_syscall() at ia32_syscall+0x419/frame 0xfffffe00927bff30
int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0xfbfbaf78
KDB: enter: panic
[ thread pid 9313 tid 111493 ]
Stopped at      kdb_enter+0x6b: movq    $0,0x270a03a(%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         0x237e8c59cfcf2376
rdx                    0x3ffff
rbx                          0
rsp         0xfffffe00927bef90
rbp         0xfffffe00927befb0
rsi                    0x40001
rdi         0xffffffff8177ac4a  vprintf+0x35a
r8                           0
r9                  0xffffffff
r10                          0
r11         0xfffffe009d1d4c50
r12         0xfffffe009d1d4740
r13         0xfffffe00927bf001
r14         0xffffffff82bb9d00  .str.26
r15         0xffffffff82bb9d00  .str.26
rip         0xffffffff8176e1db  kdb_enter+0x6b
rflags                0x200046  kernload+0x46
kdb_enter+0x6b: movq    $0,0x270a03a(%rip)
db> show proc
Process 9313 (syz-executor.1) at 0xfffffe009d1cfa90:
 state: NORMAL
 uid: 0  gids: 0, 0, 5
 parent: pid 778 at 0xfffffe0053f05548
 ABI: FreeBSD ELF32
 flag: 0x10000080  flag2: 0
 arguments: /root/syz-executor.1 exec
 reaper: 0xfffffe0053dde000 reapsubtree: 1
 sigparent: 20
 vmspace: 0xfffffe009d19a000
   (map 0xfffffe009d19a000)
   (map.pmap 0xfffffe009d19a0c0)
   (pmap 0xfffffe009d19a128)
 threads: 4
111378                   RunQ                                syz-executor.1
111483                   D       biowr   0xfffffe0007b14940  syz-executor.1
111488                   D       biowr   0xfffffe0007b0e1f0  syz-executor.1
111493                   Run     CPU 0                       syz-executor.1
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
 9320   777   777     0  R       (threaded)                  syz-executor.0
111491                   RunQ                                syz-executor.0
111492                   RunQ                                syz-executor.0
 9313   778   778     0  R       (threaded)                  syz-executor.1
111378                   RunQ                                syz-executor.1
111483                   D       biowr   0xfffffe0007b14940  syz-executor.1
111488                   D       biowr   0xfffffe0007b0e1f0  syz-executor.1
111493                   Run     CPU 0                       syz-executor.1
 9229     1   783     0  S       uwait   0xfffffe0099815e80  syz-executor.2
 8980     1   778     0  S       umtxn   0xfffffe009ab54380  syz-executor.1
 8848     1   778     0  S       uwait   0xfffffe0092339280  syz-executor.1
 8845     1   783     0  S       uwait   0xfffffe0058af7b80  syz-executor.2
 8841     1   778     0  S       uwait   0xfffffe0099815300  syz-executor.1
 8839     1   783     0  S       uwait   0xfffffe009a5bd700  syz-executor.2
 8836     1   783     0  S       uwait   0xfffffe0099816880  syz-executor.2
 8833     1   778     0  S       uwait   0xfffffe009a5ba000  syz-executor.1
 8828     1   783     0  S       uwait   0xfffffe00998e6c80  syz-executor.2
 8577     1   783     0  S       uwait   0xfffffe0099816a80  syz-executor.2
 8305     1   778     0  S       uwait   0xfffffe0058af7d00  syz-executor.1
 8186     1   778     0  S       uwait   0xfffffe0053f7c500  syz-executor.1
 8182     1   783     0  S       umtxn   0xfffffe0058af7980  syz-executor.2
 8176     1   778     0  S       uwait   0xfffffe009a5bde80  syz-executor.1
 8173     1   783     0  S       uwait   0xfffffe009ab52880  syz-executor.2
 8168     1   778     0  S       uwait   0xfffffe009233a380  syz-executor.1
 8164     1   783     0  S       umtxn   0xfffffe0058af7e80  syz-executor.2
 8156     1   783     0  S       uwait   0xfffffe009ab53900  syz-executor.2
 7569     1   791 60928  T       uwait   0xfffffe009ab52180  syz-executor.3
 7054     1  7051     0  S       uwait   0xfffffe0058af9a00  syz-executor.2
 7050     1  7048     0  S       uwait   0xfffffe0099816380  syz-executor.2
 7047     1  7046     0  S       uwait   0xfffffe0058af7480  syz-executor.2
 7045     1  7044     0  S       uwait   0xfffffe009ab52980  syz-executor.2
 7043     1  7041     0  S       uwait   0xfffffe0058af5000  syz-executor.2
 7040     1  7038     0  S       uwait   0xfffffe00998e6080  syz-executor.2
 7037     1  7036     0  S       uwait   0xfffffe0092339300  syz-executor.2
 6960     1   791     0  S       uwait   0xfffffe0058af5280  syz-executor.3
 5618     1   791     0  SV      uwait   0xfffffe00998e6f00  syz-executor.3
 5607     1   791     0  SV      uwait   0xfffffe0058a9c800  syz-executor.3
 5594     1   791     0  SV      uwait   0xfffffe00998e4780  syz-executor.3
 5581     1   791     0  SV      uwait   0xfffffe009ab52380  syz-executor.3
 4827     1   783     0  S       uwait   0xfffffe00998e3f00  syz-executor.2
 4019     1  4019    65  Ss      select  0xfffffe0099814a40  dhclient
 3910     1   778     0  S       uwait   0xfffffe0099816b80  syz-executor.1
 3905     1   777     0  S       uwait   0xfffffe0058af9880  syz-executor.0
 3899     1   778     0  S       uwait   0xfffffe0092339a00  syz-executor.1
 3893     1   777     0  S       umtxn   0xfffffe009233a500  syz-executor.0
 3889     1   778     0  S       uwait   0xfffffe00998e5880  syz-executor.1
 3883     1   777     0  S       uwait   0xfffffe00998e4a00  syz-executor.0
 3874     1   777     0  S       uwait   0xfffffe0099816c80  syz-executor.0
 3325     1  3325     0  Ss      select  0xfffffe00998e6440  dhclient
 3322     1  3322     0  Ss      select  0xfffffe00998e54c0  dhclient
 3292     1  3292    65  Ss      select  0xfffffe00998e3940  dhclient
 3126     0     0     0  DL      -       0xffffffff83f655c0  [soaiod4]
 3125     0     0     0  DL      -       0xffffffff83f655c0  [soaiod3]
 3124     0     0     0  DL      -       0xffffffff83f655c0  [soaiod2]
 3123     0     0     0  DL      -       0xffffffff83f655c0  [soaiod1]
 2941     1   791     0  SV      uwait   0xfffffe0092339780  syz-executor.3
 2932     1   791     0  SV      uwait   0xfffffe0058af7380  syz-executor.3
 2923     1   791     0  SV      uwait   0xfffffe0058af9b00  syz-executor.3
 2912     1   791     0  SV      uwait   0xfffffe0058a9cd00  syz-executor.3
 2586     1  2586     0  Ss      select  0xfffffe00998e65c0  dhclient
 2583     1  2583     0  Ss      select  0xfffffe009a5bd340  dhclient
 2557     1  2557    65  Ss      select  0xfffffe00998e5a40  dhclient
 1791     1  1791     0  Ss      select  0xfffffe0058af9840  dhclient
 1784     1  1784     0  Ss      select  0xfffffe009a5bb8c0  dhclient
 1744     1  1744    65  Ss      select  0xfffffe009a5bbdc0  dhclient
 1615     1   783     0  S       uwait   0xfffffe0092339100  syz-executor.2
 1611     1   783     0  S       uwait   0xfffffe0099817200  syz-executor.2
 1602     1   783     0  S       uwait   0xfffffe0058af7580  syz-executor.2
 1589     1   783     0  S       uwait   0xfffffe0099817000  syz-executor.2
 1079     0     0     0  DL      aiordy  0xfffffe0099906548  [aiod4]
 1078     0     0     0  DL      aiordy  0xfffffe0092dd8000  [aiod3]
 1077     0     0     0  DL      aiordy  0xfffffe005884e548  [aiod2]
 1076     0     0     0  DL      aiordy  0xfffffe0099906a90  [aiod1]
  825     1   825     0  Ss      select  0xfffffe0058af7140  dhclient
  818     1   818     0  Ss      select  0xfffffe00923393c0  dhclient
  791   774   791     0  Ss      piperd  0xfffffe0058b748b8  syz-executor.3
  783   774   783     0  Ss      piperd  0xfffffe0058b75000  syz-executor.2
  778   774   778     0  Rs                                  syz-executor.1
  777   774   777     0  Rs                                  syz-executor.0
  774   772   772     0  S       (threaded)                  syz-fuzzer
100101                   S       uwait   0xfffffe0053f7d180  syz-fuzzer
100117                   S       uwait   0xfffffe0058af8300  syz-fuzzer
100118                   S       uwait   0xfffffe0058af8400  syz-fuzzer
100119                   S       uwait   0xfffffe0058af8500  syz-fuzzer
100120                   S       uwait   0xfffffe0058af8600  syz-fuzzer
100121                   S       uwait   0xfffffe0058af8700  syz-fuzzer
100122                   S       uwait   0xfffffe0058af8800  syz-fuzzer
100123                   S       kqread  0xfffffe000817e000  syz-fuzzer
100124                   S       uwait   0xfffffe009233a280  syz-fuzzer
  772   770   772     0  Ss      pause   0xfffffe0058c2f0b0  csh
  770   688   770     0  Ss      select  0xfffffe0092339740  sshd
  754     1   754     0  Ss+     ttyin   0xfffffe00574d7cb0  getty
  753     1   753     0  Ss+     ttyin   0xfffffe00574d50b0  getty
  752     1   752     0  Ss+     ttyin   0xfffffe00574d54b0  getty
  751     1   751     0  Ss+     ttyin   0xfffffe00574d58b0  getty
  750     1   750     0  Ss+     ttyin   0xfffffe00586c0cb0  getty
  749     1   749     0  Ss+     ttyin   0xfffffe00574d5cb0  getty
  748     1   748     0  Ss+     ttyin   0xfffffe00574d60b0  getty
  747     1   747     0  Ss+     ttyin   0xfffffe00574d64b0  getty
  746     1   746     0  Ss+     ttyin   0xfffffe00574d68b0  getty
  692     1   692     0  Ss      nanslp  0xffffffff83e458c1  cron
  688     1   688     0  Ss      select  0xfffffe0058af7c40  sshd
  501     1   501     0  Ss      select  0xfffffe009233ac40  syslogd
  430     1   430     0  Ss      select  0xfffffe009233a740  devd
  429     1   429    65  Ss      select  0xfffffe009233a5c0  dhclient
  344     1   344     0  Ss      select  0xfffffe009233a6c0  dhclient
  341     1   341     0  Ss      select  0xfffffe0058af7cc0  dhclient
   17     0     0     0  DL      syncer  0xffffffff83f6b0e0  [syncer]
   16     0     0     0  DL      vlruwt  0xfffffe005884ea90  [vnlru]
   15     0     0     0  DL      (threaded)                  [bufdaemon]
100080                   D       psleep  0xffffffff83f696e0  [bufdaemon]
100083                   D       -       0xffffffff83211f80  [bufspacedaemon-0]
100093                   D       sdflush 0xfffffe0058632ce8  [/ worker]
    9     0     0     0  DL      psleep  0xffffffff83f9d180  [vmdaemon]
    8     0     0     0  DL      (threaded)                  [pagedaemon]
100078                   D       psleep  0xffffffff83f91038  [dom0]
100081                   D       launds  0xffffffff83f91044  [laundry: dom0]
100082                   D       umarcl  0xffffffff81ea4ba0  [uma]
    7     0     0     0  DL      -       0xffffffff83c01688  [rand_harvestq]
    6     0     0     0  DL      pftm    0xffffffff84b1b530  [pf purge]
    5     0     0     0  DL      waiting 0xffffffff847a04e0  [sctp_iterator]
    4     0     0     0  RL      (threaded)                  [cam]
100045                   RunQ                                [doneq0]
100046                   D       -       0xffffffff83aa3540  [async]
100077                   D       -       0xffffffff83aa33c0  [scanner]
   14     0     0     0  DL      seqstat 0xfffffe0056ec5488  [sequencer 00]
    3     0     0     0  DL      (threaded)                  [crypto]
100041                   D       crypto_ 0xffffffff83f8c840  [crypto]
100042                   D       crypto_ 0xfffffe0053ed6c30  [crypto returns 0]
100043                   D       crypto_ 0xfffffe0053ed6c80  [crypto returns 1]
   13     0     0     0  DL      (threaded)                  [geom]
100036                   D       -       0xffffffff83e1ae80  [g_event]
100037                   D       -       0xffffffff83e1aea0  [g_up]
100038                   D       -       0xffffffff83e1aec0  [g_down]
    2     0     0     0  WL      (threaded)                  [clock]
100030                   I                                   [clock (0)]
100031                   I                                   [clock (1)]
   12     0     0     0  RL      (threaded)                  [intr]
100010                   I                                   [swi6: Giant taskq]
100017                   I                                   [swi5: fast taskq]
100020                   I                                   [swi6: task queue]
100029                   Run     CPU 1                       [swi1: netisr 0]
100032                   I                                   [swi3: busdma]
100033                   I                                   [swi1: hpts]
100034                   I                                   [swi1: hpts]
100047                   I                                   [irq24: virtio_pci0]
100048                   I                                   [irq25: virtio_pci0]
100049                   I                                   [irq26: virtio_pci0]
100050                   I                                   [irq27: virtio_pci0]
100051                   I                                   [irq28: virtio_pci1]
100052                   I                                   [irq29: virtio_pci1]
100053                   I                                   [irq30: virtio_pci1]
100054                   I                                   [irq31: virtio_pci1]
100055                   I                                   [irq32: virtio_pci1]
100060                   I                                   [irq33: virtio_pci2]
100061                   I                                   [irq34: virtio_pci2]
100062                   I                                   [irq35: virtio_pci2]
100064                   I                                   [irq1: atkbd0]
100065                   I                                   [irq12: psm0]
100066                   I                                   [swi0: uart uart++]
100070                   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    0xfffffe0053dde000  [init]
   10     0     0     0  DL      audit_w 0xffffffff83f8d340  [audit]
    0     0     0     0  DLs     (threaded)                  [kernel]
100000                   D       swapin  0xffffffff83e1b8c0  [swapper]
100005                   D       -       0xfffffe0053c95b00  [softirq_0]
100006                   D       -       0xfffffe0053c95900  [softirq_1]
100007                   D       -       0xfffffe0053c95700  [if_io_tqg_0]
100008                   D       -       0xfffffe0053c95500  [if_io_tqg_1]
100009                   D       -       0xfffffe0053c95300  [if_config_tqg_0]
100011                   D       -       0xfffffe0008181c00  [aiod_kick taskq]
100012                   D       -       0xfffffe0008181b00  [inm_free taskq]
100013                   D       -       0xfffffe0008181a00  [linuxkpi_irq_wq]
100014                   D       -       0xfffffe0008181900  [in6m_free taskq]
100015                   D       -       0xfffffe0008181800  [deferred_unmount ta]
100016                   D       -       0xfffffe0008181700  [thread taskq]
100018                   D       -       0xfffffe0008181500  [kqueue_ctx taskq]
100019                   D       -       0xfffffe0008181400  [pci_hp taskq]
100021                   D       -       0xfffffe0008181200  [linuxkpi_short_wq_0]
100022                   D       -       0xfffffe0008181200  [linuxkpi_short_wq_1]
100023                   D       -       0xfffffe0008181200  [linuxkpi_short_wq_2]
100024                   D       -       0xfffffe0008181200  [linuxkpi_short_wq_3]
100025                   D       -       0xfffffe0008181100  [linuxkpi_long_wq_0]
100026                   D       -       0xfffffe0008181100  [linuxkpi_long_wq_1]
100027                   D       -       0xfffffe0008181100  [linuxkpi_long_wq_2]
100028                   D       -       0xfffffe0008181100  [linuxkpi_long_wq_3]
100035                   D       -       0xfffffe0053f33300  [firmware taskq]
100039                   D       -       0xfffffe0053f33200  [crypto_0]
100040                   D       -       0xfffffe0053f33200  [crypto_1]
100056                   D       -       0xfffffe0053f32d00  [vtnet0 rxq 0]
100057                   D       -       0xfffffe0053f32c00  [vtnet0 txq 0]
100058                   D       -       0xfffffe0053f32b00  [vtnet0 rxq 1]
100059                   D       -       0xfffffe0053f32a00  [vtnet0 txq 1]
100063                   D       vtbslp  0xfffffe0056fa1480  [virtio_balloon]
100067                   D       -       0xffffffff82bbfb80  [deadlkres]
100071                   D       -       0xfffffe0008182100  [mca taskq]
100073                   D       -       0xfffffe0053f32500  [acpi_task_0]
100074                   D       -       0xfffffe0053f32500  [acpi_task_1]
100075                   D       -       0xfffffe0053f32500  [acpi_task_2]
100076                   D       -       0xfffffe0053f32e00  [CAM taskq]
 3034     1   778     0  Z                                   syz-executor.1
 3039     1   778     0  Z                                   syz-executor.1
 3044     1   778     0  Z                                   syz-executor.1
 3049     1   778     0  Z                                   syz-executor.1
db> show all locks
Process 9313 (syz-executor.1) thread 0xfffffe009ce69ac0 (111483)
exclusive lockmgr bufwait (bufwait) r = 0 (0xfffffe0007b149c0) locked @ /syzkaller/managers/i386/kernel/sys/kern/vfs_bio.c:1725
exclusive lockmgr ufs (ufs) r = 0 (0xfffffe0092a005b0) locked @ /syzkaller/managers/i386/kernel/sys/kern/vfs_vnops.c:1164
Process 9313 (syz-executor.1) thread 0xfffffe0092928020 (111488)
exclusive lockmgr bufwait (bufwait) r = 0 (0xfffffe0007b0e270) locked @ /syzkaller/managers/i386/kernel/sys/kern/vfs_bio.c:1725
exclusive lockmgr ufs (ufs) r = 0 (0xfffffe009cfbee70) locked @ /syzkaller/managers/i386/kernel/sys/kern/vfs_vnops.c:1164
Process 9313 (syz-executor.1) thread 0xfffffe009d1d4740 (111493)
exclusive sleep mutex sctp-tcb (tcb) r = 0 (0xfffffe00993ce1a0) locked @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_output.c:13168
Process 778 (syz-executor.1) thread 0xfffffe008fe28ac0 (100109)
exclusive sleep mutex process lock (process lock) r = 0 (0xfffffe0053f05670) locked @ /syzkaller/managers/i386/kernel/sys/kern/subr_trap.c:118
Process 12 (intr) thread 0xfffffe0053ee0ac0 (100029)
exclusive sleep mutex sctp-inp (inp) r = 0 (0xfffffe0099efc8d8) locked @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_pcb.c:2129
shared rw sctp-info (sctp-info) r = 0 (0xfffffe0053c402f8) locked @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_pcb.c:2125
db> show malloc
              Type        InUse        MemUse     Requests
           pf_hash            5        11524K            5
          tcp_hpts            6         4801K            6
            devbuf         4217         4323K         4245
         sysctloid        35306         2080K        35377
             vtbuf           24         1968K           46
              kobj          327         1308K          488
               pcb          585         1169K        19492
            newblk          182         1070K        29404
          vfscache            3         1025K            3
          filedesc          108          858K        16817
          inodedep          186          582K         9794
         ufs_quota            1          512K            1
          vfs_hash            1          512K            1
           callout            2          512K            2
           subproc          253          509K         9471
              intr            4          472K            4
              vmem            3          274K            6
         sctp_stro          244          272K         4261
         sctp_atcl          532          200K        14288
            acpica         1674          184K        56014
         vnet_data            1          168K            1
           tidhash            3          141K            3
            linker          358          134K          386
           pagedep           20          133K         8547
        tfo_ccache            1          128K            1
            DEVFS1          109          109K          126
               sem            4          106K            4
           filemon           12           96K          130
               BPF           46           88K           71
               bus          991           81K         5140
          mtx_pool            2           72K            2
          syncache            1           68K            1
            module          512           64K          512
          acpitask            1           64K            1
       ddb_capture            1           64K            1
           kdtrace          329           61K        20815
              umtx          484           61K          484
            dirrem          165           42K         9171
              temp           35           35K         8230
         sctp_atky          796           33K        19288
            DEVFS3          128           32K          138
         hostcache            1           32K            1
               shm            1           32K           31
               msg            4           30K            4
        gtaskqueue           18           26K           18
            kbdmux            6           22K            6
          routetbl          145           21K         1403
          freefile          164           21K         9076
            ifaddr           70           20K           72
        DEVFS_RULE           56           20K           56
           lltable           54           18K          375
         ufs_mount            4           17K            5
              proc            3           17K            3
               tty           16           16K           16
           ithread          100           16K          100
         sctp_timw           63           16K           63
            bus-sc           34           15K         1651
            KTRACE          100           13K        13021
             ifnet            7           13K            7
       ether_multi          152           13K          169
              kenv           95           12K           95
      eventhandler          134           12K          134
              rman           88           11K          429
              GEOM           61           11K          490
              ksem           11           11K          235
         CAM queue            5           11K         1528
            kqueue          116           10K         9403
         in6_multi           65            9K           65
         sctp_athm          532            9K        14731
         bmsafemap            2            9K         9690
              UART           12            9K           12
           devstat            4            9K            4
          pf_table            4            8K          248
               rpc            2            8K            2
             shmfd            1            8K           31
       pfs_vncache            1            8K            1
          sctp_map          488            8K         8506
         pfs_nodes           20            8K           20
     audit_evclass          237            8K          296
              cred           29            8K          280
           pwddesc          110            7K         9509
         taskqueue           63            7K           63
            sglist            5            7K            5
           CAM DEV            3            6K          510
            plimit           24            6K          445
            DEVFSP           92            6K         1057
          pf_ifnet           17            6K          308
           session           42            6K          103
       ufs_dirhash           24            5K           24
               UMA          272            5K          272
         proc-args          137            5K        10621
                vt           11            5K           11
           memdesc            1            4K            1
               MCA           32            4K           32
             evdev            4            4K            4
             lockf           34            4K          222
         sctp_stri            7            4K          839
           acpisem           28            4K           28
             selfd           55            4K       130016
             hhook           15            4K           17
          kcovinfo           52            4K           52
          terminal           11            3K           11
           uidinfo            5            3K           22
            select           19            3K          151
        local_apic            1            2K            1
           io_apic            1            2K            1
       fpukern_ctx            2            2K            2
          indirdep            8            2K        11422
         ipsec-saq            2            2K            2
           pf_osfp           18            2K           18
         newdirblk           15            2K         8392
            ip6ndp           12            2K           13
          sctp_ifa           13            2K           14
            Unitno           27            2K          405
           CAM XPT           22            2K          543
            CC Mem           25            2K         3417
               msi           12            2K           12
          in_multi            6            2K           10
       inpcbpolicy           41            2K         4411
          freework            5            2K        17301
       ipsecpolicy            2            2K            2
           acpidev           20            2K           20
             clone            9            2K           16
               tun            7            2K            7
           softdep            1            1K            1
             mkdir            8            1K        16784
          freeblks            4            1K         9440
            sahead            1            1K            1
          secasvar            1            1K            1
             nhops            6            1K            8
       vnodemarker            2            1K          378
      NFSD session            1            1K            1
         cryptodev           14            1K         1305
        CAM periph            4            1K          271
             ipsec            3            1K            3
          sctp_ifn            6            1K           14
            diradd            6            1K         9213
               mld            6            1K            6
              igmp            6            1K            6
         toponodes            6            1K            6
            isadev            6            1K            6
             mount           16            1K          492
               osd           29            1K         3300
          pci_link           10            1K           10
            crypto            4            1K          211
 encap_export_host           12            1K           12
          procdesc            5            1K           14
              pfil            4            1K            4
               iov            4            1K        20615
              cdev            2            1K            2
           pf_rule            3            1K          184
           tcp_fsb            3            1K          829
    chacha20random            1            1K            1
         sctp_aadr            4            1K           70
      NFSD lckfile            1            1K            1
     NFSD V4client            1            1K            1
             DEVFS            9            1K           10
            vnodes            1            1K            9
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            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            5            1K        15462
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            apmdev            1            1K            1
          atkbddev            2            1K            2
     CAM dev queue            2            1K            2
        ip_msource            2            1K            3
 CAM I/O Scheduler            1            1K            1
          CAM path            4            1K         1034
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          filecaps            5            1K           98
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              vnet            1            1K            1
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               pmc            1            1K            1
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           Per-cpu            1            1K            1
          p1003.1b            1            1K            1
            mqdata            0            0K            0
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            ipcomp            0            0K            0
               esp            0            0K            0
                ah            0            0K            0
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        sctp_socko            0            0K         6873
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        MLX5EEPROM            0            0K            0
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            statfs            0            0K         8592
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ag_tgt_map_t malloc            0            0K            0
ag_slr_map_t malloc            0            0K            0
lDevFlags * malloc            0            0K            0
tiDeviceHandle_t * malloc            0            0K            0
ag_portal_data_t malloc            0            0K            0
ag_device_t malloc            0            0K            0
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             sigio            0            0K            2
filedesc_to_leader            0            0K            0
               pwd            0            0K            0
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                ix            0            0K            0
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            aacbuf            0            0K            0
              zstd            0            0K            0
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     tr_raid5_data            0            0K            0
    tr_raid1e_data            0            0K            0
     tr_raid1_data            0            0K            0
     tr_raid0_data            0            0K            0
    tr_concat_data            0            0K            0
       md_sii_data            0            0K            0
   md_promise_data            0            0K            0
    md_nvidia_data            0            0K            0
   md_jmicron_data            0            0K            0
     md_intel_data            0            0K            0
       md_ddf_data            0            0K            0
         raid_data            0            0K           72
     geom_flashmap            0            0K            0
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        tmpfs name            0            0K            0
       tmpfs mount            0            0K            0
           NFS FHA            0            0K            0
         newnfsmnt            0            0K            0
  newnfsclient_req            0            0K            0
   NFSCL layrecall            0            0K            0
db> show uma
              Zone   Size    Used    Free    Requests  Sleeps  Bucket  Total Mem    XFree
   mbuf_jumbo_page   4096    8938     460      998996       0     254   38494208        0
           tcp_log    416       0   20322      979062       0     254    8453952        0
              mbuf    256   10900   10193     4726076       0     254    5399808        0
    ertt_txseginfo     40   47200    2896     2225350       0     254    2003840        0
              pbuf   2624       0     762           0       0       2    1999488        0
        RADIX NODE    144   12696     487      267262       0      63    1898352        0
          BUF TRIE    144     274   11514       19987       0      62    1697472        0
        malloc-128    128   12756     357       21999       0     126    1678464        0
        malloc-384    384    4155      45        4166       0      30    1612800        0
      mbuf_cluster   2048     762       0         762       0     254    1560576        0
       tcp_bbr_map    128    1764    9706      600753       0     126    1468160        0
       malloc-4096   4096     328       4         491       0       2    1359872        0
       UMA Slabs 0    112   11312      22       11312       0     126    1269408        0
         vmem btag     56   22308      51       22308       0     254    1252104        0
         sctp_asoc   2288     244     266        4188       0     254    1166880        0
      malloc-16384  16384      54       6        8571       0       1     983040        0
        256 Bucket   2048     320     112       16576       0       8     884736        0
         VM OBJECT    264    2723      97      150365       0      30     744480        0
         FFS inode   1160     592      38        9672       0       8     730800        0
       malloc-2048   2048     283      21        9700       0       8     622592        0
           sctp_ep   1208     281     229        9674       0     254     616080        0
             tcpcb   1104      25     486        3289       0     254     564144        0
       malloc-4096   4096     115       7        9322       0       2     499712        0
            socket    960     104     404       15602       0     254     487680        0
            THREAD   1808     214      28       11493       0       8     437536        0
         MAP ENTRY     96    3905     253      392372       0     126     399168        0
          lkpicurr    168       2    2350           2       0      62     395136        0
            lkpimm    168       1    2327           1       0      62     391104        0
        sctp_raddr    736     287     230        4862       0     254     380512        0
             VNODE    448     632      88        9714       0      30     322560        0
       malloc-1024   1024     244      44        4280       0      16     294912        0
         malloc-64     64    3903     696      134013       0     254     294336        0
        sctp_chunk    152     327    1467       47441       0     254     272688        0
      malloc-65536  65536       4       0           4       0       1     262144        0
      malloc-32768  32768       1       7       10779       0       1     262144        0
           VMSPACE   2552      85      11        9288       0       4     244992        0
         malloc-16     16   14647     353       18202       0     254     240000        0
        malloc-384    384     555      45       14334       0      30     230400        0
            DEVCTL   1024       0     220         154       0       0     225280        0
     FPU_save_area    832     216      45       18224       0      16     217152        0
        128 Bucket   1024     151      60        6192       0      16     216064        0
      malloc-65536  65536       1       2         106       0       1     196608        0
      malloc-65536  65536       3       0           3       0       1     196608        0
      malloc-65536  65536       1       2         137       0       1     196608        0
       mbuf_packet    256     104     658       46394       0     254     195072        0
        malloc-256    256     204     546       31163       0      62     192000        0
       malloc-8192   8192      18       5         164       0       1     188416        0
         UMA Zones    768     244       0         244       0      16     187392        0
              PROC   1352     113      25        9320       0       8     186576        0
         malloc-32     32    5343     327       10864       0     254     181440        0
        malloc-128    128    1132     263       26547       0     126     178560        0
       FFS2 dinode    256     592      98        9672       0      62     176640        0
        malloc-256    256     165     525       10298       0      62     176640        0
        malloc-256    256     463     227       36701       0      62     176640        0
       malloc-4096   4096      39       3          57       0       2     172032        0
        malloc-384    384     185     235        9928       0      30     161280        0
       S VFS Cache    104    1016     505       10459       0     126     158184        0
       malloc-1024   1024     123      21         141       0      16     147456        0
         filedesc0   1072     110      23        9509       0       8     142576        0
      malloc-65536  65536       0       2         382       0       1     131072        0
      malloc-32768  32768       0       4         124       0       1     131072        0
             unpcb    256      20     490        1467       0     254     130560        0
            clpbuf   2624       0      48         262       0      16     125952        0
          ksiginfo    112     124     920        7015       0     126     116928        0
      malloc-16384  16384       3       4          11       0       1     114688        0
        malloc-256    256     306     129       21153       0      62     111360        0
          UMA Kegs    384     230       3         230       0      30      89472        0
          syncache    168       0     528           8       0     254      88704        0
         64 Bucket    512      94      74       10252       0      30      86016        0
        sctp_readq    152       3     517         466       0     254      79040        0
             g_bio    408       8     172      169322       0      30      73440        0
        malloc-384    384     160      20         164       0      30      69120        0
         malloc-64     64     691     380       19501       0     254      68544        0
         malloc-64     64     539     532        4952       0     254      68544        0
        malloc-128    128     300     227        1188       0     126      67456        0
        malloc-128    128     146     381       34643       0     126      67456        0
      malloc-65536  65536       0       1           8       0       1      65536        0
       malloc-8192   8192       8       0         109       0       1      65536        0
       malloc-2048   2048       8      24         945       0       8      65536        0
       malloc-2048   2048      16      16         310       0       8      65536        0
        malloc-256    256     126     129       19730       0      62      65280        0
         32 Bucket    256     102     153        7342       0      62      65280        0
sctp_stream_msg_out    112      84     456        1189       0     254      60480        0
       malloc-8192   8192       5       2           9       0       1      57344        0
       malloc-8192   8192       5       2           8       0       1      57344        0
         tcp_inpcb    424      25     101        3289       0      30      53424        0
         malloc-64     64     425     394       18360       0     254      52416        0
        malloc-128    128     179     224         880       0     126      51584        0
        malloc-256    256      99      96        1049       0      62      49920        0
           DIRHASH   1024      34      14          34       0      16      49152        0
             NAMEI   1024       0      48       53904       0      16      49152        0
      malloc-16384  16384       2       1          17       0       1      49152        0
       malloc-2048   2048       8      16          29       0       8      49152        0
       malloc-2048   2048       2      22         575       0       8      49152        0
       malloc-1024   1024       6      42        1998       0      16      49152        0
      tcp_rack_pcb    896       3      51         829       0      16      48384        0
            pcpu-8      8    4821     811       11514       0     254      45056        0
       tcp_bbr_pcb    832       7      47        1614       0      16      44928        0
             Files     80     364     186       35192       0     126      44000        0
         TURNSTILE    136     243      72         243       0      62      42840        0
       Mountpoints   2752       2      12           6       0       4      38528        0
             ripcb    424       5      85         219       0      30      38160        0
     udplite_inpcb    424       0      90         123       0      30      38160        0
         udp_inpcb    424      11      79         780       0      30      38160        0
            da_ccb    544       2      68       42442       0      16      38080        0
              pipe    744      24      26         577       0      16      37200        0
         hostcache     64       5     562           5       0     254      36288        0
               PWD     32      67    1067        8441       0     254      36288        0
         malloc-64     64      19     548        1038       0     254      36288        0
         malloc-64     64     285     282       14516       0     254      36288        0
         malloc-64     64       8     559         865       0     254      36288        0
         malloc-64     64     318     249        5680       0     254      36288        0
         malloc-32     32     629     505       14906       0     254      36288        0
         16 Bucket    144      73     179        1969       0      62      36288        0
          8 Bucket     80      64     386        2869       0     126      36000        0
        malloc-128    128      66     213         359       0     126      35712        0
        malloc-128    128     107     172        3912       0     126      35712        0
        malloc-128    128     163     116        1343       0     126      35712        0
     routing nhops    256      27     108          34       0      62      34560        0
           ttyoutq    256      72      63         160       0      62      34560        0
        malloc-384    384      52      38         392       0      30      34560        0
        malloc-384    384      11      79         520       0      30      34560        0
        malloc-256    256      96      39         654       0      62      34560        0
        malloc-256    256       7     128         660       0      62      34560        0
        SLEEPQUEUE     88     243     141         243       0     126      33792        0
      malloc-32768  32768       1       0           1       0       1      32768        0
      malloc-32768  32768       1       0           1       0       1      32768        0
       malloc-4096   4096       5       3         631       0       2      32768        0
       malloc-4096   4096       3       5        8595       0       2      32768        0
       malloc-2048   2048       1      15          13       0       8      32768        0
       malloc-2048   2048       2      14          16       0       8      32768        0
       malloc-2048   2048       1      15         692       0       8      32768        0
       malloc-1024   1024       4      28         155       0      16      32768        0
       malloc-1024   1024       2      30          51       0      16      32768        0
       malloc-1024   1024      16      16          20       0      16      32768        0
       malloc-1024   1024      17      15          38       0      16      32768        0
       malloc-1024   1024       1      31           9       0      16      32768        0
        malloc-512    512       2      62         120       0      30      32768        0
        malloc-512    512      11      53          38       0      30      32768        0
        malloc-512    512       0      64          74       0      30      32768        0
        malloc-512    512       0      64           4       0      30      32768        0
        malloc-512    512       9      55         890       0      30      32768        0
        malloc-512    512       2      62         386       0      30      32768        0
        malloc-512    512       9      55          20       0      30      32768        0
           pcpu-64     64     492      20         492       0     254      32768        0
             KNOTE    160      28     172       94773       0      62      32000        0
            ttyinq    160     135      65         300       0      62      32000        0
         malloc-16     16    1373     627       33477       0     254      32000        0
      tcp_rack_map    120       6     258        2077       0     126      31680        0
            cpuset    104       7     272         746       0     126      29016        0
   sctp_asconf_ack     48       0     588          19       0     254      28224        0
        sctp_laddr     48     108     480        3553       0     254      28224        0
   tcp_inpcb ports     32       5     877        2170       0     254      28224        0
         malloc-32     32     337     545        1020       0     254      28224        0
          4 Bucket     48       6     582         225       0     254      28224        0
          2 Bucket     32      66     816        2769       0     254      28224        0
               AIO    208       0     133         123       0      62      27664        0
       malloc-4096   4096       2       4          46       0       2      24576        0
           rtentry    176      30     108          34       0      62      24288        0
              PGRP     88      42     234         103       0     126      24288        0
          rl_entry     40     115     491         116       0     254      24240        0
            itimer    352       0      66          28       0      30      23232        0
        malloc-384    384      31      29         356       0      30      23040        0
        malloc-384    384       1      59          39       0      30      23040        0
         domainset     40       0     567         564       0     254      22680        0
tfo_ccache_entries     80       3     253           3       0     126      20480        0
             udpcb     32      11     619         903       0     254      20160        0
udplite_inpcb ports     32       0     630           8       0     254      20160        0
   udp_inpcb ports     32       3     627          72       0     254      20160        0
              ertt     72      25     255        3289       0     126      20160        0
         malloc-32     32     129     501        6269       0     254      20160        0
         malloc-32     32      97     533        9157       0     254      20160        0
         malloc-32     32     100     530        4291       0     254      20160        0
         malloc-32     32      43     587        2883       0     254      20160        0
           cryptop    280       0      70          68       0      30      19600        0
             AIOCB    552       0      35         510       0      16      19320        0
       L VFS Cache    320       0      60           7       0      30      19200        0
            AIOLIO    272       0      70         159       0      30      19040        0
 epoch_record pcpu    256       4      60           4       0      62      16384        0
      malloc-16384  16384       1       0           1       0       1      16384        0
      malloc-16384  16384       1       0           1       0       1      16384        0
       malloc-8192   8192       2       0           2       0       1      16384        0
       malloc-4096   4096       0       4          61       0       2      16384        0
           SMR CPU     32       7     504           7       0     254      16352        0
          tcpreass     48       0     336           1       0     254      16128        0
      vtnet_tx_hdr     24       0     668     1197569       0     254      16032        0
      tcp_log_node    120       0     132           2       0     126      15840        0
              kenv    258      15      45        1035       0      30      15480        0
            mqnode    416       3      33           3       0      30      14976        0
              vmem   1856       1       7           1       0       8      14848        0
        SMR SHARED     24       7     504           7       0     254      12264        0
    tcp_log_bucket    176       0      69           2       0      62      12144        0
              AIOP     32       4     374           4       0     254      12096        0
         malloc-32     32       4     374         393       0     254      12096        0
         malloc-16     16      11     739        5596       0     254      12000        0
         malloc-16     16      51     699        9061       0     254      12000        0
         malloc-16     16      58     692         341       0     254      12000        0
         malloc-16     16     199     551        3075       0     254      12000        0
         malloc-16     16       8     742        8033       0     254      12000        0
         malloc-16     16      26     724       25488       0     254      12000        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
           pcpu-16     16      14     498          14       0     254       8192        0
       UMA Slabs 1    176      10      12          10       0      62       3872        0
        KMAP ENTRY     96      12      27          14       0       0       3744        0
               tfo      4       0     493           1       0     254       1972        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     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     56       0       0           0       0     254          0        0
               ipq     56       0       0           0       0     254          0        0
          sackhole     32       0       0           0       0     254          0        0
             tcptw     72       0       0           0       0     254          0        0
       sctp_asconf     40       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
            mqueue    248       0       0           0       0      62          0        0
        TMPFS node    224       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    120       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      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-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-16384  16384       0       0           0       0       1          0        0
       malloc-4096   4096       0       0           0       0       2          0        0
        malloc-512    512       0       0           0       0      30          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 2022/03/29 10:59 freebsd-src ae6aa2d43daa 7c337266 console log report panic: _mtx_lock_sleep: recursed on non-recursive mutex sctp-tcb @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_outp
ci-freebsd-i386 2022/03/29 08:56 freebsd-src ae6aa2d43daa 7c337266 console log report panic: _mtx_lock_sleep: recursed on non-recursive mutex sctp-tcb @ /syzkaller/managers/i386/kernel/sys/netinet/sctp_outp
* Struck through repros no longer work on HEAD.