syzbot


panic: condition !vn_need_pageq_flush(vp) not met at /syzkaller/managers/main/kernel/sys/kern/vfs_subr.c:LINE (vgonel)

Status: fixed on 2020/01/31 18:47
Reported-by: syzbot+5f697ec11f89b60941db@syzkaller.appspotmail.com
Fix commit: 0f4d8b77c02c vfs: revert the overzealous assert added in r357285 to vgone
First crash: 1102d, last: 1102d

Sample crash report:
panic: condition !vn_need_pageq_flush(vp) not met at /syzkaller/managers/main/kernel/sys/kern/vfs_subr.c:3865 (vgonel)
cpuid = 1
time = 1580465494
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe002443b730
vpanic() at vpanic+0x1ce/frame 0xfffffe002443b7a0
panic() at panic+0x43/frame 0xfffffe002443b800
vgonel() at vgonel+0xc05/frame 0xfffffe002443b870
vrecycle() at vrecycle+0x7b/frame 0xfffffe002443b8a0
ufs_inactive() at ufs_inactive+0x421/frame 0xfffffe002443b8f0
VOP_INACTIVE_APV() at VOP_INACTIVE_APV+0x78/frame 0xfffffe002443b920
vinactivef() at vinactivef+0x161/frame 0xfffffe002443b970
vputx() at vputx+0x4e4/frame 0xfffffe002443b9e0
handle_workitem_remove() at handle_workitem_remove+0x6b0/frame 0xfffffe002443ba60
process_worklist_item() at process_worklist_item+0x347/frame 0xfffffe002443bb00
softdep_process_worklist() at softdep_process_worklist+0xe2/frame 0xfffffe002443bb50
softdep_flush() at softdep_flush+0x124/frame 0xfffffe002443bba0
fork_exit() at fork_exit+0xac/frame 0xfffffe002443bbf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe002443bbf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 19 tid 100080 ]
Stopped at      kdb_enter+0x67: movq    $0,0x1466c66(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db> show registers
cs                        0x20
ds                        0x3b  ll+0x1a
es                        0x3b  ll+0x1a
fs                        0x13
gs                        0x1b
ss                        0x28  ll+0x7
rax                       0x12
rcx         0xffffffff810ba340  vprintf+0x140
rdx                        0x1
rbx                          0
rsp         0xfffffe002443b710
rbp         0xfffffe002443b730
rsi                          0
rdi         0xffffffff810ba376  vprintf+0x176
r8                           0
r9                  0xffffffff
r10                      0xb5a  ll+0xb39
r11         0xfffff8003aaec4f0
r12         0xffffffff82068d90  ddb_dbbe
r13                          0
r14         0xffffffff81938da7
r15         0xffffffff81938da7
rip         0xffffffff810af437  kdb_enter+0x67
rflags                    0x82  ll+0x61
kdb_enter+0x67: movq    $0,0x1466c66(%rip)
db> show proc
Process 19 (bufdaemon) at 0xfffff80003b15530:
 state: NORMAL
 uid: 0  gids: 0
 parent: pid 0 at 0xffffffff82609c38
 ABI: null
 reaper: 0xffffffff82609c38 reapsubtree: 19
 sigparent: 20
 vmspace: 0xffffffff8261be10
   (map 0xffffffff8261be10)
   (map.pmap 0xffffffff8261bed0)
   (pmap 0xffffffff8261bf30)
 threads: 3
100065                   D       qsleep  0xffffffff825d4658  [bufdaemon]
100070                   D       -       0xffffffff8200a980  [bufspacedaemon-0]
100080                   Run     CPU 1                       [/ worker]
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
 2105   779   779     0  R       (threaded)                  syz-executor.2
100959                   RunQ                                syz-executor.2
100244                   S       sbwait  0xfffff80003e9a8e4  syz-executor.2
100260                   S       sbwait  0xfffff80003e74c6c  syz-executor.2
101157                   S       sbwait  0xfffff80003ee11d4  syz-executor.2
 2104   768   768     0  R       (threaded)                  syz-executor.0
100101                   Run     CPU 0                       syz-executor.0
100243                   S       sbwait  0xfffff80003ee48e4  syz-executor.0
100269                   S       sbwait  0xfffff80003ee61d4  syz-executor.0
101155                   S       connec  0xfffff80003efd0f0  syz-executor.0
100240                   S       uwait   0xfffff80003e32480  syz-executor.0
100249                   S       uwait   0xfffff80003a5c900  syz-executor.0
 2103   800   800     0  S       (threaded)                  syz-executor.3
100096                   S       nanslp  0xffffffff824feca0  syz-executor.3
100230                   S       uwait   0xfffff80003e32680  syz-executor.3
100238                   S       uwait   0xfffff80003301300  syz-executor.3
100239                   S       sbwait  0xfffff80003ee955c  syz-executor.3
100241                   S       sbwait  0xfffff80003eed1d4  syz-executor.3
100250                   S       sbwait  0xfffff80003e968e4  syz-executor.3
100253                   S       sbwait  0xfffff80003ee6c6c  syz-executor.3
100259                   S       uwait   0xfffff80003301700  syz-executor.3
 2102   769   769     0  R       (threaded)                  syz-executor.1
100116                   RunQ                                syz-executor.1
100212                   S       sbwait  0xfffff80003eee1d4  syz-executor.1
100237                   S       sbwait  0xfffff80003ee555c  syz-executor.1
100248                   S       sbwait  0xfffff80003ee9c6c  syz-executor.1
100235                   S       sbwait  0xfffff80003ee38e4  syz-executor.1
100261                   RunQ                                syz-executor.1
101156                   S       uwait   0xfffff80003a5cf00  syz-executor.1
 1894  1888  1894     0  Ss      select  0xfffff80003ceef40  dhclient
 1891     1  1891     0  Ss      select  0xfffff80003d301c0  dhclient
 1888  1881   422    65  S       select  0xfffff80003d30240  dhclient
 1881   422   422     0  S       wait    0xfffff80016426000  sh
 1870     1  1870    65  Ss      select  0xfffff8003a264dc0  dhclient
 1499     1  1499     0  Ss      select  0xfffff8003a264e40  dhclient
 1496     1  1496     0  Ss      select  0xfffff8003a267cc0  dhclient
 1475     1  1475    65  Ss      select  0xfffff80003d302c0  dhclient
 1150     1  1150     0  Ss      select  0xfffff8003a264f40  dhclient
 1147     1  1147     0  Ss      select  0xfffff80003d30140  dhclient
 1126     1  1126    65  Ss      select  0xfffff8003a266840  dhclient
  804     1   804     0  Ss      select  0xfffff8003a2667c0  dhclient
  800   766   800     0  Rs                                  syz-executor.3
  798     1   798     0  Ss      select  0xfffff8003a267c40  dhclient
  779   766   779     0  Ss      nanslp  0xffffffff824feca0  syz-executor.2
  769   766   769     0  Ss      nanslp  0xffffffff824feca0  syz-executor.1
  768   766   768     0  Ss      nanslp  0xffffffff824feca0  syz-executor.0
  766   764   764     0  S       (threaded)                  syz-fuzzer
100097                   S       uwait   0xfffff80003a5d180  syz-fuzzer
100105                   S       uwait   0xfffff80003e32e00  syz-fuzzer
100106                   S       uwait   0xfffff80003e32f00  syz-fuzzer
100107                   S       uwait   0xfffff80003e31280  syz-fuzzer
100108                   S       uwait   0xfffff80003a59b00  syz-fuzzer
100109                   S       uwait   0xfffff80003a59c00  syz-fuzzer
100110                   S       uwait   0xfffff80003e32280  syz-fuzzer
100111                   S       uwait   0xfffff80003a59e00  syz-fuzzer
100112                   S       kqread  0xfffff80003340a00  syz-fuzzer
100113                   S       uwait   0xfffff80003e32380  syz-fuzzer
  764   762   764     0  Ss      pause   0xfffff8003a5370a8  csh
  762   680   762     0  Ss      select  0xfffff8003a267b40  sshd
  746     1   746     0  Ss+     ttyin   0xfffff800033f8cb0  getty
  745     1   745     0  Ss+     ttyin   0xfffff800033fbcb0  getty
  744     1   744     0  Ss+     ttyin   0xfffff80003acc0b0  getty
  743     1   743     0  Ss+     ttyin   0xfffff80003acc4b0  getty
  742     1   742     0  Ss+     ttyin   0xfffff80003acc8b0  getty
  741     1   741     0  Ss+     ttyin   0xfffff80003acccb0  getty
  740     1   740     0  Ss+     ttyin   0xfffff80003acf0b0  getty
  739     1   739     0  Ss+     ttyin   0xfffff80003acf4b0  getty
  738     1   738     0  Ss+     ttyin   0xfffff80003acf8b0  getty
  684     1   684     0  Ss      nanslp  0xffffffff824feca0  cron
  680     1   680     0  Ss      select  0xfffff8003a267e40  sshd
  493     1   493     0  Ss      select  0xfffff8003a267ec0  syslogd
  422     1   422     0  Ss      wait    0xfffff80003e59530  devd
  421     1   421    65  Ss      select  0xfffff80003d2f7c0  dhclient
  336     1   336     0  Ss      select  0xfffff80003d2f940  dhclient
  333     1   333     0  Ss      select  0xfffff80003d2f8c0  dhclient
   21     0     0     0  DL      vlruwt  0xfffff80003b0ea60  [vnlru]
   20     0     0     0  DL      syncer  0xffffffff825d5158  [syncer]
   19     0     0     0  RL      (threaded)                  [bufdaemon]
100065                   D       qsleep  0xffffffff825d4658  [bufdaemon]
100070                   D       -       0xffffffff8200a980  [bufspacedaemon-0]
100080                   Run     CPU 1                       [/ worker]
   18     0     0     0  DL      psleep  0xffffffff825f00c8  [vmdaemon]
   17     0     0     0  DL      (threaded)                  [pagedaemon]
100063                   D       psleep  0xffffffff8261cfd8  [dom0]
100068                   D       launds  0xffffffff8261cfe4  [laundry: dom0]
100069                   D       umarcl  0xffffffff8153f130  [uma]
   16     0     0     0  DL      -       0xffffffff82359530  [rand_harvestq]
   15     0     0     0  DL      waiting 0xffffffff826625a0  [sctp_iterator]
    9     0     0     0  DL      -       0xffffffff825d405c  [soaiod4]
    8     0     0     0  DL      -       0xffffffff825d405c  [soaiod3]
    7     0     0     0  DL      -       0xffffffff825d405c  [soaiod2]
    6     0     0     0  DL      -       0xffffffff825d405c  [soaiod1]
    5     0     0     0  DL      (threaded)                  [cam]
100031                   D       -       0xffffffff82234940  [doneq0]
100062                   D       -       0xffffffff82234808  [scanner]
    4     0     0     0  DL      crypto_ 0xfffff800031f8e90  [crypto returns 1]
    3     0     0     0  DL      crypto_ 0xfffff800031f8e30  [crypto returns 0]
    2     0     0     0  DL      crypto_ 0xffffffff825ea138  [crypto]
   14     0     0     0  DL      seqstat 0xfffff8000336a888  [sequencer 00]
   13     0     0     0  DL      (threaded)                  [geom]
100022                   D       -       0xffffffff8261b608  [g_event]
100023                   D       -       0xffffffff8261b618  [g_up]
100024                   D       -       0xffffffff8261b610  [g_down]
   12     0     0     0  WL      (threaded)                  [intr]
100006                   I                                   [swi5: fast taskq]
100010                   I                                   [swi6: task queue]
100011                   I                                   [swi6: Giant taskq]
100017                   I                                   [swi3: vm]
100018                   I                                   [swi4: clock (0)]
100019                   I                                   [swi4: clock (1)]
100020                   I                                   [swi1: netisr 0]
100032                   I                                   [irq24: virtio_pci0]
100033                   I                                   [irq25: virtio_pci0]
100034                   I                                   [irq26: virtio_pci0]
100035                   I                                   [irq27: virtio_pci0]
100036                   I                                   [irq28: virtio_pci1]
100037                   I                                   [irq29: virtio_pci1]
100038                   I                                   [irq30: virtio_pci1]
100039                   I                                   [irq31: virtio_pci1]
100040                   I                                   [irq32: virtio_pci1]
100045                   I                                   [irq10: virtio_pci2]
100047                   I                                   [irq1: atkbd0]
100048                   I                                   [irq12: psm0]
100049                   I                                   [swi0: uart uart++]
   11     0     0     0  RL      (threaded)                  [idle]
100003                   CanRun                              [idle: cpu0]
100004                   CanRun                              [idle: cpu1]
    1     0     1     0  SLs     wait    0xfffff800032fb530  [init]
   10     0     0     0  DL      audit_w 0xffffffff82663230  [audit]
    0     0     0     0  DLs     (threaded)                  [kernel]
100000                   D       swapin  0xffffffff82609c38  [swapper]
100005                   D       -       0xfffff80003342000  [thread taskq]
100007                   D       -       0xfffff80003341d00  [kqueue_ctx taskq]
100008                   D       -       0xfffff80003341c00  [config_0]
100009                   D       -       0xfffff80003341b00  [aiod_kick taskq]
100012                   D       -       0xfffff80003341800  [if_config_tqg_0]
100013                   D       -       0xfffff80003341700  [if_io_tqg_0]
100014                   D       -       0xfffff80003341600  [if_io_tqg_1]
100015                   D       -       0xfffff80003341500  [softirq_0]
100016                   D       -       0xfffff80003341400  [softirq_1]
100021                   D       -       0xfffff80003341300  [firmware taskq]
100026                   D       -       0xfffff80003341200  [crypto_0]
100027                   D       -       0xfffff80003341200  [crypto_1]
100041                   D       -       0xfffff80003341000  [vtnet0 rxq 0]
100042                   D       -       0xfffff80003340e00  [vtnet0 txq 0]
100043                   D       -       0xfffff80003340d00  [vtnet0 rxq 1]
100044                   D       -       0xfffff80003340c00  [vtnet0 txq 1]
100046                   D       vtbslp  0xfffff800034d8400  [virtio_balloon]
100050                   D       -       0xfffff80003340b00  [mca taskq]
100053                   D       -       0xffffffff81cdcda0  [deadlkres]
100057                   D       -       0xfffff80003b47100  [acpi_task_0]
100058                   D       -       0xfffff80003b47100  [acpi_task_1]
100059                   D       -       0xfffff80003b47100  [acpi_task_2]
100061                   D       -       0xfffff80003341100  [CAM taskq]
db> show all locks
Process 2102 (syz-executor.1) thread 0xfffff8001618d6e0 (100237)
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xfffff80003ee5500) locked @ /syzkaller/managers/main/kernel/sys/kern/uipc_sockbuf.c:393
Process 19 (bufdaemon) thread 0xfffff80003e33000 (100080)
exclusive lockmgr ufs (ufs) r = 0 (0xfffff800164b0438) locked @ /syzkaller/managers/main/kernel/sys/kern/vfs_subr.c:2906
db> show malloc
              Type        InUse        MemUse     Requests
            devbuf         4213         4851K         4241
             vtbuf           24         1968K           46
         sysctloid        26737         1565K        26801
              kobj          332         1328K          488
          vfscache            4         1025K            4
            newblk            3         1025K         3556
               pcb           33          544K         2759
          inodedep            9          516K         2239
         ufs_quota            1          512K            1
          vfs_hash            1          512K            1
           callout            2          512K            2
              intr            4          388K            4
           subproc          135          285K         2179
            acpica         1674          185K        49750
         vnet_data            1          168K            1
          filedesc           21          149K         2467
           pagedep            7          130K         1392
        tfo_ccache            1          128K            1
               sem            4          106K            4
            DEVFS1          105          105K          122
            linker          222           89K          253
               BPF           46           88K           46
               bus          964           78K         3332
          mtx_pool            2           72K            2
          syncache            1           68K            1
          acpitask            1           64K            1
       ddb_capture            1           64K            1
            module          494           62K          494
              umtx          320           40K          320
           kdtrace          204           40K         9619
        gtaskqueue           22           34K           22
         hostcache            1           32K            1
               shm            1           32K            7
            DEVFS3          124           31K          134
               msg            4           30K            4
        DEVFS_RULE           56           27K           56
            ifaddr           74           25K           76
            kbdmux            6           22K            6
              vmem            3           19K            4
              temp           34           17K         2490
         ufs_mount            3           17K            4
              proc            3           17K            3
           lltable           44           16K           79
               tty           16           16K           16
           tidhash            1           16K            1
           ithread           89           15K           89
       ether_multi          172           14K          177
            bus-sc           30           14K         1394
            KTRACE          100           13K          100
             ifnet            7           13K            7
              kenv           95           12K           99
      eventhandler          123           11K          123
         in6_multi           89           11K           89
         pfs_nodes           20           10K           20
              cred           39           10K          322
              GEOM           60           10K          487
              rman           82           10K          423
         bmsafemap            2            9K         1749
           devstat            4            9K            4
              UART           12            9K           12
               rpc            2            8K            2
             shmfd            1            8K            1
       pfs_vncache            1            8K            1
          routetbl           58            8K           62
         sctp_timw           30            8K           30
     audit_evclass          231            8K          289
            plimit           25            7K          734
            kqueue           64            7K         2110
           CAM DEV            3            6K          510
                vt           11            6K           11
            select           41            6K           41
            sglist            5            6K            5
         CAM queue            5            6K         1528
            DEVFSP           78            5K           82
       ufs_dirhash           24            5K           24
         taskqueue           42            5K           42
           session           34            5K           46
              pgrp           34            5K           46
           memdesc            1            4K            1
               MCA           32            4K           32
             evdev            4            4K            4
          kcovinfo           64            4K           68
               UMA          236            4K          236
             lockf           33            4K           58
             hhook           13            4K           13
         proc-args           53            3K          627
           acpisem           22            3K           22
          terminal           11            3K           11
           uidinfo            5            3K            6
          sctp_ifa           17            3K           17
        local_apic            1            2K            1
           io_apic            1            2K            1
         ipsec-saq            2            2K            2
         sctp_atcl            4            2K         1197
            ip6ndp           12            2K           21
           CAM XPT           22            2K          543
            Unitno           27            2K         8653
          in_multi            6            2K            7
       inpcbpolicy           41            2K         8774
           acpidev           20            2K           20
            crypto            2            2K            2
               msi            9            2K            9
               tun            7            2K            7
       ipsecpolicy            1            1K            1
            sahead            1            1K            1
          secasvar            1            1K            1
         sctp_stro            1            1K           71
             clone            8            1K            8
       vnodemarker            2            1K         1276
      NFSD session            1            1K            1
        CAM periph            4            1K          271
               mld            6            1K            6
          sctp_ifn            6            1K            6
              igmp            6            1K            6
         toponodes            6            1K            6
            isadev            6            1K            6
             mount           16            1K           86
          pci_link           10            1K           10
           CAM SIM            2            1K            2
           softdep            1            1K            1
            diradd            4            1K         1286
              pfil            4            1K            4
    chacha20random            1            1K            1
             epoch            4            1K            4
              cdev            2            1K            2
 encap_export_host            8            1K            8
               iov            2            1K        17652
               osd            3            1K            9
             mkdir            2            1K         2438
            vnodes            1            1K            1
      NFSD lckfile            1            1K            1
     NFSD V4client            1            1K            1
             DEVFS            9            1K           10
            feeder            7            1K            7
         sctp_atky            5            1K         1276
        loginclass            3            1K            3
          CAM path            4            1K         1034
            apmdev            1            1K            1
          atkbddev            2            1K            2
         newdirblk            2            1K         1219
            dirrem            1            1K         1246
          freefile            1            1K         1243
            soname            5            1K         6390
          pmchooks            1            1K            1
            prison            4            1K            4
     CAM dev queue            2            1K            2
 CAM I/O Scheduler            1            1K            1
          nexusdev            5            1K            5
          filecaps            5            1K           97
           entropy            2            1K           41
           tcpfunc            1            1K            1
          sctp_vrf            1            1K            1
         sctp_athm            4            1K         1200
              vnet            1            1K            1
          acpiintr            1            1K            1
               pmc            1            1K            1
              cpus            2            1K            2
          freework            1            1K         1327
          sctp_map            2            1K          142
    vnet_data_free            1            1K            1
           Per-cpu            1            1K            1
          p1003.1b            1            1K            1
           CAM CCB            0            0K        56045
        madt_table            0            0K            2
               PUC            0            0K            0
          ppbusdev            0            0K            0
agtiapi_MemAlloc malloc            0            0K            0
    osti_cacheable            0            0K            0
          tempbuff            0            0K            0
          tempbuff            0            0K            0
            pvscsi            0            0K            0
          smartpqi            0            0K            0
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
     STLock malloc            0            0K            0
          CCB List            0            0K            0
              iavf            0            0K            0
               ixl            0            0K            0
            sr_iov            0            0K            0
               OCS            0            0K            0
               OCS            0            0K            0
              nvme            0            0K            0
               nvd            0            0K            0
            netmap            0            0K            0
            mwldev            0            0K            0
        MVS driver            0            0K            0
       fpukern_ctx            0            0K            0
          xen_intr            0            0K            0
     CAM ccb queue            0            0K            0
           xen_hvm            0            0K            0
         legacydrv            0            0K            0
            qpidrv            0            0K            0
          mrsasbuf            0            0K            0
          mpt_user            0            0K            0
      dmar_idpgtbl            0            0K            0
          dmar_dom            0            0K            0
          dmar_ctx            0            0K            0
       dmar_dmamap            0            0K            0
          mps_user            0            0K            0
            MPSSAS            0            0K            0
              isci            0            0K            0
           bxe_ilt            0            0K            0
            xenbus            0            0K            0
     vm_fictitious            0            0K            0
               mps            0            0K            0
          mpr_user            0            0K            0
            MPRSAS            0            0K            0
           UMAHash            0            0K            0
         vm_pgdata            0            0K            0
           jblocks            0            0K            0
          savedino            0            0K         1226
          sentinel            0            0K            0
            jfsync            0            0K            0
            jtrunc            0            0K            0
             sbdep            0            0K          640
           jsegdep            0            0K            0
              jseg            0            0K            0
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db> show ktr
No such command; use "help" to list available commands

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-freebsd-main 2020/01/31 10:11 freebsd faef5808ac24 5ed23f9a console log report
* Struck through repros no longer work on HEAD.