syzbot


Fatal trap 9: general protection fault in ck_epoch_poll_deferred

Status: auto-closed as invalid on 2020/03/15 01:19
Reported-by: syzbot+f7be64ddae85fa4ce0f6@syzkaller.appspotmail.com
First crash: 1802d, last: 1802d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
freebsd Fatal trap 9: general protection fault in ck_epoch_poll_deferred (2) 4 1471d 1648d 0/2 auto-closed as invalid on 2021/02/09 09:15

Sample crash report:
Fatal trap 9: general protection fault while in kernel mode
cpuid = 1; apic id = 01
instruction pointer	= 0x20:0xffffffff803edb10
stack pointer	        = 0x28:0xfffffe001a145a30
frame pointer	        = 0x28:0xfffffe001a145a80
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 0 (softirq_1)
trap number		= 9
panic: general protection fault
cpuid = 1
time = 1576459072
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001a1456d0
vpanic() at vpanic+0x1c7/frame 0xfffffe001a145740
panic() at panic+0x43/frame 0xfffffe001a1457a0
trap_fatal() at trap_fatal+0x4cc/frame 0xfffffe001a145820
trap() at trap+0xe1/frame 0xfffffe001a145960
calltrap() at calltrap+0x8/frame 0xfffffe001a145960
--- trap 0x9, rip = 0xffffffff803edb10, rsp = 0xfffffe001a145a30, rbp = 0xfffffe001a145a80 ---
ck_epoch_poll_deferred() at ck_epoch_poll_deferred+0x270/frame 0xfffffe001a145a80
epoch_call_task() at epoch_call_task+0x131/frame 0xfffffe001a145b00
gtaskqueue_run_locked() at gtaskqueue_run_locked+0x160/frame 0xfffffe001a145b60
gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0xd8/frame 0xfffffe001a145ba0
fork_exit() at fork_exit+0xac/frame 0xfffffe001a145bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe001a145bf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 0 tid 100014 ]
Stopped at      kdb_enter+0x67: movq    $0,0x145f116(%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         0xffffffff810c19b9  vprintf+0xa9
rdx                          0
rbx                          0
rsp         0xfffffe001a1456b0
rbp         0xfffffe001a1456d0
rsi                          0
rdi         0xffffffff810c19f1  vprintf+0xe1
r8                           0
r9                  0xffffffff
r10                      0x1c6  ll+0x1a5
r11                          0
r12         0xffffffff82068d70  ddb_dbbe
r13                          0
r14         0xffffffff81936155
r15         0xffffffff81936155
rip         0xffffffff810b6c77  kdb_enter+0x67
rflags                    0x82  ll+0x61
kdb_enter+0x67: movq    $0,0x145f116(%rip)
db> show proc
Process 0 (kernel) at 0xffffffff82609878:
 state: NORMAL
 uid: 0  gids: 0
 ABI: null
 reaper: 0xffffffff82609878 reapsubtree: 0
 sigparent: 0
 vmspace: 0xffffffff8261ba90
   (map 0xffffffff8261ba90)
   (map.pmap 0xffffffff8261bb50)
   (pmap 0xffffffff8261bbb0)
 threads: 24
100000                   D       swapin  0xffffffff82609878  [swapper]
100005                   D       -       0xfffff800031cad00  [thread taskq]
100007                   D       in_mult 0xffffffff82661ff0  [config_0]
100008                   D       -       0xfffff800031caa00  [kqueue_ctx taskq]
100009                   D       -       0xfffff800031ca900  [aiod_kick taskq]
100012                   D       -       0xfffff800031ca600  [if_config_tqg_0]
100013                   D       -       0xfffff800031ca500  [softirq_0]
100014                   Run     CPU 1                       [softirq_1]
100015                   D       -       0xfffff800031ca300  [if_io_tqg_0]
100016                   D       -       0xfffff800031ca200  [if_io_tqg_1]
100021                   D       -       0xfffff800031ca000  [firmware taskq]
100026                   D       -       0xfffff800031c9d00  [crypto_0]
100027                   D       -       0xfffff800031c9d00  [crypto_1]
100041                   D       -       0xfffff800031c7100  [vtnet0 rxq 0]
100042                   D       -       0xfffff800031c7000  [vtnet0 txq 0]
100043                   D       -       0xfffff8000377d100  [vtnet0 rxq 1]
100044                   D       -       0xfffff8000377d000  [vtnet0 txq 1]
100046                   D       vtbslp  0xfffff8000354d800  [virtio_balloon]
100050                   D       -       0xfffff8000377a300  [mca taskq]
100053                   D       -       0xffffffff824fd710  [deadlkres]
100058                   D       -       0xfffff80003aa0200  [acpi_task_0]
100059                   D       -       0xfffff80003aa0200  [acpi_task_1]
100060                   D       -       0xfffff80003aa0200  [acpi_task_2]
100061                   D       -       0xfffff800031c9a00  [CAM taskq]
db> ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
 5057   796   796     0  R       (threaded)                  syz-executor.2
100496                   RunQ                                syz-executor.2
101078                   S       uwait   0xfffff8003d162600  syz-executor.2
100120                   RunQ                                syz-executor.2
101063                   S       uwait   0xfffff800039cda00  syz-executor.2
 5056   808   808     0  R       (threaded)                  syz-executor.1
100622                   RunQ                                syz-executor.1
101072                   S       sbwait  0xfffff80003e4355c  syz-executor.1
101088                   S       sbwait  0xfffff80003dd48e4  syz-executor.1
 5055   784   784     0  R       (threaded)                  syz-executor.0
100083                   RunQ                                syz-executor.0
101076                   S       sbwait  0xfffff80003e388e4  syz-executor.0
101086                   S       sbwait  0xfffff80003ddf8e4  syz-executor.0
101087                   S       uwait   0xfffff800039cea80  syz-executor.0
 3356     1  3356    65  Rs                                  dhclient
 2699     1  2699     0  Ss      select  0xfffff800039ea840  dhclient
 2695     1  2695     0  Ss      select  0xfffff80003548b40  dhclient
 2673     1  2673    65  Ss      select  0xfffff80003532b40  dhclient
 2056     1  2056     0  Ss      select  0xfffff800039ebcc0  dhclient
 2053     1  2053     0  Ss      select  0xfffff800039ea7c0  dhclient
 2033     1  2033    65  Rs                                  dhclient
 1378     1  1378     0  Ss      select  0xfffff800039ea4c0  dhclient
 1375     1  1375     0  Ss      select  0xfffff8000352ae40  dhclient
  808   766   808     0  Rs                                  syz-executor.1
  796   766   796     0  Rs                                  syz-executor.2
  784   766   784     0  Rs                                  syz-executor.0
  775   766   775     0  REs                                 syz-executor.3
  766   764   764     0  RE      CPU 0                       syz-fuzzer
  764   762   764     0  SWs     pause   0xfffff800124f1b08  csh
  762   680   762     0  Ss      select  0xfffff800039ea740  sshd
  746     1   746     0  Rs+                                 getty
  745     1   745     0  Ss+     ttyin   0xfffff80003aa48b0  getty
  744     1   744     0  Ss+     ttyin   0xfffff80003aa4cb0  getty
  743     1   743     0  Ss+     ttyin   0xfffff80003aa70b0  getty
  742     1   742     0  Ss+     ttyin   0xfffff80003aa74b0  getty
  741     1   741     0  Ss+     ttyin   0xfffff80003aa78b0  getty
  740     1   740     0  Ss+     ttyin   0xfffff80003aa7cb0  getty
  739     1   739     0  Ss+     ttyin   0xfffff80003aa60b0  getty
  738     1   738     0  Ss+     ttyin   0xfffff80003aa64b0  getty
  684     1   684     0  SWs     nanslp  0xffffffff824fe990  cron
  680     1   680     0  Ss      select  0xfffff800039ea640  sshd
  493     1   493     0  Ss      select  0xfffff80003531440  syslogd
  422     1   422     0  Ss      select  0xfffff800035314c0  devd
  421     1   421    65  Ss      select  0xfffff80003531540  dhclient
  336     1   336     0  Ss      select  0xfffff800039ea6c0  dhclient
  333     1   333     0  Ss      select  0xfffff80003531640  dhclient
   21     0     0     0  DL      syncer  0xffffffff825d4e60  [syncer]
   20     0     0     0  DL      vlruwt  0xfffff80003a6c000  [vnlru]
   19     0     0     0  DL      (threaded)                  [bufdaemon]
100065                   D       qsleep  0xffffffff825d4318  [bufdaemon]
100066                   D       -       0xffffffff8200a980  [bufspacedaemon-0]
100079                   D       sdflush 0xfffff800037626e8  [/ worker]
   18     0     0     0  DL      psleep  0xffffffff825efd08  [vmdaemon]
   17     0     0     0  LL      (threaded)                  [pagedaemon]
100063                   L      *vm obje 0xfffff800039ca840  [dom0]
100069                   L      *pmap    0xfffff80003c51a80  [laundry: dom0]
100070                   D       umarcls 0xffffffff824fd711  [uma]
   16     0     0     0  DL      -       0xffffffff82359518  [rand_harvestq]
   15     0     0     0  DL      waiting 0xffffffff82662220  [sctp_iterator]
    9     0     0     0  DL      -       0xffffffff825d3d1c  [soaiod4]
    8     0     0     0  DL      -       0xffffffff825d3d1c  [soaiod3]
    7     0     0     0  RL                                  [soaiod2]
    6     0     0     0  DL      -       0xffffffff825d3d1c  [soaiod1]
    5     0     0     0  DL      (threaded)                  [cam]
100031                   D       -       0xffffffff822348c0  [doneq0]
100062                   D       -       0xffffffff82234788  [scanner]
    4     0     0     0  DL      crypto_ 0xfffff800033b4090  [crypto returns 1]
    3     0     0     0  DL      crypto_ 0xfffff800033b4030  [crypto returns 0]
    2     0     0     0  DL      crypto_ 0xffffffff825e9de8  [crypto]
   14     0     0     0  DL      seqstat 0xfffff80003323c88  [sequencer 00]
   13     0     0     0  DL      (threaded)                  [geom]
100022                   D       -       0xffffffff8261b288  [g_event]
100023                   D       -       0xffffffff8261b298  [g_up]
100024                   D       -       0xffffffff8261b290  [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                                   [swi4: clock (0)]
100018                   I                                   [swi4: clock (1)]
100019                   I                                   [swi3: vm]
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    0xfffff800032b7530  [init]
   10     0     0     0  DL      audit_w 0xffffffff82662eb0  [audit]
    0     0     0     0  RLs     (threaded)                  [kernel]
100000                   D       swapin  0xffffffff82609878  [swapper]
100005                   D       -       0xfffff800031cad00  [thread taskq]
100007                   D       in_mult 0xffffffff82661ff0  [config_0]
100008                   D       -       0xfffff800031caa00  [kqueue_ctx taskq]
100009                   D       -       0xfffff800031ca900  [aiod_kick taskq]
100012                   D       -       0xfffff800031ca600  [if_config_tqg_0]
100013                   D       -       0xfffff800031ca500  [softirq_0]
100014                   Run     CPU 1                       [softirq_1]
100015                   D       -       0xfffff800031ca300  [if_io_tqg_0]
100016                   D       -       0xfffff800031ca200  [if_io_tqg_1]
100021                   D       -       0xfffff800031ca000  [firmware taskq]
100026                   D       -       0xfffff800031c9d00  [crypto_0]
100027                   D       -       0xfffff800031c9d00  [crypto_1]
100041                   D       -       0xfffff800031c7100  [vtnet0 rxq 0]
100042                   D       -       0xfffff800031c7000  [vtnet0 txq 0]
100043                   D       -       0xfffff8000377d100  [vtnet0 rxq 1]
100044                   D       -       0xfffff8000377d000  [vtnet0 txq 1]
100046                   D       vtbslp  0xfffff8000354d800  [virtio_balloon]
100050                   D       -       0xfffff8000377a300  [mca taskq]
100053                   D       -       0xffffffff824fd710  [deadlkres]
100058                   D       -       0xfffff80003aa0200  [acpi_task_0]
100059                   D       -       0xfffff80003aa0200  [acpi_task_1]
100060                   D       -       0xfffff80003aa0200  [acpi_task_2]
100061                   D       -       0xfffff800031c9a00  [CAM taskq]
db> show all locks
Process 5055 (syz-executor.0) thread 0xfffff80003adb000 (100083)
exclusive sleep mutex umtxql (umtxql) r = 0 (0xffffffff8250c1c0) locked @ /syzkaller/managers/main/kernel/sys/kern/kern_umtx.c:507
Process 775 (syz-executor.3) thread 0xfffff8001240d6e0 (100087)
exclusive sleep mutex if_addr_lock (if_addr_lock) r = 0 (0xfffff80003a171a8) locked @ /syzkaller/managers/main/kernel/sys/netinet/in_mcast.c:1350
exclusive sleep mutex in_multi_list_mtx (in_multi_list_mtx) r = 0 (0xffffffff82661df8) locked @ /syzkaller/managers/main/kernel/sys/netinet/in_mcast.c:1343
exclusive sx in_multi_sx (in_multi_sx) r = 0 (0xffffffff82661ff0) locked @ /syzkaller/managers/main/kernel/sys/netinet/in_mcast.c:1290
exclusive sx in_control (in_control) r = 0 (0xffffffff825d6e18) locked @ /syzkaller/managers/main/kernel/sys/netinet/in.c:243
Process 766 (syz-fuzzer) thread 0xfffff80012668000 (100099)
exclusive rw pmap pv list (pmap pv list) r = 0 (0xfffffe0003605d80) locked @ /syzkaller/managers/main/kernel/sys/amd64/amd64/pmap.c:7289
exclusive sleep mutex pmap (pmap) r = 0 (0xfffff80003d80120) locked @ /syzkaller/managers/main/kernel/sys/amd64/amd64/pmap.c:7209
Process 17 (pagedaemon) thread 0xfffff80003c4e000 (100069)
exclusive rw vm object (vm object) r = 0 (0xfffff8001c4a0d68) locked @ /syzkaller/managers/main/kernel/sys/vm/vm_pageout.c:795
exclusive sleep mutex vm page (vm page) r = 0 (0xffffffff82047b00) locked @ /syzkaller/managers/main/kernel/sys/vm/vm_page.c:1196
db> show malloc
              Type        InUse        MemUse     Requests
            devbuf         4214         4851K         4242
             vtbuf           24         1968K           46
           callout            3         1672K            3
              kobj          333         1332K          489
         sysctloid        22990         1328K        23054
            newblk            9         1026K         5923
          vfscache            4         1025K            4
          inodedep           89          556K         4368
               pcb           24          537K          907
         ufs_quota            1          512K            1
          vfs_hash            1          512K            1
              intr            4          388K            4
           subproc          139          269K         5143
            acpica         1674          185K        50040
         vnet_data            1          168K            1
          filedesc           19          133K         8360
           pagedep           10          131K         4198
        tfo_ccache            1          128K            1
               sem            4          106K            4
            DEVFS1          105          105K          122
            linker          221           89K          252
               bus          966           78K         3325
          mtx_pool            2           72K            2
               BPF           38           71K           46
          syncache            1           68K            1
          acpitask            1           64K            1
       ddb_capture            1           64K            1
            module          495           62K          495
              umtx          332           42K          332
        gtaskqueue           22           34K           22
           kdtrace          172           33K        22534
         hostcache            1           32K            1
               shm            1           32K            6
            DEVFS3          124           31K          134
               msg            4           30K            4
        DEVFS_RULE           56           27K           56
            ifaddr           75           26K           76
            kbdmux            6           22K            6
              vmem            3           19K            4
              temp           34           17K         4246
         ufs_mount            3           17K            4
              proc            3           17K            3
               tty           16           16K           16
           tidhash            1           16K            1
           lltable           41           15K           51
           ithread           89           15K           89
       ether_multi          164           14K          177
            KTRACE          100           13K          100
             ifnet            7           13K            7
              cred           47           12K          283
              kenv           95           12K           99
      eventhandler          122           11K          122
         pfs_nodes           20           10K           20
            dirrem           78           10K         4284
          freefile           78           10K         4273
              GEOM           60           10K          487
              rman           82           10K          423
         in6_multi           77           10K           89
         bmsafemap            2            9K         4364
            select           66            9K           66
           devstat            4            9K            4
              UART           12            9K           12
               rpc            2            8K            2
         sctp_timw           32            8K           32
             shmfd            1            8K            1
       pfs_vncache            1            8K            1
     audit_evclass          231            8K          289
          routetbl           51            7K           63
           CAM DEV            3            6K          508
            plimit           23            6K          441
                vt           11            6K           11
            sglist            5            6K            5
         CAM queue            5            6K         1522
         taskqueue           42            5K           42
            DEVFSP           67            5K           82
           memdesc            1            4K            1
               MCA           32            4K           32
       ufs_dirhash            8            4K           24
           session           32            4K           48
              pgrp           32            4K           48
             evdev            4            4K            4
               UMA          233            4K          233
            kqueue           57            4K         5065
          kcovinfo           55            4K           68
             lockf           30            4K           69
             hhook           13            4K           13
           acpisem           22            3K           22
          terminal           11            3K           11
         proc-args           49            3K          636
           uidinfo            5            3K            7
        local_apic            1            2K            1
           io_apic            1            2K            1
         ipsec-saq            2            2K            2
            ip6ndp           12            2K           21
          sctp_ifa           14            2K           17
            Unitno           31            2K        22707
           CAM XPT           22            2K          541
          in_multi            6            2K            7
          freework            6            2K         4674
           acpidev           20            2K           20
          freeblks            5            2K         4252
            crypto            2            2K            2
               msi            9            2K            9
               tun            7            2K            7
       ipsecpolicy            1            1K            1
            sahead            1            1K            1
          secasvar            1            1K            1
             clone            8            1K            8
      NFSD session            1            1K            1
             mkdir            7            1K         8344
        CAM periph            4            1K          270
               mld            6            1K            6
              igmp            6            1K            6
         toponodes            6            1K            6
            isadev            6            1K            6
             mount           16            1K           86
          pci_link           10            1K           10
       inpcbpolicy           20            1K        17533
          sctp_ifn            5            1K            6
           CAM SIM            2            1K            2
           softdep            1            1K            1
            diradd            4            1K         4323
    chacha20random            1            1K            1
             epoch            4            1K            4
              cdev            2            1K            2
 encap_export_host            8            1K            8
              pfil            3            1K            3
               osd            3            1K            9
         newdirblk            4            1K         4172
            vnodes            1            1K            1
      NFSD lckfile            1            1K            1
     NFSD V4client            1            1K            1
             DEVFS            9            1K           10
            feeder            7            1K            7
        loginclass            3            1K            3
          CAM path            4            1K         1030
            apmdev            1            1K            1
          atkbddev            2            1K            2
          pmchooks            1            1K            1
            prison            4            1K            4
     CAM dev queue            2            1K            2
 CAM I/O Scheduler            1            1K            1
            soname            4            1K         6361
          nexusdev            5            1K            5
           entropy            2            1K           42
           tcpfunc            1            1K            1
          sctp_vrf            1            1K            1
              vnet            1            1K            1
          acpiintr            1            1K            1
               pmc            1            1K            1
          filecaps            4            1K           98
              cpus            2            1K            2
    vnet_data_free            1            1K            1
           Per-cpu            1            1K            1
          p1003.1b            1            1K            1
           CAM CCB            0            0K         5212
        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
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db> show ktr
No such command; use "help" to list available commands

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/16 01:18 freebsd 902c2ec05a61 eef6e580 console log report ci-freebsd-main
* Struck through repros no longer work on HEAD.