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possible deadlock in flush_work (2)

Status: fixed on 2018/02/14 17:41
Subsystems: net nfs
[Documentation on labels]
Reported-by: syzbot+d8fe95298ef830cd7d05e33eefa4a5a6f6f334d4@syzkaller.appspotmail.com
Fix commit: 528fd3547bad SUNRPC: Destroy transport from the system workqueue
First crash: 2596d, last: 2591d
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in flush_work C 180 2598d 2674d 0/28 closed as invalid on 2017/11/01 20:11
linux-4.14 possible deadlock in flush_work C inconclusive 23 1657d 2070d 0/1 upstream: reported C repro on 2019/04/13 06:23
upstream possible deadlock in flush_work (3) net 3 2313d 2313d 0/28 auto-closed as invalid on 2019/02/22 10:34

Sample crash report:
xs_tcp_setup_socket: connect returned unhandled error -113
xs_tcp_setup_socket: connect returned unhandled error -113
xs_tcp_setup_socket: connect returned unhandled error -113

======================================================
WARNING: possible circular locking dependency detected
4.14.0-rc5-mm1+ #20 Not tainted
------------------------------------------------------
kworker/0:3/3820 is trying to acquire lock:
 ("xprtiod"){+.+.}, at: [<ffffffff8146adda>] start_flush_work kernel/workqueue.c:2850 [inline]
 ("xprtiod"){+.+.}, at: [<ffffffff8146adda>] flush_work+0x55a/0x8a0 kernel/workqueue.c:2882

but task is already holding lock:
 ((&task->u.tk_work)){+.+.}, at: [<ffffffff81471eb2>] process_one_work+0xb32/0x1bc0 kernel/workqueue.c:2087

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 ((&task->u.tk_work)){+.+.}:
       process_one_work+0xba2/0x1bc0 kernel/workqueue.c:2088
       worker_thread+0x223/0x1990 kernel/workqueue.c:2246
       kthread+0x38b/0x470 kernel/kthread.c:242
       ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431

-> #0 ("xprtiod"){+.+.}:
       lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3991
       start_flush_work kernel/workqueue.c:2851 [inline]
       flush_work+0x57f/0x8a0 kernel/workqueue.c:2882
       __cancel_work_timer+0x30a/0x7e0 kernel/workqueue.c:2954
       cancel_work_sync+0x17/0x20 kernel/workqueue.c:2990
       xprt_destroy+0xa1/0x130 net/sunrpc/xprt.c:1467
       xprt_destroy_kref net/sunrpc/xprt.c:1477 [inline]
       kref_put include/linux/kref.h:70 [inline]
       xprt_put+0x38/0x40 net/sunrpc/xprt.c:1501
       rpc_task_release_client+0x299/0x430 net/sunrpc/clnt.c:986
       rpc_release_resources_task+0x7f/0xa0 net/sunrpc/sched.c:1020
       rpc_release_task net/sunrpc/sched.c:1059 [inline]
       __rpc_execute+0x4d9/0xe70 net/sunrpc/sched.c:824
       rpc_async_schedule+0x16/0x20 net/sunrpc/sched.c:848
       process_one_work+0xbf0/0x1bc0 kernel/workqueue.c:2112
       worker_thread+0x223/0x1990 kernel/workqueue.c:2246
       kthread+0x38b/0x470 kernel/kthread.c:242
       ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock((&task->u.tk_work));
                               lock("xprtiod");
                               lock((&task->u.tk_work));
  lock("xprtiod");

 *** DEADLOCK ***

2 locks held by kworker/0:3/3820:
 #0:  ("rpciod"){+.+.}, at: [<ffffffff81471e5f>] __write_once_size include/linux/compiler.h:305 [inline]
 #0:  ("rpciod"){+.+.}, at: [<ffffffff81471e5f>] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline]
 #0:  ("rpciod"){+.+.}, at: [<ffffffff81471e5f>] atomic_long_set include/asm-generic/atomic-long.h:56 [inline]
 #0:  ("rpciod"){+.+.}, at: [<ffffffff81471e5f>] set_work_data kernel/workqueue.c:618 [inline]
 #0:  ("rpciod"){+.+.}, at: [<ffffffff81471e5f>] set_work_pool_and_clear_pending kernel/workqueue.c:645 [inline]
 #0:  ("rpciod"){+.+.}, at: [<ffffffff81471e5f>] process_one_work+0xadf/0x1bc0 kernel/workqueue.c:2083
 #1:  ((&task->u.tk_work)){+.+.}, at: [<ffffffff81471eb2>] process_one_work+0xb32/0x1bc0 kernel/workqueue.c:2087

stack backtrace:
CPU: 0 PID: 3820 Comm: kworker/0:3 Not tainted 4.14.0-rc5-mm1+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: rpciod rpc_async_schedule
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 print_circular_bug.isra.41+0x342/0x36a kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1901 [inline]
 check_prevs_add kernel/locking/lockdep.c:2018 [inline]
 validate_chain kernel/locking/lockdep.c:2460 [inline]
 __lock_acquire+0x2f55/0x3d50 kernel/locking/lockdep.c:3487
 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3991
 start_flush_work kernel/workqueue.c:2851 [inline]
 flush_work+0x57f/0x8a0 kernel/workqueue.c:2882
 __cancel_work_timer+0x30a/0x7e0 kernel/workqueue.c:2954
 cancel_work_sync+0x17/0x20 kernel/workqueue.c:2990
 xprt_destroy+0xa1/0x130 net/sunrpc/xprt.c:1467
 xprt_destroy_kref net/sunrpc/xprt.c:1477 [inline]
 kref_put include/linux/kref.h:70 [inline]
 xprt_put+0x38/0x40 net/sunrpc/xprt.c:1501
 rpc_task_release_client+0x299/0x430 net/sunrpc/clnt.c:986
 rpc_release_resources_task+0x7f/0xa0 net/sunrpc/sched.c:1020
 rpc_release_task net/sunrpc/sched.c:1059 [inline]
 __rpc_execute+0x4d9/0xe70 net/sunrpc/sched.c:824
 rpc_async_schedule+0x16/0x20 net/sunrpc/sched.c:848
 process_one_work+0xbf0/0x1bc0 kernel/workqueue.c:2112
 worker_thread+0x223/0x1990 kernel/workqueue.c:2246
 kthread+0x38b/0x470 kernel/kthread.c:242
 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
QAT: Invalid ioctl
*** Guest State ***
CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
QAT: Invalid ioctl
QAT: Invalid ioctl
CR3 = 0x00000000fffbc000
RSP = 0x000000000000fffa  RIP = 0x0000000000000000
RFLAGS=0x00033000         DR7 = 0x0000000000000400
QAT: Invalid ioctl
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
DS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
QAT: Invalid ioctl
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811b9453  RSP = 0xffff8801c67bf4c8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f1a34fb3700 GSBase=ffff8801db300000 TRBase=ffff8801db322d40
GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000
CR0=0000000080050033 CR3=00000001c3ee5000 CR4=00000000001426e0
Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84e590f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000043
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffff93c1db7b71
TPR Threshold = 0x00
EPT pointer = 0x000000019d00201e
*** Guest State ***
CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
CR3 = 0x00000000fffbc000
RSP = 0x000000000000fffa  RIP = 0x0000000000000000
RFLAGS=0x00033000         DR7 = 0x0000000000000400
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
DS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811b9453  RSP = 0xffff8801cb8b74c8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f1a34fb3700 GSBase=ffff8801db200000 TRBase=ffff8801db322d40
GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000
CR0=0000000080050033 CR3=00000001cbb5d000 CR4=00000000001426f0
Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84e590f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000043
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffff92e5540734
TPR Threshold = 0x00
EPT pointer = 0x00000001d433b01e
*** Guest State ***
CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
CR3 = 0x00000000fffbc000
RSP = 0x000000000000fffa  RIP = 0x0000000000000000
RFLAGS=0x00033000         DR7 = 0x0000000000000400
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
DS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811b9453  RSP = 0xffff8801c160f4c8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f1a34fb3700 GSBase=ffff8801db200000 TRBase=ffff8801db322d40
GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000
CR0=0000000080050033 CR3=00000001c1e49000 CR4=00000000001426f0
Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84e590f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000043
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffff921b278ff9
TPR Threshold = 0x00
EPT pointer = 0x00000001d26c201e
*** Guest State ***
CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
CR3 = 0x00000000fffbc000
RSP = 0x000000000000fffa  RIP = 0x0000000000000000
RFLAGS=0x00033000         DR7 = 0x0000000000000400
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
DS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811b9453  RSP = 0xffff8801cd58f4c8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f1a34fb3700 GSBase=ffff8801db300000 TRBase=ffff8801db222d40
GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000
CR0=0000000080050033 CR3=00000001d317f000 CR4=00000000001426e0
Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84e590f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000043
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffff91d9b9078c
TPR Threshold = 0x00
EPT pointer = 0x00000001cc03f01e
*** Guest State ***
CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
CR3 = 0x00000000fffbc000
RSP = 0x000000000000fffa  RIP = 0x0000000000000000
RFLAGS=0x00033000         DR7 = 0x0000000000000400
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
DS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811b9453  RSP = 0xffff8801c72474c8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f1a34fb4700 GSBase=ffff8801db300000 TRBase=ffff8801db322d40
GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000
CR0=0000000080050033 CR3=000000019a934000 CR4=00000000001426e0
Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84e590f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b699edfa SecondaryExec=00000042
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffff918c4e7f87
EPT pointer = 0x00000001c1dfb01e
*** Guest State ***
CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
CR3 = 0x00000000fffbc000
RSP = 0x000000000000fffa  RIP = 0x0000000000000000
RFLAGS=0x00033000         DR7 = 0x0000000000000400
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
DS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811b9453  RSP = 0xffff8801d28474c8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f1a34fb3700 GSBase=ffff8801db300000 TRBase=ffff8801db322d40
GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000
CR0=0000000080050033 CR3=00000001d32b4000 CR4=00000000001426e0
Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84e590f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000043
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffff90e4479991
TPR Threshold = 0x00
EPT pointer = 0x00000001d32bc01e
*** Guest State ***
CR0: actual=0x0000000080000031, shadow=0x0000000060000010, gh_mask=fffffffffffffff7
CR4: actual=0x0000000000002051, shadow=0x0000000000000000, gh_mask=ffffffffffffe871
CR3 = 0x00000000fffbc000
RSP = 0x000000000000fffa  RIP = 0x0000000000000000
RFLAGS=0x00033000         DR7 = 0x0000000000000400
Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
CS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
DS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
SS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
ES:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
FS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GS:   sel=0x0000, attr=0x000f3, limit=0x0000ffff, base=0x0000000000000000
GDTR:                           limit=0x0000ffff, base=0x0000000000000000
LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000
IDTR:                           limit=0x0000ffff, base=0x0000000000000000
TR:   sel=0x0000, attr=0x0008b, limit=0x00002088, base=0x0000000000000000
EFER =     0x0000000000000000  PAT = 0x0007040600070406
DebugCtl = 0x0000000000000000  DebugExceptions = 0x0000000000000000
Interruptibility = 00000000  ActivityState = 00000000
*** Host State ***
RIP = 0xffffffff811b9453  RSP = 0xffff8801d28474c8
CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
FSBase=00007f1a34fb3700 GSBase=ffff8801db300000 TRBase=ffff8801db322d40
GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000
CR0=0000000080050033 CR3=00000001d32b4000 CR4=00000000001426e0
Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84e590f0
EFER = 0x0000000000000d01  PAT = 0x0000000000000000
*** Control State ***
PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000043
EntryControls=0000d1ff ExitControls=0023efff
ExceptionBitmap=ffffbfff PFECmask=00000000 PFECmatch=00000000
VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
        reason=80000021 qualification=0000000000000000
IDTVectoring: info=00000000 errcode=00000000
TSC Offset = 0xffffff90b0b2cf23
TPR Threshold = 0x00
EPT pointer = 0x00000001c069e01e

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/11/07 21:10 mmots 0f611fb6dcc0 e0a2b195 .config console log report ci-upstream-mmots-kasan-gce
2017/11/07 08:55 mmots 0f611fb6dcc0 e0a2b195 .config console log report ci-upstream-mmots-kasan-gce
2017/11/03 12:14 mmots 0f611fb6dcc0 e0a2b195 .config console log report ci-upstream-mmots-kasan-gce
* Struck through repros no longer work on HEAD.