====================================================== WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170824+ #8 Not tainted ------------------------------------------------------ syz-executor2/3373 is trying to acquire lock: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:126 [inline] (cpu_hotplug_lock.rw_sem){++++}, at: [] flush_all_backlogs net/core/dev.c:4592 [inline] (cpu_hotplug_lock.rw_sem){++++}, at: [] rollback_registered_many+0x587/0xe80 net/core/dev.c:7127 but task is already holding lock: (rtnl_mutex){+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (rtnl_mutex){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1870 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 addrconf_dad_work+0xbb/0xfc0 net/ipv6/addrconf.c:3890 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 -> #2 ((&(&ifa->dad_work)->work)){+.+.}: process_one_work+0xba5/0x1be0 kernel/workqueue.c:2095 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 0xffffffffffffffff -> #1 ((complete)&rcu.completion){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 complete_acquire include/linux/completion.h:39 [inline] __wait_for_common kernel/sched/completion.c:108 [inline] wait_for_common kernel/sched/completion.c:122 [inline] wait_for_completion+0xc8/0x770 kernel/sched/completion.c:143 __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898 synchronize_srcu_expedited kernel/rcu/srcutree.c:923 [inline] synchronize_srcu+0x1a3/0x560 kernel/rcu/srcutree.c:974 quarantine_remove_cache+0xd7/0xf0 mm/kasan/quarantine.c:327 kasan_cache_shrink+0x9/0x10 mm/kasan/kasan.c:380 kmem_cache_shrink+0x15/0x30 mm/slab_common.c:857 acpi_os_purge_cache+0x15/0x20 drivers/acpi/osl.c:1560 acpi_purge_cached_objects+0x38/0xc9 drivers/acpi/acpica/utxface.c:271 acpi_initialize_objects+0xc5/0x112 drivers/acpi/acpica/utxfinit.c:302 acpi_bus_init drivers/acpi/bus.c:1131 [inline] acpi_init+0x23c/0x8e6 drivers/acpi/bus.c:1220 do_one_initcall+0x9e/0x330 init/main.c:826 do_initcall_level init/main.c:892 [inline] do_initcalls init/main.c:900 [inline] do_basic_setup init/main.c:918 [inline] kernel_init_freeable+0x469/0x521 init/main.c:1066 kernel_init+0x13/0x172 init/main.c:993 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 -> #0 (cpu_hotplug_lock.rw_sem){++++}: check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894 check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline] percpu_down_read include/linux/percpu-rwsem.h:58 [inline] cpus_read_lock+0x42/0x90 kernel/cpu.c:218 get_online_cpus include/linux/cpu.h:126 [inline] flush_all_backlogs net/core/dev.c:4592 [inline] rollback_registered_many+0x587/0xe80 net/core/dev.c:7127 rollback_registered+0x1be/0x3c0 net/core/dev.c:7183 unregister_netdevice_queue+0x2e3/0x5d0 net/core/dev.c:8171 unregister_netdevice include/linux/netdevice.h:2428 [inline] __tun_detach+0x1020/0x1390 drivers/net/tun.c:576 tun_detach drivers/net/tun.c:587 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2595 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:246 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 entry_SYSCALL_64_fastpath+0x1f/0xbe other info that might help us debug this: Chain exists of: cpu_hotplug_lock.rw_sem --> (&(&ifa->dad_work)->work) --> rtnl_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock((&(&ifa->dad_work)->work)); lock(rtnl_mutex); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 1 lock held by syz-executor2/3373: #0: (rtnl_mutex){+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 stack backtrace: CPU: 0 PID: 3373 Comm: syz-executor2 Not tainted 4.13.0-rc6-next-20170824+ #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_circular_bug+0x503/0x710 kernel/locking/lockdep.c:1259 check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894 check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline] percpu_down_read include/linux/percpu-rwsem.h:58 [inline] cpus_read_lock+0x42/0x90 kernel/cpu.c:218 get_online_cpus include/linux/cpu.h:126 [inline] flush_all_backlogs net/core/dev.c:4592 [inline] rollback_registered_many+0x587/0xe80 net/core/dev.c:7127 rollback_registered+0x1be/0x3c0 net/core/dev.c:7183 unregister_netdevice_queue+0x2e3/0x5d0 net/core/dev.c:8171 unregister_netdevice include/linux/netdevice.h:2428 [inline] __tun_detach+0x1020/0x1390 drivers/net/tun.c:576 tun_detach drivers/net/tun.c:587 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2595 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:246 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x446749 RSP: 002b:0000000000a5f9e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000b794 RCX: 0000000000446749 RDX: 0000000000000000 RSI: 0000000000752cb8 RDI: 0000000000000000 RBP: 0000000000000086 R08: 0000007b00000018 R09: 0000000000000019 R10: 0000001ddbc25c24 R11: 0000000000000206 R12: 0000000000a5f980 R13: 00000000007080a8 R14: 00000000000003cb R15: 0000000000000020 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3421 comm=syz-executor5 *** Guest State *** CR0: actual=0x0000000000000020, shadow=0x0000000000000000, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=fffffffffffff871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000f80 RIP = 0x0000000000000000 RFLAGS=0x00000002 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000f80 CS:RIP=0030:0000000000002810 CS: sel=0x0000, attr=0x10000, limit=0x00080000, base=0x0000000000000000 DS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x000000000000d000 SS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 ES: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 FS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 GS: sel=0x000f, attr=0x10000, limit=0x00000000, base=0x0000000000000000 GDTR: limit=0x0000fffe, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 IDTR: limit=0x00000000, base=0x0000000000000000 TR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 BndCfgS = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b6277 RSP = 0xffff880051c3f4c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f617b9bb700 GSBase=ffff88003ed00000 TRBase=ffff88003ed23100 GDTBase=ffffffffff576000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=0000000038073000 CR4=00000000000026e0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84d9d0b0 EFER = 0x0000000000000d01 PAT = 0x0007040600070406 *** Control State *** PinBased=0000007f CPUBased=b6a1edfa SecondaryExec=001000e3 EntryControls=0001d1ff ExitControls=00afefff ExceptionBitmap=00060042 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 = 0xffffffd2860c9110 TPR Threshold = 0x00 EPT pointer = 0x000000003a7ef01e Virtual processor ID = 0x0001 *** Guest State *** CR0: actual=0x0000000000000020, shadow=0x0000000000000000, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=fffffffffffff871 CR3 = 0x00000000fffbc000 RSP = 0x0000000000000f80 RIP = 0x0000000000000000 RFLAGS=0x00000002 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000f80 CS:RIP=0030:0000000000002810 CS: sel=0x0000, attr=0x10000, limit=0x00080000, base=0x0000000000000000 DS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x000000000000d000 SS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 ES: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 FS: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 GS: sel=0x000f, attr=0x10000, limit=0x00000000, base=0x0000000000000000 GDTR: limit=0x0000fffe, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 IDTR: limit=0x00000000, base=0x0000000000000000 TR: sel=0x0000, attr=0x10000, limit=0x00000000, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 BndCfgS = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 audit: type=1326 audit(1503569288.433:3): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3463 comm="syz-executor5" exe="/syz-executor5" sig=9 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0x0 *** Host State *** RIP = 0xffffffff811b6277 RSP = 0xffff88004f91f4c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f617b954700 GSBase=ffff88006df00000 TRBase=ffff88006df23100 GDTBase=ffffffffff574000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=0000000038073000 CR4=00000000000026e0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84d9d0b0 EFER = 0x0000000000000d01 PAT = 0x0007040600070406 *** Control State *** PinBased=0000007f CPUBased=b6a1edfa SecondaryExec=001000e3 EntryControls=0001d1ff ExitControls=00afefff capability: warning: `syz-executor1' uses 32-bit capabilities (legacy support in use) ExceptionBitmap=00060042 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 = 0xffffffd273b23694 TPR Threshold = 0x00 EPT pointer = 0x0000000069d2b01e Virtual processor ID = 0x0005 audit: type=1326 audit(1503569288.514:4): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3463 comm="syz-executor5" exe="/syz-executor5" sig=9 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0x0 netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. audit: type=1326 audit(1503569288.619:5): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3502 comm="syz-executor1" exe="/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 syz-executor6 uses obsolete (PF_INET,SOCK_PACKET) netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. audit: type=1326 audit(1503569288.687:6): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3502 comm="syz-executor1" exe="/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. mmap: syz-executor7 (3546) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. audit: type=1326 audit(1503569288.934:7): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3595 comm="syz-executor1" exe="/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 audit: type=1326 audit(1503569289.073:8): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3595 comm="syz-executor1" exe="/syz-executor1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 audit: type=1326 audit(1503569289.103:9): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=3615 comm="syz-executor6" exe="/syz-executor6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0x0 hid-generic 0003:0627:0001.0001: pid 3616 passed too large report hid-generic 0003:0627:0001.0001: pid 3649 passed too large report netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor0'. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3812 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=65535 sclass=netlink_xfrm_socket pig=3862 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=65535 sclass=netlink_xfrm_socket pig=3867 comm=syz-executor6 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x4000008f data 0x4000f1 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x4000008e data 0x4000f2 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x4000008d data 0x4000f3 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x4000008c data 0x4000f4 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x4000008b data 0x4000f5 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x4000008a data 0x4000f6 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x40000089 data 0x4000f7 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x40000088 data 0x4000f8 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x40000087 data 0x4000f9 kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x40000086 data 0x4000fa kvm [4269]: vcpu0, guest rIP: 0x910f Hyper-V uhandled wrmsr: 0x40000020 data 0x400160 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=513 sclass=netlink_route_socket pig=4865 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=513 sclass=netlink_route_socket pig=4868 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=513 sclass=netlink_route_socket pig=4885 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=513 sclass=netlink_route_socket pig=4885 comm=syz-executor0 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 3 PID: 5815 Comm: syz-executor4 Not tainted 4.13.0-rc6-next-20170824+ #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:31 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3625 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:666 [inline] wb_start_writeback+0x11b/0x4c0 fs/fs-writeback.c:948 wakeup_flusher_threads+0x454/0x930 fs/fs-writeback.c:1974 sys_sync+0xd8/0x1c0 fs/sync.c:111 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x446749 RSP: 002b:00007fd71e9f2c08 EFLAGS: 00000296 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fd71e9f2a00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 00000000004a8096 R13: 0000000000000000 R14: 00007fd71e9f29c8 R15: 00007fd71e9f2b38 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 2 PID: 5915 Comm: syz-executor3 Not tainted 4.13.0-rc6-next-20170824+ #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:31 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3625 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:666 [inline] wb_start_writeback+0x11b/0x4c0 fs/fs-writeback.c:948 wakeup_flusher_threads+0x454/0x930 fs/fs-writeback.c:1974 sys_sync+0xd8/0x1c0 fs/sync.c:111 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x446749 RSP: 002b:00007f7df4008c08 EFLAGS: 00000296 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f7df4008a00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 00000000004a8096 R13: 0000000000000000 R14: 00007f7df40089c8 R15: 00007f7df4008b38 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 3 PID: 6124 Comm: syz-executor6 Not tainted 4.13.0-rc6-next-20170824+ #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:31 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3625 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:666 [inline] wb_start_writeback+0x11b/0x4c0 fs/fs-writeback.c:948 wakeup_flusher_threads+0x454/0x930 fs/fs-writeback.c:1974 sys_sync+0xd8/0x1c0 fs/sync.c:111 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x446749 RSP: 002b:00007fcb34103c08 EFLAGS: 00000296 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fcb34103a00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 00000000004a8096 R13: 0000000000000000 R14: 00007fcb341039c8 R15: 00007fcb34103b38 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 2 PID: 6175 Comm: syz-executor0 Not tainted 4.13.0-rc6-next-20170824+ #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:31 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3625 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:666 [inline] wb_start_writeback+0x11b/0x4c0 fs/fs-writeback.c:948 wakeup_flusher_threads+0x454/0x930 fs/fs-writeback.c:1974 sys_sync+0xd8/0x1c0 fs/sync.c:111 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x446749 RSP: 002b:00007f7355b50c08 EFLAGS: 00000296 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f7355b50a00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 00000000004a8096 R13: 0000000000000000 R14: 00007f7355b509c8 R15: 00007f7355b50b38 audit: type=1326 audit(1503569297.593:10): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6250 comm="syz-executor0" exe="/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 nla_parse: 111 callbacks suppressed netlink: 21 bytes leftover after parsing attributes in process `syz-executor0'. audit: type=1326 audit(1503569297.759:11): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6250 comm="syz-executor0" exe="/syz-executor0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x446749 code=0xffff0000 netlink: 21 bytes leftover after parsing attributes in process `syz-executor0'.