Hello, syzkaller hit the following crash on a31cc455c512f3f1dd5f79cac8e29a7c8a617af8 git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master compiler: gcc (GCC) 7.1.1 20170620 .config is attached Raw console output is attached. ====================================================== WARNING: possible circular locking dependency detected 4.13.0-next-20170911+ #19 Not tainted ------------------------------------------------------ syz-executor5/6914 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: [] lru_add_drain_all+0xe/0x20 mm/swap.c:729 but task is already holding lock: (&sb->s_type->i_mutex_key#9){++++}, at: [] inode_lock include/linux/fs.h:712 [inline] (&sb->s_type->i_mutex_key#9){++++}, at: [] shmem_add_seals+0x197/0x1060 mm/shmem.c:2768 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&sb->s_type->i_mutex_key#9){++++}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 down_write+0x87/0x120 kernel/locking/rwsem.c:53 inode_lock include/linux/fs.h:712 [inline] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3141 call_write_iter include/linux/fs.h:1770 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:673 do_iter_write+0x15a/0x540 fs/read_write.c:952 vfs_iter_write+0x77/0xb0 fs/read_write.c:965 iter_file_splice_write+0x7e9/0xf50 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x7d5/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0xbe -> #5 (&pipe->mutex/1){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/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 pipe_lock_nested fs/pipe.c:66 [inline] pipe_lock+0x56/0x70 fs/pipe.c:74 iter_file_splice_write+0x264/0xf50 fs/splice.c:699 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0x7d5/0x1630 fs/splice.c:1382 entry_SYSCALL_64_fastpath+0x1f/0xbe -> #4 (sb_writers){.+.+}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:35 [inline] percpu_down_read include/linux/percpu-rwsem.h:58 [inline] __sb_start_write+0x18f/0x290 fs/super.c:1341 sb_start_write include/linux/fs.h:1541 [inline] mnt_want_write+0x3f/0xb0 fs/namespace.c:387 filename_create+0x12b/0x520 fs/namei.c:3628 kern_path_create+0x33/0x40 fs/namei.c:3674 handle_create+0xc0/0x760 drivers/base/devtmpfs.c:203 -> #3 ((complete)&req.done){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/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 devtmpfs_create_node+0x32b/0x4a0 drivers/base/devtmpfs.c:115 device_add+0x120f/0x1640 drivers/base/core.c:1824 device_create_groups_vargs+0x1f3/0x250 drivers/base/core.c:2430 device_create_vargs drivers/base/core.c:2470 [inline] device_create+0xda/0x110 drivers/base/core.c:2506 msr_device_create+0x26/0x40 arch/x86/kernel/msr.c:188 cpuhp_invoke_callback+0x256/0x14d0 kernel/cpu.c:145 cpuhp_thread_fun+0x265/0x520 kernel/cpu.c:434 smpboot_thread_fn+0x489/0x850 kernel/smpboot.c:164 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 -> #2 (cpuhp_state){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 cpuhp_invoke_ap_callback kernel/cpu.c:467 [inline] cpuhp_issue_call+0x1a2/0x3e0 kernel/cpu.c:1308 __cpuhp_setup_state_cpuslocked+0x2d6/0x5f0 kernel/cpu.c:1455 __cpuhp_setup_state+0xb0/0x140 kernel/cpu.c:1484 cpuhp_setup_state include/linux/cpuhotplug.h:177 [inline] page_writeback_init+0x4d/0x71 mm/page-writeback.c:2082 pagecache_init+0x48/0x4f mm/filemap.c:871 start_kernel+0x6c1/0x754 init/main.c:690 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:377 x86_64_start_kernel+0x87/0x8a arch/x86/kernel/head64.c:358 verify_cpu+0x0/0xfb -> #1 (cpuhp_state_mutex){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x328f/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 __cpuhp_setup_state_cpuslocked+0x5b/0x5f0 kernel/cpu.c:1430 __cpuhp_setup_state+0xb0/0x140 kernel/cpu.c:1484 cpuhp_setup_state_nocalls include/linux/cpuhotplug.h:205 [inline] kvm_guest_init+0x1f3/0x20f arch/x86/kernel/kvm.c:488 setup_arch+0x1899/0x1ab3 arch/x86/kernel/setup.c:1295 start_kernel+0xa5/0x754 init/main.c:530 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:377 x86_64_start_kernel+0x87/0x8a arch/x86/kernel/head64.c:358 verify_cpu+0x0/0xfb -> #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+0x328f/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] lru_add_drain_all+0xe/0x20 mm/swap.c:729 shmem_wait_for_pins mm/shmem.c:2672 [inline] shmem_add_seals+0x3e1/0x1060 mm/shmem.c:2780 shmem_fcntl+0xfe/0x130 mm/shmem.c:2815 do_fcntl+0x7d0/0x1060 fs/fcntl.c:420 SYSC_fcntl fs/fcntl.c:462 [inline] SyS_fcntl+0xdc/0x120 fs/fcntl.c:447 entry_SYSCALL_64_fastpath+0x1f/0xbe other info that might help us debug this: Chain exists of: cpu_hotplug_lock.rw_sem --> &pipe->mutex/1 --> &sb->s_type->i_mutex_key#9 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#9); lock(&pipe->mutex/1); lock(&sb->s_type->i_mutex_key#9); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 1 lock held by syz-executor5/6914: #0: (&sb->s_type->i_mutex_key#9){++++}, at: [] inode_lock include/linux/fs.h:712 [inline] #0: (&sb->s_type->i_mutex_key#9){++++}, at: [] shmem_add_seals+0x197/0x1060 mm/shmem.c:2768 stack backtrace: CPU: 0 PID: 6914 Comm: syz-executor5 Not tainted 4.13.0-next-20170911+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 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+0x328f/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] lru_add_drain_all+0xe/0x20 mm/swap.c:729 shmem_wait_for_pins mm/shmem.c:2672 [inline] shmem_add_seals+0x3e1/0x1060 mm/shmem.c:2780 shmem_fcntl+0xfe/0x130 mm/shmem.c:2815 do_fcntl+0x7d0/0x1060 fs/fcntl.c:420 SYSC_fcntl fs/fcntl.c:462 [inline] SyS_fcntl+0xdc/0x120 fs/fcntl.c:447 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x451e59 RSP: 002b:00007f4d15f12c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 00000000007180b0 RCX: 0000000000451e59 RDX: 000000000000000a RSI: 0000000000000409 RDI: 0000000000000017 RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000 R13: 0000000000a6f7ef R14: 00007f4d15f139c0 R15: 0000000000000002 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=32768 sclass=netlink_xfrm_socket pig=6942 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=32768 sclass=netlink_xfrm_socket pig=6958 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1817 sclass=netlink_route_socket pig=7056 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1817 sclass=netlink_route_socket pig=7071 comm=syz-executor0 device gre0 entered promiscuous mode audit: type=1326 audit(1505170621.197:24): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7144 comm="syz-executor7" exe="/root/syz-executor7" sig=9 arch=c000003e syscall=202 compat=0 ip=0x451e59 code=0x0 audit: type=1326 audit(1505170621.314:25): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7144 comm="syz-executor7" exe="/root/syz-executor7" sig=9 arch=c000003e syscall=202 compat=0 ip=0x451e59 code=0x0 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x00000000e0000031, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000212061, shadow=0x0000000000212021, gh_mask=ffffffffffffe871 CR3 = 0x0000000000002000 RSP = 0x0000000000000f80 RIP = 0x000000000000000b RFLAGS=0x00000082 DR7 = 0x0000000000000400 Sysenter RSP=0000000000000f80 CS:RIP=0050:0000000000002810 CS: sel=0x0030, attr=0x0409b, limit=0x000fffff, base=0x0000000000000000 DS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 SS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 ES: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 FS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 GS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 GDTR: limit=0x000007ff, base=0x0000000000001000 LDTR: sel=0x0008, attr=0x04082, limit=0x000007ff, base=0x0000000000001800 IDTR: limit=0x000001ff, base=0x0000000000003800 TR: sel=0x0000, attr=0x0008b, limit=0x0000ffff, base=0x0000000000000000 EFER = 0x0000000000000501 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 Interruptibility = 00000000 ActivityState = 00000000 *** Host State *** RIP = 0xffffffff811b8bff RSP = 0xffff8801c57c74c8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007f6116fe3700 GSBase=ffff8801db200000 TRBase=ffff8801db223100 GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000 CR0=0000000080050033 CR3=00000001c3448000 CR4=00000000001426f0 Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84d3ebf0 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b6986dfa SecondaryExec=0000004a EntryControls=0000d3ff ExitControls=0023efff ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000003 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffffd52f4ba64f EPT pointer = 0x00000001d9a8c01e device syz4 entered promiscuous mode device syz4 left promiscuous mode device syz4 entered promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl nla_parse: 3 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl audit: type=1326 audit(1505170623.164:26): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7523 comm="syz-executor4" exe="/root/syz-executor4" sig=9 arch=c000003e syscall=202 compat=0 ip=0x451e59 code=0x0 QAT: Invalid ioctl QAT: Invalid ioctl audit: type=1326 audit(1505170623.271:27): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7523 comm="syz-executor4" exe="/root/syz-executor4" sig=9 arch=c000003e syscall=202 compat=0 ip=0x451e59 code=0x0 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl sctp: [Deprecated]: syz-executor7 (pid 7652) Use of int in max_burst socket option. Use struct sctp_assoc_value instead QAT: Invalid ioctl sctp: [Deprecated]: syz-executor7 (pid 7661) Use of int in max_burst socket option. Use struct sctp_assoc_value instead FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4355 sclass=netlink_route_socket pig=7703 comm=syz-executor4 QAT: Invalid ioctl QAT: Invalid ioctl SELinux: unrecognized netlink message: protocol=0 nlmsg_type=4355 sclass=netlink_route_socket pig=7707 comm=syz-executor4 QAT: Invalid ioctl QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl CPU: 1 PID: 7690 Comm: syz-executor2 Not tainted 4.13.0-next-20170911+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 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+0x47/0x760 mm/slab.c:3559 mpol_new+0x144/0x2e0 mm/mempolicy.c:275 do_mbind+0x1d0/0xce0 mm/mempolicy.c:1189 SYSC_mbind mm/mempolicy.c:1341 [inline] SyS_mbind+0x13b/0x150 mm/mempolicy.c:1323 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x451e59 RSP: 002b:00007f659d8e2c08 EFLAGS: 00000216 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 0000000000451e59 RDX: 0000000000004003 RSI: 0000000000003000 RDI: 0000000020007000 RBP: 00007f659d8e2a10 R08: 0000000000000020 R09: 0000000000000000 R10: 000000002000cff8 R11: 0000000000000216 R12: 00000000004b69f7 R13: 00007f659d8e2b48 R14: 00000000004b6a07 R15: 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl sctp: [Deprecated]: syz-executor7 (pid 7835) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl sctp: [Deprecated]: syz-executor7 (pid 7852) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 7966 Comm: syz-executor5 Not tainted 4.13.0-next-20170911+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 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_fail_alloc_page mm/page_alloc.c:2915 [inline] prepare_alloc_pages mm/page_alloc.c:4151 [inline] __alloc_pages_nodemask+0x338/0xd80 mm/page_alloc.c:4187 alloc_pages_current+0xb6/0x1e0 mm/mempolicy.c:2035 alloc_pages include/linux/gfp.h:505 [inline] skb_page_frag_refill+0x358/0x5f0 net/core/sock.c:2196 tun_build_skb.isra.42+0x2a2/0x1690 drivers/net/tun.c:1289 tun_get_user+0x1dad/0x2150 drivers/net/tun.c:1455 tun_chr_write_iter+0xde/0x190 drivers/net/tun.c:1579 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x40c2c1 RSP: 002b:00007f4d15f33c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000040c2c1 RDX: 000000000000004e RSI: 000000002000cfbc RDI: 0000000000000015 RBP: 00007f4d15f33a10 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000f4240 R11: 0000000000000293 R12: 00000000004b69f7 R13: 00007f4d15f33b48 R14: 00000000004b6a07 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7979 Comm: syz-executor5 Not tainted 4.13.0-next-20170911+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 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+0x47/0x760 mm/slab.c:3559 __build_skb+0x9d/0x450 net/core/skbuff.c:284 build_skb+0x6f/0x260 net/core/skbuff.c:316 tun_build_skb.isra.42+0x92f/0x1690 drivers/net/tun.c:1346 tun_get_user+0x1dad/0x2150 drivers/net/tun.c:1455 tun_chr_write_iter+0xde/0x190 drivers/net/tun.c:1579 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x40c2c1 RSP: 002b:00007f4d15f33c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000040c2c1 RDX: 000000000000004e RSI: 000000002000cfbc RDI: 0000000000000015 RBP: 00007f4d15f33a10 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000f4240 R11: 0000000000000293 R12: 00000000004b69f7 R13: 00007f4d15f33b48 R14: 00000000004b6a07 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7984 Comm: syz-executor5 Not tainted 4.13.0-next-20170911+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 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+0x47/0x760 mm/slab.c:3559 dst_alloc+0x11f/0x1a0 net/core/dst.c:107 __ip6_dst_alloc+0x34/0x60 net/ipv6/route.c:355 ip6_rt_pcpu_alloc net/ipv6/route.c:1031 [inline] rt6_make_pcpu_route net/ipv6/route.c:1061 [inline] ip6_pol_route+0x1500/0x2c90 net/ipv6/route.c:1186 ip6_pol_route_input+0x5a/0x70 net/ipv6/route.c:1200 fib6_rule_lookup+0x9e/0x2a0 net/ipv6/ip6_fib.c:299 ip6_route_input_lookup+0x8a/0xa0 net/ipv6/route.c:1210 ip6_route_input+0x656/0xa20 net/ipv6/route.c:1283 ip6_rcv_finish+0x14b/0x7a0 net/ipv6/ip6_input.c:69 NF_HOOK include/linux/netfilter.h:249 [inline] ipv6_rcv+0xff0/0x2190 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x19af/0x33d0 net/core/dev.c:4423 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4461 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4534 netif_receive_skb+0xae/0x390 net/core/dev.c:4558 tun_rx_batched.isra.43+0x5ed/0x860 drivers/net/tun.c:1218 tun_get_user+0x11dd/0x2150 drivers/net/tun.c:1553 tun_chr_write_iter+0xde/0x190 drivers/net/tun.c:1579 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x40c2c1 RSP: 002b:00007f4d15f33c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000040c2c1 RDX: 000000000000004e RSI: 000000002000cfbc RDI: 0000000000000015 RBP: 00007f4d15f33a10 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000f4240 R11: 0000000000000293 R12: 00000000004b69f7 R13: 00007f4d15f33b48 R14: 00000000004b6a07 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7996 Comm: syz-executor5 Not tainted 4.13.0-next-20170911+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 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_node mm/slab.c:3304 [inline] kmem_cache_alloc_node+0x56/0x760 mm/slab.c:3649 __alloc_skb+0xf1/0x740 net/core/skbuff.c:194 alloc_skb include/linux/skbuff.h:976 [inline] alloc_skb_with_frags+0x10d/0x710 net/core/skbuff.c:5137 sock_alloc_send_pskb+0x7b4/0x9d0 net/core/sock.c:2073 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2090 __ip6_append_data.isra.42+0x1bd9/0x32b0 net/ipv6/ip6_output.c:1390 ip6_append_data+0x189/0x290 net/ipv6/ip6_output.c:1552 icmpv6_echo_reply+0x11ac/0x1d60 net/ipv6/icmp.c:740 icmpv6_rcv+0x1160/0x18d0 net/ipv6/icmp.c:858 ip6_input_finish+0x36f/0x16d0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:249 [inline] ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:478 [inline] ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:249 [inline] ipv6_rcv+0xff0/0x2190 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x19af/0x33d0 net/core/dev.c:4423 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4461 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4534 netif_receive_skb+0xae/0x390 net/core/dev.c:4558 tun_rx_batched.isra.43+0x5ed/0x860 drivers/net/tun.c:1218 tun_get_user+0x11dd/0x2150 drivers/net/tun.c:1553 tun_chr_write_iter+0xde/0x190 drivers/net/tun.c:1579 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x40c2c1 RSP: 002b:00007f4d15f33c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000040c2c1 RDX: 000000000000004e RSI: 000000002000cfbc RDI: 0000000000000015 RBP: 00007f4d15f33a10 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000f4240 R11: 0000000000000293 R12: 00000000004b69f7 R13: 00007f4d15f33b48 R14: 00000000004b6a07 R15: 0000000000000000 capability: warning: `syz-executor2' uses deprecated v2 capabilities in a way that may be insecure QAT: Invalid ioctl FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 8034 Comm: syz-executor5 Not tainted 4.13.0-next-20170911+ #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 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_node mm/slab.c:3304 [inline] kmem_cache_alloc_node_trace+0x5a/0x760 mm/slab.c:3668 __do_kmalloc_node mm/slab.c:3688 [inline] __kmalloc_node_track_caller+0x33/0x70 mm/slab.c:3703 __kmalloc_reserve.isra.40+0x41/0xd0 net/core/skbuff.c:138 __alloc_skb+0x13b/0x740 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:976 [inline] alloc_skb_with_frags+0x10d/0x710 net/core/skbuff.c:5137 sock_alloc_send_pskb+0x7b4/0x9d0 net/core/sock.c:2073 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2090 __ip6_append_data.isra.42+0x1bd9/0x32b0 net/ipv6/ip6_output.c:1390 ip6_append_data+0x189/0x290 net/ipv6/ip6_output.c:1552 icmpv6_echo_reply+0x11ac/0x1d60 net/ipv6/icmp.c:740 icmpv6_rcv+0x1160/0x18d0 net/ipv6/icmp.c:858 ip6_input_finish+0x36f/0x16d0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:249 [inline] ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:478 [inline] ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:249 [inline] ipv6_rcv+0xff0/0x2190 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x19af/0x33d0 net/core/dev.c:4423 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4461 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4534 netif_receive_skb+0xae/0x390 net/core/dev.c:4558 tun_rx_batched.isra.43+0x5ed/0x860 drivers/net/tun.c:1218 tun_get_user+0x11dd/0x2150 drivers/net/tun.c:1553 tun_chr_write_iter+0xde/0x190 drivers/net/tun.c:1579 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x40c2c1 RSP: 002b:00007f4d15f33c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000040c2c1 RDX: 000000000000004e RSI: 000000002000cfbc RDI: 0000000000000015 RBP: 00007f4d15f33a10 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000f4240 R11: 0000000000000293 R12: 00000000004b69f7 R13: 00007f4d15f33b48 R14: 00000000004b6a07 R15: 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. Once a fix for this bug is committed, please reply to this email with: #syz fix: exact-commit-title To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report.