binder: 11688:11700 transaction failed 29189/-22, size 24-16 line 2775 ====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc3+ #222 Not tainted ------------------------------------------------------ syz-executor4/11756 is trying to acquire lock: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000141c582c>] inode_lock include/linux/fs.h:713 [inline] (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000141c582c>] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3289 but task is already holding lock: (&pipe->mutex/1){+.+.}, at: [<00000000f1fe300c>] pipe_lock_nested fs/pipe.c:67 [inline] (&pipe->mutex/1){+.+.}, at: [<00000000f1fe300c>] pipe_lock fs/pipe.c:75 [inline] (&pipe->mutex/1){+.+.}, at: [<00000000f1fe300c>] pipe_wait+0x1e6/0x280 fs/pipe.c:123 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&pipe->mutex/1){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 pipe_lock_nested fs/pipe.c:67 [inline] pipe_lock+0x56/0x70 fs/pipe.c:75 iter_file_splice_write+0x264/0xf30 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/0x96 -> #5 (sb_writers){.+.+}: mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 fsnotify_destroy_mark+0x26/0x50 fs/notify/mark.c:390 fsnotify_destroy_marks+0xdf/0x190 fs/notify/mark.c:717 fsnotify_clear_marks_by_inode fs/notify/fsnotify.h:33 [inline] __fsnotify_inode_delete+0x19/0x20 fs/notify/fsnotify.c:35 fsnotify_inoderemove include/linux/fsnotify.h:136 [inline] dentry_unlink_inode+0x49e/0x5e0 fs/dcache.c:371 -> #4 ((completion)&req.done){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 complete_acquire include/linux/completion.h:40 [inline] __wait_for_common kernel/sched/completion.c:109 [inline] wait_for_common kernel/sched/completion.c:123 [inline] wait_for_completion+0xcb/0x7b0 kernel/sched/completion.c:144 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+0x2ea/0x1d20 kernel/cpu.c:182 cpuhp_thread_fun+0x48e/0x7e0 kernel/cpu.c:571 smpboot_thread_fn+0x450/0x7c0 kernel/smpboot.c:164 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441 -> #3 (cpuhp_state-up){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 cpuhp_lock_acquire kernel/cpu.c:85 [inline] cpuhp_invoke_ap_callback kernel/cpu.c:605 [inline] cpuhp_issue_call+0x1e5/0x520 kernel/cpu.c:1495 __cpuhp_setup_state_cpuslocked+0x282/0x600 kernel/cpu.c:1642 __cpuhp_setup_state+0xb0/0x140 kernel/cpu.c:1671 cpuhp_setup_state include/linux/cpuhotplug.h:201 [inline] page_writeback_init+0x4d/0x71 mm/page-writeback.c:2081 pagecache_init+0x48/0x4f mm/filemap.c:977 start_kernel+0x6c1/0x754 init/main.c:695 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 -> #2 (cpuhp_state_mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 __cpuhp_setup_state_cpuslocked+0x5b/0x600 kernel/cpu.c:1617 __cpuhp_setup_state+0xb0/0x140 kernel/cpu.c:1671 cpuhp_setup_state_nocalls include/linux/cpuhotplug.h:229 [inline] kvm_guest_init+0x1f3/0x20f arch/x86/kernel/kvm.c:528 setup_arch+0x17e8/0x1a02 arch/x86/kernel/setup.c:1266 start_kernel+0xa5/0x754 init/main.c:530 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 -> #1 (cpu_hotplug_lock.rw_sem){++++}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] cpus_read_lock+0x42/0x90 kernel/cpu.c:293 get_online_cpus include/linux/cpu.h:117 [inline] lru_add_drain_all+0xe/0x20 mm/swap.c:729 shmem_wait_for_pins mm/shmem.c:2672 [inline] shmem_add_seals+0x3df/0x1060 mm/shmem.c:2780 shmem_fcntl+0xfe/0x130 mm/shmem.c:2815 do_fcntl+0x73e/0x1160 fs/fcntl.c:421 SYSC_fcntl fs/fcntl.c:463 [inline] SyS_fcntl+0xdc/0x120 fs/fcntl.c:448 entry_SYSCALL_64_fastpath+0x1f/0x96 -> #0 (&sb->s_type->i_mutex_key#10){++++}: check_prevs_add kernel/locking/lockdep.c:2031 [inline] validate_chain kernel/locking/lockdep.c:2473 [inline] __lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 down_write+0x87/0x120 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:713 [inline] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3289 call_write_iter include/linux/fs.h:1772 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:653 do_iter_write+0x15a/0x540 fs/read_write.c:932 vfs_iter_write+0x77/0xb0 fs/read_write.c:945 iter_file_splice_write+0x7db/0xf30 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/0x96 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#10 --> sb_writers --> &pipe->mutex/1 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&pipe->mutex/1); lock(sb_writers); lock(&pipe->mutex/1); lock(&sb->s_type->i_mutex_key#10); *** DEADLOCK *** 2 locks held by syz-executor4/11756: #0: (sb_writers#6){.+.+}, at: [<00000000a435019e>] file_start_write include/linux/fs.h:2715 [inline] #0: (sb_writers#6){.+.+}, at: [<00000000a435019e>] do_splice fs/splice.c:1146 [inline] #0: (sb_writers#6){.+.+}, at: [<00000000a435019e>] SYSC_splice fs/splice.c:1402 [inline] #0: (sb_writers#6){.+.+}, at: [<00000000a435019e>] SyS_splice+0x1117/0x1630 fs/splice.c:1382 #1: (&pipe->mutex/1){+.+.}, at: [<00000000f1fe300c>] pipe_lock_nested fs/pipe.c:67 [inline] #1: (&pipe->mutex/1){+.+.}, at: [<00000000f1fe300c>] pipe_lock fs/pipe.c:75 [inline] #1: (&pipe->mutex/1){+.+.}, at: [<00000000f1fe300c>] pipe_wait+0x1e6/0x280 fs/pipe.c:123 stack backtrace: CPU: 0 PID: 11756 Comm: syz-executor4 Not tainted 4.15.0-rc3+ #222 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_circular_bug+0x42d/0x610 kernel/locking/lockdep.c:1271 check_prev_add+0x666/0x15f0 kernel/locking/lockdep.c:1914 check_prevs_add kernel/locking/lockdep.c:2031 [inline] validate_chain kernel/locking/lockdep.c:2473 [inline] __lock_acquire+0x3498/0x47f0 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 down_write+0x87/0x120 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:713 [inline] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3289 call_write_iter include/linux/fs.h:1772 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:653 do_iter_write+0x15a/0x540 fs/read_write.c:932 vfs_iter_write+0x77/0xb0 fs/read_write.c:945 iter_file_splice_write+0x7db/0xf30 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/0x96 RIP: 0033:0x452a39 RSP: 002b:00007fbde3022c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fbde3023700 RCX: 0000000000452a39 RDX: 0000000000000017 RSI: 0000000000000000 RDI: 0000000000000015 RBP: 0000000000a6f880 R08: 00000000fffffffe R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a6f7ff R14: 00007fbde30239c0 R15: 000000000000001b QAT: Invalid ioctl netlink: 'syz-executor2': attribute type 4 has an invalid length. sctp: [Deprecated]: syz-executor3 (pid 11778) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead binder_alloc: binder_alloc_mmap_handler: 11767 20004000-20005000 already mapped failed -16 netlink: 'syz-executor2': attribute type 4 has an invalid length. QAT: Invalid ioctl sctp: [Deprecated]: syz-executor3 (pid 11796) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead kvm: pic: single mode not supported kvm: pic: level sensitive irq not supported device eql entered promiscuous mode nla_parse: 6 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12116 comm=syz-executor1 sock: sock_set_timeout: `syz-executor7' (pid 12174) tries to set negative timeout device gre0 entered promiscuous mode sock: sock_set_timeout: `syz-executor7' (pid 12174) tries to set negative timeout device eql entered promiscuous mode netlink: 2 bytes leftover after parsing attributes in process `syz-executor1'. binder: BINDER_SET_CONTEXT_MGR already set binder: 12223:12241 ioctl 40046207 0 returned -16 netlink: 2 bytes leftover after parsing attributes in process `syz-executor1'. kauditd_printk_skb: 20 callbacks suppressed audit: type=1400 audit(1513375088.519:909): avc: denied { prog_load } for pid=12252 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 print_req_error: 43 callbacks suppressed print_req_error: I/O error, dev loop6, sector 0 print_req_error: I/O error, dev loop6, sector 0 buffer_io_error: 42 callbacks suppressed Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read Buffer I/O error on dev loop6, logical block 0, async page read audit: type=1400 audit(1513375088.526:910): avc: denied { prog_run } for pid=12252 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 audit: type=1400 audit(1513375088.557:911): avc: denied { map_create } for pid=12272 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. audit: type=1326 audit(1513375088.975:912): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12329 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513375088.975:913): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12329 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513375088.976:914): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12329 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=297 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513375088.976:915): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12329 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513375088.976:916): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12329 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513375088.978:917): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12329 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=41 compat=0 ip=0x452a39 code=0x7ffc0000 audit: type=1326 audit(1513375088.984:918): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=12329 comm="syz-executor2" exe="/root/syz-executor2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0x7ffc0000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. Started in network mode Own node address <64.888.2950>, network identity 4711 netlink: 17 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 14 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 14 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor2': attribute type 2 has an invalid length. rfkill: input handler disabled netlink: 'syz-executor2': attribute type 2 has an invalid length. rfkill: input handler enabled mmap: syz-executor6 (12543): VmData 15966208 exceed data ulimit 4. Update limits or use boot option ignore_rlimit_data. device eql entered promiscuous mode RDS: rds_bind could not find a transport for 172.20.1.187, load rds_tcp or rds_rdma? binder: 12678:12680 BC_DEAD_BINDER_DONE 0000000000000003 not found binder: 12678:12680 got transaction with invalid parent offset or type binder: 12678:12680 transaction failed 29201/-22, size 32-16 line 3013 binder: 12678:12680 transaction failed 29201/-22, size 0-0 line 2890 binder_alloc: binder_alloc_mmap_handler: 12678 20265000-20279000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 12678:12680 ioctl 40046207 0 returned -16 binder: 12678:12686 BC_DEAD_BINDER_DONE 0000000000000003 not found kvm_hv_set_msr: 246 callbacks suppressed kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008f data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008e data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008d data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008c data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008b data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x4000008a data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000089 data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000088 data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000087 data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000086 data 0xe0050031 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000020 data 0xe0050031 binder_alloc: 12678: binder_alloc_buf, no vma binder: 12678:12680 transaction failed 29189/-3, size 0-0 line 2890 binder_alloc: 12678: binder_alloc_buf, no vma binder: 12678:12686 transaction failed 29189/-3, size 32-16 line 2890 kvm [12684]: vcpu0, guest rIP: 0x9115 Hyper-V uhandled wrmsr: 0x40000020 data 0xe0050031 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29201 dccp_close: ABORT with 11 bytes unread semctl(GETNCNT/GETZCNT) is since 3.16 Single Unix Specification compliant. The task syz-executor4 (12996) triggered the difference, watch for misbehavior. netlink: 'syz-executor1': attribute type 5 has an invalid length. device gre0 entered promiscuous mode SELinux: unrecognized netlink message: protocol=0 nlmsg_type=213 sclass=netlink_route_socket pig=13373 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=213 sclass=netlink_route_socket pig=13387 comm=syz-executor3 kauditd_printk_skb: 215 callbacks suppressed audit: type=1400 audit(1513375094.026:1134): avc: denied { map } for pid=13401 comm="syz-executor1" path="socket:[44945]" dev="sockfs" ino=44945 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=packet_socket permissive=1 binder: 13449:13452 DecRefs 0 refcount change on invalid ref 2 ret -22 binder: 13449:13458 DecRefs 0 refcount change on invalid ref 2 ret -22 binder: 13402:13404 Acquire 1 refcount change on invalid ref 0 ret -22 binder: 13402:13404 Release 1 refcount change on invalid ref 0 ret -22 binder: 13402:13404 transaction failed 29189/-22, size 0-0 line 2775 binder: 13402:13404 Acquire 1 refcount change on invalid ref 0 ret -22 binder: 13402:13476 Release 1 refcount change on invalid ref 0 ret -22 binder: 13402:13476 transaction failed 29189/-22, size 0-0 line 2775 audit: type=1400 audit(1513375094.532:1135): avc: denied { map_read } for pid=13513 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 device gre0 entered promiscuous mode QAT: Invalid ioctl print_req_error: 96 callbacks suppressed print_req_error: I/O error, dev loop6, sector 0 print_req_error: I/O error, dev loop6, sector 0 buffer_io_error: 94 callbacks suppressed Buffer I/O error on dev loop6, logical block 0, async page read 9pnet_virtio: no channels available for device ./file0/file0 print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read print_req_error: I/O error, dev loop6, sector 0 Buffer I/O error on dev loop6, logical block 0, async page read Buffer I/O error on dev loop6, logical block 0, async page read nla_parse: 12 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor0'. audit: type=1400 audit(1513375095.085:1136): avc: denied { map } for pid=13640 comm="syz-executor4" path="socket:[46008]" dev="sockfs" ino=46008 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=udp_socket permissive=1 9pnet_virtio: no channels available for device ./file0/file0 netlink: 1 bytes leftover after parsing attributes in process `syz-executor0'.