====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc2+ #215 Not tainted ------------------------------------------------------ syz-executor1/13263 is trying to acquire lock: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000b65f3bef>] inode_lock include/linux/fs.h:713 [inline] (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000b65f3bef>] generic_file_write_iter+0xdc/0x7a0 mm/filemap.c:3289 but task is already holding lock: (&pipe->mutex/1){+.+.}, at: [<00000000427e36d3>] pipe_lock_nested fs/pipe.c:67 [inline] (&pipe->mutex/1){+.+.}, at: [<00000000427e36d3>] pipe_lock fs/pipe.c:75 [inline] (&pipe->mutex/1){+.+.}, at: [<00000000427e36d3>] 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){.+.+}: spin_lock include/linux/spinlock.h:315 [inline] cache_grow_end.part.37+0x3a/0x180 mm/slab.c:2726 cache_grow_end mm/slab.c:2720 [inline] cache_alloc_refill mm/slab.c:3047 [inline] ____cache_alloc mm/slab.c:3120 [inline] __do_cache_alloc mm/slab.c:3342 [inline] slab_alloc mm/slab.c:3377 [inline] kmem_cache_alloc+0x433/0x760 mm/slab.c:3545 getname_kernel+0x54/0x340 fs/namei.c:218 kern_path_create+0x23/0x40 fs/namei.c:3666 handle_create+0xc0/0x760 drivers/base/devtmpfs.c:203 -> #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+0x6bc/0x74f init/main.c:690 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+0xa5/0x74f 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-executor1/13263: #0: (sb_writers#6){.+.+}, at: [<00000000ca7f99bb>] file_start_write include/linux/fs.h:2715 [inline] #0: (sb_writers#6){.+.+}, at: [<00000000ca7f99bb>] do_splice fs/splice.c:1146 [inline] #0: (sb_writers#6){.+.+}, at: [<00000000ca7f99bb>] SYSC_splice fs/splice.c:1402 [inline] #0: (sb_writers#6){.+.+}, at: [<00000000ca7f99bb>] SyS_splice+0x1117/0x1630 fs/splice.c:1382 #1: (&pipe->mutex/1){+.+.}, at: [<00000000427e36d3>] pipe_lock_nested fs/pipe.c:67 [inline] #1: (&pipe->mutex/1){+.+.}, at: [<00000000427e36d3>] pipe_lock fs/pipe.c:75 [inline] #1: (&pipe->mutex/1){+.+.}, at: [<00000000427e36d3>] pipe_wait+0x1e6/0x280 fs/pipe.c:123 stack backtrace: CPU: 0 PID: 13263 Comm: syz-executor1 Not tainted 4.15.0-rc2+ #215 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:00007f5044b51c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f5044b52700 RCX: 0000000000452a39 RDX: 0000000000000013 RSI: 0000000000000000 RDI: 0000000000000014 RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a6f7ff R14: 00007f5044b529c0 R15: 0000000000000000 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=514 sclass=netlink_xfrm_socket pig=13256 comm=syz-executor3 netlink: 1 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 'syz-executor7': attribute type 15 has an invalid length. QAT: Invalid ioctl QAT: Invalid ioctl netlink: 'syz-executor7': attribute type 15 has an invalid length. device gre0 entered promiscuous mode QAT: Invalid ioctl loop_reread_partitions: partition scan of loop4 () failed (rc=-13) binder: 13425:13440 BC_DEAD_BINDER_DONE 0000000000000000 not found binder: 13425:13440 got reply transaction with no transaction stack binder: 13425:13440 transaction failed 29201/-71, size 0-16 line 2690 loop: Write error at byte offset 0, length 4096. print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, lost async page write loop: Write error at byte offset 0, length 4096. print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, lost async page write loop: Write error at byte offset 4096, length 1024. print_req_error: I/O error, dev loop4, sector 8 Buffer I/O error on dev loop4, logical block 1, lost async page write binder: BINDER_SET_CONTEXT_MGR already set binder: 13425:13450 ioctl 40046207 0 returned -16 binder: 13450 RLIMIT_NICE not set binder: 13425:13450 BC_DEAD_BINDER_DONE 0000000000000000 not found binder: 13425:13450 got reply transaction with no transaction stack binder: 13425:13450 transaction failed 29201/-71, size 0-16 line 2690 binder: undelivered TRANSACTION_ERROR: 29201 binder: undelivered TRANSACTION_ERROR: 29201 binder: undelivered death notification, 0000000000000000 device gre0 entered promiscuous mode binder: 13601:13609 BC_CLEAR_DEATH_NOTIFICATION death notification not active netlink: 11 bytes leftover after parsing attributes in process `syz-executor2'. do_dccp_setsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app binder: 13601:13609 ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER binder: 13609 RLIMIT_NICE not set do_dccp_setsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app binder: BINDER_SET_CONTEXT_MGR already set netlink: 11 bytes leftover after parsing attributes in process `syz-executor2'. binder: 13601:13658 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 binder: 13601:13659 ERROR: BC_REGISTER_LOOPER called without request binder: 13659 RLIMIT_NICE not set binder: 13601:13644 ioctl 40046207 0 returned -16 netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'. device gre0 entered promiscuous mode netlink: 16 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor7'. binder: 13730:13738 BC_REQUEST_DEATH_NOTIFICATION invalid ref 1 device gre0 entered promiscuous mode binder: 13730:13738 got transaction to invalid handle netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. binder: 13730:13738 transaction failed 29201/-22, size 0-0 line 2775 netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. binder: 13730:13738 got transaction with invalid parent offset or type binder: 13730:13738 transaction failed 29201/-22, size 72-32 line 3075 netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. binder: BINDER_SET_CONTEXT_MGR already set binder: 13730:13738 ioctl 40046207 0 returned -16 netlink: 16 bytes leftover after parsing attributes in process `syz-executor7'. binder: 13730:13765 BC_REQUEST_DEATH_NOTIFICATION invalid ref 1 binder: 13730:13765 got transaction to invalid handle binder: 13730:13765 transaction failed 29201/-22, size 0-0 line 2775 binder_alloc: 13730: binder_alloc_buf, no vma binder: 13730:13767 transaction failed 29189/-3, size 72-32 line 2890 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12336 sclass=netlink_route_socket pig=13771 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12336 sclass=netlink_route_socket pig=13773 comm=syz-executor6 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl device gre0 entered promiscuous mode device gre0 entered promiscuous mode Bearer <> rejected, not supported in standalone mode Bearer <> rejected, not supported in standalone mode device gre0 entered promiscuous mode netlink: 'syz-executor1': attribute type 10 has an invalid length. kauditd_printk_skb: 10 callbacks suppressed audit: type=1400 audit(1512906866.122:1069): avc: denied { setpcap } for pid=14354 comm="syz-executor3" capability=8 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 netlink: 'syz-executor1': attribute type 10 has an invalid length. dccp_invalid_packet: pskb_may_pull failed device gre0 entered promiscuous mode sock: sock_set_timeout: `syz-executor0' (pid 14412) tries to set negative timeout dccp_invalid_packet: pskb_may_pull failed rfkill: input handler disabled rfkill: input handler enabled audit: type=1400 audit(1512906867.740:1070): avc: denied { net_bind_service } for pid=14593 comm="syz-executor1" capability=10 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 device gre0 entered promiscuous mode skbuff: bad partial csum: csum=65534/0 len=292 audit: type=1400 audit(1512906867.882:1071): avc: denied { setopt } for pid=14655 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 audit: type=1400 audit(1512906867.919:1072): avc: denied { ioctl } for pid=14655 comm="syz-executor4" path="socket:[48922]" dev="sockfs" ino=48922 ioctlcmd=0x89a1 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=1 nla_parse: 22 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. irq bypass consumer (token 0000000015ad93c3) registration fails: -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 14779:14788 ioctl 40046207 0 returned -16 netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable netlink: 5 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. device gre0 entered promiscuous mode device syz3 entered promiscuous mode netlink: 109 bytes leftover after parsing attributes in process `syz-executor4'. capability: warning: `syz-executor1' uses deprecated v2 capabilities in a way that may be insecure netlink: 5 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. device gre0 entered promiscuous mode netlink: 'syz-executor6': attribute type 20 has an invalid length. device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready netlink: 'syz-executor6': attribute type 20 has an invalid length. QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. dccp_invalid_packet: P.Data Offset(120) too large kvm [15019]: vcpu0, guest rIP: 0xfff0 unimplemented HWCR wrmsr: 0x7 binder: 15030:15032 transaction failed 29189/-22, size 0-0 line 2775 dccp_invalid_packet: P.Data Offset(120) too large binder: undelivered TRANSACTION_ERROR: 29189 kvm [15019]: vcpu0, guest rIP: 0xfff0 unimplemented HWCR wrmsr: 0x7 binder: 15030:15044 transaction failed 29189/-22, size 0-0 line 2775 binder: undelivered TRANSACTION_ERROR: 29189 audit: type=1326 audit(1512906869.849:1073): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=15060 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0xffff0000 audit: type=1326 audit(1512906869.962:1074): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=15060 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=c000003e syscall=202 compat=0 ip=0x452a39 code=0xffff0000 audit: type=1400 audit(1512906870.070:1075): avc: denied { dac_read_search } for pid=15111 comm="syz-executor3" capability=2 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0,c1 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0,c1 tclass=cap_userns permissive=1 audit: type=1400 audit(1512906870.122:1076): avc: denied { dyntransition } for pid=15111 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0,c1 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0,c1 tclass=process permissive=1 device gre0 entered promiscuous mode device gre0 left promiscuous mode device gre0 entered promiscuous mode binder: 15177:15178 transaction failed 29189/-22, size 64-48 line 2775 device gre0 entered promiscuous mode binder_alloc: binder_alloc_mmap_handler: 15177 20000000-20002000 already mapped failed -16 binder: 15177:15178 transaction failed 29189/-22, size 64-48 line 2775 binder: 15299:15300 DecRefs 0 refcount change on invalid ref 268435456 ret -22 binder: 15299:15300 Acquire 1 refcount change on invalid ref 0 ret -22 binder: 15299:15300 BC_INCREFS_DONE u0000000000000000 no match binder: 15299:15309 ERROR: BC_REGISTER_LOOPER called without request binder: 15299:15309 BC_INCREFS_DONE u0000000000000000 node 120 cookie mismatch 0000000000000002 != 0000000000000000 binder: 15299:15309 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 binder: 15299:15309 DecRefs 0 refcount change on invalid ref 4 ret -22 binder: 15299:15309 Release 1 refcount change on invalid ref 1 ret -22