netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. ====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc3+ #222 Not tainted ------------------------------------------------------ syz-executor7/7658 is trying to acquire lock: (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000b400417b>] get_online_cpus include/linux/cpu.h:117 [inline] (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000b400417b>] lru_add_drain_all+0xe/0x20 mm/swap.c:729 but task is already holding lock: (&sb->s_type->i_mutex_key#10){++++}, at: [<000000008bb85431>] inode_lock include/linux/fs.h:713 [inline] (&sb->s_type->i_mutex_key#10){++++}, at: [<000000008bb85431>] 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#10){++++}: 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 -> #5 (&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 -> #4 (sb_writers){.+.+}: spin_lock include/linux/spinlock.h:315 [inline] lockref_get+0x15/0x50 lib/lockref.c:49 dget include/linux/dcache.h:325 [inline] shmem_mknod+0x174/0x1b0 mm/shmem.c:3005 vfs_mknod+0x34f/0x6a0 fs/namei.c:3708 handle_create+0x17f/0x760 drivers/base/devtmpfs.c:211 handle drivers/base/devtmpfs.c:373 [inline] devtmpfsd+0x3b4/0x4b0 drivers/base/devtmpfs.c:399 -> #3 ((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 -> #2 (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 -> #1 (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 -> #0 (cpu_hotplug_lock.rw_sem){++++}: 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 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 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#10 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#10); lock(&pipe->mutex/1); lock(&sb->s_type->i_mutex_key#10); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 1 lock held by syz-executor7/7658: #0: (&sb->s_type->i_mutex_key#10){++++}, at: [<000000008bb85431>] inode_lock include/linux/fs.h:713 [inline] #0: (&sb->s_type->i_mutex_key#10){++++}, at: [<000000008bb85431>] shmem_add_seals+0x197/0x1060 mm/shmem.c:2768 stack backtrace: CPU: 0 PID: 7658 Comm: syz-executor7 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 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 RIP: 0033:0x452a39 RSP: 002b:00007fe8ac449c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 00007fe8ac44a700 RCX: 0000000000452a39 RDX: 000000000000000a RSI: 0000000000000409 RDI: 0000000000000014 RBP: 0000000000a6f880 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a6f7ff R14: 00007fe8ac44a9c0 R15: 0000000000000012 netlink: 2 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor6'. binder: 7715:7716 DecRefs 0 refcount change on invalid ref 2 ret -22 binder: 7715:7723 DecRefs 0 refcount change on invalid ref 2 ret -22 device gre0 entered promiscuous mode sg_write: data in/out 327644/32 bytes for SCSI command 0x4-- guessing data in; program syz-executor4 not setting count and/or reply_len properly device lo entered promiscuous mode device lo left promiscuous mode sg_write: data in/out 327644/32 bytes for SCSI command 0x4-- guessing data in; program syz-executor4 not setting count and/or reply_len properly device lo entered promiscuous mode device lo left promiscuous mode kauditd_printk_skb: 63 callbacks suppressed audit: type=1400 audit(1513342194.041:339): avc: denied { map } for pid=7863 comm="syz-executor3" path="/proc/429/auxv" dev="proc" ino=27918 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=file permissive=1 audit: type=1400 audit(1513342194.042:340): avc: denied { execute } for pid=7863 comm="syz-executor3" path="/proc/429/auxv" dev="proc" ino=27918 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=file permissive=1 device gre0 entered promiscuous mode device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode device lo left promiscuous mode print_req_error: 280 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: 275 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 device gre0 entered promiscuous mode audit: type=1400 audit(1513342195.377:341): avc: denied { ioctl } for pid=8168 comm="syz-executor4" path="socket:[29363]" dev="sockfs" ino=29363 ioctlcmd=0x8946 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_fib_lookup_socket permissive=1 audit: type=1400 audit(1513342195.417:342): avc: denied { setopt } for pid=8168 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_fib_lookup_socket permissive=1 audit: type=1400 audit(1513342195.431:343): avc: denied { read } for pid=8168 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_fib_lookup_socket permissive=1 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: failed to copy from user cfg_data. binder: 8594:8597 got reply transaction with no transaction stack binder: 8594:8597 transaction failed 29201/-71, size 0-1936206469 line 2690 binder: 8594:8617 BC_INCREFS_DONE u0000000000000000 node 25 cookie mismatch 0000000000000003 != 0000000000000000 binder: 8594:8617 got transaction to invalid handle binder: 8594:8617 transaction failed 29201/-22, size 0-8 line 2775 binder: 8594:8617 BC_CLEAR_DEATH_NOTIFICATION invalid ref 2 binder: 8594:8617 BC_FREE_BUFFER u0000000020000000 no match binder: 8594:8617 got transaction with fd, -1, but target does not allow fds binder: 8594:8617 transaction failed 29201/-1, size 48-32 line 2995 binder: 8594:8617 got reply transaction with no transaction stack binder: 8594:8617 transaction failed 29201/-71, size 0-1936206469 line 2690 binder: BINDER_SET_CONTEXT_MGR already set binder: 8594:8625 ioctl 40046207 0 returned -16 binder: 8617 RLIMIT_NICE not set binder: 8594:8625 BC_INCREFS_DONE u0000000000000000 no match binder: 8594:8625 got transaction to invalid handle binder: 8594:8625 transaction failed 29201/-22, size 0-8 line 2775 binder: 8594:8633 BC_CLEAR_DEATH_NOTIFICATION invalid ref 2 binder: 8594:8633 BC_FREE_BUFFER u0000000020000000 no match binder_alloc: 8594: binder_alloc_buf, no vma binder: 8594:8633 transaction failed 29189/-3, size 48-32 line 2890 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29201 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 audit: type=1400 audit(1513342198.357:344): avc: denied { map } for pid=8851 comm="syz-executor5" path="socket:[30319]" dev="sockfs" ino=30319 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=key_socket permissive=1 device syz6 entered promiscuous mode netlink: 'syz-executor5': attribute type 19 has an invalid length. netlink: 1 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 6 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 6 bytes leftover after parsing attributes in process `syz-executor5'. device gre0 entered promiscuous mode device gre0 entered promiscuous mode device gre0 entered promiscuous mode QAT: Invalid ioctl syz-executor5 (9298): /proc/9290/oom_adj is deprecated, please use /proc/9290/oom_score_adj instead. netlink: 'syz-executor2': attribute type 19 has an invalid length. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. QAT: Invalid ioctl netlink: 'syz-executor2': attribute type 19 has an invalid length. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor2': attribute type 19 has an invalid length. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'.