binder: 5506:5507 ERROR: BC_REGISTER_LOOPER called without request binder: 5506:5507 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 =============================== [ INFO: suspicious RCU usage. ] 4.9.202+ #0 Not tainted ------------------------------- include/linux/radix-tree.h:199 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 0 2 locks held by syz-executor.5/5511: #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000006aa7d8a7>] inode_lock include/linux/fs.h:771 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000006aa7d8a7>] shmem_add_seals+0x166/0x1020 mm/shmem.c:2610 #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<000000004ac95ab8>] spin_lock_irq include/linux/spinlock.h:332 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<000000004ac95ab8>] shmem_tag_pins mm/shmem.c:2465 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<000000004ac95ab8>] shmem_wait_for_pins mm/shmem.c:2506 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<000000004ac95ab8>] shmem_add_seals+0x342/0x1020 mm/shmem.c:2622 stack backtrace: CPU: 0 PID: 5511 Comm: syz-executor.5 Not tainted 4.9.202+ #0 ffff8801cdf17ca0 ffffffff81b55d2b ffff8801ccddedd0 0000000000000000 0000000000000002 00000000000000c7 ffff88019cda2f80 ffff8801cdf17cd0 ffffffff81406867 ffffea0006ebc2c0 dffffc0000000000 ffff8801cdf17d78 Call Trace: [<00000000c48fb09e>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000c48fb09e>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<000000004ca3a470>] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4458 [<0000000066e91071>] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline] [<0000000066e91071>] shmem_tag_pins mm/shmem.c:2467 [inline] [<0000000066e91071>] shmem_wait_for_pins mm/shmem.c:2506 [inline] [<0000000066e91071>] shmem_add_seals+0xa44/0x1020 mm/shmem.c:2622 [<00000000bc06428e>] shmem_fcntl+0xf7/0x130 mm/shmem.c:2657 [<000000008e0d43f5>] do_fcntl fs/fcntl.c:340 [inline] [<000000008e0d43f5>] SYSC_fcntl fs/fcntl.c:376 [inline] [<000000008e0d43f5>] SyS_fcntl+0x1d5/0xb50 fs/fcntl.c:361 [<0000000091e44b7c>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000c2cc2320>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb binder: 6000:6001 ERROR: BC_REGISTER_LOOPER called without request binder: 6000:6001 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 mmap: syz-executor.5 (6013) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.