============================= WARNING: suspicious RCU usage 4.14.154+ #0 Not tainted ----------------------------- include/linux/radix-tree.h:238 suspicious rcu_dereference_check() usage! other info that might help us debug this: binder: 20425:20426 unknown command 1654497283 rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor.4/20424: #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<0000000030932e88>] inode_lock include/linux/fs.h:724 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<0000000030932e88>] shmem_add_seals+0x12b/0xf80 mm/shmem.c:2831 #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000f2b17519>] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000f2b17519>] shmem_tag_pins mm/shmem.c:2685 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000f2b17519>] shmem_wait_for_pins mm/shmem.c:2726 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000f2b17519>] shmem_add_seals+0x2e1/0xf80 mm/shmem.c:2843 stack backtrace: CPU: 0 PID: 20424 Comm: syz-executor.4 Not tainted 4.14.154+ #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xe5/0x154 lib/dump_stack.c:58 radix_tree_deref_slot include/linux/radix-tree.h:238 [inline] shmem_tag_pins mm/shmem.c:2687 [inline] shmem_wait_for_pins mm/shmem.c:2726 [inline] shmem_add_seals+0x9d2/0xf80 mm/shmem.c:2843 shmem_fcntl+0xea/0x120 mm/shmem.c:2878 do_fcntl+0x5c8/0xd20 fs/fcntl.c:421 SYSC_fcntl fs/fcntl.c:463 [inline] SyS_fcntl+0xc6/0x100 fs/fcntl.c:448 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a639 RSP: 002b:00007fac321eac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 000000000000000d RSI: 0000000000000409 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fac321eb6d4 R13: 00000000004c1068 R14: 00000000004d3c60 R15: 00000000ffffffff binder: 20425:20426 ioctl c0306201 200012c0 returned -22 binder: 20425:20437 ioctl 800454e0 20000000 returned -22 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=77 sclass=netlink_route_socket pig=20717 comm=syz-executor.0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=77 sclass=netlink_route_socket pig=20730 comm=syz-executor.0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. binder: 20724:20732 unknown command 1654497283 binder: 20724:20732 ioctl c0306201 200012c0 returned -22 binder: 20724:20744 ioctl 800454e0 20000000 returned -22 binder: 20724:20732 unknown command 1654497283 binder: 20724:20732 ioctl c0306201 200012c0 returned -22 binder: 20724:20741 ioctl 800454e0 20000000 returned -22 binder: 20765:20773 unknown command 1654497283 binder: 20765:20773 ioctl c0306201 200012c0 returned -22 binder: 20765:20790 ioctl 800454e0 20000000 returned -22 binder: 20765:20768 unknown command 1654497283 binder: 20765:20768 ioctl c0306201 200012c0 returned -22 binder: 20765:20768 ioctl 800454e0 20000000 returned -22 netlink: 104 bytes leftover after parsing attributes in process `syz-executor.4'. binder: 20819:20825 unknown command 1654497283 binder: 20819:20825 ioctl c0306201 200012c0 returned -22 netlink: 104 bytes leftover after parsing attributes in process `syz-executor.4'. binder: 20819:20862 ioctl 800454e0 20000000 returned -22 binder: 20871:20878 unknown command 1654497283 binder: 20871:20878 ioctl c0306201 200012c0 returned -22 binder: 20871:20896 ioctl 800454e0 20000000 returned -22 binder: 20910:20911 unknown command 1654497283 binder: 20910:20911 ioctl c0306201 200012c0 returned -22 binder: 20910:20911 ioctl 800454e0 20000000 returned -22 binder: 20910:20911 unknown command 1654497283 binder: 20910:20911 ioctl c0306201 200012c0 returned -22 binder: 20910:20911 ioctl 800454e0 20000000 returned -22 binder: 20920:20921 unknown command 1654497283 binder: 20920:20921 ioctl c0306201 200012c0 returned -22 binder: 20920:20960 ioctl 800454e0 20000000 returned -22 binder: 20920:20930 unknown command 1654497283 binder: 20920:20930 ioctl c0306201 200012c0 returned -22 binder: 20920:20952 ioctl 800454e0 20000000 returned -22