============================= 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: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor.5/6636: #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<00000000e09ec1e2>] inode_lock include/linux/fs.h:724 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<00000000e09ec1e2>] shmem_add_seals+0x12b/0xf80 mm/shmem.c:2831 #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000eefa67ca>] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000eefa67ca>] shmem_tag_pins mm/shmem.c:2685 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000eefa67ca>] shmem_wait_for_pins mm/shmem.c:2726 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<00000000eefa67ca>] shmem_add_seals+0x2e1/0xf80 mm/shmem.c:2843 stack backtrace: CPU: 0 PID: 6636 Comm: syz-executor.5 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:00007f0c38dd5c78 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: 00007f0c38dd66d4 R13: 00000000004c1068 R14: 00000000004d3c60 R15: 00000000ffffffff audit: type=1400 audit(2000000103.250:9374): avc: denied { connect } for pid=6688 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. PF_BRIDGE: RTM_DELNEIGH with unknown ifindex netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. PF_BRIDGE: RTM_DELNEIGH with invalid ifindex netlink: 232 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. selinux_nlmsg_perm: 551 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=24271 sclass=netlink_route_socket pig=6756 comm=syz-executor.0 IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready EXT4-fs (loop1): Unrecognized mount option "tes fG*Û" or missing value IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=6770 comm=syz-executor.5 IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready EXT4-fs (loop1): Unrecognized mount option "tes fG*Û" or missing value SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=6796 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3613 sclass=netlink_route_socket pig=6851 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3613 sclass=netlink_route_socket pig=6851 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3613 sclass=netlink_route_socket pig=6851 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3613 sclass=netlink_route_socket pig=6851 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3613 sclass=netlink_route_socket pig=6851 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3613 sclass=netlink_route_socket pig=6851 comm=syz-executor.4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3613 sclass=netlink_route_socket pig=6851 comm=syz-executor.4 PF_BRIDGE: RTM_DELNEIGH with invalid address PF_BRIDGE: RTM_DELNEIGH with invalid address