============================= 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.4/15140: #0: (&sb->s_type->i_mutex_key#12){+.+.}, at: [] inode_lock include/linux/fs.h:718 [inline] #0: (&sb->s_type->i_mutex_key#12){+.+.}, at: [] shmem_add_seals+0x15e/0x1060 mm/shmem.c:2810 #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_tag_pins mm/shmem.c:2665 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_wait_for_pins mm/shmem.c:2706 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_add_seals+0x334/0x1060 mm/shmem.c:2822 stack backtrace: CPU: 0 PID: 15140 Comm: syz-executor.4 Not tainted 4.14.154 #0 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+0x142/0x197 lib/dump_stack.c:58 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:4665 radix_tree_deref_slot include/linux/radix-tree.h:238 [inline] radix_tree_deref_slot include/linux/radix-tree.h:236 [inline] shmem_tag_pins mm/shmem.c:2667 [inline] shmem_wait_for_pins mm/shmem.c:2706 [inline] shmem_add_seals+0x9e0/0x1060 mm/shmem.c:2822 shmem_fcntl+0xf7/0x130 mm/shmem.c:2857 do_fcntl+0x190/0xe10 fs/fcntl.c:421 SYSC_fcntl fs/fcntl.c:463 [inline] SyS_fcntl+0xd5/0x110 fs/fcntl.c:448 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a639 RSP: 002b:00007f2c85025c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 000000000000000d RSI: 0000000000000409 RDI: 0000000000000007 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2c850266d4 R13: 00000000004c1068 R14: 00000000004d3c60 R15: 00000000ffffffff protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 audit: type=1804 audit(1574133750.805:254): pid=15127 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir015242140/syzkaller.MubJI1/339/bus" dev="sda1" ino=17941 res=1 audit: type=1804 audit(1574133750.825:255): pid=15127 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir015242140/syzkaller.MubJI1/339/bus" dev="sda1" ino=17941 res=1 ptrace attach of "/root/syz-executor.1"[15366] was attempted by "/root/syz-executor.1"[15368] audit: type=1400 audit(1574133753.775:256): avc: denied { map } for pid=15396 comm="syz-executor.0" path="/root/syzkaller-testdir747122469/syzkaller.5PEWnU/261/file0/bus" dev="ramfs" ino=55065 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:ramfs_t:s0 tclass=file permissive=1 net_ratelimit: 14 callbacks suppressed A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check. selinux_nlmsg_perm: 2499 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15420 comm=syz-executor.2 ptrace attach of "/root/syz-executor.2"[15476] was attempted by "/root/syz-executor.2"[15478] ptrace attach of "/root/syz-executor.1"[15483] was attempted by "/root/syz-executor.1"[15487] protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 ptrace attach of "/root/syz-executor.2"[15518] was attempted by "/root/syz-executor.2"[15521] protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 IPVS: ftp: loaded support on port[0] = 21 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 binder: BINDER_SET_CONTEXT_MGR already set binder: 15528:15543 ioctl 40046207 0 returned -16 ptrace attach of "/root/syz-executor.1"[15633] was attempted by "/root/syz-executor.1"[15634] syz-executor.1 (15641) used greatest stack depth: 24192 bytes left nla_parse: 2 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. audit: type=1400 audit(1574133757.545:257): avc: denied { ioctl } for pid=15659 comm="syz-executor.1" path="socket:[55535]" dev="sockfs" ino=55535 ioctlcmd=0x8935 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. SELinux: Context system_u:object_r:var_spool_t:s0: is not valid (left unmapped). audit: type=1400 audit(1574133758.535:258): avc: denied { relabelto } for pid=15729 comm="syz-executor.2" name="UDP-Lite" dev="sockfs" ino=55621 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=rawip_socket permissive=1 ptrace attach of "/root/syz-executor.3"[15756] was attempted by "/root/syz-executor.3"[15759] input: syz1 as /devices/virtual/input/input24 input: syz1 as /devices/virtual/input/input25 net_ratelimit: 8 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 ptrace attach of "/root/syz-executor.3"[15851] was attempted by "/root/syz-executor.3"[15853] protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 selinux_nlmsg_perm: 5 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12297 sclass=netlink_route_socket pig=15864 comm=syz-executor.2 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 ptrace attach of "/root/syz-executor.0"[15881] was attempted by "/root/syz-executor.0"[15882] netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 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 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12297 sclass=netlink_route_socket pig=15914 comm=syz-executor.2 ptrace attach of "/root/syz-executor.1"[15930] was attempted by "/root/syz-executor.1"[15931]