============================= 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.5/10762: #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: 10762 Comm: syz-executor.5 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:00007fd87d8c3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000008 RSI: 0000000000000409 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd87d8c46d4 R13: 00000000004c1068 R14: 00000000004d3c60 R15: 00000000ffffffff audit: type=1326 audit(1574217015.090:160): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10758 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0xffff0000 audit: type=1804 audit(1574217015.130:161): pid=10766 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-testdir961464549/syzkaller.919g9M/20/bus" dev="sda1" ino=17121 res=1 audit: type=1804 audit(1574217015.310:162): pid=10800 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.4" name="/root/syzkaller-testdir683508987/syzkaller.irdztF/22/bus" dev="sda1" ino=17125 res=1 audit: type=1804 audit(1574217015.340:163): pid=10800 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.4" name="/root/syzkaller-testdir683508987/syzkaller.irdztF/22/bus" dev="sda1" ino=17125 res=1 audit: type=1804 audit(1574217015.340:164): pid=10800 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.4" name="/root/syzkaller-testdir683508987/syzkaller.irdztF/22/bus" dev="sda1" ino=17125 res=1 audit: type=1804 audit(1574217015.340:165): pid=10800 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.4" name="/root/syzkaller-testdir683508987/syzkaller.irdztF/22/bus" dev="sda1" ino=17125 res=1 audit: type=1804 audit(1574217015.340:166): pid=10806 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.4" name="/root/syzkaller-testdir683508987/syzkaller.irdztF/22/bus" dev="sda1" ino=17125 res=1 block nbd2: shutting down sockets audit: type=1326 audit(1574217015.680:167): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=10758 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0xffff0000 devpts: called with bogus options bond0: Error: Device is in use and cannot be enslaved bond0: Error: Device is in use and cannot be enslaved nla_parse: 40 callbacks suppressed netlink: 15 bytes leftover after parsing attributes in process `syz-executor.1'. audit: type=1400 audit(1574217020.930:168): avc: denied { create } for pid=10895 comm="syz-executor.4" 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 netlink: 15 bytes leftover after parsing attributes in process `syz-executor.1'. audit: type=1400 audit(1574217020.960:169): avc: denied { write } for pid=10895 comm="syz-executor.4" path="socket:[43484]" dev="sockfs" ino=43484 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 bond0: Error: Device is in use and cannot be enslaved netlink: 15 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 15 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. bond0: Releasing backup interface bond_slave_1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1400 audit(1574217024.080:170): avc: denied { bind } for pid=10952 comm="syz-executor.0" 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 bond0: Enslaving bond_slave_1 as an active interface with an up link overlayfs: failed to resolve './file1': -2 bond0: Releasing backup interface bond_slave_1 EXT4-fs (loop2): ext4_check_descriptors: Inode bitmap for group 0 overlaps block group descriptors EXT4-fs (loop2): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs (loop2): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop2): group descriptors corrupted!