=============================== [ 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.3/32562: #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000000c78d419>] inode_lock include/linux/fs.h:771 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<000000000c78d419>] shmem_add_seals+0x166/0x1020 mm/shmem.c:2610 #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000ec98f7fa>] spin_lock_irq include/linux/spinlock.h:332 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000ec98f7fa>] shmem_tag_pins mm/shmem.c:2465 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000ec98f7fa>] shmem_wait_for_pins mm/shmem.c:2506 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000ec98f7fa>] shmem_add_seals+0x342/0x1020 mm/shmem.c:2622 stack backtrace: CPU: 1 PID: 32562 Comm: syz-executor.3 Not tainted 4.9.202+ #0 ffff88019e127ca0 ffffffff81b55d2b ffff8801c4769628 0000000000000000 0000000000000002 00000000000000c7 ffff8801d2c7af80 ffff88019e127cd0 ffffffff81406867 ffffea0006606d00 dffffc0000000000 ffff88019e127d78 Call Trace: [<00000000655fa263>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000655fa263>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<000000006eecc356>] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4458 [<00000000a4d4fbf1>] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline] [<00000000a4d4fbf1>] shmem_tag_pins mm/shmem.c:2467 [inline] [<00000000a4d4fbf1>] shmem_wait_for_pins mm/shmem.c:2506 [inline] [<00000000a4d4fbf1>] shmem_add_seals+0xa44/0x1020 mm/shmem.c:2622 [<00000000b0553e41>] shmem_fcntl+0xf7/0x130 mm/shmem.c:2657 [<000000008b7a3020>] do_fcntl fs/fcntl.c:340 [inline] [<000000008b7a3020>] SYSC_fcntl fs/fcntl.c:376 [inline] [<000000008b7a3020>] SyS_fcntl+0x1d5/0xb50 fs/fcntl.c:361 [<00000000fcaffc30>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<0000000091675175>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb audit: type=1400 audit(1574633773.952:909): avc: denied { create } for pid=32588 comm="syz-executor.2" 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 audit: type=1400 audit(1574633774.160:910): avc: denied { write } for pid=32588 comm="syz-executor.2" 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 audit: type=1400 audit(1574633775.548:911): avc: denied { create } for pid=32688 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_generic_socket permissive=1 audit: type=1400 audit(1574633775.717:912): avc: denied { write } for pid=32688 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_generic_socket permissive=1 audit: type=1400 audit(1574633775.905:913): avc: denied { create } for pid=32693 comm="syz-executor.2" 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 audit: type=1400 audit(1574633776.004:914): avc: denied { read } for pid=32688 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_generic_socket permissive=1 audit: type=1400 audit(1574633776.044:915): avc: denied { create } for pid=32688 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_generic_socket permissive=1 audit_printk_skb: 3 callbacks suppressed audit: type=1400 audit(1574633776.183:917): avc: denied { create } for pid=32693 comm="syz-executor.2" 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 audit: type=1400 audit(1574633776.223:918): avc: denied { connect } for pid=32693 comm="syz-executor.2" 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 audit: type=1400 audit(1574633779.892:919): avc: denied { create } for pid=32711 comm="syz-executor.5" 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 audit: type=1400 audit(1574633779.922:920): avc: denied { write } for pid=32711 comm="syz-executor.5" 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 audit: type=1400 audit(1574633779.961:921): avc: denied { read } for pid=32711 comm="syz-executor.5" 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 audit: type=1400 audit(1574633782.143:922): avc: denied { create } for pid=484 comm="syz-executor.5" 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 audit: type=1400 audit(1574633782.173:923): avc: denied { write } for pid=484 comm="syz-executor.5" 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 audit: type=1400 audit(1574633782.222:924): avc: denied { read } for pid=484 comm="syz-executor.5" 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 audit: type=1400 audit(1574633782.272:925): avc: denied { create } for pid=484 comm="syz-executor.5" 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 audit: type=1400 audit(1574633782.302:926): avc: denied { write } for pid=484 comm="syz-executor.5" 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 audit: type=1400 audit(1574633782.341:927): avc: denied { read } for pid=484 comm="syz-executor.5" 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