=============================== [ 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.0/18300: #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<00000000e9a47b4e>] inode_lock include/linux/fs.h:771 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<00000000e9a47b4e>] shmem_add_seals+0x166/0x1020 mm/shmem.c:2610 #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000b321fe13>] spin_lock_irq include/linux/spinlock.h:332 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000b321fe13>] shmem_tag_pins mm/shmem.c:2465 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000b321fe13>] shmem_wait_for_pins mm/shmem.c:2506 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000b321fe13>] shmem_add_seals+0x342/0x1020 mm/shmem.c:2622 stack backtrace: CPU: 0 PID: 18300 Comm: syz-executor.0 Not tainted 4.9.202+ #0 ffff88019cab7ca0 ffffffff81b55d2b ffff8801b0ebe968 0000000000000000 0000000000000002 00000000000000c7 ffff8801ca680000 ffff88019cab7cd0 ffffffff81406867 ffffea00063afcc0 dffffc0000000000 ffff88019cab7d78 Call Trace: [<00000000302d5f48>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000302d5f48>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<00000000a0af0ec9>] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4458 [<000000001e9295ac>] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline] [<000000001e9295ac>] shmem_tag_pins mm/shmem.c:2467 [inline] [<000000001e9295ac>] shmem_wait_for_pins mm/shmem.c:2506 [inline] [<000000001e9295ac>] shmem_add_seals+0xa44/0x1020 mm/shmem.c:2622 [<00000000a83f5b28>] shmem_fcntl+0xf7/0x130 mm/shmem.c:2657 [<0000000006357ae2>] do_fcntl fs/fcntl.c:340 [inline] [<0000000006357ae2>] SYSC_fcntl fs/fcntl.c:376 [inline] [<0000000006357ae2>] SyS_fcntl+0x1d5/0xb50 fs/fcntl.c:361 [<00000000c08580fc>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000000bac9750>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb blk_update_request: I/O error, dev loop0, sector 128 audit_printk_skb: 54 callbacks suppressed audit: type=1400 audit(1574541926.824:2691): avc: denied { create } for pid=18383 comm="syz-executor.3" 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(1574541926.854:2692): avc: denied { write } for pid=18383 comm="syz-executor.3" 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(1574541926.874:2693): avc: denied { map_create } for pid=18388 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=bpf permissive=1 audit: type=1400 audit(1574541927.524:2694): avc: denied { create } for pid=18383 comm="syz-executor.3" 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(1574541927.544:2695): avc: denied { write } for pid=18383 comm="syz-executor.3" 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(1574541928.144:2696): avc: denied { create } for pid=18417 comm="syz-executor.3" 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(1574541928.314:2697): avc: denied { write } for pid=18417 comm="syz-executor.3" 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(1574541928.804:2698): avc: denied { create } for pid=18417 comm="syz-executor.3" 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(1574541932.604:2699): avc: denied { create } for pid=18476 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(1574541932.754:2700): avc: denied { write } for pid=18476 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(1574541932.964:2701): avc: denied { read } for pid=18476 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 device lo entered promiscuous mode