=============================== [ 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.4/10859: #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<00000000483b3803>] inode_lock include/linux/fs.h:771 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<00000000483b3803>] shmem_add_seals+0x166/0x1020 mm/shmem.c:2610 #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000bc1fa14e>] spin_lock_irq include/linux/spinlock.h:332 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000bc1fa14e>] shmem_tag_pins mm/shmem.c:2465 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000bc1fa14e>] shmem_wait_for_pins mm/shmem.c:2506 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000bc1fa14e>] shmem_add_seals+0x342/0x1020 mm/shmem.c:2622 stack backtrace: CPU: 1 PID: 10859 Comm: syz-executor.4 Not tainted 4.9.202+ #0 ffff8801a22ffca0 ffffffff81b55d2b ffff8801c40f6ee8 0000000000000000 0000000000000002 00000000000000c7 ffff8801c6fe2f80 ffff8801a22ffcd0 ffffffff81406867 ffffea00065b2b80 dffffc0000000000 ffff8801a22ffd78 Call Trace: [<000000005e4954a0>] __dump_stack lib/dump_stack.c:15 [inline] [<000000005e4954a0>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<0000000029d3f71b>] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4458 [<00000000762fd863>] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline] [<00000000762fd863>] shmem_tag_pins mm/shmem.c:2467 [inline] [<00000000762fd863>] shmem_wait_for_pins mm/shmem.c:2506 [inline] [<00000000762fd863>] shmem_add_seals+0xa44/0x1020 mm/shmem.c:2622 [<00000000c698449d>] shmem_fcntl+0xf7/0x130 mm/shmem.c:2657 [<0000000017833448>] do_fcntl fs/fcntl.c:340 [inline] [<0000000017833448>] SYSC_fcntl fs/fcntl.c:376 [inline] [<0000000017833448>] SyS_fcntl+0x1d5/0xb50 fs/fcntl.c:361 [<00000000f9df2e21>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000009e1a7706>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb audit: type=1400 audit(1574608853.652:283): avc: denied { create } for pid=10874 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_generic_socket permissive=1 audit: type=1400 audit(1574608853.682:284): avc: denied { write } for pid=10874 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_generic_socket permissive=1 audit: type=1400 audit(1574608853.722:285): avc: denied { read } for pid=10874 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_generic_socket permissive=1 audit: type=1400 audit(1574608859.022:286): avc: denied { create } for pid=11158 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(1574608859.952:287): avc: denied { create } for pid=11203 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(1574608860.232:288): avc: denied { create } for pid=11203 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(1574608860.512:289): avc: denied { create } for pid=11226 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(1574608860.732:290): avc: denied { create } for pid=11226 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