=============================== [ 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.2/13234: #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<0000000058cf7ea2>] inode_lock include/linux/fs.h:771 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<0000000058cf7ea2>] shmem_add_seals+0x166/0x1020 mm/shmem.c:2610 #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000f87d80ca>] spin_lock_irq include/linux/spinlock.h:332 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000f87d80ca>] shmem_tag_pins mm/shmem.c:2465 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000f87d80ca>] shmem_wait_for_pins mm/shmem.c:2506 [inline] #1: (&(&mapping->tree_lock)->rlock){..-...}, at: [<00000000f87d80ca>] shmem_add_seals+0x342/0x1020 mm/shmem.c:2622 stack backtrace: CPU: 1 PID: 13234 Comm: syz-executor.2 Not tainted 4.9.202+ #0 ffff88019c087ca0 ffffffff81b55d2b ffff8801b05d39e8 0000000000000000 0000000000000002 00000000000000c7 ffff8801d53fdf00 ffff88019c087cd0 ffffffff81406867 ffffea0007087b40 dffffc0000000000 ffff88019c087d78 Call Trace: [<00000000a9e23f69>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000a9e23f69>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<0000000058d46b30>] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4458 [<0000000064497f38>] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline] [<0000000064497f38>] shmem_tag_pins mm/shmem.c:2467 [inline] [<0000000064497f38>] shmem_wait_for_pins mm/shmem.c:2506 [inline] [<0000000064497f38>] shmem_add_seals+0xa44/0x1020 mm/shmem.c:2622 [<0000000094802fa7>] shmem_fcntl+0xf7/0x130 mm/shmem.c:2657 [<0000000052fb4962>] do_fcntl fs/fcntl.c:340 [inline] [<0000000052fb4962>] SYSC_fcntl fs/fcntl.c:376 [inline] [<0000000052fb4962>] SyS_fcntl+0x1d5/0xb50 fs/fcntl.c:361 [<000000003d343804>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000a0db5aee>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb audit: type=1400 audit(1574661047.571:680): avc: denied { create } for pid=13269 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(1574661047.761:681): avc: denied { write } for pid=13269 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(1574661047.951:682): avc: denied { set_context_mgr } for pid=13289 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=binder permissive=1 binder: BINDER_SET_CONTEXT_MGR already set binder: 13289:13300 ioctl 40046207 0 returned -16 audit: type=1400 audit(1574661048.211:683): avc: denied { create } for pid=13269 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(1574661048.211:684): avc: denied { write } for pid=13269 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(1574661048.451:685): avc: denied { syslog } for pid=13312 comm="syz-executor.2" capability=34 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=capability2 permissive=1 audit: type=1400 audit(1574661048.531:686): avc: denied { create } for pid=13319 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(1574661048.531:687): avc: denied { create } for pid=13318 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_generic_socket permissive=1 audit: type=1400 audit(1574661048.541:688): avc: denied { write } for pid=13318 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_generic_socket permissive=1 audit: type=1400 audit(1574661048.561:689): avc: denied { write } for pid=13319 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(1574661048.701:690): avc: denied { read } for pid=13318 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_generic_socket permissive=1 device nr0 entered promiscuous mode