============================= 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.4/4988: #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<00000000f2f56953>] inode_lock include/linux/fs.h:724 [inline] #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [<00000000f2f56953>] shmem_add_seals+0x12b/0xf80 mm/shmem.c:2831 #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<0000000066a33391>] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<0000000066a33391>] shmem_tag_pins mm/shmem.c:2685 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<0000000066a33391>] shmem_wait_for_pins mm/shmem.c:2726 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [<0000000066a33391>] shmem_add_seals+0x2e1/0xf80 mm/shmem.c:2843 stack backtrace: CPU: 0 PID: 4988 Comm: syz-executor.4 Not tainted 4.14.154+ #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xe5/0x154 lib/dump_stack.c:58 radix_tree_deref_slot include/linux/radix-tree.h:238 [inline] shmem_tag_pins mm/shmem.c:2687 [inline] shmem_wait_for_pins mm/shmem.c:2726 [inline] shmem_add_seals+0x9d2/0xf80 mm/shmem.c:2843 shmem_fcntl+0xea/0x120 mm/shmem.c:2878 do_fcntl+0x5c8/0xd20 fs/fcntl.c:421 SYSC_fcntl fs/fcntl.c:463 [inline] SyS_fcntl+0xc6/0x100 fs/fcntl.c:448 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a639 RSP: 002b:00007fcc057ffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000008 RSI: 0000000000000409 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcc058006d4 R13: 00000000004c1068 R14: 00000000004d3c60 R15: 00000000ffffffff EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem audit: type=1326 audit(1574170965.761:39): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5014 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 netlink: 25 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1326 audit(1574170965.841:40): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5023 comm="syz-executor.4" exe="/root/syz-executor.4" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=5022 comm=syz-executor.3 print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop3): unable to read superblock print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop3): unable to read superblock EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem audit: type=1326 audit(1574170966.721:41): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5092 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 print_req_error: I/O error, dev loop7, sector 2 EXT4-fs (loop7): unable to read superblock EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop7): unable to read superblock EXT4-fs (loop3): unable to read superblock audit: type=1326 audit(1574170967.691:42): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5152 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 device ip6_vti0 left promiscuous mode EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop3): unable to read superblock EXT4-fs (loop3): unable to read superblock EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem audit: type=1326 audit(1574170968.551:43): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5249 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 EXT4-fs (loop1): VFS: Can't find ext4 filesystem print_req_error: 4 callbacks suppressed print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop3): unable to read superblock print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop3): unable to read superblock EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop3): unable to read superblock print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop3): unable to read superblock audit: type=1326 audit(1574170969.401:44): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5315 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop3): unable to read superblock audit: type=1326 audit(1574170970.251:45): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5382 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem audit: type=1326 audit(1574170970.421:46): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5409 comm="syz-executor.4" exe="/root/syz-executor.4" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop3): unable to read superblock print_req_error: I/O error, dev loop3, sector 2 EXT4-fs (loop3): unable to read superblock audit: type=1326 audit(1574170971.101:47): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=5457 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45d47a code=0x0 mmap: syz-executor.4 (5472) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem EXT4-fs (loop1): VFS: Can't find ext4 filesystem audit: type=1400 audit(1574170975.141:48): avc: denied { map } for pid=5739 comm="syz-executor.3" path=2F6D656D66643A08E107202864656C6574656429 dev="tmpfs" ino=15528 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:tmpfs_t:s0 tclass=file permissive=1