IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 ptrace attach of "/root/syz-executor.3"[8269] was attempted by "/root/syz-executor.3"[8275] ptrace attach of "/root/syz-executor.5"[8279] was attempted by "/root/syz-executor.5"[8281] ============================= 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.2/8283: #0: (&sb->s_type->i_mutex_key#12){+.+.}, at: [] inode_lock include/linux/fs.h:718 [inline] #0: (&sb->s_type->i_mutex_key#12){+.+.}, at: [] shmem_add_seals+0x15e/0x1060 mm/shmem.c:2810 #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_tag_pins mm/shmem.c:2665 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_wait_for_pins mm/shmem.c:2706 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_add_seals+0x334/0x1060 mm/shmem.c:2822 stack backtrace: CPU: 1 PID: 8283 Comm: syz-executor.2 Not tainted 4.14.154 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:4665 radix_tree_deref_slot include/linux/radix-tree.h:238 [inline] radix_tree_deref_slot include/linux/radix-tree.h:236 [inline] shmem_tag_pins mm/shmem.c:2667 [inline] shmem_wait_for_pins mm/shmem.c:2706 [inline] shmem_add_seals+0x9e0/0x1060 mm/shmem.c:2822 shmem_fcntl+0xf7/0x130 mm/shmem.c:2857 do_fcntl+0x190/0xe10 fs/fcntl.c:421 SYSC_fcntl fs/fcntl.c:463 [inline] SyS_fcntl+0xd5/0x110 fs/fcntl.c:448 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a639 RSP: 002b:00007f07631f8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000008 RSI: 0000000000000409 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f07631f96d4 R13: 00000000004c1068 R14: 00000000004d3c60 R15: 00000000ffffffff syz-executor.4 uses obsolete (PF_INET,SOCK_PACKET) IPv4: Oversized IP packet from 127.0.0.1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 kvm [8556]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 kvm: emulating exchange as write kvm [8585]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 sg_write: data in/out 2097152/1 bytes for SCSI command 0x4-- guessing data in; program syz-executor.1 not setting count and/or reply_len properly Unknown ioctl 8837 kvm [8611]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 kvm [8627]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 EXT4-fs (loop1): Number of reserved GDT blocks insanely large: 12389 netlink: 44 bytes leftover after parsing attributes in process `syz-executor.4'. device 0 entered promiscuous mode netlink: 44 bytes leftover after parsing attributes in process `syz-executor.4'. kvm [8703]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 device 1 entered promiscuous mode block nbd4: Receive control failed (result -61) block nbd4: NBD_DISCONNECT net_ratelimit: 21 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 block nbd4: Send disconnect failed -22 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 block nbd4: shutting down sockets mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium kvm [8752]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 kvm [8750]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 block nbd4: Receive control failed (result -61) block nbd4: NBD_DISCONNECT block nbd4: Send disconnect failed -22 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium block nbd4: shutting down sockets protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kvm [8778]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 XFS (loop3): Invalid superblock magic number kvm [8796]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 ntfs: (device loop3): parse_options(): Unrecognized mount option f-ask. kvm [8808]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 ntfs: (device loop3): parse_options(): Unrecognized mount option disable_sparPµ. ntfs: (device loop3): parse_options(): Unrecognized mount option err_zone_multiplier. ntfs: (device loop3): parse_options(): The gid option requires an argument. ntfs: (device loop3): parse_options(): Unrecognized mount option f-ask. ntfs: (device loop3): parse_options(): Unrecognized mount option disable_sparPµ. ntfs: (device loop3): parse_options(): Unrecognized mount option err_zone_multiplier. ntfs: (device loop3): parse_options(): The gid option requires an argument. EXT4-fs (loop4): bad geometry: block count 1080 exceeds size of device (1 blocks) EXT4-fs (loop4): bad geometry: block count 1080 exceeds size of device (1 blocks) netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. loop4: p1 p4 loop4: partition table partially beyond EOD, truncated loop4: p1 size 1761609727 extends beyond EOD, truncated loop4: p4 start 1854537728 is beyond EOD, truncated bond0: Releasing backup interface bond_slave_1 bond0: Enslaving bond_slave_1 as an active interface with an up link bond0: Releasing backup interface bond_slave_1 bond0: Enslaving bond_slave_1 as an active interface with an up link audit: type=1804 audit(1574247035.527:67): pid=8975 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir851185080/syzkaller.xnT4Uk/27/bus" dev="sda1" ino=16840 res=1 selinux_nlmsg_perm: 2 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 kvm_set_msr_common: 3 callbacks suppressed kvm [9014]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8975 comm=syz-executor.1 audit: type=1804 audit(1574247036.327:68): pid=9032 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir851185080/syzkaller.xnT4Uk/27/bus" dev="sda1" ino=16840 res=1 kvm [9035]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 kvm [9045]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0