L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. ip_tables: iptables: counters copy to user failed while replacing table netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. ============================= WARNING: suspicious RCU usage 4.14.281-syzkaller #0 Not tainted ----------------------------- net/netfilter/nf_queue.c:244 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.1/10022: #0: (rcu_callback){....}, at: [] __rcu_reclaim kernel/rcu/rcu.h:185 [inline] #0: (rcu_callback){....}, at: [] rcu_do_batch kernel/rcu/tree.c:2699 [inline] #0: (rcu_callback){....}, at: [] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] #0: (rcu_callback){....}, at: [] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] #0: (rcu_callback){....}, at: [] rcu_process_callbacks+0x84e/0x1180 kernel/rcu/tree.c:2946 #1: (&(&inst->lock)->rlock){+.-.}, at: [] spin_lock_bh include/linux/spinlock.h:322 [inline] #1: (&(&inst->lock)->rlock){+.-.}, at: [] nfqnl_flush+0x2f/0x2a0 net/netfilter/nfnetlink_queue.c:232 stack backtrace: CPU: 0 PID: 10022 Comm: syz-executor.1 Not tainted 4.14.281-syzkaller #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+0x1b2/0x281 lib/dump_stack.c:58 nf_reinject+0x56e/0x700 net/netfilter/nf_queue.c:244 ip_tables: iptables: counters copy to user failed while replacing table nfqnl_flush+0x1ab/0x2a0 net/netfilter/nfnetlink_queue.c:237 instance_destroy_rcu+0x19/0x30 net/netfilter/nfnetlink_queue.c:171 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2699 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:kfree+0x15d/0x250 mm/slab.c:3816 RSP: 0018:ffff8880632c79f0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: 0000000000000282 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff8880ab7cb480 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88813fe744c0 R13: ffffffff82d9a7a1 R14: 0000000000000001 R15: dffffc0000000000 exit_sem+0xb51/0x1260 ipc/sem.c:2288 do_exit+0xa08/0x2850 kernel/exit.c:861 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f390c341109 RSP: 002b:00007f390acb6218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f390c453f68 RCX: 00007f390c341109 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f390c453f68 RBP: 00007f390c453f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f390c453f6c R13: 00007fffea36c62f R14: 00007f390acb6300 R15: 0000000000022000 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. ip_tables: iptables: counters copy to user failed while replacing table block nbd4: not configured, cannot reconfigure gfs2: can't find protocol dlm block nbd4: not configured, cannot reconfigure gfs2: can't find protocol dlm block nbd0: not configured, cannot reconfigure block nbd4: not configured, cannot reconfigure gfs2: can't find protocol dlm block nbd0: not configured, cannot reconfigure x_tables: ip6_tables: eui64 match: used from hooks INPUT/OUTPUT, but only valid from PREROUTING/INPUT/FORWARD block nbd4: not configured, cannot reconfigure gfs2: can't find protocol dlm block nbd5: not configured, cannot reconfigure block nbd0: not configured, cannot reconfigure x_tables: ip6_tables: eui64 match: used from hooks INPUT/OUTPUT, but only valid from PREROUTING/INPUT/FORWARD block nbd5: not configured, cannot reconfigure x_tables: ip6_tables: eui64 match: used from hooks INPUT/OUTPUT, but only valid from PREROUTING/INPUT/FORWARD block nbd5: not configured, cannot reconfigure x_tables: ip6_tables: eui64 match: used from hooks INPUT/OUTPUT, but only valid from PREROUTING/INPUT/FORWARD IPVS: ftp: loaded support on port[0] = 21 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 blktrace: Concurrent blktraces are not allowed on sg0 F2FS-fs (loop3): Mismatch start address, segment0(117441536) cp_blkaddr(1024) blktrace: Concurrent blktraces are not allowed on sg0 F2FS-fs (loop3): Can't find valid F2FS filesystem in 1th superblock blktrace: Concurrent blktraces are not allowed on sg0 F2FS-fs (loop3): Unable to read 2th superblock F2FS-fs (loop3): Mismatch start address, segment0(117441536) cp_blkaddr(1024) blktrace: Concurrent blktraces are not allowed on sg0 F2FS-fs (loop3): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop3): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop3): Can't find valid F2FS filesystem in 2th superblock F2FS-fs (loop3): Mismatch start address, segment0(117441536) cp_blkaddr(1024) F2FS-fs (loop3): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop3): Unable to read 2th superblock print_req_error: I/O error, dev loop3, sector 8 Buffer I/O error on dev loop3, logical block 1, async page read print_req_error: I/O error, dev loop1, sector 0