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: [<ffffffff8146dbde>] __rcu_reclaim kernel/rcu/rcu.h:185 [inline]
#0: (rcu_callback){....}, at: [<ffffffff8146dbde>] rcu_do_batch kernel/rcu/tree.c:2699 [inline]
#0: (rcu_callback){....}, at: [<ffffffff8146dbde>] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
#0: (rcu_callback){....}, at: [<ffffffff8146dbde>] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
#0: (rcu_callback){....}, at: [<ffffffff8146dbde>] rcu_process_callbacks+0x84e/0x1180 kernel/rcu/tree.c:2946
#1: (&(&inst->lock)->rlock){+.-.}, at: [<ffffffff85e4ca9f>] spin_lock_bh include/linux/spinlock.h:322 [inline]
#1: (&(&inst->lock)->rlock){+.-.}, at: [<ffffffff85e4ca9f>] 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:
<IRQ>
__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
</IRQ>
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