print_req_error: I/O error, dev loop3, sector 0 ================================ WARNING: inconsistent lock state 4.14.307-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.3/10541 [HC0[0]:SC1[1]:HE1:SE0] takes: (&(&local->client_conns_lock)->rlock){+.?.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] (&(&local->client_conns_lock)->rlock){+.?.}, at: [] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:905 [inline] (&(&local->client_conns_lock)->rlock){+.?.}, at: [] rxrpc_put_client_conn+0x661/0xac0 net/rxrpc/conn_client.c:957 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:306 [inline] rxrpc_connect_call+0x2bb/0x3e10 net/rxrpc/conn_client.c:692 rxrpc_new_client_call+0x8f4/0x1a10 net/rxrpc/call_object.c:276 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:531 [inline] rxrpc_do_sendmsg+0x8dc/0xfb0 net/rxrpc/sendmsg.c:583 rxrpc_sendmsg+0x3cf/0x5f0 net/rxrpc/af_rxrpc.c:543 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 irq event stamp: 2856 hardirqs last enabled at (2856): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (2856): [] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:192 hardirqs last disabled at (2855): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2855): [] _raw_spin_lock_irqsave+0x66/0xc0 kernel/locking/spinlock.c:160 softirqs last enabled at (0): [] copy_process.part.0+0x12d0/0x71c0 kernel/fork.c:1734 softirqs last disabled at (2673): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (2673): [] irq_exit+0x193/0x240 kernel/softirq.c:409 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&local->client_conns_lock)->rlock); lock(&(&local->client_conns_lock)->rlock); *** DEADLOCK *** 1 lock held by syz-executor.3/10541: #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 stack backtrace: CPU: 0 PID: 10541 Comm: syz-executor.3 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_usage_bug.cold+0x42e/0x570 kernel/locking/lockdep.c:2589 valid_state kernel/locking/lockdep.c:2602 [inline] mark_lock_irq kernel/locking/lockdep.c:2796 [inline] mark_lock+0xb4d/0x1050 kernel/locking/lockdep.c:3194 mark_irqflags kernel/locking/lockdep.c:3072 [inline] __lock_acquire+0xc81/0x3f20 kernel/locking/lockdep.c:3448 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:905 [inline] rxrpc_put_client_conn+0x661/0xac0 net/rxrpc/conn_client.c:957 rxrpc_put_connection net/rxrpc/ar-internal.h:862 [inline] rxrpc_rcu_destroy_call+0x83/0x190 net/rxrpc/call_object.c:653 __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:796 RIP: 0033:0x7fbda545a21d RSP: 002b:00007ffe5ac51890 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff10 RAX: 00007fbda4b8c5d0 RBX: 00007fbda4b8c4b8 RCX: ffffffff86ff6a28 RDX: ffffffff86ff6a28 RSI: 00007fbda4b8c4c0 RDI: ffffffff86ff6a28 RBP: 00007fbda4b8c478 R08: 00007fbda4b8c618 R09: 0000000052900435 R10: 00007ffe5ac51c50 R11: 0000000000000246 R12: 00007fbda4b8c470 R13: 00007fbda4b8c4b8 R14: 00007fbda4b8c468 R15: 0000000000000012 FAT-fs (loop3): Unrecognized mount option "ÿÿÿÿÿÿÿÿ184467440737095516150xffffffffffffffff" or missing value f2fs_msg: 2 callbacks suppressed F2FS-fs (loop5): Mismatch start address, segment0(512) cp_blkaddr(605) F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock BTRFS info (device loop1): enabling inode map caching BTRFS info (device loop1): force clearing of disk cache BTRFS info (device loop1): disabling free space tree F2FS-fs (loop5): Mismatch start address, segment0(512) cp_blkaddr(605) F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock BTRFS info (device loop1): has skinny extents BTRFS info (device loop1): clearing free space tree BTRFS info (device loop1): clearing 1 ro feature flag BTRFS info (device loop1): clearing 2 ro feature flag BTRFS info (device loop1): checking UUID tree BTRFS info (device loop1): enabling inode map caching BTRFS info (device loop1): force clearing of disk cache BTRFS info (device loop1): disabling free space tree BTRFS info (device loop1): has skinny extents hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 BTRFS info (device loop1): clearing free space tree BTRFS info (device loop1): clearing 1 ro feature flag BTRFS info (device loop1): clearing 2 ro feature flag hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 BTRFS info (device loop1): checking UUID tree hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: unknown main item tag 0x0 hid-generic 0000:0000:0000.0001: hidraw0: HID v0.00 Device [syz1] on syz1 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0002: hidraw0: HID v0.00 Device [syz1] on syz1 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: unknown main item tag 0x0 hid-generic 0000:0000:0000.0003: hidraw0: HID v0.00 Device [syz1] on syz1 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 BTRFS info (device loop1): enabling inode map caching BTRFS info (device loop1): force clearing of disk cache hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 BTRFS info (device loop1): disabling free space tree BTRFS info (device loop1): has skinny extents hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: hidraw0: HID v0.00 Device [syz1] on syz1 BTRFS info (device loop1): clearing free space tree BTRFS info (device loop1): clearing 1 ro feature flag BTRFS info (device loop1): clearing 2 ro feature flag BTRFS info (device loop1): checking UUID tree hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0005: hidraw0: HID v0.00 Device [syz1] on syz1 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 audit: type=1804 audit(1677501985.634:2): pid=10974 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir491015913/syzkaller.dKC53a/29/bus" dev="sda1" ino=14024 res=1 audit: type=1800 audit(1677501985.634:3): pid=10974 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=14024 res=0 EXT4-fs (loop1): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs (loop1): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 hid-generic 0000:0000:0000.0006: unknown main item tag 0x0 [EXT4 FS bs=4096, gc=1, bpg=32768, ipg=32, mo=9000e01c, mo2=0002] hid-generic 0000:0000:0000.0006: hidraw0: HID v0.00 Device [syz1] on syz1 EXT4-fs (loop1): orphan cleanup on readonly fs Quota error (device loop1): v2_read_header: Failed header read: expected=8 got=0 audit: type=1326 audit(1677501986.064:4): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=10983 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fbda54ad0f9 code=0x0 EXT4-fs warning (device loop1): ext4_enable_quotas:5780: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): Cannot turn on quotas: error -22 EXT4-fs (loop1): ext4_orphan_cleanup: deleting unreferenced inode 15 EXT4-fs warning (device loop1): ext4_update_dynamic_rev:793: updating to rev 1 because of new feature flag, running e2fsck is recommended EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs (loop1): 1 orphan inode deleted EXT4-fs (loop1): mounted filesystem without journal. Opts: data_err=ignore,data_err=abort,nodiscard,noblock_validity,,errors=continue EXT4-fs (loop1): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs (loop1): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected [EXT4 FS bs=4096, gc=1, bpg=32768, ipg=32, mo=9000e01c, mo2=0002] EXT4-fs (loop1): orphan cleanup on readonly fs Quota error (device loop1): v2_read_header: Failed header read: expected=8 got=0 EXT4-fs warning (device loop1): ext4_enable_quotas:5780: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. print_req_error: I/O error, dev loop0, sector 0 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) EXT4-fs (loop1): Cannot turn on quotas: error -22 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) EXT4-fs (loop1): ext4_orphan_cleanup: deleting unreferenced inode 15 EXT4-fs warning (device loop1): ext4_update_dynamic_rev:793: updating to rev 1 because of new feature flag, running e2fsck is recommended EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs (loop1): 1 orphan inode deleted EXT4-fs (loop1): mounted filesystem without journal. Opts: data_err=ignore,data_err=abort,nodiscard,noblock_validity,,errors=continue UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) EXT4-fs (loop1): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs (loop1): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) [EXT4 FS bs=4096, gc=1, bpg=32768, ipg=32, mo=9000e01c, mo2=0002] EXT4-fs (loop1): orphan cleanup on readonly fs Quota error (device loop1): v2_read_header: Failed header read: expected=8 got=0 EXT4-fs warning (device loop1): ext4_enable_quotas:5780: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) EXT4-fs (loop1): Cannot turn on quotas: error -22 EXT4-fs (loop1): ext4_orphan_cleanup: deleting unreferenced inode 15 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) overlayfs: statfs failed on 'file0' EXT4-fs warning (device loop1): ext4_update_dynamic_rev:793: updating to rev 1 because of new feature flag, running e2fsck is recommended EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 overlayfs: statfs failed on 'file0' EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs (loop1): 1 orphan inode deleted EXT4-fs (loop1): mounted filesystem without journal. Opts: data_err=ignore,data_err=abort,nodiscard,noblock_validity,,errors=continue UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) overlayfs: statfs failed on 'file0' EXT4-fs (loop1): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs (loop1): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock [EXT4 FS bs=4096, gc=1, bpg=32768, ipg=32, mo=9000e01c, mo2=0002] EXT4-fs (loop1): orphan cleanup on readonly fs Quota error (device loop1): v2_read_header: Failed header read: expected=8 got=0 EXT4-fs warning (device loop1): ext4_enable_quotas:5780: Failed to enable quota tracking (type=-1, err=-22). Please run e2fsck to fix. overlayfs: statfs failed on 'file0' EXT4-fs (loop1): Cannot turn on quotas: error -22 EXT4-fs (loop1): ext4_orphan_cleanup: deleting unreferenced inode 15 EXT4-fs warning (device loop1): ext4_update_dynamic_rev:793: updating to rev 1 because of new feature flag, running e2fsck is recommended EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 input: syz1 as /devices/virtual/input/input5 EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 EXT4-fs error (device loop1): ext4_xattr_inode_iget:386: comm syz-executor.1: inode #36: comm syz-executor.1: iget: illegal inode # EXT4-fs error (device loop1): ext4_xattr_inode_iget:389: comm syz-executor.1: error while reading EA inode 36 err=-117 EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:444: comm syz-executor.1: Invalid block bitmap block 0 in block_group 0 EXT4-fs error (device loop1) in ext4_free_blocks:5010: Corrupt filesystem EXT4-fs (loop1): 1 orphan inode deleted hub 9-0:1.0: USB hub found EXT4-fs (loop1): mounted filesystem without journal. Opts: data_err=ignore,data_err=abort,nodiscard,noblock_validity,,errors=continue hub 9-0:1.0: 8 ports detected UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) x_tables: ip_tables: ah match: only valid for protocol 51