syzbot

 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x142/0x197 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10f/0x159 lib/fault-inject.c:149
 should_failslab+0xdb/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node_trace+0x280/0x770 mm/slab.c:3659
------------[ cut here ]------------
WARNING: CPU: 0 PID: 11268 at fs/exportfs/expfs.c:96 clear_disconnected fs/exportfs/expfs.c:96 [inline]
WARNING: CPU: 0 PID: 11268 at fs/exportfs/expfs.c:96 reconnect_path+0x4a6/0x630 fs/exportfs/expfs.c:232
 __do_kmalloc_node mm/slab.c:3681 [inline]
 __kmalloc_node_track_caller+0x3d/0x80 mm/slab.c:3696
Kernel panic - not syncing: panic_on_warn set ...

 __kmalloc_reserve.isra.0+0x40/0xe0 net/core/skbuff.c:137
 __alloc_skb+0xcf/0x500 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:980 [inline]
 netlink_dump+0x235/0xb10 net/netlink/af_netlink.c:2183
 __netlink_dump_start+0x4ff/0x750 net/netlink/af_netlink.c:2299
 netlink_dump_start include/linux/netlink.h:217 [inline]
 rtnetlink_rcv_msg+0x5b9/0xb70 net/core/rtnetlink.c:4255
 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4297
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xb9/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2103
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a669
RSP: 002b:00007f8c715cbc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8c715cbc90 RCX: 000000000045a669
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8c715cc6d4
R13: 00000000004c847c R14: 00000000004de908 R15: 0000000000000004
CPU: 0 PID: 11268 Comm: syz-executor.4 Not tainted 4.14.154 #0
net_ratelimit: 14 callbacks suppressed
protocol 88fb is buggy, dev hsr_slave_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
 panic+0x1f9/0x42d kernel/panic.c:183
protocol 88fb is buggy, dev hsr_slave_1
 __warn.cold+0x2f/0x2f kernel/panic.c:547
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:clear_disconnected fs/exportfs/expfs.c:96 [inline]
RIP: 0010:reconnect_path+0x4a6/0x630 fs/exportfs/expfs.c:232
RSP: 0018:ffff88802b2bfbf0 EFLAGS: 00010246
kobject: 'loop5' (ffff8880a4b213a0): kobject_uevent_env
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc9000fa78000
kobject: 'loop5' (ffff8880a4b213a0): fill_kobj_path: path = '/devices/virtual/block/loop5'
RDX: 0000000000040000 RSI: ffffffff81f6b616 RDI: ffff888082a341e0
RBP: ffff88802b2bfc40 R08: ffff888038a78300 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888038a78300 R12: ffff888082a341a0
R13: dffffc0000000000 R14: ffff888082a341a0 R15: ffff88805f6f6420
 exportfs_decode_fh+0x3cc/0x5e2 fs/exportfs/expfs.c:448
 do_handle_to_path fs/fhandle.c:153 [inline]
 handle_to_path fs/fhandle.c:208 [inline]
 do_handle_open+0x285/0x640 fs/fhandle.c:224
 SYSC_open_by_handle_at fs/fhandle.c:266 [inline]
 SyS_open_by_handle_at+0x27/0x30 fs/fhandle.c:257
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a669
RSP: 002b:00007f9f58693c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00007f9f58693c90 RCX: 000000000045a669
RDX: 0000000000400000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9f586946d4
R13: 00000000004c731d R14: 00000000004dcd30 R15: 0000000000000003
Kernel Offset: disabled
Rebooting in 86400 seconds..