------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:2237!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 12423 Comm: syz-executor875 Not tainted 4.9.102-gc5aceac #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801a2f99800 task.stack: ffff8801a5d60000
RIP: 0010:[<ffffffff830363a0>]  [<ffffffff830363a0>] skb_copy_and_csum_bits+0x670/0x7a0 net/core/skbuff.c:2237
RSP: 0018:ffff8801db307238  EFLAGS: 00010206
RAX: ffff8801a2f99800 RBX: 000000001b3bcf37 RCX: 1ffff100357cdb29
RDX: 0000000000000100 RSI: ffffffff830363a0 RDI: ffff8801abe6d948
RBP: ffff8801db3072b8 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003c R11: ffff88019618475f R12: 0000000000000000
R13: 0000000000000224 R14: 0000000000000000 R15: ffff8801abe6d940
FS:  00007fca72dc4700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000209322d3 CR3: 00000001d9b39000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81298b23 ffff8801d4a95204 ffffffff839fe4bb ffffffff8114b0b7
 ffff8801d4a95208 ffff8801961844e8 1b3bcf370000003c 000001e80000003c
 0000003c0000003c ffff8801d4a95140 0000000000000000 ffff8801cd0ee300
Call Trace:
 [<ffffffff8340b7cf>] icmp_glue_bits+0x7f/0x1d0 net/ipv4/icmp.c:344
 [<ffffffff83334da5>] __ip_append_data.isra.49+0x1d15/0x2860 net/ipv4/ip_output.c:1079
 [<ffffffff833359d4>] ip_append_data.part.51+0xe4/0x150 net/ipv4/ip_output.c:1228
 [<ffffffff8333e428>] ip_append_data+0x68/0x80 net/ipv4/ip_output.c:1217
 [<ffffffff8340b3de>] icmp_push_reply+0x19e/0x510 net/ipv4/icmp.c:362
 [<ffffffff8340ff0a>] icmp_send+0xaca/0x1430 net/ipv4/icmp.c:727
 [<ffffffff8333993a>] ip_fragment.constprop.56+0x1aa/0x200 net/ipv4/ip_output.c:548
 [<ffffffff8333a0d1>] ip_finish_output+0x741/0xac0 net/ipv4/ip_output.c:311
 [<ffffffff8333e03d>] NF_HOOK_COND include/linux/netfilter.h:246 [inline]
 [<ffffffff8333e03d>] ip_output+0x1cd/0x550 net/ipv4/ip_output.c:401
 [<ffffffff8333aa9b>] dst_output include/net/dst.h:507 [inline]
 [<ffffffff8333aa9b>] ip_local_out+0x9b/0x180 net/ipv4/ip_output.c:124
 [<ffffffff8333be57>] ip_queue_xmit+0x897/0x1b60 net/ipv4/ip_output.c:500
 [<ffffffff833a3dac>] tcp_transmit_skb+0x168c/0x2e30 net/ipv4/tcp_output.c:1036
 [<ffffffff833ae1ce>] __tcp_retransmit_skb+0x42e/0x1cf0 net/ipv4/tcp_output.c:2749
 [<ffffffff833b02a9>] tcp_retransmit_skb+0x29/0x2a0 net/ipv4/tcp_output.c:2768
 [<ffffffff833b698a>] tcp_retransmit_timer+0x92a/0x2290 net/ipv4/tcp_timer.c:507
 [<ffffffff833b84e1>] tcp_write_timer_handler+0x1f1/0x7a0 net/ipv4/tcp_timer.c:591
 [<ffffffff833b8b52>] tcp_write_timer+0xc2/0x180 net/ipv4/tcp_timer.c:609
 [<ffffffff81298b23>] call_timer_fn+0x163/0x6e0 kernel/time/timer.c:1319
 [<ffffffff8129fc87>] expire_timers kernel/time/timer.c:1359 [inline]
 [<ffffffff8129fc87>] __run_timers kernel/time/timer.c:1658 [inline]
 [<ffffffff8129fc87>] run_timer_softirq+0x1047/0x1590 kernel/time/timer.c:1684
 [<ffffffff839fe4bb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b0b7>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff8114b0b7>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff839fd0a1>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff839fd0a1>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff839f9230>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> [  145.210943]  [<ffffffff814675eb>] ? constant_test_bit arch/x86/include/asm/bitops.h:311 [inline]
 <EOI> [  145.210943]  [<ffffffff814675eb>] ? PageReferenced include/linux/page-flags.h:257 [inline]
 <EOI> [  145.210943]  [<ffffffff814675eb>] ? mark_page_accessed+0x2ab/0x610 mm/swap.c:383
 [<ffffffff814bc17b>] follow_page_pte+0x52b/0xc90 mm/gup.c:173
 [<ffffffff814bce7f>] follow_page_mask+0x59f/0xf70 mm/gup.c:306
 [<ffffffff814bdd0d>] __get_user_pages+0x4bd/0x1180 mm/gup.c:585
 [<ffffffff814bf88a>] populate_vma_page_range+0x19a/0x230 mm/gup.c:1106
 [<ffffffff814bfb2b>] __mm_populate+0x20b/0x350 mm/gup.c:1156
 [<ffffffff81497ae5>] mm_populate include/linux/mm.h:2041 [inline]
 [<ffffffff81497ae5>] vm_mmap_pgoff+0x195/0x1b0 mm/util.c:333
 [<ffffffff814e0060>] SYSC_mmap_pgoff mm/mmap.c:1523 [inline]
 [<ffffffff814e0060>] SyS_mmap_pgoff+0xd0/0x550 mm/mmap.c:1481
 [<ffffffff8105e0f6>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:96 [inline]
 [<ffffffff8105e0f6>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:87
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f78d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 00 00 4d 8b 24 24 44 8b 6d d0 4d 85 e4 0f 85 30 ff ff ff 8b 5d b4 e8 10 88 32 fe 8b 45 bc 85 c0 0f 84 94 fe ff ff e8 00 88 32 fe <0f> 0b 8b 5d b4 e9 85 fe ff ff c7 45 b0 00 00 00 00 e9 b6 fa ff 
RIP  [<ffffffff830363a0>] skb_copy_and_csum_bits+0x670/0x7a0 net/core/skbuff.c:2237
 RSP <ffff8801db307238>
---[ end trace 748b9a9e4c22eaae ]---