===================================================== BUG: KMSAN: uninit-value in __skb_checksum_complete+0x37f/0x540 net/core/skbuff.c:2850 CPU: 1 PID: 10784 Comm: syz-executor.4 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1df/0x240 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 __skb_checksum_complete+0x37f/0x540 net/core/skbuff.c:2850 nf_ip_checksum+0x53b/0x740 net/netfilter/utils.c:36 nf_nat_icmp_reply_translation+0x2ba/0x980 net/netfilter/nf_nat_proto.c:578 nf_nat_ipv4_fn net/netfilter/nf_nat_proto.c:637 [inline] nf_nat_ipv4_local_fn+0x215/0x830 net/netfilter/nf_nat_proto.c:708 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x16e/0x400 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] __ip_local_out+0x69b/0x800 net/ipv4/ip_output.c:114 ip_local_out net/ipv4/ip_output.c:123 [inline] ip_send_skb net/ipv4/ip_output.c:1560 [inline] ip_push_pending_frames+0x16f/0x460 net/ipv4/ip_output.c:1580 icmp_push_reply+0x660/0x710 net/ipv4/icmp.c:390 __icmp_send+0x23ca/0x3150 net/ipv4/icmp.c:740 ipv4_send_dest_unreach net/ipv4/route.c:1221 [inline] ipv4_link_failure+0x7be/0xb70 net/ipv4/route.c:1228 dst_link_failure include/net/dst.h:426 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:293 neigh_invalidate+0x33f/0x8c0 net/core/neighbour.c:993 neigh_timer_handler+0xb0b/0x1520 net/core/neighbour.c:1080 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd20/0x11c0 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x311/0x83d kernel/softirq.c:293 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:390 [inline] __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593 RIP: 0010:kmsan_slab_alloc+0xb4/0xe0 mm/kmsan/kmsan_hooks.c:83 Code: eb 0a ba 01 00 00 00 e8 1a ed ff ff be ff ff ff ff 65 0f c1 35 cd e0 51 6e ff ce 75 1c e8 44 6c 2e ff 4c 89 65 d8 ff 75 d8 9d <48> 83 c4 10 5b 41 5c 41 5e 41 5f 5d c3 0f 0b 48 c7 c7 ea 03 0a 9f RSP: 0018:ffffacba92a8f828 EFLAGS: 00000246 RAX: 43287f01cb6a8500 RBX: ffff9aba76b95640 RCX: 0000000000000033 RDX: 0000000000000032 RSI: 0000000000000000 RDI: ffff9aba76b95640 RBP: ffffacba92a8f858 R08: ffffede10000000f R09: ffff9aba2fffb000 R10: 000000000000000b R11: ffffffff9e60083d R12: 0000000000000246 R13: 0000000000000000 R14: 0000000000000cc0 R15: ffff9aba2f0eca80 slab_alloc_node mm/slub.c:2839 [inline] slab_alloc mm/slub.c:2848 [inline] kmem_cache_alloc+0x711/0xd70 mm/slub.c:2853 vm_area_dup kernel/fork.c:360 [inline] dup_mmap+0x912/0x1d20 kernel/fork.c:549 dup_mm+0x1f2/0x710 kernel/fork.c:1373 copy_mm kernel/fork.c:1429 [inline] copy_process+0x4bd8/0x9cb0 kernel/fork.c:2100 _do_fork+0x24f/0xfb0 kernel/fork.c:2445 __do_sys_clone kernel/fork.c:2601 [inline] __se_sys_clone+0x381/0x3d0 kernel/fork.c:2582 __x64_sys_clone+0x62/0x80 kernel/fork.c:2582 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45a80a Code: Bad RIP value. RSP: 002b:0000000000c9fd60 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000c9fd60 RCX: 000000000045a80a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000c9fda0 R08: 0000000000000001 R09: 0000000002a8e940 R10: 0000000002a8ec10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000c9fdf0 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 csum_partial_copy+0xae/0x100 lib/checksum.c:154 skb_copy_and_csum_bits+0x757/0x1130 net/core/skbuff.c:2766 icmp_glue_bits+0x166/0x380 net/ipv4/icmp.c:353 __ip_append_data+0x47c4/0x5630 net/ipv4/ip_output.c:1131 ip_append_data+0x328/0x480 net/ipv4/ip_output.c:1315 icmp_push_reply+0x206/0x710 net/ipv4/icmp.c:371 __icmp_send+0x23ca/0x3150 net/ipv4/icmp.c:740 ipv4_send_dest_unreach net/ipv4/route.c:1221 [inline] ipv4_link_failure+0x7be/0xb70 net/ipv4/route.c:1228 dst_link_failure include/net/dst.h:426 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:293 neigh_invalidate+0x33f/0x8c0 net/core/neighbour.c:993 neigh_timer_handler+0xb0b/0x1520 net/core/neighbour.c:1080 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd20/0x11c0 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x311/0x83d kernel/softirq.c:293 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline] kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:293 __alloc_pages_nodemask+0x56a2/0x5dc0 mm/page_alloc.c:4889 alloc_pages_current+0x672/0x990 mm/mempolicy.c:2292 alloc_pages include/linux/gfp.h:545 [inline] push_pipe+0x605/0xb70 lib/iov_iter.c:537 __pipe_get_pages lib/iov_iter.c:1278 [inline] pipe_get_pages_alloc lib/iov_iter.c:1385 [inline] iov_iter_get_pages_alloc+0x18a9/0x21c0 lib/iov_iter.c:1403 default_file_splice_read fs/splice.c:385 [inline] do_splice_to+0x4fc/0x14f0 fs/splice.c:871 splice_direct_to_actor+0x45c/0xf50 fs/splice.c:950 do_splice_direct+0x342/0x580 fs/splice.c:1059 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================