flags: 0xfff00000000000() raw: 00fff00000000000 ffffea0001180c08 ffffea0000d56808 0000000000000000 raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:519! invalid opcode: 0000 [#1] PREEMPT SMP KASAN syz-executor.4 cpuset=/ mems_allowed=0-1 CPU: 0 PID: 16314 Comm: syz-executor.0 Not tainted 4.19.205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:put_page_testzero include/linux/mm.h:519 [inline] RIP: 0010:put_page include/linux/mm.h:962 [inline] RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2842 [inline] RIP: 0010:skb_release_data+0x3bf/0x920 net/core/skbuff.c:577 Code: cb 0a fb e9 2a fe ff ff e8 1e e9 f1 fa 48 8d 6b ff e9 b5 fe ff ff e8 10 e9 f1 fa 48 c7 c6 20 4b 4c 89 48 89 ef e8 61 72 19 fb <0f> 0b 4c 8b 34 24 e8 f6 e8 f1 fa 49 8d 7e 08 48 b8 00 00 00 00 00 RSP: 0018:ffff8880ba0075e8 EFLAGS: 00010206 CPU: 1 PID: 16325 Comm: syz-executor.4 Not tainted 4.19.205-syzkaller #0 RAX: ffff88804482c000 RBX: ffffea00011bf234 RCX: 0000000000000000 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RDX: 0000000000000100 RSI: ffffffff8670a9bf RDI: ffffea00011bf238 Call Trace: RBP: ffffea00011bf200 R08: 000000000000003e R09: 0000000000000000 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 warn_alloc.cold+0x7b/0x18f mm/page_alloc.c:3457 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888095ca8340 FS: 00007fda51612700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff6df6e168 CR3: 00000000b3c24000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 __vmalloc_node_range mm/vmalloc.c:1775 [inline] __vmalloc_node mm/vmalloc.c:1804 [inline] __vmalloc_node_flags mm/vmalloc.c:1818 [inline] vmalloc+0x15c/0x1a0 mm/vmalloc.c:1840 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 netlink_alloc_large_skb net/netlink/af_netlink.c:1197 [inline] netlink_sendmsg+0x483/0xc40 net/netlink/af_netlink.c:1886 Call Trace: skb_release_all net/core/skbuff.c:640 [inline] __kfree_skb+0x46/0x60 net/core/skbuff.c:654 sk_wmem_free_skb include/net/sock.h:1466 [inline] tcp_write_queue_purge+0x24d/0x800 net/ipv4/tcp.c:2543 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 tcp_reset+0xfe/0x490 net/ipv4/tcp_input.c:4081 sock_no_sendpage+0xf5/0x140 net/core/sock.c:2668 tcp_validate_incoming+0x117d/0x1670 net/ipv4/tcp_input.c:5452 tcp_rcv_state_process+0xb7a/0x4c50 net/ipv4/tcp_input.c:6092 kernel_sendpage net/socket.c:3581 [inline] sock_sendpage+0xdf/0x140 net/socket.c:912 pipe_to_sendpage+0x268/0x330 fs/splice.c:452 tcp_v6_do_rcv+0x47c/0x1370 net/ipv6/tcp_ipv6.c:1373 tcp_v6_rcv+0x26b8/0x3990 net/ipv6/tcp_ipv6.c:1577 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x389/0x800 fs/splice.c:627 ip6_input_finish+0x46a/0x17a0 net/ipv6/ip6_input.c:385 splice_from_pipe fs/splice.c:662 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:833 NF_HOOK include/linux/netfilter.h:289 [inline] ip6_input+0xcf/0x3c0 net/ipv6/ip6_input.c:428 do_splice_from fs/splice.c:852 [inline] do_splice fs/splice.c:1154 [inline] __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice+0xfe7/0x16d0 fs/splice.c:1408 dst_input include/net/dst.h:461 [inline] ip6_rcv_finish+0x1d9/0x2f0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0xf2/0x3f0 net/ipv6/ip6_input.c:273 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954 RSP: 002b:00007fe69f083188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007fe69f0831d0 R08: 0000001420000a77 R09: 0000000000000000 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 process_backlog+0x241/0x700 net/core/dev.c:5849 R13: 00007fff4640102f R14: 00007fe69f083300 R15: 0000000000022000 napi_poll net/core/dev.c:6280 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346 __do_softirq+0x265/0x980 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1092 do_softirq.part.0+0x160/0x1c0 kernel/softirq.c:336 do_softirq kernel/softirq.c:328 [inline] __local_bh_enable_ip+0x20e/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] inet_csk_listen_stop+0x1e7/0x8a0 net/ipv4/inet_connection_sock.c:1033 tcp_close+0xca3/0xfd0 net/ipv4/tcp.c:2351 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:472 __sock_release+0xcd/0x2a0 net/socket.c:599 Mem-Info: sock_close+0x15/0x20 net/socket.c:1212 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 active_anon:263427 inactive_anon:10482 isolated_anon:0 active_file:6418 inactive_file:47841 isolated_file:0 unevictable:0 dirty:251 writeback:0 unstable:0 slab_reclaimable:17785 slab_unreclaimable:137937 mapped:66115 shmem:10693 pagetables:1971 bounce:0 free:1145357 free_pcp:636 free_cma:0 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 Node 0 active_anon:1053708kB inactive_anon:41928kB active_file:25552kB inactive_file:191364kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:264460kB dirty:1000kB writeback:0kB shmem:42772kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 991232kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 Node 1 active_anon:0kB inactive_anon:0kB active_file:120kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:4kB writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 Node 0 DMA free:15908kB min:204kB low:252kB high:300kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 2693 2695 2695 2695 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Node 0 DMA32 free:527060kB min:35996kB low:44992kB high:53988kB active_anon:1053708kB inactive_anon:41928kB active_file:25552kB inactive_file:191364kB unevictable:0kB writepending:1000kB present:3129332kB managed:2763456kB mlocked:0kB kernel_stack:8896kB pagetables:7884kB bounce:0kB free_pcp:2524kB local_pcp:1224kB free_cma:0kB RIP: 0033:0x4665f9 lowmem_reserve[]: 0 0 1 1 1 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fda51612218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88 RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000 Node 0 Normal free:8kB min:24kB low:28kB high:32kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:1048576kB managed:2000kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c R13: 00007ffdf44fdf0f R14: 00007fda51612300 R15: 0000000000022000 Modules linked in: ---[ end trace c99a3e14ad31b157 ]--- RIP: 0010:put_page_testzero include/linux/mm.h:519 [inline] RIP: 0010:put_page include/linux/mm.h:962 [inline] RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2842 [inline] RIP: 0010:skb_release_data+0x3bf/0x920 net/core/skbuff.c:577 Code: cb 0a fb e9 2a fe ff ff e8 1e e9 f1 fa 48 8d 6b ff e9 b5 fe ff ff e8 10 e9 f1 fa 48 c7 c6 20 4b 4c 89 48 89 ef e8 61 72 19 fb <0f> 0b 4c 8b 34 24 e8 f6 e8 f1 fa 49 8d 7e 08 48 b8 00 00 00 00 00 RSP: 0018:ffff8880ba0075e8 EFLAGS: 00010206 RAX: ffff88804482c000 RBX: ffffea00011bf234 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff8670a9bf RDI: ffffea00011bf238 RBP: ffffea00011bf200 R08: 000000000000003e R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888095ca8340 FS: 00007fda51612700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff6df6e168 CR3: 00000000b3c24000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall * 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W