flags: 0x2fffc0000000000() raw: 02fffc0000000000 ffffea00063bf408 ffff88021fffaef8 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 CPU: 1 PID: 4123 Comm: syz-executor3 Not tainted 4.19.0+ #200 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:942 [inline] RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2768 [inline] RIP: 0010:skb_release_data+0x6bd/0x880 net/core/skbuff.c:564 kobject: 'kvm' (0000000029221dfe): kobject_uevent_env Code: e8 98 49 7b fb 48 8b bd 10 ff ff ff e8 cc ca fe ff e9 16 fb ff ff e8 82 49 7b fb 48 c7 c6 c0 19 98 88 4c 89 ef e8 83 f9 ac fb <0f> 0b e8 6c 49 7b fb 4c 8d 6b ff e9 b0 fc ff ff e8 5e 49 7b fb 4c RSP: 0018:ffff8801bd2ff440 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea0006f26634 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81b06de9 RDI: ffffed0037a5fe79 RBP: ffff8801bd2ff560 R08: ffff88018a7d4600 R09: 0000000000000002 R10: 0000000000000000 R11: ffff88018a7d4600 R12: dffffc0000000000 R13: ffffea0006f26600 R14: ffff8801bfc17df0 R15: 0000000000000000 kobject: 'kvm' (0000000029221dfe): fill_kobj_path: path = '/devices/virtual/misc/kvm' FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000096fd900 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fbc20491000 CR3: 00000001d3388000 CR4: 00000000001426e0 Call Trace: kobject: 'kvm' (0000000029221dfe): kobject_uevent_env kobject: 'kvm' (0000000029221dfe): fill_kobj_path: path = '/devices/virtual/misc/kvm' skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb+0x15/0x20 net/core/skbuff.c:641 sk_wmem_free_skb include/net/sock.h:1447 [inline] tcp_write_queue_purge+0x2b6/0x8b0 net/ipv4/tcp.c:2520 tcp_v4_destroy_sock+0x169/0x990 net/ipv4/tcp_ipv4.c:1983 kobject: 'kvm' (0000000029221dfe): kobject_uevent_env inet_csk_destroy_sock+0x19f/0x440 net/ipv4/inet_connection_sock.c:838 tcp_close+0xba7/0x1300 net/ipv4/tcp.c:2477 kobject: 'kvm' (0000000029221dfe): fill_kobj_path: path = '/devices/virtual/misc/kvm' tls_sk_proto_close+0x7a4/0xbb0 net/tls/tls_main.c:313 kobject: 'kvm' (0000000029221dfe): kobject_uevent_env inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428 kobject: 'kvm' (0000000029221dfe): fill_kobj_path: path = '/devices/virtual/misc/kvm' __sock_release+0x1d9/0x250 net/socket.c:579 sock_release+0x17/0x20 net/socket.c:598 smc_release+0x1a8/0x730 net/smc/af_smc.c:148 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1141 __fput+0x385/0xa30 fs/file_table.c:278 kobject: 'loop1' (00000000d9c2e24e): kobject_uevent_env kobject: 'loop1' (00000000d9c2e24e): fill_kobj_path: path = '/devices/virtual/block/loop1' ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 kobject: 'loop4' (00000000b3de57b2): kobject_uevent_env kobject: 'loop4' (00000000b3de57b2): fill_kobj_path: path = '/devices/virtual/block/loop4' tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 kobject: 'loop2' (000000007eea84e0): kobject_uevent_env prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:341 [inline] do_fast_syscall_32+0xcd5/0xfb2 arch/x86/entry/common.c:397 kobject: 'loop2' (000000007eea84e0): fill_kobj_path: path = '/devices/virtual/block/loop2' entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fc8ca9 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:000000000845fdac EFLAGS: 00000216 ORIG_RAX: 0000000000000006 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000000 RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 kobject: 'loop2' (000000007eea84e0): kobject_uevent_env R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: kobject: 'loop2' (000000007eea84e0): fill_kobj_path: path = '/devices/virtual/block/loop2' ---[ end trace 3af839f3f91b8ac2 ]--- RIP: 0010:put_page_testzero include/linux/mm.h:519 [inline] RIP: 0010:put_page include/linux/mm.h:942 [inline] RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2768 [inline] RIP: 0010:skb_release_data+0x6bd/0x880 net/core/skbuff.c:564 Code: e8 98 49 7b fb 48 8b bd 10 ff ff ff e8 cc ca fe ff e9 16 fb ff ff e8 82 49 7b fb 48 c7 c6 c0 19 98 88 4c 89 ef e8 83 f9 ac fb <0f> 0b e8 6c 49 7b fb 4c 8d 6b ff e9 b0 fc ff ff e8 5e 49 7b fb 4c RSP: 0018:ffff8801bd2ff440 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea0006f26634 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81b06de9 RDI: ffffed0037a5fe79 RBP: ffff8801bd2ff560 R08: ffff88018a7d4600 R09: 0000000000000002 R10: 0000000000000000 R11: ffff88018a7d4600 R12: dffffc0000000000 R13: ffffea0006f26600 R14: ffff8801bfc17df0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000096fd900 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fbc20491000 CR3: 00000001d3388000 CR4: 00000000001426e0