------------[ cut here ]------------ page_counter underflow: -4294966213 nr_pages=4294967295 WARNING: CPU: 1 PID: 3684 at mm/page_counter.c:56 page_counter_cancel+0xcf/0xe0 mm/page_counter.c:56 Modules linked in: CPU: 1 PID: 3684 Comm: kworker/1:4 Not tainted 5.16.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events mptcp_worker RIP: 0010:page_counter_cancel+0xcf/0xe0 mm/page_counter.c:56 Code: c7 04 24 00 00 00 00 45 31 f6 eb 97 e8 1a 1a b5 ff 4c 89 ea 48 89 ee 48 c7 c7 e0 9e b8 89 c6 05 d9 f1 ba 0b 01 e8 c7 bc 3e 07 <0f> 0b eb a8 4c 89 e7 e8 c5 54 fb ff eb c7 0f 1f 00 41 56 41 55 49 RSP: 0018:ffffc90002c07918 EFLAGS: 00010082 RAX: 0000000000000000 RBX: ffff888031d8c120 RCX: 0000000000000000 RDX: ffff88802cd64040 RSI: ffffffff815e3a18 RDI: fffff52000580f15 RBP: ffffffff0000043b R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815dd7be R11: 0000000000000000 R12: ffff888031d8c120 R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4143080218 CR3: 0000000022c69000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: page_counter_uncharge+0x2e/0x60 mm/page_counter.c:160 drain_stock+0xc1/0x180 mm/memcontrol.c:2166 refill_stock+0x139/0x2f0 mm/memcontrol.c:2218 __sk_mem_reduce_allocated+0x24d/0x550 net/core/sock.c:2945 __mptcp_rmem_reclaim net/mptcp/protocol.c:167 [inline] __mptcp_mem_reclaim_partial+0x124/0x410 net/mptcp/protocol.c:975 mptcp_mem_reclaim_partial net/mptcp/protocol.c:982 [inline] mptcp_alloc_tx_skb net/mptcp/protocol.c:1212 [inline] mptcp_sendmsg_frag+0x18c6/0x2190 net/mptcp/protocol.c:1279 __mptcp_push_pending+0x232/0x7a0 net/mptcp/protocol.c:1545 mptcp_release_cb+0xfe/0x200 net/mptcp/protocol.c:2978 release_sock+0xb4/0x1b0 net/core/sock.c:3306 mptcp_worker+0x51e/0xc10 net/mptcp/protocol.c:2444 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295