Hi, I've got the following error report while running the syzkaller fuzzer.
On commit 566cf877a1fcb6d6dc0126b076aad062054c2637 (4.10-rc6). The fuzzer hits this issue quite often, but I don't have a working reproducer. WARNING: CPU: 3 PID: 7091 at net/core/skbuff.c:4331 skb_try_coalesce+0x14b1/0x1f80 net/core/skbuff.c:4331 Kernel panic - not syncing: panic_on_warn set ... CPU: 3 PID: 7091 Comm: syz-executor4 Not tainted 4.10.0-rc6+ #116 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:15 [inline] dump_stack+0x292/0x398 lib/dump_stack.c:51 panic+0x1cb/0x3a9 kernel/panic.c:179 __warn+0x1c4/0x1e0 kernel/panic.c:539 warn_slowpath_null+0x2c/0x40 kernel/panic.c:582 skb_try_coalesce+0x14b1/0x1f80 net/core/skbuff.c:4331 tcp_try_coalesce+0x178/0x560 net/ipv4/tcp_input.c:4337 tcp_queue_rcv+0x13c/0x7a0 net/ipv4/tcp_input.c:4572 tcp_data_queue+0x97e/0x46b0 net/ipv4/tcp_input.c:4681 tcp_rcv_state_process+0xd92/0x42d0 net/ipv4/tcp_input.c:6130 tcp_v4_do_rcv+0x571/0x940 net/ipv4/tcp_ipv4.c:1426 sk_backlog_rcv include/net/sock.h:893 [inline] __release_sock+0x127/0x3a0 net/core/sock.c:2053 release_sock+0xa5/0x2b0 net/core/sock.c:2540 inet_shutdown+0x1a8/0x350 net/ipv4/af_inet.c:833 SYSC_shutdown net/socket.c:1840 [inline] SyS_shutdown+0x253/0x2f0 net/socket.c:1831 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x4457d9 RSP: 002b:00007f73b41a5b58 EFLAGS: 00000282 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004457d9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000005 RBP: 00000000006e2170 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000708000 R13: 0000000000000005 R14: 0000000000000029 R15: 000000000000003f Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..
