general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 16619 Comm: syz-executor.4 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:flush_gro_hash net/core/dev.c:6980 [inline] RIP: 0010:__netif_napi_del.part.0+0x297/0x520 net/core/dev.c:6996 Code: 4d 63 e6 49 83 fc 07 0f 87 eb 01 00 00 48 89 e8 48 c1 e8 03 42 80 3c 28 00 0f 85 ae 01 00 00 4c 8b 7d 00 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 8b 01 00 00 49 83 fc 07 49 8b 1f 0f 87 6a 01 RSP: 0018:ffffc9000b2e79e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffe8ffff71f918 RCX: ffffc90012175000 RDX: 0000000000040000 RSI: ffffffff8729edad RDI: 0000000000000000 RBP: ffffe8ffff61f7f8 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8729ec63 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007feb34157700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055cec49c7af8 CR3: 000000007f4b0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __netif_napi_del+0x3c/0x50 net/core/dev.c:6989 gro_cells_destroy net/core/gro_cells.c:102 [inline] gro_cells_destroy+0x115/0x360 net/core/gro_cells.c:92 ip_tunnel_dev_free+0x15/0x60 net/ipv4/ip_tunnel.c:1010 netdev_run_todo+0x6b4/0xa80 net/core/dev.c:10627 ip_tunnel_delete_nets+0x3a4/0x5b0 net/ipv4/ip_tunnel.c:1124 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171 setup_net+0x639/0xa30 net/core/net_namespace.c:349 copy_net_ns+0x318/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3075 __do_sys_unshare kernel/fork.c:3146 [inline] __se_sys_unshare kernel/fork.c:3144 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3144 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7feb36c23ae9 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:00007feb34157188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007feb36d370e0 RCX: 00007feb36c23ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00007feb36c7df6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbff0a89f R14: 00007feb34157300 R15: 0000000000022000 Modules linked in: ---[ end trace 2c54c8c39a5ffc64 ]--- RIP: 0010:flush_gro_hash net/core/dev.c:6980 [inline] RIP: 0010:__netif_napi_del.part.0+0x297/0x520 net/core/dev.c:6996 Code: 4d 63 e6 49 83 fc 07 0f 87 eb 01 00 00 48 89 e8 48 c1 e8 03 42 80 3c 28 00 0f 85 ae 01 00 00 4c 8b 7d 00 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 8b 01 00 00 49 83 fc 07 49 8b 1f 0f 87 6a 01 RSP: 0018:ffffc9000b2e79e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffe8ffff71f918 RCX: ffffc90012175000 RDX: 0000000000040000 RSI: ffffffff8729edad RDI: 0000000000000000 RBP: ffffe8ffff61f7f8 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8729ec63 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007feb34157700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055cec49c6ae8 CR3: 000000007f4b0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 4d 63 e6 movslq %r14d,%r12 3: 49 83 fc 07 cmp $0x7,%r12 7: 0f 87 eb 01 00 00 ja 0x1f8 d: 48 89 e8 mov %rbp,%rax 10: 48 c1 e8 03 shr $0x3,%rax 14: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 19: 0f 85 ae 01 00 00 jne 0x1cd 1f: 4c 8b 7d 00 mov 0x0(%rbp),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 0f 85 8b 01 00 00 jne 0x1c0 35: 49 83 fc 07 cmp $0x7,%r12 39: 49 8b 1f mov (%r15),%rbx 3c: 0f .byte 0xf 3d: 87 6a 01 xchg %ebp,0x1(%rdx)