BUG: TASK stack guard page was hit at ffffc9000b3bfff8 (stack is ffffc9000b3c0000..ffffc9000b3c8000) stack guard page: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 23496 Comm: syz-executor.0 Not tainted 6.1.25-syzkaller-00021-g09e0f8509684 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 RIP: 0010:format_decode+0x77/0x1f10 lib/vsprintf.c:2508 Code: 41 48 c7 44 24 68 d9 c3 45 86 48 c7 44 24 70 10 df 00 85 4c 8d 74 24 60 49 c1 ee 03 48 b8 f1 f1 f1 f1 00 f3 f3 f3 49 89 04 1e 14 e1 72 fc 48 89 da 4c 89 f8 48 c1 e8 03 49 89 c5 80 3c 18 00 RSP: 0018:ffffc9000b3c0000 EFLAGS: 00010a06 RAX: f3f3f300f1f1f1f1 RBX: dffffc0000000000 RCX: ffffc9000b3c0268 RDX: ffffc9000b3c0270 RSI: ffffc9000b3c0180 RDI: ffffffff8569c840 RBP: ffffc9000b3c00f0 R08: ffffffff8500c3a4 R09: ffffc9000b3c0260 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000b3c0440 R13: dffffc0000000000 R14: 1ffff9200167800c R15: ffffc9000b3c0080 FS: 00007f756cdff700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc9000b3bfff8 CR3: 00000001628da000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vsnprintf+0x14d/0x1c70 lib/vsprintf.c:2752 sprintf+0xd6/0x120 lib/vsprintf.c:3004 print_time kernel/printk/printk.c:1276 [inline] info_print_prefix+0x167/0x300 kernel/printk/printk.c:1302 record_print_text+0x142/0x430 kernel/printk/printk.c:1351 console_emit_next_record+0x648/0xa70 kernel/printk/printk.c:2724 console_unlock+0x2c7/0x710 kernel/printk/printk.c:2870 vprintk_emit+0x141/0x440 kernel/printk/printk.c:2272 vprintk_default+0x26/0x30 kernel/printk/printk.c:2283 vprintk+0x86/0x90 kernel/printk/printk_safe.c:50 _printk+0xd1/0x111 kernel/printk/printk.c:2293 __dev_queue_xmit+0x1c1b/0x3660 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x7ac/0xaa0 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 sit_tunnel_xmit__ net/ipv6/sit.c:1057 [inline] sit_tunnel_xmit+0x94b/0x2510 net/ipv6/sit.c:1073 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x7ac/0xaa0 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 sit_tunnel_xmit__ net/ipv6/sit.c:1057 [inline] sit_tunnel_xmit+0x94b/0x2510 net/ipv6/sit.c:1073 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x7ac/0xaa0 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 sit_tunnel_xmit__ net/ipv6/sit.c:1057 [inline] sit_tunnel_xmit+0x94b/0x2510 net/ipv6/sit.c:1073 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x7ac/0xaa0 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 sit_tunnel_xmit__ net/ipv6/sit.c:1057 [inline] sit_tunnel_xmit+0x94b/0x2510 net/ipv6/sit.c:1073 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x525/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x218f/0x2ae0 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x7ac/0xaa0 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4904 [inline] netdev_start_xmit include/linux/netdevice.h:4918 [inline] xmit_one net/core/dev.c:3600 [inline] dev_hard_start_xmit+0x1de/0x630 net/core/dev.c:3616 __dev_queue_xmit+0x18c2/0x3660 net/core/dev.c:4266 dev_queue_xmit include/linux/netdevice.h:3072 [inline] neigh_connected_output+0x41b/0x4b0 net/core/neighbour.c:1612 neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xc00/0xf90 net/ipv4/ip_output.c:228 __ip_finish_output+0x162/0x370 ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_mc_output+0x3d4/0xa40 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] ip_send_skb net/ipv4/ip_output.c:1586 [inline] ip_push_pending_frames+0xf4/0x190 net/ipv4/ip_output.c:1606 raw_sendmsg+0x13f0/0x1e90 net/ipv4/raw.c:647 inet_sendmsg+0xa1/0xc0 net/ipv4/af_inet.c:828 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x5dc/0x9d0 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmmsg+0x3b9/0x6f0 net/socket.c:2622 __do_sys_sendmmsg net/socket.c:2651 [inline] __se_sys_sendmmsg net/socket.c:2648 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2648 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f756da8c199 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f756cdff168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f756dbabf80 RCX: 00007f756da8c199 RDX: 0000000000000300 RSI: 0000000020003380 RDI: 0000000000000003 RBP: 00007f756dae7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe529435ef R14: 00007f756cdff300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:format_decode+0x77/0x1f10 lib/vsprintf.c:2508 Code: 41 48 c7 44 24 68 d9 c3 45 86 48 c7 44 24 70 10 df 00 85 4c 8d 74 24 60 49 c1 ee 03 48 b8 f1 f1 f1 f1 00 f3 f3 f3 49 89 04 1e 14 e1 72 fc 48 89 da 4c 89 f8 48 c1 e8 03 49 89 c5 80 3c 18 00 RSP: 0018:ffffc9000b3c0000 EFLAGS: 00010a06 RAX: f3f3f300f1f1f1f1 RBX: dffffc0000000000 RCX: ffffc9000b3c0268 RDX: ffffc9000b3c0270 RSI: ffffc9000b3c0180 RDI: ffffffff8569c840 RBP: ffffc9000b3c00f0 R08: ffffffff8500c3a4 R09: ffffc9000b3c0260 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000b3c0440 R13: dffffc0000000000 R14: 1ffff9200167800c R15: ffffc9000b3c0080 FS: 00007f756cdff700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc9000b3bfff8 CR3: 00000001628da000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 rex.B 1: 48 c7 44 24 68 d9 c3 movq $0xffffffff8645c3d9,0x68(%rsp) 8: 45 86 a: 48 c7 44 24 70 10 df movq $0xffffffff8500df10,0x70(%rsp) 11: 00 85 13: 4c 8d 74 24 60 lea 0x60(%rsp),%r14 18: 49 c1 ee 03 shr $0x3,%r14 1c: 48 b8 f1 f1 f1 f1 00 movabs $0xf3f3f300f1f1f1f1,%rax 23: f3 f3 f3 26: 49 89 04 1e mov %rax,(%r14,%rbx,1) * 2a: e8 14 e1 72 fc callq 0xfc72e143 <-- trapping instruction 2f: 48 89 da mov %rbx,%rdx 32: 4c 89 f8 mov %r15,%rax 35: 48 c1 e8 03 shr $0x3,%rax 39: 49 89 c5 mov %rax,%r13 3c: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)