BUG: stack guard page was hit in sys_sendto

Status: upstream: reported on 2026/11/03 17:27
Reported-by: syzbot+efc6be23fe4cf33fce45@syzkaller.appspotmail.com
First crash: 8h58m, last: 8h58m
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: stack guard page was hit in sys_sendto mm -1 1 844d 844d 0/29 auto-obsoleted due to no activity on 2024/11/01 07:20

Sample crash report:
BUG: TASK stack guard page was hit at ffffc90003687ff8 (stack is ffffc90003688000..ffffc90003690000)
stack guard page: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 17632 Comm: syz.3.3384 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:check_preemption_disabled+0x5/0x110 lib/smp_processor_id.c:13
Code: a0 eb 32 8a e8 2c 01 00 00 65 ff 0d a1 b8 39 76 5b c3 00 00 cc 48 c7 c7 a0 50 7a 8a 48 c7 c6 e0 50 7a 8a eb 00 55 41 57 41 56 <53> 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 05
RSP: 0018:ffffc90003688000 EFLAGS: 00010046
RAX: 0000000000000004 RBX: ffffc90003688060 RCX: ffffffff9714df03
RDX: 0000000000000000 RSI: ffffffff8a2b3960 RDI: ffffffff8a7a5100
RBP: ffffc900036880d0 R08: dffffc0000000000 R09: 1ffffffff2208e18
R10: dffffc0000000000 R11: fffffbfff2208e19 R12: 3eac5b001efc8862
R13: ffff888061d3d940 R14: dffffc0000000000 R15: 1ffff920006d1004
FS:  00007f27399616c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003687ff8 CR3: 00000000622f8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lockdep_lock+0xbe/0x1f0 kernel/locking/lockdep.c:112
 graph_lock kernel/locking/lockdep.c:139 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3790 [inline]
 validate_chain kernel/locking/lockdep.c:3823 [inline]
 __lock_acquire+0x1499/0x7d40 kernel/locking/lockdep.c:5120
 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
 local_lock_acquire+0x2b/0x120 include/linux/local_lock_internal.h:29
 rmqueue_pcplist mm/page_alloc.c:3699 [inline]
 rmqueue mm/page_alloc.c:3742 [inline]
 get_page_from_freelist+0x1dae/0x2670 mm/page_alloc.c:4189
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
 alloc_slab_page mm/slub.c:1780 [inline]
 allocate_slab mm/slub.c:1917 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1980
 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 kmem_cache_alloc_node+0x118/0x2c0 mm/slub.c:3261
 __alloc_skb+0xf4/0x750 net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1162 [inline]
 nf_send_reset+0x479/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:281
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out+0x26/0x120 net/ipv4/ip_output.c:124
 nf_send_reset+0x10fb/0x15f0 net/ipv4/netfilter/nf_reject_ipv4.c:327
 nft_reject_inet_eval+0x3a9/0x680 net/netfilter/nft_reject_inet.c:31
 expr_call_ops_eval net/netfilter/nf_tables_core.c:214 [inline]
 nft_do_chain+0x48f/0x1670 net/netfilter/nf_tables_core.c:254
 nft_do_chain_inet+0x25c/0x340 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook+0x205/0x360 include/linux/netfilter.h:257
 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 __ip_queue_xmit+0x1120/0x1c60 net/ipv4/ip_output.c:538
 __tcp_transmit_skb+0x1ca3/0x31e0 net/ipv4/tcp_output.c:1404
 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline]
 tcp_send_syn_data net/ipv4/tcp_output.c:3867 [inline]
 tcp_connect+0x2d1a/0x4970 net/ipv4/tcp_output.c:3906
 tcp_v4_connect+0xf42/0x1990 net/ipv4/tcp_ipv4.c:324
 __inet_stream_connect+0x244/0xd80 net/ipv4/af_inet.c:672
 tcp_sendmsg_fastopen+0x38f/0x600 net/ipv4/tcp.c:1198
 tcp_sendmsg_locked+0x2efb/0x3330 net/ipv4/tcp.c:1240
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1460
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 __sys_sendto+0x46d/0x620 net/socket.c:2073
 __do_sys_sendto net/socket.c:2085 [inline]
 __se_sys_sendto net/socket.c:2081 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2081
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f273b70ab19
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2739961028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f273b990fa0 RCX: 00007f273b70ab19
RDX: ffffffffffffffb5 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f273b7a2b70 R08: 00002000000001c0 R09: 0000000000000010
R10: 00000000200007fd R11: 0000000000000246 R12: 0000000000000000
R13: 00007f273b991038 R14: 00007f273b990fa0 R15: 00007ffec42c0288
 </TASK>
Modules linked in:
---[ end trace 0f4f7698e56b85d8 ]---
RIP: 0010:check_preemption_disabled+0x5/0x110 lib/smp_processor_id.c:13
Code: a0 eb 32 8a e8 2c 01 00 00 65 ff 0d a1 b8 39 76 5b c3 00 00 cc 48 c7 c7 a0 50 7a 8a 48 c7 c6 e0 50 7a 8a eb 00 55 41 57 41 56 <53> 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 05
RSP: 0018:ffffc90003688000 EFLAGS: 00010046
RAX: 0000000000000004 RBX: ffffc90003688060 RCX: ffffffff9714df03
RDX: 0000000000000000 RSI: ffffffff8a2b3960 RDI: ffffffff8a7a5100
RBP: ffffc900036880d0 R08: dffffc0000000000 R09: 1ffffffff2208e18
R10: dffffc0000000000 R11: fffffbfff2208e19 R12: 3eac5b001efc8862
R13: ffff888061d3d940 R14: dffffc0000000000 R15: 1ffff920006d1004
FS:  00007f27399616c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003687ff8 CR3: 00000000622f8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	a0 eb 32 8a e8 2c 01 	movabs 0x12ce88a32eb,%al
   7:	00 00
   9:	65 ff 0d a1 b8 39 76 	decl   %gs:0x7639b8a1(%rip)        # 0x7639b8b1
  10:	5b                   	pop    %rbx
  11:	c3                   	ret
  12:	00 00                	add    %al,(%rax)
  14:	cc                   	int3
  15:	48 c7 c7 a0 50 7a 8a 	mov    $0xffffffff8a7a50a0,%rdi
  1c:	48 c7 c6 e0 50 7a 8a 	mov    $0xffffffff8a7a50e0,%rsi
  23:	eb 00                	jmp    0x25
  25:	55                   	push   %rbp
  26:	41 57                	push   %r15
  28:	41 56                	push   %r14
* 2a:	53                   	push   %rbx <-- trapping instruction
  2b:	48 83 ec 10          	sub    $0x10,%rsp
  2f:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax
  36:	00 00
  38:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  3d:	65                   	gs
  3e:	8b                   	.byte 0x8b
  3f:	05                   	.byte 0x5

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/11/03 17:25 linux-5.15.y 700e62ea909a e2d35131 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan BUG: stack guard page was hit in sys_sendto
* Struck through repros no longer work on HEAD.