Subject: [syzbot] [net?] WARNING in hsr_fill_frame_info

From: syzbot <[email-masked]>
Date: Thu, 29 Aug 2024 15:52:20 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    5be63fc19fca Linux 6.11-rc5
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=150a2d8d980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8605cd35ddc8ff3c
dashboard link: https://syzkaller.appspot.com/bug?extid=3d602af7549af539274e
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d1f76b980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17d49305980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/13cdc3162477/disk-5be63fc1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ea315e9db653/vmlinux-5be63fc1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eb68cddf5620/bzImage-5be63fc1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5237 at net/hsr/hsr_forward.c:602 handle_std_frame net/hsr/hsr_forward.c:602 [inline]
WARNING: CPU: 0 PID: 5237 at net/hsr/hsr_forward.c:602 hsr_fill_frame_info+0x3da/0x570 net/hsr/hsr_forward.c:630
Modules linked in:
CPU: 0 UID: 0 PID: 5237 Comm: syz-executor387 Not tainted 6.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:handle_std_frame net/hsr/hsr_forward.c:602 [inline]
RIP: 0010:hsr_fill_frame_info+0x3da/0x570 net/hsr/hsr_forward.c:630
Code: 00 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 55 bb fb f5 90 0f 0b 90 e9 09 ff ff ff e8 47 bb fb f5 90 <0f> 0b 90 eb 93 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c a3 fc ff ff 48
RSP: 0018:ffffc90000007278 EFLAGS: 00010246
RAX: ffffffff8b97d2c9 RBX: 0000000000000000 RCX: ffff88807529bc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807d910cc0 R08: ffffffff8b97d119 R09: 0000000000000000
R10: ffffc900000073c8 R11: fffff52000000e7b R12: dffffc0000000000
R13: 0000000000000008 R14: ffff888029d04f20 R15: ffffc900000073c0
FS:  0000555564778380(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005633c816f000 CR3: 000000001faac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 fill_frame_info net/hsr/hsr_forward.c:700 [inline]
 hsr_forward_skb+0x847/0x2b60 net/hsr/hsr_forward.c:715
 hsr_handle_frame+0x51b/0x7d0 net/hsr/hsr_slave.c:70
 __netif_receive_skb_core+0x13e8/0x4570 net/core/dev.c:5555
 __netif_receive_skb_list_core+0x2b7/0x980 net/core/dev.c:5737
 __netif_receive_skb_list net/core/dev.c:5804 [inline]
 netif_receive_skb_list_internal+0xa51/0xe30 net/core/dev.c:5896
 gro_normal_list include/net/gro.h:515 [inline]
 napi_complete_done+0x310/0x8e0 net/core/dev.c:6247
 gro_cell_poll+0x19a/0x1c0 net/core/gro_cells.c:66
 __napi_poll+0xcb/0x490 net/core/dev.c:6772
 napi_poll net/core/dev.c:6841 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6963
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
 tun_rx_batched+0x732/0x8f0
 tun_get_user+0x2f84/0x4720 drivers/net/tun.c:2006
 tun_chr_write_iter+0x113/0x1f0 drivers/net/tun.c:2052
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff04a780a30
Code: 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d 71 d6 07 00 00 74 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89
RSP: 002b:00007ffc50380778 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff04a780a30
RDX: 000000000000006a RSI: 00000000200006c0 RDI: 00000000000000c8
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

---
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