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* [syzbot] [lvs?] UBSAN: shift-out-of-bounds in ip_vs_rht_desired_size
@ 2026-04-27 17:27 syzbot
  2026-04-27 22:37 ` Julian Anastasov
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-04-27 17:27 UTC (permalink / raw)
  To: coreteam, davem, edumazet, fw, horms, ja, kuba, linux-kernel,
	lvs-devel, netdev, netfilter-devel, pabeni, pablo, phil,
	syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    e728258debd5 Merge tag 'net-7.1-rc1' of git://git.kernel.o..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=169022ce580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ca77bfc4078c8193
dashboard link: https://syzkaller.appspot.com/bug?extid=217f1db9c791e27fe54a
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/24195bde5d1d/disk-e728258d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/78131d1b0e14/vmlinux-e728258d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/836d0dd78c10/bzImage-e728258d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+217f1db9c791e27fe54a@syzkaller.appspotmail.com

wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13
shift exponent 64 is too large for 64-bit type 'unsigned long'
CPU: 1 UID: 0 PID: 77 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound conn_resize_work_handler
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_shift_out_of_bounds+0x385/0x410 lib/ubsan.c:494
 __roundup_pow_of_two include/linux/log2.h:57 [inline]
 ip_vs_rht_desired_size+0x2cf/0x410 net/netfilter/ipvs/ip_vs_core.c:240
 ip_vs_conn_desired_size net/netfilter/ipvs/ip_vs_conn.c:765 [inline]
 conn_resize_work_handler+0x1b6/0x14c0 net/netfilter/ipvs/ip_vs_conn.c:822
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
---[ end trace ]---
Kernel panic - not syncing: UBSAN: panic_on_warn set ...
CPU: 1 UID: 0 PID: 77 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound conn_resize_work_handler
Call Trace:
 <TASK>
 vpanic+0x56c/0xa60 kernel/panic.c:650
 panic+0xc5/0xd0 kernel/panic.c:787
 check_panic_on_warn+0x89/0xb0 kernel/panic.c:524
 __ubsan_handle_shift_out_of_bounds+0x385/0x410 lib/ubsan.c:494
 __roundup_pow_of_two include/linux/log2.h:57 [inline]
 ip_vs_rht_desired_size+0x2cf/0x410 net/netfilter/ipvs/ip_vs_core.c:240
 ip_vs_conn_desired_size net/netfilter/ipvs/ip_vs_conn.c:765 [inline]
 conn_resize_work_handler+0x1b6/0x14c0 net/netfilter/ipvs/ip_vs_conn.c:822
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..


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2026-04-27 17:27 [syzbot] [lvs?] UBSAN: shift-out-of-bounds in ip_vs_rht_desired_size syzbot
2026-04-27 22:37 ` Julian Anastasov

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