[syzbot] [netfilter?] WARNING: suspicious RCU usage in hash_netportnet6_destroy

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 021533194476 Kconfig: Disable -Wstringop-overflow for GCC ..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=144caa38180000
kernel config: https://syzkaller.appspot.com/x/.config?x=f204e0b6490f4419
dashboard link: https://syzkaller.appspot.com/bug?extid=bcd44ebc3cd2db18f26c
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=16329057e80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15b8fe7be80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0fcac44f7d25/disk-02153319.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ec3e3d0e222c/vmlinux-02153319.xz
kernel image: https://storage.googleapis.com/syzbot-assets/11bfd95eb918/bzImage-02153319.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bcd44e...@syzkaller.appspotmail.com

=============================
WARNING: suspicious RCU usage
6.8.0-rc2-syzkaller-00199-g021533194476 #0 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_hash_gen.h:455 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by swapper/0/0:
#0: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline]
#0: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_core+0xcfc/0x1810 kernel/rcu/tree.c:2465

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.8.0-rc2-syzkaller-00199-g021533194476 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
lockdep_rcu_suspicious+0x220/0x340 kernel/locking/lockdep.c:6712
hash_netportnet6_destroy+0xf0/0x2c0 net/netfilter/ipset/ip_set_hash_gen.h:455
ip_set_destroy_set net/netfilter/ipset/ip_set_core.c:1180 [inline]
ip_set_destroy_set_rcu+0x6a/0xe0 net/netfilter/ipset/ip_set_core.c:1190
rcu_do_batch kernel/rcu/tree.c:2190 [inline]
rcu_core+0xd76/0x1810 kernel/rcu/tree.c:2465
__do_softirq+0x2bb/0x942 kernel/softirq.c:553
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x20/0x30 drivers/acpi/processor_idle.c:113
Code: 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 58 ea a5 74 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d c6 5c a9 00 f3 0f 1e fa fb f4 <fa> c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0018:ffffffff8de07ca8 EFLAGS: 00000246
RAX: ffffffff8de94680 RBX: ffff88801628e864 RCX: 00000000000148c9
RDX: 0000000000000001 RSI: ffff88801628e800 RDI: ffff88801628e864
RBP: 0000000000038f78 R08: ffff8880b9436d8b R09: 1ffff11017286db1
R10: dffffc0000000000 R11: ffffffff8b5dd030 R12: ffff888015b47000
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8e885a20
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:707
cpuidle_enter_state+0x118/0x490 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388
call_cpuidle kernel/sched/idle.c:134 [inline]
cpuidle_idle_call kernel/sched/idle.c:215 [inline]
do_idle+0x374/0x5d0 kernel/sched/idle.c:312
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 65 48 8b 05 58 ea a5 mov %gs:0x74a5ea58(%rip),%rax # 0x74a5ea6a
11: 74
12: 48 f7 00 08 00 00 00 testq $0x8,(%rax)
19: 75 10 jne 0x2b
1b: 66 90 xchg %ax,%ax
1d: 0f 00 2d c6 5c a9 00 verw 0xa95cc6(%rip) # 0xa95cea
24: f3 0f 1e fa endbr64
28: fb sti
29: f4 hlt
* 2a: fa cli <-- trapping instruction
2b: c3 ret
2c: cc int3
2d: cc int3
2e: cc int3
2f: cc int3
30: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
37: 00 00 00
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop


---
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[syzbot]

syzbot has bisected this issue to:

commit 97f7cf1cd80eeed3b7c808b7c12463295c751001
Author: Jozsef Kadlecsik <kad...@netfilter.org>
Date: Mon Jan 29 09:57:01 2024 +0000

netfilter: ipset: fix performance regression in swap operation

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15790a38180000
start commit: 021533194476 Kconfig: Disable -Wstringop-overflow for GCC ..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=17790a38180000
console output: https://syzkaller.appspot.com/x/log.txt?x=13790a38180000

kernel config: https://syzkaller.appspot.com/x/.config?x=f204e0b6490f4419
dashboard link: https://syzkaller.appspot.com/bug?extid=bcd44ebc3cd2db18f26c

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16329057e80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15b8fe7be80000

Reported-by: syzbot+bcd44e...@syzkaller.appspotmail.com
Fixes: 97f7cf1cd80e ("netfilter: ipset: fix performance regression in swap operation")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.