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Message-ID: <6901e567.050a0220.32483.0209.GAE@google.com> Date: Wed, 29 Oct 2025 02:59:03 -0700 From: syzbot <syzbot+c16daba279a1161acfb0@...kaller.appspotmail.com> To: dmantipov@...dex.ru, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_commit_truncate Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: UBSAN: signed-integer-overflow in ip_idents_reserve ================================================================================ UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11 1823136308 + 1553543319 cannot be represented in type 'int' CPU: 1 PID: 234 Comm: kworker/u4:4 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: phy9 ieee80211_iface_work Call Trace: <IRQ> dump_stack+0xfd/0x16e lib/dump_stack.c:118 ubsan_epilogue+0xa/0x30 lib/ubsan.c:148 handle_overflow+0x192/0x1b0 lib/ubsan.c:180 arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline] atomic_add_return include/asm-generic/atomic-instrumented.h:73 [inline] ip_idents_reserve+0x14a/0x170 net/ipv4/route.c:521 __ip_select_ident+0xe4/0x1c0 net/ipv4/route.c:538 iptunnel_xmit+0x465/0x840 net/ipv4/ip_tunnel_core.c:80 udp_tunnel_xmit_skb+0x1b7/0x280 net/ipv4/udp_tunnel_core.c:190 geneve_xmit_skb drivers/net/geneve.c:1004 [inline] geneve_xmit+0x1d00/0x2130 drivers/net/geneve.c:1117 __netdev_start_xmit include/linux/netdevice.h:4824 [inline] netdev_start_xmit include/linux/netdevice.h:4838 [inline] xmit_one net/core/dev.c:3601 [inline] dev_hard_start_xmit+0x2aa/0x7f0 net/core/dev.c:3617 __dev_queue_xmit+0x1684/0x2960 net/core/dev.c:4203 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x101a/0x1480 net/ipv6/ip6_output.c:130 rcu_read_lock include/linux/rcupdate.h:718 [inline] nf_hook include/linux/netfilter.h:220 [inline] NF_HOOK+0x45/0x2c0 include/linux/netfilter.h:294 mld_sendpack+0x5f1/0xa50 net/ipv6/mcast.c:1676 mld_send_cr net/ipv6/mcast.c:1972 [inline] mld_ifc_timer_expire+0x7e1/0x990 net/ipv6/mcast.c:2471 call_timer_fn+0x105/0x490 kernel/time/timer.c:1444 expire_timers kernel/time/timer.c:1489 [inline] __run_timers+0x5d5/0x7a0 kernel/time/timer.c:1783 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1796 __do_softirq+0x267/0x92e kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x9b/0xe0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0x227/0x230 kernel/softirq.c:423 irq_exit_rcu+0x5/0x20 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0xea/0x100 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:console_unlock+0xbb0/0xfc0 kernel/printk/printk.c:2548 Code: 00 00 48 83 7c 24 28 00 48 8b 5c 24 30 75 07 e8 76 5d 18 00 eb 0a e8 6f 5d 18 00 e8 ba 5b 1e 00 48 89 5c 24 58 ff 74 24 58 9d <f6> 44 24 07 01 0f 84 08 f6 ff ff e8 50 5d 18 00 48 c7 c7 40 1c 4a RSP: 0018:ffffc9000197f9b0 EFLAGS: 00000293 RAX: fa4294196ff25300 RBX: 0000000000000293 RCX: ffff888019648000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff81594776 RBP: ffffc9000197fb00 R08: dffffc0000000000 R09: fffffbfff191fb2e R10: fffffbfff191fb2e R11: 1ffffffff191fb2d R12: 0000000000000057 R13: ffffc9000197fa20 R14: 1ffffffff179392d R15: dffffc0000000000 vprintk_emit+0x160/0x240 kernel/printk/printk.c:2060 printk+0x76/0xa0 kernel/printk/printk.c:2108 ieee80211_sta_find_ibss net/mac80211/ibss.c:1486 [inline] ieee80211_ibss_work+0x1054/0x1180 net/mac80211/ibss.c:1712 process_one_work+0x85b/0xfe0 kernel/workqueue.c:2282 worker_thread+0xa9b/0x1430 kernel/workqueue.c:2428 kthread+0x384/0x410 kernel/kthread.c:328 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 ================================================================================ ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 83 7c 24 28 00 cmpq $0x0,0x28(%rsp) 8: 48 8b 5c 24 30 mov 0x30(%rsp),%rbx d: 75 07 jne 0x16 f: e8 76 5d 18 00 call 0x185d8a 14: eb 0a jmp 0x20 16: e8 6f 5d 18 00 call 0x185d8a 1b: e8 ba 5b 1e 00 call 0x1e5bda 20: 48 89 5c 24 58 mov %rbx,0x58(%rsp) 25: ff 74 24 58 push 0x58(%rsp) 29: 9d popf * 2a: f6 44 24 07 01 testb $0x1,0x7(%rsp) <-- trapping instruction 2f: 0f 84 08 f6 ff ff je 0xfffff63d 35: e8 50 5d 18 00 call 0x185d8a 3a: 48 rex.W 3b: c7 .byte 0xc7 3c: c7 .byte 0xc7 3d: 40 1c 4a rex sbb $0x4a,%al Tested on: commit: d3d0b4e2 Linux 5.10.245 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y console output: https://syzkaller.appspot.com/x/log.txt?x=126abd42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e1734393bfd41d2b dashboard link: https://syzkaller.appspot.com/bug?extid=c16daba279a1161acfb0 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=142bf614580000
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