Hello, a user reported a UBSAN signed integer overflow in memcontrol.c Shall we change something in mem_cgroup_event_ratelimit()? ================================================================================ kernel: UBSAN: Undefined behaviour in mm/memcontrol.c:661:17 kernel: signed integer overflow: kernel: -2147483644 - 2147483525 cannot be represented in type 'long int' kernel: CPU: 1 PID: 11758 Comm: mybibtex2filena Tainted: P O 4.9.25-gentoo #4 kernel: Hardware name: XXXXXX, BIOS YYYYYY kernel: e9a3bd64 d1f444f2 00000007 e9a3bd94 7fffff85 e9a3bd74 d1fc8ffe e9a3bd74 kernel: d2b4ef1c e9a3bdf8 d1fc934b d28b15c0 e9a3bd98 0000002d e9a3bdc0 d2b4ef1c kernel: 0000002d 00000002 3431322d 33383437 00343436 d1700ca2 00000000 ecb4effc kernel: Call Trace: kernel: [<d1f444f2>] dump_stack+0x59/0x87 kernel: [<d1fc8ffe>] ubsan_epilogue+0xe/0x40 kernel: [<d1fc934b>] handle_overflow+0xbb/0xf0 kernel: [<d1700ca2>] ? update_curr+0xe2/0x500 kernel: [<d1fc93b2>] __ubsan_handle_sub_overflow+0x12/0x20 kernel: [<d196a553>] memcg_check_events.isra.36+0x223/0x360 kernel: [<d1f44281>] ? cpumask_any_but+0x31/0x60 kernel: [<d19709c5>] mem_cgroup_commit_charge+0x55/0x140 kernel: [<d1925b42>] ? ptep_clear_flush+0x72/0xb0 kernel: [<d19017de>] wp_page_copy+0x34e/0xb80 kernel: [<d19037a6>] do_wp_page+0x1e6/0x1300 kernel: [<d16f0350>] ? check_preempt_curr+0x110/0x230 kernel: [<d1695de6>] ? kmap_atomic_prot+0x126/0x210 kernel: [<d1909b3b>] handle_mm_fault+0x88b/0x1990 kernel: [<d16a1905>] ? _do_fork+0x155/0x5b0 kernel: [<d1689e3e>] __do_page_fault+0x2de/0x8a0 kernel: [<d16a1e27>] ? SyS_clone+0x27/0x30 kernel: [<d168a400>] ? __do_page_fault+0x8a0/0x8a0 kernel: [<d168a41a>] do_page_fault+0x1a/0x20 kernel: [<d265a35b>] error_code+0x67/0x6c kernel: ================================================================================ Thanks, Alice'
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