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256lO8AYSMn02Fbh6Ge4aEhVEluscrFnyG/hOrmlHx8824rHLqET8XvSHne/uTG1ifDo/Hxk2CApokEXRa9+N4OsKZ35jiUxHj3AhOWknfHdR5gazAtEcXD7UjH3KjEKMeyeUK8Aw+uJAEgdpjmLsZxiJl9ESEu0YPymKw6Tf0+8et8d5tbXwoxecWDydsCQA9U0uxwkYLnH6dsDKJCZuuXai0LJMqxSQVLCLWbkheZsQXWCEDLP/Sx1uxD3kCsozyVzI6AkxXKC818daqHPdGhnsa5/KzHpI3IYixsqCcKHEjnPnybe5TfLhWLgQtO+Tsbk3Ru3SRMn6mg+GK75C4z2kiY88zlw/zDO+bkbL3MQ7KtI1bhudOam+imsf8rj0NywzTVh8ueaBe1+RBLMLbGKysyz46EvJO5HBC5ZpiQetTQJKgv36dWXpOX0LulMqroTSkH5C9n5n1GtZ6pSTLlTdmhMkbSd1JuWHv8oF1zU6zrBS94R2g1taKt/z/B4kHUAriK36KWOOdjM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed "UBSAN:shift-out-of-bounds_in_mm/vmscan.c" on: commit: 6be5e186fd655df4b3ba267054de2eaaadc71340 ("mm: vmscan: restore incremental cgroup iteration") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: trinity version: trinity-i386-abe9de86-1_20230429 with following parameters: runtime: 300s group: group-01 nr_groups: 5 compiler: clang-18 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) +--------------------------------------------+------------+------------+ | | 327eaca22f | 6be5e186fd | +--------------------------------------------+------------+------------+ | UBSAN:shift-out-of-bounds_in_mm/vmscan.c | 0 | 5 | | UBSAN:shift-out-of-bounds_in_mm/shrinker.c | 0 | 4 | +--------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202405281603.337d8284-lkp@intel.com [ 89.138129][ T3641] ------------[ cut here ]------------ [ 89.139149][ T3641] UBSAN: shift-out-of-bounds in mm/vmscan.c:4702:21 [ 89.140258][ T3641] shift exponent -1 is negative [ 89.140922][ T3641] CPU: 0 PID: 3641 Comm: trinity-c5 Tainted: G T 6.9.0-11986-g6be5e186fd65 #1 b52e1df0cfc6b45fcedea06291dcc02f3c365315 [ 89.142504][ T3641] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 89.143783][ T3641] Call Trace: [ 89.144289][ T3641] dump_stack_lvl (lib/dump_stack.c:116) [ 89.144943][ T3641] ? vprintk (kernel/printk/printk_safe.c:?) [ 89.145537][ T3641] dump_stack (lib/dump_stack.c:123) [ 89.146140][ T3641] __ubsan_handle_shift_out_of_bounds (lib/ubsan.c:232 lib/ubsan.c:468) [ 89.147025][ T3641] shrink_node (mm/vmscan.c:?) [ 89.147693][ T3641] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 89.148409][ T3641] ? allow_direct_reclaim (mm/vmscan.c:6355) [ 89.149122][ T3641] try_to_free_pages (mm/vmscan.c:? mm/vmscan.c:6503) [ 89.149775][ T3641] __alloc_pages_slowpath (mm/page_alloc.c:3859) [ 89.150449][ T3641] ? get_page_from_freelist (mm/page_alloc.c:3158) [ 89.151204][ T3641] __alloc_pages_noprof (mm/page_alloc.c:4673) [ 89.151916][ T3641] dup_task_struct (include/linux/gfp.h:269 include/linux/gfp.h:296 kernel/fork.c:358 kernel/fork.c:1115) [ 89.152566][ T3641] copy_process (kernel/fork.c:2221) [ 89.153225][ T3641] kernel_clone (kernel/fork.c:2797) [ 89.153860][ T3641] ? local_clock_noinstr (kernel/sched/build_utility.c:301) [ 89.154559][ T3641] __ia32_sys_clone (kernel/fork.c:2908) [ 89.155214][ T3641] ? trace_sys_enter (include/trace/events/syscalls.h:18) [ 89.155863][ T3641] ia32_sys_call (kbuild/obj/consumer/i386-randconfig-013-20240525/./arch/x86/include/generated/asm/syscalls_32.h:?) [ 89.156511][ T3641] __do_fast_syscall_32 (arch/x86/entry/common.c:?) [ 89.157200][ T3641] ? irqentry_exit_to_user_mode (kernel/entry/common.c:234) [ 89.157940][ T3641] do_fast_syscall_32 (arch/x86/entry/common.c:411) [ 89.158624][ T3641] do_SYSENTER_32 (arch/x86/entry/common.c:449) [ 89.159279][ T3641] entry_SYSENTER_32 (arch/x86/entry/entry_32.S:836) [ 89.159946][ T3641] EIP: 0xb7f4b539 [ 89.160481][ T3641] Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 0f 1f 00 58 b8 77 00 00 00 cd 80 90 0f 1f All code ======== 0: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 4: 10 07 adc %al,(%rdi) 6: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi a: 10 08 adc %cl,(%rax) c: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi ... 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24:* 89 e5 mov %esp,%ebp <-- trapping instruction 26: 0f 34 sysenter 28: cd 80 int $0x80 2a: 5d pop %rbp 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 0f 1f 00 nopl (%rax) 35: 58 pop %rax 36: b8 77 00 00 00 mov $0x77,%eax 3b: cd 80 int $0x80 3d: 90 nop 3e: 0f .byte 0xf 3f: 1f (bad) Code starting with the faulting instruction =========================================== 0: 5d pop %rbp 1: 5a pop %rdx 2: 59 pop %rcx 3: c3 ret 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 0f 1f 00 nopl (%rax) b: 58 pop %rax c: b8 77 00 00 00 mov $0x77,%eax 11: cd 80 int $0x80 13: 90 nop 14: 0f .byte 0xf 15: 1f (bad) [ 89.162727][ T3641] EAX: ffffffda EBX: 01200011 ECX: 00000000 EDX: 00000000 [ 89.163576][ T3641] ESI: 00000000 EDI: b7f462e8 EBP: 00000000 ESP: bfe67200 [ 89.164430][ T3641] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000286 [ 89.165448][ T3641] ---[ end trace ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240528/202405281603.337d8284-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki