Code: ff 89 d1 80 e1 07 80 c1 03 38 c1 0f 8c 79 fe ff ff 48 8b 3c 24 e8 83 ed 52 f8 48 8b 14 24 e9 67 fe ff ff e8 75 68 eb f7 eb 05 6e 68 eb f7 e8 09 1d de ff 48 8b 44 24 20 42 80 3c 38 00 74 08 RSP: 62f7:ffffc9000342f0f0 EFLAGS: dffffc0000000000 ORIG_RAX: ffffc9000342f390 ================================================================== BUG: KASAN: stack-out-of-bounds in __show_regs+0xc1/0x610 arch/x86/kernel/process_64.c:83 Read of size 8 at addr ffffc9000342ef60 by task swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc1-next-20240729-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __show_regs+0xc1/0x610 arch/x86/kernel/process_64.c:83 show_trace_log_lvl+0x3d4/0x520 arch/x86/kernel/dumpstack.c:301 sched_show_task+0x506/0x6d0 kernel/sched/core.c:7512 report_rtnl_holders+0x327/0x400 net/core/rtnetlink.c:110 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:sched_core_balance+0x152/0x1180 kernel/sched/core.c:6272 Code: 00 48 c7 c2 00 88 0a 8c e8 8b fc 0a 00 4c 89 7c 24 68 e9 a9 0f 00 00 4c 89 ff e8 f9 9a 5e 0a e8 14 68 36 00 fb 4c 8b 6c 24 18 <41> 83 fd 08 0f 83 78 0f 00 00 4e 8d 3c e5 40 7a 29 8e 4c 89 f8 48 RSP: 0018:ffffffff8e6079a0 EFLAGS: 00000286 RAX: 4e401bb9b6d70400 RBX: ffff8880b923f788 RCX: ffffffff94f2f903 RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: ffffffff8c607c40 RBP: ffffffff8e607b18 R08: ffffffff9017d76f R09: 1ffffffff202faed R10: dffffc0000000000 R11: fffffbfff202faee R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b923ea00 do_balance_callbacks kernel/sched/core.c:4891 [inline] __balance_callbacks+0x188/0x280 kernel/sched/core.c:4945 __schedule+0x1a32/0x4a60 kernel/sched/core.c:6606 schedule_idle+0x53/0x90 kernel/sched/core.c:6721 do_idle+0x56a/0x5d0 kernel/sched/idle.c:354 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47a/0x500 init/main.c:1103 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 The buggy address belongs to the virtual mapping at [ffffc90003428000, ffffc90003431000) created by: copy_process+0x5d1/0x3d90 kernel/fork.c:2206 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5418b flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 10500, tgid 10500 (syz.2.549), ts 1089694906790, free_ts 1089530185491 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3442 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4700 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263 vm_area_alloc_pages mm/vmalloc.c:3584 [inline] __vmalloc_area_node mm/vmalloc.c:3660 [inline] __vmalloc_node_range_noprof+0x971/0x1460 mm/vmalloc.c:3841 alloc_thread_stack_node kernel/fork.c:314 [inline] dup_task_struct+0x444/0x8c0 kernel/fork.c:1115 copy_process+0x5d1/0x3d90 kernel/fork.c:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2788 __do_sys_clone3 kernel/fork.c:3092 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3071 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5229 tgid 5229 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612 vfree+0x186/0x2e0 mm/vmalloc.c:3364 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3285 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffffc9000342ee00: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 f2 ffffc9000342ee80: f2 f2 00 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00 >ffffc9000342ef00: f2 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 ^ ffffc9000342ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000342f000: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ================================================================== ---------------- Code disassembly (best guess): 0: ff 89 d1 80 e1 07 decl 0x7e180d1(%rcx) 6: 80 c1 03 add $0x3,%cl 9: 38 c1 cmp %al,%cl b: 0f 8c 79 fe ff ff jl 0xfffffe8a 11: 48 8b 3c 24 mov (%rsp),%rdi 15: e8 83 ed 52 f8 call 0xf852ed9d 1a: 48 8b 14 24 mov (%rsp),%rdx 1e: e9 67 fe ff ff jmp 0xfffffe8a 23: e8 75 68 eb f7 call 0xf7eb689d 28: eb 05 jmp 0x2f * 2a: e8 6e 68 eb f7 call 0xf7eb689d <-- trapping instruction 2f: e8 09 1d de ff call 0xffde1d3d 34: 48 8b 44 24 20 mov 0x20(%rsp),%rax 39: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 3e: 74 08 je 0x48