Oops: general protection fault, maybe for address 0xffffffff8bb69ac9: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 5812 Comm: syz.0.41 Not tainted 6.11.0-rc4-next-20240821-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__sanitizer_cov_trace_pc+0x5d/0x70 kernel/kcov.c:235 Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 RSP: cd2a:ffffc90017166878 EFLAGS: 00010087 ORIG_RAX: 62c308ed5fa57300 ================================================================== BUG: KASAN: stack-out-of-bounds in __show_regs+0xa6/0x610 arch/x86/kernel/process_64.c:83 Read of size 8 at addr ffffc90017166818 by task syz.0.41/5812 CPU: 1 UID: 0 PID: 5812 Comm: syz.0.41 Not tainted 6.11.0-rc4-next-20240821-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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+0xa6/0x610 arch/x86/kernel/process_64.c:83 show_regs arch/x86/kernel/dumpstack.c:472 [inline] __die_body+0x3c/0xb0 arch/x86/kernel/dumpstack.c:420 die_addr+0xb0/0xe0 arch/x86/kernel/dumpstack.c:460 __exc_general_protection arch/x86/kernel/traps.c:748 [inline] exc_general_protection+0x3dd/0x5d0 arch/x86/kernel/traps.c:693 The buggy address belongs to stack of task syz.0.41/5812 and is located at offset 56 in frame: kvm_wait+0x0/0x2c0 This frame has 2 objects: [32, 40) 'flags.i.i.i' [64, 72) 'flags.i.i' The buggy address belongs to the virtual mapping at [ffffc90017160000, ffffc90017169000) created by: copy_process+0x5d1/0x3d50 kernel/fork.c:2206 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24dc3 memcg:ffff88802f288e02 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88802f288e02 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 5810, tgid 5810 (syz.0.41), ts 114177242754, free_ts 113313001617 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517 prep_new_page mm/page_alloc.c:1525 [inline] get_page_from_freelist+0x3004/0x30c0 mm/page_alloc.c:3476 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 vm_area_alloc_pages mm/vmalloc.c:3600 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0xa40/0x1400 mm/vmalloc.c:3850 alloc_thread_stack_node kernel/fork.c:314 [inline] dup_task_struct+0x444/0x8c0 kernel/fork.c:1115 copy_process+0x5d1/0x3d50 kernel/fork.c:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2787 __do_sys_clone3 kernel/fork.c:3091 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3070 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 5768 tgid 5759 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1098 [inline] free_unref_folios+0xe8a/0x1850 mm/page_alloc.c:2699 folios_put_refs+0x76e/0x860 mm/swap.c:1007 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x496/0xc40 mm/mmap.c:1934 __mmput+0x115/0x390 kernel/fork.c:1347 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x28e0 kernel/exit.c:926 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x176f/0x1810 kernel/signal.c:2936 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffffc90017166700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90017166780: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 >ffffc90017166800: 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 ^ ffffc90017166880: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffffc90017166900: 00 f3 f3 f3 f1 f1 f1 f1 01 f2 02 f2 01 f2 04 f3 ================================================================== RAX: ffffffff8bb69ac9 RBX: ffffffff814074e0 RCX: 0000000000000046 RDX: ffffc90014fc5000 RSI: 0000000000006305 RDI: 0000000000006306 RBP: ffffffff8e07eea4 R08: ffffffff81717270 R09: ffffffff8e0881b1 R10: 0000000045e0360e R11: ffffffff931771a0 R12: 0000000041b58ab3 R13: ffffffff931771a0 R14: 0000000317166890 R15: ffffc90017166820 FS: 00007f4362fce6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000087 CR3: 0000000018b98000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__sanitizer_cov_trace_pc+0x5d/0x70 kernel/kcov.c:235 Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 RSP: 0018:ffffc90017166878 EFLAGS: 00010087 RAX: ffffffff8bb69ac9 RBX: ffffc90017166900 RCX: 0000000000040000 RDX: ffffc90014fc5000 RSI: 0000000000006305 RDI: 0000000000006306 RBP: ffffc90017166978 R08: ffffffff8bb6f85c R09: fffff52002e2cd50 R10: dffffc0000000000 R11: fffff52002e2cd50 R12: 0000000000000400 R13: dffffc0000000000 R14: ffffffff9318fb80 R15: ffffc90017166b00 FS: 00007f4362fce6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000087 CR3: 0000000018b98000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f8 clc 1: 15 00 00 83 fa adc $0xfa830000,%eax 6: 02 75 21 add 0x21(%rbp),%dh 9: 48 8b 91 00 16 00 00 mov 0x1600(%rcx),%rdx 10: 48 8b 32 mov (%rdx),%rsi 13: 48 8d 7e 01 lea 0x1(%rsi),%rdi 17: 8b 89 fc 15 00 00 mov 0x15fc(%rcx),%ecx 1d: 48 39 cf cmp %rcx,%rdi 20: 73 08 jae 0x2a 22: 48 89 3a mov %rdi,(%rdx) 25: 48 89 44 f2 08 mov %rax,0x8(%rdx,%rsi,8) * 2a: c3 ret <-- trapping instruction 2b: cc int3 2c: cc int3 2d: cc int3 2e: cc int3 2f: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 36: 00 00 00 39: 0f 1f 40 00 nopl 0x0(%rax) 3d: 90 nop 3e: 90 nop 3f: 90 nop