Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007feb5d37f038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007feb5e72bf80 RCX: 00007feb5e60c0c9 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00007feb5d37f050 RBP: 00007feb5d37f1d0 R08: 0000000000000000 R09: 0000000000000058 R10: 00007feb5d37f050 R11: 0000000000000246 R12: 0000000000000058 R13: 00007ffc843a962f R14: 00007feb5d37f300 R15: 0000000000022000 ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline] BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline] BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline] BUG: KASAN: use-after-free in kref_put include/linux/kref.h:64 [inline] BUG: KASAN: use-after-free in anon_vma_name_put include/linux/mm_inline.h:343 [inline] BUG: KASAN: use-after-free in free_anon_vma_name include/linux/mm_inline.h:374 [inline] BUG: KASAN: use-after-free in vm_area_free+0x7e/0x230 kernel/fork.c:400 Write of size 4 at addr ffff88811642b870 by task syz-executor.2/12338 CPU: 0 PID: 12338 Comm: syz-executor.2 Tainted: G W 5.15.78-syzkaller-00911-gc73b4619ad86 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3d0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452 kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline] __refcount_sub_and_test include/linux/refcount.h:272 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] kref_put include/linux/kref.h:64 [inline] anon_vma_name_put include/linux/mm_inline.h:343 [inline] free_anon_vma_name include/linux/mm_inline.h:374 [inline] vm_area_free+0x7e/0x230 kernel/fork.c:400 dup_mmap+0xbcd/0xea0 kernel/fork.c:671 dup_mm+0x91/0x330 kernel/fork.c:1502 copy_mm+0x108/0x1b0 kernel/fork.c:1554 copy_process+0x1295/0x3250 kernel/fork.c:2245 kernel_clone+0x22d/0x990 kernel/fork.c:2646 __do_sys_clone3 kernel/fork.c:2930 [inline] __se_sys_clone3 kernel/fork.c:2914 [inline] __x64_sys_clone3+0x375/0x3a0 kernel/fork.c:2914 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7feb5e60c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007feb5d37f038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007feb5e72bf80 RCX: 00007feb5e60c0c9 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00007feb5d37f050 RBP: 00007feb5d37f1d0 R08: 0000000000000000 R09: 0000000000000058 R10: 00007feb5d37f050 R11: 0000000000000246 R12: 0000000000000058 R13: 00007ffc843a962f R14: 00007feb5d37f300 R15: 0000000000022000 Allocated by task 12296: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook mm/slab.h:550 [inline] slab_alloc_node mm/slub.c:3236 [inline] slab_alloc mm/slub.c:3244 [inline] kmem_cache_alloc+0x189/0x2f0 mm/slub.c:3249 vm_area_dup+0x26/0x1d0 kernel/fork.c:367 dup_mmap+0x6b8/0xea0 kernel/fork.c:591 dup_mm+0x91/0x330 kernel/fork.c:1502 copy_mm+0x108/0x1b0 kernel/fork.c:1554 copy_process+0x1295/0x3250 kernel/fork.c:2245 kernel_clone+0x22d/0x990 kernel/fork.c:2646 __do_sys_clone3 kernel/fork.c:2930 [inline] __se_sys_clone3 kernel/fork.c:2914 [inline] __x64_sys_clone3+0x375/0x3a0 kernel/fork.c:2914 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 12332: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1721 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1747 slab_free mm/slub.c:3515 [inline] kmem_cache_free+0x11a/0x2e0 mm/slub.c:3531 ____vm_area_free kernel/fork.c:386 [inline] vm_area_free+0x1ae/0x230 kernel/fork.c:412 remove_vma mm/mmap.c:190 [inline] exit_mmap+0x5dd/0x7a0 mm/mmap.c:3208 __mmput+0x95/0x300 kernel/fork.c:1162 mmput+0x50/0x60 kernel/fork.c:1184 exit_mm+0x50d/0x760 kernel/exit.c:504 do_exit+0x63c/0x24d0 kernel/exit.c:815 __do_sys_exit kernel/exit.c:894 [inline] __se_sys_exit kernel/exit.c:892 [inline] __ia32_sys_exit+0x0/0x40 kernel/exit.c:892 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88811642b818 which belongs to the cache vm_area_struct of size 232 The buggy address is located 88 bytes inside of 232-byte region [ffff88811642b818, ffff88811642b900) The buggy address belongs to the page: page:ffffea0004590ac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11642b flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100274d80 raw: 0000000000000000 00000000000d000d 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 8427, ts 471846763969, free_ts 467700035768 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495 prep_new_page mm/page_alloc.c:2501 [inline] get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281 __alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548 allocate_slab+0x62/0x580 mm/slub.c:1928 new_slab mm/slub.c:1991 [inline] ___slab_alloc+0x2e2/0x6f0 mm/slub.c:3024 __slab_alloc+0x4a/0x90 mm/slub.c:3111 slab_alloc_node mm/slub.c:3202 [inline] slab_alloc mm/slub.c:3244 [inline] kmem_cache_alloc+0x205/0x2f0 mm/slub.c:3249 vm_area_alloc+0x24/0x130 kernel/fork.c:359 mmap_region+0xb80/0x1af0 mm/mmap.c:1780 do_mmap+0x785/0xe40 mm/mmap.c:1584 vm_mmap_pgoff+0x1d4/0x420 mm/util.c:554 ksys_mmap_pgoff+0xed/0x1e0 mm/mmap.c:1633 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1364 [inline] free_pcp_prepare+0x448/0x450 mm/page_alloc.c:1435 free_unref_page_prepare mm/page_alloc.c:3433 [inline] free_unref_page_list+0x16a/0xad0 mm/page_alloc.c:3554 release_pages+0xf3e/0xf90 mm/swap.c:1010 free_pages_and_swap_cache+0x97/0xb0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0x860/0xa00 mm/mmu_gather.c:249 tlb_finish_mmu+0xd2/0x1f0 mm/mmu_gather.c:340 exit_mmap+0x46e/0x7a0 mm/mmap.c:3202 __mmput+0x95/0x300 kernel/fork.c:1162 mmput+0x50/0x60 kernel/fork.c:1184 exit_mm+0x50d/0x760 kernel/exit.c:504 do_exit+0x63c/0x24d0 kernel/exit.c:815 do_group_exit+0x13a/0x300 kernel/exit.c:925 get_signal+0x77e/0x1600 kernel/signal.c:2890 arch_do_signal_or_restart+0x9f/0x670 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0xd4/0x110 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:207 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x79/0xc0 kernel/entry/common.c:300 Memory state around the buggy address: ffff88811642b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811642b780: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc >ffff88811642b800: fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811642b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811642b900: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 28 00 sub %al,(%rax) 2: 00 00 add %al,(%rax) 4: 75 05 jne 0xb 6: 48 83 c4 28 add $0x28,%rsp a: c3 retq b: e8 f1 19 00 00 callq 0x1a01 10: 90 nop 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 retq 33: 48 c7 c1 b8 ff ff ff mov $0xffffffffffffffb8,%rcx 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W