Hello, syzbot found the following issue on: HEAD commit: 73d0e32571a0 Add linux-next specific files for 20220607 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12191700080000 kernel config: https://syzkaller.appspot.com/x/.config?x=448ee2b64e828049 dashboard link: https://syzkaller.appspot.com/bug?extid=8847ae8c7bc46bc9c10e compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8847ae8c7bc46bc9c10e@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== ================================================================== BUG: KASAN: stack-out-of-bounds in folio_batch_add include/linux/pagevec.h:130 [inline] BUG: KASAN: stack-out-of-bounds in check_move_unevictable_pages+0x3f6/0x440 mm/vmscan.c:4857 Write of size 8 at addr ffffc9000ce5fbd8 by task syz-executor.0/17282 CPU: 0 PID: 17282 Comm: syz-executor.0 Not tainted 5.19.0-rc1-next-20220607-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xf/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 folio_batch_add include/linux/pagevec.h:130 [inline] check_move_unevictable_pages+0x3f6/0x440 mm/vmscan.c:4857 drm_gem_check_release_pagevec drivers/gpu/drm/drm_gem.c:511 [inline] drm_gem_put_pages+0x341/0x3f0 drivers/gpu/drm/drm_gem.c:642 drm_gem_shmem_put_pages_locked+0x13e/0x230 drivers/gpu/drm/drm_gem_shmem_helper.c:237 drm_gem_shmem_put_pages drivers/gpu/drm/drm_gem_shmem_helper.c:252 [inline] drm_gem_shmem_vm_close+0x45/0x70 drivers/gpu/drm/drm_gem_shmem_helper.c:588 remove_vma+0x81/0x130 mm/mmap.c:187 exit_mmap+0x2a1/0x750 mm/mmap.c:3215 __mmput+0x128/0x4c0 kernel/fork.c:1180 mmput+0x5c/0x70 kernel/fork.c:1201 exit_mm kernel/exit.c:510 [inline] do_exit+0xa18/0x2a00 kernel/exit.c:782 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 get_signal+0x2542/0x2600 kernel/signal.c:2857 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f832a289109 Code: Unable to access opcode bytes at RIP 0x7f832a2890df. RSP: 002b:00007f832b461218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f832a39bf68 RCX: 00007f832a289109 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f832a39bf68 RBP: 00007f832a39bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f832a39bf6c R13: 00007ffc361fd38f R14: 00007f832b461300 R15: 0000000000022000 </TASK> The buggy address belongs to stack of task syz-executor.0/17282 and is located at offset 16 in frame: do_exit+0x0/0x2a00 kernel/exit.c:423 This frame has 1 object: [32, 48) 'dead' The buggy address belongs to the virtual mapping at [ffffc9000ce58000, ffffc9000ce61000) created by: kernel_clone+0xe7/0xab0 kernel/fork.c:2648 The buggy address belongs to the physical page: page:ffffea00007de500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f794 memcg:ffff888076335e82 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888076335e82 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 17263, tgid 17263 (syz-executor.0), ts 1021283919880, free_ts 1021173517931 prep_new_page mm/page_alloc.c:2460 [inline] get_page_from_freelist+0xa64/0x3d10 mm/page_alloc.c:4279 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5503 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2279 vm_area_alloc_pages mm/vmalloc.c:2926 [inline] __vmalloc_area_node mm/vmalloc.c:2994 [inline] __vmalloc_node_range+0x735/0x13b0 mm/vmalloc.c:3164 alloc_thread_stack_node kernel/fork.c:311 [inline] dup_task_struct kernel/fork.c:971 [inline] copy_process+0x1568/0x7010 kernel/fork.c:2064 kernel_clone+0xe7/0xab0 kernel/fork.c:2648 __do_sys_clone+0xba/0x100 kernel/fork.c:2782 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1375 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1425 free_unref_page_prepare mm/page_alloc.c:3311 [inline] free_unref_page+0x19/0x7b0 mm/page_alloc.c:3426 __vunmap+0x86b/0xd50 mm/vmalloc.c:2664 __vfree+0x3c/0xd0 mm/vmalloc.c:2712 vfree+0x5a/0x90 mm/vmalloc.c:2743 kvfree+0x2e/0x50 mm/util.c:621 kvm_destroy_dirty_bitmap arch/x86/kvm/../../../virt/kvm/kvm_main.c:912 [inline] kvm_free_memslot arch/x86/kvm/../../../virt/kvm/kvm_main.c:919 [inline] kvm_free_memslots.part.0+0xd5/0x1a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:942 kvm_free_memslots arch/x86/kvm/../../../virt/kvm/kvm_main.c:938 [inline] kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1264 [inline] kvm_put_kvm+0x83e/0xb70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1294 kvm_vcpu_release+0x4d/0x70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3713 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffffc9000ce5fa80: 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 ffffc9000ce5fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000ce5fb80: 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 f3 ^ ffffc9000ce5fc00: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000ce5fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- This report is generated by a bot. 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