syzbot has found a reproducer for the following issue on: HEAD commit: 3db61221f4e8 Merge tag 'io_uring-6.0-2022-09-23' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=120a2035080000 kernel config: https://syzkaller.appspot.com/x/.config?x=c221af36f6d1d811 dashboard link: https://syzkaller.appspot.com/bug?extid=6b74cf8fcd7378d8be7c compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=163d8eff080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159bfd60880000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6b74cf8fcd7378d8be7c@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: stack-out-of-bounds in native_save_fl arch/x86/include/asm/irqflags.h:35 [inline] BUG: KASAN: stack-out-of-bounds in arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] BUG: KASAN: stack-out-of-bounds in arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline] BUG: KASAN: stack-out-of-bounds in lock_acquire+0x1c3/0x3c0 kernel/locking/lockdep.c:5669 Read of size 8 at addr ffffc90004dcf95f by task syz-executor479/11095 CPU: 0 PID: 11095 Comm: syz-executor479 Not tainted 6.0.0-rc6-syzkaller-00291-g3db61221f4e8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x1f0 mm/kasan/report.c:433 kasan_report+0xc3/0xf0 mm/kasan/report.c:495 native_save_fl arch/x86/include/asm/irqflags.h:35 [inline] arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline] lock_acquire+0x1c3/0x3c0 kernel/locking/lockdep.c:5669 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] inode_sb_list_del fs/inode.c:503 [inline] evict+0x161/0x620 fs/inode.c:654 ntfs_fill_super+0x3af3/0x42a0 fs/ntfs3/super.c:1190 get_tree_bdev+0x400/0x620 fs/super.c:1323 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4bae6c908a Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 f8 03 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffca10c1e08 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffca10c1e60 RCX: 00007f4bae6c908a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffca10c1e20 RBP: 00007ffca10c1e20 R08: 00007ffca10c1e60 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020001b80 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000110 </TASK> The buggy address belongs to stack of task syz-executor479/11095 and is located at offset 31 in frame: lock_acquire+0x0/0x3c0 kernel/locking/lockdep.c:5621 This frame has 3 objects: [32, 40) 'flags.i.i.i87' [64, 72) 'flags.i.i.i' [96, 136) 'hlock' The buggy address belongs to the virtual mapping at [ffffc90004dc8000, ffffc90004dd1000) created by: dup_task_struct+0x8b/0x490 kernel/fork.c:977 The buggy address belongs to the physical page: page:ffffea0001d86440 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76191 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 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 3696, tgid 3696 (syz-executor479), ts 1675853778124, free_ts 1675836504134 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5515 vm_area_alloc_pages mm/vmalloc.c:2958 [inline] __vmalloc_area_node mm/vmalloc.c:3026 [inline] __vmalloc_node_range+0x8f4/0x1290 mm/vmalloc.c:3196 alloc_thread_stack_node+0x307/0x500 kernel/fork.c:312 dup_task_struct+0x8b/0x490 kernel/fork.c:977 copy_process+0x637/0x3f20 kernel/fork.c:2085 kernel_clone+0x21f/0x790 kernel/fork.c:2671 __do_sys_clone kernel/fork.c:2805 [inline] __se_sys_clone kernel/fork.c:2789 [inline] __x64_sys_clone+0x228/0x290 kernel/fork.c:2789 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3522 release_pages+0x22c3/0x2540 mm/swap.c:1012 tlb_batch_pages_flush mm/mmu_gather.c:58 [inline] tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu+0x850/0xa70 mm/mmu_gather.c:262 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:353 exit_mmap+0x1cb/0x520 mm/mmap.c:3118 __mmput+0x111/0x3a0 kernel/fork.c:1187 exit_mm+0x1ef/0x2c0 kernel/exit.c:510 do_exit+0x4e1/0x20a0 kernel/exit.c:782 do_group_exit+0x23b/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffffc90004dcf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90004dcf880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90004dcf900: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 ^ ffffc90004dcf980: 00 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 ffffc90004dcfa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================
