====================================================== WARNING: possible circular locking dependency detected 6.7.0-syzkaller-12991-g7a396820222d #0 Not tainted ------------------------------------------------------ syz-executor.3/18522 is trying to acquire lock: ffff888050cd9a50 (&ni->mrec_lock){+.+.}-{3:3}, at: map_mft_record+0x4a/0x730 fs/ntfs/mft.c:154 but task is already holding lock: ffff888050cd99c0 (&rl->lock){++++}-{3:3}, at: ntfs_truncate+0x1e8/0x2a20 fs/ntfs/inode.c:2378 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rl->lock){++++}-{3:3}: down_write+0x3a/0x50 kernel/locking/rwsem.c:1579 __ntfs_clear_inode+0x24/0x260 fs/ntfs/inode.c:2189 ntfs_evict_big_inode+0x29e/0x530 fs/ntfs/inode.c:2278 evict+0x2ed/0x6b0 fs/inode.c:665 dispose_list+0x117/0x1e0 fs/inode.c:698 prune_icache_sb+0xeb/0x150 fs/inode.c:883 super_cache_scan+0x372/0x540 fs/super.c:223 do_shrink_slab+0x428/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa83/0x1310 mm/shrinker.c:626 shrink_one+0x48f/0x7b0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x2149/0x3740 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6693 [inline] balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6883 kswapd+0x5be/0xbf0 mm/vmscan.c:7143 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] prepare_alloc_pages.constprop.0+0x155/0x550 mm/page_alloc.c:4338 __alloc_pages+0x193/0x2440 mm/page_alloc.c:4556 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 folio_alloc+0x1e/0xe0 mm/mempolicy.c:2211 filemap_alloc_folio+0x3bb/0x490 mm/filemap.c:975 do_read_cache_folio+0x1b8/0x540 mm/filemap.c:3667 do_read_cache_page mm/filemap.c:3769 [inline] read_cache_page+0x5b/0x160 mm/filemap.c:3778 read_mapping_page include/linux/pagemap.h:888 [inline] ntfs_map_page fs/ntfs/aops.h:75 [inline] map_mft_record_page fs/ntfs/mft.c:73 [inline] map_mft_record+0x1dd/0x730 fs/ntfs/mft.c:156 ntfs_read_locked_inode+0x19b/0x5860 fs/ntfs/inode.c:550 ntfs_iget+0x130/0x180 fs/ntfs/inode.c:177 ntfs_lookup+0x312/0xc30 fs/ntfs/namei.c:117 lookup_open.isra.0+0x926/0x13b0 fs/namei.c:3474 open_last_lookups fs/namei.c:3565 [inline] path_openat+0x931/0x2990 fs/namei.c:3795 do_filp_open+0x1de/0x430 fs/namei.c:3825 do_sys_openat2+0x176/0x1e0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_compat_sys_openat fs/open.c:1479 [inline] __se_compat_sys_openat fs/open.c:1477 [inline] __ia32_compat_sys_openat+0x16e/0x200 fs/open.c:1477 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x79/0x110 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x70/0x7a -> #0 (&ni->mrec_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2445/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:752 map_mft_record+0x4a/0x730 fs/ntfs/mft.c:154 ntfs_truncate+0x263/0x2a20 fs/ntfs/inode.c:2383 ntfs_truncate_vfs fs/ntfs/inode.c:2864 [inline] ntfs_setattr+0x44d/0x640 fs/ntfs/inode.c:2916 notify_change+0x742/0x11c0 fs/attr.c:499 do_truncate+0x15c/0x220 fs/open.c:66 handle_truncate fs/namei.c:3299 [inline] do_open fs/namei.c:3645 [inline] path_openat+0x24b6/0x2990 fs/namei.c:3798 do_filp_open+0x1de/0x430 fs/namei.c:3825 do_sys_openat2+0x176/0x1e0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_compat_sys_openat fs/open.c:1479 [inline] __se_compat_sys_openat fs/open.c:1477 [inline] __ia32_compat_sys_openat+0x16e/0x200 fs/open.c:1477 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x79/0x110 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x70/0x7a other info that might help us debug this: Chain exists of: &ni->mrec_lock --> fs_reclaim --> &rl->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rl->lock); lock(fs_reclaim); lock(&rl->lock); lock(&ni->mrec_lock); *** DEADLOCK *** 3 locks held by syz-executor.3/18522: #0: ffff88801b606420 (sb_writers#37){.+.+}-{0:0}, at: do_open fs/namei.c:3634 [inline] #0: ffff88801b606420 (sb_writers#37){.+.+}-{0:0}, at: path_openat+0x1fb6/0x2990 fs/namei.c:3798 #1: ffff888050cd9d30 (&sb->s_type->i_mutex_key#45){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff888050cd9d30 (&sb->s_type->i_mutex_key#45){+.+.}-{3:3}, at: do_truncate+0x14b/0x220 fs/open.c:64 #2: ffff888050cd99c0 (&rl->lock){++++}-{3:3}, at: ntfs_truncate+0x1e8/0x2a20 fs/ntfs/inode.c:2378 stack backtrace: CPU: 3 PID: 18522 Comm: syz-executor.3 Not tainted 6.7.0-syzkaller-12991-g7a396820222d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x317/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2445/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:752 map_mft_record+0x4a/0x730 fs/ntfs/mft.c:154 ntfs_truncate+0x263/0x2a20 fs/ntfs/inode.c:2383 ntfs_truncate_vfs fs/ntfs/inode.c:2864 [inline] ntfs_setattr+0x44d/0x640 fs/ntfs/inode.c:2916 notify_change+0x742/0x11c0 fs/attr.c:499 do_truncate+0x15c/0x220 fs/open.c:66 handle_truncate fs/namei.c:3299 [inline] do_open fs/namei.c:3645 [inline] path_openat+0x24b6/0x2990 fs/namei.c:3798 do_filp_open+0x1de/0x430 fs/namei.c:3825 do_sys_openat2+0x176/0x1e0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_compat_sys_openat fs/open.c:1479 [inline] __se_compat_sys_openat fs/open.c:1477 [inline] __ia32_compat_sys_openat+0x16e/0x200 fs/open.c:1477 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x79/0x110 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x70/0x7a RIP: 0023:0xf7fa5579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7fa05ac EFLAGS: 00000292 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000020000380 RDX: 0000000000103a42 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi