====================================================== WARNING: possible circular locking dependency detected 6.5.0-syzkaller-04808-g6c1b980a7e79 #0 Not tainted ------------------------------------------------------ syz-executor.3/10958 is trying to acquire lock: ffffffff8cb14780 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8cb14780 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:709 [inline] ffffffff8cb14780 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3460 [inline] ffffffff8cb14780 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_node+0x51/0x350 mm/slub.c:3517 but task is already holding lock: ffff88802b2a6ec8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] ffff88802b2a6ec8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5807 [inline] ffff88802b2a6ec8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x4a1/0x800 fs/ext4/inode.c:5888 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->xattr_sem){++++}-{3:3}: down_write+0x93/0x200 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_inline_data_truncate+0x1af/0xc20 fs/ext4/inline.c:1916 ext4_truncate+0x944/0x12b0 fs/ext4/inode.c:4083 ext4_evict_inode+0x7a1/0x1a30 fs/ext4/inode.c:258 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1775 [inline] iput.part.0+0x55e/0x7a0 fs/inode.c:1801 iput+0x5c/0x80 fs/inode.c:1791 ext4_orphan_cleanup+0x70f/0x11d0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5554 [inline] ext4_fill_super+0x970d/0xae10 fs/ext4/super.c:5675 get_tree_bdev+0x390/0x630 fs/super.c:1551 vfs_get_tree+0x8c/0x370 fs/super.c:1724 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __ia32_sys_mount+0x291/0x310 fs/namespace.c:3861 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1600 [inline] sb_start_intwrite include/linux/fs.h:1722 [inline] ext4_evict_inode+0xe55/0x1a30 fs/ext4/inode.c:212 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1775 [inline] iput.part.0+0x55e/0x7a0 fs/inode.c:1801 iput+0x5c/0x80 fs/inode.c:1791 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 shrink_dentry_list+0x235/0x7e0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x31f/0x540 fs/super.c:228 do_shrink_slab+0x422/0xaa0 mm/vmscan.c:900 shrink_slab_memcg mm/vmscan.c:969 [inline] shrink_slab+0x48b/0x6e0 mm/vmscan.c:1048 shrink_one+0x4f7/0x700 mm/vmscan.c:5417 shrink_many mm/vmscan.c:5469 [inline] lru_gen_shrink_node mm/vmscan.c:5586 [inline] shrink_node+0x20c2/0x3740 mm/vmscan.c:6526 kswapd_shrink_node mm/vmscan.c:7331 [inline] balance_pgdat+0xa37/0x1b90 mm/vmscan.c:7521 kswapd+0x5be/0xbf0 mm/vmscan.c:7781 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __fs_reclaim_acquire mm/page_alloc.c:3564 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3578 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x51/0x350 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1030 kmalloc_node include/linux/slab.h:619 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:607 kvmalloc include/linux/slab.h:737 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1577 [inline] ext4_xattr_set_entry+0x1c3d/0x3ca0 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x678/0x30e0 fs/ext4/xattr.c:1970 ext4_xattr_move_to_block fs/ext4/xattr.c:2667 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2742 [inline] ext4_expand_extra_isize_ea+0x1306/0x1b20 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x342/0x470 fs/ext4/inode.c:5767 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5810 [inline] __ext4_mark_inode_dirty+0x52b/0x800 fs/ext4/inode.c:5888 __ext4_unlink+0x630/0xc60 fs/ext4/namei.c:3291 ext4_unlink+0x40b/0x580 fs/ext4/namei.c:3320 vfs_unlink+0x2f1/0x900 fs/namei.c:4332 do_unlinkat+0x3da/0x6d0 fs/namei.c:4398 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __ia32_sys_unlinkat+0xc1/0x130 fs/namei.c:4434 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 other info that might help us debug this: Chain exists of: fs_reclaim --> sb_internal --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(sb_internal); lock(&ei->xattr_sem); lock(fs_reclaim); *** DEADLOCK *** 4 locks held by syz-executor.3/10958: #0: ffff888073890410 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x1ca/0x6d0 fs/namei.c:4379 #1: ffff88802ac62c00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:837 [inline] #1: ffff88802ac62c00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x27c/0x6d0 fs/namei.c:4383 #2: ffff88802b2a7200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #2: ffff88802b2a7200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd3/0x900 fs/namei.c:4321 #3: ffff88802b2a6ec8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #3: ffff88802b2a6ec8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5807 [inline] #3: ffff88802b2a6ec8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x4a1/0x800 fs/ext4/inode.c:5888 stack backtrace: CPU: 2 PID: 10958 Comm: syz-executor.3 Not tainted 6.5.0-syzkaller-04808-g6c1b980a7e79 #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+0x311/0x3f0 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:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __fs_reclaim_acquire mm/page_alloc.c:3564 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3578 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x51/0x350 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1030 kmalloc_node include/linux/slab.h:619 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:607 kvmalloc include/linux/slab.h:737 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1577 [inline] ext4_xattr_set_entry+0x1c3d/0x3ca0 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x678/0x30e0 fs/ext4/xattr.c:1970 ext4_xattr_move_to_block fs/ext4/xattr.c:2667 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2742 [inline] ext4_expand_extra_isize_ea+0x1306/0x1b20 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x342/0x470 fs/ext4/inode.c:5767 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5810 [inline] __ext4_mark_inode_dirty+0x52b/0x800 fs/ext4/inode.c:5888 __ext4_unlink+0x630/0xc60 fs/ext4/namei.c:3291 ext4_unlink+0x40b/0x580 fs/ext4/namei.c:3320 vfs_unlink+0x2f1/0x900 fs/namei.c:4332 do_unlinkat+0x3da/0x6d0 fs/namei.c:4398 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __ia32_sys_unlinkat+0xc1/0x130 fs/namei.c:4434 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f64579 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:00000000f7f5f5ac EFLAGS: 00000292 ORIG_RAX: 000000000000012d RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000200003c0 RDX: 0000000000000000 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