====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc3-syzkaller-00005-g7d31677bb7b1 #0 Not tainted ------------------------------------------------------ syz-executor.1/10233 is trying to acquire lock: ffffffff8c8e74e0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:271 [inline] ffffffff8c8e74e0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:728 [inline] ffffffff8c8e74e0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3434 [inline] ffffffff8c8e74e0 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_node+0x41/0x320 mm/slub.c:3491 but task is already holding lock: ffff888027884700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] ffff888027884700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6000 [inline] ffff888027884700 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x48f/0x800 fs/ext4/inode.c:6081 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->xattr_sem){++++}-{3:3}: down_write+0x92/0x200 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x160/0x1510 fs/ext4/xattr.c:2373 __ext4_set_acl+0x35c/0x5a0 fs/ext4/acl.c:217 ext4_set_acl+0x484/0x5f0 fs/ext4/acl.c:259 set_posix_acl+0x25b/0x320 fs/posix_acl.c:956 vfs_remove_acl+0x276/0x640 fs/posix_acl.c:1208 ovl_do_remove_acl fs/overlayfs/overlayfs.h:293 [inline] ovl_workdir_create+0x4b0/0x900 fs/overlayfs/super.c:821 ovl_make_workdir fs/overlayfs/super.c:1294 [inline] ovl_get_workdir fs/overlayfs/super.c:1444 [inline] ovl_fill_super+0x1c8a/0x7270 fs/overlayfs/super.c:2000 mount_nodev+0x64/0x120 fs/super.c:1417 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1501 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 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 -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0xfe7/0x14e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x390/0x850 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x411/0x5d0 fs/ext4/ext4_jbd2.c:111 ext4_sample_last_mounted fs/ext4/file.c:851 [inline] ext4_file_open+0x618/0xbf0 fs/ext4/file.c:880 do_dentry_open+0x6cc/0x13f0 fs/open.c:920 do_open fs/namei.c:3560 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3715 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1477 [inline] sb_start_intwrite include/linux/fs.h:1599 [inline] ext4_evict_inode+0x114b/0x1ca0 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1748 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1774 iput+0x5c/0x80 fs/inode.c:1764 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x12c/0x4f0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x33a/0x590 fs/super.c:104 do_shrink_slab+0x428/0xaa0 mm/vmscan.c:853 shrink_slab_memcg mm/vmscan.c:922 [inline] shrink_slab+0x388/0x660 mm/vmscan.c:1001 shrink_one+0x502/0x810 mm/vmscan.c:5343 shrink_many mm/vmscan.c:5394 [inline] lru_gen_shrink_node mm/vmscan.c:5511 [inline] shrink_node+0x2064/0x35f0 mm/vmscan.c:6459 kswapd_shrink_node mm/vmscan.c:7262 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7452 kswapd+0x677/0xd60 mm/vmscan.c:7712 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 __fs_reclaim_acquire mm/page_alloc.c:4716 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4730 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:728 [inline] slab_alloc_node mm/slub.c:3434 [inline] __kmem_cache_alloc_node+0x41/0x320 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:974 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:603 kvmalloc include/linux/slab.h:737 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1552 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1595 [inline] ext4_xattr_set_entry+0x1d82/0x39e0 fs/ext4/xattr.c:1737 ext4_xattr_block_set+0x618/0x3030 fs/ext4/xattr.c:1974 ext4_xattr_move_to_block fs/ext4/xattr.c:2668 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2743 [inline] ext4_expand_extra_isize_ea+0xa84/0x1880 fs/ext4/xattr.c:2835 __ext4_expand_extra_isize+0x33e/0x470 fs/ext4/inode.c:5960 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6003 [inline] __ext4_mark_inode_dirty+0x51b/0x800 fs/ext4/inode.c:6081 ext4_dirty_inode+0xdd/0x130 fs/ext4/inode.c:6113 __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2421 mark_inode_dirty include/linux/fs.h:2127 [inline] ext4_setattr+0xc92/0x2870 fs/ext4/inode.c:5637 notify_change+0xb2c/0x1180 fs/attr.c:482 chown_common+0x57f/0x650 fs/open.c:774 do_fchownat+0x12a/0x1e0 fs/open.c:805 ksys_chown include/linux/syscalls.h:1330 [inline] __do_sys_chown16 kernel/uid16.c:25 [inline] __se_sys_chown16 kernel/uid16.c:23 [inline] __ia32_sys_chown16+0xdc/0x110 kernel/uid16.c:23 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 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 --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz-executor.1/10233: #0: ffff888016090460 (sb_writers#4){.+.+}-{0:0}, at: do_fchownat+0x105/0x1e0 fs/open.c:802 #1: ffff888027884a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888027884a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: chown_common+0x31d/0x650 fs/open.c:764 #2: ffff888027884700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #2: ffff888027884700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6000 [inline] #2: ffff888027884700 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x48f/0x800 fs/ext4/inode.c:6081 stack backtrace: CPU: 1 PID: 10233 Comm: syz-executor.1 Not tainted 6.3.0-rc3-syzkaller-00005-g7d31677bb7b1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 __fs_reclaim_acquire mm/page_alloc.c:4716 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4730 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:728 [inline] slab_alloc_node mm/slub.c:3434 [inline] __kmem_cache_alloc_node+0x41/0x320 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:974 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:603 kvmalloc include/linux/slab.h:737 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1552 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1595 [inline] ext4_xattr_set_entry+0x1d82/0x39e0 fs/ext4/xattr.c:1737 ext4_xattr_block_set+0x618/0x3030 fs/ext4/xattr.c:1974 ext4_xattr_move_to_block fs/ext4/xattr.c:2668 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2743 [inline] ext4_expand_extra_isize_ea+0xa84/0x1880 fs/ext4/xattr.c:2835 __ext4_expand_extra_isize+0x33e/0x470 fs/ext4/inode.c:5960 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6003 [inline] __ext4_mark_inode_dirty+0x51b/0x800 fs/ext4/inode.c:6081 ext4_dirty_inode+0xdd/0x130 fs/ext4/inode.c:6113 __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2421 mark_inode_dirty include/linux/fs.h:2127 [inline] ext4_setattr+0xc92/0x2870 fs/ext4/inode.c:5637 notify_change+0xb2c/0x1180 fs/attr.c:482 chown_common+0x57f/0x650 fs/open.c:774 do_fchownat+0x12a/0x1e0 fs/open.c:805 ksys_chown include/linux/syscalls.h:1330 [inline] __do_sys_chown16 kernel/uid16.c:25 [inline] __se_sys_chown16 kernel/uid16.c:23 [inline] __ia32_sys_chown16+0xdc/0x110 kernel/uid16.c:23 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 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: 0023:0xf7fa3579 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:00000000f7f9e5cc EFLAGS: 00000296 ORIG_RAX: 00000000000000b6 RAX: ffffffffffffffda RBX: 0000000020000100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 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 retq 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