======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc4-syzkaller-00301-g5f583a3162ff #0 Not tainted
------------------------------------------------------
syz-executor.2/7135 is trying to acquire lock:
ffffffff8dd3ab20 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:334 [inline]
ffffffff8dd3ab20 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3891 [inline]
ffffffff8dd3ab20 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3981 [inline]
ffffffff8dd3ab20 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:4121 [inline]
ffffffff8dd3ab20 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_noprof+0xb5/0x420 mm/slub.c:4135
but task is already holding lock:
ffff888048d54e98 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock+0x16a/0x420 fs/xfs/xfs_inode.c:209
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&xfs_nondir_ilock_class#3){++++}-{3:3}:
down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695
xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:207
xfs_reclaim_inode fs/xfs/xfs_icache.c:943 [inline]
xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1629 [inline]
xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1711
xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1760
xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1009
super_cache_scan+0x409/0x550 fs/super.c:227
do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
shrink_slab+0x18a/0x1310 mm/shrinker.c:662
shrink_one+0x493/0x7c0 mm/vmscan.c:4790
shrink_many mm/vmscan.c:4851 [inline]
lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951
shrink_node mm/vmscan.c:5910 [inline]
kswapd_shrink_node mm/vmscan.c:6720 [inline]
balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911
kswapd+0x5ea/0xbf0 mm/vmscan.c:7180
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #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:3869 [inline]
__lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
__fs_reclaim_acquire mm/page_alloc.c:3801 [inline]
fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815
might_alloc include/linux/sched/mm.h:334 [inline]
slab_pre_alloc_hook mm/slub.c:3891 [inline]
slab_alloc_node mm/slub.c:3981 [inline]
__do_kmalloc_node mm/slub.c:4121 [inline]
__kmalloc_noprof+0xb5/0x420 mm/slub.c:4135
kmalloc_noprof include/linux/slab.h:664 [inline]
xfs_attr_shortform_list fs/xfs/xfs_attr_list.c:117 [inline]
xfs_attr_list_ilocked+0x9a0/0x1b00 fs/xfs/xfs_attr_list.c:569
xfs_attr_list+0x1f9/0x2b0 fs/xfs/xfs_attr_list.c:595
xfs_vn_listxattr+0x11f/0x1c0 fs/xfs/xfs_xattr.c:324
vfs_listxattr+0xb7/0x140 fs/xattr.c:493
ovl_copy_xattr+0x1db/0xcb0 fs/overlayfs/copy_up.c:98
ovl_copy_up_metadata+0x1ad/0x760 fs/overlayfs/copy_up.c:650
ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:870 [inline]
ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
ovl_copy_up_one+0x1b12/0x3490 fs/overlayfs/copy_up.c:1168
ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223
ovl_link+0x31/0x220 fs/overlayfs/dir.c:716
vfs_link+0x83e/0xe50 fs/namei.c:4613
do_linkat+0x533/0x5e0 fs/namei.c:4683
__do_sys_link fs/namei.c:4717 [inline]
__se_sys_link fs/namei.c:4715 [inline]
__ia32_sys_link+0x80/0xa0 fs/namei.c:4715
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(&xfs_nondir_ilock_class#3);
lock(fs_reclaim);
lock(&xfs_nondir_ilock_class#3);
lock(fs_reclaim);
*** DEADLOCK ***
6 locks held by syz-executor.2/7135:
#0: ffff888021bd6420 (sb_writers#20){.+.+}-{0:0}, at: filename_create+0x10d/0x530 fs/namei.c:3893
#1: ffff888048b40d10 (&ovl_i_mutex_dir_key[depth]/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:826 [inline]
#1: ffff888048b40d10 (&ovl_i_mutex_dir_key[depth]/1){+.+.}-{3:3}, at: filename_create+0x1c2/0x530 fs/namei.c:3900
#2: ffff888048b412e0 (&ovl_i_mutex_key[depth]){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline]
#2: ffff888048b412e0 (&ovl_i_mutex_key[depth]){+.+.}-{3:3}, at: vfs_link+0x652/0xe50 fs/namei.c:4604
#3: ffff888048b41698 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:657 [inline]
#3: ffff888048b41698 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_copy_up_start+0x4d/0x2f0 fs/overlayfs/util.c:719
#4: ffff888026832420 (sb_writers#4){.+.+}-{0:0}, at: ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:868 [inline]
#4: ffff888026832420 (sb_writers#4){.+.+}-{0:0}, at: ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
#4: ffff888026832420 (sb_writers#4){.+.+}-{0:0}, at: ovl_copy_up_one+0x1aff/0x3490 fs/overlayfs/copy_up.c:1168
#5: ffff888048d54e98 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock+0x16a/0x420 fs/xfs/xfs_inode.c:209
stack backtrace:
CPU: 1 PID: 7135 Comm: syz-executor.2 Not tainted 6.10.0-rc4-syzkaller-00301-g5f583a3162ff #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
check_noncircular+0x31a/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+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
__fs_reclaim_acquire mm/page_alloc.c:3801 [inline]
fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815
might_alloc include/linux/sched/mm.h:334 [inline]
slab_pre_alloc_hook mm/slub.c:3891 [inline]
slab_alloc_node mm/slub.c:3981 [inline]
__do_kmalloc_node mm/slub.c:4121 [inline]
__kmalloc_noprof+0xb5/0x420 mm/slub.c:4135
kmalloc_noprof include/linux/slab.h:664 [inline]
xfs_attr_shortform_list fs/xfs/xfs_attr_list.c:117 [inline]
xfs_attr_list_ilocked+0x9a0/0x1b00 fs/xfs/xfs_attr_list.c:569
xfs_attr_list+0x1f9/0x2b0 fs/xfs/xfs_attr_list.c:595
xfs_vn_listxattr+0x11f/0x1c0 fs/xfs/xfs_xattr.c:324
vfs_listxattr+0xb7/0x140 fs/xattr.c:493
ovl_copy_xattr+0x1db/0xcb0 fs/overlayfs/copy_up.c:98
ovl_copy_up_metadata+0x1ad/0x760 fs/overlayfs/copy_up.c:650
ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:870 [inline]
ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
ovl_copy_up_one+0x1b12/0x3490 fs/overlayfs/copy_up.c:1168
ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223
ovl_link+0x31/0x220 fs/overlayfs/dir.c:716
vfs_link+0x83e/0xe50 fs/namei.c:4613
do_linkat+0x533/0x5e0 fs/namei.c:4683
__do_sys_link fs/namei.c:4717 [inline]
__se_sys_link fs/namei.c:4715 [inline]
__ia32_sys_link+0x80/0xa0 fs/namei.c:4715
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf72c3579
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:00000000f5eb55ac EFLAGS: 00000292 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000020000300
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
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