======================================================
WARNING: possible circular locking dependency detected
6.7.0-syzkaller-12824-g9d64bf433c53 #0 Not tainted
------------------------------------------------------
syz-executor.3/24120 is trying to acquire lock:
ffffffff8d320a00 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline]
ffffffff8d320a00 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3761 [inline]
ffffffff8d320a00 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3842 [inline]
ffffffff8d320a00 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:3980 [inline]
ffffffff8d320a00 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_node+0xb8/0x460 mm/slub.c:3988
but task is already holding lock:
ffff8880484150c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
ffff8880484150c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&ei->xattr_sem){++++}-{3:3}:
down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371
ext4_xattr_set+0x149/0x370 fs/ext4/xattr.c:2558
__vfs_setxattr+0x173/0x1d0 fs/xattr.c:201
__vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235
__vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296
vfs_setxattr+0x146/0x350 fs/xattr.c:322
do_setxattr+0x142/0x170 fs/xattr.c:630
setxattr+0x159/0x170 fs/xattr.c:653
__do_sys_fsetxattr fs/xattr.c:709 [inline]
__se_sys_fsetxattr fs/xattr.c:698 [inline]
__ia32_sys_fsetxattr+0x25e/0x310 fs/xattr.c:698
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
-> #2 (jbd2_handle){++++}-{0:0}:
start_this_handle+0x10ff/0x15e0 fs/jbd2/transaction.c:463
jbd2__journal_start+0x391/0x840 fs/jbd2/transaction.c:520
__ext4_journal_start_sb+0x343/0x5d0 fs/ext4/ext4_jbd2.c:112
ext4_sample_last_mounted fs/ext4/file.c:837 [inline]
ext4_file_open+0x632/0xc80 fs/ext4/file.c:866
do_dentry_open+0x8d6/0x18c0 fs/open.c:953
do_open fs/namei.c:3641 [inline]
path_openat+0x1df6/0x2990 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_sys_openat fs/open.c:1435 [inline]
__se_sys_openat fs/open.c:1430 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1430
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
-> #1 (sb_internal){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1639 [inline]
sb_start_intwrite include/linux/fs.h:1822 [inline]
ext4_evict_inode+0xe5b/0x1a40 fs/ext4/inode.c:212
evict+0x2ed/0x6b0 fs/inode.c:665
iput_final fs/inode.c:1739 [inline]
iput.part.0+0x560/0x7b0 fs/inode.c:1765
iput+0x5c/0x80 fs/inode.c:1755
dentry_unlink_inode+0x292/0x430 fs/dcache.c:400
__dentry_kill+0x1ca/0x5f0 fs/dcache.c:603
shrink_kill fs/dcache.c:1048 [inline]
shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156
super_cache_scan+0x327/0x540 fs/super.c:221
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
-> #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+0x2445/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
__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]
slab_pre_alloc_hook mm/slub.c:3761 [inline]
slab_alloc_node mm/slub.c:3842 [inline]
__do_kmalloc_node mm/slub.c:3980 [inline]
__kmalloc_node+0xb8/0x460 mm/slub.c:3988
kmalloc_node include/linux/slab.h:610 [inline]
kvmalloc_node+0x6f/0x1a0 mm/util.c:617
kvmalloc include/linux/slab.h:728 [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+0x1c3f/0x3ce0 fs/ext4/xattr.c:1719
ext4_xattr_block_set+0xcbf/0x3180 fs/ext4/xattr.c:2039
ext4_xattr_set_handle+0xd70/0x1420 fs/ext4/xattr.c:2456
ext4_xattr_set+0x149/0x370 fs/ext4/xattr.c:2558
__vfs_setxattr+0x173/0x1d0 fs/xattr.c:201
__vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235
__vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296
vfs_setxattr+0x146/0x350 fs/xattr.c:322
do_setxattr+0x142/0x170 fs/xattr.c:630
setxattr+0x159/0x170 fs/xattr.c:653
__do_sys_fsetxattr fs/xattr.c:709 [inline]
__se_sys_fsetxattr fs/xattr.c:698 [inline]
__ia32_sys_fsetxattr+0x25e/0x310 fs/xattr.c:698
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:
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.3/24120:
#0: ffff88804e694420 (sb_writers#4){.+.+}-{0:0}, at: __do_sys_fsetxattr fs/xattr.c:707 [inline]
#0: ffff88804e694420 (sb_writers#4){.+.+}-{0:0}, at: __se_sys_fsetxattr fs/xattr.c:698 [inline]
#0: ffff88804e694420 (sb_writers#4){.+.+}-{0:0}, at: __ia32_sys_fsetxattr+0x17a/0x310 fs/xattr.c:698
#1: ffff888048415400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
#1: ffff888048415400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x123/0x350 fs/xattr.c:321
#2: ffff8880484150c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
#2: ffff8880484150c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371
stack backtrace:
CPU: 1 PID: 24120 Comm: syz-executor.3 Not tainted 6.7.0-syzkaller-12824-g9d64bf433c53 #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+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
__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]
slab_pre_alloc_hook mm/slub.c:3761 [inline]
slab_alloc_node mm/slub.c:3842 [inline]
__do_kmalloc_node mm/slub.c:3980 [inline]
__kmalloc_node+0xb8/0x460 mm/slub.c:3988
kmalloc_node include/linux/slab.h:610 [inline]
kvmalloc_node+0x6f/0x1a0 mm/util.c:617
kvmalloc include/linux/slab.h:728 [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+0x1c3f/0x3ce0 fs/ext4/xattr.c:1719
ext4_xattr_block_set+0xcbf/0x3180 fs/ext4/xattr.c:2039
ext4_xattr_set_handle+0xd70/0x1420 fs/ext4/xattr.c:2456
ext4_xattr_set+0x149/0x370 fs/ext4/xattr.c:2558
__vfs_setxattr+0x173/0x1d0 fs/xattr.c:201
__vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235
__vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296
vfs_setxattr+0x146/0x350 fs/xattr.c:322
do_setxattr+0x142/0x170 fs/xattr.c:630
setxattr+0x159/0x170 fs/xattr.c:653
__do_sys_fsetxattr fs/xattr.c:709 [inline]
__se_sys_fsetxattr fs/xattr.c:698 [inline]
__ia32_sys_fsetxattr+0x25e/0x310 fs/xattr.c:698
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: 0023:0xf7f4e579
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:00000000f7f495ac EFLAGS: 00000292 ORIG_RAX: 00000000000000e4
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000100
RDX: 00000000200001c0 RSI: 0000000000001001 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