loop6: detected capacity change from 0 to 512
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.6.1607/13879 is trying to acquire lock:
ffff888034ec2c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2575
but task is already holding lock:
ffff888050a12728 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
ffff888050a12728 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6382 [inline]
ffff888050a12728 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x606/0x8b0 fs/ext4/inode.c:6463
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&ei->xattr_sem){++++}-{4:4}:
down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590
ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
ext4_destroy_inline_data+0x2d/0xe0 fs/ext4/inline.c:1805
ext4_do_writepages+0x1185/0x3f50 fs/ext4/inode.c:2814
ext4_writepages+0x347/0x790 fs/ext4/inode.c:3029
do_writepages+0x278/0x600 mm/page-writeback.c:2575
__writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1762
writeback_sb_inodes+0x766/0x1c70 fs/fs-writeback.c:2054
wb_writeback+0x1c0/0xbe0 fs/fs-writeback.c:2239
wb_do_writeback fs/fs-writeback.c:2386 [inline]
wb_workfn+0x142/0xc00 fs/fs-writeback.c:2426
process_one_work+0xa23/0x19a0 kernel/workqueue.c:3276
process_scheduled_works kernel/workqueue.c:3359 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3440
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
ext4_writepages_down_read fs/ext4/ext4.h:1814 [inline]
ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3028
do_writepages+0x278/0x600 mm/page-writeback.c:2575
__writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1762
writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1881
write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2972
iput_final fs/inode.c:1956 [inline]
iput.part.0+0x7f3/0xf50 fs/inode.c:2015
iput+0x35/0x40 fs/inode.c:1981
ext4_xattr_block_set+0x1426/0x3660 fs/ext4/xattr.c:2151
ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline]
ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2832
__ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6342
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6385 [inline]
__ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6463
ext4_evict_inode+0x864/0x1990 fs/ext4/inode.c:265
evict+0x3c2/0xad0 fs/inode.c:846
iput_final fs/inode.c:1966 [inline]
iput.part.0+0x605/0xf50 fs/inode.c:2015
iput+0x35/0x40 fs/inode.c:1981
ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5693 [inline]
ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5816
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694
vfs_get_tree+0x92/0x320 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3763 [inline]
do_new_mount fs/namespace.c:3839 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4159
do_mount fs/namespace.c:4172 [inline]
__do_sys_mount fs/namespace.c:4361 [inline]
__se_sys_mount fs/namespace.c:4338 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4338
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ei->xattr_sem);
lock(&sbi->s_writepages_rwsem);
lock(&ei->xattr_sem);
rlock(&sbi->s_writepages_rwsem);
*** DEADLOCK ***
3 locks held by syz.6.1607/13879:
#0: ffff88803500e0e0 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: alloc_super+0x244/0xd20 fs/super.c:345
#1: ffff88803500e610 (sb_internal){++++}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:846
#2: ffff888050a12728 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
#2: ffff888050a12728 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6382 [inline]
#2: ffff888050a12728 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x606/0x8b0 fs/ext4/inode.c:6463
stack backtrace:
CPU: 0 UID: 0 PID: 13879 Comm: syz.6.1607 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
ext4_writepages_down_read fs/ext4/ext4.h:1814 [inline]
ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3028
do_writepages+0x278/0x600 mm/page-writeback.c:2575
__writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1762
writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1881
write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2972
iput_final fs/inode.c:1956 [inline]
iput.part.0+0x7f3/0xf50 fs/inode.c:2015
iput+0x35/0x40 fs/inode.c:1981
ext4_xattr_block_set+0x1426/0x3660 fs/ext4/xattr.c:2151
ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline]
ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2832
__ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6342
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6385 [inline]
__ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6463
ext4_evict_inode+0x864/0x1990 fs/ext4/inode.c:265
evict+0x3c2/0xad0 fs/inode.c:846
iput_final fs/inode.c:1966 [inline]
iput.part.0+0x605/0xf50 fs/inode.c:2015
iput+0x35/0x40 fs/inode.c:1981
ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5693 [inline]
ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5816
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694
vfs_get_tree+0x92/0x320 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3763 [inline]
do_new_mount fs/namespace.c:3839 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4159
do_mount fs/namespace.c:4172 [inline]
__do_sys_mount fs/namespace.c:4361 [inline]
__se_sys_mount fs/namespace.c:4338 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4338
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f481f99da8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4820804e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4820804ee0 RCX: 00007f481f99da8a
RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f4820804ea0
RBP: 0000200000000180 R08: 00007f4820804ee0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f4820804ea0 R14: 000000000000047a R15: 00002000000001c0
------------[ cut here ]------------
EA inode 11 i_nlink=0
WARNING: fs/ext4/xattr.c:1057 at ext4_xattr_inode_update_ref+0x477/0x590 fs/ext4/xattr.c:1057, CPU#0: syz.6.1607/13879
Modules linked in:
CPU: 0 UID: 0 PID: 13879 Comm: syz.6.1607 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:ext4_xattr_inode_update_ref+0x47e/0x590 fs/ext4/xattr.c:1057
Code: 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0a 01 00 00 48 8d 3d 19 40 fe 0d 48 8b 73 40 44 89 e2 <67> 48 0f b9 3a eb a6 e8 76 7d 26 ff 48 8d 7b 40 48 b8 00 00 00 00
RSP: 0018:ffffc90009e77180 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888055fccf58 RCX: ffffc90011fcb000
RDX: 0000000000000000 RSI: 000000000000000b RDI: ffffffff90e09910
RBP: ffffc90009e77248 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 1ffff920013cee33 R14: 00000000ffffffff R15: 0000000000000000
FS: 00007f48208056c0(0000) GS:ffff888124339000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78369e92f8 CR3: 000000004af21000 CR4: 0000000000350ef0
Call Trace:
ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1082 [inline]
ext4_xattr_set_entry+0x185b/0x20b0 fs/ext4/xattr.c:1724
ext4_xattr_ibody_set+0x3d3/0x5d0 fs/ext4/xattr.c:2273
ext4_xattr_move_to_block fs/ext4/xattr.c:2676 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline]
ext4_expand_extra_isize_ea+0x180d/0x1d70 fs/ext4/xattr.c:2832
__ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6342
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6385 [inline]
__ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6463
ext4_evict_inode+0x864/0x1990 fs/ext4/inode.c:265
evict+0x3c2/0xad0 fs/inode.c:846
iput_final fs/inode.c:1966 [inline]
iput.part.0+0x605/0xf50 fs/inode.c:2015
iput+0x35/0x40 fs/inode.c:1981
ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5693 [inline]
ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5816
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694
vfs_get_tree+0x92/0x320 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3763 [inline]
do_new_mount fs/namespace.c:3839 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4159
do_mount fs/namespace.c:4172 [inline]
__do_sys_mount fs/namespace.c:4361 [inline]
__se_sys_mount fs/namespace.c:4338 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4338
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f481f99da8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4820804e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4820804ee0 RCX: 00007f481f99da8a
RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f4820804ea0
RBP: 0000200000000180 R08: 00007f4820804ee0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f4820804ea0 R14: 000000000000047a R15: 00002000000001c0
----------------
Code disassembly (best guess):
0: 40 rex
1: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
8: fc ff df
b: 48 89 fa mov %rdi,%rdx
e: 48 c1 ea 03 shr $0x3,%rdx
12: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
16: 0f 85 0a 01 00 00 jne 0x126
1c: 48 8d 3d 19 40 fe 0d lea 0xdfe4019(%rip),%rdi # 0xdfe403c
23: 48 8b 73 40 mov 0x40(%rbx),%rsi
27: 44 89 e2 mov %r12d,%edx
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: eb a6 jmp 0xffffffd7
31: e8 76 7d 26 ff call 0xff267dac
36: 48 8d 7b 40 lea 0x40(%rbx),%rdi
3a: 48 rex.W
3b: b8 00 00 00 00 mov $0x0,%eax