======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.302/7463 is trying to acquire lock:
ffff88805d53d0c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline]
ffff88805d53d0c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x19d/0x14c0 fs/ext4/xattr.c:2369
but task is already holding lock:
ffff88807e4d8c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_write fs/ext4/ext4.h:1780 [inline]
ffff88807e4d8c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x321/0x1080 fs/ext4/migrate.c:438
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}:
percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51
ext4_writepages_down_read fs/ext4/ext4.h:1768 [inline]
ext4_writepages+0x1a4/0x350 fs/ext4/inode.c:2808
do_writepages+0x3b3/0x630 mm/page-writeback.c:2575
__writeback_single_inode+0x153/0xec0 fs/fs-writeback.c:1635
writeback_single_inode+0x21f/0x760 fs/fs-writeback.c:1756
write_inode_now+0x183/0x210 fs/fs-writeback.c:2808
iput_final fs/inode.c:1807 [inline]
iput+0x5ae/0x920 fs/inode.c:1846
ext4_xattr_block_set+0x249e/0x32b0 fs/ext4/xattr.c:2148
ext4_xattr_move_to_block fs/ext4/xattr.c:2666 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2741 [inline]
ext4_expand_extra_isize_ea+0x12c5/0x1e80 fs/ext4/xattr.c:2829
__ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5990
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6033 [inline]
__ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6111
ext4_evict_inode+0x7f3/0xea0 fs/ext4/inode.c:254
evict+0x4ca/0x8d0 fs/inode.c:705
ext4_orphan_cleanup+0xbec/0x1420 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5621 [inline]
ext4_fill_super+0x5eea/0x67b0 fs/ext4/super.c:5744
get_tree_bdev+0x3f3/0x520 fs/super.c:1591
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #0 (&ei->xattr_sem){++++}-{3:3}:
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+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
down_write+0x97/0x200 kernel/locking/rwsem.c:1573
ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline]
ext4_xattr_set_handle+0x19d/0x14c0 fs/ext4/xattr.c:2369
__ext4_set_acl+0x56f/0x650 fs/ext4/acl.c:217
ext4_init_acl+0x24d/0x330 fs/ext4/acl.c:297
__ext4_new_inode+0x2f27/0x3ac0 fs/ext4/ialloc.c:1332
ext4_ext_migrate+0x6f0/0x1080 fs/ext4/migrate.c:456
__ext4_ioctl fs/ext4/ioctl.c:1412 [inline]
ext4_ioctl+0x1ee3/0x3b80 fs/ext4/ioctl.c:1630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sbi->s_writepages_rwsem);
lock(&ei->xattr_sem);
lock(&sbi->s_writepages_rwsem);
lock(&ei->xattr_sem);
*** DEADLOCK ***
3 locks held by syz.1.302/7463:
#0: ffff88802f4a2418 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x200 fs/namespace.c:456
#1: ffff88805d539810 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#1: ffff88805d539810 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1411 [inline]
#1: ffff88805d539810 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_ioctl+0x1edb/0x3b80 fs/ext4/ioctl.c:1630
#2: ffff88807e4d8c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_write fs/ext4/ext4.h:1780 [inline]
#2: ffff88807e4d8c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x321/0x1080 fs/ext4/migrate.c:438
stack backtrace:
CPU: 1 PID: 7463 Comm: syz.1.302 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
check_noncircular+0x2fc/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+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
down_write+0x97/0x200 kernel/locking/rwsem.c:1573
ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline]
ext4_xattr_set_handle+0x19d/0x14c0 fs/ext4/xattr.c:2369
__ext4_set_acl+0x56f/0x650 fs/ext4/acl.c:217
ext4_init_acl+0x24d/0x330 fs/ext4/acl.c:297
__ext4_new_inode+0x2f27/0x3ac0 fs/ext4/ialloc.c:1332
ext4_ext_migrate+0x6f0/0x1080 fs/ext4/migrate.c:456
__ext4_ioctl fs/ext4/ioctl.c:1412 [inline]
ext4_ioctl+0x1ee3/0x3b80 fs/ext4/ioctl.c:1630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb11b59ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fb11c4f8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb11b816090 RCX: 00007fb11b59ce59
RDX: 0000000000000000 RSI: 0000000000006609 RDI: 0000000000000007
RBP: 00007fb11b632d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb11b816128 R14: 00007fb11b816090 R15: 00007ffef8dbc238
</TASK>
BUG: unable to handle page fault for address: ffffffffffffffec
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD cf35067 P4D cf35067 PUD cf37067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7463 Comm: syz.1.302 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:ext4_ext_drop_refs fs/ext4/extents.c:119 [inline]
RIP: 0010:ext4_free_ext_path+0x45/0x110 fs/ext4/extents.c:128
Code: 85 db 0f 84 b0 00 00 00 49 bf 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 a9 00 00 00 <0f> b7 43 08 c1 e0 04 48 8d 04 40 48 89 44 24 08 48 8d 43 28 48 89
RSP: 0018:ffffc9000bd77638 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffffffffffe4 RCX: 0000000000080000
RDX: ffffc9000e1be000 RSI: 000000000007ffff RDI: ffffffffffffffec
RBP: ffffc9000bd77758 R08: ffff88805d53d21f R09: 1ffff1100baa7a43
R10: dffffc0000000000 R11: ffffed100baa7a44 R12: ffff88805d53d2b0
R13: ffffffffffffffe4 R14: dffffc0000000000 R15: dffffc0000000000
FS: 00007fb11c4f86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffec CR3: 000000005c229000 CR4: 00000000003526f0
Call Trace:
<TASK>
finish_range+0x234/0x340 fs/ext4/migrate.c:60
update_extent_range fs/ext4/migrate.c:83 [inline]
update_ind_extent_range+0x2e3/0x520 fs/ext4/migrate.c:106
ext4_ext_migrate+0xb07/0x1080 fs/ext4/migrate.c:522
__ext4_ioctl fs/ext4/ioctl.c:1412 [inline]
ext4_ioctl+0x1ee3/0x3b80 fs/ext4/ioctl.c:1630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb11b59ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fb11c4f8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb11b816090 RCX: 00007fb11b59ce59
RDX: 0000000000000000 RSI: 0000000000006609 RDI: 0000000000000007
RBP: 00007fb11b632d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb11b816128 R14: 00007fb11b816090 R15: 00007ffef8dbc238
</TASK>
Modules linked in:
CR2: ffffffffffffffec
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_ext_drop_refs fs/ext4/extents.c:119 [inline]
RIP: 0010:ext4_free_ext_path+0x45/0x110 fs/ext4/extents.c:128
Code: 85 db 0f 84 b0 00 00 00 49 bf 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 a9 00 00 00 <0f> b7 43 08 c1 e0 04 48 8d 04 40 48 89 44 24 08 48 8d 43 28 48 89
RSP: 0018:ffffc9000bd77638 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffffffffffe4 RCX: 0000000000080000
RDX: ffffc9000e1be000 RSI: 000000000007ffff RDI: ffffffffffffffec
RBP: ffffc9000bd77758 R08: ffff88805d53d21f R09: 1ffff1100baa7a43
R10: dffffc0000000000 R11: ffffed100baa7a44 R12: ffff88805d53d2b0
R13: ffffffffffffffe4 R14: dffffc0000000000 R15: dffffc0000000000
FS: 00007fb11c4f86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffec CR3: 000000005c229000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 85 db test %ebx,%ebx
2: 0f 84 b0 00 00 00 je 0xb8
8: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
f: fc ff df
12: 48 8d 7b 08 lea 0x8(%rbx),%rdi
16: 48 89 f8 mov %rdi,%rax
19: 48 c1 e8 03 shr $0x3,%rax
1d: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
22: 84 c0 test %al,%al
24: 0f 85 a9 00 00 00 jne 0xd3
* 2a: 0f b7 43 08 movzwl 0x8(%rbx),%eax <-- trapping instruction
2e: c1 e0 04 shl $0x4,%eax
31: 48 8d 04 40 lea (%rax,%rax,2),%rax
35: 48 89 44 24 08 mov %rax,0x8(%rsp)
3a: 48 8d 43 28 lea 0x28(%rbx),%rax
3e: 48 rex.W
3f: 89 .byte 0x89