loop6: detected capacity change from 0 to 512
EXT4-fs: Ignoring removed nobh option
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.6.2842/15133 is trying to acquire lock:
ffff888079d6ab98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2554
but task is already holding lock:
ffff888052cdea50 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
ffff888052cdea50 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6337 [inline]
ffff888052cdea50 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x606/0x8b0 fs/ext4/inode.c:6418
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:1797
ext4_do_writepages+0x1185/0x3f50 fs/ext4/inode.c:2804
ext4_writepages+0x347/0x790 fs/ext4/inode.c:3019
do_writepages+0x278/0x600 mm/page-writeback.c:2554
filemap_writeback+0x22d/0x2e0 mm/filemap.c:387
filemap_fdatawrite_range mm/filemap.c:412 [inline]
file_write_and_wait_range+0xcd/0x140 mm/filemap.c:786
generic_buffers_fsync_noflush+0x77/0x490 fs/buffer.c:606
ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
ext4_sync_file+0x63e/0xf10 fs/ext4/fsync.c:147
vfs_fsync_range+0x9b/0x190 fs/sync.c:186
generic_write_sync include/linux/fs.h:2640 [inline]
ext4_buffered_write_iter+0x2e2/0x440 fs/ext4/file.c:306
ext4_file_write_iter+0xa2f/0x1d40 fs/ext4/file.c:719
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1070 fs/read_write.c:688
ksys_pwrite64 fs/read_write.c:795 [inline]
__do_sys_pwrite64 fs/read_write.c:803 [inline]
__se_sys_pwrite64 fs/read_write.c:800 [inline]
__x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:800
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
-> #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:1813 [inline]
ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3018
do_writepages+0x278/0x600 mm/page-writeback.c:2554
__writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1749
writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1868
write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2953
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+0x6f7/0x3660 fs/ext4/xattr.c:2204
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:6297
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6340 [inline]
__ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6418
ext4_evict_inode+0x860/0x17c0 fs/ext4/inode.c:255
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:5668 [inline]
ext4_fill_super+0x9009/0xb470 fs/ext4/super.c:5791
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:3760 [inline]
do_new_mount fs/namespace.c:3836 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4146
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount fs/namespace.c:4325 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4325
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.6.2842/15133:
#0: ffff888089dcc0e0 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: alloc_super+0x244/0xd20 fs/super.c:345
#1: ffff888089dcc610 (sb_internal){++++}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:846
#2: ffff888052cdea50 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
#2: ffff888052cdea50 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6337 [inline]
#2: ffff888052cdea50 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x606/0x8b0 fs/ext4/inode.c:6418
stack backtrace:
CPU: 0 UID: 0 PID: 15133 Comm: syz.6.2842 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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:1813 [inline]
ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3018
do_writepages+0x278/0x600 mm/page-writeback.c:2554
__writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1749
writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1868
write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2953
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+0x6f7/0x3660 fs/ext4/xattr.c:2204
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:6297
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6340 [inline]
__ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6418
ext4_evict_inode+0x860/0x17c0 fs/ext4/inode.c:255
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:5668 [inline]
ext4_fill_super+0x9009/0xb470 fs/ext4/super.c:5791
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:3760 [inline]
do_new_mount fs/namespace.c:3836 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4146
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount fs/namespace.c:4325 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4325
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: 0033:0x7f3f19b9d8ca
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:00007f3f1aacde58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3f1aacdee0 RCX: 00007f3f19b9d8ca
RDX: 0000200000000180 RSI: 0000200000000140 RDI: 00007f3f1aacdea0
RBP: 0000200000000180 R08: 00007f3f1aacdee0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 0000200000000140
R13: 00007f3f1aacdea0 R14: 00000000000004a3 R15: 00002000000003c0
------------[ cut here ]------------
EA inode 11 i_nlink=1026
WARNING: fs/ext4/xattr.c:1057 at ext4_xattr_inode_update_ref+0x477/0x590 fs/ext4/xattr.c:1057, CPU#1: syz.6.2842/15133
Modules linked in:
CPU: 1 UID: 0 PID: 15133 Comm: syz.6.2842 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 e9 7d fe 0d 48 8b 73 40 44 89 e2 <67> 48 0f b9 3a eb a6 e8 c6 df 26 ff 48 8d 7b 40 48 b8 00 00 00 00
RSP: 0018:ffffc9000df57188 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888077613c28 RCX: ffffc9001f7d5000
RDX: 0000000000000402 RSI: 000000000000000b RDI: ffffffff90e01c50
RBP: ffffc9000df57250 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000402 R11: 0000000000000001 R12: 0000000000000402
R13: 1ffff92001beae34 R14: 00000000ffffffff R15: 0000000000000000
FS: 00007f3f1aace6c0(0000) GS:ffff88812444a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555573162a28 CR3: 00000000b0197000 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:6297
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6340 [inline]
__ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6418
ext4_evict_inode+0x860/0x17c0 fs/ext4/inode.c:255
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:5668 [inline]
ext4_fill_super+0x9009/0xb470 fs/ext4/super.c:5791
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:3760 [inline]
do_new_mount fs/namespace.c:3836 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4146
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount fs/namespace.c:4325 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4325
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: 0033:0x7f3f19b9d8ca
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:00007f3f1aacde58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3f1aacdee0 RCX: 00007f3f19b9d8ca
RDX: 0000200000000180 RSI: 0000200000000140 RDI: 00007f3f1aacdea0
RBP: 0000200000000180 R08: 00007f3f1aacdee0 R09: 0000000000800718
R10: 0000000000800718 R11: 0000000000000246 R12: 0000200000000140
R13: 00007f3f1aacdea0 R14: 00000000000004a3 R15: 00002000000003c0
----------------
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 e9 7d fe 0d lea 0xdfe7de9(%rip),%rdi # 0xdfe7e0c
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 c6 df 26 ff call 0xff26dffc
36: 48 8d 7b 40 lea 0x40(%rbx),%rdi
3a: 48 rex.W
3b: b8 00 00 00 00 mov $0x0,%eax