loop0: detected capacity change from 0 to 512
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/6047 is trying to acquire lock:
ffff88803c5b2c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
ffff88803c5b2c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1820 [inline]
ffff88803c5b2c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1ca/0x350 fs/ext4/inode.c:3025
but task is already holding lock:
ffff888053512470 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
ffff888053512470 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6389 [inline]
ffff888053512470 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3db/0x6e0 fs/ext4/inode.c:6470
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&ei->xattr_sem){++++}-{4:4}:
down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
ext4_xattr_set_handle+0x165/0x1590 fs/ext4/xattr.c:2371
ext4_initxattrs+0x9f/0x110 fs/ext4/xattr_security.c:44
security_inode_init_security+0x290/0x3d0 security/security.c:1344
__ext4_new_inode+0x32f7/0x3c90 fs/ext4/ialloc.c:1324
ext4_create+0x22d/0x460 fs/ext4/namei.c:2820
lookup_open fs/namei.c:4440 [inline]
open_last_lookups fs/namei.c:4540 [inline]
path_openat+0x18d1/0x3df0 fs/namei.c:4784
do_filp_open+0x1fa/0x410 fs/namei.c:4814
do_sys_openat2+0x121/0x200 fs/open.c:1430
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1447
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (jbd2_handle){++++}-{0:0}:
wait_transaction_locked+0x1b6/0x270 fs/jbd2/transaction.c:151
add_transaction_credits fs/jbd2/transaction.c:222 [inline]
start_this_handle+0x77d/0x21c0 fs/jbd2/transaction.c:403
jbd2__journal_start+0x2c1/0x5b0 fs/jbd2/transaction.c:501
__ext4_journal_start_sb+0x203/0x580 fs/ext4/ext4_jbd2.c:114
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_do_writepages+0xf41/0x44f0 fs/ext4/inode.c:2914
ext4_writepages+0x203/0x350 fs/ext4/inode.c:3026
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
__writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737
writeback_sb_inodes+0x8c8/0x1840 fs/fs-writeback.c:2030
__writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2107
wb_writeback+0x43f/0xaa0 fs/fs-writeback.c:2218
wb_check_old_data_flush fs/fs-writeback.c:2322 [inline]
wb_do_writeback fs/fs-writeback.c:2375 [inline]
wb_workfn+0xad7/0xee0 fs/fs-writeback.c:2403
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
-> #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+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868
percpu_down_read_internal+0x48/0x1d0 include/linux/percpu-rwsem.h:53
percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
ext4_writepages_down_read fs/ext4/ext4.h:1820 [inline]
ext4_writepages+0x1ca/0x350 fs/ext4/inode.c:3025
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
__writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737
writeback_single_inode+0x488/0xd60 fs/fs-writeback.c:1858
write_inode_now+0x160/0x1d0 fs/fs-writeback.c:2924
iput_final fs/inode.c:1941 [inline]
iput+0xa77/0x1030 fs/inode.c:2003
ext4_xattr_block_set+0x1fce/0x2ac0 fs/ext4/xattr.c:2203
ext4_xattr_move_to_block fs/ext4/xattr.c:2668 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2743 [inline]
ext4_expand_extra_isize_ea+0x12da/0x1ea0 fs/ext4/xattr.c:2831
__ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6349
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6392 [inline]
__ext4_mark_inode_dirty+0x45c/0x6e0 fs/ext4/inode.c:6470
ext4_evict_inode+0x79c/0xe60 fs/ext4/inode.c:253
evict+0x5f4/0xae0 fs/inode.c:837
ext4_orphan_cleanup+0xc20/0x1460 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5658 [inline]
ext4_fill_super+0x58ad/0x6170 fs/ext4/super.c:5777
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
vfs_get_tree+0x92/0x2a0 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount+0x302/0xa10 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x313/0x410 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&sbi->s_writepages_rwsem --> jbd2_handle --> &ei->xattr_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ei->xattr_sem);
lock(jbd2_handle);
lock(&ei->xattr_sem);
rlock(&sbi->s_writepages_rwsem);
*** DEADLOCK ***
3 locks held by syz.0.17/6047:
#0: ffff88803c5b60d0 (&type->s_umount_key#27/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xab0 fs/super.c:344
#1: ffff88803c5b6770 (sb_internal){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff88803c5b6770 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff88803c5b6770 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs/super.h:177 [inline]
#1: ffff88803c5b6770 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x26f/0xe60 fs/ext4/inode.c:214
#2: ffff888053512470 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
#2: ffff888053512470 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6389 [inline]
#2: ffff888053512470 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3db/0x6e0 fs/ext4/inode.c:6470
stack backtrace:
CPU: 1 UID: 0 PID: 6047 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2043
check_noncircular+0x12e/0x150 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+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868
percpu_down_read_internal+0x48/0x1d0 include/linux/percpu-rwsem.h:53
percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
ext4_writepages_down_read fs/ext4/ext4.h:1820 [inline]
ext4_writepages+0x1ca/0x350 fs/ext4/inode.c:3025
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
__writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737
writeback_single_inode+0x488/0xd60 fs/fs-writeback.c:1858
write_inode_now+0x160/0x1d0 fs/fs-writeback.c:2924
iput_final fs/inode.c:1941 [inline]
iput+0xa77/0x1030 fs/inode.c:2003
ext4_xattr_block_set+0x1fce/0x2ac0 fs/ext4/xattr.c:2203
ext4_xattr_move_to_block fs/ext4/xattr.c:2668 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2743 [inline]
ext4_expand_extra_isize_ea+0x12da/0x1ea0 fs/ext4/xattr.c:2831
__ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6349
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6392 [inline]
__ext4_mark_inode_dirty+0x45c/0x6e0 fs/ext4/inode.c:6470
ext4_evict_inode+0x79c/0xe60 fs/ext4/inode.c:253
evict+0x5f4/0xae0 fs/inode.c:837
ext4_orphan_cleanup+0xc20/0x1460 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5658 [inline]
ext4_fill_super+0x58ad/0x6170 fs/ext4/super.c:5777
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
vfs_get_tree+0x92/0x2a0 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount+0x302/0xa10 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x313/0x410 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1717c10eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc904f8068 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc904f80f0 RCX: 00007f1717c10eea
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007ffc904f80b0
RBP: 0000200000000180 R08: 00007ffc904f80f0 R09: 0000000001800700
R10: 0000000001800700 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007ffc904f80b0 R14: 000000000000047c R15: 00002000000004c0
------------[ cut here ]------------
EA inode 11 i_nlink=2
WARNING: fs/ext4/xattr.c:1058 at ext4_xattr_inode_update_ref+0x494/0x570 fs/ext4/xattr.c:1056, CPU#0: syz.0.17/6047
Modules linked in:
CPU: 0 UID: 0 PID: 6047 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ext4_xattr_inode_update_ref+0x4dc/0x570 fs/ext4/xattr.c:1056
Code: 74 08 4c 89 ef e8 44 a6 9f ff 4d 8b 6d 00 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 06 84 c0 75 77 41 8b 17 4c 89 e7 4c 89 ee <67> 48 0f b9 3a 4c 8b 6c 24 28 e9 bd fe ff ff e8 00 62 50 08 44 89
RSP: 0018:ffffc9000402f100 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff1100a68fb16 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 000000000000000b RDI: ffffffff8ee143c0
RBP: ffffc9000402f1f8 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100a68fb17 R12: ffffffff8ee143c0
R13: 000000000000000b R14: 1ffff1100a68fadb R15: ffff88805347d6d8
FS: 0000555591722500(0000) GS:ffff888126d01000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc8ecaaa9c0 CR3: 00000000277ca000 CR4: 00000000003526f0
Call Trace:
ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1081 [inline]
ext4_xattr_set_entry+0xabb/0x1e20 fs/ext4/xattr.c:1723
ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2272
ext4_xattr_move_to_block fs/ext4/xattr.c:2675 [inline]
ext4_xattr_make_inode_space fs/ext4/xattr.c:2743 [inline]
ext4_expand_extra_isize_ea+0x13ad/0x1ea0 fs/ext4/xattr.c:2831
__ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6349
ext4_try_to_expand_extra_isize fs/ext4/inode.c:6392 [inline]
__ext4_mark_inode_dirty+0x45c/0x6e0 fs/ext4/inode.c:6470
ext4_evict_inode+0x79c/0xe60 fs/ext4/inode.c:253
evict+0x5f4/0xae0 fs/inode.c:837
ext4_orphan_cleanup+0xc20/0x1460 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5658 [inline]
ext4_fill_super+0x58ad/0x6170 fs/ext4/super.c:5777
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
vfs_get_tree+0x92/0x2a0 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount+0x302/0xa10 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x313/0x410 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1717c10eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc904f8068 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc904f80f0 RCX: 00007f1717c10eea
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007ffc904f80b0
RBP: 0000200000000180 R08: 00007ffc904f80f0 R09: 0000000001800700
R10: 0000000001800700 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007ffc904f80b0 R14: 000000000000047c R15: 00002000000004c0
----------------
Code disassembly (best guess):
0: 74 08 je 0xa
2: 4c 89 ef mov %r13,%rdi
5: e8 44 a6 9f ff call 0xff9fa64e
a: 4d 8b 6d 00 mov 0x0(%r13),%r13
e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
15: fc ff df
18: 41 0f b6 04 06 movzbl (%r14,%rax,1),%eax
1d: 84 c0 test %al,%al
1f: 75 77 jne 0x98
21: 41 8b 17 mov (%r15),%edx
24: 4c 89 e7 mov %r12,%rdi
27: 4c 89 ee mov %r13,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 4c 8b 6c 24 28 mov 0x28(%rsp),%r13
34: e9 bd fe ff ff jmp 0xfffffef6
39: e8 00 62 50 08 call 0x850623e
3e: 44 rex.R
3f: 89 .byte 0x89