loop0: detected capacity change from 0 to 512
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.1516/3372 is trying to acquire lock:
ffff888029c1ac58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
ffff888029c1ac58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1820 [inline]
ffff888029c1ac58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x205/0x3b0 fs/ext4/inode.c:3025
but task is already holding lock:
ffff888069340ca0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
ffff888069340ca0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6389 [inline]
ffff888069340ca0 (&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:
-> #1 (&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_destroy_inline_data+0x28/0xe0 fs/ext4/inline.c:1797
ext4_do_writepages+0x521/0x4600 fs/ext4/inode.c:2811
ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3026
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
filemap_writeback mm/filemap.c:387 [inline]
filemap_fdatawrite_range mm/filemap.c:412 [inline]
file_write_and_wait_range+0x374/0x440 mm/filemap.c:786
generic_buffers_fsync_noflush+0x73/0x1d0 fs/buffer.c:609
ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
ext4_sync_file+0x32a/0xae0 fs/ext4/fsync.c:147
generic_write_sync include/linux/fs.h:2618 [inline]
ext4_buffered_write_iter+0x2ce/0x3a0 fs/ext4/file.c:305
ext4_file_write_iter+0x299/0x1c20 fs/ext4/file.c:-1
do_iter_readv_writev+0x62b/0x8d0 fs/read_write.c:-1
vfs_writev+0x345/0x9a0 fs/read_write.c:1057
do_pwritev fs/read_write.c:1153 [inline]
__do_sys_pwritev2 fs/read_write.c:1211 [inline]
__se_sys_pwritev2+0x187/0x2b0 fs/read_write.c:1202
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 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+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x330 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+0x205/0x3b0 fs/ext4/inode.c:3025
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
__writeback_single_inode+0x133/0x1230 fs/fs-writeback.c:1737
writeback_single_inode+0x488/0xd60 fs/fs-writeback.c:1858
write_inode_now+0x1c2/0x290 fs/fs-writeback.c:2937
iput_final fs/inode.c:1944 [inline]
iput+0xa73/0x1020 fs/inode.c:2006
ext4_xattr_block_set+0x1fd4/0x2ad0 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+0x12cf/0x1ea0 fs/ext4/xattr.c:2832
__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+0x7a1/0xe60 fs/ext4/inode.c:253
evict+0x61e/0xb10 fs/inode.c:837
ext4_orphan_cleanup+0xc38/0x1470 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5658 [inline]
ext4_fill_super+0x593e/0x6200 fs/ext4/super.c:5777
get_tree_bdev_flags+0x431/0x4f0 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+0x329/0xa50 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 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.0.1516/3372:
#0: ffff8880341c00d0 (&type->s_umount_key#27/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xab0 fs/super.c:344
#1: ffff8880341c0770 (sb_internal){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff8880341c0770 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff8880341c0770 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs/super.h:177 [inline]
#1: ffff8880341c0770 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x274/0xe60 fs/ext4/inode.c:214
#2: ffff888069340ca0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline]
#2: ffff888069340ca0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6389 [inline]
#2: ffff888069340ca0 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3db/0x6e0 fs/ext4/inode.c:6470
stack backtrace:
CPU: 1 UID: 0 PID: 3372 Comm: syz.0.1516 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_circular_bug+0x2e1/0x300 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+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x330 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+0x205/0x3b0 fs/ext4/inode.c:3025
do_writepages+0x32e/0x550 mm/page-writeback.c:2598
__writeback_single_inode+0x133/0x1230 fs/fs-writeback.c:1737
writeback_single_inode+0x488/0xd60 fs/fs-writeback.c:1858
write_inode_now+0x1c2/0x290 fs/fs-writeback.c:2937
iput_final fs/inode.c:1944 [inline]
iput+0xa73/0x1020 fs/inode.c:2006
ext4_xattr_block_set+0x1fd4/0x2ad0 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+0x12cf/0x1ea0 fs/ext4/xattr.c:2832
__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+0x7a1/0xe60 fs/ext4/inode.c:253
evict+0x61e/0xb10 fs/inode.c:837
ext4_orphan_cleanup+0xc38/0x1470 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5658 [inline]
ext4_fill_super+0x593e/0x6200 fs/ext4/super.c:5777
get_tree_bdev_flags+0x431/0x4f0 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+0x329/0xa50 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c8f88c14a
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:00007f6c8dae5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6c8dae5ee0 RCX: 00007f6c8f88c14a
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f6c8dae5ea0
RBP: 0000200000000180 R08: 00007f6c8dae5ee0 R09: 0000000000800700
R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007f6c8dae5ea0 R14: 000000000000046f R15: 000000000000002c
------------[ cut here ]------------
EA inode 11 i_nlink=0
WARNING: fs/ext4/xattr.c:1059 at ext4_xattr_inode_update_ref+0x4c9/0x5a0 fs/ext4/xattr.c:1057, CPU#1: syz.0.1516/3372
Modules linked in:
CPU: 1 UID: 0 PID: 3372 Comm: syz.0.1516 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:ext4_xattr_inode_update_ref+0x511/0x5a0 fs/ext4/xattr.c:1057
Code: 74 08 4c 89 ef e8 9f 3a 9d 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 59 fe ff ff e8 bb ff 82 08 44 89
RSP: 0018:ffffc9000aeb7100 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 000000000000000b RDI: ffffffff8f4e06f0
RBP: ffffc9000aeb7200 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100d2686a0 R12: ffffffff8f4e06f0
R13: 000000000000000b R14: 1ffff1100d268664 R15: ffff888069343320
FS: 00007f6c8dae66c0(0000) GS:ffff8881266c9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ed6838440 CR3: 00000000a6bc6000 CR4: 00000000003526f0
Call Trace:
ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1082 [inline]
ext4_xattr_set_entry+0xabb/0x1e20 fs/ext4/xattr.c:1724
ext4_xattr_ibody_set+0x254/0x6a0 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+0x13a2/0x1ea0 fs/ext4/xattr.c:2832
__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+0x7a1/0xe60 fs/ext4/inode.c:253
evict+0x61e/0xb10 fs/inode.c:837
ext4_orphan_cleanup+0xc38/0x1470 fs/ext4/orphan.c:472
__ext4_fill_super fs/ext4/super.c:5658 [inline]
ext4_fill_super+0x593e/0x6200 fs/ext4/super.c:5777
get_tree_bdev_flags+0x431/0x4f0 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+0x329/0xa50 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c8f88c14a
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:00007f6c8dae5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6c8dae5ee0 RCX: 00007f6c8f88c14a
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f6c8dae5ea0
RBP: 0000200000000180 R08: 00007f6c8dae5ee0 R09: 0000000000800700
R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007f6c8dae5ea0 R14: 000000000000046f R15: 000000000000002c
----------------
Code disassembly (best guess):
0: 74 08 je 0xa
2: 4c 89 ef mov %r13,%rdi
5: e8 9f 3a 9d ff call 0xff9d3aa9
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 59 fe ff ff jmp 0xfffffe92
39: e8 bb ff 82 08 call 0x882fff9
3e: 44 rex.R
3f: 89 .byte 0x89