loop4: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.168/6447 is trying to acquire lock: ffff8881463cec58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1768 [inline] ffff8881463cec58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1a4/0x350 fs/ext4/inode.c:2809 but task is already holding lock: ffff88805dc614c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] ffff88805dc614c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6031 [inline] ffff88805dc614c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3d3/0x6d0 fs/ext4/inode.c:6112 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->xattr_sem){++++}-{3:3}: down_write+0x97/0x200 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline] ext4_inline_data_truncate+0x1bb/0xbc0 fs/ext4/inline.c:1961 ext4_truncate+0x45e/0x1140 fs/ext4/inode.c:4235 ext4_evict_inode+0x897/0xe70 fs/ext4/inode.c:261 evict+0x4b7/0x8a0 fs/inode.c:705 __dentry_kill+0x412/0x630 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfe/0x1e0 fs/dcache.c:918 do_renameat2+0x8c0/0xc80 fs/namei.c:5082 __do_sys_rename fs/namei.c:5126 [inline] __se_sys_rename fs/namei.c:5124 [inline] __x64_sys_rename+0x86/0x90 fs/namei.c:5124 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 -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1633 [inline] sb_start_intwrite include/linux/fs.h:1755 [inline] ext4_evict_inode+0x2b4/0xe70 fs/ext4/inode.c:215 evict+0x4b7/0x8a0 fs/inode.c:705 ext4_ext_migrate+0xcd4/0x1060 fs/ext4/migrate.c:588 __ext4_ioctl fs/ext4/ioctl.c:1418 [inline] ext4_ioctl+0x1ede/0x3b70 fs/ext4/ioctl.c:1636 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 -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: 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+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 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:2809 do_writepages+0x351/0x590 mm/page-writeback.c:2575 __writeback_single_inode+0x14e/0xee0 fs/fs-writeback.c:1686 writeback_single_inode+0x21f/0x760 fs/fs-writeback.c:1807 write_inode_now+0x183/0x210 fs/fs-writeback.c:2859 iput_final fs/inode.c:1807 [inline] iput+0x58f/0x900 fs/inode.c:1846 ext4_xattr_block_set+0x248b/0x2fe0 fs/ext4/xattr.c:2201 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+0x128f/0x1e70 fs/ext4/xattr.c:2829 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5991 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6034 [inline] __ext4_mark_inode_dirty+0x458/0x6d0 fs/ext4/inode.c:6112 ext4_evict_inode+0x7dd/0xe70 fs/ext4/inode.c:254 evict+0x4b7/0x8a0 fs/inode.c:705 ext4_orphan_cleanup+0xc33/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5621 [inline] ext4_fill_super+0x5fb5/0x6870 fs/ext4/super.c:5744 get_tree_bdev+0x3e5/0x520 fs/super.c:1591 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24a/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 other info that might help us debug this: Chain exists of: &sbi->s_writepages_rwsem --> sb_internal --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(sb_internal); lock(&ei->xattr_sem); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.4.168/6447: #0: ffff888142b020e0 (&type->s_umount_key#31){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff888142b020e0 (&type->s_umount_key#31){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888142b020e0 (&type->s_umount_key#31){++++}-{3:3}, at: get_tree_bdev+0x345/0x520 fs/super.c:1589 #1: ffff888142b02608 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1633 [inline] #1: ffff888142b02608 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1755 [inline] #1: ffff888142b02608 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2b4/0xe70 fs/ext4/inode.c:215 #2: ffff88805dc614c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff88805dc614c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6031 [inline] #2: ffff88805dc614c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3d3/0x6d0 fs/ext4/inode.c:6112 stack backtrace: CPU: 0 PID: 6447 Comm: syz.4.168 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: 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+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 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:2809 do_writepages+0x351/0x590 mm/page-writeback.c:2575 __writeback_single_inode+0x14e/0xee0 fs/fs-writeback.c:1686 writeback_single_inode+0x21f/0x760 fs/fs-writeback.c:1807 write_inode_now+0x183/0x210 fs/fs-writeback.c:2859 iput_final fs/inode.c:1807 [inline] iput+0x58f/0x900 fs/inode.c:1846 ext4_xattr_block_set+0x248b/0x2fe0 fs/ext4/xattr.c:2201 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+0x128f/0x1e70 fs/ext4/xattr.c:2829 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5991 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6034 [inline] __ext4_mark_inode_dirty+0x458/0x6d0 fs/ext4/inode.c:6112 ext4_evict_inode+0x7dd/0xe70 fs/ext4/inode.c:254 evict+0x4b7/0x8a0 fs/inode.c:705 ext4_orphan_cleanup+0xc33/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5621 [inline] ext4_fill_super+0x5fb5/0x6870 fs/ext4/super.c:5744 get_tree_bdev+0x3e5/0x520 fs/super.c:1591 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24a/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 RIP: 0033:0x7fbaa7b9f34a 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:00007fbaa89cde58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbaa89cdee0 RCX: 00007fbaa7b9f34a RDX: 0000200000000240 RSI: 0000200000000000 RDI: 00007fbaa89cdea0 RBP: 0000200000000240 R08: 00007fbaa89cdee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007fbaa89cdea0 R14: 000000000000047a R15: 000000000000002c EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #11: comm syz.4.168: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop4): Remounting filesystem read-only EXT4-fs warning (device loop4): ext4_expand_extra_isize_ea:2855: Unable to expand inode 15. Delete some EAs or run e2fsck. EXT4-fs warning (device loop4): ext4_evict_inode:257: couldn't mark inode dirty (err -5) EXT4-fs (loop4): 1 orphan inode deleted EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.