loop8: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.8.2804/16410 is trying to acquire lock: ffff888077dc8b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1c0/0x2e50 fs/ext4/inode.c:2715 but task is already holding lock: ffff8880252aa8e8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] ffff8880252aa8e8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6019 [inline] ffff8880252aa8e8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3fe/0x770 fs/ext4/inode.c:6100 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_destroy_inline_data+0x24/0xe0 fs/ext4/inline.c:1922 ext4_writepages+0x5df/0x2e50 fs/ext4/inode.c:2761 do_writepages+0x3b7/0x610 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] file_write_and_wait_range+0x137/0x200 mm/filemap.c:774 ext4_sync_file+0x23b/0xca0 fs/ext4/fsync.c:151 generic_write_sync include/linux/fs.h:2962 [inline] ext4_buffered_write_iter+0x2f6/0x390 fs/ext4/file.c:292 ext4_file_write_iter+0x1d6/0x16e0 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __x64_sys_pwrite64+0x191/0x220 fs/read_write.c:706 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1c0/0x2e50 fs/ext4/inode.c:2715 do_writepages+0x3b7/0x610 mm/page-writeback.c:2491 __writeback_single_inode+0x156/0x1160 fs/fs-writeback.c:1622 writeback_single_inode+0x221/0x8b0 fs/fs-writeback.c:1743 write_inode_now+0x15d/0x1d0 fs/fs-writeback.c:2780 iput_final fs/inode.c:1821 [inline] iput+0x613/0x980 fs/inode.c:1860 ext4_xattr_block_set+0x2736/0x32a0 fs/ext4/xattr.c:2162 ext4_xattr_move_to_block fs/ext4/xattr.c:2630 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2705 [inline] ext4_expand_extra_isize_ea+0x109b/0x19b0 fs/ext4/xattr.c:2797 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5979 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6022 [inline] __ext4_mark_inode_dirty+0x47f/0x770 fs/ext4/inode.c:6100 ext4_evict_inode+0xa73/0x1100 fs/ext4/inode.c:279 evict+0x485/0x870 fs/inode.c:705 ext4_orphan_cleanup+0xbd3/0x1400 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x7738/0x7cd0 fs/ext4/super.c:5687 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 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(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.8.2804/16410: #0: ffff8880788200e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x930 fs/super.c:228 #1: ffff888078820650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] #1: ffff888078820650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] #1: ffff888078820650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x436/0x1100 fs/ext4/inode.c:240 #2: ffff8880252aa8e8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #2: ffff8880252aa8e8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6019 [inline] #2: ffff8880252aa8e8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3fe/0x770 fs/ext4/inode.c:6100 stack backtrace: CPU: 1 PID: 16410 Comm: syz.8.2804 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1c0/0x2e50 fs/ext4/inode.c:2715 do_writepages+0x3b7/0x610 mm/page-writeback.c:2491 __writeback_single_inode+0x156/0x1160 fs/fs-writeback.c:1622 writeback_single_inode+0x221/0x8b0 fs/fs-writeback.c:1743 write_inode_now+0x15d/0x1d0 fs/fs-writeback.c:2780 iput_final fs/inode.c:1821 [inline] iput+0x613/0x980 fs/inode.c:1860 ext4_xattr_block_set+0x2736/0x32a0 fs/ext4/xattr.c:2162 ext4_xattr_move_to_block fs/ext4/xattr.c:2630 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2705 [inline] ext4_expand_extra_isize_ea+0x109b/0x19b0 fs/ext4/xattr.c:2797 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5979 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6022 [inline] __ext4_mark_inode_dirty+0x47f/0x770 fs/ext4/inode.c:6100 ext4_evict_inode+0xa73/0x1100 fs/ext4/inode.c:279 evict+0x485/0x870 fs/inode.c:705 ext4_orphan_cleanup+0xbd3/0x1400 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x7738/0x7cd0 fs/ext4/super.c:5687 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f8cfd390eea 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:00007f8cfadafe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8cfadafef0 RCX: 00007f8cfd390eea RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f8cfadafeb0 RBP: 0000200000000180 R08: 00007f8cfadafef0 R09: 0000000000800700 R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0 R13: 00007f8cfadafeb0 R14: 000000000000046f R15: 000000000000002c EXT4-fs error (device loop8): ext4_xattr_inode_iget:404: inode #11: comm syz.8.2804: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs error (device loop8): ext4_xattr_inode_iget:409: comm syz.8.2804: error while reading EA inode 11 err=-117 EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs warning (device loop8): ext4_expand_extra_isize_ea:2823: Unable to expand inode 15. Delete some EAs or run e2fsck. EXT4-fs error (device loop8): ext4_xattr_inode_iget:404: inode #11: comm syz.8.2804: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs error (device loop8): ext4_xattr_inode_iget:409: comm syz.8.2804: error while reading EA inode 11 err=-117 EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs error (device loop8): ext4_xattr_inode_iget:404: inode #18: comm syz.8.2804: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs error (device loop8): ext4_xattr_inode_iget:409: comm syz.8.2804: error while reading EA inode 18 err=-117 EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs error (device loop8): ext4_xattr_inode_iget:404: inode #18: comm syz.8.2804: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs error (device loop8): ext4_xattr_inode_iget:409: comm syz.8.2804: error while reading EA inode 18 err=-117 EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs (loop8): 1 orphan inode deleted EXT4-fs (loop8): mounted filesystem without journal. Quota mode: none.