loop8: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.8.2226/12720 is trying to acquire lock: ffff888053d2cc18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2554 but task is already holding lock: ffff88803c8bba58 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff88803c8bba58 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6382 [inline] ffff88803c8bba58 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x606/0x8b0 fs/ext4/inode.c:6463 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:1805 ext4_do_writepages+0x1185/0x3f50 fs/ext4/inode.c:2814 ext4_writepages+0x347/0x790 fs/ext4/inode.c:3029 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.constprop.0+0xdd/0x430 fs/ext4/fsync.c:92 ext4_sync_file+0x8be/0xbc0 fs/ext4/fsync.c:159 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 iter_file_splice_write+0x830/0x10a0 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1159 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1228 do_sendfile+0xadc/0xe20 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64 fs/read_write.c:1419 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1419 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:1814 [inline] ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3028 do_writepages+0x278/0x600 mm/page-writeback.c:2554 __writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1762 writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1881 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2972 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+0x1426/0x3660 fs/ext4/xattr.c:2151 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:6342 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6385 [inline] __ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6463 ext4_evict_inode+0x864/0x1990 fs/ext4/inode.c:265 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:5693 [inline] ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5816 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:3763 [inline] do_new_mount fs/namespace.c:3839 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount fs/namespace.c:4338 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4338 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.8.2226/12720: #0: ffff88807cdb20e0 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: alloc_super+0x244/0xd20 fs/super.c:345 #1: ffff88807cdb2610 (sb_internal){.+.+}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:846 #2: ffff88803c8bba58 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff88803c8bba58 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6382 [inline] #2: ffff88803c8bba58 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x606/0x8b0 fs/ext4/inode.c:6463 stack backtrace: CPU: 0 UID: 0 PID: 12720 Comm: syz.8.2226 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:1814 [inline] ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3028 do_writepages+0x278/0x600 mm/page-writeback.c:2554 __writeback_single_inode+0x164/0x13c0 fs/fs-writeback.c:1762 writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1881 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2972 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+0x1426/0x3660 fs/ext4/xattr.c:2151 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:6342 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6385 [inline] __ext4_mark_inode_dirty+0x693/0x8b0 fs/ext4/inode.c:6463 ext4_evict_inode+0x864/0x1990 fs/ext4/inode.c:265 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:5693 [inline] ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5816 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:3763 [inline] do_new_mount fs/namespace.c:3839 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount fs/namespace.c:4338 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4338 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: 0033:0x7f950a99da8a 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:00007f950b831e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f950b831ee0 RCX: 00007f950a99da8a RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f950b831ea0 RBP: 0000200000000180 R08: 00007f950b831ee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f950b831ea0 R14: 000000000000047a R15: 0000200000000b40 EXT4-fs error (device loop8): ext4_xattr_inode_iget:441: inode #11: comm syz.8.2226: iget: bad extra_isize 58 (inode size 256) loop8: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop8): ext4_xattr_inode_iget:444: comm syz.8.2226: error while reading EA inode 11 err=-117 loop8: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop8): ext4_xattr_inode_iget:441: inode #11: comm syz.8.2226: iget: bad extra_isize 58 (inode size 256) loop8: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop8): ext4_xattr_inode_iget:444: comm syz.8.2226: error while reading EA inode 11 err=-117 loop8: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop8): ext4_xattr_inode_iget:441: inode #18: comm syz.8.2226: iget: bad extra_isize 58 (inode size 256) loop8: lost file I/O error report for ino 18 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop8): ext4_xattr_inode_iget:444: comm syz.8.2226: error while reading EA inode 18 err=-117 loop8: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop8): ext4_xattr_inode_iget:441: inode #18: comm syz.8.2226: iget: bad extra_isize 58 (inode size 256) loop8: lost file I/O error report for ino 18 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop8): ext4_xattr_inode_iget:444: comm syz.8.2226: error while reading EA inode 18 err=-117 loop8: lost filesystem error report for type 5 error -117 EXT4-fs (loop8): 1 orphan inode deleted EXT4-fs (loop8): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.