loop2: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.2.1934/15149 is trying to acquire lock: ffff88807c760c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2571 but task is already holding lock: ffff888052bf5e80 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff888052bf5e80 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6526 [inline] ffff888052bf5e80 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5db/0x880 fs/ext4/inode.c:6607 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{4:4}: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_destroy_inline_data+0x2d/0xe0 fs/ext4/inline.c:1805 ext4_do_writepages+0x1185/0x3ed0 fs/ext4/inode.c:2828 ext4_writepages+0x347/0x750 fs/ext4/inode.c:3043 do_writepages+0x278/0x600 mm/page-writeback.c:2571 filemap_writeback+0x22d/0x2e0 mm/filemap.c:387 ext4_convert_inline_data+0x474/0x610 fs/ext4/inline.c:1972 ext4_page_mkwrite+0x343/0x1850 fs/ext4/inode.c:6809 do_page_mkwrite+0x17a/0x440 mm/memory.c:3684 wp_page_shared mm/memory.c:4085 [inline] do_wp_page+0xa77/0x4350 mm/memory.c:4304 handle_pte_fault mm/memory.c:6395 [inline] __handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6517 handle_mm_fault+0x37b/0xa30 mm/memory.c:6686 do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:302 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0x38c/0x1720 lib/iov_iter.c:197 copy_page_to_iter lib/iov_iter.c:374 [inline] copy_page_to_iter+0x285/0x370 lib/iov_iter.c:361 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x7a9/0x10a0 mm/filemap.c:2865 generic_file_read_iter+0x344/0x450 mm/filemap.c:3006 ext4_file_read_iter+0x1dd/0x6c0 fs/ext4/file.c:147 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x82e/0xb40 fs/read_write.c:574 ksys_read+0x12a/0x250 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 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:1876 [inline] ext4_writepages+0x21d/0x750 fs/ext4/inode.c:3042 do_writepages+0x278/0x600 mm/page-writeback.c:2571 __writeback_single_inode+0x164/0x1300 fs/fs-writeback.c:1787 writeback_single_inode+0x51c/0xfc0 fs/fs-writeback.c:1906 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:3060 iput_final fs/inode.c:2009 [inline] iput.part.0+0x62a/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_xattr_block_set+0x6f7/0x3660 fs/ext4/xattr.c:2206 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline] ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6486 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6529 [inline] __ext4_mark_inode_dirty+0x668/0x880 fs/ext4/inode.c:6607 ext4_evict_inode+0x835/0x1960 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:825 iput_final fs/inode.c:2019 [inline] iput.part.0+0x989/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5705 [inline] ext4_fill_super+0x917f/0xb470 fs/ext4/super.c:5828 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1634 vfs_get_tree+0x92/0x320 fs/super.c:1694 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount fs/namespace.c:3841 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4161 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount fs/namespace.c:4367 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 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.2.1934/15149: #0: ffff8880506ca0d8 (&type->s_umount_key#29/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline] #0: ffff8880506ca0d8 (&type->s_umount_key#29/1){+.+.}-{4:4}, at: sget_fc+0x3c8/0x1d80 fs/super.c:766 #1: ffff8880506ca640 (sb_internal){.+.+}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:825 #2: ffff888052bf5e80 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff888052bf5e80 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6526 [inline] #2: ffff888052bf5e80 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5db/0x880 fs/ext4/inode.c:6607 stack backtrace: CPU: 0 UID: 0 PID: 15149 Comm: syz.2.1934 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 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+0xeb/0xe60 kernel/locking/lockdep.c:3165 check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x1b9/0x370 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:1876 [inline] ext4_writepages+0x21d/0x750 fs/ext4/inode.c:3042 do_writepages+0x278/0x600 mm/page-writeback.c:2571 __writeback_single_inode+0x164/0x1300 fs/fs-writeback.c:1787 writeback_single_inode+0x51c/0xfc0 fs/fs-writeback.c:1906 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:3060 iput_final fs/inode.c:2009 [inline] iput.part.0+0x62a/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_xattr_block_set+0x6f7/0x3660 fs/ext4/xattr.c:2206 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline] ext4_expand_extra_isize_ea+0x17c6/0x1d70 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:6486 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6529 [inline] __ext4_mark_inode_dirty+0x668/0x880 fs/ext4/inode.c:6607 ext4_evict_inode+0x835/0x1960 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:825 iput_final fs/inode.c:2019 [inline] iput.part.0+0x989/0x1050 fs/inode.c:2068 iput+0x35/0x40 fs/inode.c:2034 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5705 [inline] ext4_fill_super+0x917f/0xb470 fs/ext4/super.c:5828 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1634 vfs_get_tree+0x92/0x320 fs/super.c:1694 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount fs/namespace.c:3841 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4161 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount fs/namespace.c:4367 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f201239f10a 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:00007f201327ae58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f201327aee0 RCX: 00007f201239f10a RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f201327aea0 RBP: 0000200000000180 R08: 00007f201327aee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f201327aea0 R14: 000000000000047a R15: 000000000000002c EXT4-fs error (device loop2): ext4_xattr_inode_iget:441: inode #11: comm syz.2.1934: iget: bad extra_isize 90 (inode size 256) loop2: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs warning (device loop2): ext4_evict_inode:269: couldn't mark inode dirty (err -30) EXT4-fs (loop2): 1 orphan inode deleted EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.