loop4: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.5159/17512 is trying to acquire lock: ffff88807b2f2c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2575 but task is already holding lock: ffff8880694000c0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff8880694000c0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6474 [inline] ffff8880694000c0 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5f0/0x890 fs/ext4/inode.c:6555 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->xattr_sem){++++}-{4:4}: down_read+0x99/0x450 kernel/locking/rwsem.c:1568 ext4_setattr+0x80f/0x2800 fs/ext4/inode.c:5934 notify_change+0xb25/0x1330 fs/attr.c:556 chown_common+0x51e/0x6e0 fs/open.c:776 do_fchownat+0x18e/0x1f0 fs/open.c:804 __do_sys_chown fs/open.c:824 [inline] __se_sys_chown fs/open.c:822 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:822 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (jbd2_handle){++++}-{0:0}: wait_transaction_locked+0x191/0x230 fs/jbd2/transaction.c:151 add_transaction_credits+0x110/0xe60 fs/jbd2/transaction.c:222 start_this_handle+0x3de/0x13a0 fs/jbd2/transaction.c:403 jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:502 __ext4_journal_start_sb+0x36d/0x670 fs/ext4/ext4_jbd2.c:114 __ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline] ext4_do_writepages+0xc21/0x3f20 fs/ext4/inode.c:2930 ext4_writepages+0x347/0x790 fs/ext4/inode.c:3042 do_writepages+0x278/0x600 mm/page-writeback.c:2575 __writeback_single_inode+0x164/0x1350 fs/fs-writeback.c:1764 writeback_sb_inodes+0x766/0x1c60 fs/fs-writeback.c:2056 __writeback_inodes_wb+0xf8/0x2d0 fs/fs-writeback.c:2132 wb_writeback+0x720/0xb90 fs/fs-writeback.c:2243 wb_check_old_data_flush fs/fs-writeback.c:2347 [inline] wb_do_writeback fs/fs-writeback.c:2400 [inline] wb_workfn+0x8dd/0xc00 fs/fs-writeback.c:2428 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #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+0x1b1/0x370 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:1811 [inline] ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3041 do_writepages+0x278/0x600 mm/page-writeback.c:2575 __writeback_single_inode+0x164/0x1350 fs/fs-writeback.c:1764 writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1883 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2974 iput_final fs/inode.c:1950 [inline] iput.part.0+0x7f3/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 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:6434 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline] __ext4_mark_inode_dirty+0x67d/0x890 fs/ext4/inode.c:6555 ext4_evict_inode+0x846/0x1a30 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:841 iput_final fs/inode.c:1960 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5701 [inline] ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5824 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:3758 [inline] do_new_mount fs/namespace.c:3834 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4154 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount fs/namespace.c:4360 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4360 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &sbi->s_writepages_rwsem --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.4.5159/17512: #0: ffff888032d840d8 (&type->s_umount_key#29/1){+.+.}-{4:4}, at: alloc_super+0x244/0xd20 fs/super.c:345 #1: ffff888032d84600 (sb_internal){.+.+}-{0:0}, at: evict+0x3c2/0xad0 fs/inode.c:841 #2: ffff8880694000c0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff8880694000c0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6474 [inline] #2: ffff8880694000c0 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x5f0/0x890 fs/ext4/inode.c:6555 stack backtrace: CPU: 0 UID: 0 PID: 17512 Comm: syz.4.5159 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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+0x1b1/0x370 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:1811 [inline] ext4_writepages+0x21d/0x790 fs/ext4/inode.c:3041 do_writepages+0x278/0x600 mm/page-writeback.c:2575 __writeback_single_inode+0x164/0x1350 fs/fs-writeback.c:1764 writeback_single_inode+0x4d3/0xf30 fs/fs-writeback.c:1883 write_inode_now+0x174/0x1f0 fs/fs-writeback.c:2974 iput_final fs/inode.c:1950 [inline] iput.part.0+0x7f3/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 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:6434 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline] __ext4_mark_inode_dirty+0x67d/0x890 fs/ext4/inode.c:6555 ext4_evict_inode+0x846/0x1a30 fs/ext4/inode.c:267 evict+0x3c2/0xad0 fs/inode.c:841 iput_final fs/inode.c:1960 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 ext4_orphan_cleanup+0x71e/0x11e0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5701 [inline] ext4_fill_super+0x916c/0xb5d0 fs/ext4/super.c:5824 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:3758 [inline] do_new_mount fs/namespace.c:3834 [inline] path_mount+0x7d0/0x23d0 fs/namespace.c:4154 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount fs/namespace.c:4360 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4360 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f19db99e04a 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:00007f19dc87ae58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f19dc87aee0 RCX: 00007f19db99e04a RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f19dc87aea0 RBP: 0000200000000180 R08: 00007f19dc87aee0 R09: 0000000000800700 R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0 R13: 00007f19dc87aea0 R14: 000000000000047d R15: 00002000000007c0 EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #11: comm syz.4.5159: iget: bad extra_isize 90 (inode size 256) loop4: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop4): ext4_xattr_inode_iget:444: comm syz.4.5159: error while reading EA inode 11 err=-117 loop4: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #11: comm syz.4.5159: iget: bad extra_isize 90 (inode size 256) loop4: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop4): ext4_xattr_inode_iget:444: comm syz.4.5159: error while reading EA inode 11 err=-117 loop4: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #18: comm syz.4.5159: iget: bad extra_isize 90 (inode size 256) loop4: lost file I/O error report for ino 18 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop4): ext4_xattr_inode_iget:444: comm syz.4.5159: error while reading EA inode 18 err=-117 loop4: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop4): ext4_xattr_inode_iget:441: inode #18: comm syz.4.5159: iget: bad extra_isize 90 (inode size 256) loop4: lost file I/O error report for ino 18 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop4): ext4_xattr_inode_iget:444: comm syz.4.5159: error while reading EA inode 18 err=-117 loop4: lost filesystem error report for type 5 error -117 EXT4-fs (loop4): 1 orphan inode deleted EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.