EXT4-fs (loop1): mounted filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /39/file1 supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.230/7387 is trying to acquire lock: ffff88807709e608 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1633 [inline] ffff88807709e608 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1755 [inline] ffff88807709e608 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2b4/0xe70 fs/ext4/inode.c:215 but task is already holding lock: ffff8880306d6c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_write fs/ext4/ext4.h:1780 [inline] ffff8880306d6c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x313/0x1060 fs/ext4/migrate.c:438 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}: 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 -> #0 (sb_internal){.+.+}-{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 __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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_writepages_rwsem); lock(sb_internal); lock(&sbi->s_writepages_rwsem); rlock(sb_internal); *** DEADLOCK *** 3 locks held by syz.1.230/7387: #0: ffff88807709e418 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x200 fs/namespace.c:456 #1: ffff88805dcaca10 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff88805dcaca10 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1417 [inline] #1: ffff88805dcaca10 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_ioctl+0x1ed6/0x3b70 fs/ext4/ioctl.c:1636 #2: ffff8880306d6c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_write fs/ext4/ext4.h:1780 [inline] #2: ffff8880306d6c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x313/0x1060 fs/ext4/migrate.c:438 stack backtrace: CPU: 1 PID: 7387 Comm: syz.1.230 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 __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 RIP: 0033:0x7faae399e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007faae489f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007faae3c25fa0 RCX: 00007faae399e0d9 RDX: 0000000000000000 RSI: 0000000000006609 RDI: 0000000000000005 RBP: 00007faae3a35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007faae3c26038 R14: 00007faae3c25fa0 R15: 00007ffe4fa6c598