====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.117/7003 is trying to acquire lock: ffff0000ddd78b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ffff0000ddd78b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1796 [inline] ffff0000ddd78b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x150/0x2a0 fs/ext4/inode.c:3024 but task is already holding lock: ffff0000dd0c69f8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff0000dd0c69f8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6404 [inline] ffff0000dd0c69f8 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x358/0x6fc fs/ext4/inode.c:6485 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{4:4}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1590 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_xattr_set_handle+0x11c/0x1260 fs/ext4/xattr.c:2367 ext4_initxattrs+0xa4/0x11c fs/ext4/xattr_security.c:44 security_inode_init_security+0x6dc/0x7f4 security/security.c:1891 ext4_init_security+0x44/0x58 fs/ext4/xattr_security.c:58 __ext4_new_inode+0x27f4/0x3190 fs/ext4/ialloc.c:1325 ext4_ext_migrate+0x4b8/0xd10 fs/ext4/migrate.c:456 __ext4_ioctl fs/ext4/ioctl.c:1694 [inline] ext4_ioctl+0x1bb0/0x4130 fs/ext4/ioctl.c:1923 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #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+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 percpu_down_read_internal+0x5c/0x298 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1796 [inline] ext4_writepages+0x150/0x2a0 fs/ext4/inode.c:3024 do_writepages+0x270/0x468 mm/page-writeback.c:2604 __writeback_single_inode+0x15c/0x13e8 fs/fs-writeback.c:1719 writeback_single_inode+0x18c/0x54c fs/fs-writeback.c:1840 write_inode_now+0x13c/0x1a4 fs/fs-writeback.c:2903 iput_final fs/inode.c:1901 [inline] iput+0x7d4/0xad4 fs/inode.c:1966 ext4_xattr_block_set+0x13dc/0x24bc fs/ext4/xattr.c:2199 ext4_xattr_move_to_block fs/ext4/xattr.c:2664 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2739 [inline] ext4_expand_extra_isize_ea+0xeb8/0x1830 fs/ext4/xattr.c:2827 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6364 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6407 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6485 ext4_evict_inode+0x930/0x1084 fs/ext4/inode.c:254 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:356 ext4_orphan_cleanup+0x930/0x107c fs/ext4/orphan.c:470 __ext4_fill_super fs/ext4/super.c:5617 [inline] ext4_fill_super+0x4854/0x4fcc fs/ext4/super.c:5736 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691 get_tree_bdev+0x2c/0x3c fs/super.c:1714 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5768 vfs_get_tree+0x90/0x28c fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3727 path_mount+0x5b4/0xdfc fs/namespace.c:4037 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount fs/namespace.c:4215 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 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.1.117/7003: #0: ffff0000d51060e0 (&type->s_umount_key#26/1){+.+.}-{4:4}, at: alloc_super+0x168/0x7d4 fs/super.c:344 #1: ffff0000d5106610 (sb_internal){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] #1: ffff0000d5106610 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1916 [inline] #1: ffff0000d5106610 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2099 [inline] #1: ffff0000d5106610 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2b0/0x1084 fs/ext4/inode.c:215 #2: ffff0000dd0c69f8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff0000dd0c69f8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6404 [inline] #2: ffff0000dd0c69f8 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x358/0x6fc fs/ext4/inode.c:6485 stack backtrace: CPU: 0 UID: 0 PID: 7003 Comm: syz.1.117 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043 check_noncircular+0x154/0x174 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+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 percpu_down_read_internal+0x5c/0x298 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1796 [inline] ext4_writepages+0x150/0x2a0 fs/ext4/inode.c:3024 do_writepages+0x270/0x468 mm/page-writeback.c:2604 __writeback_single_inode+0x15c/0x13e8 fs/fs-writeback.c:1719 writeback_single_inode+0x18c/0x54c fs/fs-writeback.c:1840 write_inode_now+0x13c/0x1a4 fs/fs-writeback.c:2903 iput_final fs/inode.c:1901 [inline] iput+0x7d4/0xad4 fs/inode.c:1966 ext4_xattr_block_set+0x13dc/0x24bc fs/ext4/xattr.c:2199 ext4_xattr_move_to_block fs/ext4/xattr.c:2664 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2739 [inline] ext4_expand_extra_isize_ea+0xeb8/0x1830 fs/ext4/xattr.c:2827 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6364 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6407 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6485 ext4_evict_inode+0x930/0x1084 fs/ext4/inode.c:254 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:356 ext4_orphan_cleanup+0x930/0x107c fs/ext4/orphan.c:470 __ext4_fill_super fs/ext4/super.c:5617 [inline] ext4_fill_super+0x4854/0x4fcc fs/ext4/super.c:5736 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691 get_tree_bdev+0x2c/0x3c fs/super.c:1714 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5768 vfs_get_tree+0x90/0x28c fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3727 path_mount+0x5b4/0xdfc fs/namespace.c:4037 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount fs/namespace.c:4215 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 ------------[ cut here ]------------ EA inode 11 i_nlink=2 WARNING: CPU: 0 PID: 7003 at fs/ext4/xattr.c:1058 ext4_xattr_inode_update_ref+0x408/0x44c fs/ext4/xattr.c:1056 Modules linked in: CPU: 0 UID: 0 PID: 7003 Comm: syz.1.117 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : ext4_xattr_inode_update_ref+0x408/0x44c fs/ext4/xattr.c:1056 lr : ext4_xattr_inode_update_ref+0x408/0x44c fs/ext4/xattr.c:1056 sp : ffff8000a2e16ce0 x29: ffff8000a2e16d90 x28: 0000000000000000 x27: 1fffe0001ba18a21 x26: dfff800000000000 x25: ffff8000a2e16d00 x24: ffff7000145c2da0 x23: ffff800092c19000 x22: ffff0000dd0c4f58 x21: 0000000000000002 x20: 0000000000000001 x19: ffff0000dd0c4f18 x18: 1fffe000337d6e90 x17: ffff80008f59e000 x16: ffff800082dee240 x15: 0000000000000001 x14: 1ffff000145c2d10 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 00000000000549b7 x9 : 9a0e3927a37d5300 x8 : 9a0e3927a37d5300 x7 : 0000000000000000 x6 : ffff800080565bcc x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d6fd0 x2 : 0000000000000002 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: ext4_xattr_inode_update_ref+0x408/0x44c fs/ext4/xattr.c:1056 (P) ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1081 [inline] ext4_xattr_set_entry+0x928/0x15c0 fs/ext4/xattr.c:1719 ext4_xattr_ibody_set+0x204/0x5fc fs/ext4/xattr.c:2268 ext4_xattr_move_to_block fs/ext4/xattr.c:2671 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2739 [inline] ext4_expand_extra_isize_ea+0xf00/0x1830 fs/ext4/xattr.c:2827 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6364 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6407 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6485 ext4_evict_inode+0x930/0x1084 fs/ext4/inode.c:254 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:356 ext4_orphan_cleanup+0x930/0x107c fs/ext4/orphan.c:470 __ext4_fill_super fs/ext4/super.c:5617 [inline] ext4_fill_super+0x4854/0x4fcc fs/ext4/super.c:5736 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691 get_tree_bdev+0x2c/0x3c fs/super.c:1714 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5768 vfs_get_tree+0x90/0x28c fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3727 path_mount+0x5b4/0xdfc fs/namespace.c:4037 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount fs/namespace.c:4215 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 2221 hardirqs last enabled at (2221): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (2221): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (2220): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2220): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (1776): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (1776): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:650 softirqs last disabled at (1647): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 ---[ end trace 0000000000000000 ]--- EXT4-fs (loop1): 1 orphan inode deleted EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.