====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.7.2221/18883 is trying to acquire lock: ffff8880445e8c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ffff8880445e8c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1876 [inline] ffff8880445e8c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x205/0x3b0 fs/ext4/inode.c:3042 but task is already holding lock: ffff8880355f4260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff8880355f4260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6526 [inline] ffff8880355f4260 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3d0/0x700 fs/ext4/inode.c:6607 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->xattr_sem){++++}-{4:4}: down_write+0x96/0x200 kernel/locking/rwsem.c:1631 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_inline_data_truncate+0x1cf/0xb70 fs/ext4/inline.c:1864 ext4_truncate+0x444/0x1090 fs/ext4/inode.c:4620 ext4_evict_inode+0xa2e/0x10c0 fs/ext4/inode.c:274 evict+0x624/0xb50 fs/inode.c:825 d_delete_notify include/linux/fsnotify.h:381 [inline] vfs_rmdir+0x413/0x6a0 fs/namei.c:5394 filename_rmdir+0x292/0x520 fs/namei.c:5438 __do_sys_unlinkat fs/namei.c:5613 [inline] __se_sys_unlinkat+0x71/0x1a0 fs/namei.c:5606 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read_internal+0x48/0x1c0 include/linux/percpu-rwsem.h:53 percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs/super.h:19 [inline] sb_start_intwrite include/linux/fs/super.h:177 [inline] ext4_evict_inode+0x426/0x10c0 fs/ext4/inode.c:228 evict+0x624/0xb50 fs/inode.c:825 ext4_ext_migrate+0xddf/0x10e0 fs/ext4/migrate.c:594 __ext4_ioctl fs/ext4/ioctl.c:1702 [inline] ext4_ioctl+0x2346/0x4b70 fs/ext4/ioctl.c:1931 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 percpu_down_read_internal+0x48/0x1c0 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1876 [inline] ext4_writepages+0x205/0x3b0 fs/ext4/inode.c:3042 do_writepages+0x338/0x560 mm/page-writeback.c:2571 __writeback_single_inode+0x12e/0xf90 fs/fs-writeback.c:1787 writeback_single_inode+0x4ef/0xe70 fs/fs-writeback.c:1906 write_inode_now+0x1c2/0x290 fs/fs-writeback.c:3060 iput_final fs/inode.c:2009 [inline] iput+0x98b/0xf00 fs/inode.c:2068 ext4_xattr_block_set+0x22e4/0x2a80 fs/ext4/xattr.c:2153 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+0x1342/0x1e70 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6486 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6529 [inline] __ext4_mark_inode_dirty+0x455/0x700 fs/ext4/inode.c:6607 ext4_evict_inode+0x976/0x10c0 fs/ext4/inode.c:267 evict+0x624/0xb50 fs/inode.c:825 ext4_orphan_cleanup+0xc7a/0x14c0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5705 [inline] ext4_fill_super+0x5cb4/0x65c0 fs/ext4/super.c:5828 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1640 vfs_get_tree+0x92/0x2a0 fs/super.c:1700 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3841 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 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 --> sb_internal --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(sb_internal); lock(&ei->xattr_sem); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.7.2221/18883: #0: ffff88802618a0d8 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline] #0: ffff88802618a0d8 (&type->s_umount_key#28/1){+.+.}-{4:4}, at: sget_fc+0x938/0x1900 fs/super.c:766 #1: ffff88802618a640 (sb_internal){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] #1: ffff88802618a640 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline] #1: ffff88802618a640 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs/super.h:177 [inline] #1: ffff88802618a640 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x426/0x10c0 fs/ext4/inode.c:228 #2: ffff8880355f4260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff8880355f4260 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6526 [inline] #2: ffff8880355f4260 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3d0/0x700 fs/ext4/inode.c:6607 stack backtrace: CPU: 0 UID: 0 PID: 18883 Comm: syz.7.2221 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 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+0x1520/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 percpu_down_read_internal+0x48/0x1c0 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1876 [inline] ext4_writepages+0x205/0x3b0 fs/ext4/inode.c:3042 do_writepages+0x338/0x560 mm/page-writeback.c:2571 __writeback_single_inode+0x12e/0xf90 fs/fs-writeback.c:1787 writeback_single_inode+0x4ef/0xe70 fs/fs-writeback.c:1906 write_inode_now+0x1c2/0x290 fs/fs-writeback.c:3060 iput_final fs/inode.c:2009 [inline] iput+0x98b/0xf00 fs/inode.c:2068 ext4_xattr_block_set+0x22e4/0x2a80 fs/ext4/xattr.c:2153 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+0x1342/0x1e70 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6486 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6529 [inline] __ext4_mark_inode_dirty+0x455/0x700 fs/ext4/inode.c:6607 ext4_evict_inode+0x976/0x10c0 fs/ext4/inode.c:267 evict+0x624/0xb50 fs/inode.c:825 ext4_orphan_cleanup+0xc7a/0x14c0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5705 [inline] ext4_fill_super+0x5cb4/0x65c0 fs/ext4/super.c:5828 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1640 vfs_get_tree+0x92/0x2a0 fs/super.c:1700 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3841 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe1aa19f34a 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:00007fe1ab03fe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe1ab03fee0 RCX: 00007fe1aa19f34a RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007fe1ab03fea0 RBP: 0000200000000180 R08: 00007fe1ab03fee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007fe1ab03fea0 R14: 000000000000047a R15: 0000200000000b40 EXT4-fs error (device loop7): ext4_xattr_inode_iget:441: inode #11: comm syz.7.2221: iget: bad extra_isize 58 (inode size 256) loop7: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop7): ext4_xattr_inode_iget:446: comm syz.7.2221: error while reading EA inode 11 err=-117 loop7: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop7): ext4_xattr_inode_iget:441: inode #11: comm syz.7.2221: iget: bad extra_isize 58 (inode size 256) loop7: lost file I/O error report for ino 11 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop7): ext4_xattr_inode_iget:446: comm syz.7.2221: error while reading EA inode 11 err=-117 loop7: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop7): ext4_xattr_inode_iget:441: inode #18: comm syz.7.2221: iget: bad extra_isize 58 (inode size 256) loop7: lost file I/O error report for ino 18 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop7): ext4_xattr_inode_iget:446: comm syz.7.2221: error while reading EA inode 18 err=-117 loop7: lost filesystem error report for type 5 error -117 EXT4-fs error (device loop7): ext4_xattr_inode_iget:441: inode #18: comm syz.7.2221: iget: bad extra_isize 58 (inode size 256) loop7: lost file I/O error report for ino 18 type 5 pos 0x0 len 0x0 error -117 EXT4-fs error (device loop7): ext4_xattr_inode_iget:446: comm syz.7.2221: error while reading EA inode 18 err=-117 loop7: lost filesystem error report for type 5 error -117 EXT4-fs (loop7): 1 orphan inode deleted EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.