I/O error, dev loop4, sector 1338 op 0x1:(WRITE) flags 0x800 phys_seg 2 prio class 2
loop4: writeback error on inode 33, offset 0, sector 1338
================================
WARNING: inconsistent lock state
syzkaller #0 Tainted: G             L     
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
ffff888078b244c0 (&sb->s_type->i_lock_key#39){+.?.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
ffff888078b244c0 (&sb->s_type->i_lock_key#39){+.?.}-{3:3}, at: igrab+0x2d/0x1e0 fs/inode.c:1583
{SOFTIRQ-ON-W} state was registered at:
  lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
  __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
  _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:341 [inline]
  inode_insert5+0x17b/0x5e0 fs/inode.c:1343
  iget5_locked+0x66/0xa0 fs/inode.c:1391
  ntfs_iget5+0xc1/0x38f0 fs/ntfs3/inode.c:534
  ntfs_fill_super+0x2341/0x4290 fs/ntfs3/super.c:1322
  get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
  vfs_get_tree+0x92/0x2a0 fs/super.c:1754
  fc_mount fs/namespace.c:1193 [inline]
  do_new_mount_fc fs/namespace.c:3760 [inline]
  do_new_mount+0x341/0xd30 fs/namespace.c:3836
  do_mount fs/namespace.c:4159 [inline]
  __do_sys_mount fs/namespace.c:4348 [inline]
  __se_sys_mount+0x31d/0x420 fs/namespace.c:4325
  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
  do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
  entry_SYSCALL_64_after_hwframe+0x77/0x7f
irq event stamp: 40690790
hardirqs last  enabled at (40690790): [<ffffffff8bafb080>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last  enabled at (40690790): [<ffffffff8bafb080>] _raw_spin_unlock_irqrestore+0x30/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (40690789): [<ffffffff8bafaeda>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (40690789): [<ffffffff8bafaeda>] _raw_spin_lock_irqsave+0x1a/0x60 kernel/locking/spinlock.c:162
softirqs last  enabled at (40689730): [<ffffffff8187fdef>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (40689730): [<ffffffff8187fdef>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (40689730): [<ffffffff8187fdef>] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
softirqs last disabled at (40690717): [<ffffffff8187f346>] do_softirq+0x76/0xd0 kernel/softirq.c:523

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&sb->s_type->i_lock_key#39);
  <Interrupt>
    lock(&sb->s_type->i_lock_key#39);

 *** DEADLOCK ***

no locks held by swapper/0/0.

stack backtrace:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_usage_bug+0x28b/0x2e0 kernel/locking/lockdep.c:4042
 valid_state kernel/locking/lockdep.c:4056 [inline]
 mark_lock_irq+0x410/0x420 kernel/locking/lockdep.c:-1
 mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753
 mark_usage kernel/locking/lockdep.c:-1 [inline]
 __lock_acquire+0x689/0x2cf0 kernel/locking/lockdep.c:5191
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:341 [inline]
 igrab+0x2d/0x1e0 fs/inode.c:1583
 fserror_report+0x3c5/0x740 fs/fserror.c:159
 fserror_report_io include/linux/fserror.h:48 [inline]
 iomap_finish_ioend_buffered+0x2c7/0x6c0 fs/iomap/ioend.c:60
 blk_update_request+0x57e/0xe60 block/blk-mq.c:1016
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1178
 blk_complete_reqs block/blk-mq.c:1253 [inline]
 blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258
 handle_softirqs+0x22a/0x870 kernel/softirq.c:622
 do_softirq+0x76/0xd0 kernel/softirq.c:523
 </IRQ>
 <TASK>
 do_softirq_post_smp_call_flush include/linux/interrupt.h:603 [inline]
 flush_smp_call_function_queue+0x106/0x190 kernel/smp.c:623
 do_idle+0x494/0x500 kernel/sched/idle.c:359
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
 rest_init+0x2de/0x300 init/main.c:760
 start_kernel+0x385/0x3d0 init/main.c:1210
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x147
 </TASK>