INFO: task syz-executor:23751 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc7-syzkaller-00007-g4a95bc121ccd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22232 pid:23751 tgid:23751 ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 io_schedule+0x81/0xe0 kernel/sched/core.c:7742
 folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
 __folio_lock mm/filemap.c:1664 [inline]
 folio_lock include/linux/pagemap.h:1137 [inline]
 __filemap_get_folio+0x139/0xaf0 mm/filemap.c:1917
 truncate_inode_pages_range+0x3ed/0xda0 mm/truncate.c:384
 evict+0x517/0x9c0 fs/inode.c:812
 dispose_list fs/inode.c:852 [inline]
 evict_inodes+0x636/0x6c0 fs/inode.c:906
 generic_shutdown_super+0x9a/0x2c0 fs/super.c:627
 kill_block_super+0x44/0x90 fs/super.c:1710
 deactivate_locked_super+0xbc/0x130 fs/super.c:473
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1431
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x9a/0x120 kernel/entry/common.c:218
 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f52b8fc97
RSP: 002b:00007fffb5735158 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7f52c1089d RCX: 00007f7f52b8fc97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb5735210
RBP: 00007fffb5735210 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffb57362a0
R13: 00007f7f52c1089d R14: 0000000000105964 R15: 00007fffb57362e0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5581:
 #0: ffff88814d5f90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by udevd/5981:
1 lock held by syz-executor/23751:
 #0: ffff888026cc60e0 (&type->s_umount_key#64){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff888026cc60e0 (&type->s_umount_key#64){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff888026cc60e0 (&type->s_umount_key#64){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505
2 locks held by kworker/u8:10/27732:
1 lock held by syz.4.12256/5654:
2 locks held by rm/5708:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc7-syzkaller-00007-g4a95bc121ccd #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:437
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5654 Comm: syz.4.12256 Not tainted 6.15.0-rc7-syzkaller-00007-g4a95bc121ccd #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:-1 [inline]
RIP: 0010:atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline]
RIP: 0010:desc_read+0x2c8/0x3f0 kernel/printk/printk_ringbuffer.c:534
Code: 38 84 c0 0f 85 24 01 00 00 44 89 33 eb 0f e8 3f ac 1d 00 48 85 db 75 bc e8 35 ac 1d 00 48 89 ef be 08 00 00 00 e8 b8 a9 7f 00 <48> 8b 44 24 28 42 80 3c 38 00 74 08 48 89 ef e8 34 a7 7f 00 4c 8b
RSP: 0018:ffffc9000d08f058 EFLAGS: 00000256
RAX: ffffffff81a24501 RBX: 0000000000000000 RCX: ffffffff81a245a8
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8de342c8
RBP: ffffffff8de342c8 R08: ffffffff8de342cf R09: 1ffffffff1bc6859
R10: dffffc0000000000 R11: fffffbfff1bc685a R12: ffffc9000d08f1a0
R13: ffffffff8deb6408 R14: 0000000000005183 R15: dffffc0000000000
FS:  00007f76289636c0(0000) GS:ffff8881260c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f77e7749000 CR3: 0000000061ce1000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1874 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1942 [inline]
 _prb_read_valid+0x608/0xa90 kernel/printk/printk_ringbuffer.c:2113
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2185
 printk_get_next_message+0x15c/0x7b0 kernel/printk/printk.c:3005
 console_emit_next_record kernel/printk/printk.c:3092 [inline]
 console_flush_all+0x4ca/0xc40 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
 _printk+0xcf/0x120 kernel/printk/printk.c:2475
 __xfs_printk fs/xfs/xfs_message.c:24 [inline]
 xfs_printk_level+0x18b/0x280 fs/xfs/xfs_message.c:44
 xfs_qm_quotacheck+0x16b/0x6f0 fs/xfs/xfs_qm.c:1566
 xfs_qm_mount_quotas+0x26a/0x670 fs/xfs/xfs_qm.c:1740
 xfs_mountfs+0x1b6f/0x22f0 fs/xfs/xfs_mount.c:1053
 xfs_fs_fill_super+0x1286/0x16d0 fs/xfs/xfs_super.c:1915
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1636
 vfs_get_tree+0x92/0x2b0 fs/super.c:1759
 do_new_mount+0x24a/0xa40 fs/namespace.c:3881
 do_mount fs/namespace.c:4221 [inline]
 __do_sys_mount fs/namespace.c:4432 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7627b9010a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7628962e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7628962ef0 RCX: 00007f7627b9010a
RDX: 0000200000009600 RSI: 0000200000009640 RDI: 00007f7628962eb0
RBP: 0000200000009600 R08: 00007f7628962ef0 R09: 0000000000800840
R10: 0000000000800840 R11: 0000000000000246 R12: 0000200000009640
R13: 00007f7628962eb0 R14: 000000000000968d R15: 0000200000000000
 </TASK>