INFO: task syz-executor:12533 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22344 pid:12533 tgid:12533 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
 rwsem_down_write_slowpath+0x87d/0x1080 kernel/locking/rwsem.c:1215
 __down_write_common kernel/locking/rwsem.c:1347 [inline]
 __down_write kernel/locking/rwsem.c:1356 [inline]
 down_write+0x1bc/0x200 kernel/locking/rwsem.c:1632
 __super_lock fs/super.c:60 [inline]
 __super_lock_excl fs/super.c:75 [inline]
 deactivate_super+0xac/0xe0 fs/super.c:617
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f369bf9f397
RSP: 002b:00007ffd6de31f38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f369c0344bb RCX: 00007f369bf9f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd6de31ff0
RBP: 00007ffd6de31ff0 R08: 00007ffd6de32ff0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd6de33080
R13: 00007f369c0344bb R14: 00000000000bb1be R15: 00007ffd6de330c0
 </TASK>
INFO: task syz.1.3008:15752 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.3008      state:D stack:25192 pid:15752 tgid:15746 ppid:14772  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 jfs_flush_journal+0x719/0xf50 fs/jfs/jfs_logmgr.c:1561
 jfs_sync_fs+0x7d/0xa0 fs/jfs/super.c:650
 dquot_quota_sync+0xd1/0x490 fs/quota/dquot.c:782
 __iterate_supers+0x282/0x420 fs/super.c:981
 quota_sync_all fs/quota/quota.c:69 [inline]
 __do_sys_quotactl fs/quota/quota.c:938 [inline]
 __se_sys_quotactl+0x3a0/0x9f0 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe09379e159
RSP: 002b:00007fe0919f6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fe093a25fa0 RCX: 00007fe09379e159
RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007fe09383506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe093a26038 R14: 00007fe093a25fa0 R15: 00007ffc0407a008
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/32: 1, last CPU#0:
 #0: ffffffff8ed5c920 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ed5c920 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ed5c920 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:12/5925: 2, last CPU#0:
 #0: ffff88803b9bf940 ((wq_completion)wg-kex-wg0#33){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88803b9bf940 ((wq_completion)wg-kex-wg0#33){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88803b9bf940 ((wq_completion)wg-kex-wg0#33){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88803b9bf940 ((wq_completion)wg-kex-wg0#33){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc90004d4fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90004d4fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90004d4fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc90004d4fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
locks held by syz-executor/12533: 1, on CPU#0:
 #0: ffff88807ff400e8 (&type->s_umount_key#105){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff88807ff400e8 (&type->s_umount_key#105){++++}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff88807ff400e8 (&type->s_umount_key#105){++++}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:617
locks held by getty/14409: 2, on CPU#0:
 #0: ffff8880327860a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032842e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz.1.3008/15752: 1, on CPU#0:
 #0: ffff88807ff400e8 (&type->s_umount_key#105){++++}-{4:4}, at: __super_lock fs/super.c:62 [inline]
 #0: ffff88807ff400e8 (&type->s_umount_key#105){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:124
locks held by syz.8.3274/16938: 1, on CPU#0:
 #0: ffff88807ff400e8 (&type->s_umount_key#105){++++}-{4:4}, at: __super_lock fs/super.c:62 [inline]
 #0: ffff88807ff400e8 (&type->s_umount_key#105){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:124
locks held by syz.2.3411/17476: 1, last CPU#0:
 #0: ffff888025f3e460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump fs/coredump.c:1126 [inline]
 #0: ffff888025f3e460 (sb_writers#5){.+.+}-{0:0}, at: vfs_coredump+0x3764/0x4520 fs/coredump.c:1195
locks held by syz.6.3463/17706: 1, on CPU#0:
 #0: ffff8880365d83b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff8880365d83b8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0 mm/util.c:579
locks held by syz.6.3463/17708: 2, last CPU#0:
 #0: ffff8880365d83b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 #0: ffff8880365d83b8 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x182/0x390 mm/gup.c:1942
 #1: ffffffff8ee901a0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:316 [inline]
 #1: ffffffff8ee901a0 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages+0x149/0x600 mm/page_alloc.c:5113
locks held by syz.3.3464/17713: 3, last CPU#0:
 #0: ffff88804630e460 (sb_writers#44){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88804630e460 (sb_writers#44){.+.+}-{0:0}, at: vfs_writev+0x2af/0x990 fs/read_write.c:1056
 #1: ffff888052ab2300 (&sb->s_type->i_mutex_key#64){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #1: ffff888052ab2300 (&sb->s_type->i_mutex_key#64){+.+.}-{4:4}, at: fuse_cache_write_iter fs/fuse/file.c:1510 [inline]
 #1: ffff888052ab2300 (&sb->s_type->i_mutex_key#64){+.+.}-{4:4}, at: fuse_file_write_iter+0xb7f/0x11b0 fs/fuse/file.c:1868
 #2: ffffffff8ebf9100 (wq_pool_mutex){+.+.}-{4:4}, at: __alloc_workqueue+0xa4f/0x1fe0 kernel/workqueue.c:5982
locks held by syz.0.3466/17714: 1, last CPU#0:
 #0: ffff88803473b6b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:544 [inline]
 #0: ffff88803473b6b8 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x2d8/0x9f0 mm/mmap.c:1323
locks held by sed/17717: 1, last CPU#0:
 #0: ffff888068e303b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff888068e303b8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0 mm/util.c:579
locks held by syz.2.3467/17720: 1, last CPU#0:
 #0: ffff888068e369b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff888068e369b8 (&mm->mmap_lock){++++}-{4:4}, at: do_mprotect_pkey+0x25c/0xd10 mm/mprotect.c:902

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>