INFO: task syz-executor:15319 blocked for more than 144 seconds.
      Tainted: G             L       syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22184 pid:15319 tgid:15319 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 bit_wait+0x13/0x110 kernel/sched/wait_bit.c:248
 __wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
 wait_on_bit include/linux/wait_bit.h:78 [inline]
 gfs2_glock_wait+0xb3/0x2a0 fs/gfs2/glock.c:1239
 gfs2_glock_nq_init fs/gfs2/glock.h:253 [inline]
 __gfs2_lookup+0x136/0x2b0 fs/gfs2/inode.c:1006
 __lookup_slow+0x1fb/0x2f0 fs/namei.c:1919
 lookup_slow+0x59/0x80 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 lookup_last fs/namei.c:2789 [inline]
 path_lookupat+0x3f5/0x8c0 fs/namei.c:2813
 filename_lookup+0x265/0x5d0 fs/namei.c:2842
 user_path_at+0x40/0x160 fs/namei.c:3641
 ksys_umount fs/namespace.c:2123 [inline]
 __do_sys_umount fs/namespace.c:2131 [inline]
 __se_sys_umount fs/namespace.c:2129 [inline]
 __x64_sys_umount+0xf6/0x170 fs/namespace.c:2129
 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: 0033:0x7f9d919a0797
RSP: 002b:00007ffce49e8b48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f9d91a35f63 RCX: 00007f9d919a0797
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffce49e8c00
RBP: 00007ffce49e8c00 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce49e9cf0
R13: 00007f9d91a35f63 R14: 0000000000194898 R15: 00007ffce49ebeb0
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/33: 1, last CPU#1:
 #0: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5397: 2, on CPU#0:
 #0: ffff8880277260a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032362e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/15319: 2, on CPU#1:
 #0: ffff888034f0a780 (&type->i_mutex_dir_key#25){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
 #0: ffff888034f0a780 (&type->i_mutex_dir_key#25){++++}-{4:4}, at: lookup_slow+0x46/0x80 fs/namei.c:1935
 #1: ffff88807947a100 (DCACHE_PAR_LOOKUP#24){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffff88807947a100 (DCACHE_PAR_LOOKUP#24){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffff88807947a100 (DCACHE_PAR_LOOKUP#24){+.+.}-{0:0}, at: __d_alloc_parallel+0x39e/0x1700 fs/dcache.c:2883
locks held by syz-executor/15435: 1, last CPU#1:
 #0: ffff888033394ce0 (&xt[i].mutex){+.+.}-{4:4}, at: xt_find_table_lock+0x55/0x400 net/netfilter/x_tables.c:1336
locks held by syz-executor/16311: 8, last CPU#0:
 #0: ffffffff9023a610 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1541 [inline]
 #0: ffffffff9023a610 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x10a/0x470 kernel/fork.c:1594
 #1: ffff88807cb0b440 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:550 [inline]
 #1: ffff88807cb0b440 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x18a/0x1e10 mm/mmap.c:1716
 #2: ffff88803c7f5900 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:540 [inline]
 #2: ffff88803c7f5900 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x277/0x1e10 mm/mmap.c:1723
 #3: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #3: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240 mm/pgtable-generic.c:302
 #4: ffff888057a5f1f8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline]
 #4: ffff888057a5f1f8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210 mm/pgtable-generic.c:423
 #5: ffff88803c7f5d40 (key){....}-{2:2}, at: percpu_counter_add_batch+0x116/0x1d0 lib/percpu_counter.c:101
 #6: ffff88807ab5a918 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pte_range mm/memory.c:1317 [inline]
 #6: ffff88807ab5a918 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range+0x6fb/0x5c00 mm/memory.c:1453
 #7: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #7: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #7: ffffffff9015a4a0 (rcu_read_lock){....}-{1:3}, at: page_table_check_set+0x1a4/0x590 mm/page_table_check.c:112

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 33 Comm: khungtaskd Tainted: G             L       syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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:377 [inline]
 watchdog+0x1073/0x10f0 kernel/hung_task.c:598
 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>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16311 Comm: syz-executor Tainted: G             L       syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:debug_lockdep_rcu_enabled+0xf/0x40 kernel/rcu/update.c:320
Code: 48 0f b9 3a 90 eb bc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d fb 34 ba 05 00 74 1d <83> 3d ea 62 ba 05 00 74 14 65 48 8b 0d f8 43 dd 08 31 c0 83 b9 a4
RSP: 0018:ffffc9000315f220 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff824bfefa RCX: 8000000000000003
RDX: 00000000372fa26e RSI: ffffffff8e932d08 RDI: ffffffff8c8ea080
RBP: 0000000000000001 R08: ffffffff824bfefa R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100cc6cb6d R12: dffffc0000000000
R13: 00007f8637c00000 R14: 0000000000098932 R15: ffff88813ff71260
FS:  000055556fbd4500(0000) GS:ffff888123411000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d523ffc CR3: 00000000558ea000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_read_lock_sched include/linux/rcupdate.h:948 [inline]
 pfn_valid+0xdf/0x490 include/linux/mmzone.h:2297
 page_table_check_set+0x23/0x590 mm/page_table_check.c:105
 page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
 set_ptes include/linux/pgtable.h:447 [inline]
 __copy_present_ptes mm/memory.c:1163 [inline]
 copy_present_ptes mm/memory.c:1242 [inline]
 copy_pte_range mm/memory.c:1365 [inline]
 copy_pmd_range+0x4adc/0x5c00 mm/memory.c:1453
 copy_pud_range mm/memory.c:1490 [inline]
 copy_p4d_range mm/memory.c:1514 [inline]
 copy_page_range+0xcc2/0x12b0 mm/memory.c:1600
 dup_mmap+0xf70/0x1e10 mm/mmap.c:1819
 dup_mm kernel/fork.c:1542 [inline]
 copy_mm+0x115/0x470 kernel/fork.c:1594
 copy_process+0x1ecc/0x44b0 kernel/fork.c:2320
 kernel_clone+0x2d7/0x940 kernel/fork.c:2784
 __do_sys_clone kernel/fork.c:2926 [inline]
 __se_sys_clone kernel/fork.c:2910 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2910
 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: 0033:0x7f86383c7fd2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffcd0e3a350 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffcd0e3a350 RCX: 00007f86383c7fd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffcd0e3a4dc R08: 0000000000000000 R09: 0000000000000001
R10: 000055556fbd47d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000001ba470 R15: 00007ffcd0e3a530
 </TASK>