INFO: task syz-executor:7345 blocked for more than 143 seconds.
      Not tainted 6.15.0-syzkaller-13526-g7a912d04415b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21128 pid:7345  tgid:7345  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 bit_wait+0x11/0xd0 kernel/sched/wait_bit.c:237
 __wait_on_bit+0xb9/0x310 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x123/0x170 kernel/sched/wait_bit.c:64
 wait_on_bit include/linux/wait_bit.h:77 [inline]
 gfs2_glock_wait+0xbd/0x2a0 fs/gfs2/glock.c:1351
 gfs2_glock_nq_init fs/gfs2/glock.h:238 [inline]
 __gfs2_lookup+0x117/0x270 fs/gfs2/inode.c:987
 __lookup_slow+0x297/0x3d0 fs/namei.c:1817
 lookup_slow+0x53/0x70 fs/namei.c:1834
 walk_component+0x2d2/0x400 fs/namei.c:2138
 lookup_last fs/namei.c:2639 [inline]
 path_lookupat+0x163/0x430 fs/namei.c:2663
 filename_lookup+0x212/0x570 fs/namei.c:2692
 user_path_at+0x3a/0x60 fs/namei.c:3127
 ksys_umount fs/namespace.c:2147 [inline]
 __do_sys_umount fs/namespace.c:2155 [inline]
 __se_sys_umount fs/namespace.c:2153 [inline]
 __x64_sys_umount+0xee/0x160 fs/namespace.c:2153
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed3618fc57
RSP: 002b:00007fffdd6d54b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fed36210925 RCX: 00007fed3618fc57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffdd6d5570
RBP: 00007fffdd6d5570 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffdd6d6660
R13: 00007fed36210925 R14: 00000000000940a9 R15: 00007fffdd6d8820
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
6 locks held by kworker/u8:4/77:
1 lock held by udevd/5201:
 #0: ffff8880b873b918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606
2 locks held by getty/5592:
 #0: ffff8880311900a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900036c32f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by kworker/u8:14/6069:
 #0: ffff88801a481148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88801a481148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321
 #1: ffffc90004ef7bc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc90004ef7bc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321
1 lock held by syz-executor/7345:
 #0: ffff888078b56c48 (&type->i_mutex_dir_key#27){.+.+}-{4:4}, at: inode_lock_shared include/linux/fs.h:882 [inline]
 #0: ffff888078b56c48 (&type->i_mutex_dir_key#27){.+.+}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1833
3 locks held by kworker/1:1/10652:
 #0: ffff88801a478d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88801a478d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321
 #1: ffffc90002fd7bc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc90002fd7bc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321
 #2: ffff888057820240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x26b/0x3180 drivers/net/netdevsim/fib.c:1490

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-13526-g7a912d04415b #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:307 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:470
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13072 Comm: modprobe Not tainted 6.15.0-syzkaller-13526-g7a912d04415b #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pfn_valid+0x40a/0x490 include/linux/rcupdate.h:-1
Code: 5d e9 e5 38 e1 fe cc e8 a4 53 91 ff e8 3f 8e 04 ff 48 89 e0 31 ed eb 0d e8 93 53 91 ff e8 2e 8e 04 ff 48 89 e0 48 89 c4 eb cb <f3> 0f 1e fa 48 bf 00 00 00 00 04 00 00 00 4c 89 f6 e8 50 58 91 ff
RSP: 0000:ffffc9000bbb7900 EFLAGS: 00000293
RAX: ffffffff822f0452 RBX: 000000000000b6d8 RCX: ffff88802b263c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000b6d8
RBP: 000000000b6d8025 R08: ffffea00002db607 R09: 1ffffd400005b6c0
R10: dffffc0000000000 R11: fffff9400005b6c1 R12: ffff88805dfd2dd0
R13: dffffc0000000000 R14: 000000000000b6d8 R15: 0000000000000001
FS:  00007f391539bc80(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39153d6e9c CR3: 000000007914d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 page_table_check_set+0x25/0x730 mm/page_table_check.c:105
 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
 set_ptes include/linux/pgtable.h:292 [inline]
 set_pte_range+0x6a5/0x700 mm/memory.c:5350
 filemap_map_order0_folio mm/filemap.c:3692 [inline]
 filemap_map_pages+0xf29/0x1740 mm/filemap.c:3746
 do_fault_around mm/memory.c:5568 [inline]
 do_read_fault mm/memory.c:5601 [inline]
 do_fault mm/memory.c:5744 [inline]
 do_pte_missing mm/memory.c:4251 [inline]
 handle_pte_fault mm/memory.c:6089 [inline]
 __handle_mm_fault+0x368a/0x5620 mm/memory.c:6232
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6401
 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f39153d6e9c
Code: Unable to access opcode bytes at 0x7f39153d6e72.
RSP: 002b:00007ffdb60f6648 EFLAGS: 00010206
RAX: 00007f39153d6e9c RBX: 00007f3915745000 RCX: 0000000000000000
RDX: 00007f39153fdd00 RSI: 0000000000000000 RDI: 00007f39153fe010
RBP: 00007ffdb60f6710 R08: 00007ffdb60f6690 R09: 0000000000000000
R10: 00007ffdb60f6540 R11: 00007ffdb60f6600 R12: 0000000000000000
R13: 00007f3915745a08 R14: 0000000000000000 R15: 00007f39154096b0
 </TASK>