INFO: task syz-executor:10406 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22064 pid:10406 ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 io_schedule+0x7c/0xd0 kernel/sched/core.c:8798
 folio_wait_bit_common+0x70a/0xfa0 mm/filemap.c:1324
 __filemap_get_folio+0x423/0xdb0 mm/filemap.c:1959
 truncate_inode_pages_range+0x402/0x1090 mm/truncate.c:402
 evict+0x4dc/0x8d0 fs/inode.c:707
 dispose_list fs/inode.c:738 [inline]
 evict_inodes+0x60c/0x6a0 fs/inode.c:792
 generic_shutdown_super+0x93/0x340 fs/super.c:480
 kill_block_super+0x7c/0xe0 fs/super.c:1470
 deactivate_locked_super+0x93/0xf0 fs/super.c:332
 cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa743d9d9d7
RSP: 002b:00007fff5c2cbee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa743e32050 RCX: 00007fa743d9d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff5c2cbfa0
RBP: 00007fff5c2cbfa0 R08: 00007fff5c2ccfa0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff5c2cd030
R13: 00007fa743e32050 R14: 000000000005b70b R15: 00007fff5c2cd070
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u4:0/9:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8cb2dfb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8cb2e7d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
 #0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
3 locks held by kworker/u4:5/59:
2 locks held by pvrusb2-context/2310:
 #0: ffff88807c520188 (&hdw->big_lock_mutex){+.+.}-{3:3}, at: pvr2_hdw_initialize+0xe1/0x3c10 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2326
 #1: ffffffff8c9da110 (umhelper_sem){++++}-{3:3}, at: usermodehelper_read_trylock+0xf9/0x2b0 kernel/umh.c:218
2 locks held by getty/4028:
 #0: ffff88802f8fb098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x429/0x1390 drivers/tty/n_tty.c:2198
4 locks held by udevd/4261:
 #0: ffff8880511a9e80 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xad/0xd50 fs/seq_file.c:182
 #1: ffff8880586f6c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x58/0x410 fs/kernfs/file.c:172
 #2: ffff88801d3b7578 (kn->active#5){++++}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 #2: ffff88801d3b7578 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0xae/0x410 fs/kernfs/file.c:173
 #3: ffff888057372190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
 #3: ffff888057372190 (&dev->mutex){....}-{3:3}, at: uevent_show+0x16c/0x320 drivers/base/core.c:2669
1 lock held by udevd/4462:
1 lock held by syz-executor/10406:
 #0: ffff88805781e0e0 (&type->s_umount_key#118){+.+.}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
6 locks held by kworker/0:19/10818:
 #0: ffff88801a285938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
 #1: ffffc90003dc7d00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
 #2: ffff888145bd3190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
 #2: ffff888145bd3190 (&dev->mutex){....}-{3:3}, at: hub_event+0x19f/0x5560 drivers/usb/core/hub.c:5845
 #3: ffff888057372190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
 #3: ffff888057372190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x107/0x8a0 drivers/usb/core/hub.c:2305
 #4: ffff888028b18118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
 #4: ffff888028b18118 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1080 [inline]
 #4: ffff888028b18118 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xb2/0x850 drivers/base/dd.c:1283
 #5: ffff88807c520188 (&hdw->big_lock_mutex){+.+.}-{3:3}, at: pvr2_hdw_disconnect+0x69/0x500 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2710
2 locks held by sed/14704:

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xeee/0xf30 kernel/hung_task.c:377
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 14706 Comm: sed Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x7e/0x80 kernel/kcov.c:301
Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 01 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 <c3> 90 48 8b 04 24 65 48 8b 15 a4 f9 7f 7e 65 8b 0d a5 f9 7f 7e 81
RSP: 0000:ffffc9000d6d7a60 EFLAGS: 00000293
RAX: ffffffff81ad5a74 RBX: ffffea00003e0400 RCX: 0000000000000000
RDX: ffff88802cfa9dc0 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 1ffffd400007c081 R08: ffffea00003e0437 R09: 1ffffd400007c086
R10: dffffc0000000000 R11: fffff9400007c087 R12: ffffea00003e0408
R13: 0000000000000002 R14: 1ffffd400007c080 R15: ffffea00003e0401
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fadc1afe720 CR3: 000000002e59e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline]
 arch_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:1247 [inline]
 arch_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:1267 [inline]
 atomic_add_unless include/linux/atomic/atomic-instrumented.h:608 [inline]
 page_ref_add_unless include/linux/page_ref.h:238 [inline]
 folio_ref_add_unless include/linux/page_ref.h:247 [inline]
 folio_ref_try_add_rcu include/linux/page_ref.h:280 [inline]
 folio_try_get_rcu include/linux/page_ref.h:313 [inline]
 next_uptodate_page+0x1c4/0xb10 mm/filemap.c:3415
 next_map_page mm/filemap.c:3453 [inline]
 filemap_map_pages+0xe8b/0x11c0 mm/filemap.c:3530
 do_fault_around mm/memory.c:4598 [inline]
 do_read_fault mm/memory.c:4624 [inline]
 do_fault mm/memory.c:4758 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x2991/0x3ee0 mm/memory.c:5292
 do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fadc1bdc8f4
Code: 10 48 29 d7 eb 24 8b 4a 04 48 83 c0 13 48 83 e0 f8 48 8d 44 08 07 48 83 e0 f8 48 01 c2 48 8d 04 3a 4c 39 c0 0f 83 f4 00 00 00 <8b> 02 83 f8 04 75 d5 83 7a 08 05 75 cf 81 7a 0c 47 4e 55 00 75 c6
RSP: 002b:00007ffc05f6abd8 EFLAGS: 00010283
RAX: 00007fadc1932270 RBX: 00007fadc1932270 RCX: 000000000000000e
RDX: 00007fadc1afe720 RSI: 00007fadc1bd45f0 RDI: ffff80523e5018ec
RBP: 00007ffc05f6b050 R08: 0000000000000040 R09: 00000000effffef5
R10: 0000000070000029 R11: 00007ffc05f6abe0 R12: 0000000000000003
R13: 00007fadc1bd45f0 R14: 00007ffc05f6b0f0 R15: 00007fadc1b05000
 </TASK>
vkms_vblank_simulate: vblank timer overrun