INFO: task syz.5.19:515 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.19        state:D stack:0     pid:515   tgid:515   ppid:478    flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x359/0x630 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 __flush_work+0x6d2/0xac0 kernel/workqueue.c:4233
 __cancel_work_sync kernel/workqueue.c:4354 [inline]
 cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4391
 uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
 uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
 __fput+0x1fe/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e3/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fee2f98e929
RSP: 002b:00007ffcfdeb3a48 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000cdac RCX: 00007fee2f98e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fee2fbb7ba0 R08: 0000000000000001 R09: 00000002fdeb3d3f
R10: 00007fee2f800000 R11: 0000000000000246 R12: 00007fee2fbb5fac
R13: 00007fee2fbb5fa0 R14: ffffffffffffffff R15: 00007ffcfdeb3b60
 </TASK>
INFO: task syz.1.21:521 blocked for more than 130 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.21        state:D stack:0     pid:521   tgid:521   ppid:477    flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x359/0x630 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 __flush_work+0x6d2/0xac0 kernel/workqueue.c:4233
 __cancel_work_sync kernel/workqueue.c:4354 [inline]
 cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4391
 uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
 uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
 __fput+0x1fe/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e3/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff9c6b8e929
RSP: 002b:00007fffb1bfada8 EFLAGS: 00000246
 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000ce03 RCX: 00007ff9c6b8e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ff9c6db7ba0 R08: 0000000000000001 R09: 00000002b1bfb09f
R10: 00007ff9c6a00000 R11: 0000000000000246 R12: 00007ff9c6db5fac
R13: 00007ff9c6db5fa0 R14: ffffffffffffffff R15: 00007fffb1bfaec0
 </TASK>
INFO: task syz.2.18:523 blocked for more than 131 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.18        state:D stack:0     pid:523   tgid:523   ppid:475    flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x359/0x630 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 __flush_work+0x6d2/0xac0 kernel/workqueue.c:4233
 __cancel_work_sync kernel/workqueue.c:4354 [inline]
 cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4391
 uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
 uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
 __fput+0x1fe/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e3/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8b5138e929
RSP: 002b:00007ffe39f9c3d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000ce1c RCX: 00007f8b5138e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f8b515b7ba0 R08: 0000000000000001 R09: 0000000239f9c6cf
R10: 00007f8b51200000 R11: 0000000000000246 R12: 00007f8b515b5fac
R13: 00007f8b515b5fa0 R14: ffffffffffffffff R15: 00007ffe39f9c4f0
 </TASK>
INFO: task syz.4.16:526 blocked for more than 132 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.16        state:D stack:0     pid:526   tgid:526   ppid:473    flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x359/0x630 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 __flush_work+0x6d2/0xac0 kernel/workqueue.c:4233
 __cancel_work_sync kernel/workqueue.c:4354 [inline]
 cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4391
 uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
 uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
 __fput+0x1fe/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e3/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f891178e929
RSP: 002b:00007ffdb5b91db8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000ce43 RCX: 00007f891178e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f89119b7ba0 R08: 0000000000000001 R09: 00000002b5b920af
R10: 00007f8911600000 R11: 0000000000000246 R12: 00007f89119b5fac
R13: 00007f89119b5fa0 R14: ffffffffffffffff R15: 00007ffdb5b91ed0
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 07647c26a3ca6e3ba95b04345a859ed4bb4ff8a3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:423
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 525 Comm: kworker/1:4 Not tainted syzkaller #0 07647c26a3ca6e3ba95b04345a859ed4bb4ff8a3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events uhid_device_add_worker
RIP: 0010:__raw_callee_save___pv_queued_spin_unlock+0x9/0x1d
Code: 41 58 5f 5e 5a 59 5d c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 52 <b8> 01 00 00 00 31 d2 f0 0f b0 17 75 07 5a 5d c3 cc cc cc cc 56 0f
RSP: 0018:ffffc90000230390 EFLAGS: 00000286
RAX: 1ffffffff0e5cd8c RBX: ffffea0004a32e00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8881f6f722c0
RBP: ffffc90000230398 R08: ffffea0004a32ff7 R09: 1ffffd40009465fe
R10: dffffc0000000000 R11: fffff940009465ff R12: ffff8881f6f722e0
R13: 0000000000000000 R14: ffff8881f6f722c0 R15: 0000000000000941
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fedc5568030 CR3: 000000010b758000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:589 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline]
 do_raw_spin_unlock include/linux/spinlock.h:204 [inline]
 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_unlock+0x45/0x60 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 rmqueue_pcplist mm/page_alloc.c:3293 [inline]
 rmqueue mm/page_alloc.c:3325 [inline]
 get_page_from_freelist+0x6d6/0x4960 mm/page_alloc.c:3911
 __alloc_pages_noprof+0x31f/0x7b0 mm/page_alloc.c:5258
 alloc_slab_page+0x6b/0x1f0 mm/slub.c:-1
 allocate_slab+0x69/0x440 mm/slub.c:2660
 new_slab mm/slub.c:2714 [inline]
 ___slab_alloc+0x59a/0x8b0 mm/slub.c:3902
 __slab_alloc mm/slub.c:3992 [inline]
 __slab_alloc_node mm/slub.c:4045 [inline]
 slab_alloc_node mm/slub.c:4206 [inline]
 __do_kmalloc_node mm/slub.c:4356 [inline]
 __kmalloc_node_track_caller_noprof+0x23a/0x440 mm/slub.c:4376
 kmalloc_reserve+0x144/0x500 net/core/skbuff.c:618
 __alloc_skb+0x144/0x370 net/core/skbuff.c:687
 alloc_skb include/linux/skbuff.h:1331 [inline]
 igmpv3_newpack+0x152/0xe60 net/ipv4/igmp.c:362
 add_grhead+0x75/0x340 net/ipv4/igmp.c:443
 add_grec+0x1150/0x1450 net/ipv4/igmp.c:577
 igmpv3_send_cr net/ipv4/igmp.c:714 [inline]
 igmp_ifc_timer_expire+0x880/0xeb0 net/ipv4/igmp.c:813
 call_timer_fn+0x49/0x300 kernel/time/timer.c:1797
 expire_timers kernel/time/timer.c:1848 [inline]
 __run_timers kernel/time/timer.c:2422 [inline]
 __run_timer_base+0x6b3/0x9a0 kernel/time/timer.c:2434
 run_timer_base kernel/time/timer.c:2443 [inline]
 run_timer_softirq+0x35/0x70 kernel/time/timer.c:2453
 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
 __do_softirq kernel/softirq.c:659 [inline]
 invoke_softirq kernel/softirq.c:476 [inline]
 __irq_exit_rcu+0x48/0xc0 kernel/softirq.c:708
 irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x82/0x90 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2076 [inline]
RIP: 0010:vprintk_emit+0x530/0x640 kernel/printk/printk.c:2462
Code: 81 e6 00 02 00 00 31 ff e8 0d 21 1e 00 48 81 e3 00 02 00 00 75 07 e8 1f 1c 1e 00 eb 06 e8 18 1c 1e 00 fb c6 05 00 93 31 07 00 <e9> 42 fd ff ff e8 06 1c 1e 00 e9 a5 fe ff ff 41 ff ce bf 58 89 41
RSP: 0018:ffffc90001f0f220 EFLAGS: 00000293
RAX: ffffffff8167c7f8 RBX: 0000000000000200 RCX: ffff88811e604c00
RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffc90001f0f2f0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520003e1e34 R12: 1ffff920003e1e48
R13: 000000000000003a R14: 0000000000000000 R15: dffffc0000000000
 dev_vprintk_emit+0x33b/0x400 drivers/base/core.c:4962
 dev_printk_emit+0xe1/0x130 drivers/base/core.c:4973
 __dev_printk+0x17f/0x1b0 drivers/base/core.c:4985
 _dev_warn+0x10b/0x160 drivers/base/core.c:5029
 hid_parser_main+0x84b/0xdc0 drivers/hid/hid-core.c:632
 hid_open_report+0x86b/0x1110 drivers/hid/hid-core.c:1278
 hid_parse include/linux/hid.h:1138 [inline]
 hid_generic_probe+0x42/0x90 drivers/hid/hid-generic.c:66
 __hid_device_probe drivers/hid/hid-core.c:2711 [inline]
 hid_device_probe+0x2c4/0x5d0 drivers/hid/hid-core.c:2748
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2d6/0x890 drivers/base/dd.c:657
 __driver_probe_device+0x198/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x25d/0x2f0 drivers/base/bus.c:459
 __device_attach+0x2bd/0x3a0 drivers/base/dd.c:1029
 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
 bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
 device_add+0x80c/0xc00 drivers/base/core.c:3692
 hid_add_device+0x39b/0x560 drivers/hid/hid-core.c:2894
 uhid_device_add_worker+0x49/0xf0 drivers/hid/uhid.c:73
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d5/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>