syzbot

xpad 8-1:179.65: xpad_irq_in - usb_submit_urb failed with result -19
xpad 8-1:179.65: xpad_irq_out - usb_submit_urb failed with result -19
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=5534/1/0x4000000000000000 softirq=126986/126989 fqs=2
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20974/3:b..l
rcu: 	(detected by 1, t=10505 jiffies, g=137029, q=566 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16014 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
RIP: 0010:lock_release+0x25e/0x3c0 kernel/locking/lockdep.c:5891
Code: 89 c5 7f d0 4c 89 ff 4c 89 f6 48 8b 54 24 18 e8 28 2f 00 00 48 8b 5c 24 08 48 c7 c7 06 f7 21 8e e8 27 59 07 0a b8 ff ff ff ff <65> 0f c1 05 3a cd 97 11 83 f8 01 75 2e 9c 58 a9 00 02 00 00 75 42
RSP: 0018:ffffc90000007d58 EFLAGS: 00000006
RAX: 00000000ffffffff RBX: 0000000000000087 RCX: 0000000000010003
RDX: 0000000000000001 RSI: ffffffff8e21f706 RDI: ffffffff8c28b660
RBP: ffff888031998bb8 R08: ffff8880793c2327 R09: ffff8880793c2318
R10: dffffc0000000000 R11: ffffed100f278465 R12: 0000000000000001
R13: 0000000000000001 R14: ffff8880b8628298 R15: ffff888031998000
FS:  000055555d5a3500(0000) GS:ffff888125289000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b737874950 CR3: 0000000034f35000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:198
 __run_hrtimer kernel/time/hrtimer.c:1926 [inline]
 __hrtimer_run_queues+0x2c3/0xa20 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 9a 15 f6 f5 48 89 df e8 a2 8a f6 f5 e8 6d 1f 22 f6 fb bf 01 00 00 00 <e8> 72 09 e8 f5 65 8b 05 9b 9f 8d 07 85 c0 74 07 5b e9 6c 70 64 f5
RSP: 0018:ffffc900068d75e0 EFLAGS: 00000206
RAX: 000000000027e41d RBX: ffff88805115c5b8 RCX: 0000000080000002
RDX: 0000000000000006 RSI: ffffffff8dfac14f RDI: 0000000000000001
RBP: 1ffff1100a22b8b6 R08: ffffffff9030ccf7 R09: 1ffffffff206199e
R10: dffffc0000000000 R11: fffffbfff206199f R12: ffff88805115c5b8
R13: dffffc0000000000 R14: 00fff6000002002d R15: ffff88805115c5b0
 spin_unlock_irq include/linux/spinlock.h:402 [inline]
 filemap_remove_folio+0x102/0x3a0 mm/filemap.c:259
 truncate_inode_folio+0x5d/0x70 mm/truncate.c:176
 shmem_undo_range+0x42f/0x1660 mm/shmem.c:1145
 shmem_truncate_range mm/shmem.c:1277 [inline]
 shmem_evict_inode+0x289/0xae0 mm/shmem.c:1407
 evict+0x61e/0xb10 fs/inode.c:841
 __dentry_kill+0x1a2/0x690 fs/dcache.c:718
 finish_dput+0xc9/0x480 fs/dcache.c:927
 __fput+0x691/0xa60 fs/file_table.c:518
 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:67 [inline]
 exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98
 __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:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f206b95d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fff3764c748 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000055555d5a3500 RCX: 00007f206b95d68e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fff3764c7ec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000000e9
R13: 00000000000927c0 R14: 00000000000b9169 R15: 00007fff3764c840
 </TASK>
task:syz.0.4248      state:R  running task     stack:25568 pid:20974 tgid:20969 ppid:5629   task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 kernel/sched/core.c:7189
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x760 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:839 [inline]
RIP: 0010:__pte_offset_map+0x50/0x240 mm/pgtable-generic.c:290
Code: 00 00 00 48 c7 c7 a0 cc 95 8e 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 50 e8 9b 9e 84 ff 48 83 c4 08 e8 f2 13 8c 09 89 c5 <31> ff 89 c6 e8 27 b2 a8 ff 85 ed 74 10 e8 1e c7 8d ff 84 c0 74 0e
RSP: 0018:ffffc90003467508 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000200000130000 RCX: ffff888032d60000
RDX: 00000000ee16f328 RSI: ffffffff8e21f706 RDI: ffffffff8c28b660
RBP: 0000000000000001 R08: ffffffff821d1679 R09: ffffffff8e95cca0
R10: dffffc0000000000 R11: fffff94000253661 R12: 1ffffd4000253660
R13: 0000000040b06007 R14: ffff8880644ae000 R15: ffffc90003467578
 pte_offset_map_lock+0x46/0x210 mm/pgtable-generic.c:400
 filemap_map_pages+0x8d3/0x2100 mm/filemap.c:3914
 do_fault_around mm/memory.c:5867 [inline]
 do_read_fault mm/memory.c:5900 [inline]
 do_fault mm/memory.c:6043 [inline]
 do_pte_missing+0x1f38/0x33f0 mm/memory.c:4566
 handle_pte_fault mm/memory.c:6427 [inline]
 __handle_mm_fault mm/memory.c:6565 [inline]
 handle_mm_fault+0x1bd9/0x3170 mm/memory.c:6734
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x1683/0x2720 mm/gup.c:1428
 populate_vma_page_range+0x2be/0x3c0 mm/gup.c:1860
 __mm_populate+0x25f/0x390 mm/gup.c:1963
 mm_populate include/linux/mm.h:4137 [inline]
 vm_mmap_pgoff+0x3aa/0x4f0 mm/util.c:586
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f22b019ce59
RSP: 002b:00007f22b0f9e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f22b0416090 RCX: 00007f22b019ce59
RDX: 0000000001000005 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f22b0232d6f R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f22b0416128 R14: 00007f22b0416090 R15: 00007fff5dc35038
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g137029 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27544 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7283
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x389/0x470 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>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 12438 Comm: kworker/u8:13 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xfcf/0x13d0 kernel/smp.c:892
Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 7a 06 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 25 02 0c 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 0a 02 0c
RSP: 0018:ffffc900071f6220 EFLAGS: 00000293
RAX: ffffffff81b9c286 RBX: ffff8880b873c148 RCX: ffff888050e15c40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900071f6350 R08: ffff888034f9b047 R09: 1ffff110069f3608
R10: dffffc0000000000 R11: ffffffff8178e300 R12: 1ffff110170c8589
R13: dffffc0000000000 R14: ffff8880b8642c48 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125389000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4c765ad368 CR3: 00000000979e6000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x5c3/0x10b0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:345 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:104
 page_vma_mkclean_one+0x438/0x780 mm/rmap.c:1138
 page_mkclean_one+0x1d8/0x2b0 mm/rmap.c:1186
 __rmap_walk_file+0x467/0x620 mm/rmap.c:3062
 rmap_walk mm/rmap.c:3106 [inline]
 folio_mkclean+0x2bb/0x3d0 mm/rmap.c:1218
 folio_clear_dirty_for_io+0x1a5/0x710 mm/page-writeback.c:2905
 mpage_submit_folio+0x86/0x2b0 fs/ext4/inode.c:2084
 mpage_process_page_bufs+0x6d5/0x8e0 fs/ext4/inode.c:2214
 mpage_prepare_extent_to_map+0xe1b/0x16f0 fs/ext4/inode.c:2753
 ext4_do_writepages+0xbac/0x4670 fs/ext4/inode.c:2894
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3042
 do_writepages+0x32e/0x550 mm/page-writeback.c:2571
 __writeback_single_inode+0x133/0x10e0 fs/fs-writeback.c:1764
 writeback_sb_inodes+0x979/0x19d0 fs/fs-writeback.c:2056
 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2132
 wb_writeback+0x459/0xb00 fs/fs-writeback.c:2243
 wb_check_old_data_flush fs/fs-writeback.c:2347 [inline]
 wb_do_writeback fs/fs-writeback.c:2400 [inline]
 wb_workfn+0xb12/0xf10 fs/fs-writeback.c:2428
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
 kthread+0x389/0x470 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>