rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4983/1:b..l P6040/2:b..l P5633/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=41037, q=1391607 ncpus=2)
task:udevd           state:R  running task     stack:24584 pid:5633  tgid:5633  ppid:4983   task_flags:0x40014c flags:0x00080800
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0x970 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 7b 24 25 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 86 89 f2 0e 0f 82 a4 02 00 00 8b 35 0e bd f2 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 1d 24 25 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc90003a1f5f0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dee9983 RDI: ffffffff8c1c4480
RBP: ffffffff8e7e5620 R08: 00000000866429ea R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
 unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
 __call_rcu_common.constprop.0+0xa5/0x9b0 kernel/rcu/tree.c:3131
 slab_free_hook mm/slub.c:2653 [inline]
 slab_free mm/slub.c:6251 [inline]
 kmem_cache_free+0x44a/0x6c0 mm/slub.c:6378
 tear_down_vmas+0x2a5/0x600 mm/mmap.c:1262
 exit_mmap+0x469/0xa10 mm/mmap.c:1320
 __mmput+0x12a/0x410 kernel/fork.c:1178
 mmput+0x67/0x80 kernel/fork.c:1201
 exit_mm kernel/exit.c:582 [inline]
 do_exit+0x8b2/0x2af0 kernel/exit.c:964
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1119
 __do_sys_exit_group kernel/exit.c:1130 [inline]
 __se_sys_exit_group kernel/exit.c:1128 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1128
 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd31fcf16c5
RSP: 002b:00007ffea3a795a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00005631936bbd90 RCX: 00007fd31fcf16c5
RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000000
RBP: 000056319346c2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffea3a795f0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
task:kworker/u8:10   state:R  running task     stack:22264 pid:6040  tgid:6040  ppid:2      task_flags:0x24248060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0x970 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 7b 24 25 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 86 89 f2 0e 0f 82 a4 02 00 00 8b 35 0e bd f2 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 1d 24 25 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc900052f5dd8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8dee9983 RDI: ffffffff8c1c4480
RBP: ffffffff8e7e5620 R08: 00000000ab89e961 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
 unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4570 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4906
 kmem_alloc_batch+0x49/0x170 lib/debugobjects.c:371
 fill_pool lib/debugobjects.c:420 [inline]
 debug_objects_fill_pool lib/debugobjects.c:752 [inline]
 debug_objects_fill_pool+0x24d/0x5a0 lib/debugobjects.c:723
 __debug_object_init+0xb5/0x3d0 lib/debugobjects.c:764
 __init_work+0x51/0x60 kernel/workqueue.c:695
 scsi_init_command+0x11a/0x290 drivers/scsi/scsi_lib.c:1288
 scsi_prepare_cmd drivers/scsi/scsi_lib.c:1681 [inline]
 scsi_queue_rq+0xbff/0x3c20 drivers/scsi/scsi_lib.c:1878
 blk_mq_dispatch_rq_list+0x422/0x1e70 block/blk-mq.c:2148
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
 blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
 __blk_mq_sched_dispatch_requests+0xcea/0x1620 block/blk-mq-sched.c:307
 blk_mq_sched_dispatch_requests+0xd7/0x1c0 block/blk-mq-sched.c:329
 blk_mq_run_hw_queue+0x348/0x670 block/blk-mq.c:2386
 blk_mq_dispatch_list+0x51d/0x1360 block/blk-mq.c:2949
 blk_mq_flush_plug_list block/blk-mq.c:2997 [inline]
 blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2969
 blk_add_rq_to_plug+0x1ca/0x540 block/blk-mq.c:1417
 blk_mq_submit_bio+0x1d59/0x2f10 block/blk-mq.c:3231
 __submit_bio+0x1e1/0x6c0 block/blk-core.c:635
 __submit_bio_noacct_mq block/blk-core.c:722 [inline]
 submit_bio_noacct_nocheck+0x543/0xbf0 block/blk-core.c:753
 submit_bio_noacct+0xd18/0x2000 block/blk-core.c:884
 blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline]
 ext4_io_submit+0xf7/0x1a0 fs/ext4/page-io.c:404
 io_submit_add_bh fs/ext4/page-io.c:461 [inline]
 ext4_bio_write_folio+0x76a/0x1eb0 fs/ext4/page-io.c:609
 mpage_process_page_bufs+0x473/0x8d0 fs/ext4/inode.c:2214
 mpage_prepare_extent_to_map+0xb50/0x1920 fs/ext4/inode.c:2753
 ext4_do_writepages+0x9fe/0x3f20 fs/ext4/inode.c:2894
 ext4_writepages+0x347/0x790 fs/ext4/inode.c:3042
 do_writepages+0x278/0x600 mm/page-writeback.c:2571
 __writeback_single_inode+0x164/0x1350 fs/fs-writeback.c:1764
 writeback_sb_inodes+0x766/0x1c60 fs/fs-writeback.c:2056
 __writeback_inodes_wb+0xf8/0x2d0 fs/fs-writeback.c:2132
 wb_writeback+0x720/0xb90 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+0x8dd/0xc00 fs/fs-writeback.c:2428
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:udevd           state:R  running task     stack:23640 pid:4983  tgid:4983  ppid:1      task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0x970 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x1453/0x2090 arch/x86/kernel/unwind_orc.c:532
Code: 4c 89 ef c6 05 9d 10 58 12 01 e8 e8 e8 ff ff e9 0f ef ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48 c1 ea 03 80 3c 02 00 <0f> 85 a6 08 00 00 48 89 c8 4d 8b 7d 38 48 ba 00 00 00 00 00 fc ff
RSP: 0018:ffffc9000351fa50 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff916c1436
RDX: 1ffff920006a3f5f RSI: 0000000000000001 RDI: ffffffff90e8c610
RBP: ffffc9000351fb08 R08: ffffffff916c143a R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: ffffc9000351fb10
R13: ffffc9000351fac0 R14: 0000000000000003 R15: 0000000000000001
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x162/0x1e0 mm/page_owner.c:165
 __reset_page_owner+0x84/0x190 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1397 [inline]
 __free_frozen_pages+0x794/0x10a0 mm/page_alloc.c:2938
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4570 [inline]
 slab_alloc_node mm/slub.c:4899 [inline]
 kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4906
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x35/0x390 fs/namei.c:182
 getname_flags fs/namei.c:225 [inline]
 getname include/linux/fs.h:2526 [inline]
 class_filename_constructor include/linux/fs.h:2553 [inline]
 __do_sys_unlink fs/namei.c:5602 [inline]
 __se_sys_unlink fs/namei.c:5600 [inline]
 __x64_sys_unlink+0x36/0x70 fs/namei.c:5600
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd31fd15937
RSP: 002b:00007ffea3a79758 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fd31fd15937
RDX: 0000000000000000 RSI: 0000000015846c40 RDI: 000056317c84802e
RBP: 0000000000000000 R08: 0000000015888946 R09: 0000000000000001
R10: 0000000000010eaa R11: 0000000000000202 R12: 0000000000000000
R13: 000056317c863100 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 986 jiffies! g41037 f0x2 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:26728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7283
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 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:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: f5 92 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 03 51 22 00 fb f4 <e9> fc 43 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df0 EFLAGS: 00000242
RAX: 0000000002d2718f RBX: ffff88801e2ba540 RCX: ffffffff8b894285
RDX: 0000000000000000 RSI: ffffffff8df0eee6 RDI: ffffffff8c1c4480
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10170a67b5
R10: ffff8880b8533dab R11: 0000000000000000 R12: 0000000000000001
R13: ffffed1003c574a8 R14: 0000000000000001 R15: ffffffff90d70550
FS:  0000000000000000(0000) GS:ffff888124486000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000dd030 CR3: 000000000e596000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
 default_idle+0x9/0x10 arch/x86/kernel/process.c:767
 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x464/0x590 kernel/sched/idle.c:352
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x148
 </TASK>