rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=d4d4/1/0x4000000000000000 softirq=51144/51145 fqs=37
(detected by 1, t=10505 jiffies, g=69625, q=1562 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12417 Comm: cmp Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__lock_acquire+0x19a1/0x7d10 kernel/locking/lockdep.c:-1
Code: 48 c7 c0 a4 30 20 8e 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 b3 52 00 00 83 3d 8e c3 bb 0c 00 48 8b 5c 24 40 0f 84 a9 40 00 00 <48> 8b 84 24 d8 00 00 00 42 80 3c 00 00 74 12 4c 89 ff e8 38 26 6f
RSP: 0018:ffffc90000007900 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff888028e4c658 RCX: ffffffff81646700
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90afa248
RBP: ffffc90000007b50 R08: dffffc0000000000 R09: 1ffffffff215f449
R10: dffffc0000000000 R11: fffffbfff215f44a R12: ffffffff90a30f60
R13: 0000000000000064 R14: c05882cde8126320 R15: ffff888028e4c650
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab39ca9eb8 CR3: 000000005cf86000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:170
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x631/0xd50 kernel/time/hrtimer.c:1811
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:debug_lockdep_rcu_enabled+0x9/0x30 kernel/rcu/update.c:280
Code: 40 18 8c 8a 48 c7 c6 20 3c 8c 8a e8 91 e9 1f f7 0f 0b eb d1 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 31 c0 83 3d 57 f1 f1 03 00 <74> 1d 83 3d e2 24 f2 03 00 74 14 65 48 8b 0d 74 63 d4 75 31 c0 83
RSP: 0018:ffffc90004ebf1b8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88805bdbc000 RCX: dffffc0000000000
RDX: ffff888028e4bb80 RSI: 0000000000000003 RDI: 0000000000000002
RBP: ffffc90004ebf370 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e0ddc4 R12: ffff88807202e900
R13: 1ffff1100b7b7800 R14: 0000000000000003 R15: ffff88805ec3900c
mt_slot lib/maple_tree.c:816 [inline]
mas_slot lib/maple_tree.c:849 [inline]
mas_first_entry lib/maple_tree.c:6713 [inline]
mt_validate+0x53d/0x4cb0 lib/maple_tree.c:7229
validate_mm_mt+0xe2/0x440 mm/mmap.c:295
validate_mm+0xe1/0x2e0 mm/mmap.c:332
__vma_adjust+0x1855/0x1cd0 mm/mmap.c:879
vma_adjust include/linux/mm.h:2810 [inline]
__split_vma+0x3a7/0x500 mm/mmap.c:-1
do_mas_align_munmap+0x397/0x12b0 mm/mmap.c:2480
do_mas_munmap+0x240/0x2b0 mm/mmap.c:2650
__mmap_region mm/mmap.c:2698 [inline]
mmap_region+0x6e0/0x1ca0 mm/mmap.c:2916
do_mmap+0x964/0xfd0 mm/mmap.c:1436
vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:520
ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1482
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fab39f8c242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007fffeae7c098 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fab39c99000 RCX: 00007fab39f8c242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007fab39c99000
RBP: 0000000000000812 R08: 0000000000000003 R09: 000000000002c000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007fffeae7c158
R13: 00007fab39f69ab0 R14: 00007fffeae7c510 R15: 00000ffffd5cf816
rcu: rcu_preempt kthread starved for 10295 jiffies! g69625 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:26864 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 12089 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0xea2/0x1290 kernel/smp.c:998
Code: 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 f6 f6 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 82 f3 0a 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 67 f3 0a
RSP: 0018:ffffc900036e7b00 EFLAGS: 00000293
RAX: ffffffff81779349 RBX: dffffc0000000000 RCX: ffff88802ddd1dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900036e7c60 R08: ffffffff90afa29f R09: 1ffffffff215f453
R10: dffffc0000000000 R11: fffffbfff215f454 R12: 1ffff110171c8601
R13: ffff8880b8f3bbc0 R14: 0000000000000000 R15: ffff8880b8e43008
FS: 00007f09fd413880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f71469456b8 CR3: 000000004731e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1165
kill_bdev block/bdev.c:75 [inline]
blkdev_flush_mapping+0x122/0x290 block/bdev.c:681
blkdev_put_whole block/bdev.c:712 [inline]
blkdev_put+0x47f/0x710 block/bdev.c:972
blkdev_close+0x51/0x80 block/fops.c:514
__fput+0x22c/0x920 fs/file_table.c:320
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: 0033:0x7f09fcca7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffef7376d70 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f09fd413880 RCX: 00007f09fcca7407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007f09fd4136e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 000055703b002410 R14: 0000000000000008 R15: 000055703affd1a0
vkms_vblank_simulate: vblank timer overrun