rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=210c/1/0x4000000000000000 softirq=14878/14879 fqs=12
	(detected by 0, t=10506 jiffies, g=16089, q=1211 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5304 Comm: syz.3.282 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
RIP: 0010:_raw_spin_lock_irqsave+0x67/0xf0 kernel/locking/spinlock.c:162
Code: 8a 49 89 e7 49 c1 ef 03 48 b8 f1 f1 f1 f1 00 f3 f3 f3 49 bc 00 00 00 00 00 fc ff df 4b 89 04 27 48 c7 44 24 20 00 00 00 00 9c <8f> 44 24 20 4c 8b 74 24 20 fa 41 f7 c6 00 02 00 00 74 05 e8 d1 c3
RSP: 0018:ffffc900001e0bf8 EFLAGS: 00000802
RAX: f3f3f300f1f1f1f1 RBX: ffffffff96c8ce18 RCX: 0000000000013f50
RDX: 0000000000010000 RSI: ffffffff8a6df580 RDI: ffffffff96c8ce18
RBP: ffffc900001e0c80 R08: 0000000000000004 R09: 0000000000000003
R10: fffff5200003c180 R11: 1ffff9200003c180 R12: dffffc0000000000
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff9200003c180
FS:  00007f52a0b5c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c332619 CR3: 000000005a630000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 debug_object_activate+0x6a/0x490 lib/debugobjects.c:698
 debug_hrtimer_activate kernel/time/hrtimer.c:448 [inline]
 debug_activate kernel/time/hrtimer.c:503 [inline]
 enqueue_hrtimer+0x30/0x3f0 kernel/time/hrtimer.c:1105
 __run_hrtimer kernel/time/hrtimer.c:1764 [inline]
 __hrtimer_run_queues+0x68e/0xd60 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_emit_next_record+0xab0/0xc90 kernel/printk/printk.c:2786
Code: 06 5e 1a 00 4d 85 ff 75 16 e8 fc 5d 1a 00 eb 15 e8 f5 5d 1a 00 e8 b0 ea a9 08 4d 85 ff 74 ea e8 e6 5d 1a 00 fb 48 8b 5c 24 48 <48> c7 84 24 80 00 00 00 0e 36 e0 45 4a c7 04 2b 00 00 00 00 4a c7
RSP: 0018:ffffc90004a9f4c0 EFLAGS: 00000287
RAX: ffffffff816681ea RBX: 1ffff92000953ea8 RCX: 0000000000080000
RDX: ffffc9000e1bb000 RSI: 00000000000013a8 RDI: 00000000000013a9
RBP: ffffc90004a9f700 R08: dffffc0000000000 R09: fffffbfff2119049
R10: fffffbfff2119049 R11: 1ffffffff2119048 R12: ffffffff81667f6d
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000200
 console_flush_all kernel/printk/printk.c:-1 [inline]
 console_unlock+0x223/0x630 kernel/printk/printk.c:2906
 vprintk_emit+0x489/0x680 kernel/printk/printk.c:2303
 _printk+0xcc/0x110 kernel/printk/printk.c:2328
 logfc+0x3cd/0x4c0 fs/fs_context.c:-1
 fs_param_bad_value fs/fs_parser.c:194 [inline]
 fs_param_is_u32+0x1a6/0x220 fs/fs_parser.c:-1
 __fs_parse+0x3b4/0x720 fs/fs_parser.c:128
 fs_parse include/linux/fs_parser.h:73 [inline]
 fuse_parse_param+0x18b/0xaf0 fs/fuse/inode.c:741
 vfs_parse_fs_param+0x19c/0x420 fs/fs_context.c:146
 vfs_parse_fs_string fs/fs_context.c:184 [inline]
 generic_parse_monolithic+0x25f/0x320 fs/fs_context.c:224
 do_new_mount+0x21a/0xa40 fs/namespace.c:3074
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f529fd90eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f52a0b5be68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f52a0b5bef0 RCX: 00007f529fd90eea
RDX: 00002000000007c0 RSI: 0000200000000800 RDI: 0000000000000000
RBP: 00002000000007c0 R08: 00007f52a0b5bef0 R09: 0000000000000c00
R10: 0000000000000c00 R11: 0000000000000246 R12: 0000200000000800
R13: 00007f52a0b5beb0 R14: 0000000000000000 R15: 0000200000000880
 </TASK>
rcu: rcu_preempt kthread starved for 10445 jiffies! g16089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5321 Comm: syz.2.284 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0xe7b/0x1270 kernel/smp.c:998
Code: 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 5d d9 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 e9 d5 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 ce d5 0a
RSP: 0018:ffffc900049afb00 EFLAGS: 00000246
RAX: ffffffff81760a02 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000cd29000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900049afc60 R08: dffffc0000000000 R09: fffffbfff2119054
R10: fffffbfff2119054 R11: 1ffffffff2119053 R12: 1ffff110171e81c9
R13: ffff8880b8e3bb80 R14: 0000000000000001 R15: ffff8880b8f40e48
FS:  00007fcb2a0c66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f973b99a000 CR3: 00000000761be000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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+0x1ca/0x250 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:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcb2918e3aa
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 43 91 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 a3 91 02 00 8b 44 24
RSP: 002b:00007fcb2a0c5e50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007fcb2a0c5ef0 RCX: 00007fcb2918e3aa
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000200000000100 R08: 0000000000000000 R09: 00000000000002ff
R10: 0000000000000000 R11: 0000000000000293 R12: 00002000000003c0
R13: 00007fcb2a0c5eb0 R14: 0000000000000305 R15: 0000200000001d80
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 226s! [syz.2.284:5321]
Modules linked in:
irq event stamp: 49480
hardirqs last  enabled at (49479): [<ffffffff8a200d46>] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
hardirqs last disabled at (49480): [<ffffffff8a1065da>] sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1118
softirqs last  enabled at (1392): [<ffffffff814e857f>] __do_softirq kernel/softirq.c:630 [inline]
softirqs last  enabled at (1392): [<ffffffff814e857f>] invoke_softirq kernel/softirq.c:470 [inline]
softirqs last  enabled at (1392): [<ffffffff814e857f>] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
softirqs last disabled at (1217): [<ffffffff814e857f>] __do_softirq kernel/softirq.c:630 [inline]
softirqs last disabled at (1217): [<ffffffff814e857f>] invoke_softirq kernel/softirq.c:470 [inline]
softirqs last disabled at (1217): [<ffffffff814e857f>] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
CPU: 0 PID: 5321 Comm: syz.2.284 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0xe7b/0x1270 kernel/smp.c:998
Code: 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 5d d9 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 e9 d5 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 ce d5 0a
RSP: 0018:ffffc900049afb00 EFLAGS: 00000246
RAX: ffffffff81760a02 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000cd29000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900049afc60 R08: dffffc0000000000 R09: fffffbfff2119054
R10: fffffbfff2119054 R11: 1ffffffff2119053 R12: 1ffff110171e81c9
R13: ffff8880b8e3bb80 R14: 0000000000000001 R15: ffff8880b8f40e48
FS:  00007fcb2a0c66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f973b99a000 CR3: 00000000761be000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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+0x1ca/0x250 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:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcb2918e3aa
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 43 91 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 a3 91 02 00 8b 44 24
RSP: 002b:00007fcb2a0c5e50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007fcb2a0c5ef0 RCX: 00007fcb2918e3aa
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000200000000100 R08: 0000000000000000 R09: 00000000000002ff
R10: 0000000000000000 R11: 0000000000000293 R12: 00002000000003c0
R13: 00007fcb2a0c5eb0 R14: 0000000000000305 R15: 0000200000001d80
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5304 Comm: syz.3.282 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:rcu_is_watching+0x56/0xa0 kernel/rcu/tree.c:721
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 70 f2 65 00 48 c7 c3 c8 57 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 2f 8b 03 65 ff 0d 75 50 97 7e 74 0c 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc900001e0c60 EFLAGS: 00000806
RAX: 0000000000000000 RBX: ffff8880b8f357c8 RCX: edc82596d4649000
RDX: ffff88802e1f9dc0 RSI: ffffffff8abef900 RDI: ffffffff8abef8c0
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff2119049
R10: fffffbfff2119049 R11: 1ffffffff2119048 R12: ffff888072cbc2e8
R13: dffffc0000000000 R14: ffffffff8c3d8988 R15: dffffc0000000000
FS:  00007f52a0b5c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c332619 CR3: 000000005a630000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_lock include/linux/rcupdate.h:792 [inline]
 advance_sched+0x705/0x970 net/sched/sch_taprio.c:753
 __run_hrtimer kernel/time/hrtimer.c:1747 [inline]
 __hrtimer_run_queues+0x554/0xd60 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_emit_next_record+0xab0/0xc90 kernel/printk/printk.c:2786
Code: 06 5e 1a 00 4d 85 ff 75 16 e8 fc 5d 1a 00 eb 15 e8 f5 5d 1a 00 e8 b0 ea a9 08 4d 85 ff 74 ea e8 e6 5d 1a 00 fb 48 8b 5c 24 48 <48> c7 84 24 80 00 00 00 0e 36 e0 45 4a c7 04 2b 00 00 00 00 4a c7
RSP: 0018:ffffc90004a9f4c0 EFLAGS: 00000287
RAX: ffffffff816681ea RBX: 1ffff92000953ea8 RCX: 0000000000080000
RDX: ffffc9000e1bb000 RSI: 00000000000013a8 RDI: 00000000000013a9
RBP: ffffc90004a9f700 R08: dffffc0000000000 R09: fffffbfff2119049
R10: fffffbfff2119049 R11: 1ffffffff2119048 R12: ffffffff81667f6d
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000200
 console_flush_all kernel/printk/printk.c:-1 [inline]
 console_unlock+0x223/0x630 kernel/printk/printk.c:2906
 vprintk_emit+0x489/0x680 kernel/printk/printk.c:2303
 _printk+0xcc/0x110 kernel/printk/printk.c:2328
 logfc+0x3cd/0x4c0 fs/fs_context.c:-1
 fs_param_bad_value fs/fs_parser.c:194 [inline]
 fs_param_is_u32+0x1a6/0x220 fs/fs_parser.c:-1
 __fs_parse+0x3b4/0x720 fs/fs_parser.c:128
 fs_parse include/linux/fs_parser.h:73 [inline]
 fuse_parse_param+0x18b/0xaf0 fs/fuse/inode.c:741
 vfs_parse_fs_param+0x19c/0x420 fs/fs_context.c:146
 vfs_parse_fs_string fs/fs_context.c:184 [inline]
 generic_parse_monolithic+0x25f/0x320 fs/fs_context.c:224
 do_new_mount+0x21a/0xa40 fs/namespace.c:3074
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f529fd90eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f52a0b5be68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f52a0b5bef0 RCX: 00007f529fd90eea
RDX: 00002000000007c0 RSI: 0000200000000800 RDI: 0000000000000000
RBP: 00002000000007c0 R08: 00007f52a0b5bef0 R09: 0000000000000c00
R10: 0000000000000c00 R11: 0000000000000246 R12: 0000200000000800
R13: 00007f52a0b5beb0 R14: 0000000000000000 R15: 0000200000000880
 </TASK>