rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=f88c/1/0x4000000000000000 softirq=22603/22603 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=16261, q=389 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 56 Comm: kworker/1:1H Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: kblockd blk_mq_run_work_fn
RIP: 0010:lock_is_held_type+0x1f/0x190 kernel/locking/lockdep.c:5925
Code: 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 05 26 1b 28 07 48 89 44 24 08 <bb> ff ff ff ff 83 3d 85 14 37 04 00 0f 84 fe 00 00 00 65 8b 05 58
RSP: 0018:ffffc90000a08c28 EFLAGS: 00000086
RAX: 6e8bb0624cfb7a00 RBX: 0000000000000001 RCX: 0000000000010000
RDX: ffff88801a1d3c80 RSI: 00000000ffffffff RDI: ffff88802634e280
RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200014117c R12: ffff88802634e2c0
R13: ffff88802634e000 R14: ffff88802634e2b0 R15: ffff8880300d5400
FS:  0000000000000000(0000) GS:ffff888126240000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7fecb68008 CR3: 000000007c250000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:249 [inline]
 advance_sched+0x1d2/0xc90 net/sched/sch_taprio.c:934
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 1b ad d0 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000131f170 EFLAGS: 00000206
RAX: 6e8bb0624cfb7a00 RBX: 0000000000000000 RCX: 6e8bb0624cfb7a00
RDX: 0000000000000000 RSI: ffffffff8d8f298a RDI: ffffffff8bbf0460
RBP: ffffffff846d0f4e R08: 0000000000000000 R09: ffffffff846d0f4e
R10: ffffc9000131f380 R11: fffff52000263e72 R12: 0000000000000002
R13: ffffffff8df3d3a0 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:958 [inline]
 pfn_valid include/linux/mmzone.h:2187 [inline]
 bvec_phys+0x18b/0x570 include/linux/bvec.h:295
 blk_map_iter_next+0x190/0xc80 block/blk-mq-dma.c:42
 __blk_rq_map_sg+0x3c3/0x5b0 block/blk-mq-dma.c:292
 scsi_alloc_sgtables+0x2ec/0xc40 drivers/scsi/scsi_lib.c:1151
 sd_setup_read_write_cmnd drivers/scsi/sd.c:1336 [inline]
 sd_init_command+0x558/0x1ff0 drivers/scsi/sd.c:1458
 scsi_prepare_cmd drivers/scsi/scsi_lib.c:1708 [inline]
 scsi_queue_rq+0x1771/0x2cc0 drivers/scsi/scsi_lib.c:1849
 blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2129
 __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+0xda4/0x1570 block/blk-mq-sched.c:307
 blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
 blk_mq_run_work_fn+0x22e/0x300 block/blk-mq.c:2543
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g16261 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7997
rcu: rcu_preempt kthread starved for 10502 jiffies! g16261 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27288 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>