rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5155/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=35181, q=484 ncpus=2)
task:jbd2/sda1-8     state:R  running task     stack:24000 pid:5155  tgid:5155  ppid:2      task_flags:0x20240040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190
 irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:iowrite16+0x37/0x80 lib/iomap.c:214
Code: c3 29 fd 48 81 fb 00 00 04 00 72 0a e8 52 c3 29 fd 66 89 2b eb 53 48 81 fb 01 00 01 00 72 0d e8 3f c3 29 fd 89 e8 89 da 66 ef <eb> 3d 8b 2d e1 e8 d1 09 31 ff 89 ee e8 68 c7 29 fd 85 ed 74 25 e8
RSP: 0018:ffffc9000ecbee00 EFLAGS: 00000293
RAX: 0000000000000002 RBX: 000000000001c010 RCX: ffff888030f1bd00
RDX: 000000000001c010 RSI: 000000000001c010 RDI: 0000000000000002
RBP: 0000000000000002 R08: ffffffff8f823177 R09: 1ffffffff1f0462e
R10: dffffc0000000000 R11: ffffffff8505fb80 R12: 1ffff11003f6b3c8
R13: 1ffff92001d97dd8 R14: dffffc0000000000 R15: dffffc0000000000
 vp_notify+0x57/0x80 drivers/virtio/virtio_pci_common.c:55
 virtqueue_notify+0x60/0xc0 drivers/virtio/virtio_ring.c:2493
 virtscsi_add_cmd+0x54c/0x630 drivers/scsi/virtio_scsi.c:511
 virtscsi_queuecommand+0x6d3/0xbd0 drivers/scsi/virtio_scsi.c:601
 scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1638 [inline]
 scsi_queue_rq+0x18bc/0x30d0 drivers/scsi/scsi_lib.c:1895
 blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2138
 __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+0xdac/0x1570 block/blk-mq-sched.c:307
 blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
 blk_mq_run_hw_queue+0x404/0x4f0 block/blk-mq.c:2376
 blk_mq_dispatch_list+0xd0b/0xe00 include/linux/spinlock.h:-1
 blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2987
 __blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1225
 blk_finish_plug+0x5e/0x90 block/blk-core.c:1252
 jbd2_journal_commit_transaction+0x2c71/0x5950 fs/jbd2/commit.c:788
 kjournald2+0x3cf/0x750 fs/jbd2/journal.c:201
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: rcu_preempt kthread starved for 10558 jiffies! g35181 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:27480 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 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+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 11197 Comm: syz.5.1534 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:get_signal+0x1a/0x1340 kernel/signal.c:2800
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 55 41 57 41 56 41 55 41 54 53 48 81 ec b8 00 00 00 48 89 7c 24 60 <65> 48 8b 05 be a5 f8 10 48 89 84 24 b0 00 00 00 48 bb 00 00 00 00
RSP: 0018:ffffc9001e81fc90 EFLAGS: 00000286
RAX: ffffc9001e81fdc0 RBX: ffffc9001e81ff48 RCX: 0000000000000000
RDX: 0000000000000058 RSI: 0000000000000000 RDI: ffffc9001e81fdc0
RBP: ffffc9001e81fe90 R08: ffffc9001e81fe17 R09: ffffc9001e81fdc0
R10: dffffc0000000000 R11: fffff52003d03fc3 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffc9001e81fdc0 R15: ffff88801af7db80
FS:  00007f5a80e3f6c0(0000) GS:ffff888125f1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30b22ff8 CR3: 0000000078c1f000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a7ff8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f5a80e3f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 00007f5a801e5fa0 RCX: 00007f5a7ff8f749
RDX: 00000000000000e9 RSI: 0000200000001600 RDI: 0000000000000003
RBP: 00007f5a80013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a801e6038 R14: 00007f5a801e5fa0 R15: 00007ffdc5492c48
 </TASK>