rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5168/1:b..l rcu: (detected by 1, t=10503 jiffies, g=12417, q=1324 ncpus=2) task:jbd2/sda1-8 state:R running task stack:24912 pid:5168 tgid:5168 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__outw arch/x86/include/asm/shared/io.h:23 [inline] RIP: 0010:iowrite16+0x37/0x90 lib/iomap.c:213 Code: bb d7 fc 48 81 fb 00 00 04 00 72 0a e8 02 bb d7 fc 66 89 2b eb 59 48 81 fb 01 00 01 00 72 0d e8 ef ba d7 fc 89 e8 89 da 66 ef <eb> 43 8b 2d f1 2b 41 0a 31 ff 89 ee e8 18 bf d7 fc 85 ed 74 2b e8 RSP: 0018:ffffc9000fe46e98 EFLAGS: 00000293 RAX: 0000000000000002 RBX: 000000000001c010 RCX: ffff888035040000 RDX: 000000000001c010 RSI: 000000000001c010 RDI: 0000000000000002 RBP: 0000000000000002 R08: ffffffff85393dbf R09: 1ffffffff2032f86 R10: dffffc0000000000 R11: ffffffff853ac2e0 R12: 1ffff110049396c8 R13: 1ffff92001fc8df0 R14: dffffc0000000000 R15: dffffc0000000000 vp_notify+0x57/0x80 drivers/virtio/virtio_pci_common.c:55 virtqueue_notify+0x6a/0xd0 drivers/virtio/virtio_ring.c:2490 virtscsi_add_cmd+0x5fc/0x6e0 drivers/scsi/virtio_scsi.c:512 virtscsi_queuecommand+0x694/0xaf0 drivers/scsi/virtio_scsi.c:602 scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1602 [inline] scsi_queue_rq+0x1d7c/0x2e70 drivers/scsi/scsi_lib.c:1844 blk_mq_dispatch_rq_list+0xad3/0x19d0 block/blk-mq.c:2118 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0xb8a/0x1840 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0xd6/0x190 block/blk-mq-sched.c:331 blk_mq_run_hw_queue+0x414/0x500 block/blk-mq.c:2352 blk_mq_flush_plug_list+0x118e/0x1870 block/blk-mq.c:2913 __blk_flush_plug+0x420/0x500 block/blk-core.c:1213 blk_finish_plug+0x5e/0x80 block/blk-core.c:1240 jbd2_journal_commit_transaction+0x33e7/0x6560 fs/jbd2/commit.c:790 kjournald2+0x41c/0x7b0 fs/jbd2/journal.c:201 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> rcu: rcu_preempt kthread starved for 1049 jiffies! g12417 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:25784 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5853 Code: 2b 00 74 08 4c 89 f7 e8 2a 23 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc900001e70a0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff9200003ce20 RCX: ffff88801d2f8ad8 RDX: dffffc0000000000 RSI: ffffffff8c0aa960 RDI: ffffffff8c5faee0 RBP: ffffc900001e71e8 R08: ffffffff942a4887 R09: 1ffffffff2854910 R10: dffffc0000000000 R11: fffffbfff2854911 R12: 1ffff9200003ce1c R13: dffffc0000000000 R14: ffffc900001e7100 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f60c5548ef8 CR3: 0000000032a5e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> </IRQ> <TASK> rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] nf_hook include/linux/netfilter.h:238 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] br_nf_pre_routing_ipv6+0x43f/0x770 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x14eb/0x4690 net/core/dev.c:5566 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5785 process_backlog+0x662/0x15b0 net/core/dev.c:6117 __napi_poll+0xcb/0x490 net/core/dev.c:6883 napi_poll net/core/dev.c:6952 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:7074 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 run_ksoftirqd+0xca/0x130 kernel/softirq.c:950 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK>