syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=db6c/1/0x4000000000000000 softirq=40638/40639 fqs=1
rcu: 	(detected by 1, t=10506 jiffies, g=37969, q=262 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11190 Comm: syz.3.1703 Not tainted 6.14.0-rc1-syzkaller-00235-g9946eaf552b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:srso_alias_safe_ret+0x5/0x7 arch/x86/lib/retpoline.S:174
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 48 8d 64 24 08 <c3> cc e8 f4 ff ff ff 0f 0b cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 0018:ffffc90000007d00 EFLAGS: 00000006
RAX: ffffffff8bf1c486 RBX: 0000000000000001 RCX: ffff88803538da00
RDX: 0000000000010000 RSI: ffff88802a4e4340 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8bf1c478 R09: 1ffffffff2036b8e
R10: dffffc0000000000 R11: fffffbfff2036b8f R12: 1ffff1100549c868
R13: ffff88802a4e4340 R14: ffff8880b862c650 R15: ffff8880b862c500
FS:  00007f25333416c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30315ff8 CR3: 0000000035266000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 timerqueue_del+0x56/0x100 lib/timerqueue.c:55
 __remove_hrtimer kernel/time/hrtimer.c:1133 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1781 [inline]
 __hrtimer_run_queues+0x3d0/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5855
Code: 2b 00 74 08 4c 89 f7 e8 5a 3d 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:ffffc900049673e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200092ce88 RCX: ffff88803538e4e8
RDX: dffffc0000000000 RSI: ffffffff8c0ab8e0 RDI: ffffffff8c608b40
RBP: ffffc90004967528 R08: ffffffff942f9a0f R09: 1ffffffff285f341
R10: dffffc0000000000 R11: fffffbfff285f342 R12: 1ffff9200092ce84
R13: dffffc0000000000 R14: ffffc90004967440 R15: 0000000000000246
 __fs_reclaim_acquire mm/page_alloc.c:3853 [inline]
 fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3867
 might_alloc include/linux/sched/mm.h:318 [inline]
 slab_pre_alloc_hook mm/slub.c:4066 [inline]
 slab_alloc_node mm/slub.c:4144 [inline]
 __kmalloc_cache_noprof+0x41/0x390 mm/slub.c:4320
 kmalloc_noprof include/linux/slab.h:901 [inline]
 udf_fiiter_find_entry+0x147/0x5e0 fs/udf/namei.c:62
 udf_rename+0x18b/0xf40 fs/udf/namei.c:779
 vfs_rename+0xbdd/0xf00 fs/namei.c:5069
 do_renameat2+0xd94/0x13f0 fs/namei.c:5226
 __do_sys_renameat2 fs/namei.c:5260 [inline]
 __se_sys_renameat2 fs/namei.c:5257 [inline]
 __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5257
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f253258cde9
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:00007f2533341038 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007f25327a5fa0 RCX: 00007f253258cde9
RDX: ffffffffffffff9c RSI: 0000400000000240 RDI: ffffffffffffff9c
RBP: 00007f253260e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00004000000005c0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f25327a5fa0 R15: 00007ffe9d1f5148
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g37969 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:25808 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6856
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 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: 11165 Comm: syz.4.1695 Not tainted 6.14.0-rc1-syzkaller-00235-g9946eaf552b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d c4 f3 71 0c 48 89 de 5b e9 63 4f 5b 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 80 d6 03 00 65 8b 15 d0 76
RSP: 0018:ffffc90000a16d38 EFLAGS: 00000246
RAX: 0000000000000100 RBX: 0000000000000001 RCX: ffff88802c098000
RDX: ffff88802c098000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90000a16fb8 R08: ffffffff855f98be R09: 1ffffffff2036b8e
R10: dffffc0000000000 R11: fffffbfff2036b8f R12: 0000000000000009
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000009
FS:  00007f8f3615d6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5c2ed56c0 CR3: 000000002f8de000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 virtqueue_add_split drivers/virtio/virtio_ring.c:616 [inline]
 virtqueue_add+0x184a/0x4770 drivers/virtio/virtio_ring.c:2282
 virtqueue_add_outbuf+0xc3/0x110 drivers/virtio/virtio_ring.c:2339
 virtnet_add_outbuf drivers/net/virtio_net.c:567 [inline]
 xmit_skb drivers/net/virtio_net.c:3241 [inline]
 start_xmit+0x109f/0x23d0 drivers/net/virtio_net.c:3270
 __netdev_start_xmit include/linux/netdevice.h:5144 [inline]
 netdev_start_xmit include/linux/netdevice.h:5153 [inline]
 xmit_one net/core/dev.c:3735 [inline]
 dev_hard_start_xmit+0x27c/0x7d0 net/core/dev.c:3751
 sch_direct_xmit+0x29c/0x5d0 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:3974 [inline]
 __dev_queue_xmit+0x1a8f/0x3f50 net/core/dev.c:4550
 dev_queue_xmit include/linux/netdevice.h:3305 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0xd76/0x12b0 net/ipv4/ip_output.c:236
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1258/0x1d50 net/ipv4/ip_output.c:528
 __tcp_transmit_skb+0x2582/0x3ca0 net/ipv4/tcp_output.c:1471
 tcp_rcv_established+0x1420/0x1f20 net/ipv4/tcp_input.c:6245
 tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1918
 tcp_v4_rcv+0x2dc0/0x37f0 net/ipv4/tcp_ipv4.c:2353
 ip_protocol_deliver_rcu+0x22e/0x440 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x341/0x5f0 net/ipv4/ip_input.c:233
 NF_HOOK+0x3a6/0x450 include/linux/netfilter.h:314
 ip_local_deliver net/ipv4/ip_input.c:254 [inline]
 dst_input include/net/dst.h:469 [inline]
 ip_sublist_rcv_finish+0x3be/0x4f0 net/ipv4/ip_input.c:578
 ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline]
 ip_sublist_rcv+0x75d/0xab0 net/ipv4/ip_input.c:635
 ip_list_rcv+0x42b/0x480 net/ipv4/ip_input.c:669
 __netif_receive_skb_list_ptype net/core/dev.c:5871 [inline]
 __netif_receive_skb_list_core+0x94e/0x980 net/core/dev.c:5918
 __netif_receive_skb_list net/core/dev.c:5970 [inline]
 netif_receive_skb_list_internal+0xa51/0xe30 net/core/dev.c:6061
 gro_normal_list include/net/gro.h:515 [inline]
 napi_complete_done+0x2b5/0x870 net/core/dev.c:6428
 virtqueue_napi_complete drivers/net/virtio_net.c:759 [inline]
 virtnet_poll+0x2de9/0x39b0 drivers/net/virtio_net.c:3014
 __napi_poll+0xcd/0x490 net/core/dev.c:7106
 napi_poll net/core/dev.c:7175 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:7297
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 common_interrupt+0xb9/0xd0 arch/x86/kernel/irq.c:278
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d c4 f3 71 0c 48 89 de 5b e9 63 4f 5b 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 80 d6 03 00 65 8b 15 d0 76 44 7e 81 e2 00 01 ff 00
RSP: 0018:ffffc90004e8f4d8 EFLAGS: 00000202
RAX: ffffffff81b37b65 RBX: 1ffff110170c8c99 RCX: 0000000000080000
RDX: ffffc9000d55c000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90004e8f6e0 R08: ffffffff81b37b30 R09: 1ffffffff285f30e
R10: dffffc0000000000 R11: fffffbfff285f30f R12: ffff8880b873fb48
R13: ffff8880b86464c8 R14: ffff8880b873fb40 R15: 0000000000000000
 csd_lock_wait kernel/smp.c:340 [inline]
 smp_call_function_many_cond+0x1bc5/0x2d30 kernel/smp.c:885
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:966 [inline]
 flush_tlb_mm_range+0x42d/0x710 arch/x86/mm/tlb.c:1054
 tlb_flush arch/x86/include/asm/tlb.h:20 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:481 [inline]
 tlb_flush_mmu+0x1aa/0x680 mm/mmu_gather.c:395
 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:488
 vms_clear_ptes+0x432/0x530 mm/vma.c:1144
 vms_complete_munmap_vmas+0x210/0x8f0 mm/vma.c:1186
 do_vmi_align_munmap+0x5ef/0x6f0 mm/vma.c:1445
 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1493
 __vm_munmap+0x372/0x510 mm/vma.c:2951
 __do_sys_munmap mm/mmap.c:1084 [inline]
 __se_sys_munmap mm/mmap.c:1081 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:1081
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8f3538ce77
Code: 00 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 0b 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:00007f8f3615ce18 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 00000000013bd7ef RCX: 00007f8f3538ce77
RDX: 0000000000000000 RSI: 0000000008400000 RDI: 00007f8f2ac00000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005585
R10: 00000000000003cc R11: 0000000000000246 R12: 0000000000000003
R13: 00007f8f3615cef0 R14: 00007f8f3615ceb0 R15: 00007f8f2ac00000
 </TASK>