rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4681/1:b..l P5235/1:b..l P10246/3:b..l P5227/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=23449, q=309 ncpus=2)
task:syz-executor    state:R
  running task     stack:20448 pid:5227  tgid:5227  ppid:5221   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6675
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6997
 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:mtree_range_walk+0x2c8/0x8e0 lib/maple_tree.c:2783
Code: 89 ef 48 89 de e8 c8 f7 da f5 49 39 dd 0f 83 b9 00 00 00 49 8d 04 2f 48 83 f8 01 0f 84 c6 00 00 00 e8 4c f5 da f5 49 83 c4 08 <48> ff c5 eb ad e8 3e f5 da f5 e9 85 00 00 00 41 80 3c 24 00 74 07
RSP: 0018:ffffc900041cfa70 EFLAGS: 00000286
RAX: ffffffff8bb9bf24 RBX: 0000000000000006 RCX: ffff88802be33c00
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004
RBP: 0000000000000003 R08: ffffffff8bb9bf08 R09: ffffffff8bb9bd52
R10: 0000000000000003 R11: ffff88802be33c00 R12: ffff88805da4a228
R13: 0000000000000004 R14: ffff88805da4a208 R15: fffffffffffffffc
 mas_state_walk lib/maple_tree.c:3601 [inline]
 mas_walk lib/maple_tree.c:4948 [inline]
 mas_find_setup lib/maple_tree.c:6015 [inline]
 mas_find+0x73d/0xbb0 lib/maple_tree.c:6055
 offset_find_next fs/libfs.c:501 [inline]
 offset_iterate_dir fs/libfs.c:528 [inline]
 offset_readdir+0x64a/0xac0 fs/libfs.c:578
 iterate_dir+0x573/0x800 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392
 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: 0033:0x7fe8007b00d3
RSP: 002b:00007ffc236c08a8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055555b3c95c0 RCX: 00007fe8007b00d3
RDX: 0000000000008000 RSI: 000055555b3c95c0 RDI: 0000000000000003
RBP: 000055555b3c9594 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000016 R14: 000055555b3c9590 R15: 00007ffc236c1a60
 </TASK>
task:syz-executor    state:R  running task     stack:26816 pid:10246 tgid:10246 ppid:5224   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6675
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6854
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6878
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 filemap_map_pages+0x1759/0x20d0 mm/filemap.c:3684
 do_fault_around mm/memory.c:5240 [inline]
 do_read_fault mm/memory.c:5273 [inline]
 do_fault mm/memory.c:5416 [inline]
 do_pte_missing mm/memory.c:3965 [inline]
 handle_pte_fault+0x2b9a/0x6800 mm/memory.c:5751
 __handle_mm_fault mm/memory.c:5894 [inline]
 handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6062
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fef8c185f20
RSP: 002b:00007fffb57e2cd8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fef8c30aca0
RDX: 0000000000000000 RSI: 00007fef8c30aca0 RDI: 00007fffb57e2ce0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000555585d227d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000343bf R14: 0000000000034357 R15: 00007fffb57e2e60
 </TASK>
task:syz-executor    state:R  running task     stack:20448 pid:5235  tgid:5235  ppid:5222   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6675
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6854
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6878
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1194 [inline]
 copy_pmd_range+0x7b90/0x85f0 mm/memory.c:1255
 copy_pud_range mm/memory.c:1292 [inline]
 copy_p4d_range mm/memory.c:1316 [inline]
 copy_page_range+0x99f/0xe90 mm/memory.c:1414
 dup_mmap kernel/fork.c:750 [inline]
 dup_mm kernel/fork.c:1674 [inline]
 copy_mm+0x11fb/0x1f40 kernel/fork.c:1723
 copy_process+0x1845/0x3d50 kernel/fork.c:2375
 kernel_clone+0x226/0x8f0 kernel/fork.c:2787
 __do_sys_clone kernel/fork.c:2930 [inline]
 __se_sys_clone kernel/fork.c:2914 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2914
 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: 0033:0x7fe1fa974793
RSP: 002b:00007ffc04974da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe1fa974793
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00005555592297d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000343a2 R14: 0000000000034351 R15: 00007ffc04974f30
 </TASK>
task:udevd           state:R  running task     stack:21664 pid:4681  tgid:4681  ppid:1      flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6675
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6854
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6878
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 __d_lookup+0x64b/0x7b0 fs/dcache.c:2339
 lookup_fast+0x74/0x4a0 fs/namei.c:1690
 walk_component fs/namei.c:2049 [inline]
 link_path_walk+0x672/0xea0 fs/namei.c:2418
 path_lookupat+0xa9/0x450 fs/namei.c:2579
 filename_lookup+0x256/0x610 fs/namei.c:2609
 do_readlinkat+0xf0/0x3a0 fs/stat.c:537
 __do_sys_readlink fs/stat.c:574 [inline]
 __se_sys_readlink fs/stat.c:571 [inline]
 __x64_sys_readlink+0x7f/0x90 fs/stat.c:571
 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: 0033:0x7fa8ae361d47
RSP: 002b:00007ffde4d3a458 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffde4d3a468 RCX: 00007fa8ae361d47
RDX: 0000000000000400 RSI: 00007ffde4d3a468 RDI: 00007ffde4d3a948
RBP: 0000000000000400 R08: 0000556f8fabd014 R09: 0000000000000000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffde4d3a948
R13: 00007ffde4d3a8b8 R14: 0000556f8faaa910 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10634 jiffies! g23449 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:25200 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6675
 __schedule_loop kernel/sched/core.c:6752 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6767
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/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: 0 UID: 0 PID: 5289 Comm: kworker/0:4 Not tainted 6.11.0-syzkaller-11558-g075dbe9f6e3c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:skb_dst_set_noref include/linux/skbuff.h:1176 [inline]
RIP: 0010:ip6_route_input+0x8de/0xd90 net/ipv6/route.c:2596
Code: 08 0f 85 ab 02 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 bd 02 00 00 4c 89 7c 24 28 4d 85 ff 41 0f 95 c6 44 8b 3a <44> 89 fb 81 e3 00 00 00 08 31 ff 89 de e8 a0 d0 2b f7 48 8b 54 24
RSP: 0018:ffffc900000069e0 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88805d98bc00
RDX: ffff88814c4a3441 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000006bb8 R08: ffffffff8a68e78c R09: 1ffffffff2039b65
R10: dffffc0000000000 R11: fffffbfff2039b66 R12: 1ffff11029894688
R13: dffffc0000000000 R14: ffff88814c4a3401 R15: 0000000008000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c2fe318da CR3: 0000000027fde000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 ip6_rcv_finish+0x144/0x180 net/ipv6/ip6_input.c:77
 ip_sabotage_in+0x205/0x290 net/bridge/br_netfilter_hooks.c:1013
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc5/0x220 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
 __netif_receive_skb_one_core net/core/dev.c:5662 [inline]
 __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5775
 netif_receive_skb_internal net/core/dev.c:5861 [inline]
 netif_receive_skb+0x1e8/0x890 net/core/dev.c:5920
 NF_HOOK+0xa0/0x400 include/linux/netfilter.h:314
 br_handle_frame_finish+0x18ed/0x1fe0
 br_nf_hook_thresh+0x474/0x590
 br_nf_pre_routing_finish_ipv6+0xaa0/0xdd0
 NF_HOOK include/linux/netfilter.h:314 [inline]
 br_nf_pre_routing_ipv6+0x379/0x770 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+0x9ff/0x1530 net/bridge/br_input.c:424
 __netif_receive_skb_core+0x13ea/0x4570 net/core/dev.c:5556
 __netif_receive_skb_one_core net/core/dev.c:5660 [inline]
 __netif_receive_skb+0x12f/0x650 net/core/dev.c:5775
 process_backlog+0x662/0x15b0 net/core/dev.c:6107
 __napi_poll+0xcd/0x490 net/core/dev.c:6771
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6962
 handle_softirqs+0x2c7/0x980 kernel/softirq.c:554
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline]
 nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa65/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:82:22:f7:f1:c9:26, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:82:22:f7:f1:c9:26, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)