rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6135/1:b..l P5964/2:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=14189, q=315 ncpus=2)
task:syz-executor    state:R  running task     stack:19496 pid:5964  tgid:5964  ppid:5963   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:228 [inline]
RIP: 0010:unwind_next_frame+0x214/0x23d0 arch/x86/kernel/unwind_orc.c:510
Code: ef 08 8b 15 6e 32 47 0c 8d 42 ff 44 39 f8 0f 86 78 04 00 00 44 89 f8 4c 8d 2c 85 f8 f5 e0 90 4c 89 e8 48 c1 e8 03 0f b6 04 28 <84> c0 48 89 eb 0f 85 2c 1c 00 00 45 8b 6d 00 44 89 f8 ff c0 48 8d
RSP: 0018:ffffc900043eed38 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 0000000000000001 RCX: a87a6bbecf920600
RDX: 00000000000a60ce RSI: ffffffff8be075c0 RDI: ffffffff8be07580
RBP: dffffc0000000000 R08: ffffffff81742f85 R09: ffffffff8e13f8a0
R10: ffffc900043eee58 R11: ffffffff81ad9f20 R12: ffffffff8aa4f9ce
R13: ffffffff910789dc R14: ffffc900043eee08 R15: 000000000009a4f9
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5780
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 sctp_inet6addr_event+0x37f/0x740 net/sctp/ipv6.c:86
 notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:223
 ipv6_add_addr+0xda9/0x1090 net/ipv6/addrconf.c:1186
 inet6_addr_add+0x3c3/0xce0 net/ipv6/addrconf.c:3050
 inet6_rtm_newaddr+0x93d/0xd20 net/ipv6/addrconf.c:5059
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:737
 __sock_sendmsg net/socket.c:752 [inline]
 __sys_sendto+0x3ce/0x540 net/socket.c:2221
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2224
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f30ce1915dc
RSP: 002b:00007ffc905dd720 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f30cef14620 RCX: 00007f30ce1915dc
RDX: 0000000000000040 RSI: 00007f30cef14670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc905dd774 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f30cef14670 R15: 0000000000000000
 </TASK>
task:sed             state:R  running task     stack:24312 pid:6135  tgid:6135  ppid:6134   task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:-1 [inline]
RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline]
RIP: 0010:atomic64_read include/linux/atomic/atomic-instrumented.h:1611 [inline]
RIP: 0010:ktime_get_coarse_real_ts64_mg+0x37/0x1e0 kernel/time/timekeeping.c:2445
Code: 53 48 83 ec 10 48 89 fb e8 36 04 12 00 48 c7 c7 c0 12 e1 8d be 08 00 00 00 e8 65 62 78 00 48 8b 05 5e 4d 31 0c 48 89 44 24 08 <4c> 8d 73 08 49 89 dd 49 c1 ed 03 4c 89 f0 48 c1 e8 03 48 89 04 24
RSP: 0018:ffffc900034d75b8 EFLAGS: 00000256
RAX: 000000261054af24 RBX: ffffc900034d7640 RCX: ffffffff81afc55b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8de112c0
RBP: ffffc900034d76b8 R08: ffffffff8de112c7 R09: 1ffffffff1bc2258
R10: dffffc0000000000 R11: fffffbfff1bc2259 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffc900034d7640 R15: dffffc0000000000
 current_time+0x8e/0x360 fs/inode.c:2343
 atime_needs_update+0x320/0x6d0 fs/inode.c:2206
 pick_link+0x549/0xfa0 fs/namei.c:1983
 step_into_slowpath+0x53b/0x7d0 fs/namei.c:2066
 step_into fs/namei.c:2091 [inline]
 walk_component fs/namei.c:2227 [inline]
 link_path_walk+0xd50/0x18d0 fs/namei.c:2589
 path_openat+0x2b0/0x3840 fs/namei.c:4782
 do_filp_open+0x1fa/0x410 fs/namei.c:4813
 do_sys_openat2+0x121/0x200 fs/open.c:1391
 do_sys_open fs/open.c:1397 [inline]
 __do_sys_openat fs/open.c:1413 [inline]
 __se_sys_openat fs/open.c:1408 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1408
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabfcd360ba
RSP: 002b:00007fff94803a88 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fff94803b00 RCX: 00007fabfcd360ba
RDX: 0000000000080000 RSI: 00007fff94803b00 RDI: 00000000ffffff9c
RBP: 00007fff94803af0 R08: 00007fff94803cf7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000017
R13: 00007fabfcd0a000 R14: 00007fff94803d10 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10598 jiffies! g14189 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:27168 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 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+0x599/0xb30 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: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 4e 2b 00 f3 0f 1e fa fb f4 <e9> 48 ee 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: fcd00228fb9d7700 RBX: ffffffff8197888a RCX: fcd00228fb9d7700
RDX: 0000000000000001 RSI: ffffffff8d99597b RDI: ffffffff8be075e0
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8fa20e70
R13: 1ffff11003adcb70 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d2d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fabfca09a10 CR3: 0000000076504000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ea/0x520 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>