rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6679/1:b.el
rcu: 	(detected by 0, t=12266 jiffies, g=18413, q=1515 ncpus=2)
task:sed             state:R  running task     stack:26016 pid:6679  tgid:6679  ppid:6678   task_flags:0x400000 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7188
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:753
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x4b/0x3d0 kernel/locking/lockdep.c:5879
 rcu_lock_release include/linux/rcupdate.h:322 [inline]
 rcu_read_unlock include/linux/rcupdate.h:881 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1193 [inline]
 unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 slab_free_hook mm/slub.c:2646 [inline]
 slab_free mm/slub.c:6165 [inline]
 kmem_cache_free+0x426/0x630 mm/slub.c:6295
 remove_vma mm/vma.c:470 [inline]
 vms_complete_munmap_vmas+0x929/0xc60 mm/vma.c:1342
 __mmap_complete+0x7b/0x5e0 mm/vma.c:2588
 __mmap_region mm/vma.c:2768 [inline]
 mmap_region+0x15ee/0x22a0 mm/vma.c:2844
 do_mmap+0xc39/0x10c0 mm/mmap.c:559
 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581
 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:605
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75a295d242
RSP: 002b:00007ffd95038278 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f75a2905000 RCX: 00007f75a295d242
RDX: 0000000000000001 RSI: 0000000000028000 RDI: 00007f75a2905000
RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000096000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd95038300
R13: 00007f75a29310c0 R14: 00007ffd95038680 R15: 00000fffb2a07052
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 7551 jiffies! g18413 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7804
rcu: rcu_preempt kthread starved for 7552 jiffies! g18413 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27656 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6362 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d e4 1f 59 0c 48 89 de 5b e9 13 9f 5e 00 cc cc cc 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 0d 08 b0 57 11 65 8b 15 29 b0 57
RSP: 0018:ffffc90000a08d00 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff88807d8f1300 RCX: 0000000000010003
RDX: ffff88802709bd00 RSI: ffffffff8c27d460 RDI: ffffffff8c27d420
RBP: 0000000000000001 R08: ffffffff9011cab7 R09: 1ffffffff2023956
R10: dffffc0000000000 R11: fffffbfff2023957 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880b8728380 R15: 0000000000000000
FS:  00005555688c6500(0000) GS:ffff88812554a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d0f27dba38 CR3: 000000007d4c2000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 trace_hrtimer_start include/trace/events/timer.h:222 [inline]
 debug_activate kernel/time/hrtimer.c:486 [inline]
 enqueue_hrtimer+0xaa/0x3c0 kernel/time/hrtimer.c:1089
 __run_hrtimer kernel/time/hrtimer.c:1802 [inline]
 __hrtimer_run_queues+0x650/0xcc0 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:82 [inline]
RIP: 0010:atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline]
RIP: 0010:__mutex_owner kernel/locking/mutex.h:47 [inline]
RIP: 0010:mutex_spin_on_owner+0x24a/0x320 kernel/locking/mutex.c:363
Code: f8 8e 00 48 8b 44 24 18 42 80 3c 30 00 74 08 4c 89 e7 e8 59 f6 8e 00 49 f7 04 24 01 00 00 00 0f 85 90 00 00 00 f3 90 4c 89 e7 <be> 08 00 00 00 e8 ac f8 8e 00 48 8b 44 24 18 42 80 3c 30 00 0f 84
RSP: 0018:ffffc900039075d0 EFLAGS: 00000246
RAX: 1ffff11004e137a0 RBX: ffffffff8fbcae70 RCX: ffffffff81a10c04
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fbcade0
RBP: ffffffff8fbcae30 R08: ffffffff8fbcade7 R09: 1ffffffff1f795bc
R10: dffffc0000000000 R11: fffffbfff1f795bd R12: ffffffff8fbcade0
R13: ffff888032e70000 R14: dffffc0000000000 R15: ffffffff8fbcae30
 mutex_optimistic_spin kernel/locking/mutex.c:480 [inline]
 __mutex_lock_common kernel/locking/mutex.c:618 [inline]
 __mutex_lock+0x2f5/0x1300 kernel/locking/mutex.c:776
 rtnl_lock net/core/rtnetlink.c:80 [inline]
 rtnetlink_rcv_msg+0x722/0xbe0 net/core/rtnetlink.c:7000
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:721 [inline]
 __sock_sendmsg net/socket.c:736 [inline]
 __sys_sendto+0x672/0x710 net/socket.c:2199
 __do_sys_sendto net/socket.c:2206 [inline]
 __se_sys_sendto net/socket.c:2202 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2202
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee2b74810e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffea97c0958 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00005555688c6500 RCX: 00007fee2b74810e
RDX: 0000000000000020 RSI: 00007fee2c484670 RDI: 0000000000000005
RBP: 0000000000000001 R08: 00007ffea97c09d4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00007ffea97c0a3c R14: 00007fee2c484670 R15: 0000000000000000
 </TASK>