syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=4d5c/1/0x4000000000000000 softirq=21795/21795 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7190/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=19653, q=283 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7168 Comm: syz.3.320 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:enqueue_hrtimer+0x111/0x380 kernel/time/hrtimer.c:1092
Code: 89 ee 83 e6 10 31 ff e8 bd 5a 12 00 83 e5 10 0f 84 b7 00 00 00 e8 af 57 12 00 4d 8d 7e 08 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 d9 00 00 00 45 8b 3f bf 20 00 00 00 44 89 fe e8 c7 5b
RSP: 0018:ffffc90000007d08 EFLAGS: 00000806
RAX: 0000000000000000 RBX: ffff88805aefa300 RCX: ffff88807d013c80
RDX: 0000000000010000 RSI: 0000000000000010 RDI: 0000000000000000
RBP: 0000000000000010 R08: ffffffff8fa2d9f7 R09: 1ffffffff1f45b3e
R10: dffffc0000000000 R11: fffffbfff1f45b3f R12: dffffc0000000000
R13: 1ffff110170c5070 R14: ffff8880b8628380 R15: ffff8880b8628388
FS:  00007f422d26f6c0(0000) GS:ffff888125bf9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5680572a60 CR3: 000000003068e000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1802 [inline]
 __hrtimer_run_queues+0x636/0xc30 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 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:lock_acquire+0x222/0x340 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 f0 41 c0 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 0a 10 04 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d a7 bf 07
RSP: 0018:ffffc9001ab66490 EFLAGS: 00000286
RAX: 0ad278b73ff9cd00 RBX: 0000000000000000 RCX: 0000000000000200
RDX: 00000000c37edec2 RSI: ffffffff8db8bddd RDI: ffffffff8be09760
RBP: ffffffff81d041a6 R08: ffffffff81d041a6 R09: ffffffff8e144ce0
R10: ffffc9001ab665b8 R11: ffffffff81ad1a70 R12: 0000000000000002
R13: ffffffff8e144ce0 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 is_bpf_text_address+0x47/0x2b0 kernel/bpf/core.c:748
 kernel_text_address+0xa5/0xe0 kernel/extable.c:125
 __kernel_text_address+0xd/0x40 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
 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]
 __do_kmalloc_node mm/slub.c:5894 [inline]
 __kmalloc_noprof+0x41d/0x800 mm/slub.c:5906
 kmalloc_noprof include/linux/slab.h:972 [inline]
 kzalloc_noprof include/linux/slab.h:1210 [inline]
 hash_netportnet6_resize+0xc8e/0x1f40 net/netfilter/ipset/ip_set_hash_gen.h:707
 call_ad+0x44e/0xb00 net/netfilter/ipset/ip_set_core.c:1757
 ip_set_ad+0x791/0x930 net/netfilter/ipset/ip_set_core.c:1841
 nfnetlink_rcv_msg+0xb4d/0x1130 net/netfilter/nfnetlink.c:302
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 nfnetlink_rcv+0x282/0x2590 net/netfilter/nfnetlink.c:669
 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_sendmsg+0x577/0x880 net/socket.c:2610
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2664
 __sys_sendmsg net/socket.c:2696 [inline]
 __do_sys_sendmsg net/socket.c:2701 [inline]
 __se_sys_sendmsg net/socket.c:2699 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2699
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f422c38f749
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:00007f422d26f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f422c5e5fa0 RCX: 00007f422c38f749
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000005
RBP: 00007f422c413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f422c5e6038 R14: 00007f422c5e5fa0 R15: 00007fff22571388
 </TASK>
task:syz.4.330       state:R  running task     stack:25304 pid:7190  tgid:7189  ppid:5837   task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x14db/0x5030 kernel/sched/core.c:6902
 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7179
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:753
 rcu_read_lock include/linux/rcupdate.h:851 [inline]
 __pte_offset_map+0x62/0x240 mm/pgtable-generic.c:288
 pte_offset_map_lock+0x46/0x210 mm/pgtable-generic.c:398
 do_anonymous_page mm/memory.c:5180 [inline]
 do_pte_missing+0xac1/0x3330 mm/memory.c:4414
 handle_pte_fault mm/memory.c:6255 [inline]
 __handle_mm_fault mm/memory.c:6393 [inline]
 handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6562
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f56804509e6
RSP: 002b:00007f56814184a0 EFLAGS: 00010206
RAX: 0000000000af6001 RBX: 00007f5681418540 RCX: 00000000000000be
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f56814185e0
RBP: 0000000000000102 R08: 00007f5676200000 R09: 0000000000af6000
R10: 0000000000000000 R11: 00007f5681418550 R12: 0000000000000001
R13: 00007f568062fc40 R14: 0000000000000000 R15: 00007f56814185e0
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g19653 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:28096 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x14db/0x5030 kernel/sched/core.c:6902
 __schedule_loop kernel/sched/core.c:6984 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6999
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x11b0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9b/0x2d0 kernel/rcu/tree.c:2297
 kthread+0x389/0x480 kernel/kthread.c:467
 ret_from_fork+0x510/0xa50 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:
CPU: 1 UID: 0 PID: 7178 Comm: syz.1.324 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xcd6/0x1260 kernel/smp.c:877
Code: 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 5f 96 0b 00 eb 38 f3 90 42 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 <74> 1e e8 43 96 0b 00 eb e4 44 89 e1 80 e1 07 80 c1 03 38 c1 7c e2
RSP: 0000:ffffc9001b5974a0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 1ffff110170c85c1 RCX: ffff88807cef0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9001b5975e0 R08: ffffffff8fa2d9f7 R09: 1ffffffff1f45b3e
R10: dffffc0000000000 R11: fffffbfff1f45b3f R12: ffff8880b8642e08
R13: dffffc0000000000 R14: ffff8880b873bd80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125cf9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5676cf6000 CR3: 000000000df3e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:57 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
 flush_tlb_mm_range+0x5db/0x1100 arch/x86/mm/tlb.c:1472
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:505 [inline]
 tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
 tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:529
 free_ldt_pgtables+0x17b/0x320 arch/x86/kernel/ldt.c:411
 arch_exit_mmap arch/x86/include/asm/mmu_context.h:234 [inline]
 exit_mmap+0x141/0xae0 mm/mmap.c:1263
 __mmput+0x118/0x430 kernel/fork.c:1173
 exit_mm+0x169/0x230 kernel/exit.c:581
 do_exit+0x627/0x22f0 kernel/exit.c:959
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f949eb8f749
Code: Unable to access opcode bytes at 0x7f949eb8f71f.
RSP: 002b:00007f949cdf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000007
RAX: 0000000000000002 RBX: 00007f949ede5fa0 RCX: 00007f949eb8f749
RDX: 0000000000008001 RSI: 0000000000000002 RDI: 0000200000000100
RBP: 00007f949ec13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f949ede6038 R14: 00007f949ede5fa0 R15: 00007ffea8087b68
 </TASK>