BUG: soft lockup in rcu_core_si

Status: auto-obsoleted due to no activity on 2026/01/23 00:19
Reported-by: syzbot+effb7b76c4dd68e7003f@syzkaller.appspotmail.com
First crash: 298d, last: 298d
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 BUG: soft lockup in rcu_core_si 1 syz, C done 46 703d 858d 0/2 auto-obsoleted due to no activity on 2024/11/24 09:57

Sample crash report:
RBP: 00007fe2a9169f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe2a933e038 R14: 00007fe2a933dfa0 R15: 00007ffc62c90638
watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.2.2015:7446]
Modules linked in:
CPU: 1 PID: 7446 Comm: syz.2.2015 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_core+0x106/0xd60 kernel/rcu/tree.c:2705
Code: 00 88 44 24 06 e8 fa aa 20 03 41 89 c6 c1 e8 06 48 8d 3c c5 68 50 a3 86 be 08 00 00 00 e8 72 52 4b 00 4c 0f a3 35 92 0b 51 05 <0f> 83 40 05 00 00 4c 89 7c 24 40 4c 8b 3d e0 d2 50 05 4c 89 6c 24
RSP: 0018:ffffc90000170e20 EFLAGS: 00000257
RAX: 0000000000000001 RBX: ffff8881f71572c0 RCX: ffffffff815244ce
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff86a35068
RBP: ffffc90000170f48 R08: dffffc0000000000 R09: fffffbfff0d46a0e
R10: fffffbfff0d46a0e R11: 1ffffffff0d46a0d R12: dffffc0000000000
R13: ffff8881f7157391 R14: 0000000000000001 R15: 1ffff9200002e1d0
FS:  00007fe2a7b4f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555559f4c4a8 CR3: 0000000111bf3000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x255/0x563 kernel/softirq.c:309
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:405 [inline]
 __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447
 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:csd_lock_wait kernel/smp.c:229 [inline]
RIP: 0010:smp_call_function_single+0x1f5/0x470 kernel/smp.c:517
Code: 48 44 89 f6 83 e6 01 31 ff e8 c7 6f 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 02 6c 0a 00 e9 a9 00 00 00 f3 90 <f7> 44 24 48 01 00 00 00 0f 84 94 00 00 00 e8 e8 6b 0a 00 eb e9 e8
RSP: 0018:ffffc900015b7340 EFLAGS: 00000246
RAX: ffffffff815939b8 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90001cdd000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900015b7430 R08: dffffc0000000000 R09: ffffed103ee0aec9
R10: ffffed103ee0aec9 R11: 1ffff1103ee0aec8 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff920002b6e6c
 smp_call_function_many_cond+0x8f2/0x9e0 kernel/smp.c:653
 smp_call_function_many kernel/smp.c:716 [inline]
 smp_call_function kernel/smp.c:738 [inline]
 on_each_cpu+0xab/0x170 kernel/smp.c:837
 flush_tlb_all+0x17/0x20 arch/x86/mm/tlb.c:932
 cpa_flush arch/x86/mm/pat/set_memory.c:365 [inline]
 change_page_attr_set_clr+0x5d7/0xc10 arch/x86/mm/pat/set_memory.c:1774
 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1789 [inline]
 set_memory_ro+0x89/0xd0 arch/x86/mm/pat/set_memory.c:1935
 bpf_jit_binary_lock_ro include/linux/filter.h:846 [inline]
 bpf_int_jit_compile+0x860b/0x8ae0 arch/x86/net/bpf_jit_comp.c:2134
 bpf_prog_select_runtime+0x742/0x9e0 kernel/bpf/core.c:1876
 bpf_prog_load+0xf85/0x1420 kernel/bpf/syscall.c:2238
 __do_sys_bpf kernel/bpf/syscall.c:4435 [inline]
 __se_sys_bpf+0x442/0x680 kernel/bpf/syscall.c:4391
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe2a90e6fc9
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:00007fe2a7b4f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fe2a933dfa0 RCX: 00007fe2a90e6fc9
RDX: 0000000000000080 RSI: 0000200000002ac0 RDI: 0000000000000005
RBP: 00007fe2a9169f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe2a933e038 R14: 00007fe2a933dfa0 R15: 00007ffc62c90638
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7459 Comm: syz.4.2019 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:66 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:112 [inline]
RIP: 0010:kvm_wait+0xb2/0x120 arch/x86/kernel/kvm.c:921
Code: c1 e8 03 42 0f b6 04 30 84 c0 75 6d 0f b6 07 40 38 f0 75 26 41 f7 c4 00 02 00 00 75 0f 0f 1f 44 00 00 0f 00 2d af 98 98 03 f4 <eb> 0e 0f 1f 44 00 00 0f 00 2d a0 98 98 03 fb f4 4c 89 64 24 18 ff
RSP: 0018:ffffc90000b975a0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff888127d44d20 RCX: ffffffff814b25ba
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff888127d44d20
RBP: ffffc90000b97650 R08: dffffc0000000000 R09: ffffed1024fa89a5
R10: ffffed1024fa89a5 R11: 1ffff11024fa89a4 R12: 0000000000000046
R13: 1ffff11024fa89a4 R14: dffffc0000000000 R15: 1ffff92000172eb8
FS:  00007ff2d8cf06c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000d000 CR3: 000000010ff77000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x714/0xb70 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock_flags include/linux/spinlock.h:195 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:159
 trie_delete_elem+0x95/0x710 kernel/bpf/lpm_trie.c:465
 bpf_prog_8c8ab8634bca3061+0x3a/0x6c8
 bpf_dispatcher_nop_func include/linux/bpf.h:669 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2061 [inline]
 bpf_trace_run4+0xd5/0x240 kernel/trace/bpf_trace.c:2100
 __bpf_trace_mm_page_alloc+0xc0/0xf0 include/trace/events/kmem.h:193
 trace_mm_page_alloc include/trace/events/kmem.h:193 [inline]
 __alloc_pages_nodemask+0x5b4/0x5f0 mm/page_alloc.c:5398
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 kmalloc_order+0x4c/0x160 mm/slab_common.c:843
 kmalloc_order_trace+0x16/0x80 mm/slab_common.c:859
 kmalloc_large include/linux/slab.h:481 [inline]
 __kmalloc+0x1ee/0x330 mm/slub.c:4027
 __kmalloc_node include/linux/slab.h:418 [inline]
 kmalloc_node include/linux/slab.h:575 [inline]
 lpm_trie_node_alloc kernel/bpf/lpm_trie.c:288 [inline]
 trie_update_elem+0x19e/0xc70 kernel/bpf/lpm_trie.c:330
 bpf_map_update_value+0x324/0x430 kernel/bpf/syscall.c:219
 map_update_elem+0x4a1/0x5e0 kernel/bpf/syscall.c:1139
 __do_sys_bpf kernel/bpf/syscall.c:4423 [inline]
 __se_sys_bpf+0x398/0x680 kernel/bpf/syscall.c:4391
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ff2da287fc9
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:00007ff2d8cf0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ff2da4defa0 RCX: 00007ff2da287fc9
RDX: 0000000000000020 RSI: 0000200000000a00 RDI: 0000000000000002
RBP: 00007ff2da30af91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff2da4df038 R14: 00007ff2da4defa0 R15: 00007fff7c8a06c8

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/25 00:16 android13-5.10-lts 2ece552169c2 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10-perf BUG: soft lockup in rcu_core_si
* Struck through repros no longer work on HEAD.