------------[ cut here ]------------
WARNING: CPU: 1 PID: 8817 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Modules linked in:
CPU: 1 UID: 0 PID: 8817 Comm: syz.8.724 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1050
Code: ff ff 48 c7 c7 80 c4 7d 99 be 04 00 00 00 e8 c3 23 7f 00 4c 89 f7 b8 01 00 00 00 87 05 25 da d6 17 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 40 29 f4 8d 74 47 48 c7 c0 90 10 7d 8f 48 c1 e8
RSP: 0018:ffffc90000a08bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a6ea4d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8df42940
RBP: ffffc90000a08e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff32fb890 R12: 0000000000002904
R13: 1ffff110171275f2 R14: ffffffff8df42940 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c282039 CR3: 000000000dd38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_core+0x5fa/0x1770 kernel/rcu/tree.c:2856
handle_softirqs+0x286/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd38/0x12d0 kernel/smp.c:877
Code: 89 ee 83 e6 01 31 ff e8 b6 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 6f 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 45 6f 0b 00 eb e4 44
RSP: 0018:ffffc90003d6f340 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff11017108431 RCX: ffff888067901e40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003d6f4c0 R08: ffffffff8f7ce077 R09: 1ffffffff1ef9c0e
R10: dffffc0000000000 R11: fffffbfff1ef9c0f R12: ffff8880b8842188
R13: dffffc0000000000 R14: ffff8880b893b1c0 R15: 0000000000000000
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1381 [inline]
flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1471
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline]
tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497
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+0x174/0xb40 mm/mmap.c:1266
__mmput+0x118/0x430 kernel/fork.c:1133
exit_mm+0x1da/0x2c0 kernel/exit.c:582
do_exit+0x648/0x2300 kernel/exit.c:954
do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efdd458f6c9
Code: Unable to access opcode bytes at 0x7efdd458f69f.
RSP: 002b:00007efdd54a4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000000044 RBX: 00007efdd47e6180 RCX: 00007efdd458f6c9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007efdd4611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efdd47e6218 R14: 00007efdd47e6180 R15: 00007ffc15720158
----------------
Code disassembly (best guess):
0: 89 ee mov %ebp,%esi
2: 83 e6 01 and $0x1,%esi
5: 31 ff xor %edi,%edi
7: e8 b6 73 0b 00 call 0xb73c2
c: 41 83 e5 01 and $0x1,%r13d
10: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
17: fc ff df
1a: 75 07 jne 0x23
1c: e8 61 6f 0b 00 call 0xb6f82
21: eb 38 jmp 0x5b
23: f3 90 pause
25: 42 0f b6 04 2b movzbl (%rbx,%r13,1),%eax
* 2a: 84 c0 test %al,%al <-- trapping instruction
2c: 75 11 jne 0x3f
2e: 41 f7 04 24 01 00 00 testl $0x1,(%r12)
35: 00
36: 74 1e je 0x56
38: e8 45 6f 0b 00 call 0xb6f82
3d: eb e4 jmp 0x23
3f: 44 rex.R