------------[ cut here ]------------
cpu_t != t
WARNING: arch/x86/kernel/cpu/mce/core.c:1770 at mce_timer_fn+0x289/0x2e0 arch/x86/kernel/cpu/mce/core.c:1770, CPU#0: syz.4.9404/29458
Modules linked in:
CPU: 0 UID: 0 PID: 29458 Comm: syz.4.9404 Tainted: G U L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:mce_timer_fn+0x289/0x2e0 arch/x86/kernel/cpu/mce/core.c:1770
Code: 58 00 4d 01 e4 4d 39 ec 4d 0f 47 e5 31 ff 4c 89 e6 e8 cb a4 58 00 4d 85 e4 0f 84 20 ff ff ff e9 f7 fe ff ff e8 18 aa 58 00 90 <0f> 0b 90 e9 cf fd ff ff 4c 89 f6 48 c7 c7 60 ee bf 8e e8 40 3a 85
RSP: 0018:ffffc90000007c20 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880b8423440 RCX: 0000000000000101
RDX: ffff88803776be80 RSI: ffffffff81b277f8 RDI: ffffffff8e6b7920
RBP: ffff8880b8523440 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 8000000000000101 R14: 1ffff92000000f8d R15: ffffffff81b27570
FS: 0000000000000000(0000) GS:ffff888123b70000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f16dc86c151 CR3: 0000000036650000 CR4: 00000000003526f0
Call Trace:
call_timer_fn+0x198/0x5f0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers+0x757/0xb00 kernel/time/timer.c:2374
__run_timer_base kernel/time/timer.c:2386 [inline]
__run_timer_base kernel/time/timer.c:2378 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2395
run_timer_softirq+0x10/0x50 kernel/time/timer.c:2403
handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0x194/0x210 kernel/softirq.c:767
irq_exit_rcu+0x9/0x30 kernel/softirq.c:784
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:139 [inline]
RIP: 0010:cpumask_check include/linux/cpumask.h:146 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:650 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1232 [inline]
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:23 [inline]
RIP: 0010:lock_acquire+0x39/0x370 kernel/locking/lockdep.c:5849
Code: c5 41 54 41 89 cc 55 48 89 fd 53 89 d3 48 83 ec 38 65 4c 8b 3d 70 89 a4 12 4c 89 7c 24 30 4d 89 cf 66 90 65 8b 05 8f 89 a4 12 <83> f8 07 0f 87 da 00 00 00 48 0f a3 05 9e aa 5e 0f 0f 82 b1 02 00
RSP: 0018:ffffc90005b073e8 EFLAGS: 00000296
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8edebe60
RBP: ffffffff8edebe60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
page_table_check_clear+0x12e/0x540 mm/page_table_check.c:77
__page_table_check_pte_clear+0x10f/0x120 mm/page_table_check.c:155
page_table_check_pte_clear include/linux/page_table_check.h:55 [inline]
ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1259 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:879 [inline]
zap_present_folio_ptes mm/memory.c:1717 [inline]
zap_present_ptes mm/memory.c:1799 [inline]
do_zap_pte_range mm/memory.c:1901 [inline]
zap_pte_range mm/memory.c:2003 [inline]
zap_pmd_range mm/memory.c:2089 [inline]
zap_pud_range mm/memory.c:2117 [inline]
zap_p4d_range mm/memory.c:2138 [inline]
__zap_vma_range+0x2c36/0x48c0 mm/memory.c:2178
unmap_vmas+0x299/0x5f0 mm/memory.c:2247
exit_mmap+0x1ef/0xa00 mm/mmap.c:1315
__mmput+0x12a/0x410 kernel/fork.c:1193
mmput+0x67/0x80 kernel/fork.c:1216
exit_mm kernel/exit.c:614 [inline]
do_exit+0x8b1/0x2ae0 kernel/exit.c:996
do_group_exit+0xd5/0x2a0 kernel/exit.c:1151
get_signal+0x1ec7/0x21e0 kernel/signal.c:3039
arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
do_syscall_64+0x603/0x770 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd03839e0d9
Code: Unable to access opcode bytes at 0x7fd03839e0af.
RSP: 002b:00007fd0392590e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd038625fa8 RCX: 00007fd03839e0d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd038625fa8
RBP: 00007fd038625fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd038626038 R14: 00007ffe24992410 R15: 00007ffe249924f8
----------------
Code disassembly (best guess):
0: c5 41 54 41 89 vandpd -0x77(%rcx),%xmm7,%xmm8
5: cc int3
6: 55 push %rbp
7: 48 89 fd mov %rdi,%rbp
a: 53 push %rbx
b: 89 d3 mov %edx,%ebx
d: 48 83 ec 38 sub $0x38,%rsp
11: 65 4c 8b 3d 70 89 a4 mov %gs:0x12a48970(%rip),%r15 # 0x12a48989
18: 12
19: 4c 89 7c 24 30 mov %r15,0x30(%rsp)
1e: 4d 89 cf mov %r9,%r15
21: 66 90 xchg %ax,%ax
23: 65 8b 05 8f 89 a4 12 mov %gs:0x12a4898f(%rip),%eax # 0x12a489b9
* 2a: 83 f8 07 cmp $0x7,%eax <-- trapping instruction
2d: 0f 87 da 00 00 00 ja 0x10d
33: 48 0f a3 05 9e aa 5e bt %rax,0xf5eaa9e(%rip) # 0xf5eaad9
3a: 0f
3b: 0f .byte 0xf
3c: 82 (bad)
3d: b1 02 mov $0x2,%cl