watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.3:58075] Modules linked in: irq event stamp: 11787901 hardirqs last enabled at (11787900): [] irqentry_exit+0x1bf/0x760 hardirqs last disabled at (11787901): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (11765934): [] __irq_exit_rcu+0x137/0x1c0 softirqs last disabled at (11765937): [] __irq_exit_rcu+0x137/0x1c0 CPU: 0 UID: 0 PID: 58075 Comm: syz-executor.3 Not tainted 7.1.0-rc2-next-20260508 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__rcu_read_unlock+0xc6/0x5c0 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e d1 01 00 00 8b 85 80 04 00 00 85 c0 75 57 <65> 48 8b 1d ca 2c 7a 06 48 8d bb 7c 04 00 00 48 b8 00 00 00 00 00 RSP: 0018:ffff88806cc08980 EFLAGS: 00000202 RAX: 0000000000b3de76 RBX: ffff88806cc38a00 RCX: 0000000000000008 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff815dc4d8 RBP: ffffffff86032e00 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8689c957 R11: 0000000000022149 R12: ffff888058f30000 R13: ffff88806cc08a00 R14: 0000000000000200 R15: ffff88806cc08a20 FS: 00007fd1fc76a700(0000) GS:ffff8880e4ea1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd7bb8c4018 CR3: 00000000590c0000 CR4: 0000000000350ef0 Call Trace: unwind_next_frame+0x3bc/0x2790 arch_stack_walk+0x86/0xf0 stack_trace_save+0x8e/0xc0 kasan_save_stack+0x24/0x50 kasan_record_aux_stack+0x89/0xa0 __call_rcu_common.constprop.0+0x70/0x9d0 __rcu_free_sheaf_prepare+0x166/0x2c0 rcu_free_sheaf+0x1b/0xf0 rcu_core+0x5d7/0x1470 handle_softirqs+0x1b1/0x8e0 __irq_exit_rcu+0x137/0x1c0 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:preempt_schedule_irq+0x49/0x90 Code: 00 fc ff df 55 65 48 8b 2d fc ed f2 02 53 48 89 eb 48 c1 eb 03 48 01 c3 65 ff 05 02 ee f2 02 e8 2d 8d 9a fc fb bf 01 00 00 00 52 ac ff ff 9c 58 fa f6 c4 02 75 1b 65 ff 0d e3 ed f2 02 80 3b RSP: 0018:ffff88801b45f378 EFLAGS: 00000202 RAX: 000000000060442f RBX: ffffed100b1e6000 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff888058f30000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8689c957 R11: ffff88806cc37be0 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit+0x205/0x760 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:_raw_spin_unlock_irqrestore+0x34/0x50 Code: c7 18 53 48 89 f3 48 8b 74 24 10 e8 d6 e1 6c fc 48 89 ef e8 9e 32 6d fc 80 e7 02 74 06 e8 24 d7 98 fc fb 65 ff 0d ec 37 f1 02 <74> 07 5b 5d e9 f3 23 00 00 e8 fe e0 39 fc 5b 5d e9 e7 23 00 00 0f RSP: 0018:ffff88801b45f498 EFLAGS: 00000286 RAX: 0000000000603bc9 RBX: 0000000000000256 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84e6b83c RBP: ffff888009c5c900 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8689c957 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88801b45f4e8 R14: ffff88800b285128 R15: ffff88800b285128 qlist_free_all+0x50/0x130 kasan_quarantine_reduce+0x19f/0x240 __kasan_slab_alloc+0x49/0x70 kmem_cache_alloc_noprof+0x1ee/0x650 __pmd_alloc+0x98/0xa10 copy_page_range+0x31ba/0x5500 dup_mmap+0xccb/0x1f20 copy_process+0x3cf8/0x77c0 kernel_clone+0x1fd/0x870 __do_sys_fork+0x94/0xd0 do_syscall_64+0x113/0x6a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd1ff1f4b19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd1fc76a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000039 RAX: ffffffffffffffda RBX: 00007fd1ff307f60 RCX: 00007fd1ff1f4b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fd1ff24ef6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe2f267bf R14: 00007fd1fc76a300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 7.1.0-rc2-next-20260508 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:pv_native_safe_halt+0x1e/0x30 Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 eb 0c 0f 1f 44 00 00 0f 00 2d c9 cf 21 00 0f 1f 44 00 00 fb f4 fd eb 02 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 RSP: 0018:ffff88800a767e58 EFLAGS: 00000206 RAX: 000000000097da69 RBX: 0000000000000001 RCX: ffffffff84e40747 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff814dde9b RBP: 0000000000000001 R08: 0000000000000001 R09: ffffed100d9a641a R10: ffff88806cd320d3 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff8689c950 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880e4fa1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f90deadc010 CR3: 000000000e77b000 CR4: 0000000000350ef0 Call Trace: default_idle+0xe/0x20 default_idle_call+0x6c/0xb0 do_idle+0x42b/0x550 cpu_startup_entry+0x4f/0x60 start_secondary+0x1bd/0x210 common_startup_64+0x13e/0x158 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff (bad) 8: df 48 89 fisttps -0x77(%rax) b: fa cli c: 48 c1 ea 03 shr $0x3,%rdx 10: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 14: 84 c0 test %al,%al 16: 74 08 je 0x20 18: 3c 03 cmp $0x3,%al 1a: 0f 8e d1 01 00 00 jle 0x1f1 20: 8b 85 80 04 00 00 mov 0x480(%rbp),%eax 26: 85 c0 test %eax,%eax 28: 75 57 jne 0x81 * 2a: 65 48 8b 1d ca 2c 7a mov %gs:0x67a2cca(%rip),%rbx # 0x67a2cfc <-- trapping instruction 31: 06 32: 48 8d bb 7c 04 00 00 lea 0x47c(%rbx),%rdi 39: 48 rex.W 3a: b8 00 00 00 00 mov $0x0,%eax