watchdog: BUG: soft lockup - CPU#0 stuck for 131s! [syz.5.4330:26243] Modules linked in: irq event stamp: 16171533 hardirqs last enabled at (16171532): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (16171533): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (16153770): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (16153770): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (16153770): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (16153773): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (16153773): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (16153773): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 26243 Comm: syz.5.4330 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 RIP: 0010:strlen+0x2e/0x70 lib/string.c:420 Code: 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 <84> c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 75 de eb 19 89 RSP: 0018:ffffc90000007978 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffffffff8d065520 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888095058f70 RDI: ffffffff8d065520 RBP: ffffc90000007a98 R08: 0000000000000000 R09: 0000000000000001 R10: dffffc0000000000 R11: ffffed100c73ae21 R12: ffffffff8e62a340 R13: ffff888095058f70 R14: dffffc0000000000 R15: ffffffffffffffff FS: 00007f2bafb016c0(0000) GS:ffff888125463000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558bc254e8 CR3: 0000000088978000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0100000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __fortify_strlen include/linux/fortify-string.h:266 [inline] trace_event_get_offsets_lock_acquire include/trace/events/lock.h:24 [inline] do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0xde/0x440 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2a4/0x2e0 kernel/locking/lockdep.c:5831 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:347 [inline] send_hsr_supervision_frame+0x380/0xcb0 net/hsr/hsr_device.c:330 hsr_announce+0x1db/0x370 net/hsr/hsr_device.c:421 call_timer_fn+0x192/0x640 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:ptep_get include/linux/pgtable.h:461 [inline] RIP: 0010:copy_pte_range mm/memory.c:1287 [inline] RIP: 0010:copy_pmd_range+0x873/0x8050 mm/memory.c:1405 Code: d3 0c af ff 48 c7 84 24 b8 00 00 00 00 00 00 00 4c 89 eb 49 89 dd 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 <74> 08 48 89 df e8 e3 62 19 00 48 89 5c 24 60 48 8b 1b 48 89 5c 24 RSP: 0018:ffffc9000ccdf320 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8880a79e4010 RCX: 0000000000080000 RDX: ffffc9001545c000 RSI: 0000000000006573 RDI: 0000000000006574 RBP: ffffc9000ccdf5b0 R08: ffff88801ed5debb R09: 1ffff11003dabbd7 R10: dffffc0000000000 R11: ffffed1003dabbd8 R12: 0000000000000001 R13: 1ffff11014f3c802 R14: ffff8880628de010 R15: 0000200000002000 copy_pud_range mm/memory.c:1442 [inline] copy_p4d_range mm/memory.c:1466 [inline] copy_page_range+0xbe8/0x11f0 mm/memory.c:1552 dup_mmap+0xf40/0x1d90 mm/mmap.c:1841 dup_mm kernel/fork.c:1530 [inline] copy_mm+0x13b/0x4b0 kernel/fork.c:1582 copy_process+0x18b6/0x3cf0 kernel/fork.c:2223 kernel_clone+0x248/0x8e0 kernel/fork.c:2654 __do_sys_clone kernel/fork.c:2795 [inline] __se_sys_clone kernel/fork.c:2779 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2779 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2baeb9c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2bafb00fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f2baee15fa0 RCX: 00007f2baeb9c799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f2baec32c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2baee16038 R14: 00007f2baee15fa0 R15: 00007fff9cb301d8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:313 Code: 11 10 48 89 74 11 18 48 89 44 11 20 e9 c9 36 eb 09 cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 15 08 2e 56 11 65 8b 0d 29 2e 56 RSP: 0000:ffffc90000a67318 EFLAGS: 00000293 RAX: ffffffff8ba9fbbb RBX: 00000000ffffffff RCX: ffff88801dea3d00 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff RBP: ffffc90000a67440 R08: ffffc90000a673b7 R09: 0000000000000000 R10: ffffc90000a673a0 R11: fffff5200014ce77 R12: 00000000fffffffe R13: 0000000000000004 R14: ffffc90000a67722 R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff888125563000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd302c6070 CR3: 0000000060094000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: number+0xb83/0xf80 lib/vsprintf.c:571 vsnprintf+0x8e5/0xee0 lib/vsprintf.c:2912 sprintf+0xe7/0x140 lib/vsprintf.c:3111 print_time kernel/printk/printk.c:1359 [inline] info_print_prefix+0x16b/0x360 kernel/printk/printk.c:1385 record_print_text+0x176/0x450 kernel/printk/printk.c:1434 printk_get_next_message+0x29c/0x880 kernel/printk/printk.c:3072 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x501/0xb20 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479 _printk+0xdd/0x130 kernel/printk/printk.c:2504 check_hung_task kernel/hung_task.c:255 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:331 [inline] watchdog+0xb45/0x1030 kernel/hung_task.c:515 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245