watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.8.148:6648] Modules linked in: irq event stamp: 11625901 hardirqs last enabled at (11625900): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (11625901): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (11608622): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (11608622): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (11608622): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (11608625): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (11608625): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (11608625): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6648 Comm: syz.8.148 Not tainted 6.15.0-rc4-syzkaller-g38d976c32d85 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:arch_stack_walk+0x123/0x150 arch/x86/kernel/stacktrace.c:24 Code: 00 09 00 48 85 c0 74 24 48 89 df 48 89 c6 4d 89 f3 41 ff d3 0f 1f 00 84 c0 74 11 4c 89 ff e8 74 01 09 00 83 bd 78 ff ff ff 00 <75> cf 65 48 8b 05 33 a8 0c 11 48 3b 45 d8 75 12 48 83 c4 68 5b 41 RSP: 0018:ffffc900000074a8 EFLAGS: 00000202 RAX: 000000009017f901 RBX: ffffc90000007560 RCX: 433f16c90f47f800 RDX: 0000000000000005 RSI: ffffffff8d93512e RDI: ffff888075043c00 RBP: ffffc90000007530 R08: ffffc9000439fb30 R09: 0000000000000000 R10: ffffc900000074f8 R11: fffff52000000ea1 R12: ffff888075043c00 R13: ffff88803265cc80 R14: ffffffff81acaa70 R15: ffffc900000074a8 FS: 00007f7e7b2b86c0(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000033c000 CR3: 0000000054734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4262 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:658 __netdev_alloc_skb+0x108/0x970 net/core/skbuff.c:732 netdev_alloc_skb include/linux/skbuff.h:3413 [inline] dev_alloc_skb include/linux/skbuff.h:3426 [inline] hsr_init_skb+0xef/0x6e0 net/hsr/hsr_device.c:264 send_hsr_supervision_frame+0x133/0xb30 net/hsr/hsr_device.c:313 hsr_announce+0x1d2/0x360 net/hsr/hsr_device.c:415 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7090 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 eb c3 39 f6 e8 86 43 70 f6 fb bf 01 00 00 00 4b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9000439f680 EFLAGS: 00000282 RAX: 433f16c90f47f800 RBX: 0000000000000000 RCX: 433f16c90f47f800 RDX: 0000000000000006 RSI: ffffffff8d749fcc RDI: 0000000000000001 RBP: ffffc9000439f720 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000873ed0 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:cap_capable+0x45/0x460 security/commoncap.c:127 Code: bd 00 00 00 00 00 fc ff df e8 b7 45 56 fd 4d 8d a7 90 00 00 00 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 8b 36 b8 fd <4d> 8b 24 24 4d 39 e6 0f 85 fe 00 00 00 e8 89 45 56 fd 4d 8d 6f 40 RSP: 0018:ffffc9000439f7e0 EFLAGS: 00010246 RAX: 1ffff11004c962d2 RBX: 0000000000000015 RCX: 0000000000080000 RDX: ffffc9001b870000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: dffffc0000000000 R08: ffffffff999ae083 R09: 1ffffffff3335c10 R10: dffffc0000000000 R11: ffffffff8469d090 R12: ffff8880264b1690 R13: ffff888075044158 R14: ffffffff8dddebc0 R15: ffff8880264b1600 security_vm_enough_memory_mm+0x69/0x4f0 security/security.c:1230 shmem_acct_blocks mm/shmem.c:212 [inline] shmem_inode_acct_blocks+0xd9/0x470 mm/shmem.c:228 shmem_alloc_and_add_folio+0x8bc/0xf60 mm/shmem.c:1923 shmem_get_folio_gfp+0x597/0x15f0 mm/shmem.c:2533 shmem_get_folio mm/shmem.c:2639 [inline] shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3289 generic_perform_write+0x2c4/0x910 mm/filemap.c:4103 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3464 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x548/0xa90 fs/read_write.c:684 ksys_write+0x145/0x250 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7e7a38e969 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:00007f7e7b2b8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7e7a5b5fa0 RCX: 00007f7e7a38e969 RDX: 000000011ffffce1 RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007f7e7a410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7e7a5b5fa0 R15: 00007fff290c6f28 Sending NMI from CPU 0 to CPUs 1: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6663 Comm: kworker/u8:15 Not tainted 6.15.0-rc4-syzkaller-g38d976c32d85 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5596 [inline] RIP: 0010:lock_is_held_type+0xb6/0x190 kernel/locking/lockdep.c:5938 Code: eb 48 81 c3 f0 0a 00 00 45 31 ff 49 83 ff 31 73 24 48 89 df 4c 89 f6 e8 78 02 00 00 85 c0 75 2a 49 ff c7 49 63 85 e8 0a 00 00 <48> 83 c3 28 49 39 c7 7c d8 eb 11 48 c7 c7 d0 cd e0 8d 4c 89 fe e8 RSP: 0000:ffffc90000a08418 EFLAGS: 00000002 RAX: 000000000000000a RBX: ffff88801cba46f0 RCX: 1f99dd98dc6ab400 RDX: ffff88801cba3c00 RSI: ffffffff99b4bb98 RDI: ffff88801cba46f0 RBP: 00000000ffffffff R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000141068 R12: 0000000000000046 R13: ffff88801cba3c00 R14: ffffffff99b4bb98 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd3de00036 CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_is_held include/linux/lockdep.h:249 [inline] __uart_port_using_nbcon include/linux/serial_core.h:638 [inline] __uart_port_nbcon_acquire include/linux/serial_core.h:672 [inline] uart_port_lock_irqsave include/linux/serial_core.h:716 [inline] serial8250_console_write+0x1c3/0x1ba0 drivers/tty/serial/8250/8250_port.c:3415 console_emit_next_record kernel/printk/printk.c:3138 [inline] console_flush_all+0x725/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 print_other_cpu_stall+0x189/0x1370 kernel/rcu/tree_stall.h:598 check_cpu_stall kernel/rcu/tree_stall.h:795 [inline] rcu_pending kernel/rcu/tree.c:3630 [inline] rcu_sched_clock_irq+0x9cb/0x1080 kernel/rcu/tree.c:2669 update_process_times+0x23c/0x2f0 kernel/time/timer.c:2515 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x39a/0x520 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x4dd/0xc60 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885 Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b RSP: 0000:ffffc900038ef700 EFLAGS: 00000293 RAX: ffffffff81b45620 RBX: ffff8880b893ad40 RCX: ffff88801cba3c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900038ef860 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: 1ffff11017108245 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8841228 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2455 [inline] text_poke_bp_batch+0x319/0x940 arch/x86/kernel/alternative.c:2665 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245