syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.6.17895:7917]
Modules linked in:
irq event stamp: 13322737
hardirqs last  enabled at (13322736): [<ffffffff8bad2f2e>] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242
hardirqs last disabled at (13322737): [<ffffffff8bad193e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (12880620): [<ffffffff8187fdef>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (12880620): [<ffffffff8187fdef>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (12880620): [<ffffffff8187fdef>] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
softirqs last disabled at (12880623): [<ffffffff8187fdef>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (12880623): [<ffffffff8187fdef>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (12880623): [<ffffffff8187fdef>] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
CPU: 1 UID: 0 PID: 7917 Comm: syz.6.17895 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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:ffffc90000a08398 EFLAGS: 00000a06
RAX: 0000000000000006 RBX: ffffffff8bce0089 RCX: 000000008bce0000
RDX: ffffffff81767a45 RSI: ffffffff8e7602e0 RDI: ffffffff8bce0080
RBP: ffffc90000a084c0 R08: ffffc9000c95f9c8 R09: 0000000000000000
R10: ffffc90000a08658 R11: fffff520001410cd R12: dffffc0000000000
R13: ffffffff81767a45 R14: dffffc0000000000 R15: 0000000000000008
FS:  00007fd4812346c0(0000) GS:ffff888125567000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31d1cff8 CR3: 000000008fb34000 CR4: 00000000003526f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000006 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __fortify_strlen include/linux/fortify-string.h:266 [inline]
 trace_event_get_offsets_lock include/trace/events/lock.h:50 [inline]
 do_perf_trace_lock include/trace/events/lock.h:50 [inline]
 perf_trace_lock+0xd5/0x410 include/trace/events/lock.h:50
 __do_trace_lock_release include/trace/events/lock.h:69 [inline]
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x392/0x3d0 kernel/locking/lockdep.c:5879
 rcu_lock_release include/linux/rcupdate.h:322 [inline]
 rcu_read_unlock include/linux/rcupdate.h:881 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1193 [inline]
 unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4501 [inline]
 slab_alloc_node mm/slub.c:4830 [inline]
 kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4882
 kmalloc_reserve net/core/skbuff.c:613 [inline]
 __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713
 __netdev_alloc_skb+0xc1/0x810 net/core/skbuff.c:775
 netdev_alloc_skb include/linux/skbuff.h:3485 [inline]
 dev_alloc_skb include/linux/skbuff.h:3498 [inline]
 hsr_init_skb+0xef/0x6e0 net/hsr/hsr_device.c:267
 send_hsr_supervision_frame+0x143/0xcb0 net/hsr/hsr_device.c:316
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:754
Code: c3 58 c9 1c 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d 89 ea 70 11 74 11 83 e0 04 c1 e8 02 5b <41> 5e 41 5f c3 cc cc cc cc cc e8 71 08 89 ff eb e8 48 c7 c7 c0 67
RSP: 0018:ffffc9000c95f750 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000002
RDX: 00000000d2c679f2 RSI: ffffffff8c27a860 RDI: ffffffff8c27a820
RBP: 0000000000000006 R08: ffffffff823946e7 R09: ffffffff8e7602e0
R10: ffffc9000c95f408 R11: fffff5200192be83 R12: ffff888034262f00
R13: dffffc0000000000 R14: ffffffff8e1aa798 R15: dffffc0000000000
 rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
 rcu_read_lock_held+0x15/0x50 kernel/rcu/update.c:349
 obj_cgroup_memcg+0x32/0xa0 include/linux/memcontrol.h:381
 mod_objcg_mlstate+0x76/0x1b0 mm/memcontrol.c:2612
 refill_obj_stock+0x315/0x9b0 mm/memcontrol.c:3109
 obj_cgroup_charge_account+0x116/0x650 mm/memcontrol.c:3162
 __memcg_slab_post_alloc_hook+0x5f8/0xa80 mm/memcontrol.c:3249
 memcg_slab_post_alloc_hook mm/slub.c:2459 [inline]
 slab_post_alloc_hook mm/slub.c:4512 [inline]
 slab_alloc_node mm/slub.c:4830 [inline]
 kmem_cache_alloc_node_noprof+0x40e/0x690 mm/slub.c:4882
 alloc_task_struct_node kernel/fork.c:185 [inline]
 dup_task_struct+0x57/0x9a0 kernel/fork.c:916
 copy_process+0x508/0x3cf0 kernel/fork.c:2050
 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: 0033:0x7fd48039c629
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:00007fd481233fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fd480615fa0 RCX: 00007fd48039c629
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd480432b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd480616038 R14: 00007fd480615fa0 R15: 00007fff0605e9b8
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9117 Comm: kworker/u9:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: hci4 hci_cmd_timeout
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x55/0xb0 kernel/rcu/tree.c:752
Code: a7 1a 8e 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 4c 0b 85 00 48 c7 c3 58 c9 1c 93 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d 89 ea 70 11 74 11 83 e0
RSP: 0018:ffffc90000007ba8 EFLAGS: 00000806
RAX: 1ffff110170c672b RBX: ffff8880b8633958 RCX: 0000000080010004
RDX: 00000000ad839568 RSI: ffffffff8c27a860 RDI: ffffffff8c27a820
RBP: 0000000000000008 R08: ffffffff81981d4e R09: ffffffff8e7602e0
R10: dffffc0000000000 R11: ffffffff81981a00 R12: ffffffff8e1aa790
R13: 1ffffffff1c354f2 R14: ffffffff8e1aa790 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125467000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f82faed168 CR3: 0000000079a5a000 CR4: 00000000003526f0
DR0: 0000200000000300 DR1: fffffffffffffffd DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
 rcu_read_lock_any_held+0x15/0x90 kernel/rcu/update.c:384
 select_task_rq_fair+0x435/0x4320 kernel/sched/fair.c:8542
 select_task_rq kernel/sched/core.c:3521 [inline]
 try_to_wake_up+0x4db/0x1390 kernel/sched/core.c:4230
 hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:2021
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 72 27 21 00 fb eb 44 e8 6a 27 21 00 e8 75 be 08 0a 4d 85 f6 74 94 e8 5b 27 21 00 fb 48 c7 c7 20 27 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 16
RSP: 0018:ffffc9000e167800 EFLAGS: 00000293
RAX: ffffffff81a46425 RBX: ffffffff81a4629f RCX: ffff88802690dac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e752720
RBP: ffffc9000e1678b0 R08: ffffffff90117db7 R09: 1ffffffff2022fb6
R10: dffffc0000000000 R11: fffffbfff2022fb7 R12: 0000000000000000
R13: 000000000000002a R14: 0000000000000200 R15: 1ffff92001c2cf04
 _printk+0xdd/0x130 kernel/printk/printk.c:2504
 bt_err+0x121/0x180 net/bluetooth/lib.c:296
 hci_cmd_timeout+0xd8/0x1e0 net/bluetooth/hci_core.c:1470
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>