syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.3.101:6399]
Modules linked in:
irq event stamp: 11218229
hardirqs last  enabled at (11218228): [<ffffffff8b7a4234>] irqentry_exit+0x74/0x90 kernel/entry/common.c:200
hardirqs last disabled at (11218229): [<ffffffff8b7a2e6e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050
softirqs last  enabled at (10533860): [<ffffffff8185050a>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last  enabled at (10533860): [<ffffffff8185050a>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last  enabled at (10533860): [<ffffffff8185050a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
softirqs last disabled at (10533863): [<ffffffff8185050a>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last disabled at (10533863): [<ffffffff8185050a>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last disabled at (10533863): [<ffffffff8185050a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
CPU: 1 UID: 0 PID: 6399 Comm: syz.3.101 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:842 [inline]
RIP: 0010:is_bpf_text_address+0x4b/0x2b0 kernel/bpf/core.c:776
Code: 05 00 00 00 00 48 c7 c7 e0 a0 13 8e 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 48 89 44 24 08 50 e8 e9 b7 ce ff 48 83 c4 08 <e8> 90 89 ab 09 89 c5 31 ff 89 c6 e8 e5 0d f1 ff 85 ed 74 10 e8 8c
RSP: 0018:ffffc90000a08430 EFLAGS: 00000296
RAX: 1f6a8aadde46ad00 RBX: 00007ff38e38eba9 RCX: 1f6a8aadde46ad00
RDX: 0000000000000000 RSI: ffffffff8dba9339 RDI: ffffffff8be33d80
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81ceb526
R10: dffffc0000000000 R11: fffff91ffffae835 R12: ffff88802d881e00
R13: 0000000000000000 R14: 00007ff38e38eba9 R15: 1ffff920001410a2
FS:  00007ff38f1d76c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f387ab9ef98 CR3: 0000000028e20000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 kernel_text_address+0xa5/0xe0 kernel/extable.c:125
 __kernel_text_address+0xd/0x40 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
 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
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:243 [inline]
 __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2422 [inline]
 slab_free mm/slub.c:4695 [inline]
 kmem_cache_free+0x18f/0x400 mm/slub.c:4797
 kfree_skb_reason include/linux/skbuff.h:1275 [inline]
 kfree_skb include/linux/skbuff.h:1284 [inline]
 hsr_forward_skb+0x1ac6/0x2860 net/hsr/hsr_forward.c:-1
 send_hsr_supervision_frame+0x612/0xb30 net/hsr/hsr_device.c:361
 hsr_announce+0x1d5/0x360 net/hsr/hsr_device.c:418
 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 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_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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:ffffc9000ea96dd8 EFLAGS: 00000a02
RAX: 0000000000000006 RBX: ffffffff8b8bd56a RCX: 000000008b8bd501
RDX: ffffffff81cb1657 RSI: ffffffff8e13a0e0 RDI: ffffffff8b8bd560
RBP: ffffc9000ea96ee8 R08: ffffc9000ea96fef R09: 0000000000000000
R10: ffffc9000ea96fe0 R11: ffffffffa0203754 R12: 1ffff92001d52dc8
R13: ffffffff81cb1657 R14: dffffc0000000000 R15: 0000000000000009
 __fortify_strlen include/linux/fortify-string.h:268 [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+0xc2/0x3b0 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+0x3b2/0x3e0 kernel/locking/lockdep.c:5879
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 trace_call_bpf+0x5a9/0x850 kernel/trace/bpf_trace.c:148
 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10918
 do_perf_trace_lock include/trace/events/lock.h:50 [inline]
 perf_trace_lock+0x2f8/0x3b0 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+0x3b2/0x3e0 kernel/locking/lockdep.c:5879
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 ref_tracker_free+0xef/0x7d0 lib/ref_tracker.c:307
 netdev_tracker_free include/linux/netdevice.h:4369 [inline]
 netdev_put include/linux/netdevice.h:4386 [inline]
 unregister_netdevice_many_notify+0x1ce1/0x1ff0 net/core/dev.c:12211
 ops_exit_rtnl_list net/core/net_namespace.c:186 [inline]
 ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:247
 setup_net+0x2d3/0x320 net/core/net_namespace.c:453
 copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570
 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
 copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:175
 copy_process+0x1733/0x3c00 kernel/fork.c:2178
 kernel_clone+0x21e/0x840 kernel/fork.c:2605
 __do_sys_clone kernel/fork.c:2748 [inline]
 __se_sys_clone kernel/fork.c:2732 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2732
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff38e38eba9
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:00007ff38f1d6fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ff38e5d5fa0 RCX: 00007ff38e38eba9
RDX: ffffffff81000000 RSI: 0000000000000000 RDI: 00000000e6003000
RBP: 00007ff38e411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ff38e5d6038 R14: 00007ff38e5d5fa0 R15: 00007ffefb842878
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1301 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217
Code: 08 b0 a0 92 65 8b 15 18 f1 e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 <83> fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c
RSP: 0018:ffffc900041dee70 EFLAGS: 00000046
RAX: ffffffff81bff449 RBX: ffffffff81a06e4a RCX: ffff8880273e0000
RDX: 0000000000000000 RSI: ffffffff99b008c0 RDI: ffffffff99df5400
RBP: ffffc900041df030 R08: 0000000000000000 R09: ffffffff81a06e4a
R10: dffffc0000000000 R11: ffffffff854e51a0 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff99df56f8 R15: ffffffff99df5400
FS:  0000000000000000(0000) GS:ffff888125c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f595f2f3e9c CR3: 00000000223b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 arch_touch_nmi_watchdog+0x9/0x20 kernel/watchdog.c:137
 touch_nmi_watchdog include/linux/nmi.h:147 [inline]
 serial8250_console_write+0xd2/0x1ba0 drivers/tty/serial/8250/8250_port.c:3350
 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
 dev_vprintk_emit+0x337/0x3f0 drivers/base/core.c:4914
 dev_printk_emit+0xe0/0x130 drivers/base/core.c:4925
 __netdev_printk+0x3d7/0x4d0 net/core/dev.c:12598
 netdev_warn+0x10a/0x160 net/core/dev.c:12651
 ieee802154_subif_start_xmit+0x136/0x190 net/mac802154/tx.c:232
 __netdev_start_xmit include/linux/netdevice.h:5222 [inline]
 netdev_start_xmit include/linux/netdevice.h:5231 [inline]
 xmit_one net/core/dev.c:3839 [inline]
 dev_hard_start_xmit+0x2d4/0x830 net/core/dev.c:3855
 sch_direct_xmit+0x241/0x4b0 net/sched/sch_generic.c:344
 __dev_xmit_skb net/core/dev.c:4114 [inline]
 __dev_queue_xmit+0x1857/0x3b50 net/core/dev.c:4691
 dev_queue_xmit include/linux/netdevice.h:3361 [inline]
 tx+0x6b/0x190 drivers/block/aoe/aoenet.c:62
 kthread+0x1cd/0x3e0 drivers/block/aoe/aoecmd.c:1241
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>