BUG: soft lockup in tun_chr

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-5-15	BUG: soft lockup in tun_chr_ioctl				5	316d	347d	0/2	auto-obsoleted due to no activity on 2024/08/26 13:02
watchdog: BUG: soft lockup - CPU#0 stuck for 226s! [syz.6.2346:8900]
Modules linked in:
CPU: 0 PID: 8900 Comm: syz.6.2346 Not tainted 6.1.115-syzkaller-00009-gaffd0c026349 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x147/0x180 arch/x86/kernel/kvm.c:1064
Code: 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 34 41 0f b6 45 00 44 38 f0 75 10 66 90 0f 00 2d db ea 50 04 fb f4 <e9> 24 ff ff ff fb e9 1e ff ff ff 44 89 e9 80 e1 07 38 c1 7c a3 4c
RSP: 0018:ffffc90000d6f400 EFLAGS: 00000246
RAX: 0000000000000003 RBX: 1ffff920001ade84 RCX: 0000000087bd0e00
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffffffff87bd0e40
RBP: ffffc90000d6f4b0 R08: dffffc0000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffffff87bd0e40 R14: 0000000000000003 R15: 1ffff920001ade88
FS:  00007f2a4e3116c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c26fe26 CR3: 00000001263b1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x6de/0xda0 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0x139/0x1b0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 __register_sysctl_table+0x7ef/0x1060 fs/proc/proc_sysctl.c:1351
 register_net_sysctl+0x246/0x260 net/sysctl_net.c:169
 neigh_sysctl_register+0x3ec/0x4d0 net/core/neighbour.c:3847
 devinet_sysctl_register+0xaa/0x1e0 net/ipv4/devinet.c:2649
 inetdev_init+0x2bf/0x4f0 net/ipv4/devinet.c:280
 inetdev_event+0x205/0x1110 net/ipv4/devinet.c:1547
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1978 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2016 [inline]
 call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2030
 register_netdevice+0x10cf/0x1490 net/core/dev.c:10156
 tun_set_iff+0x836/0xee0 drivers/net/tun.c:2851
 __tun_chr_ioctl+0x80e/0x22d0 drivers/net/tun.c:3114
 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:3401
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x114/0x190 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x98/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2a4d57ff19
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:00007f2a4e311058 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2a4d745fa0 RCX: 00007f2a4d57ff19
RDX: 0000000020000180 RSI: 00000000400454ca RDI: 0000000000000009
RBP: 00007f2a4d5f3cc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2a4d745fa0 R15: 00007ffee22733c8
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7004 Comm: kworker/u4:38 Not tainted 6.1.115-syzkaller-00009-gaffd0c026349 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: netns cleanup_net
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0x117/0x180 arch/x86/kernel/kvm.c:1058
Code: 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 53 41 0f b6 45 00 44 38 f0 0f 85 63 ff ff ff 66 90 0f 00 2d 0a eb 50 04 f4 <e9> 54 ff ff ff fa 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b
RSP: 0018:ffffc90000f371c0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: 1ffff920001e6e3c RCX: ffffffff8521d43c
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881f6f279c0
RBP: ffffc90000f37270 R08: dffffc0000000000 R09: ffffed103ede4f39
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f6f279c0 R14: 0000000000000003 R15: 1ffff920001e6e40
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ac4609666 CR3: 0000000132061000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x6de/0xda0 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0x139/0x1b0 kernel/locking/spinlock.c:154
 krc_this_cpu_lock kernel/rcu/tree.c:3035 [inline]
 add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3355 [inline]
 kvfree_call_rcu+0x12d/0x800 kernel/rcu/tree.c:3446
 trie_delete_elem+0x5a6/0x760 kernel/bpf/lpm_trie.c:532
 bpf_prog_5186c38a4019a4cb+0x42/0x46
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2271 [inline]
 bpf_trace_run3+0x177/0x2e0 kernel/trace/bpf_trace.c:2311
 __bpf_trace_timer_start+0x2b/0x40 include/trace/events/timer.h:53
 trace_timer_start include/trace/events/timer.h:53 [inline]
 enqueue_timer+0x303/0x480 kernel/time/timer.c:615
 internal_add_timer kernel/time/timer.c:640 [inline]
 __mod_timer+0x8d3/0xcf0 kernel/time/timer.c:1121
 add_timer+0x68/0x80 kernel/time/timer.c:1218
 __queue_delayed_work+0x16d/0x1f0 kernel/workqueue.c:1686
 mod_delayed_work_on+0xee/0x190 kernel/workqueue.c:1749
 mod_delayed_work include/linux/workqueue.h:540 [inline]
 schedule_delayed_monitor_work kernel/rcu/tree.c:3213 [inline]
 kvfree_call_rcu+0x5e3/0x800 kernel/rcu/tree.c:3472
 drop_sysctl_table+0x311/0x450 fs/proc/proc_sysctl.c:1727
 unregister_sysctl_table+0x76/0x120 fs/proc/proc_sysctl.c:1765
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175
 ip4_frags_ns_ctl_unregister net/ipv4/ip_fragment.c:630 [inline]
 ipv4_frags_exit_net+0x60/0xa0 net/ipv4/ip_fragment.c:698
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x64b/0xbf0 net/core/net_namespace.c:604
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>