INFO: rcu detected stall in tun_chr_close

Status: upstream: reported on 2026/08/11 00:09
Reported-by: syzbot+709a638936644a01d41e@syzkaller.appspotmail.com
First crash: 2d20h, last: 2d20h
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in tun_chr_close (3) netfilter 1 1 2208d 2208d 0/29 auto-closed as invalid on 2020/10/25 04:38
upstream INFO: rcu detected stall in tun_chr_close (7) mm net 1 2 372d 452d 0/29 auto-obsoleted due to no activity on 2025/11/04 06:54
upstream INFO: rcu detected stall in tun_chr_close (2) netfilter 1 1 2349d 2349d 0/29 closed as invalid on 2020/05/30 17:14
upstream INFO: rcu detected stall in tun_chr_close (4) bpf net 1 3 1668d 1739d 0/29 closed as invalid on 2022/02/08 10:00
upstream INFO: rcu detected stall in tun_chr_close net 1 13 2803d 2883d 0/29 auto-closed as invalid on 2019/06/08 11:01
linux-5.15 INFO: rcu detected stall in tun_chr_close (3) 1 1 126d 126d 0/3 auto-obsoleted due to no activity on 2026/07/18 10:54
linux-5.15 INFO: rcu detected stall in tun_chr_close (2) 1 1 706d 706d 0/3 auto-obsoleted due to no activity on 2024/12/15 18:42
linux-5.15 INFO: rcu detected stall in tun_chr_close 1 1 942d 942d 0/3 auto-obsoleted due to no activity on 2024/04/23 00:30
upstream INFO: rcu detected stall in tun_chr_close (5) net 1 1 1167d 1167d 0/29 auto-obsoleted due to no activity on 2023/09/01 17:23
upstream INFO: rcu detected stall in tun_chr_close (6) net mm 1 19 549d 788d 0/29 auto-obsoleted due to no activity on 2025/05/11 04:14
android-5-15 BUG: soft lockup in tun_chr_close 1 3 814d 844d 0/2 auto-obsoleted due to no activity on 2024/08/19 06:38

Sample crash report:
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2647 jiffies s: 1253 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4532 Comm: syz.2.53 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_preemption_disabled+0x3/0x110 lib/smp_processor_id.c:13
Code: bc 8c 4c 89 f6 e8 dd 53 0d fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 80 5d df 8a 48 c7 c6 c0 5d df 8a eb 00 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65
RSP: 0018:ffffc900001e04a8 EFLAGS: 00000086
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8a8c2920 RDI: ffffffff8adf5de0
RBP: ffffc900001e05c8 R08: dffffc0000000000 R09: 1ffffffff2162048
R10: dffffc0000000000 R11: fffffbfff2162049 R12: 0000000000000001
R13: 1ffff9200003c0a4 R14: 0000000000000046 R15: dffffc0000000000
FS:  00007f595a8056c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fc13ff8 CR3: 0000000074f13000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
 lock_acquire+0x1cb/0x4a0 kernel/locking/lockdep.c:5678
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:883 [inline]
 pfn_valid include/linux/mmzone.h:1857 [inline]
 __virt_addr_valid+0x1a5/0x540 arch/x86/mm/physaddr.c:65
 kasan_addr_to_slab+0x9/0xc0 mm/kasan/common.c:36
 __kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:471
 irq_work_queue_on+0x10f/0x260 kernel/irq_work.c:140
 rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 a2 7c 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0ae0 EFLAGS: 00000206
RAX: 9315a29ce0650c00 RBX: 1ffff9200003c164 RCX: 9315a29ce0650c00
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc900001e0bd0 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
 __run_hrtimer kernel/time/hrtimer.c:1751 [inline]
 __hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
 hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:unwind_next_frame+0x3bf/0x1fd0 arch/x86/kernel/unwind_orc.c:461
Code: 28 84 c0 0f 85 0d 16 00 00 41 c6 06 01 49 c7 c4 40 8d 89 8a 4d 8d 6c 24 04 4d 8d 74 24 05 4d 89 ef 49 c1 ef 03 41 0f b6 04 2f <84> c0 0f 85 3f 15 00 00 4c 89 f0 48 c1 e8 03 0f b6 04 28 84 c0 0f
RSP: 0018:ffffc9000549f7d0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffffc9000549f8c8 RCX: ffffffff8e2fb43c
RDX: ffffffff8e9efcda RSI: ffffffff8e2fb438 RDI: ffffffff8138fb37
RBP: dffffc0000000000 R08: 0000000000000007 R09: ffffc9000549f918
R10: dffffc0000000000 R11: fffff52000a93f25 R12: ffffffff8e9efcda
R13: ffffffff8e9efcde R14: ffffffff8e9efcdf R15: 1ffffffff1d3df9b
 __unwind_start+0x51a/0x650 arch/x86/kernel/unwind_orc.c:717
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 __kmem_cache_free+0xb6/0x200 mm/slub.c:3700
 sk_prot_free net/core/sock.c:2096 [inline]
 __sk_destruct+0x4bb/0x650 net/core/sock.c:2182
 sock_put include/net/sock.h:2086 [inline]
 tun_detach drivers/net/tun.c:707 [inline]
 tun_chr_close+0x17a/0x1b0 drivers/net/tun.c:3495
 __fput+0x20a/0x8b0 fs/file_table.c:320
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f595999e0d9
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:00007f595a805028 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f5959c25fa0 RCX: 00007f595999e0d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 00007f5959a35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5959c26038 R14: 00007f5959c25fa0 R15: 00007fff636a9798
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/11 00:09 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in tun_chr_close
* Struck through repros no longer work on HEAD.