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linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: C20244000C X-Stat-Signature: 45fqokkf9t6fkkrut1ypz3q1hqokxosn X-Rspam-User: X-HE-Tag: 1762500688-655271 X-HE-Meta: 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link: https://syzkaller.appspot.com/bug?extid=d5f7a5097c24c7c2dbbb compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=134820b4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bef31d61ceb8/disk-b1d91548.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/67c31be6c377/vmlinux-b1d91548.xz kernel image: https://storage.googleapis.com/syzbot-assets/7b9f62743e14/bzImage-b1d91548.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d5f7a5097c24c7c2dbbb@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=12991 jiffies, g=11121, q=1246 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 3112 (4294972946-4294969834), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 3112 jiffies! g11121 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:27288 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6005 Comm: kworker/R-wg-cr Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: wg-crypt-wg2 wg_packet_tx_worker RIP: 0010:rb_erase+0xb/0xe60 lib/rbtree.c:441 Code: ca 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 <41> 54 53 48 83 ec 28 48 89 f3 49 89 fd 48 b9 00 00 00 00 00 fc ff RSP: 0018:ffffc90000a08ce0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880b8927c90 RCX: ffff88801f7a5ac0 RDX: 0000000000010000 RSI: ffff8880b8927c90 RDI: ffff88807de66340 RBP: 1ffff1100fbccc68 R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: ffff8880b8927c98 R13: dffffc0000000000 R14: ffff88807de66340 R15: 1ffff11017124f93 FS: 0000000000000000(0000) GS:ffff88812623c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056323a462a38 CR3: 000000002891e000 CR4: 00000000003526f0 Call Trace: rb_erase_cached include/linux/rbtree.h:126 [inline] timerqueue_del+0xae/0x100 lib/timerqueue.c:57 __remove_hrtimer kernel/time/hrtimer.c:1114 [inline] __run_hrtimer kernel/time/hrtimer.c:1757 [inline] __hrtimer_run_queues+0x364/0xc60 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:queued_write_lock_slowpath+0x125/0x260 kernel/locking/qrwlock.c:85 Code: 00 01 00 00 43 0f b6 04 27 84 c0 74 35 89 d9 80 e1 07 80 c1 03 38 c1 7c 29 48 89 df e8 e4 b8 dc f6 eb 1f f3 90 43 0f b6 04 27 <84> c0 74 14 89 d9 80 e1 07 80 c1 03 38 c1 7c 08 48 89 df e8 c3 b8 RSP: 0018:ffffc90003337300 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffffff8f3dd900 RCX: ffffffff8b490058 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8f3dd900 RBP: ffffc900033373b0 R08: ffffffff8f3dd903 R09: 1ffffffff1e7bb20 R10: dffffc0000000000 R11: fffffbfff1e7bb21 R12: dffffc0000000000 R13: 1ffff92000666e64 R14: ffffc90003337350 R15: 1ffffffff1e7bb20 queued_write_lock include/asm-generic/qrwlock.h:101 [inline] do_raw_write_lock+0x1f2/0x260 kernel/locking/spinlock_debug.c:211 ___neigh_create+0xe81/0x2260 net/core/neighbour.c:690 ip6_finish_output2+0x1175/0x1480 net/ipv6/ip6_output.c:128 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 ip6tunnel_xmit include/net/ip6_tunnel.h:162 [inline] udp_tunnel6_xmit_skb+0x68d/0xb30 net/ipv6/ip6_udp_tunnel.c:112 send6+0x5ac/0x8d0 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1c8/0x7c0 drivers/net/wireguard/send.c:276 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 rescuer_thread+0x53c/0xdd0 kernel/workqueue.c:3523 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup