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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1908:b0:3d3:dd32:73d5 with SMTP id e9e14a558f8ab-3da5b23bd53mr112709665ab.4.1746540400213; Tue, 06 May 2025 07:06:40 -0700 (PDT) Date: Tue, 06 May 2025 07:06:40 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <681a1770.050a0220.a19a9.000d.GAE@google.com> Subject: [syzbot] [net?] INFO: rcu detected stall in inet_rtm_newaddr (2) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 01f95500a162 Merge tag 'uml-for-linux-6.15-rc6' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1347702f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=b39cb28b0a399ed3 dashboard link: https://syzkaller.appspot.com/bug?extid=51cd74c5dfeafd65e488 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16cd49b3980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/18300d795306/disk-01f95500.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6d358d59c6dc/vmlinux-01f95500.xz kernel image: https://storage.googleapis.com/syzbot-assets/bcdf944974fd/bzImage-01f95500.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+51cd74c5dfeafd65e488@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=530c/1/0x4000000000000000 softirq=17280/17282 fqs=3 rcu: (detected by 1, t=10506 jiffies, g=8293, q=1787 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5923 Comm: syz-executor Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 RIP: 0010:pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:577 [inline] RIP: 0010:queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline] RIP: 0010:do_raw_spin_unlock+0x172/0x230 kernel/locking/spinlock_debug.c:142 Code: 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 ba 00 00 00 48 83 3d 28 ba 89 0c 00 74 4e 48 89 df e8 0e 15 d7 09 <90> 5b 5d 41 5c c3 cc cc cc cc 48 c7 c6 e0 6c 8d 8b 48 89 df e8 45 RSP: 0018:ffffc90000007ce8 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffffffff9ad4e378 RCX: ffffffff81985ed3 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffffff9ad4e378 RBP: ffffffff9ad4e380 R08: 0000000000000000 R09: fffffbfff35a9c6f R10: ffffffff9ad4e37b R11: ffffffff9ad4e378 R12: ffffffff9ad4e388 R13: ffff88807bc05340 R14: dffffc0000000000 R15: 1ffff92000000fa8 FS: 0000555577c53500(0000) GS:ffff8881249df000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555562d75808 CR3: 000000005fb8a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock_irqrestore+0x22/0x80 kernel/locking/spinlock.c:194 debug_object_activate+0x2ec/0x4c0 lib/debugobjects.c:836 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline] debug_activate kernel/time/hrtimer.c:484 [inline] enqueue_hrtimer+0x23/0x3b0 kernel/time/hrtimer.c:1088 __run_hrtimer kernel/time/hrtimer.c:1778 [inline] __hrtimer_run_queues+0x8ff/0xad0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:unwind_next_frame+0x671/0x20a0 arch/x86/kernel/unwind_orc.c:581 Code: 84 f7 0f 85 a4 15 00 00 83 e0 07 38 c2 40 0f 9e c6 84 d2 0f 95 c0 40 84 c6 0f 85 8d 15 00 00 4c 0f bf 31 4d 01 fe 0f b6 41 05 <83> e0 07 3c 03 0f 84 bd 08 00 00 3c 04 0f 84 f6 07 00 00 3c 02 0f RSP: 0018:ffffc9000477ec48 EFLAGS: 00000292 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff91275258 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffc9000477ed00 R08: ffffffff9127525c R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000012081 R12: ffffc9000477ed08 R13: ffffc9000477ecb8 R14: ffffc9000477f040 R15: ffffc9000477f018 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_node_noprof+0x1d5/0x3b0 mm/slub.c:4248 __alloc_skb+0x2b2/0x380 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1340 [inline] nlmsg_new include/net/netlink.h:1019 [inline] rtmsg_fib+0x13e/0x520 net/ipv4/fib_semantics.c:552 fib_table_insert+0xbaf/0x1c40 net/ipv4/fib_trie.c:1380 fib_magic+0x4d4/0x5c0 net/ipv4/fib_frontend.c:1133 fib_add_ifaddr+0x3a1/0x580 net/ipv4/fib_frontend.c:1170 fib_inetaddr_event+0x147/0x270 net/ipv4/fib_frontend.c:1469 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 blocking_notifier_call_chain kernel/notifier.c:380 [inline] blocking_notifier_call_chain+0x69/0xa0 kernel/notifier.c:368 __inet_insert_ifa+0x925/0xcd0 net/ipv4/devinet.c:567 inet_rtm_newaddr+0xd87/0x1540 net/ipv4/devinet.c:1002 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] __sys_sendto+0x495/0x510 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f87d9f907fc Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b RSP: 002b:00007fff248eaf20 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f87dace4620 RCX: 00007f87d9f907fc RDX: 0000000000000028 RSI: 00007f87dace4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fff248eaf74 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f87dace4670 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10490 jiffies! g8293 f0x0 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:27704 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x116f/0x5de0 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6860 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2046 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2248 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 101 PID: 5480 Comm: dhcpcd Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 RIP: 0010:write_comp_data+0x8b/0x90 kernel/kcov.c:272 Code: 00 00 4a 8d 34 dd 28 00 00 00 48 39 f2 72 1b 48 83 c7 01 48 89 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 RSP: 0018:ffffc90002ea77b0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8441720 RCX: ffffffff81af1bb9 RDX: ffff88802577c880 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed10170882e5 R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880b853b040 FS: 00007fe629d36740(0000) GS:ffff888124adf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b10a151068 CR3: 0000000025463000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:340 [inline] smp_call_function_many_cond+0x4c9/0x1290 kernel/smp.c:885 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline] flush_tlb_mm_range+0x322/0x1780 arch/x86/mm/tlb.c:1365 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:470 [inline] tlb_flush_mmu mm/mmu_gather.c:403 [inline] tlb_finish_mmu+0x3c9/0x7b0 mm/mmu_gather.c:496 vms_clear_ptes+0x55e/0x770 mm/vma.c:1191 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1233 do_vmi_align_munmap+0x43b/0x7d0 mm/vma.c:1492 __do_sys_brk+0x8d3/0xaa0 mm/mmap.c:176 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe629e04c7c Code: 1a 64 c7 03 01 00 00 00 eb 11 64 44 89 23 31 f6 5b 31 ff 5d 41 5c e9 41 ff ff ff 5b 83 c8 ff 5d 41 5c c3 b8 0c 00 00 00 0f 05 <48> 8b 15 d5 61 0d 00 45 31 c0 48 89 02 48 39 c7 76 12 48 8b 05 73 RSP: 002b:00007fffc7ef0748 EFLAGS: 00000206 ORIG_RAX: 000000000000000c RAX: ffffffffffffffda RBX: fffffffffffdf000 RCX: 00007fe629e04c7c RDX: 0000558eaa832990 RSI: 0000558eaa6f2010 RDI: 0000558eaa853000 RBP: 0000000000041670 R08: 0000000000000000 R09: ba568e78e099c46f R10: 00007fffc7ef06a8 R11: 0000000000000206 R12: 0000558eaa874000 R13: 0000558eaa863f20 R14: 00007fe629edbaa0 R15: 00007fffc7ef0978 --- 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