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Message-ID: <67fc8e73.050a0220.2970f9.03bf.GAE@google.com> Date: Sun, 13 Apr 2025 21:26:27 -0700 From: syzbot <syzbot+2e90866706ad999df132@...kaller.appspotmail.com> To: a@...table.cc, antonio@...delbit.com, b.a.t.m.a.n@...ts.open-mesh.org, davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, marek.lindner@...lbox.org, mareklindner@...mailbox.ch, netdev@...r.kernel.org, pabeni@...hat.com, sven@...fation.org, sw@...onwunderlich.de, syzkaller-bugs@...glegroups.com Subject: [syzbot] [batman?] INFO: rcu detected stall in rtnl_newlink (5) Hello, syzbot found the following issue on: HEAD commit: 0bc21e701a6f MAINTAINERS: Remove Olof from SoC maintainers git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15496418580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1c541fa8af5c9cc7 dashboard link: https://syzkaller.appspot.com/bug?extid=2e90866706ad999df132 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13ac8edf980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6990abb5f3fd/disk-0bc21e70.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8ac1e086ff34/vmlinux-0bc21e70.xz kernel image: https://storage.googleapis.com/syzbot-assets/a651c0a21f54/bzImage-0bc21e70.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2e90866706ad999df132@...kaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (3 ticks this GP) idle=50a4/1/0x4000000000000000 softirq=13521/13521 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5941 rcu: (detected by 1, t=10503 jiffies, g=9229, q=1722 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5941 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d 84 ef 8e 0c 48 89 de 5b e9 73 f7 5a 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 00 d6 03 00 65 8b 15 10 62 RSP: 0018:ffffc90000007c08 EFLAGS: 00000097 RAX: 0000000000010000 RBX: 0000000000000cb2 RCX: ffff888031ac1e00 RDX: 0000000000010000 RSI: 0000000000000cb2 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff89cdbe94 R09: 1ffff11006591a90 R10: dffffc0000000000 R11: ffffed1006591a91 R12: 0000000000000004 R13: ffff888032c8d408 R14: ffff888032c8d400 R15: 0000000000000001 FS: 000055557bfba500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558e0f8a4d88 CR3: 000000007c3fc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> taprio_set_budgets+0x17d/0x370 net/sched/sch_taprio.c:666 advance_sched+0x98d/0xca0 net/sched/sch_taprio.c:977 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x59b/0xd30 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_flush_all+0x996/0xeb0 Code: 48 21 c3 0f 85 16 02 00 00 e8 f6 ad 20 00 4c 8b 7c 24 10 4d 85 f6 75 07 e8 e7 ad 20 00 eb 06 e8 e0 ad 20 00 fb 48 8b 5c 24 18 <48> 8b 44 24 30 42 80 3c 28 00 74 08 48 89 df e8 c6 15 87 00 4c 8b RSP: 0018:ffffc90003226740 EFLAGS: 00000293 RAX: ffffffff817ec600 RBX: ffffffff8f174fd8 RCX: ffff888031ac1e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900032268f0 R08: ffffffff817ec5d7 R09: 1ffffffff2854910 R10: dffffc0000000000 R11: fffffbfff2854911 R12: ffffffff8f174f80 R13: dffffc0000000000 R14: 0000000000000200 R15: ffffc90003226940 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline] console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3309 vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432 _printk+0xd5/0x120 kernel/printk/printk.c:2457 batadv_check_known_mac_addr+0x2b1/0x410 net/batman-adv/hard-interface.c:526 batadv_hard_if_event+0x3a5/0x1810 net/batman-adv/hard-interface.c:998 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9212 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9226 do_setlink+0x74b/0x4210 net/core/rtnetlink.c:3064 rtnl_changelink net/core/rtnetlink.c:3723 [inline] __rtnl_newlink net/core/rtnetlink.c:3875 [inline] rtnl_newlink+0x1bb6/0x2210 net/core/rtnetlink.c:4012 rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6922 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:726 __sys_sendto+0x363/0x4c0 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2200 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f47d6587bbc 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:00007f47d689f630 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f47d72a4620 RCX: 00007f47d6587bbc RDX: 000000000000002c RSI: 00007f47d72a4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007f47d689f684 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f47d72a4670 R15: 0000000000000000 </TASK> task:syz-executor state:R running task stack:19216 pid:5941 tgid:5941 ppid:5926 flags:0x0000400a Call Trace: <TASK> </TASK> rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g9229 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=5557 rcu: rcu_preempt kthread starved for 10503 jiffies! g9229 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 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:I stack:25880 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5941 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline] RIP: 0010:mark_lock+0xa2/0x360 kernel/locking/lockdep.c:4727 Code: 00 8b 1b 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 80 48 2a 94 be 08 00 00 00 e8 06 b7 8a 00 48 0f a3 1d 2e 21 af 12 <73> 10 48 69 c3 c8 00 00 00 48 8d 98 40 c7 c1 93 eb 68 48 c7 c0 c0 RSP: 0018:ffffc900000078e8 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff817b274a RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff942a4880 RBP: 0000000000000008 R08: ffffffff942a4887 R09: 1ffffffff2854910 R10: dffffc0000000000 R11: fffffbfff2854911 R12: ffff888031ac28c4 R13: dffffc0000000000 R14: 0000000000000100 R15: ffff888031ac29d0 FS: 000055557bfba500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558e0f8a4d88 CR3: 000000007c3fc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> mark_usage kernel/locking/lockdep.c:4670 [inline] __lock_acquire+0xc3e/0x2100 kernel/locking/lockdep.c:5180 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 debug_object_deactivate+0x158/0x390 lib/debugobjects.c:873 debug_hrtimer_deactivate kernel/time/hrtimer.c:433 [inline] debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:475 __run_hrtimer kernel/time/hrtimer.c:1707 [inline] __hrtimer_run_queues+0x305/0xd30 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_flush_all+0x996/0xeb0 Code: 48 21 c3 0f 85 16 02 00 00 e8 f6 ad 20 00 4c 8b 7c 24 10 4d 85 f6 75 07 e8 e7 ad 20 00 eb 06 e8 e0 ad 20 00 fb 48 8b 5c 24 18 <48> 8b 44 24 30 42 80 3c 28 00 74 08 48 89 df e8 c6 15 87 00 4c 8b RSP: 0018:ffffc90003226740 EFLAGS: 00000293 RAX: ffffffff817ec600 RBX: ffffffff8f174fd8 RCX: ffff888031ac1e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900032268f0 R08: ffffffff817ec5d7 R09: 1ffffffff2854910 R10: dffffc0000000000 R11: fffffbfff2854911 R12: ffffffff8f174f80 R13: dffffc0000000000 R14: 0000000000000200 R15: ffffc90003226940 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline] console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3309 vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432 _printk+0xd5/0x120 kernel/printk/printk.c:2457 batadv_check_known_mac_addr+0x2b1/0x410 net/batman-adv/hard-interface.c:526 batadv_hard_if_event+0x3a5/0x1810 net/batman-adv/hard-interface.c:998 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9212 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9226 do_setlink+0x74b/0x4210 net/core/rtnetlink.c:3064 rtnl_changelink net/core/rtnetlink.c:3723 [inline] __rtnl_newlink net/core/rtnetlink.c:3875 [inline] rtnl_newlink+0x1bb6/0x2210 net/core/rtnetlink.c:4012 rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6922 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:726 __sys_sendto+0x363/0x4c0 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2200 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f47d6587bbc 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:00007f47d689f630 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f47d72a4620 RCX: 00007f47d6587bbc RDX: 000000000000002c RSI: 00007f47d72a4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007f47d689f684 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f47d72a4670 R15: 0000000000000000 </TASK> --- 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@...glegroups.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
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