Date: Mon, 27 May 2024 14:43:19 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: syzbot <syzbot+a7d2b1d5d1af83035567@...kaller.appspotmail.com>
Cc: davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, 
	willemdebruijn.kernel@...il.com, Vladimir Oltean <vladimir.oltean@....com>, 
	Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: Re: [syzbot] [net?] INFO: rcu detected stall in packet_release

On Mon, May 27, 2024 at 2:16 PM syzbot
<syzbot+a7d2b1d5d1af83035567@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    3ab5720881a9 net: phy: at803x: replace msleep(1) with usle..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=16ac8a6ee80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8f565e10f0b1e1fc
> dashboard link: https://syzkaller.appspot.com/bug?extid=a7d2b1d5d1af83035567
> 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=1086b376e80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16760ccee80000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/ab97503560c5/disk-3ab57208.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/ca56b0dccaf8/vmlinux-3ab57208.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/03161a7d4885/bzImage-3ab57208.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+a7d2b1d5d1af83035567@...kaller.appspotmail.com
>
> rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
> rcu:    0-...0: (1 GPs behind) idle=38bc/1/0x4000000000000000 softirq=6131/6133 fqs=5249
> rcu:             hardirqs   softirqs   csw/system
> rcu:     number:        0          0            0
> rcu:    cputime:        0          0            0   ==> 52510(ms)
> rcu:    (detected by 1, t=10502 jiffies, g=7301, q=303 ncpus=2)
> Sending NMI from CPU 1 to CPUs 0:
> NMI backtrace for cpu 0
> CPU: 0 PID: 5101 Comm: syz-executor577 Not tainted 6.7.0-rc5-syzkaller-01533-g3ab5720881a9 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
> RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline]
> RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2569 [inline]
> RIP: 0010:atomic64_read include/linux/atomic/atomic-instrumented.h:1597 [inline]
> RIP: 0010:taprio_set_budgets+0x144/0x310 net/sched/sch_taprio.c:681
> Code: e8 03 48 89 44 24 28 e9 c1 00 00 00 e8 25 f6 e4 f8 48 8b 7c 24 20 be 08 00 00 00 e8 06 f7 3b f9 48 8b 44 24 28 42 80 3c 38 00 <0f> 85 6a 01 00 00 4c 63 64 24 08 48 8b 44 24 18 49 83 fc 0f 4c 8b
> RSP: 0018:ffffc90000007d20 EFLAGS: 00000046
> RAX: 1ffff110035e3e5c RBX: ffff8880152ecc84 RCX: ffffffff88a2a78a
> RDX: ffffed10035e3e5d RSI: 0000000000000008 RDI: ffff88801af1f2e0
> RBP: 0000000000000001 R08: 0000000000000000 R09: ffffed10035e3e5c
> R10: ffff88801af1f2e7 R11: 0000000000000002 R12: 0000000004000000
> R13: ffff8880152ecc08 R14: 0000000000000008 R15: dffffc0000000000
> FS:  0000555556770380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000600 CR3: 0000000072c1b000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <NMI>
>  </NMI>
>  <IRQ>
>  advance_sched+0x5e1/0xc60 net/sched/sch_taprio.c:988
>  __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
>  __hrtimer_run_queues+0x203/0xc20 kernel/time/hrtimer.c:1752
>  hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
>  local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
>  __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082
>  sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
>  </IRQ>
>  <TASK>
>  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
> RIP: 0010:queue_work_on+0x92/0x110 kernel/workqueue.c:1836
> Code: ff 48 89 ee e8 9f c4 31 00 48 85 ed 75 3b e8 05 c9 31 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 83 c4 31 00 48 85 db 75 66 <e8> e9 c8 31 00 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 d6 c8
> RSP: 0018:ffffc9000430f9d8 EFLAGS: 00000293
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8155d4ed
> RDX: ffff888072d5d940 RSI: ffffffff8155d4f7 RDI: 0000000000000007
> RBP: 0000000000000200 R08: 0000000000000007 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000008
> R13: 0000000000000001 R14: ffff888013072800 R15: ffff888076207200
>  queue_work include/linux/workqueue.h:562 [inline]
>  synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:519 [inline]
>  synchronize_rcu_expedited+0x5a2/0x800 kernel/rcu/tree_exp.h:1006
>  synchronize_rcu+0x2f5/0x3b0 kernel/rcu/tree.c:3568
>  synchronize_net+0x4e/0x60 net/core/dev.c:10989
>  packet_release+0xb2c/0xdd0 net/packet/af_packet.c:3167
>  __sock_release+0xae/0x260 net/socket.c:659
>  sock_close+0x1c/0x20 net/socket.c:1419
>  __fput+0x270/0xbb0 fs/file_table.c:394
>  __fput_sync+0x47/0x50 fs/file_table.c:475
>  __do_sys_close fs/open.c:1590 [inline]
>  __se_sys_close fs/open.c:1575 [inline]
>  __x64_sys_close+0x87/0xf0 fs/open.c:1575
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x63/0x6b
> RIP: 0033:0x7fd03423c0c0
> Code: ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 80 3d e1 df 07 00 00 74 17 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c
> RSP: 002b:00007ffc9b2872b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
> RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fd03423c0c0
> RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003
> RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000100000000
> R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc9b287310
> R13: 0000000000030165 R14: 00007ffc9b2872dc R15: 0000000000000003
>  </TASK>
> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.242 msecs
>
>
> ---
> 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

This is another manifestation of a long standing taprio bug.

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