Message-ID: <6721a2f2.050a0220.4735a.0266.GAE@google.com>
Date: Tue, 29 Oct 2024 20:07:30 -0700
From: syzbot <syzbot+bb0c3b50c40032b58091@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, netdev@...r.kernel.org, pasha.tatashin@...een.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [mm?] INFO: rcu detected stall in kthreadd (2)

Hello,

syzbot found the following issue on:

HEAD commit:    6d858708d465 Merge branch 'net-ethernet-freescale-use-pa-t..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=119e7287980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e7f0cac6eaefe81d
dashboard link: https://syzkaller.appspot.com/bug?extid=bb0c3b50c40032b58091
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=13d44230580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15666f57980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/88c678a36ec8/disk-6d858708.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b19b4fbbd593/vmlinux-6d858708.xz
kernel image: https://storage.googleapis.com/syzbot-assets/18fef9c3fe20/bzImage-6d858708.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bb0c3b50c40032b58091@...kaller.appspotmail.com

sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=7697, q=2518875 ncpus=2)
task:kthreadd        state:R  running task     stack:24560 pid:2     tgid:2     ppid:0      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6682
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7004
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217
Code: 00 d8 03 00 65 8b 15 a0 f0 6e 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00 00 <83> fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc
RSP: 0018:ffffc900000775d0 EFLAGS: 00000246
RAX: ffffffff820b6c02 RBX: dffffc0000000000 RCX: ffff8881404a9e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000040
RBP: dffffc0000000000 R08: ffffffff820b6bd8 R09: 1ffffffff2859900
R10: dffffc0000000000 R11: fffffbfff2859901 R12: ffff88801e1605d0
R13: 1ffffffff34887b4 R14: 0000000000000000 R15: 0000000000000000
 __page_table_check_zero+0x102/0x350 mm/page_table_check.c:153
 page_table_check_free include/linux/page_table_check.h:41 [inline]
 free_pages_prepare mm/page_alloc.c:1109 [inline]
 free_unref_page+0xd0f/0xf20 mm/page_alloc.c:2638
 discard_slab mm/slub.c:2677 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3145
 put_cpu_partial+0x17c/0x250 mm/slub.c:3220
 __slab_free+0x2ea/0x3d0 mm/slub.c:4449
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_kmalloc+0x23/0xb0 mm/kasan/common.c:385
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4276
 kmalloc_noprof include/linux/slab.h:882 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 lsm_blob_alloc security/security.c:685 [inline]
 lsm_cred_alloc security/security.c:702 [inline]
 security_prepare_creds+0x53/0x360 security/security.c:3240
 prepare_creds+0x467/0x640 kernel/cred.c:242
 copy_creds+0x109/0x9c0 kernel/cred.c:312
 copy_process+0x9df/0x3d50 kernel/fork.c:2237
 kernel_clone+0x226/0x8f0 kernel/fork.c:2784
 kernel_thread+0x1bc/0x240 kernel/fork.c:2846
 create_kthread kernel/kthread.c:412 [inline]
 kthreadd+0x60d/0x810 kernel/kthread.c:767
 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>
rcu: rcu_preempt kthread starved for 9045 jiffies! g7697 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:21840 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615
 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>
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: 24 Comm: ksoftirqd/1 Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_preemption_disabled+0x42/0x120 lib/smp_processor_id.c:55
Code: 08 65 8b 1d dc d2 3c 74 65 8b 05 d1 d2 3c 74 a9 ff ff ff 7f 74 26 65 48 8b 04 25 28 00 00 00 48 3b 44 24 08 0f 85 ce 00 00 00 <89> d8 48 83 c4 10 5b 41 5c 41 5e 41 5f c3 cc cc cc cc 48 c7 04 24
RSP: 0018:ffffc900001e69e8 EFLAGS: 00000246
RAX: bcc40fbadd619200 RBX: 0000000000000001 RCX: ffffffff817056d4
RDX: 0000000000000000 RSI: ffffffff8c60fb00 RDI: ffffffff8c60fac0
RBP: ffffc900001e6b88 R08: ffffffff901d11af R09: 1ffffffff203a235
R10: dffffc0000000000 R11: fffffbfff203a236 R12: 1ffff9200003cd50
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8a4c39a4
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e012ad198 CR3: 000000000e734000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:737
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0xe3/0x550 kernel/locking/lockdep.c:5796
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 l3mdev_master_ifindex include/net/l3mdev.h:69 [inline]
 ip_route_me_harder+0x571/0x1360 net/ipv4/netfilter.c:49
 synproxy_send_tcp+0x356/0x6c0 net/netfilter/nf_synproxy_core.c:431
 synproxy_send_client_synack+0x8b8/0xf30 net/netfilter/nf_synproxy_core.c:484
 nft_synproxy_eval_v4+0x3ca/0x610 net/netfilter/nft_synproxy.c:59
 nft_synproxy_do_eval+0x362/0xa60 net/netfilter/nft_synproxy.c:141
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x4ad/0x1da0 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x418/0x6b0 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
 __netif_receive_skb_one_core net/core/dev.c:5668 [inline]
 __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5781
 process_backlog+0x662/0x15b0 net/core/dev.c:6113
 __napi_poll+0xcb/0x490 net/core/dev.c:6834
 napi_poll net/core/dev.c:6903 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:7025
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 run_ksoftirqd+0xca/0x130 kernel/softirq.c:927
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 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>


---
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