Re: [syzbot] [mm?] INFO: rcu detected stall in kcompactd (2)

From: syzbot
Date: Sat Jun 01 2024 - 05:34:11 EST

Next message: Theodore Ts'o: "Re: [LSF/MM/BPF TOPIC] untorn buffered writes"
Previous message: joswang: "[PATCH 2/2] usb: dwc3: core: Workaround for CSR read timeout"
In reply to: Hillf Danton: "Re: [syzbot] [mm?] INFO: rcu detected stall in kcompactd (2)"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: rcu detected stall in batadv_nc_worker

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1272/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=17369, q=1047 ncpus=2)
task:kworker/u8:8 state:R running task stack:22656 pid:1272 tgid:1272 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5722
Code: c1 05 9a bf 96 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90004bafaa0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000975f56 RCX: 0000000072d6c7e4
RDX: 0000000000000001 RSI: ffffffff8b2cb0e0 RDI: ffffffff8b8ffec0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff284d658
R10: ffffffff9426b2c7 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8dbb18e0 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0x16e/0x10f0 net/batman-adv/network-coding.c:719
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 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 2809 jiffies! g17369 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27680 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6924
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194
__debug_object_init+0x34a/0x480 lib/debugobjects.c:645
init_timer_on_stack_key kernel/time/timer.c:859 [inline]
schedule_timeout+0x102/0x2a0 kernel/time/timer.c:2579
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 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:
CPU: 1 PID: 61 Comm: kworker/u8:4 Not tainted 6.10.0-rc1-syzkaller-00267-gcc8ed4d0a848-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:preempt_count_sub+0x63/0x160 kernel/sched/core.c:5909
Code: 57 13 85 c9 75 1b 65 8b 05 52 5f a6 7e 89 c2 81 e2 ff ff ff 7f 39 d3 7f 17 81 fb fe 00 00 00 76 71 f7 db 65 01 1d 35 5f a6 7e <5b> c3 cc cc cc cc 90 e8 a1 bd 22 03 85 c0 74 51 48 c7 c0 d4 94 e4
RSP: 0018:ffffc90000a17da8 EFLAGS: 00000293
RAX: 0000000080000303 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000303 RSI: ffffffff813cd885 RDI: 0000000000000001
RBP: ffffc90000a18ea0 R08: 0000000000000006 R09: ffffc90000a18df8
R10: ffffc90000a18ea0 R11: ffff8880b93293d8 R12: ffffc90000a11000
R13: ffffc90000a19000 R14: ffffc90000a18ea8 R15: ffffc90000a18df8
FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd06bfb0000 CR3: 000000007dec4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
unwind_next_frame+0x11ef/0x23a0 arch/x86/kernel/unwind_orc.c:672
arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:4121 [inline]
__kmalloc_noprof+0x1ec/0x410 mm/slub.c:4134
kmalloc_noprof include/linux/slab.h:664 [inline]
kzalloc_noprof include/linux/slab.h:778 [inline]
ieee802_11_parse_elems_full+0xea/0x15d0 net/mac80211/parse.c:880
ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2330 [inline]
ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2337 [inline]
ieee80211_inform_bss+0xfd/0x1140 net/mac80211/scan.c:79
rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
cfg80211_inform_single_bss_data+0x893/0x1f70 net/wireless/scan.c:2277
cfg80211_inform_bss_data+0x205/0x39d0 net/wireless/scan.c:3101
cfg80211_inform_bss_frame_data+0x271/0x7c0 net/wireless/scan.c:3191
ieee80211_bss_info_update+0x311/0xab0 net/mac80211/scan.c:226
ieee80211_scan_rx+0x47c/0xad0 net/mac80211/scan.c:340
__ieee80211_rx_handle_packet net/mac80211/rx.c:5222 [inline]
ieee80211_rx_list+0x1be1/0x2e90 net/mac80211/rx.c:5459
ieee80211_rx_napi+0xdd/0x400 net/mac80211/rx.c:5482
ieee80211_rx include/net/mac80211.h:5093 [inline]
ieee80211_tasklet_handler+0xee/0x150 net/mac80211/main.c:441
tasklet_action_common.constprop.0+0x24c/0x3e0 kernel/softirq.c:785
handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:637 [inline]
irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_switch+0x30/0x90 kernel/kcov.c:320
Code: 41 55 41 54 49 89 fc 55 48 89 f5 53 48 8b 46 08 48 83 f8 20 74 6b 77 48 48 83 f8 08 74 5b 48 83 f8 10 75 2f 41 bd 03 00 00 00 <4c> 8b 75 00 31 db 4d 85 f6 74 1e 48 8b 74 dd 10 4c 89 e2 4c 89 ef
RSP: 0018:ffffc900015c6ea8 EFLAGS: 00000246
RAX: 0000000000000008 RBX: ffffc900015c6f58 RCX: 0000000000000001
RDX: ffff888017790000 RSI: ffffffff8b29c9c0 RDI: 0000000000000002
RBP: ffffffff8b29c9c0 R08: 0000000000000001 R09: 0000000000000009
R10: 0000000000000005 R11: 0000000000000003 R12: 0000000000000002
R13: 0000000000000001 R14: ffffffff907080da R15: 0000000000000002
unwind_next_frame+0x789/0x23a0 arch/x86/kernel/unwind_orc.c:581
arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:4121 [inline]
__kmalloc_noprof+0x1ec/0x410 mm/slub.c:4134
kmalloc_noprof include/linux/slab.h:664 [inline]
kzalloc_noprof include/linux/slab.h:778 [inline]
cfg80211_inform_single_bss_data+0x530/0x1f70 net/wireless/scan.c:2249
cfg80211_inform_bss_data+0x205/0x39d0 net/wireless/scan.c:3101
cfg80211_inform_bss_frame_data+0x271/0x7c0 net/wireless/scan.c:3191
ieee80211_bss_info_update+0x311/0xab0 net/mac80211/scan.c:226
ieee80211_rx_bss_info net/mac80211/ibss.c:1099 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1578 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1898/0x2f40 net/mac80211/ibss.c:1605
ieee80211_iface_process_skb net/mac80211/iface.c:1605 [inline]
ieee80211_iface_work+0xc07/0xf00 net/mac80211/iface.c:1659
cfg80211_wiphy_work+0x255/0x330 net/wireless/core.c:437
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>

Tested on:

commit: cc8ed4d0 Merge tag 'drm-fixes-2024-06-01' of https://g..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1096541c980000
kernel config: https://syzkaller.appspot.com/x/.config?x=238430243a58f702
dashboard link: https://syzkaller.appspot.com/bug?extid=54594368fbd5a4f1754a
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=16007026980000

Next message: Theodore Ts'o: "Re: [LSF/MM/BPF TOPIC] untorn buffered writes"
Previous message: joswang: "[PATCH 2/2] usb: dwc3: core: Workaround for CSR read timeout"
In reply to: Hillf Danton: "Re: [syzbot] [mm?] INFO: rcu detected stall in kcompactd (2)"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]