rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1053/1:b..l P5179/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=8637, q=819 ncpus=2)
task:syz.0.7 state:R running task stack:23600 pid:5179 tgid:5179 ppid:5082 flags:0x00004002
Call Trace:
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_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_is_held_type+0x107/0x150 kernel/locking/lockdep.c:5830
Code: 00 00 b8 ff ff ff ff 65 0f c1 05 dc 50 1b 75 83 f8 01 75 2d 9c 58 f6 c4 02 75 43 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 45 31 ed eb
RSP: 0018:ffffc90003cdecd8 EFLAGS: 00000286
RAX: 0000000000000046 RBX: ffff8880177e4758 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8b2cb200 RDI: ffffffff8b8ff900
RBP: ffffffff8dbb18e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: ffff8880177e3c00
R13: 0000000000000001 R14: 00000000ffffffff R15: 0000000000000003
xa_entry include/linux/xarray.h:1220 [inline]
xas_descend lib/xarray.c:207 [inline]
xas_load+0x3a4/0x5b0 lib/xarray.c:245
xa_load+0xf9/0x2c0 lib/xarray.c:1477
page_cache_ra_unbounded+0x194/0x5a0 mm/readahead.c:230
do_page_cache_ra mm/readahead.c:303 [inline]
page_cache_ra_order+0x6e5/0xae0 mm/readahead.c:547
ondemand_readahead+0x520/0x1140 mm/readahead.c:669
page_cache_async_ra mm/readahead.c:718 [inline]
page_cache_async_ra+0x123/0x150 mm/readahead.c:700
do_async_mmap_readahead mm/filemap.c:3203 [inline]
filemap_fault+0xbbf/0x2610 mm/filemap.c:3299
__do_fault+0x10a/0x490 mm/memory.c:4556
do_read_fault mm/memory.c:4920 [inline]
do_fault mm/memory.c:5050 [inline]
do_pte_missing mm/memory.c:3897 [inline]
handle_pte_fault mm/memory.c:5380 [inline]
__handle_mm_fault+0x3a1e/0x5410 mm/memory.c:5523
handle_mm_fault+0x476/0xa00 mm/memory.c:5688
faultin_page mm/gup.c:1290 [inline]
__get_user_pages+0x473/0x1490 mm/gup.c:1589
__get_user_pages_locked mm/gup.c:1857 [inline]
get_dump_page+0xfb/0x220 mm/gup.c:2375
dump_user_range+0x135/0x8a0 fs/coredump.c:952
elf_core_dump+0x27c1/0x3990 fs/binfmt_elf.c:2083
do_coredump+0x2a6b/0x3e70 fs/coredump.c:767
get_signal+0x232c/0x2710 kernel/signal.c:2894
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
irqentry_exit_to_user_mode+0x139/0x280 kernel/entry/common.c:231
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f4559439e77
RSP: 002b:00007f455a259160 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f4559575ae9
RDX: 00007f455a259180 RSI: 00007f455a2592b0 RDI: 000000000000000b
RBP: 00007f45595f6746 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f4559703fa0 R15: 00007ffc4e2a9218
task:kworker/u8:8 state:R running task stack:25504 pid:1053 tgid:1053 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
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 ad 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:ffffc90004897a70 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000912f50 RCX: 00000000afd5f49a
RDX: 0000000000000001 RSI: ffffffff8b2cb200 RDI: ffffffff8b8ff900
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff284cc58
R10: ffffffff942662c7 R11: 0000000000000003 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_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:754 [inline]
batadv_iv_ogm_schedule_buff+0x5ac/0x1500 net/batman-adv/bat_iv_ogm.c:825
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:868 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:861 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x31e/0x8d0 net/batman-adv/bat_iv_ogm.c:1712
process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248
process_scheduled_works kernel/workqueue.c:3329 [inline]
worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409
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
rcu: rcu_preempt kthread starved for 9994 jiffies! g8637 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:28752 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6837
schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
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
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112
sched: RT throttling activated