rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1):
(detected by 1, t=10502 jiffies, g=563105, q=389)
rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4295290758-4295280260), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10498 jiffies! g563105 f0x0 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:28864 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4681 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5938
schedule+0xd3/0x270 kernel/sched/core.c:6017
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 20469 Comm: syz-executor.2 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1d1/0x1d6 kernel/rcu/tree_stall.h:479
print_other_cpu_stall kernel/rcu/tree_stall.h:584 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq+0x2001/0x20c0 kernel/rcu/tree.c:2641
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:mac80211_hwsim_tx_frame_no_nl.isra.0+0x77b/0x1330 drivers/net/wireless/mac80211_hwsim.c:1527
Code: 00 00 00 c6 84 24 98 00 00 00 00 74 bb e8 6d 2e 43 fc 48 8d bb ac 3c 00 00 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 0f b6 04 28 <38> d0 7f 08 84 c0 0f 85 36 09 00 00 44 0f b6 bb ac 3c 00 00 31 ff
RSP: 0018:ffffc90000dc0ba0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888017c8b2a0 RCX: 0000000000000100
RDX: 0000000000000004 RSI: ffffffff85327a83 RDI: ffff888017c8ef4c
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff85327ab9 R11: 0000000000000000 R12: ffff88809874b500
R13: ffff88802ac434d0 R14: ffff88802ac432a0 R15: 0000000000000000
mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784
mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838
__iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793
ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1601
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6326
Code: 55 53 65 48 8b 1c 25 40 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 02 80 23 f8 e8 1d cc 4f f8 fb bf 01 00 00 00 d2 cd ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 10 6f 23
RSP: 0018:ffffc90001a7f328 EFLAGS: 00000202
RAX: 0000000000003249 RBX: ffff8880616f9c40 RCX: 1ffffffff1fa1c42
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed100c2df388 R08: 0000000000000001 R09: ffffffff8fcd5977
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x31/0x80 kernel/entry/common.c:427
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:xas_start+0x0/0x730 lib/xarray.c:180
Code: ff ff 48 8b 7c 24 18 e8 5e 8e c7 fd e9 3b fa ff ff 48 89 f7 e8 a1 8d c7 fd e9 cf f9 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 <41> 56 41 55 41 54 55 53 48 89 fb e8 70 53 81 fd 4c 8d 6b 18 48 b8
RSP: 0018:ffffc90001a7f3f8 EFLAGS: 00000216
RAX: 0000000000017fa7 RBX: 0000000000000001 RCX: ffffc9000de66000
RDX: 0000000000040000 RSI: ffffffff83f45cc0 RDI: ffffc90001a7f4c0
RBP: ffffc90001a7f4c0 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff819a5f9c R11: 0000000000000000 R12: 00000000000003a0
R13: dffffc0000000000 R14: ffff88801ec2cc40 R15: 0000000000000001
xas_load+0x28/0x140 lib/xarray.c:233
mapping_get_entry mm/filemap.c:1771 [inline]
pagecache_get_page+0x165/0x18d0 mm/filemap.c:1839
find_get_page_flags include/linux/pagemap.h:357 [inline]
__find_get_block_slow fs/buffer.c:202 [inline]
__find_get_block fs/buffer.c:1308 [inline]
__find_get_block+0x4ba/0xdb0 fs/buffer.c:1302
sb_find_get_block include/linux/buffer_head.h:340 [inline]
recently_deleted fs/ext4/ialloc.c:687 [inline]
find_inode_bit+0x230/0x580 fs/ext4/ialloc.c:729
__ext4_new_inode+0xc4d/0x5c40 fs/ext4/ialloc.c:1064
ext4_create+0x2d6/0x4d0 fs/ext4/namei.c:2738
lookup_open.isra.0+0xfe4/0x13d0 fs/namei.c:3228
open_last_lookups fs/namei.c:3298 [inline]
path_openat+0x9b3/0x27f0 fs/namei.c:3504
do_filp_open+0x1aa/0x400 fs/namei.c:3534
do_sys_openat2+0x16d/0x420 fs/open.c:1204
do_sys_open fs/open.c:1220 [inline]
__do_sys_openat fs/open.c:1236 [inline]
__se_sys_openat fs/open.c:1231 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1231
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6e1fa39188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 00000000000026e1 RSI: 0000000020000240 RDI: ffffffffffffff9c
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd08dcb6ef R14: 00007f6e1fa39300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 c6 add %al,%dh
4: 84 24 98 test %ah,(%rax,%rbx,4)
7: 00 00 add %al,(%rax)
9: 00 00 add %al,(%rax)
b: 74 bb je 0xffffffc8
d: e8 6d 2e 43 fc callq 0xfc432e7f
12: 48 8d bb ac 3c 00 00 lea 0x3cac(%rbx),%rdi
19: 48 89 f8 mov %rdi,%rax
1c: 48 89 fa mov %rdi,%rdx
1f: 48 c1 e8 03 shr $0x3,%rax
23: 83 e2 07 and $0x7,%edx
26: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax
* 2a: 38 d0 cmp %dl,%al <-- trapping instruction
2c: 7f 08 jg 0x36
2e: 84 c0 test %al,%al
30: 0f 85 36 09 00 00 jne 0x96c
36: 44 0f b6 bb ac 3c 00 movzbl 0x3cac(%rbx),%r15d
3d: 00
3e: 31 ff xor %edi,%edi