rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P3640/1:b..l P11957/1:b..l
(detected by 0, t=10503 jiffies, g=428625, q=1766)
task:syz-executor.0 state:R running task stack:23920 pid:11957 ppid: 1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4986 [inline]
__schedule+0xab2/0x4d90 kernel/sched/core.c:6296
preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6462
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
__raw_read_unlock include/linux/rwlock_api_smp.h:233 [inline]
_raw_read_unlock+0x36/0x40 kernel/locking/spinlock.c:260
zap_pid_ns_processes+0x271/0x660 kernel/pid_namespace.c:207
find_child_reaper kernel/exit.c:548 [inline]
forget_original_parent kernel/exit.c:637 [inline]
exit_notify kernel/exit.c:674 [inline]
do_exit+0x2504/0x2c20 kernel/exit.c:852
do_group_exit+0x125/0x310 kernel/exit.c:929
get_signal+0x34c/0x28b0 kernel/signal.c:2859
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe949532ca7
RSP: 002b:00007ffd1d8f3718 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: 0000000000000030 RBX: 00005555570d3810 RCX: 00007fe949532ca7
RDX: 0000000000008000 RSI: 00005555570d3840 RDI: 0000000000000003
RBP: 00005555570d3840 R08: 0000000000000030 R09: 00007fe9495f3640
R10: 0000000000000231 R11: 0000000000000293 R12: ffffffffffffffbc
R13: 00005555570d3814 R14: 0000000000000016 R15: 00007ffd1d8f4910
task:syz-executor.3 state:R running task stack:23320 pid: 3640 ppid: 1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4986 [inline]
__schedule+0xab2/0x4d90 kernel/sched/core.c:6296
preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6462
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
__raw_read_unlock include/linux/rwlock_api_smp.h:233 [inline]
_raw_read_unlock+0x36/0x40 kernel/locking/spinlock.c:260
zap_pid_ns_processes+0x271/0x660 kernel/pid_namespace.c:207
find_child_reaper kernel/exit.c:548 [inline]
forget_original_parent kernel/exit.c:637 [inline]
exit_notify kernel/exit.c:674 [inline]
do_exit+0x2504/0x2c20 kernel/exit.c:852
do_group_exit+0x125/0x310 kernel/exit.c:929
get_signal+0x34c/0x28b0 kernel/signal.c:2859
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6927678337
RSP: 002b:00007ffdc0b0c710 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000000000003279 RCX: 00007f6927678337
RDX: 0000000040000000 RSI: 00007ffdc0b0c79c RDI: 00000000ffffffff
RBP: 00007ffdc0b0c79c R08: 0000000000000000 R09: 00007f692775f640
R10: 0000000000000000 R11: 0000000000000293 R12: 0000555555a5b810
R13: 0000555555a5b86b R14: 0000000000000001 R15: 00007ffdc0b0c800
rcu: rcu_preempt kthread starved for 10462 jiffies! g428625 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:28336 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4986 [inline]
__schedule+0xab2/0x4d90 kernel/sched/core.c:6296
schedule+0xd2/0x260 kernel/sched/core.c:6369
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
kthread+0x405/0x4f0 kernel/kthread.c:345
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 0
CPU: 0 PID: 26185 Comm: syz-executor.3 Not tainted 5.16.0-rc4-next-20211210-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:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
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+0x1fb/0x200 kernel/rcu/tree_stall.h:458
print_other_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:706 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq+0x2125/0x2200 kernel/rcu/tree.c:2620
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:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x6b/0x70 kernel/kcov.c:289
Code: 00 00 00 48 39 fe 72 22 44 89 c6 48 83 c2 01 48 89 4c 38 f0 48 c7 44 38 e0 05 00 00 00 48 89 74 38 e8 4e 89 54 c8 20 48 89 10 0f 1f 40 00 49 89 f8 bf 03 00 00 00 4c 8b 14 24 48 89 f1 65 48
RSP: 0018:ffffc90000007ce8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000101 RCX: 0000000000000101
RDX: 0000000000000000 RSI: ffff88807c3a9d40 RDI: 0000000000000003
RBP: ffff8880b9c369c0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff83e4ca7d R11: 0000000000000000 R12: 0000000095ee32d1
R13: 1ffff92000000fa8 R14: ffffffff8755ca90 R15: 0000000000000000
prandom_u32+0x1ed/0x470 lib/random32.c:391
mrp_join_timer_arm+0x21/0x80 net/802/mrp.c:595
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:deref_stack_reg+0x20/0x150 arch/x86/kernel/unwind_orc.c:351
Code: 8e 00 48 8b 0c 24 eb 9d 66 90 48 b8 00 00 00 00 00 fc ff df 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 48 89 fa 48 c1 ea 03 <48> 83 ec 08 0f b6 04 02 84 c0 74 08 3c 03 0f 8e d7 00 00 00 41 8b
RSP: 0018:ffffc900049df208 EFLAGS: 00000a02
RAX: dffffc0000000000 RBX: ffffc900049df348 RCX: 0000000000000000
RDX: 1ffff9200093be61 RSI: ffffc900049dfee8 RDI: ffffc900049df308
RBP: ffffc900049dfee8 R08: ffffffff8e1afbd8 R09: 0000000000000001
R10: fffff5200093be6c R11: 000000000008808a R12: ffffc900049df308
R13: ffffc900049df33d R14: ffffc900049df308 R15: ffffc900049df33c
unwind_next_frame+0x13f9/0x1ce0 arch/x86/kernel/unwind_orc.c:600
arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:236 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
slab_free mm/slub.c:3510 [inline]
kfree+0xd0/0x4b0 mm/slub.c:4561
ext4_ext_map_blocks+0xa15/0x5fd0 fs/ext4/extents.c:4379
ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637
ext4_getblk+0x144/0x6b0 fs/ext4/inode.c:847
ext4_bread+0x2a/0x1c0 fs/ext4/inode.c:900
ext4_append+0x177/0x3a0 fs/ext4/namei.c:67
ext4_init_new_dir+0x33f/0x5e0 fs/ext4/namei.c:2893
ext4_mkdir+0x3cf/0xb20 fs/ext4/namei.c:2939
vfs_mkdir+0x1c3/0x3b0 fs/namei.c:3933
do_mkdirat+0x285/0x300 fs/namei.c:3959
__do_sys_mkdir fs/namei.c:3979 [inline]
__se_sys_mkdir fs/namei.c:3977 [inline]
__x64_sys_mkdir+0xf2/0x140 fs/namei.c:3977
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: 0033:0x7f6927679e99
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:00007f6925fef168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f692778cf60 RCX: 00007f6927679e99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000400
RBP: 00007f69276d4031 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdc0b0c4df R14: 00007f6925fef300 R15: 0000000000022000
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 00 00 add %al,(%rax)
2: 48 39 fe cmp %rdi,%rsi
5: 72 22 jb 0x29
7: 44 89 c6 mov %r8d,%esi
a: 48 83 c2 01 add $0x1,%rdx
e: 48 89 4c 38 f0 mov %rcx,-0x10(%rax,%rdi,1)
13: 48 c7 44 38 e0 05 00 movq $0x5,-0x20(%rax,%rdi,1)
1a: 00 00
1c: 48 89 74 38 e8 mov %rsi,-0x18(%rax,%rdi,1)
21: 4e 89 54 c8 20 mov %r10,0x20(%rax,%r9,8)
26: 48 89 10 mov %rdx,(%rax)
* 29: c3 retq <-- trapping instruction
2a: 0f 1f 40 00 nopl 0x0(%rax)
2e: 49 89 f8 mov %rdi,%r8
31: bf 03 00 00 00 mov $0x3,%edi
36: 4c 8b 14 24 mov (%rsp),%r10
3a: 48 89 f1 mov %rsi,%rcx
3d: 65 gs
3e: 48 rex.W