rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10446/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=27625, q=464 ncpus=2)
task:syz.4.1299      state:R  running task     stack:22840 pid:10446 tgid:10440 ppid:9606   task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x1315/0x2390
Code: 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 <4c> 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8
RSP: 0018:ffffc900063fe8b8 EFLAGS: 00000246
RAX: fffffffff886c697 RBX: ffffffff90079d5c RCX: dffffc0000000000
RDX: ffffffff90079d54 RSI: ffffffff90abadfc RDI: ffffffff8be34220
RBP: ffffffff90079d54 R08: 0000000000000003 R09: ffffffff8172d195
R10: ffffc900063fe9d8 R11: ffffffff81ac4d00 R12: ffffffff888e6364
R13: ffffffff90079d54 R14: ffffc900063fe988 R15: ffffffff90079d58
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 ib_cache_setup_one+0x177/0x5e0
 ib_register_device+0xf63/0x1380
 siw_newlink+0x90a/0xd70
 nldev_newlink+0x4a5/0x5a0
 rdma_nl_rcv+0x6ae/0x980
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbd898ec29
RSP: 002b:00007fdbd97d2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdbd8bd6090 RCX: 00007fdbd898ec29
RDX: 0000000020000800 RSI: 00002000000000c0 RDI: 000000000000000d
RBP: 00007fdbd8a11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbd8bd6128 R14: 00007fdbd8bd6090 R15: 00007ffc4561ad48
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g27625 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=13392
rcu: rcu_preempt kthread starved for 10502 jiffies! g27625 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26416 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10453 Comm: syz.3.1302 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0x26a/0xd20
Code: 89 fe 48 8b 3c 24 48 83 7c 24 68 00 0f 85 d5 fe ff ff 44 8b 84 24 80 00 00 00 4c 8b 4c 24 70 4c 8d bf f0 0a 00 00 41 83 fd 31 <48> 89 74 24 20 0f 83 5e 0a 00 00 4c 89 6c 24 28 4a 8d 04 ad 00 00
RSP: 0018:ffffc90000007750 EFLAGS: 00000087
RAX: 0000000000000a0f RBX: ffff88804b027a98 RCX: ffffffff9349a310
RDX: 0000000000000002 RSI: 0000000000000067 RDI: ffff8881066e0000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000000 R15: ffff8881066e0af0
FS:  00007f287c6cf6c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f287c6adfc8 CR3: 00000000457c8000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0xaf5/0x2390
Code: 00 00 00 fc ff df 80 7c 05 00 00 74 08 4c 89 ff e8 20 d8 b0 00 4c 89 7c 24 60 48 89 5c 24 78 4d 8b 7e 08 49 8d 5e 10 49 89 dd <49> c1 ed 03 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 74 08
RSP: 0018:ffffc90003faf638 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90003faf718 RCX: ffffffff8fbfd138
RDX: ffffffff903ffbcc RSI: 0000000000000002 RDI: ffffffff8be34220
RBP: 1ffff920007f5ee2 R08: 0000000000000009 R09: ffffffff8172d195
R10: ffffc90003faf758 R11: ffffffff81ac4d00 R12: ffffc90003fafb08
R13: ffffc90003faf718 R14: ffffc90003faf708 R15: ffffc90003fa8000
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 tomoyo_encode+0x28b/0x550
 tomoyo_realpath_from_path+0x58d/0x5d0
 tomoyo_path_number_perm+0x1e8/0x5a0
 security_file_ioctl+0xcb/0x2d0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f287b78ec29
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f287c6cf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f287b9d5fa0 RCX: 00007f287b78ec29
RDX: 0000000000000005 RSI: 0000000000002402 RDI: 0000000000000005
RBP: 00007f287b811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f287b9d6038 R14: 00007f287b9d5fa0 R15: 00007fffe7530f08
 </TASK>
