rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=5dac/1/0x4000000000000000 softirq=16803/16804 fqs=0
rcu: 	(detected by 1, t=10505 jiffies, g=11709, q=593 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6636 Comm: syz.3.192 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:hrtimer_try_to_cancel+0x218/0x420
Code: 24 10 42 80 3c 30 00 74 08 4c 89 e7 e8 61 68 77 00 4d 8b 2c 24 49 81 fd c0 0d 36 8e 74 66 4c 89 eb 48 c1 eb 03 42 80 3c 33 00 <74> 08 4c 89 ef e8 3e 68 77 00 49 8b 7d 00 e8 e5 b4 d2 09 49 89 c7
RSP: 0018:ffffc90000007928 EFLAGS: 00000046
RAX: 1ffff11005e79f0b RBX: 1ffff11009604f68 RCX: ffff888022618000
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000006e836 R08: ffff88804b027ac3 R09: 1ffff11009604f58
R10: dffffc0000000000 R11: ffffed1009604f59 R12: ffff88802f3cf858
R13: ffff88804b027b40 R14: dffffc0000000000 R15: ffff88804b027b40
FS:  00007f170ea856c0(0000) GS:ffff8880b8403000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d81bff8 CR3: 000000010a61e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3b8/0x500
 __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:tomoyo_socket_sendmsg_permission+0x253/0x300
Code: 89 e0 48 83 c4 50 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 9c d1 3c fd e9 9d fe ff ff e8 92 d1 3c fd e9 93 fe ff ff <e8> 88 d1 3c fd e9 86 fe ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f
RSP: 0018:ffffc900029bfa68 EFLAGS: 00000216
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffffffff84838329 RSI: ffffffff8ea51a40 RDI: 0000000000000010
RBP: ffffc900029bfba0 R08: ffff888022618000 R09: 0000000000000003
R10: 000000000000000a R11: 0000000000000002 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff8880287e7000 R15: ffff8880119cc200
 security_socket_sendmsg+0x9b/0x2b0
 __sock_sendmsg+0x49/0x270
 sock_write_iter+0x279/0x360
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f170db8ec29
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:00007f170ea85038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f170ddd5fa0 RCX: 00007f170db8ec29
RDX: 000000000000fe33 RSI: 0000000000000000 RDI: 0000000000000009
RBP: 00007f170dc11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f170ddd6038 R14: 00007f170ddd5fa0 R15: 00007ffc601cab18
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g11709 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:26696 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
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+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 6632 Comm: syz.4.191 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:__sanitizer_cov_trace_pc+0x37/0x70
Code: 08 d0 c1 92 65 8b 15 c8 79 01 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 7c 16 00 00 00 74 2c 8b 91 58 16 00 00 <83> fa 02 75 21 48 8b 91 60 16 00 00 48 8b 32 48 8d 7e 01 8b 89 5c
RSP: 0018:ffffc90002aaf338 EFLAGS: 00000246
RAX: ffffffff81b4e79b RBX: 1ffff11009608441 RCX: ffff88810830d700
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002aaf4c0 R08: ffffffff8fc34277 R09: 1ffffffff1f8684e
R10: dffffc0000000000 R11: fffffbfff1f8684f R12: ffff88804b042208
R13: dffffc0000000000 R14: ffff88813663b200 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881a3a03000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32d05ff8 CR3: 000000000e138000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 smp_call_function_many_cond+0xd4b/0x12d0
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 tlb_flush_mmu+0x1a7/0x680
 tlb_finish_mmu+0xc3/0x1d0
 free_ldt_pgtables+0x17b/0x320
 exit_mmap+0x174/0xb40
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1285/0x1340
 arch_do_signal_or_restart+0xa0/0x790
 exit_to_user_mode_loop+0x72/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f29a638ec29
Code: Unable to access opcode bytes at 0x7f29a638ebff.
RSP: 002b:00007f29a72200e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f29a65d6098 RCX: 00007f29a638ec29
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f29a65d6098
RBP: 00007f29a65d6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f29a65d6128 R14: 00007ffd52547d30 R15: 00007ffd52547e18
 </TASK>
