rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6231/1:b..l P27/1:b..l P5855/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=9037, q=1044 ncpus=2)
task:syz-executor    state:R  running task     stack:21064 pid:5855  tgid:5855  ppid:5845   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:__rcu_read_lock+0x32/0x60
Code: 1c 25 08 40 a0 92 48 81 c3 44 04 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 18 ff 03 8b 03 <3d> 00 00 00 40 7d 07 5b e9 01 05 d5 09 cc 90 0f 0b 90 eb f3 89 d9
RSP: 0018:ffffc90003f8ef28 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff888106808444 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: ffffffff847e784b RDI: ffffc90003f8f008
RBP: dffffc0000000000 R08: ffffc90003f8f0d0 R09: 0000000000000008
R10: ffffc90003f8f058 R11: ffffffff81ac3930 R12: 1ffff920007f1e01
R13: ffffc90003f8f040 R14: ffffc90003f8f008 R15: ffffc90003f8f548
 unwind_next_frame+0x9e/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc4/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x224/0x4f0
 tomoyo_encode+0x28b/0x550
 tomoyo_realpath_from_path+0x58d/0x5d0
 tomoyo_check_open_permission+0x1c1/0x3b0
 security_file_open+0xb1/0x270
 do_dentry_open+0x384/0x13f0
 vfs_open+0x3b/0x340
 path_openat+0x2ee5/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f772d58e4e1
RSP: 002b:00007ffe635ba290 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000000006a RCX: 00007f772d58e4e1
RDX: 0000000000090800 RSI: 00007f772d61210e RDI: 00000000ffffff9c
RBP: 00007ffe635ba33c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000020
R13: 0000000000000000 R14: 00000000000114da R15: 00007ffe635ba390
 </TASK>
task:kworker/u10:0   state:R  running task     stack:22560 pid:27    tgid:27    ppid:2      task_flags:0x4248060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 4b e3 02 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000060e078 EFLAGS: 00000206
RAX: 8248218173458600 RBX: 0000000000000000 RCX: 8248218173458600
RDX: 0000000000000000 RSI: ffffffff8dba5ce5 RDI: ffffffff8be33300
RBP: ffffffff8172c195 R08: 0000000000000000 R09: ffffffff8172c195
R10: ffffc9000060e238 R11: ffffffff81ac3930 R12: 0000000000000002
R13: ffffffff8e139ea0 R14: 0000000000000000 R15: 0000000000000246
 unwind_next_frame+0xc2/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc4/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x224/0x4f0
 ext4_find_extent+0x207/0xcc0
 ext4_ext_map_blocks+0x288/0x6ac0
 ext4_map_blocks+0x860/0x1740
 ext4_do_writepages+0x1f88/0x4610
 ext4_writepages+0x205/0x350
 do_writepages+0x32e/0x550
 __writeback_single_inode+0x145/0xff0
 writeback_sb_inodes+0x6c7/0x1010
 __writeback_inodes_wb+0x111/0x240
 wb_writeback+0x44f/0xaf0
 wb_workfn+0xaef/0xef0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
task:syz.1.89        state:R  running task     stack:24456 pid:6231  tgid:6218  ppid:5848   task_flags:0x400140 flags:0x00004006
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+0x1e5/0x2390
Code: a2 01 00 00 49 81 fc 00 00 00 81 0f 92 c0 49 81 fc 6c 03 7d 8b 0f 93 c1 08 c1 0f 85 e8 00 00 00 48 c7 c0 00 00 00 81 4d 89 e7 <49> 29 c7 49 c1 ef 08 8b 15 1e 2f 4b 0c 8d 42 ff 44 39 f8 0f 86 65
RSP: 0018:ffffc90006937558 EFLAGS: 00000246
RAX: ffffffff81000000 RBX: 0000000000000001 RCX: 5c5b96bda9665900
RDX: ffffffff8b8840a0 RSI: ffffffff8be332e0 RDI: ffffffff8be332a0
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8172c195
R10: ffffc90006937678 R11: ffffffff81ac3930 R12: ffffffff8218472d
R13: ffffc90006937678 R14: ffffc90006937628 R15: ffffffff8218472d
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 __free_slab+0xb0/0x1a0
 __slab_free+0x303/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x1be/0x3d0
 ref_tracker_alloc+0x133/0x460
 sk_alloc+0x1b1/0x370
 __netlink_create+0x65/0x260
 netlink_create+0x3ca/0x590
 __sock_create+0x4b3/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f53f8ebe9
RSP: 002b:00007f4f54d25038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f4f541c6090 RCX: 00007f4f53f8ebe9
RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007f4f54011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4f541c6128 R14: 00007f4f541c6090 R15: 00007ffcc47d9f68
 </TASK>
rcu: rcu_preempt kthread starved for 4962 jiffies! g9037 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:26792 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+0x3fc/0x770
 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: 6219 Comm: syz.1.89 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:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc f3 0f 1e fa 89 f6 31 d2 e9 92 62 8e 03 66
RSP: 0018:ffffc90000007048 EFLAGS: 00000046
RAX: 0000000000000101 RBX: ffff88804b023900 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000838
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ae033e
R10: 0000000000000003 R11: ffffffff81703490 R12: 0000000010005a98
R13: dffffc0000000000 R14: 0000000000000101 R15: 0000000000000020
FS:  00007f4f54d466c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f9c9577de8 CR3: 0000000023ace000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x1cf/0x360
 hrtimer_interrupt+0x620/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:stack_trace_consume_entry+0xf3/0x280
Code: 8b 74 24 08 48 8b 1f 45 8d 79 01 0f b6 44 15 00 84 c0 0f 85 3a 01 00 00 45 89 38 4e 8d 3c cb 4c 89 f8 48 c1 e8 03 80 3c 10 00 <74> 1a 4c 89 ff 48 89 f3 49 89 d4 4c 89 c5 e8 da e5 76 00 49 89 e8
RSP: 0018:ffffc900000072b8 EFLAGS: 00000246
RAX: 1ffff92000000e9f RBX: ffffc90000007440 RCX: 38f0311c779d5f00
RDX: dffffc0000000000 RSI: ffffffff81a71794 RDI: ffffc900000073c0
RBP: 1ffff92000000e7a R08: ffffc900000073d0 R09: 0000000000000017
R10: ffffc90000007358 R11: ffffffff81ac3930 R12: 0000000000000000
R13: 1ffff92000000e79 R14: ffffc900000073c8 R15: ffffc900000074f8
 arch_stack_walk+0x110/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 skb_clone+0x212/0x3a0
 packet_rcv_spkt+0x139/0x5c0
 __netif_receive_skb_core+0x3107/0x4020
 __netif_receive_skb+0x72/0x380
 process_backlog+0x60e/0x14f0
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 2f b7 ea 09 e8 5a 3f 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900066f7018 EFLAGS: 00000286
RAX: 38f0311c779d5f00 RBX: 0000000000000000 RCX: 38f0311c779d5f00
RDX: 0000000000000000 RSI: ffffffff8d9b6a5f RDI: ffffffff8be33300
RBP: ffffc900066f7070 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffff88801f239cc0
R13: dffffc0000000000 R14: ffff88801c2fb980 R15: ffff88804b03ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_report_qs_rsp+0xd9/0x1b0
Code: 05 bc 6e 6c 0c 65 48 8b 0c 25 08 40 a0 92 48 39 c8 75 0f 65 8b 0d c7 b7 f8 10 f7 c1 00 01 0f 00 74 15 66 83 3d ef 6e 6c 0c 00 <0f> 94 c1 48 85 c0 0f 94 c0 08 c8 74 09 5b 41 5e e9 52 93 d4 09 cc
RSP: 0018:ffffc900066f7408 EFLAGS: 00000202
RAX: ffff88801c2ed640 RBX: 0000000000000246 RCX: ffff88801f239cc0
RDX: 0000000000000000 RSI: ffffffff8d9b6a5f RDI: 00000000ffffffff
RBP: ffffc900066f7570 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffffffff8e13f201
R13: ffffffff8e13f1c0 R14: dffffc0000000000 R15: 0000000000000000
 rcu_preempt_deferred_qs_irqrestore+0xa11/0xce0
 rcu_read_unlock_special+0x475/0x5e0
 __rcu_read_unlock+0x84/0xe0
 sock_wfree+0x1d3/0x7a0
 skb_release_head_state+0x101/0x250
 sk_skb_reason_drop+0xe9/0x170
 pep_sendmsg+0x9c2/0xb10
 pn_socket_sendmsg+0x1c3/0x230
 __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: 0033:0x7f4f53f8ebe9
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:00007f4f54d46038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4f541c5fa0 RCX: 00007f4f53f8ebe9
RDX: 00000000000000c0 RSI: 0000200000000940 RDI: 0000000000000008
RBP: 00007f4f54011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4f541c6038 R14: 00007f4f541c5fa0 R15: 00007ffcc47d9f68
 </TASK>
