rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=e12c/1/0x4000000000000000 softirq=31521/31521 fqs=2
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6951/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=32869, q=300 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6474 Comm: udevd 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_is_held_type+0x9b/0x150
Code: 90 0b 00 00 45 31 ff 49 83 ff 31 73 24 48 89 df 4c 89 f6 e8 f7 01 00 00 85 c0 75 2a 49 ff c7 49 63 85 88 0b 00 00 48 83 c3 28 <49> 39 c7 7c d8 eb 11 48 c7 c7 30 b4 82 8e 4c 89 fe e8 bf 20 47 f9
RSP: 0018:ffffc90000a08ab0 EFLAGS: 00000082
RAX: 0000000000000003 RBX: ffff88810f4d2938 RCX: 0000000080010101
RDX: ffff88810f4d1d80 RSI: ffff8881117582c0 RDI: ffff88810f4d2910
RBP: 00000000ffffffff R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200014114c R12: 0000000000000046
R13: ffff88810f4d1d80 R14: ffff8881117582c0 R15: 0000000000000001
FS:  00007f5cfcf37c80(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffffd6f0fc8 CR3: 00000001bef24000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 advance_sched+0x1c6/0xc20
 __hrtimer_run_queues+0x3c0/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 54 06 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 2f 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 98 5c 92
RSP: 0018:ffffc90000a08e90 EFLAGS: 00000286
RAX: 6253fc563d05fc00 RBX: 0000000000000000 RCX: 0000000080000100
RDX: 000000005a44979c RSI: ffffffff8e21bb17 RDI: ffffffff8c28b0e0
RBP: ffffffff89809806 R08: ffffffff89809806 R09: ffffffff8e95cda0
R10: dffffc0000000000 R11: fffffbfff20614df R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000246
 net_tx_action+0x5d7/0xc30
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x6e/0x350
Code: 11 83 f8 08 0f 83 83 01 00 00 89 c0 48 0f a3 05 58 08 8f 0e 73 0d e8 a1 28 09 00 84 c0 0f 84 ca 01 00 00 83 3d 12 3b 8f 0e 00 <0f> 84 d3 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 0c 35 8f 00
RSP: 0018:ffffc9000990f720 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8c28b0c0 RDI: ffffffff8c28b080
RBP: ffffffff82700a3c R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed102c1d1569 R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000000
 kernfs_root+0x38/0x230
 kernfs_dop_revalidate+0x36d/0x650
 lookup_fast+0x253/0x5b0
 link_path_walk+0x720/0x18d0
 path_lookupat+0xe4/0x8c0
 filename_lookup+0x256/0x5d0
 vfs_statx+0xfc/0x200
 vfs_fstatat+0x11b/0x170
 __x64_sys_newfstatat+0x151/0x200
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5cfcb165f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffffd6ffd98 EFLAGS: 00000206 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000559b914a1780 RCX: 00007f5cfcb165f4
RDX: 00007ffffd6ffda8 RSI: 00007ffffd6ffe38 RDI: 00000000ffffff9c
RBP: 0000559b8ce9e77b R08: 0000000000000400 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 0000000000000000
R13: 0000559b914a1870 R14: 00007ffffd6ffe38 R15: 0000000000000000
 </TASK>
task:syz-executor    state:R  running task     stack:22112 pid:6951  tgid:6951  ppid:6946   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 54 06 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 2f 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 98 5c 92
RSP: 0018:ffffc9000bcef578 EFLAGS: 00000286
RAX: a08b9847a4986300 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8e21bb17 RDI: ffffffff8c28b0e0
RBP: ffffffff8176e256 R08: ffffffff8176e256 R09: ffffffff8e95cda0
R10: ffffc9000bcef6d8 R11: ffffffff81b0d910 R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000246
 unwind_next_frame+0xc3/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 __do_replace+0x83d/0x990
 do_ipt_set_ctl+0xb45/0xe00
 nf_setsockopt+0x26f/0x290
 do_sock_setsockopt+0x17c/0x1b0
 __x64_sys_setsockopt+0x13d/0x1b0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f078959e61a
RSP: 002b:00007ffc88a4ce78 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffc88a4cf00 RCX: 00007f078959e61a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000002d8 R09: ffffffffffff0000
R10: 00007f07897ecb20 R11: 0000000000000206 R12: 00007f07897ecac0
R13: 00007ffc88a4ce9c R14: 0000000000000000 R15: 00007f07897ed180
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g32869 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:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 8323 Comm: syz.2.619 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:smp_call_function_many_cond+0xfe6/0x13d0
Code: 00 00 00 00 00 fc ff df 75 07 e8 a5 f8 0b 00 eb 37 f3 90 43 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 8a f8 0b 00 <eb> e5 44 89 f1 80 e1 07 80 c1 03 38 c1 7c e3 4c 89 f7 e8 43 52 77
RSP: 0018:ffffc90003667560 EFLAGS: 00000246
RAX: ffffffff81b9abb6 RBX: ffff88812103c148 RCX: 0000000000080000
RDX: ffffc90020772000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900036676a0 R08: ffffffff9030a6f7 R09: 1ffffffff20614de
R10: dffffc0000000000 R11: fffffbfff20614df R12: 1ffff110478c8169
R13: dffffc0000000000 R14: ffff88823c640b48 R15: 0000000000000001
FS:  00007fb438f416c0(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559b9150c298 CR3: 000000011631e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x5c3/0x10b0
 tlb_flush_mmu+0x1a0/0xa10
 tlb_finish_mmu+0xf9/0x230
 unmap_region+0x2a5/0x330
 vms_complete_munmap_vmas+0x493/0xc60
 do_vmi_align_munmap+0x3b7/0x4b0
 do_vmi_munmap+0x252/0x2d0
 __vm_munmap+0x22c/0x3d0
 __x64_sys_munmap+0x60/0x70
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb437f9cc07
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb438f40e08 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fb437f9cc07
RDX: 0000000001000000 RSI: 0000000008400000 RDI: 00007fb42dc00000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fb438f40ee0 R14: 00007fb438f40ea0 R15: 00007fb42dc00000
 </TASK>
