rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=652c/1/0x4000000000000000 softirq=31184/31185 fqs=3
rcu: 	(t=10500 jiffies g=23757 q=222 ncpus=2)
rcu: rcu_preempt kthread starved for 10494 jiffies! g23757 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:26536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x16f5/0x4d00
 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: 10496 Comm: syz.2.1911 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e #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:kasan_check_range+0x43/0x2c0
Code: 4c 8d 04 37 49 39 f8 0f 82 82 02 00 00 49 b9 00 00 00 00 00 80 ff ff eb 11 cc cc cc f3 0f 1e fa 49 b9 00 00 00 00 00 00 00 ff <f3> 0f 1e fa 4c 39 cf 0f 82 58 02 00 00 49 89 ff 49 c1 ef 03 49 ba
RSP: 0018:ffffc9000458fba8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff888106a978c0 RCX: ffffffff8b71260c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888106a978c0
RBP: ffffc9000458fcd8 R08: ffff888106a978c4 R09: ffff800000000000
R10: dffffc0000000000 R11: ffffed1020d52f19 R12: 1ffff920008b1f84
R13: 0000000000000001 R14: ffffc9000458fc40 R15: 1ffff11020d52f18
FS:  00007ff403dd56c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff403dd4fc8 CR3: 000000003b5ce000 CR4: 00000000000006f0
DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 native_queued_spin_lock_slowpath+0xbc/0x8e0
 queued_spin_lock_slowpath+0x43/0x50
 do_raw_spin_lock+0x21f/0x290
 alloc_fd+0x62/0x6c0
 __sys_socketpair+0x67/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff405f8e9a9
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:00007ff403dd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007ff4061b6080 RCX: 00007ff405f8e9a9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 00007ff406010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff4061b6080 R15: 00007ffc17d55628
 </TASK>
CPU: 1 UID: 0 PID: 10490 Comm: syz.2.1911 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e #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:unwind_get_return_address+0x4d/0x90
Code: c0 75 4c 83 3b 00 74 3a 48 83 c3 48 49 89 df 49 c1 ef 03 43 80 3c 37 00 74 08 48 89 df e8 fb a2 b0 00 48 8b 3b e8 93 a3 1a 00 <85> c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 e0 a2 b0 00 48 8b 03
RSP: 0018:ffffc900001e07e8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc900001e0850 RCX: 692463e849d50200
RDX: 0000000000000001 RSI: ffffffff8d998836 RDI: ffffffff8952c844
RBP: ffffc900001e0890 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff8881064a8000
R13: ffffffff81a8c254 R14: dffffc0000000000 R15: 1ffff9200003c10a
FS:  00007ff403df66c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001d80 CR3: 000000003b5ce000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0xfc/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 slab_free_after_rcu_debug+0x129/0x2a0
 rcu_core+0xca8/0x1710
 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:check_preemption_disabled+0x12/0x120
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 05 ee 6d 31 07 <48> 89 44 24 08 65 8b 05 f6 6d 31 07 65 8b 0d eb 6d 31 07 f7 c1 ff
RSP: 0018:ffffc9000456f458 EFLAGS: 00000282
RAX: 692463e849d50200 RBX: ffff888106a978c0 RCX: ffff8881064a8000
RDX: 0000000000000000 RSI: ffffffff8be29f20 RDI: ffffffff8be29ee0
RBP: dffffc0000000000 R08: ffff88810019fea7 R09: 1ffff11020033fd4
R10: dffffc0000000000 R11: ffffed1020033fd5 R12: ffff88803b71f188
R13: ffffffff823c46ec R14: ffff888106a978d8 R15: 001fffffffffffff
 rcu_is_watching+0x15/0xb0
 lock_release+0x4b/0x3e0
 _raw_spin_unlock+0x16/0x50
 alloc_fd+0x64c/0x6c0
 receive_fd+0xb0/0x1e0
 scm_detach_fds+0x214/0x6d0
 __scm_recv_common+0x34d/0x610
 scm_recv_unix+0xab/0x360
 __unix_dgram_recvmsg+0xa0e/0xd80
 sock_recvmsg+0x22c/0x270
 ____sys_recvmsg+0x1c9/0x460
 ___sys_recvmsg+0x1b5/0x510
 __x64_sys_recvmsg+0x198/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff405f8e9a9
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:00007ff403df6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007ff4061b5fa0 RCX: 00007ff405f8e9a9
RDX: 0000000040002000 RSI: 0000200000000000 RDI: 0000000000000010
RBP: 00007ff406010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff4061b5fa0 R15: 00007ffc17d55628
 </TASK>
sched: DL replenish lagged too much
