rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=5a1c/1/0x4000000000000000 softirq=37993/37994 fqs=2
rcu: 	(detected by 1, t=10505 jiffies, g=28253, q=187 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10529 Comm: syz.0.935 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:kasan_check_range+0x0/0x1a0 mm/kasan/generic.c:188
Code: 96 d4 ff ff 89 43 08 5b 5d 41 5c c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 48 85 f6 0f 84 50 01 00 00 48 89 f8 41 54 44 0f b6 c2
RSP: 0018:ffffc90000007d48 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 1ffff92000000fac RCX: ffffffff816b64e9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff905f5c10
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000002 R12: ffff8880b862ca18
R13: ffff8880b862cb00 R14: ffff8880b862ca00 R15: ffffffff8931b920
FS:  00007fb9e0b2c6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb9e0b0af98 CR3: 0000000031190000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:570 [inline]
 cpu_online include/linux/cpumask.h:1117 [inline]
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0xa9/0x6f0 kernel/locking/lockdep.c:5860
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:194
 __run_hrtimer kernel/time/hrtimer.c:1735 [inline]
 __hrtimer_run_queues+0x53d/0xae0 kernel/time/hrtimer.c:1803
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:write_comp_data+0x8b/0x90 kernel/kcov.c:272
Code: 00 00 4a 8d 34 dd 28 00 00 00 48 39 f2 72 1b 48 83 c7 01 48 89 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 <c3> cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc90005b3f3c0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff8b130932
RDX: ffff88807477a440 RSI: 0000000000000001 RDI: 0000000000000005
RBP: ffffffff8ccc5760 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000001
R13: 0000000000000005 R14: 0000000000000004 R15: 0000000000000001
 __sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:351
 ma_slots lib/maple_tree.c:775 [inline]
 mas_validate_limits lib/maple_tree.c:7477 [inline]
 mt_validate+0xb32/0x41b0 lib/maple_tree.c:7605
 validate_mm+0xb1/0x530 mm/vma.c:584
 __split_vma+0xcfe/0x1160 mm/vma.c:481
 vms_gather_munmap_vmas+0x38b/0x1730 mm/vma.c:1288
 __mmap_prepare mm/vma.c:2241 [inline]
 __mmap_region+0x31d/0x2670 mm/vma.c:2443
 mmap_region+0x127/0x320 mm/mmap.c:1347
 do_mmap+0xc00/0xfc0 mm/mmap.c:496
 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:588
 ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:542
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb9dfd7e819
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:00007fb9e0b2c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb9dff35fa0 RCX: 00007fb9dfd7e819
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fb9dfdf175e R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb9dff35fa0 R15: 00007ffea19bef68
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g28253 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:28424 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6848
 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5869 Comm: kworker/1:2 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events fqdir_free_fn
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_single+0x1c7/0x580 kernel/smp.c:679
Code: c0 48 89 de 89 fa c1 e2 10 09 d0 89 44 24 4c e8 af fa ff ff 41 89 c5 0f 1f 44 00 00 e8 52 ed 0b 00 eb 07 e8 4b ed 0b 00 f3 90 <8b> 5c 24 48 31 ff 83 e3 01 89 de e8 79 ef 0b 00 85 db 75 e5 e8 30
RSP: 0018:ffffc900046d7b20 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8182cd97
RDX: ffff888030b1a440 RSI: ffffffff8182cd85 RDI: 0000000000000005
RBP: ffffc900046d7c00 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: 1ffff920008daf68
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880b863fb80
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002057eff8 CR3: 000000002ad02000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 rcu_barrier+0x28d/0x700 kernel/rcu/tree.c:4617
 fqdir_free_fn+0x32/0x130 net/ipv4/inet_fragment.c:167
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>