syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2635/1:b..l P2632/3:b..l P15883/1:b..l P2633/1:b..l P2600/1:b..l P2578/1:b..l
rcu: 	(detected by 0, t=10504 jiffies, g=265953, q=1804 ncpus=2)
task:syz.4.9516      state:R  running task     stack:25568 pid:2578  tgid:2575  ppid:1796   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x1568/0x5260 kernel/sched/core.c:6902
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7229
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 31 d5 fa 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 ab e2 54 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 90 b9 fd 09 cc 48 8d 3d f8 de 52
RSP: 0018:ffffc90004a6ea98 EFLAGS: 00000282
RAX: 7535c8ea418d0c00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005c512dbc RSI: ffffffff8df40ba9 RDI: ffffffff8c076800
RBP: ffffffff8175b355 R08: ffffffff8175b355 R09: ffffffff8e55dd60
R10: ffffc90004a6ebf8 R11: ffffffff81af9120 R12: 0000000000000002
R13: ffffffff8e55dd60 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:165
 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:341
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884
 prep_new_page mm/page_alloc.c:1892 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3945
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 folio_alloc_mpol_noprof mm/mempolicy.c:2505 [inline]
 vma_alloc_folio_noprof+0xea/0x210 mm/mempolicy.c:2540
 folio_prealloc mm/memory.c:-1 [inline]
 wp_page_copy mm/memory.c:3722 [inline]
 do_wp_page+0x127b/0x5990 mm/memory.c:4183
 handle_pte_fault mm/memory.c:6292 [inline]
 __handle_mm_fault mm/memory.c:6414 [inline]
 handle_mm_fault+0x1520/0x32a0 mm/memory.c:6583
 do_user_addr_fault+0x75b/0x1360 arch/x86/mm/fault.c:1385
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:__put_user_nocheck_4+0x3/0x10 arch/x86/lib/putuser.S:104
Code: d9 0f 01 cb 89 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <89> 01 31 c9 0f 01 ca e9 d1 75 03 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90004a6f8b8 EFLAGS: 00050202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000200000346030
RDX: ffff888067bd1e40 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90004a6fa30 R08: ffffc90004a6f687 R09: 1ffff9200094ded0
R10: dffffc0000000000 R11: fffff5200094ded1 R12: 1ffff9200094df24
R13: 0000000000000002 R14: 0000200000346000 R15: dffffc0000000000
 ____sys_recvmsg+0x2be/0x4a0 net/socket.c:2825
 ___sys_recvmsg+0x215/0x590 net/socket.c:2854
 do_recvmmsg+0x334/0x800 net/socket.c:2949
 __sys_recvmmsg net/socket.c:3023 [inline]
 __do_sys_recvmmsg net/socket.c:3046 [inline]
 __se_sys_recvmmsg net/socket.c:3039 [inline]
 __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3039
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f777639bf79
RSP: 002b:00007f7777239028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f7776616090 RCX: 00007f777639bf79
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f77764327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7776616128 R14: 00007f7776616090 R15: 00007f777673fa48
 </TASK>
task:syz.3.9522      state:R  running task     stack:26184 pid:2600  tgid:2595  ppid:32494  task_flags:0x40054c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x1568/0x5260 kernel/sched/core.c:6902
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7086
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:389 [inline]
 zap_pte_range mm/memory.c:1888 [inline]
 zap_pmd_range mm/memory.c:1950 [inline]
 zap_pud_range mm/memory.c:1978 [inline]
 zap_p4d_range mm/memory.c:1999 [inline]
 unmap_page_range+0x38fd/0x4030 mm/memory.c:2020
 unmap_single_vma mm/memory.c:2062 [inline]
 unmap_vmas+0x3c0/0x5c0 mm/memory.c:2104
 exit_mmap+0x251/0xb30 mm/mmap.c:1277
 __mmput+0x118/0x430 kernel/fork.c:1174
 exit_mm+0x168/0x220 kernel/exit.c:581
 do_exit+0x62e/0x2310 kernel/exit.c:959
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112
 get_signal+0x1284/0x1330 kernel/signal.c:3034
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff6cd39bf79
RSP: 002b:00007ff6ce1da0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007ff6cd616188 RCX: 00007ff6cd39bf79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff6cd616188
RBP: 00007ff6cd616180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff6cd616218 R14: 00007ff6cd73f960 R15: 00007ff6cd73fa48
 </TASK>
task:modprobe        state:R  running task     stack:25240 pid:2633  tgid:2633  ppid:12     task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x1568/0x5260 kernel/sched/core.c:6902
 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7179
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:753
 rcu_read_lock include/linux/rcupdate.h:851 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
 unwind_next_frame+0xd4/0x23c0 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x370/0x6e0 mm/slub.c:5270
 vm_area_alloc+0x24/0x140 mm/vma_init.c:32
 __mmap_new_vma mm/vma.c:2510 [inline]
 __mmap_region mm/vma.c:2752 [inline]
 mmap_region+0xf85/0x1f40 mm/vma.c:2830
 do_mmap+0xc39/0x10c0 mm/mmap.c:558
 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581
 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:604
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd21d2cc242
RSP: 002b:00007ffd551a2878 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fd21d1ee000 RCX: 00007fd21d2cc242
RDX: 0000000000000005 RSI: 0000000000086000 RDI: 00007fd21d1ee000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000010000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd551a28c8
R13: 00007fd21d2a00c0 R14: 00007ffd551a2c80 R15: 00000fffaaa34512
 </TASK>
task:kworker/1:5     state:R  running task     stack:21496 pid:15883 tgid:15883 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x1568/0x5260 kernel/sched/core.c:6902
 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7179
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:753
 rcu_read_lock include/linux/rcupdate.h:851 [inline]
 gc_worker+0x29e/0x1290 net/netfilter/nf_conntrack_core.c:1546
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
task:modprobe        state:R  running task     stack:24088 pid:2632  tgid:2632  ppid:1153   task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x1568/0x5260 kernel/sched/core.c:6902
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7086
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:389 [inline]
 filemap_map_pages+0x1952/0x2000 mm/filemap.c:3931
 do_fault_around mm/memory.c:5716 [inline]
 do_read_fault mm/memory.c:5749 [inline]
 do_fault mm/memory.c:5892 [inline]
 do_pte_missing+0x2036/0x37a0 mm/memory.c:4404
 handle_pte_fault mm/memory.c:6276 [inline]
 __handle_mm_fault mm/memory.c:6414 [inline]
 handle_mm_fault+0x1b8c/0x32a0 mm/memory.c:6583
 do_user_addr_fault+0xa73/0x1360 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f394b9278f4
RSP: 002b:00007ffe9eb5c618 EFLAGS: 00010283
RAX: 00007f394b5ae190 RBX: 00007f394b5ae190 RCX: 000000000000000a
RDX: 00007f394b60d878 RSI: 00007f394b61a6b0 RDI: ffff80c6b49f2794
RBP: 00007ffe9eb5c770 R08: 0000000000000030 R09: 00000000effffef5
R10: 0000000070000029 R11: 00007ffe9eb5c858 R12: 0000000000000000
R13: 00007f394b61a6b0 R14: 00007ffe9eb5c810 R15: 00007f394b60f018
 </TASK>
task:modprobe        state:R  running task     stack:23512 pid:2635  tgid:2635  ppid:31745  task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x1568/0x5260 kernel/sched/core.c:6902
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7229
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0xc8d/0x23c0 arch/x86/kernel/unwind_orc.c:596
Code: 15 00 00 48 89 d8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 b0 15 00 00 48 0f bf 02 49 01 c4 48 8d 5e 01 48 8b 44 24 40 0f b6 04 28 <84> c0 0f 85 68 11 00 00 49 89 df 49 c1 ef 03 41 0f b6 04 2f 84 c0
RSP: 0018:ffffc9000398f098 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffffffff9090576d RCX: ffffffff9010a2f8
RDX: ffffffff90905768 RSI: ffffffff9090576c RDI: ffffffff8c0767a0
RBP: dffffc0000000000 R08: 0000000000000003 R09: ffffffff8e55dd60
R10: ffffc9000398f1b8 R11: ffffffff81af9120 R12: ffffc9000398fc00
R13: ffffc9000398f1b8 R14: ffffc9000398f168 R15: ffffc9000398f1a0
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x3d1/0x6e0 mm/slub.c:5780
 kmalloc_noprof include/linux/slab.h:958 [inline]
 slab_free_hook mm/slub.c:2492 [inline]
 slab_free mm/slub.c:6674 [inline]
 kmem_cache_free+0x169/0x610 mm/slub.c:6789
 remove_vma mm/vma.c:467 [inline]
 vms_complete_munmap_vmas+0x625/0x890 mm/vma.c:1336
 __mmap_complete+0x7b/0x610 mm/vma.c:2581
 __mmap_region mm/vma.c:2761 [inline]
 mmap_region+0x141b/0x1f40 mm/vma.c:2830
 do_mmap+0xc39/0x10c0 mm/mmap.c:558
 vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581
 ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:604
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4db19a5242
RSP: 002b:00007ffc51322d28 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f4db16c3000 RCX: 00007f4db19a5242
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007f4db16c3000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000004000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc51322db0
R13: 00007f4db197a050 R14: 00007ffc51323160 R15: 00000fff8a2645a8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 210 jiffies! g265953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=139249
rcu: rcu_preempt kthread starved for 213 jiffies! g265953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27624 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x1568/0x5260 kernel/sched/core.c:6902
 __schedule_loop kernel/sched/core.c:6984 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:6999
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 24 5d 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 28 0e 00 fb f4 <e9> 7c e8 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e207dc0 EFLAGS: 00000246
RAX: 00000000027597a5 RBX: ffffffff819986ad RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8dcd29cf RDI: ffffffff8c076800
RBP: ffffffff8e207eb0 R08: ffff8880b863375b R09: 1ffff110170c66eb
R10: dffffc0000000000 R11: ffffed10170c66ec R12: ffffffff8ff01270
R13: 1ffffffff1c529d8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881256ca000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5c8a7c048 CR3: 000000007f5b8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 00000000000f007a DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:766 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1bd/0x500 kernel/sched/idle.c:332
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
 rest_init+0x2de/0x300 init/main.c:757
 start_kernel+0x380/0x3d0 init/main.c:1206
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x147
 </TASK>