rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P19558/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=170721, q=2395 ncpus=2)
task:syz.0.3887 state:R running task stack:25576 pid:19558 tgid:19558 ppid:16341 task_flags:0x40004c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x920 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:ptlock_ptr include/linux/mm.h:3840 [inline]
RIP: 0010:pte_lockptr include/linux/mm.h:3864 [inline]
RIP: 0010:pte_offset_map_lock+0x127/0x210 mm/pgtable-generic.c:403
Code: ff e8 ed 81 a3 ff 4d 21 f5 49 c1 ed 06 4d 01 fd 49 83 c5 28 4c 89 e8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 80 3c 30 00 <74> 08 4c 89 ef e8 3f 5c 14 00 4d 8b 6d 00 4c 89 ef e8 e3 b9 c6 09
RSP: 0018:ffffc90004d6f568 EFLAGS: 00000246
RAX: 1ffffd40001a073d RBX: ffff888071df6308 RCX: ffff88807c7b9f40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000340e7067 R08: ffffffff82248c59 R09: 0000000000000000
R10: ffffc90004d6f820 R11: fffff520009adf06 R12: 1ffff1100e3bec61
R13: ffffea0000d039e8 R14: dffffc0000000000 R15: ffffea0000000000
zap_pte_range mm/memory.c:2051 [inline]
zap_pmd_range mm/memory.c:2151 [inline]
zap_pud_range mm/memory.c:2179 [inline]
zap_p4d_range mm/memory.c:2200 [inline]
__zap_vma_range+0x41eb/0x4f80 mm/memory.c:2240
unmap_vmas+0x390/0x550 mm/memory.c:2309
exit_mmap+0x293/0x9f0 mm/mmap.c:1315
__mmput+0x118/0x420 kernel/fork.c:1193
exit_mm+0x18e/0x240 kernel/exit.c:592
do_exit+0x6cd/0x2360 kernel/exit.c:974
do_group_exit+0x22d/0x2f0 kernel/exit.c:1129
__do_sys_exit_group kernel/exit.c:1140 [inline]
__se_sys_exit_group kernel/exit.c:1138 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1138
x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c3ab9e1d9
RSP: 002b:00007f1c3af4fd88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1c3ab9e1d9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f1c3af4fdec R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000009e
R13: 00000000000927c0 R14: 00000000000dd284 R15: 00007f1c3af4fe40
rcu: rcu_preempt kthread starved for 10472 jiffies! g170721 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27560 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 18368 Comm: udevd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:csd_lock kernel/smp.c:396 [inline]
RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:944
Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 91 59 0c 00 41 83 e7 01 75 07 e8 86 54 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01
RSP: 0018:ffffc900055f7460 EFLAGS: 00000293
RAX: ffffffff81bbbade RBX: ffff8880b85414c8 RCX: ffff888028ac5dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900055f75b0 R08: ffff888028ac735f R09: 1ffff11005158e6b
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110170a8299
R13: 0000000000000001 R14: ffff8880b85414c0 R15: 0000000000000001
FS: 00007fc3213c9880(0000) GS:ffff888123abf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b50a083f20 CR3: 000000003c416000 CR4: 00000000003526f0
Call Trace:
__flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x8ff/0x1090 arch/x86/mm/tlb.c:1435
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline]
tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:423
tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:549
unmap_region+0x2a5/0x330 mm/vma.c:535
vms_clear_ptes mm/vma.c:1383 [inline]
vms_complete_munmap_vmas+0x427/0xbe0 mm/vma.c:1425
do_vmi_align_munmap+0x3b7/0x4b0 mm/vma.c:1684
do_vmi_munmap+0x252/0x2d0 mm/vma.c:1732
__vm_munmap+0x241/0x3e0 mm/vma.c:3415
__do_sys_munmap mm/mmap.c:1094 [inline]
__se_sys_munmap mm/mmap.c:1091 [inline]
__x64_sys_munmap+0x60/0x70 mm/mmap.c:1091
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc320d1e097
Code: 73 01 c3 48 8b 0d 61 2d 0d 00 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 8b 0d 31 2d 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffdfa0dccd8 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055b50a052bf0 RCX: 00007fc320d1e097
RDX: 0000000000000000 RSI: 00000000009480e8 RDI: 00007fc320200000
RBP: 000055b50a052910 R08: 000055b50a065140 R09: 0000000000000006
R10: 0000000000000000 R11: 0000000000000206 R12: 000055b4ec09e588
R13: 00007ffdfa0dcd60 R14: 0000000000000000 R15: 0000000000000000