rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=9364/1/0x4000000000000000 softirq=17274/17274 fqs=0
rcu: (detected by 0, t=10502 jiffies, g=12881, q=1431 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6682 Comm: syz.3.238 Not tainted 6.14.0-rc7-syzkaller-00205-g586de92313fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 94 53 93 0c 48 89 de 5b e9 93 e5 5b 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 80 d6 03 00 65 8b 15 a0 f6
RSP: 0018:ffffc90000a28b78 EFLAGS: 00000046
RAX: 0000000000010000 RBX: 0000000000000001 RCX: ffffffff89cab061
RDX: ffff88805138da00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000a28c60 R08: ffffffff89cab08a R09: 1ffff11004671c2b
R10: dffffc0000000000 R11: ffffed1004671c2c R12: ffff88802338e000
R13: dffffc0000000000 R14: 1ffff92000145174 R15: ffff88802338e300
FS: 00007f75405aa6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 0000000033a1a000 CR4: 0000000000350ef0
Call Trace:
<NMI>
</NMI>
<IRQ>
__netif_schedule+0xc4/0x310 net/core/dev.c:3349
advance_sched+0xaa9/0xca0 net/sched/sch_taprio.c:986
__run_hrtimer kernel/time/hrtimer.c:1801 [inline]
__hrtimer_run_queues+0x59d/0xd30 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 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:check_preemption_disabled+0x3c/0x120
Code: 00 00 48 89 44 24 08 65 8b 1d 0c bb fa 73 65 8b 05 01 bb fa 73 a9 ff ff ff 7f 74 26 65 48 8b 04 25 28 00 00 00 48 3b 44 24 08 <0f> 85 ce 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e 41 5f e9 57 25
RSP: 0018:ffffc9001d77ee08 EFLAGS: 00000246
RAX: f0191a16e23b8900 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90004f73000 RSI: ffffffff8c810080 RDI: ffffffff8c810040
RBP: ffffc9001d77ef30 R08: ffffffff81fea7a4 R09: 1ffffffff28a9b13
R10: dffffc0000000000 R11: fffffbfff28a9b14 R12: dffffc0000000000
R13: ffffea000162dec0 R14: ffff8880b87379e0 R15: 0000000000000000
__folio_batch_add_and_move+0x3df/0xd70 mm/swap.c:194
shmem_alloc_and_add_folio+0xdd9/0x1090 mm/shmem.c:1961
shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2545
shmem_read_folio_gfp+0xd5/0x170 mm/shmem.c:5942
drm_gem_get_pages+0x217/0xb80 drivers/gpu/drm/drm_gem.c:594
drm_gem_shmem_get_pages+0xdd/0x290 drivers/gpu/drm/drm_gem_shmem_helper.c:199
drm_gem_shmem_mmap+0x1a1/0x4e0 drivers/gpu/drm/drm_gem_shmem_helper.c:642
drm_gem_mmap_obj+0x184/0x560 drivers/gpu/drm/drm_gem.c:1084
drm_gem_mmap+0x49d/0x7d0 drivers/gpu/drm/drm_gem.c:1162
call_mmap include/linux/fs.h:2245 [inline]
mmap_file mm/internal.h:124 [inline]
__mmap_new_file_vma mm/vma.c:2296 [inline]
__mmap_new_vma mm/vma.c:2360 [inline]
__mmap_region mm/vma.c:2462 [inline]
mmap_region+0x246f/0x2fc0 mm/vma.c:2540
do_mmap+0xecc/0x13a0 mm/mmap.c:561
vm_mmap_pgoff+0x2a0/0x530 mm/util.c:578
ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:607
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f753f78d169
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:00007f75405aa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f753f9a5fa0 RCX: 00007f753f78d169
RDX: 0000000000000004 RSI: 0000000000004000 RDI: 0000200000001000
RBP: 00007f753f80e2a0 R08: 0000000000000003 R09: 0000000100000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f753f9a5fa0 R15: 00007ffdb62e93c8
</TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g12881 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:24144 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
kthread+0x7ab/0x920 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6676 Comm: syz.1.235 Not tainted 6.14.0-rc7-syzkaller-00205-g586de92313fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1bae/0x2d30 kernel/smp.c:885
Code: 89 e6 83 e6 01 31 ff e8 c0 f4 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 70 f0 0b 00 eb 41 f3 90 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 03 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 4b f0 0b
RSP: 0018:ffffc9001d6ef400 EFLAGS: 00000293
RAX: dffffc0000000000 RBX: 1ffff110170e88f9 RCX: ffff88802ac29e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9001d6ef600 R08: ffffffff81b5ef50 R09: 1ffffffff28a9b0e
R10: dffffc0000000000 R11: fffffbfff28a9b0f R12: ffff8880b863fb48
R13: ffff8880b87447c8 R14: ffff8880b863fb40 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3030eff8 CR3: 000000006fc26000 CR4: 0000000000350ef0
Call Trace:
<IRQ>
</IRQ>
<TASK>
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:966 [inline]
flush_tlb_mm_range+0x42d/0x710 arch/x86/mm/tlb.c:1054
tlb_flush arch/x86/include/asm/tlb.h:20 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:481 [inline]
tlb_flush_mmu+0x1aa/0x680 mm/mmu_gather.c:395
tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:488
exit_mmap+0x52a/0xd40 mm/mmap.c:1297
__mmput+0x115/0x420 kernel/fork.c:1356
exit_mm+0x220/0x310 kernel/exit.c:570
do_exit+0x9ad/0x2940 kernel/exit.c:925
do_group_exit+0x207/0x2c0 kernel/exit.c:1087
get_signal+0x168c/0x1720 kernel/signal.c:3036
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a5458d169
Code: Unable to access opcode bytes at 0x7f6a5458d13f.
RSP: 002b:00007f6a553b80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f6a547a5fa8 RCX: 00007f6a5458d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6a547a5fa8
RBP: 00007f6a547a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6a547a5fac
R13: 0000000000000000 R14: 00007fffb9b4bfc0 R15: 00007fffb9b4c0a8
</TASK>