rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (3 ticks this GP) idle=0d24/1/0x4000000000000000 softirq=10229/10229 fqs=0
	(detected by 0, t=10502 jiffies, g=9141, q=752 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4356 Comm: syz-executor Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1b/0x60 kernel/kcov.c:216
Code: 89 de 5b e9 07 ad 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d 24 98 81 7e 65 8b 15 25 98 81 7e 81 e2 00 01 ff 00 74 11 <81> fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00
RSP: 0018:ffffc900001e0c78 EFLAGS: 00000006
RAX: ffffffff884bbff1 RBX: 0000000000000001 RCX: ffff88802c885940
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888073d16340 R08: 0000000000000004 R09: 0000000000000003
R10: fffff5200003c180 R11: 1ffff9200003c180 R12: ffff888073d162e8
R13: dffffc0000000000 R14: ffff888073d16000 R15: 1ffff11005910c81
FS:  00005555802ef500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000300 CR3: 000000007c57b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 advance_sched+0x81/0x970 net/sched/sch_taprio.c:701
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x522/0xc80 kernel/time/hrtimer.c:1755
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1817
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:50
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 90 90 90 90 90 90 90 b9 00 10 00 00 31 c0 <f3> aa c3 90 90 90 90 90 90 89 c8 48 c1 e9 03 74 18 0f 1f 84 00 00
RSP: 0018:ffffc900033376f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000840
RDX: ffff88807514f000 RSI: 0000000000000001 RDI: ffff88807514f7c0
RBP: 00000000001d2040 R08: dffffc0000000000 R09: ffffed100ea29000
R10: fffff940003a8a47 R11: 1ffffd40003a8a46 R12: 0000000000000001
R13: 0000000000000000 R14: ffffea0001d45200 R15: 0000000000000008
 clear_page arch/x86/include/asm/page_64.h:58 [inline]
 clear_highpage include/linux/highmem.h:242 [inline]
 clear_highpage_kasan_tagged include/linux/highmem.h:252 [inline]
 kernel_init_pages mm/page_alloc.c:1381 [inline]
 post_alloc_hook+0x12c/0x1a0 mm/page_alloc.c:2527
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5606
 alloc_slab_page+0x5d/0x160 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x87/0x2c0 mm/slub.c:1992
 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc+0xa0/0x240 mm/slab_common.c:949
 kmalloc include/linux/slab.h:568 [inline]
 tomoyo_realpath_from_path+0xdf/0x5d0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x1e3/0x600 security/tomoyo/file.c:723
 security_file_ioctl+0x6c/0xa0 security/security.c:1568
 __do_sys_ioctl fs/ioctl.c:864 [inline]
 __se_sys_ioctl+0x48/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fec2d18e56b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007fff1909d300 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fec2d18e56b
RDX: 00007fff1909d360 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007fff1909d360 R08: 000000000000000c R09: 0000000000000004
R10: 0000000000000006 R11: 0000000000000246 R12: 00007fff1909d3ec
R13: 00007fec2d211abe R14: 00007fec2dee4620 R15: 00007fec2d211abe
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g9141 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3036
rcu: rcu_preempt kthread starved for 10502 jiffies! g9141 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28096 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4356 Comm: syz-executor Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:215
Code: 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d 50 ab 7d 0c 48 89 de 5b e9 07 ad 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d 24 98 81 7e 65 8b 15 25 98 81 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc900001e0d18 EFLAGS: 00000046
RAX: ffffffff8170efc5 RBX: 00000000fffffffb RCX: 0000000000010000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffffc900001e0e98 R08: dffffc0000000000 R09: ffffed10171e54b1
R10: ffffed10171e54b1 R11: 1ffff110171e54b0 R12: ffff888073d16340
R13: dffffc0000000000 R14: ffff888073d16368 R15: 0000000000000002
FS:  00005555802ef500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000300 CR3: 000000007c57b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
 static_key_false include/linux/jump_label.h:207 [inline]
 trace_hrtimer_expire_entry include/trace/events/timer.h:239 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x425/0xc80 kernel/time/hrtimer.c:1755
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1817
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:50
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 90 90 90 90 90 90 90 b9 00 10 00 00 31 c0 <f3> aa c3 90 90 90 90 90 90 89 c8 48 c1 e9 03 74 18 0f 1f 84 00 00
RSP: 0018:ffffc900033376f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000840
RDX: ffff88807514f000 RSI: 0000000000000001 RDI: ffff88807514f7c0
RBP: 00000000001d2040 R08: dffffc0000000000 R09: ffffed100ea29000
R10: fffff940003a8a47 R11: 1ffffd40003a8a46 R12: 0000000000000001
R13: 0000000000000000 R14: ffffea0001d45200 R15: 0000000000000008
 clear_page arch/x86/include/asm/page_64.h:58 [inline]
 clear_highpage include/linux/highmem.h:242 [inline]
 clear_highpage_kasan_tagged include/linux/highmem.h:252 [inline]
 kernel_init_pages mm/page_alloc.c:1381 [inline]
 post_alloc_hook+0x12c/0x1a0 mm/page_alloc.c:2527
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5606
 alloc_slab_page+0x5d/0x160 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x87/0x2c0 mm/slub.c:1992
 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc+0xa0/0x240 mm/slab_common.c:949
 kmalloc include/linux/slab.h:568 [inline]
 tomoyo_realpath_from_path+0xdf/0x5d0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x1e3/0x600 security/tomoyo/file.c:723
 security_file_ioctl+0x6c/0xa0 security/security.c:1568
 __do_sys_ioctl fs/ioctl.c:864 [inline]
 __se_sys_ioctl+0x48/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fec2d18e56b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007fff1909d300 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fec2d18e56b
RDX: 00007fff1909d360 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007fff1909d360 R08: 000000000000000c R09: 0000000000000004
R10: 0000000000000006 R11: 0000000000000246 R12: 00007fff1909d3ec
R13: 00007fec2d211abe R14: 00007fec2dee4620 R15: 00007fec2d211abe
 </TASK>