rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=45c4/1/0x4000000000000000 softirq=39319/39320 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13216/1:b..l rcu: (detected by 1, t=10502 jiffies, g=54745, q=1260 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13214 Comm: syz.5.2532 Not tainted 6.11.0-rc7-syzkaller-00017-gbc83b4d1f086 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__kasan_check_write+0x0/0x20 mm/kasan/shadow.c:36 Code: 48 8b 0c 24 31 d2 e9 6f e6 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 3c e6 ff ff 66 2e RSP: 0018:ffffc90000007b98 EFLAGS: 00000097 RAX: 0000000000000004 RBX: dffffc0000000000 RCX: 0000000000007c03 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff888061c712e8 RBP: ffffc90000007c80 R08: ffffffff941e493f R09: 1ffffffff283c927 R10: dffffc0000000000 R11: fffffbfff283c928 R12: ffff888061c712e8 R13: 1ffff92000000f80 R14: ffffc90000007c00 R15: 1ffff1100c38e25e FS: 00007fa4129016c0(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000033072000 CR4: 0000000000350ef0 Call Trace: instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline] queued_spin_lock include/asm-generic/qspinlock.h:111 [inline] do_raw_spin_lock+0x142/0x370 kernel/locking/spinlock_debug.c:116 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x59d/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 6a 39 ac f5 48 89 df e8 42 7c ad f5 e8 5d 37 d7 f5 fb bf 01 00 00 00 52 47 9f f5 65 8b 05 23 1d 40 74 85 c0 74 06 5b e9 1c 87 2c 00 RSP: 0018:ffffc900044b6f90 EFLAGS: 00000286 RAX: c80a058612876800 RBX: ffff888031ce37e8 RCX: ffffffff81703fea RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: 0000000000000001 RBP: ffffc900044b70f0 R08: ffffffff941e4877 R09: 1ffffffff283c90e R10: dffffc0000000000 R11: fffffbfff283c90f R12: dffffc0000000000 R13: 0000000000000cc0 R14: 1ffff92000896e0b R15: ffffea0001736300 spin_unlock_irq include/linux/spinlock.h:401 [inline] shmem_add_to_page_cache+0x951/0x1830 mm/shmem.c:817 shmem_alloc_and_add_folio+0x948/0x14f0 mm/shmem.c:1810 shmem_get_folio_gfp+0x8dc/0x2370 mm/shmem.c:2188 shmem_fault+0x252/0x6f0 mm/shmem.c:2388 __do_fault+0x137/0x460 mm/memory.c:4655 do_read_fault mm/memory.c:5061 [inline] do_fault mm/memory.c:5191 [inline] do_pte_missing mm/memory.c:3947 [inline] handle_pte_fault+0x321f/0x6fc0 mm/memory.c:5521 __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832 faultin_page mm/gup.c:1194 [inline] __get_user_pages+0x6ec/0x16a0 mm/gup.c:1493 populate_vma_page_range+0x264/0x330 mm/gup.c:1932 __mm_populate+0x27a/0x460 mm/gup.c:2035 mm_populate include/linux/mm.h:3430 [inline] vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593 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: 0033:0x7fa411b7def9 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:00007fa412901038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fa411d35f80 RCX: 00007fa411b7def9 RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007fa411bf09f6 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa411d35f80 R15: 00007ffeb164dac8 task:syz.4.2530 state:R running task stack:25040 pid:13216 tgid:13205 ppid:12272 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:stack_trace_consume_entry+0x0/0x280 kernel/stacktrace.c:83 Code: a4 7b 00 e9 6a ff ff ff e8 0d 6a 3a 0a 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 fb 48 RSP: 0018:ffffc900036bed38 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffffffff82131a2d RCX: ffff88802ff98000 RDX: 0000000000000000 RSI: ffffffff82131a2d RDI: ffffc900036bee20 RBP: ffffc900036bedd0 R08: ffffffff81378a22 R09: ffffffff814140bf R10: 0000000000000003 R11: ffffffff817f2f80 R12: ffff88802ff98000 R13: ffffffff817f2f80 R14: ffffc900036bee20 R15: ffffc900036bed40 arch_stack_walk+0x145/0x1b0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x430 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2667 folios_put_refs+0x76e/0x860 mm/swap.c:1039 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x6de/0x1df0 mm/shmem.c:1023 shmem_truncate_range mm/shmem.c:1132 [inline] shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1260 evict+0x534/0x950 fs/inode.c:704 __dentry_kill+0x20d/0x630 fs/dcache.c:615 dput+0x19f/0x2b0 fs/dcache.c:857 __fput+0x5f8/0x8a0 fs/file_table.c:430 task_work_run+0x251/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 get_signal+0x16a1/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f41f617def9 RSP: 002b:00007f41f6fd70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f41f6336060 RCX: 00007f41f617def9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f41f6336060 RBP: 00007f41f6336058 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f41f6336064 R13: 0000000000000000 R14: 00007ffd706fa310 R15: 00007ffd706fa3f8 rcu: rcu_preempt kthread starved for 10502 jiffies! g54745 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:25328 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 13227 Comm: syz.2.2534 Not tainted 6.11.0-rc7-syzkaller-00017-gbc83b4d1f086 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:215 Code: 8b 3d 6c 76 96 0c 48 89 de 5b e9 43 9a 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 00 d7 03 00 65 8b 15 40 4a 70 7e 81 e2 00 01 ff 00 RSP: 0018:ffffc900091dfa38 EFLAGS: 00000202 RAX: ffffffff818778e8 RBX: 1ffff11017108c59 RCX: 0000000000040000 RDX: ffffc900106ab000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc900091dfc10 R08: ffffffff818778b7 R09: 1ffffffff2030ebd R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880b88462c8 R14: ffff8880b893fb40 R15: 0000000000000000 FS: 00007f84c6abe6c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2bec3e CR3: 000000002dd56000 CR4: 0000000000350ef0 Call Trace: csd_lock_wait kernel/smp.c:312 [inline] smp_call_function_many_cond+0x1878/0x29d0 kernel/smp.c:856 clock_was_set+0x75c/0x810 kernel/time/hrtimer.c:972 do_settimeofday64+0x488/0x650 kernel/time/timekeeping.c:1474 __do_sys_clock_settime kernel/time/posix-timers.c:1129 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1113 [inline] __x64_sys_clock_settime+0x23c/0x280 kernel/time/posix-timers.c:1113 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: 0033:0x7f84c5d7def9 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:00007f84c6abe038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00007f84c5f36058 RCX: 00007f84c5d7def9 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000000 RBP: 00007f84c5df09f6 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f84c5f36058 R15: 00007ffee5b807b8