rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=e624/1/0x4000000000000000 softirq=16316/16317 fqs=7 rcu: (detected by 1, t=10505 jiffies, g=14073, q=822 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6894 Comm: syz.2.280 Not tainted 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:kasan_check_range+0xc/0x290 mm/kasan/generic.c:188 Code: 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 41 57 41 56 41 54 53 01 48 85 f6 0f 84 a0 01 00 00 4c 8d 04 37 49 39 f8 0f 82 56 02 RSP: 0018:ffffc90000007a10 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81704824 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d04a8 RBP: ffffc90000007b88 R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52000000f92 R12: 1ffff92000000f50 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fb629dad6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3372a8 CR3: 00000000248b8000 CR4: 0000000000350ef0 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] cpumask_test_cpu include/linux/cpumask.h:570 [inline] cpu_online include/linux/cpumask.h:1117 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0xd4/0x550 kernel/locking/lockdep.c:5796 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 debug_object_deactivate+0x158/0x390 lib/debugobjects.c:763 debug_hrtimer_deactivate kernel/time/hrtimer.c:428 [inline] debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:484 __run_hrtimer kernel/time/hrtimer.c:1659 [inline] __hrtimer_run_queues+0x305/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 6e e3 2d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 33 7a 92 f5 65 8b 05 64 22 33 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc9001b76f8c0 EFLAGS: 00000206 RAX: 0b4f8268af580c00 RBX: 1ffff920036edf1c RCX: ffffffff9a3d3903 RDX: dffffc0000000000 RSI: ffffffff8c0acac0 RDI: 0000000000000001 RBP: ffffc9001b76f958 R08: ffffffff901d04af R09: 1ffffffff203a095 R10: dffffc0000000000 R11: fffffbfff203a096 R12: dffffc0000000000 R13: 1ffff920036edf18 R14: ffffc9001b76f8e0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] timerfd_clock_was_set+0x1e0/0x2f0 fs/timerfd.c:113 clock_was_set+0x78e/0x810 kernel/time/hrtimer.c:978 timekeeping_inject_offset+0x4e8/0x580 kernel/time/timekeeping.c:1524 do_adjtimex+0x51d/0xae0 kernel/time/timekeeping.c:2575 do_clock_adjtime kernel/time/posix-timers.c:1174 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1186 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1177 [inline] __x64_sys_clock_adjtime+0x1e3/0x290 kernel/time/posix-timers.c:1177 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: 0033:0x7fb628f7e719 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:00007fb629dad038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007fb629136058 RCX: 00007fb628f7e719 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007fb628ff132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb629136058 R15: 00007fff90d0ca28 rcu: rcu_preempt kthread starved for 10470 jiffies! g14073 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:24432 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x18af/0x4bd0 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 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: 6899 Comm: syz.5.283 Not tainted 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x19f8/0x2ca0 kernel/smp.c:884 Code: 89 e6 83 e6 01 31 ff e8 86 f3 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 31 ef 0b 00 eb 38 f3 90 42 0f b6 04 23 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 15 ef 0b 00 eb e4 44 RSP: 0018:ffffc90002d4f760 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff110170c8ca1 RCX: 0000000000040000 RDX: ffffc9000bdc2000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc90002d4f948 R08: ffffffff8188eada R09: 1ffffffff2859925 R10: dffffc0000000000 R11: fffffbfff2859926 R12: dffffc0000000000 R13: ffff8880b8646508 R14: ffff8880b873fc80 R15: 0000000000000000 FS: 00007f2cb3de96c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2cb2f60f40 CR3: 000000005efe6000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1051 kill_bdev block/bdev.c:90 [inline] set_blocksize+0x2e2/0x360 block/bdev.c:173 sb_set_blocksize+0x47/0xf0 block/bdev.c:182 fat_fill_super+0xea0/0x35a0 fs/fat/inode.c:1629 get_tree_bdev+0x3f9/0x570 fs/super.c:1635 vfs_get_tree+0x92/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 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: 0033:0x7f2cb2f7feba Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f2cb3de8e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2cb3de8ef0 RCX: 00007f2cb2f7feba RDX: 0000000020003880 RSI: 0000000020000000 RDI: 00007f2cb3de8eb0 RBP: 0000000020003880 R08: 00007f2cb3de8ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00007f2cb3de8eb0 R14: 00000000000002a2 R15: 0000000020000980