rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=904c/1/0x4000000000000000 softirq=16349/16355 fqs=97 rcu: (detected by 1, t=10502 jiffies, g=13585, q=1154 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6933 Comm: syz.4.331 Not tainted 6.12.0-rc4-syzkaller-00281-g284a2f899676 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d e4 17 9d 0c 48 89 de 5b e9 43 d5 5d 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d7 03 00 65 8b 15 40 ed RSP: 0018:ffffc90000007d38 EFLAGS: 00000097 RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffff88801eb08000 RDX: ffff88801eb08000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: ffffc90000007ea8 R08: ffffffff81827608 R09: 1ffffffff34d1e89 R10: dffffc0000000000 R11: fffffbfff34d1e8a R12: 1ffff110170c593b R13: dffffc0000000000 R14: ffff88805d3da340 R15: ffff8880b862c980 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c319813 CR3: 0000000064ccc000 CR4: 0000000000350ef0 Call Trace: cpu_max_bits_warn include/linux/cpumask.h:135 [inline] cpumask_check include/linux/cpumask.h:142 [inline] cpumask_test_cpu include/linux/cpumask.h:570 [inline] cpu_online include/linux/cpumask.h:1117 [inline] trace_hrtimer_cancel include/trace/events/timer.h:317 [inline] debug_deactivate+0x42/0x220 kernel/time/hrtimer.c:485 __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:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x6c7/0x22d0 arch/x86/kernel/unwind_orc.c:494 Code: 00 4d 89 ec 4d 89 ee 48 89 e8 4c 29 f0 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 49 8d 1c 46 48 89 d8 48 c1 e8 03 <48> b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 48 63 03 48 RSP: 0018:ffffc9000bb27270 EFLAGS: 00000213 RAX: 1ffffffff206a01f RBX: ffffffff903500fc RCX: 0000000000000000 RDX: 00000000000b0001 RSI: ffffffff90ae1956 RDI: ffffffff814166e0 RBP: ffffffff903500fc R08: 0000000000000001 R09: ffffc9000bb27430 R10: dffffc0000000000 R11: ffffffff8180a2c0 R12: ffffffff903500fc R13: ffffffff903500fc R14: ffffffff903500fc R15: ffffffff81e8c085 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kmem_cache_free+0x1a2/0x420 mm/slub.c:4681 vma_lock_free kernel/fork.c:458 [inline] __vm_area_free+0xe3/0x110 kernel/fork.c:514 exit_mmap+0x5c6/0xc40 mm/mmap.c:1898 __mmput+0x115/0x390 kernel/fork.c:1347 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x28e0 kernel/exit.c:926 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x16a3/0x1740 kernel/signal.c:2917 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: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: 0033:0x7fbb56f7e719 Code: Unable to access opcode bytes at 0x7fbb56f7e6ef. RSP: 002b:00007fbb57da30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fbb57135f88 RCX: 00007fbb56f7e719 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbb57135f88 RBP: 00007fbb57135f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbb57135f8c R13: 0000000000000000 R14: 00007ffedae6d8d0 R15: 00007ffedae6d9b8 rcu: rcu_preempt kthread starved for 10307 jiffies! g13585 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:25856 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: 6944 Comm: syz.2.336 Not tainted 6.12.0-rc4-syzkaller-00281-g284a2f899676 #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+0x19f3/0x2ca0 kernel/smp.c:884 Code: 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 96 f3 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 41 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 25 ef RSP: 0018:ffffc9001b4b75a0 EFLAGS: 00000246 RAX: ffffffff8188fb4b RBX: 1ffff110170c8ca1 RCX: 0000000000040000 RDX: ffffc9000ad9d000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9001b4b7788 R08: ffffffff8188fb1a R09: 1ffffffff285992c R10: dffffc0000000000 R11: fffffbfff285992d R12: dffffc0000000000 R13: ffff8880b8646508 R14: ffff8880b873fc80 R15: 0000000000000000 FS: 00007fe7a11ff6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30d0eff8 CR3: 000000002f29c000 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 init_sb+0x9b3/0x1270 fs/gfs2/ops_fstype.c:503 gfs2_fill_super+0x19b3/0x24d0 fs/gfs2/ops_fstype.c:1216 get_tree_bdev+0x3f9/0x570 fs/super.c:1635 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1330 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: 0033:0x7fe7a177feba 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:00007fe7a11fee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe7a11feef0 RCX: 00007fe7a177feba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe7a11feeb0 RBP: 0000000020000000 R08: 00007fe7a11feef0 R09: 0000000000208c1b R10: 0000000000208c1b R11: 0000000000000246 R12: 0000000020000100 R13: 00007fe7a11feeb0 R14: 0000000000012754 R15: 0000000020000040