watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.5:32740] Modules linked in: irq event stamp: 3641601 hardirqs last enabled at (3641600): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3641601): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (751650): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (751653): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (751653): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 32740 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:calculate_probability net/sched/sch_pie.c:325 [inline] RIP: 0010:pie_timer+0xf6/0x740 net/sched/sch_pie.c:434 Code: b0 02 00 00 48 89 fa 48 c1 ea 03 89 44 24 0c 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 0f 85 21 06 00 00 48 8b 83 b0 02 00 00 <48> 8d bb b8 02 00 00 48 89 fa 48 c1 ea 03 48 89 04 24 48 b8 00 00 RSP: 0018:ffff8880ba007cb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8880961964c0 RCX: ffffffff814bdebb RDX: 1ffff11012c32cee RSI: 0000000000000004 RDI: ffff888096196770 RBP: ffff88809f9ea080 R08: 0000000000000001 R09: ffffed1012c32cb5 R10: ffff8880961965ab R11: 0000000000000000 R12: ffff8880ba007d58 R13: 1ffff11017400fa7 R14: ffff8880961967b0 R15: 0000000000000000 FS: 00007f80fc8b3700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc88f1ac20 CR3: 000000009b27c000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 88 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d 7c 31 d8 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 fb eb e6 f8 eb c0 0f 0b 0f 0b 48 c7 c7 88 RSP: 0018:ffff888033817728 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: 0000000000000286 RCX: 1ffff11006ccb96a RDX: dffffc0000000000 RSI: ffff88803665cb30 RDI: 0000000000000286 RBP: ffffffff8d430888 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809b18a050 R13: 0000000000000000 R14: 1ffff11006702eea R15: ffffffff89f85e80 debug_object_activate+0x295/0x450 lib/debugobjects.c:498 debug_object_activate+0x390/0x450 lib/debugobjects.c:513 debug_rcu_head_queue kernel/rcu/rcu.h:193 [inline] __call_rcu.constprop.0+0x31/0x7f0 kernel/rcu/tree.c:2977 __purge_vmap_area_lazy+0x17c/0x280 mm/vmalloc.c:687 vm_unmap_aliases mm/vmalloc.c:1113 [inline] vm_unmap_aliases+0x415/0x510 mm/vmalloc.c:1076 change_page_attr_set_clr+0x247/0xc60 arch/x86/mm/pageattr.c:1497 change_page_attr_clear arch/x86/mm/pageattr.c:1560 [inline] set_memory_ro+0x78/0xa0 arch/x86/mm/pageattr.c:1789 bpf_prog_lock_ro include/linux/filter.h:714 [inline] bpf_prog_select_runtime+0xb2/0x620 kernel/bpf/core.c:1587 bpf_prog_load+0xcf9/0x1230 kernel/bpf/syscall.c:1454 __do_sys_bpf kernel/bpf/syscall.c:2423 [inline] __se_sys_bpf+0xf22/0x3a20 kernel/bpf/syscall.c:2384 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f80ff33dae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f80fc8b3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f80ff450f60 RCX: 00007f80ff33dae9 RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 00007f80ff397f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2f4053bf R14: 00007f80fc8b3300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2888 Comm: kworker/u4:4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:rep_nop arch/x86/include/asm/processor.h:656 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:661 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x1d4/0x420 kernel/smp.c:302 Code: 85 f6 0f 84 b8 00 00 00 e8 09 04 0a 00 48 8b 4c 24 08 48 8b 54 24 10 48 8d 74 24 40 8b 7c 24 1c e8 a1 f9 ff ff 41 89 c5 eb 07 e7 03 0a 00 f3 90 44 8b 64 24 58 31 ff 41 83 e4 01 44 89 e6 e8 RSP: 0018:ffff8880abc16ce0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 1ffff11015782da0 RCX: ffffffff8158819e RDX: 0000000000000001 RSI: ffff8880abc08040 RDI: 0000000000000005 RBP: ffff8880abc16da8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd46bcab718 CR3: 0000000009e6d000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many+0x743/0x8d0 kernel/smp.c:434 flush_tlb_others arch/x86/include/asm/paravirt.h:309 [inline] flush_tlb_mm_range+0x179/0x320 arch/x86/mm/tlb.c:728 flush_tlb_page arch/x86/include/asm/tlbflush.h:576 [inline] ptep_clear_flush+0x123/0x160 mm/pgtable-generic.c:87 page_mkclean_one+0x425/0x860 mm/rmap.c:912 rmap_walk_file+0x539/0xb10 mm/rmap.c:1897 rmap_walk+0x105/0x190 mm/rmap.c:1915 page_mkclean+0x20f/0x2b0 mm/rmap.c:981 clear_page_dirty_for_io+0x305/0xee0 mm/page-writeback.c:2687 mpage_submit_page+0x80/0x250 fs/ext4/inode.c:2215 mpage_process_page_bufs+0x534/0x630 fs/ext4/inode.c:2345 mpage_prepare_extent_to_map+0x9a2/0xf10 fs/ext4/inode.c:2707 ext4_writepages+0x111d/0x37f0 fs/ext4/inode.c:2835 do_writepages+0xe5/0x290 mm/page-writeback.c:2344 __writeback_single_inode+0x10c/0x11d0 fs/fs-writeback.c:1385 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1716 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1822 wb_check_old_data_flush fs/fs-writeback.c:1924 [inline] wb_do_writeback fs/fs-writeback.c:1977 [inline] wb_workfn+0x8ba/0x1250 fs/fs-writeback.c:2006 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ---------------- Code disassembly (best guess): 0: b0 02 mov $0x2,%al 2: 00 00 add %al,(%rax) 4: 48 89 fa mov %rdi,%rdx 7: 48 c1 ea 03 shr $0x3,%rdx b: 89 44 24 0c mov %eax,0xc(%rsp) f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 1d: 0f 85 21 06 00 00 jne 0x644 23: 48 8b 83 b0 02 00 00 mov 0x2b0(%rbx),%rax * 2a: 48 8d bb b8 02 00 00 lea 0x2b8(%rbx),%rdi <-- trapping instruction 31: 48 89 fa mov %rdi,%rdx 34: 48 c1 ea 03 shr $0x3,%rdx 38: 48 89 04 24 mov %rax,(%rsp) 3c: 48 rex.W 3d: b8 .byte 0xb8