IPv6: ADDRCONF(NETDEV_UP): vlan162: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan266: link is not ready watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.2:6889] Modules linked in: irq event stamp: 3178263 hardirqs last enabled at (3178262): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3178263): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (26162): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (26225): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (26225): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 6889 Comm: syz-executor.2 Not tainted 4.19.208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:26 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:48 Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 RSP: 0018:ffff8880ba107688 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff16649e4 RBX: ffffffff8b324f20 RCX: ffffffff8122efe1 RDX: 0000000000000000 RSI: ffffffff8b8fd42c RDI: ffffffff8b324f18 RBP: ffffffff8b324f18 R08: 0000000000000000 R09: ffffffff8b8fd42c R10: ffff8880ba107917 R11: 0000000000074071 R12: ffffffff8b324f28 R13: ffffffff8b324f18 R14: ffffffff8b324f18 R15: dffffc0000000000 FS: 00007f53df5e0700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000040 CR3: 000000003be9e000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:159 [inline] unwind_next_frame+0x339/0x1400 arch/x86/kernel/unwind_orc.c:422 __unwind_start+0x5b8/0x960 arch/x86/kernel/unwind_orc.c:667 unwind_start arch/x86/include/asm/unwind.h:60 [inline] __save_stack_trace+0x72/0x190 arch/x86/kernel/stacktrace.c:43 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc_node+0x146/0x3b0 mm/slab.c:3649 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] mrp_pdu_init net/802/mrp.c:316 [inline] mrp_pdu_append_vecattr_event+0x7d2/0x1050 net/802/mrp.c:415 mrp_attr_event+0x15d/0x220 net/802/mrp.c:510 mrp_mad_event net/802/mrp.c:590 [inline] mrp_join_timer+0x5a/0xc0 net/802/mrp.c:607 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:page_dup_rmap include/linux/rmap.h:190 [inline] RIP: 0010:copy_one_pte mm/memory.c:1053 [inline] RIP: 0010:copy_pte_range mm/memory.c:1114 [inline] RIP: 0010:copy_pmd_range mm/memory.c:1165 [inline] RIP: 0010:copy_pud_range mm/memory.c:1199 [inline] RIP: 0010:copy_p4d_range mm/memory.c:1221 [inline] RIP: 0010:copy_page_range+0x10b8/0x2ff0 mm/memory.c:1283 Code: 15 d6 ff 8b 84 24 e8 00 00 00 83 f8 7f 0f 86 da 0c 00 00 e8 3a 14 d6 ff be 04 00 00 00 4c 89 e7 e8 ad db 0b 00 f0 41 ff 04 24 <49> 8d 7e 30 be 04 00 00 00 e8 9a db 0b 00 f0 41 ff 46 30 4c 89 f8 RSP: 0018:ffff88802108fa28 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: fffff940004a0e5f RBX: 0000000000000008 RCX: ffffffff818c6ff3 RDX: fffff940004a0e5f RSI: 0000000000000004 RDI: ffffea00025072f4 RBP: ffffea00025072c0 R08: 0000000000000001 R09: fffff940004a0e5e R10: ffffea00025072f7 R11: 00000000f39b453f R12: ffffea00025072f4 R13: dffffc0000000000 R14: ffffea00025072c0 R15: ffffea00025072c8 dup_mmap kernel/fork.c:549 [inline] dup_mm kernel/fork.c:1285 [inline] copy_mm kernel/fork.c:1341 [inline] copy_process.part.0+0x5b22/0x8260 kernel/fork.c:1913 copy_process kernel/fork.c:1710 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2219 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f53e2069709 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:00007f53df5e0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f53e216df60 RCX: 00007f53e2069709 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f53e20c3cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff533ede8f R14: 00007f53df5e0300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15438 Comm: kworker/u4:11 Not tainted 4.19.208-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:write_comp_data+0x6c/0x70 kernel/kcov.c:146 Code: 00 00 4e 8d 04 dd 28 00 00 00 4c 39 c6 72 1b 48 83 c7 01 4e 89 54 00 e0 4e 89 4c 00 e8 4a 89 54 00 f0 4a 89 4c d8 20 48 89 38 0f 1f 00 48 8b 0c 24 40 0f b6 d6 40 0f b6 f7 31 ff eb 80 48 8b RSP: 0018:ffff88803ccc6cd8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff11007998da0 RCX: ffffffff815880ae RDX: 0000000000000001 RSI: ffff8880471b8640 RDI: 0000000000000005 RBP: ffff88803ccc6da8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0169c6450 CR3: 00000000a3d84000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:108 [inline] smp_call_function_single+0x1ee/0x420 kernel/smp.c:302 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: 72 4d jb 0x4f 2: 4c 89 e0 mov %r12,%rax 5: 48 29 e8 sub %rbp,%rax 8: 48 89 c2 mov %rax,%rdx b: 48 c1 e8 3f shr $0x3f,%rax f: 48 c1 fa 02 sar $0x2,%rdx 13: 48 01 d0 add %rdx,%rax 16: 48 d1 f8 sar %rax 19: 48 8d 5c 85 00 lea 0x0(%rbp,%rax,4),%rbx 1e: 48 89 d8 mov %rbx,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 0f b6 14 38 movzbl (%rax,%r15,1),%edx * 2a: 48 89 d8 mov %rbx,%rax <-- trapping instruction 2d: 83 e0 07 and $0x7,%eax 30: 83 c0 03 add $0x3,%eax 33: 38 d0 cmp %dl,%al 35: 7c 04 jl 0x3b 37: 84 d2 test %dl,%dl 39: 75 48 jne 0x83 3b: 48 63 03 movslq (%rbx),%rax 3e: 48 rex.W 3f: 01 .byte 0x1