IPv6: ADDRCONF(NETDEV_UP): vlan824: link is not ready watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.0:3694] Modules linked in: irq event stamp: 3288919 hardirqs last enabled at (3288918): [] kfree+0x110/0x210 mm/slab.c:3823 hardirqs last disabled at (3288919): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (4072): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (6473): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (6473): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 3694 Comm: syz-executor.0 Not tainted 4.19.208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:kfree+0x123/0x210 mm/slab.c:3823 Code: 89 ea 48 89 ee 4c 89 e7 e8 da ee ff ff f6 c7 02 74 ca e8 20 76 cf ff 48 83 3d b0 50 59 08 00 0f 84 eb 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c 41 5d c3 65 8b 05 3a 4f 69 7e 83 f8 07 RSP: 0018:ffff8880ba007a70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffff110028b0585 RDX: 0000000000000000 RSI: ffff888014582c30 RDI: 0000000000000286 RBP: ffff8882322932c0 R08: 0000000000400000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88813bff0c40 R13: ffffffff8670ad6e R14: 0000000000000000 R15: ffff8882322939b0 FS: 00007f0c3fe97700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555557206808 CR3: 0000000238e2b000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: skb_free_head net/core/skbuff.c:563 [inline] skb_release_data+0x6de/0x920 net/core/skbuff.c:583 skb_release_all net/core/skbuff.c:640 [inline] __kfree_skb net/core/skbuff.c:654 [inline] kfree_skb+0x11a/0x3d0 net/core/skbuff.c:672 kfree_skb_list+0x3f/0x60 net/core/skbuff.c:681 __dev_xmit_skb net/core/dev.c:3506 [inline] __dev_queue_xmit+0x2973/0x2e00 net/core/dev.c:3807 mrp_queue_xmit net/802/mrp.c:367 [inline] mrp_join_timer+0x8a/0xc0 net/802/mrp.c:611 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:orc_find arch/x86/kernel/unwind_orc.c:150 [inline] RIP: 0010:unwind_next_frame+0x285/0x1400 arch/x86/kernel/unwind_orc.c:422 Code: 48 89 54 24 30 48 89 74 24 28 44 89 5c 24 20 e8 21 db 6e 00 48 8b 54 24 30 48 8b 74 24 28 44 8b 5c 24 20 8b 0c 95 d8 8f 17 8c <8d> 56 01 48 b8 00 00 00 00 00 fc ff df 48 8d 3c 95 d8 8f 17 8c 49 RSP: 0018:ffff888238ba73e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000003 RBX: 1ffff11047174e85 RCX: 0000000000116bcb RDX: 0000000000056e80 RSI: 0000000000056e80 RDI: ffffffff8c2d49d8 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 R10: ffff888238ba756f R11: 0000000000074071 R12: ffff888238ba7558 R13: ffff888238ba7545 R14: ffff888238ba7510 R15: ffffffff866e8010 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 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 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc_node mm/slab.c:3340 [inline] kmem_cache_alloc_node+0x133/0x3b0 mm/slab.c:3647 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] alloc_skb_with_frags+0x92/0x570 net/core/skbuff.c:5333 sock_alloc_send_pskb+0x6e1/0x830 net/core/sock.c:2090 unix_stream_sendmsg+0x59c/0x910 net/unix/af_unix.c:1894 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0c429208d9 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:00007f0c3fe97188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0c42a24f60 RCX: 00007f0c429208d9 RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000004 RBP: 00007f0c4297acb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffef9ca16cf R14: 00007f0c3fe97300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3585 Comm: kworker/u4:4 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:__read_once_size include/linux/compiler.h:261 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x1db/0x420 kernel/smp.c:302 Code: 00 e8 a9 03 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 e8 87 03 0a 00 f3 90 <44> 8b 64 24 58 31 ff 41 83 e4 01 44 89 e6 e8 e2 04 0a 00 45 85 e4 RSP: 0018:ffff8880a886ece0 EFLAGS: 00000293 RAX: ffff8880a885a580 RBX: 1ffff1101510dda0 RCX: ffffffff815880ae RDX: 0000000000000000 RSI: ffffffff81588099 RDI: 0000000000000005 RBP: ffff8880a886eda8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 000000009d8ee918 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: 0000555556e51848 CR3: 000000004d7d6000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 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: 89 ea mov %ebp,%edx 2: 48 89 ee mov %rbp,%rsi 5: 4c 89 e7 mov %r12,%rdi 8: e8 da ee ff ff callq 0xffffeee7 d: f6 c7 02 test $0x2,%bh 10: 74 ca je 0xffffffdc 12: e8 20 76 cf ff callq 0xffcf7637 17: 48 83 3d b0 50 59 08 cmpq $0x0,0x85950b0(%rip) # 0x85950cf 1e: 00 1f: 0f 84 eb 00 00 00 je 0x110 25: 48 89 df mov %rbx,%rdi 28: 57 push %rdi 29: 9d popfq * 2a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2f: 5b pop %rbx 30: 5d pop %rbp 31: 41 5c pop %r12 33: 41 5d pop %r13 35: c3 retq 36: 65 8b 05 3a 4f 69 7e mov %gs:0x7e694f3a(%rip),%eax # 0x7e694f77 3d: 83 f8 07 cmp $0x7,%eax