watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.3:31187] Modules linked in: irq event stamp: 2678109 hardirqs last enabled at (2678108): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (2678109): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (2655962): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (2655965): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2655965): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 31187 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unwind_get_return_address arch/x86/kernel/unwind_orc.c:297 [inline] RIP: 0010:unwind_get_return_address+0x6a/0x90 arch/x86/kernel/unwind_orc.c:292 Code: ea 03 80 3c 02 00 75 32 48 8b 7b 48 e8 9f a0 15 00 85 c0 74 d3 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 <75> 18 48 8b 43 48 5b 5d c3 e8 c8 e4 6e 00 eb a8 48 89 ef e8 4e e5 RSP: 0018:ffff8880ba1076c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8880ba1076e8 RCX: 0000000000000000 RDX: 1ffff11017420ee6 RSI: ffff8880ba107548 RDI: ffffffff8678c718 RBP: ffff8880ba107730 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880ba107747 R11: 0000000000074071 R12: ffff8880ba107780 R13: 0000000000000000 R14: ffff88813bff04c0 R15: 0000000000000060 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcdb988eff8 CR3: 0000000009e6d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0xaf/0x190 arch/x86/kernel/stacktrace.c:45 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 mm/slab.c:3397 [inline] kmem_cache_alloc_trace+0x11a/0x380 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] dst_cow_metrics_generic+0x48/0x190 net/core/dst.c:213 dst_metrics_write_ptr include/net/dst.h:129 [inline] dst_metric_set include/net/dst.h:190 [inline] icmp6_dst_alloc+0x49a/0x660 net/ipv6/route.c:2745 ndisc_send_skb+0xd10/0x1720 net/ipv6/ndisc.c:471 ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x384/0x6a0 net/ipv6/addrconf.c:3835 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:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911 Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 09 2e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff88801fbf7668 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: ffff88802a1a0340 RCX: ff934e6a97baa5c9 RDX: dffffc0000000000 RSI: 000000009dc2ee2c RDI: 0000000000000286 RBP: ffffffff89f85fa0 R08: 0000000031958bc5 R09: 0000000000000001 R10: ffff88802a1a0bf0 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] lock_page_memcg+0x36/0x220 mm/memcontrol.c:1908 page_remove_file_rmap+0x36/0xa30 mm/rmap.c:1212 page_remove_rmap+0xe5/0x120 mm/rmap.c:1297 zap_pte_range mm/memory.c:1350 [inline] zap_pmd_range mm/memory.c:1463 [inline] zap_pud_range mm/memory.c:1492 [inline] zap_p4d_range mm/memory.c:1513 [inline] unmap_page_range+0x147d/0x2c50 mm/memory.c:1534 unmap_single_vma+0x198/0x300 mm/memory.c:1579 unmap_vmas+0xa9/0x180 mm/memory.c:1609 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1016 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1037 exit_mm kernel/exit.c:549 [inline] do_exit+0xaec/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fcdbaf19fe9 Code: Bad RIP value. RSP: 002b:00007fcdb988f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: 0000000000000000 RBX: 00007fcdbb02cf60 RCX: 00007fcdbaf19fe9 RDX: 0000000020000240 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 00007fcdbaf7408d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc02c46ddf R14: 00007fcdb988f300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6028 Comm: kworker/u4:2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__lock_acquire+0x19f/0x3ff0 kernel/locking/lockdep.c:3275 Code: 4c 89 f7 e8 c3 92 ff ff 48 85 c0 0f 85 b5 00 00 00 45 31 ff 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7 00 00 00 00 00 <48> c7 40 08 00 00 00 00 c7 40 18 00 00 00 00 48 8b 84 24 90 01 00 RSP: 0018:ffff8880491efa68 EFLAGS: 00000086 RAX: ffffed100923df60 RBX: ef545f96172bec08 RCX: c13fb1d4a171beda RDX: 1ffff110054885d0 RSI: 0000000019c6f1f6 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000073e22ad8 R09: 0000000000000002 R10: ffff88802a442ed8 R11: 0000000000000000 R12: c13fb1d4a171beda R13: ffff88802a442600 R14: ffff88802a442ef0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0151237f0 CR3: 00000000b32b6000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline] batadv_nc_worker+0x12d/0xd50 net/batman-adv/network-coding.c:730 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), 1 bytes skipped: 0: 03 80 3c 02 00 75 add 0x7500023c(%rax),%eax 6: 32 48 8b xor -0x75(%rax),%cl 9: 7b 48 jnp 0x53 b: e8 9f a0 15 00 callq 0x15a0af 10: 85 c0 test %eax,%eax 12: 74 d3 je 0xffffffe7 14: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1b: fc ff df 1e: 48 89 ea mov %rbp,%rdx 21: 48 c1 ea 03 shr $0x3,%rdx 25: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 29: 75 18 jne 0x43 <-- trapping instruction 2b: 48 8b 43 48 mov 0x48(%rbx),%rax 2f: 5b pop %rbx 30: 5d pop %rbp 31: c3 retq 32: e8 c8 e4 6e 00 callq 0x6ee4ff 37: eb a8 jmp 0xffffffe1 39: 48 89 ef mov %rbp,%rdi 3c: e8 .byte 0xe8 3d: 4e rex.WRX 3e: e5 .byte 0xe5