INFO: rcu detected stall in br_handle_frame (2)
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syzbot
Oct 14, 2020, 2:56:21 PM10/14/20
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Hello,
syzbot found the following issue on:
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10296607900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=6e06cc8d0b140bd8fde4
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e06cc...@syzkaller.appspotmail.com
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 0-....: (10438 ticks this GP) idle=2d6/1/0x4000000000000002 softirq=10893/11059 fqs=2990
rcu: (detected by 1, t=10504 jiffies, g=-827, q=15)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8382 Comm: syz-executor.2 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:23 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:138 [inline]
RIP: 0010:native_write_msr+0x6/0x20 arch/x86/include/asm/msr.h:164
Code: 41 5c c3 48 c1 e2 20 89 cf 49 89 d4 8b 16 49 09 c4 4c 89 e6 e8 fb bb 83 02 4c 89 e0 41 5c c3 0f 1f 44 00 00 89 f9 89 f0 0f 30 <0f> 1f 44 00 00 c3 48 c1 e2 20 89 f6 48 09 d6 31 d2 e9 44 b9 83 02
RSP: 0018:ffff8880ae206c10 EFLAGS: 00000046
RAX: 00000000000000f8 RBX: 0000000000000838 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000000f8 RDI: 0000000000000838
RBP: ffff8880ae21f140 R08: ffffffff8c705018 R09: 000000000000003f
R10: 0000000000000005 R11: 000000000b3eccc3 R12: 00000000000000f8
R13: 0000000000000020 R14: ffff8880ae21f178 R15: ffff8880ae225bc0
FS: 00007efd5bee9700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f66ea519058 CR3: 0000000093e7c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
paravirt_write_msr arch/x86/include/asm/paravirt.h:117 [inline]
native_apic_msr_write+0x53/0x80 arch/x86/include/asm/apic.h:209
apic_write arch/x86/include/asm/apic.h:397 [inline]
lapic_next_event+0x4d/0x80 arch/x86/kernel/apic/apic.c:459
clockevents_program_event+0x254/0x3b0 kernel/time/clockevents.c:344
tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:48
hrtimer_interrupt+0x4c8/0x9a0 kernel/time/hrtimer.c:1534
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x135/0x5d0 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:__orc_find+0x4a/0xf0 arch/x86/kernel/unwind_orc.c:46
Code: 49 89 fd 0f 87 9a 00 00 00 49 bf 00 00 00 00 00 fc ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 49 89 de 49 39 ec 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
RSP: 0018:ffff8880ae206e40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8b4e419c RBX: ffffffff8b4e4198 RCX: ffffffff81ab11ca
RDX: 0000000000000000 RSI: ffffffff8baa8724 RDI: ffffffff8b4e417c
RBP: ffffffff8b4e419c R08: ffffffff8baa875a R09: 0000000000000001
R10: ffff8880ae206fbf R11: 0000000000027e3c R12: ffffffff8b4e419c
R13: ffffffff8b4e417c R14: ffffffff8b4e4198 R15: dffffc0000000000
orc_find arch/x86/kernel/unwind_orc.c:159 [inline]
unwind_next_frame+0x329/0x2430 arch/x86/kernel/unwind_orc.c:429
__save_stack_trace+0x83/0x100 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 mm/slab.c:3397 [inline]
kmem_cache_alloc_trace+0x11a/0x4b0 mm/slab.c:3623
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
nf_bridge_alloc include/net/netfilter/br_netfilter.h:9 [inline]
nf_bridge_unshare net/bridge/br_netfilter_hooks.c:154 [inline]
br_nf_forward_ip+0x34d/0x1620 net/bridge/br_netfilter_hooks.c:577
nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:244 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
__br_forward+0x3c8/0xbb0 net/bridge/br_forward.c:113
deliver_clone net/bridge/br_forward.c:129 [inline]
maybe_deliver+0x2d2/0x3c0 net/bridge/br_forward.c:184
br_flood+0x180/0x4f0 net/bridge/br_forward.c:226
br_handle_frame_finish+0xfcc/0x14d0 net/bridge/br_input.c:167
br_nf_hook_thresh+0x2d7/0x370 net/bridge/br_netfilter_hooks.c:1011
br_nf_pre_routing_finish_ipv6+0x701/0xd90 net/bridge/br_netfilter_ipv6.c:210
NF_HOOK include/linux/netfilter.h:289 [inline]
br_nf_pre_routing_ipv6+0x3f4/0x8ca net/bridge/br_netfilter_ipv6.c:240
br_nf_pre_routing+0x9c7/0x152c net/bridge/br_netfilter_hooks.c:494
nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:244 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
br_handle_frame+0xb24/0x151a net/bridge/br_input.c:306
__netif_receive_skb_core+0x7d5/0x33c0 net/core/dev.c:4876
__netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952
__netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
process_backlog+0x261/0x760 net/core/dev.c:5848
napi_poll net/core/dev.c:6272 [inline]
net_rx_action+0x4e5/0x10d0 net/core/dev.c:6338
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_release+0x429/0x8e0 kernel/locking/lockdep.c:3929
Code: 84 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 c5 03 00 00 48 83 3d ab 94 0b 08 00 0f 84 f0 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 49 c7 04 04 00 00 00
RSP: 0018:ffff8880464c7668 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c713d RBX: ffff888046d12600 RCX: 1ffff11008da25d6
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000286
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 1ffff11008c98ed0
R13: 6a27d0cf5308ad26 R14: ffff888046d12600 R15: 0000000000000002
page_remove_file_rmap mm/rmap.c:1249 [inline]
page_remove_rmap+0x543/0x1230 mm/rmap.c:1300
zap_pte_range mm/memory.c:1350 [inline]
zap_pmd_range mm/memory.c:1452 [inline]
zap_pud_range mm/memory.c:1481 [inline]
zap_p4d_range mm/memory.c:1502 [inline]
unmap_page_range+0x1325/0x2ec0 mm/memory.c:1523
unmap_single_vma+0x198/0x300 mm/memory.c:1568
unmap_vmas+0xa9/0x180 mm/memory.c:1598
exit_mmap+0x2b9/0x530 mm/mmap.c:3093
__mmput kernel/fork.c:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
exit_mm kernel/exit.c:546 [inline]
do_exit+0xb12/0x2d80 kernel/exit.c:874
do_group_exit+0x125/0x320 kernel/exit.c:990
get_signal+0x3f3/0x2270 kernel/signal.c:2588
do_signal+0x8f/0x1690 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x204/0x2c0 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+0x57c/0x670 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: Bad RIP value.
RSP: 002b:00007efd5bee8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000137
RAX: 0000000000001f80 RBX: 0000000000025f00 RCX: 000000000045de59
RDX: 0000000000000002 RSI: 0000000020c22000 RDI: 0000000000000027
RBP: 000000000118bf78 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000020c22fa0 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe68327cbf R14: 00007efd5bee99c0 R15: 000000000118bf2c
net_ratelimit: 7712 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
net_ratelimit: 8016 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
---
This report is generated by a bot. It may contain errors.
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10296607900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=6e06cc8d0b140bd8fde4
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e06cc...@syzkaller.appspotmail.com
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 0-....: (10438 ticks this GP) idle=2d6/1/0x4000000000000002 softirq=10893/11059 fqs=2990
rcu: (detected by 1, t=10504 jiffies, g=-827, q=15)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8382 Comm: syz-executor.2 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:23 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:138 [inline]
RIP: 0010:native_write_msr+0x6/0x20 arch/x86/include/asm/msr.h:164
Code: 41 5c c3 48 c1 e2 20 89 cf 49 89 d4 8b 16 49 09 c4 4c 89 e6 e8 fb bb 83 02 4c 89 e0 41 5c c3 0f 1f 44 00 00 89 f9 89 f0 0f 30 <0f> 1f 44 00 00 c3 48 c1 e2 20 89 f6 48 09 d6 31 d2 e9 44 b9 83 02
RSP: 0018:ffff8880ae206c10 EFLAGS: 00000046
RAX: 00000000000000f8 RBX: 0000000000000838 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000000f8 RDI: 0000000000000838
RBP: ffff8880ae21f140 R08: ffffffff8c705018 R09: 000000000000003f
R10: 0000000000000005 R11: 000000000b3eccc3 R12: 00000000000000f8
R13: 0000000000000020 R14: ffff8880ae21f178 R15: ffff8880ae225bc0
FS: 00007efd5bee9700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f66ea519058 CR3: 0000000093e7c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
paravirt_write_msr arch/x86/include/asm/paravirt.h:117 [inline]
native_apic_msr_write+0x53/0x80 arch/x86/include/asm/apic.h:209
apic_write arch/x86/include/asm/apic.h:397 [inline]
lapic_next_event+0x4d/0x80 arch/x86/kernel/apic/apic.c:459
clockevents_program_event+0x254/0x3b0 kernel/time/clockevents.c:344
tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:48
hrtimer_interrupt+0x4c8/0x9a0 kernel/time/hrtimer.c:1534
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x135/0x5d0 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:__orc_find+0x4a/0xf0 arch/x86/kernel/unwind_orc.c:46
Code: 49 89 fd 0f 87 9a 00 00 00 49 bf 00 00 00 00 00 fc ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 49 89 de 49 39 ec 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
RSP: 0018:ffff8880ae206e40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8b4e419c RBX: ffffffff8b4e4198 RCX: ffffffff81ab11ca
RDX: 0000000000000000 RSI: ffffffff8baa8724 RDI: ffffffff8b4e417c
RBP: ffffffff8b4e419c R08: ffffffff8baa875a R09: 0000000000000001
R10: ffff8880ae206fbf R11: 0000000000027e3c R12: ffffffff8b4e419c
R13: ffffffff8b4e417c R14: ffffffff8b4e4198 R15: dffffc0000000000
orc_find arch/x86/kernel/unwind_orc.c:159 [inline]
unwind_next_frame+0x329/0x2430 arch/x86/kernel/unwind_orc.c:429
__save_stack_trace+0x83/0x100 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 mm/slab.c:3397 [inline]
kmem_cache_alloc_trace+0x11a/0x4b0 mm/slab.c:3623
kmalloc include/linux/slab.h:515 [inline]
kzalloc include/linux/slab.h:709 [inline]
nf_bridge_alloc include/net/netfilter/br_netfilter.h:9 [inline]
nf_bridge_unshare net/bridge/br_netfilter_hooks.c:154 [inline]
br_nf_forward_ip+0x34d/0x1620 net/bridge/br_netfilter_hooks.c:577
nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:244 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
__br_forward+0x3c8/0xbb0 net/bridge/br_forward.c:113
deliver_clone net/bridge/br_forward.c:129 [inline]
maybe_deliver+0x2d2/0x3c0 net/bridge/br_forward.c:184
br_flood+0x180/0x4f0 net/bridge/br_forward.c:226
br_handle_frame_finish+0xfcc/0x14d0 net/bridge/br_input.c:167
br_nf_hook_thresh+0x2d7/0x370 net/bridge/br_netfilter_hooks.c:1011
br_nf_pre_routing_finish_ipv6+0x701/0xd90 net/bridge/br_netfilter_ipv6.c:210
NF_HOOK include/linux/netfilter.h:289 [inline]
br_nf_pre_routing_ipv6+0x3f4/0x8ca net/bridge/br_netfilter_ipv6.c:240
br_nf_pre_routing+0x9c7/0x152c net/bridge/br_netfilter_hooks.c:494
nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:244 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
br_handle_frame+0xb24/0x151a net/bridge/br_input.c:306
__netif_receive_skb_core+0x7d5/0x33c0 net/core/dev.c:4876
__netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952
__netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
process_backlog+0x261/0x760 net/core/dev.c:5848
napi_poll net/core/dev.c:6272 [inline]
net_rx_action+0x4e5/0x10d0 net/core/dev.c:6338
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_release+0x429/0x8e0 kernel/locking/lockdep.c:3929
Code: 84 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 c5 03 00 00 48 83 3d ab 94 0b 08 00 0f 84 f0 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 49 c7 04 04 00 00 00
RSP: 0018:ffff8880464c7668 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c713d RBX: ffff888046d12600 RCX: 1ffff11008da25d6
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000286
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 1ffff11008c98ed0
R13: 6a27d0cf5308ad26 R14: ffff888046d12600 R15: 0000000000000002
page_remove_file_rmap mm/rmap.c:1249 [inline]
page_remove_rmap+0x543/0x1230 mm/rmap.c:1300
zap_pte_range mm/memory.c:1350 [inline]
zap_pmd_range mm/memory.c:1452 [inline]
zap_pud_range mm/memory.c:1481 [inline]
zap_p4d_range mm/memory.c:1502 [inline]
unmap_page_range+0x1325/0x2ec0 mm/memory.c:1523
unmap_single_vma+0x198/0x300 mm/memory.c:1568
unmap_vmas+0xa9/0x180 mm/memory.c:1598
exit_mmap+0x2b9/0x530 mm/mmap.c:3093
__mmput kernel/fork.c:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
exit_mm kernel/exit.c:546 [inline]
do_exit+0xb12/0x2d80 kernel/exit.c:874
do_group_exit+0x125/0x320 kernel/exit.c:990
get_signal+0x3f3/0x2270 kernel/signal.c:2588
do_signal+0x8f/0x1690 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x204/0x2c0 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+0x57c/0x670 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: Bad RIP value.
RSP: 002b:00007efd5bee8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000137
RAX: 0000000000001f80 RBX: 0000000000025f00 RCX: 000000000045de59
RDX: 0000000000000002 RSI: 0000000020c22000 RDI: 0000000000000027
RBP: 000000000118bf78 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000020c22fa0 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe68327cbf R14: 00007efd5bee99c0 R15: 000000000118bf2c
net_ratelimit: 7712 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:9e:cb:d8:ab:5a:72, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
net_ratelimit: 8016 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Sep 15, 2021, 2:30:22 AM9/15/21
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: b172b44fcb17 Linux 4.19.206
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1541e32b300000
kernel config: https://syzkaller.appspot.com/x/.config?x=b9ba3521ce0be3cd
dashboard link: https://syzkaller.appspot.com/bug?extid=6e06cc8d0b140bd8fde4
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=155467fb300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17be010d300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e06cc...@syzkaller.appspotmail.com
Modules linked in:
irq event stamp: 3148605
hardirqs last enabled at (3148604): [<ffffffff81003ce4>] trace_hardirqs_on_thunk+0x1a/0x1c
hardirqs last disabled at (3148605): [<ffffffff81003d00>] trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last enabled at (3090138): [<ffffffff88400678>] __do_softirq+0x678/0x980 kernel/softirq.c:318
softirqs last disabled at (3090141): [<ffffffff81393705>] invoke_softirq kernel/softirq.c:372 [inline]
softirqs last disabled at (3090141): [<ffffffff81393705>] irq_exit+0x215/0x260 kernel/softirq.c:412
CPU: 1 PID: 9722 Comm: syz-executor010 Not tainted 4.19.206-syzkaller #0
Code: c0 74 08 3c 03 0f 8e a0 03 00 00 41 39 2e 0f 85 8f 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48 c1 ea 03 80 3c 02 00 <0f> 85 22 03 00 00 49 8d 7e 08 49 8b 6e 38 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff8880ba107070 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffff11017420e17 RCX: 0000000000000000
RDX: 1ffff11017420e3b RSI: ffff8880ba107000 RDI: ffff8880ba107f80
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8880ba1071ff R11: 0000000000074071 R12: ffff8880ba107fb0
R13: ffff8880ba1071d5 R14: ffff8880ba1071a0 R15: ffffffff8c11cab8
FS: 0000000000bdb300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
skb_clone+0x151/0x3d0 net/core/skbuff.c:1293
deliver_clone net/bridge/br_forward.c:123 [inline]
maybe_deliver+0x277/0x380 net/bridge/br_forward.c:184
br_flood+0x158/0x4d0 net/bridge/br_forward.c:226
br_handle_frame_finish+0xf41/0x1410 net/bridge/br_input.c:167
br_nf_hook_thresh+0x2a3/0x330 net/bridge/br_netfilter_hooks.c:1014
br_nf_pre_routing_finish_ipv6+0x6e3/0xd40 net/bridge/br_netfilter_ipv6.c:210
NF_HOOK include/linux/netfilter.h:289 [inline]
br_nf_pre_routing_ipv6+0x3f4/0x860 net/bridge/br_netfilter_ipv6.c:240
br_nf_pre_routing+0xf05/0x1500 net/bridge/br_netfilter_hooks.c:494
__netif_receive_skb_core+0x929/0x3270 net/core/dev.c:4876
napi_poll net/core/dev.c:6280 [inline]
net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346
__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
</IRQ>
RIP: 0010:page_remove_file_rmap+0x80/0xa30 mm/rmap.c:1232
Code: be 04 00 00 00 e8 e0 9d 08 00 f0 41 ff 4e 54 e8 56 de d2 ff 4c 89 f7 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f e9 f0 14 0f 00 <e8> 3b de d2 ff 49 8d 7e 30 be 04 00 00 00 e8 ad 9d 08 00 f0 41 83
RSP: 0018:ffff88808f6ef708 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff818fb449
RDX: 0000000000000000 RSI: ffff88809b330280 RDI: 0000000000000005
RBP: ffffea00022cdf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffea00022cdf00 R15: 0000000000440000
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
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+0x277/0x2d0 arch/x86/entry/common.c:198
retint_user+0x8/0x18
RIP: 0033:0x439abe
Code: fd d7 c9 0f bc d1 c5 fe 7f 27 c5 fe 7f 6f 20 c5 fe 7f 77 40 c5 fe 7f 7f 60 49 83 c0 1f 49 29 d0 48 8d 7c 17 61 e9 c2 04 00 00 <c5> fe 6f 1e c5 fe 6f 56 20 c5 fd 74 cb c5 fd d7 d1 49 83 f8 21 0f
RSP: 002b:00007ffeb1d00b58 EFLAGS: 00010287
RAX: 00007ffeb1d00b60 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 00000000000003ff RSI: 0000000000000000 RDI: 00007ffeb1d00b60
RBP: 6666666666666667 R08: 00000000000003ff R09: 0000000000f0b5ff
R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffeb1d00b60
R13: 000000000007d5cd R14: 00007ffeb1d00fe0 R15: 00007ffeb1d00fac
net_ratelimit: 365 callbacks suppressed
Code disassembly (best guess):
0: c0 74 08 3c 03 shlb $0x3,0x3c(%rax,%rcx,1)
5: 0f 8e a0 03 00 00 jle 0x3ab
b: 41 39 2e cmp %ebp,(%r14)
e: 0f 85 8f 00 00 00 jne 0xa3
14: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1b: fc ff df
1e: 48 8b 14 24 mov (%rsp),%rdx
22: 48 c1 ea 03 shr $0x3,%rdx
26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
* 2a: 0f 85 22 03 00 00 jne 0x352 <-- trapping instruction
30: 49 8d 7e 08 lea 0x8(%r14),%rdi
34: 49 8b 6e 38 mov 0x38(%r14),%rbp
38: 48 rex.W
39: b8 00 00 00 00 mov $0x0,%eax
3e: 00 fc add %bh,%ah
HEAD commit: b172b44fcb17 Linux 4.19.206
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1541e32b300000
kernel config: https://syzkaller.appspot.com/x/.config?x=b9ba3521ce0be3cd
dashboard link: https://syzkaller.appspot.com/bug?extid=6e06cc8d0b140bd8fde4
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=155467fb300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17be010d300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e06cc...@syzkaller.appspotmail.com
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor010:9722]
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
Modules linked in:
irq event stamp: 3148605
hardirqs last enabled at (3148604): [<ffffffff81003ce4>] trace_hardirqs_on_thunk+0x1a/0x1c
hardirqs last disabled at (3148605): [<ffffffff81003d00>] trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last enabled at (3090138): [<ffffffff88400678>] __do_softirq+0x678/0x980 kernel/softirq.c:318
softirqs last disabled at (3090141): [<ffffffff81393705>] invoke_softirq kernel/softirq.c:372 [inline]
softirqs last disabled at (3090141): [<ffffffff81393705>] irq_exit+0x215/0x260 kernel/softirq.c:412
CPU: 1 PID: 9722 Comm: syz-executor010 Not tainted 4.19.206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unwind_next_frame+0xe6b/0x1400 arch/x86/kernel/unwind_orc.c:572
Code: c0 74 08 3c 03 0f 8e a0 03 00 00 41 39 2e 0f 85 8f 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48 c1 ea 03 80 3c 02 00 <0f> 85 22 03 00 00 49 8d 7e 08 49 8b 6e 38 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff8880ba107070 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffff11017420e17 RCX: 0000000000000000
RDX: 1ffff11017420e3b RSI: ffff8880ba107000 RDI: ffff8880ba107f80
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8880ba1071ff R11: 0000000000074071 R12: ffff8880ba107fb0
R13: ffff8880ba1071d5 R14: ffff8880ba1071a0 R15: ffffffff8c11cab8
FS: 0000000000bdb300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeb1d00f58 CR3: 00000000b2762000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
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+0x122/0x370 mm/slab.c:3559
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553
skb_clone+0x151/0x3d0 net/core/skbuff.c:1293
deliver_clone net/bridge/br_forward.c:123 [inline]
maybe_deliver+0x277/0x380 net/bridge/br_forward.c:184
br_flood+0x158/0x4d0 net/bridge/br_forward.c:226
br_handle_frame_finish+0xf41/0x1410 net/bridge/br_input.c:167
br_nf_hook_thresh+0x2a3/0x330 net/bridge/br_netfilter_hooks.c:1014
br_nf_pre_routing_finish_ipv6+0x6e3/0xd40 net/bridge/br_netfilter_ipv6.c:210
NF_HOOK include/linux/netfilter.h:289 [inline]
br_nf_pre_routing_ipv6+0x3f4/0x860 net/bridge/br_netfilter_ipv6.c:240
br_nf_pre_routing+0xf05/0x1500 net/bridge/br_netfilter_hooks.c:494
nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:244 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
br_handle_frame+0xa60/0x13b0 net/bridge/br_input.c:306
nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:244 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
__netif_receive_skb_core+0x929/0x3270 net/core/dev.c:4876
__netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952
__netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
process_backlog+0x241/0x700 net/core/dev.c:5849
__netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
napi_poll net/core/dev.c:6280 [inline]
net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346
__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
</IRQ>
RIP: 0010:page_remove_file_rmap+0x80/0xa30 mm/rmap.c:1232
Code: be 04 00 00 00 e8 e0 9d 08 00 f0 41 ff 4e 54 e8 56 de d2 ff 4c 89 f7 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f e9 f0 14 0f 00 <e8> 3b de d2 ff 49 8d 7e 30 be 04 00 00 00 e8 ad 9d 08 00 f0 41 83
RSP: 0018:ffff88808f6ef708 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff818fb449
RDX: 0000000000000000 RSI: ffff88809b330280 RDI: 0000000000000005
RBP: ffffea00022cdf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffea00022cdf00 R15: 0000000000440000
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:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
exit_mm kernel/exit.c:549 [inline]
__mmput kernel/fork.c:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
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+0x277/0x2d0 arch/x86/entry/common.c:198
retint_user+0x8/0x18
RIP: 0033:0x439abe
Code: fd d7 c9 0f bc d1 c5 fe 7f 27 c5 fe 7f 6f 20 c5 fe 7f 77 40 c5 fe 7f 7f 60 49 83 c0 1f 49 29 d0 48 8d 7c 17 61 e9 c2 04 00 00 <c5> fe 6f 1e c5 fe 6f 56 20 c5 fd 74 cb c5 fd d7 d1 49 83 f8 21 0f
RSP: 002b:00007ffeb1d00b58 EFLAGS: 00010287
RAX: 00007ffeb1d00b60 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 00000000000003ff RSI: 0000000000000000 RDI: 00007ffeb1d00b60
RBP: 6666666666666667 R08: 00000000000003ff R09: 0000000000f0b5ff
R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffeb1d00b60
R13: 000000000007d5cd R14: 00007ffeb1d00fe0 R15: 00007ffeb1d00fac
net_ratelimit: 365 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
----------------
Code disassembly (best guess):
0: c0 74 08 3c 03 shlb $0x3,0x3c(%rax,%rcx,1)
5: 0f 8e a0 03 00 00 jle 0x3ab
b: 41 39 2e cmp %ebp,(%r14)
e: 0f 85 8f 00 00 00 jne 0xa3
14: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1b: fc ff df
1e: 48 8b 14 24 mov (%rsp),%rdx
22: 48 c1 ea 03 shr $0x3,%rdx
26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
* 2a: 0f 85 22 03 00 00 jne 0x352 <-- trapping instruction
30: 49 8d 7e 08 lea 0x8(%r14),%rdi
34: 49 8b 6e 38 mov 0x38(%r14),%rbp
38: 48 rex.W
39: b8 00 00 00 00 mov $0x0,%eax
3e: 00 fc add %bh,%ah
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