==================================================================
BUG: KASAN: use-after-free in inet_twsk_kill+0x62/0x670 net/ipv4/inet_timewait_sock.c:52
Read of size 8 at addr ffff88811a8b8340 by task syz.4.4055/13620
CPU: 0 PID: 13620 Comm: syz.4.4055 Tainted: G W 6.1.141-syzkaller-00036-g7011769d221c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
print_address_description+0x71/0x210 mm/kasan/report.c:316
print_report+0x4a/0x60 mm/kasan/report.c:427
kasan_report+0x122/0x150 mm/kasan/report.c:531
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351
inet_twsk_kill+0x62/0x670 net/ipv4/inet_timewait_sock.c:52
tw_timer_handler+0x1c/0x20 net/ipv4/inet_timewait_sock.c:175
call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1510
expire_timers kernel/time/timer.c:1555 [inline]
__run_timers+0x639/0x9a0 kernel/time/timer.c:1826
run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1839
handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:215
Code: 8b 3d 4c 2a 02 06 48 89 de e8 d4 9f 43 00 5b 5d c3 00 90 90 90 90 90 90 90 90 90 90 90 b8 0c 67 40 a5 55 48 89 e5 48 8b 45 08 <65> 48 8b 0d 40 76 92 7e 65 8b 15 41 76 92 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000a26938 EFLAGS: 00000246
RAX: ffffffff81bad1ad RBX: 0000000008140dca RCX: 0000000000080000
RDX: ffffc90006fd7000 RSI: 000000000007ffff RDI: ffffea00052fd4c0
RBP: ffffc90000a26938 R08: ffff8881f5c00000 R09: 000000000006c864
R10: 00000000495ab04d R11: 0000000000000001 R12: 0000000006bf00fa
R13: 0000000000000001 R14: ffffea00052fd4c0 R15: dffffc0000000000
page_ext_get+0x1d/0x150 mm/page_ext.c:158
__set_page_owner+0x2a/0x60 mm/page_owner.c:212
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637
prep_new_page+0x1c/0x110 mm/page_alloc.c:2644
get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4539
__alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5850
__folio_alloc+0x12/0x40 mm/page_alloc.c:5882
__folio_alloc_node include/linux/gfp.h:245 [inline]
folio_alloc include/linux/gfp.h:274 [inline]
alloc_page_vma include/linux/gfp.h:283 [inline]
wp_page_copy+0x255/0x15b0 mm/memory.c:3204
do_wp_page+0x9f2/0xfc0 mm/memory.c:-1
handle_pte_fault mm/memory.c:5189 [inline]
__handle_mm_fault mm/memory.c:5313 [inline]
handle_mm_fault+0x10e4/0x2640 mm/memory.c:5453
do_user_addr_fault+0x63b/0x1050 arch/x86/mm/fault.c:1374
handle_page_fault arch/x86/mm/fault.c:1466 [inline]
exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522
asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a27380 EFLAGS: 00050202
RAX: ffffffff82614701 RBX: 000000000000555a RCX: 0000000000002b1a
RDX: 000000000000555a RSI: ffff8881153e2a40 RDI: 0000200000f4e000
RBP: ffffc90000a273b0 R08: dffffc0000000000 R09: ffffed1022a7caac
R10: 0000000000000000 R11: 0000000000000aa8 R12: 00007fffffff9aa6
R13: 0000000000005500 R14: ffff8881153e0000 R15: 0000200000f4b5c0
_copy_to_iter+0x3f0/0xe50 lib/iov_iter.c:527
copy_to_iter include/linux/uio.h:179 [inline]
simple_copy_to_iter+0x50/0x70 net/core/datagram.c:521
__skb_datagram_iter+0x2fd/0x730 net/core/datagram.c:449
skb_copy_datagram_iter+0x40/0x150 net/core/datagram.c:535
skb_copy_datagram_msg include/linux/skbuff.h:3975 [inline]
tcp_recvmsg_locked+0x916/0x23b0 net/ipv4/tcp.c:2620
tcp_recvmsg+0x20e/0x810 net/ipv4/tcp.c:2698
inet_recvmsg+0x13b/0x470 net/ipv4/af_inet.c:875
____sys_recvmsg+0x2a0/0x590 net/socket.c:-1
___sys_recvmsg+0x1b2/0x510 net/socket.c:2770
__sys_recvmsg net/socket.c:2800 [inline]
__do_sys_recvmsg net/socket.c:2810 [inline]
__se_sys_recvmsg net/socket.c:2807 [inline]
__x64_sys_recvmsg+0x1ed/0x2c0 net/socket.c:2807
x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:48
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f251678e929
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f251763e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f25169b6080 RCX: 00007f251678e929
RDX: 0000000000000104 RSI: 0000200000001500 RDI: 0000000000000003
RBP: 00007f2516810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f25169b6080 R15: 00007ffe25651648
Allocated by task 3013:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
__kasan_slab_alloc+0x72/0x80 mm/kasan/common.c:333
kasan_slab_alloc include/linux/kasan.h:202 [inline]
slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
slab_alloc_node mm/slub.c:3421 [inline]
slab_alloc mm/slub.c:3431 [inline]
__kmem_cache_alloc_lru mm/slub.c:3438 [inline]
kmem_cache_alloc+0x16e/0x330 mm/slub.c:3447
kmem_cache_zalloc include/linux/slab.h:689 [inline]
net_alloc net/core/net_namespace.c:413 [inline]
copy_net_ns+0x145/0x5c0 net/core/net_namespace.c:468
create_new_namespaces+0x3a2/0x660 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x120/0x170 kernel/nsproxy.c:226
ksys_unshare+0x4ac/0x7b0 kernel/fork.c:3388
__do_sys_unshare kernel/fork.c:3459 [inline]
__se_sys_unshare kernel/fork.c:3457 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3457
x64_sys_call+0x767/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:273
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 326:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x31/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x132/0x180 mm/kasan/common.c:241
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
kasan_slab_free include/linux/kasan.h:178 [inline]
slab_free_hook mm/slub.c:1745 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1771
slab_free mm/slub.c:3686 [inline]
kmem_cache_free+0x12d/0x300 mm/slub.c:3711
net_free net/core/net_namespace.c:442 [inline]
cleanup_net+0xa58/0xb00 net/core/net_namespace.c:625
process_one_work+0x71f/0xc40 kernel/workqueue.c:2299
worker_thread+0xa29/0x11f0 kernel/workqueue.c:2446
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
insert_work+0x51/0x300 kernel/workqueue.c:1368
__queue_work+0x9b1/0xd30 kernel/workqueue.c:1527
delayed_work_timer_fn+0x61/0x80 kernel/workqueue.c:1653
call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1510
expire_timers kernel/time/timer.c:1550 [inline]
__run_timers+0x667/0x9a0 kernel/time/timer.c:1826
run_timer_softirq+0xb8/0xf0 kernel/time/timer.c:1841
handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
insert_work+0x51/0x300 kernel/workqueue.c:1368
__queue_work+0x9b1/0xd30 kernel/workqueue.c:1527
delayed_work_timer_fn+0x61/0x80 kernel/workqueue.c:1653
call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1510
expire_timers kernel/time/timer.c:1550 [inline]
__run_timers+0x667/0x9a0 kernel/time/timer.c:1826
run_timer_softirq+0xb8/0xf0 kernel/time/timer.c:1841
handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
The buggy address belongs to the object at ffff88811a8b8000
which belongs to the cache net_namespace of size 4224
The buggy address is located 832 bytes inside of
4224-byte region [ffff88811a8b8000, ffff88811a8b9080)
The buggy address belongs to the physical page:
page:ffffea00046a2e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811a8bd780 pfn:0x11a8b8
head:ffffea00046a2e00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000001 ffff8881002adc80
raw: ffff88811a8bd780 0000000080070002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2775, tgid 2768 (syz.0.764), ts 225552185926, free_ts 206891727015
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637
prep_new_page+0x1c/0x110 mm/page_alloc.c:2644
get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4539
__alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5850
alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
allocate_slab mm/slub.c:1962 [inline]
new_slab+0x98/0x3d0 mm/slub.c:2015
___slab_alloc+0x6f6/0xb50 mm/slub.c:3203
__slab_alloc+0x5e/0xa0 mm/slub.c:3302
slab_alloc_node mm/slub.c:3387 [inline]
slab_alloc mm/slub.c:3431 [inline]
__kmem_cache_alloc_lru mm/slub.c:3438 [inline]
kmem_cache_alloc+0x1b0/0x330 mm/slub.c:3447
kmem_cache_zalloc include/linux/slab.h:689 [inline]
net_alloc net/core/net_namespace.c:413 [inline]
copy_net_ns+0x145/0x5c0 net/core/net_namespace.c:468
create_new_namespaces+0x3a2/0x660 kernel/nsproxy.c:110
copy_namespaces+0x1d1/0x220 kernel/nsproxy.c:178
copy_process+0x12e0/0x3420 kernel/fork.c:2459
kernel_clone+0x23a/0x810 kernel/fork.c:2863
__do_sys_clone kernel/fork.c:3006 [inline]
__se_sys_clone kernel/fork.c:2990 [inline]
__x64_sys_clone+0x168/0x1b0 kernel/fork.c:2990
x64_sys_call+0x990/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1545 [inline]
free_pcp_prepare mm/page_alloc.c:1619 [inline]
free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3581
free_unref_page+0x8f/0x530 mm/page_alloc.c:3677
free_the_page mm/page_alloc.c:830 [inline]
__free_pages+0x67/0x100 mm/page_alloc.c:5939
__free_slab+0xca/0x1a0 mm/slub.c:2039
free_slab mm/slub.c:2054 [inline]
discard_slab+0x29/0x40 mm/slub.c:2060
__slab_free+0x201/0x280 mm/slub.c:3599
do_slab_free mm/slub.c:3640 [inline]
___cache_free+0xbf/0xd0 mm/slub.c:3696
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:310
kasan_slab_alloc include/linux/kasan.h:202 [inline]
slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
slab_alloc_node mm/slub.c:3421 [inline]
slab_alloc mm/slub.c:3431 [inline]
__kmem_cache_alloc_lru mm/slub.c:3438 [inline]
kmem_cache_alloc+0x16e/0x330 mm/slub.c:3447
vm_area_dup+0x27/0x280 kernel/fork.c:510
dup_mmap kernel/fork.c:723 [inline]
dup_mm kernel/fork.c:1641 [inline]
copy_mm+0xb45/0x1a10 kernel/fork.c:1693
copy_process+0x12b4/0x3420 kernel/fork.c:2456
kernel_clone+0x23a/0x810 kernel/fork.c:2863
Memory state around the buggy address:
ffff88811a8b8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811a8b8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811a8b8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88811a8b8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811a8b8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 0 PID: 13620 at lib/refcount.c:31 refcount_warn_saturate+0xe8/0x1a0 lib/refcount.c:31
Modules linked in:
CPU: 0 PID: 13620 Comm: syz.4.4055 Tainted: G B W 6.1.141-syzkaller-00036-g7011769d221c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:refcount_warn_saturate+0xe8/0x1a0 lib/refcount.c:31
Code: 05 01 0f 85 99 00 00 00 e8 95 b5 0c ff 5b 41 5e 5d c3 e8 8b b5 0c ff c6 05 ed ab 0b 05 01 48 c7 c7 e0 a1 a9 85 e8 38 fb dd fe <0f> 0b eb df e8 6f b5 0c ff c6 05 cf ab 0b 05 01 48 c7 c7 20 a1 a9
RSP: 0018:ffffc90000007cb0 EFLAGS: 00010246
RAX: 9f00e12c912fe600 RBX: 0000000000000004 RCX: ffff888113ccd100
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90000007cc0 R08: dffffc0000000000 R09: fffff52000000f11
R10: fffff52000000f11 R11: 1ffff92000000f10 R12: ffff88810cec1070
R13: dffffc0000000000 R14: 0000000000000004 R15: 0000000000000001
FS: 00007f251763e6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000f4e000 CR3: 000000011616a000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_dec include/linux/refcount.h:344 [inline]
refcount_dec include/linux/refcount.h:359 [inline]
inet_twsk_kill+0x533/0x670 net/ipv4/inet_timewait_sock.c:72
tw_timer_handler+0x1c/0x20 net/ipv4/inet_timewait_sock.c:175
call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1510
expire_timers kernel/time/timer.c:1555 [inline]
__run_timers+0x639/0x9a0 kernel/time/timer.c:1826
run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1839
handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:215
Code: 8b 3d 4c 2a 02 06 48 89 de e8 d4 9f 43 00 5b 5d c3 00 90 90 90 90 90 90 90 90 90 90 90 b8 0c 67 40 a5 55 48 89 e5 48 8b 45 08 <65> 48 8b 0d 40 76 92 7e 65 8b 15 41 76 92 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000a26938 EFLAGS: 00000246
RAX: ffffffff81bad1ad RBX: 0000000008140dca RCX: 0000000000080000
RDX: ffffc90006fd7000 RSI: 000000000007ffff RDI: ffffea00052fd4c0
RBP: ffffc90000a26938 R08: ffff8881f5c00000 R09: 000000000006c864
R10: 00000000495ab04d R11: 0000000000000001 R12: 0000000006bf00fa
R13: 0000000000000001 R14: ffffea00052fd4c0 R15: dffffc0000000000
page_ext_get+0x1d/0x150 mm/page_ext.c:158
__set_page_owner+0x2a/0x60 mm/page_owner.c:212
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637
prep_new_page+0x1c/0x110 mm/page_alloc.c:2644
get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4539
__alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5850
__folio_alloc+0x12/0x40 mm/page_alloc.c:5882
__folio_alloc_node include/linux/gfp.h:245 [inline]
folio_alloc include/linux/gfp.h:274 [inline]
alloc_page_vma include/linux/gfp.h:283 [inline]
wp_page_copy+0x255/0x15b0 mm/memory.c:3204
do_wp_page+0x9f2/0xfc0 mm/memory.c:-1
handle_pte_fault mm/memory.c:5189 [inline]
__handle_mm_fault mm/memory.c:5313 [inline]
handle_mm_fault+0x10e4/0x2640 mm/memory.c:5453
do_user_addr_fault+0x63b/0x1050 arch/x86/mm/fault.c:1374
handle_page_fault arch/x86/mm/fault.c:1466 [inline]
exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522
asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a27380 EFLAGS: 00050202
RAX: ffffffff82614701 RBX: 000000000000555a RCX: 0000000000002b1a
RDX: 000000000000555a RSI: ffff8881153e2a40 RDI: 0000200000f4e000
RBP: ffffc90000a273b0 R08: dffffc0000000000 R09: ffffed1022a7caac
R10: 0000000000000000 R11: 0000000000000aa8 R12: 00007fffffff9aa6
R13: 0000000000005500 R14: ffff8881153e0000 R15: 0000200000f4b5c0
_copy_to_iter+0x3f0/0xe50 lib/iov_iter.c:527
copy_to_iter include/linux/uio.h:179 [inline]
simple_copy_to_iter+0x50/0x70 net/core/datagram.c:521
__skb_datagram_iter+0x2fd/0x730 net/core/datagram.c:449
skb_copy_datagram_iter+0x40/0x150 net/core/datagram.c:535
skb_copy_datagram_msg include/linux/skbuff.h:3975 [inline]
tcp_recvmsg_locked+0x916/0x23b0 net/ipv4/tcp.c:2620
tcp_recvmsg+0x20e/0x810 net/ipv4/tcp.c:2698
inet_recvmsg+0x13b/0x470 net/ipv4/af_inet.c:875
____sys_recvmsg+0x2a0/0x590 net/socket.c:-1
___sys_recvmsg+0x1b2/0x510 net/socket.c:2770
__sys_recvmsg net/socket.c:2800 [inline]
__do_sys_recvmsg net/socket.c:2810 [inline]
__se_sys_recvmsg net/socket.c:2807 [inline]
__x64_sys_recvmsg+0x1ed/0x2c0 net/socket.c:2807
x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:48
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f251678e929
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f251763e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f25169b6080 RCX: 00007f251678e929
RDX: 0000000000000104 RSI: 0000200000001500 RDI: 0000000000000003
RBP: 00007f2516810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f25169b6080 R15: 00007ffe25651648
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 8b 3d 4c 2a 02 06 mov 0x6022a4c(%rip),%edi # 0x6022a52
6: 48 89 de mov %rbx,%rsi
9: e8 d4 9f 43 00 call 0x439fe2
e: 5b pop %rbx
f: 5d pop %rbp
10: c3 ret
11: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax)
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: b8 0c 67 40 a5 mov $0xa540670c,%eax
22: 55 push %rbp
23: 48 89 e5 mov %rsp,%rbp
26: 48 8b 45 08 mov 0x8(%rbp),%rax
* 2a: 65 48 8b 0d 40 76 92 mov %gs:0x7e927640(%rip),%rcx # 0x7e927672 <-- trapping instruction
31: 7e
32: 65 8b 15 41 76 92 7e mov %gs:0x7e927641(%rip),%edx # 0x7e92767a
39: 81 e2 00 01 ff 00 and $0xff0100,%edx
3f: 74 .byte 0x74