==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
Read of size 8 at addr ffff88807082a380 by task kworker/u4:6/4040
CPU: 1 PID: 4040 Comm: kworker/u4:6 Not tainted 5.18.0-rc3-syzkaller-00007-g559089e0a93d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
tcp_write_timer_handler+0x5e6/0xbc0 net/ipv4/tcp_timer.c:622
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1737
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1750
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_is_held_type+0xff/0x140 kernel/locking/lockdep.c:5689
Code: 00 00 b8 ff ff ff ff 65 0f c1 05 c4 25 a4 76 83 f8 01 75 29 9c 58 f6 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 ed eb b9 0f 0b 48
RSP: 0018:ffffc900034174d8 EFLAGS: 00000286
RAX: 0000000000000046 RBX: 0000000000000008 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8bd7f140 R08: 0000000000000000 R09: ffff88807d0e00ef
R10: ffffed100fa1c01d R11: 0000000000000001 R12: ffff8880167a6280
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff8880167a6df8
lock_is_held include/linux/lockdep.h:283 [inline]
__might_resched+0x21/0x2c0 kernel/sched/core.c:9701
kernfs_drain fs/kernfs/dir.c:476 [inline]
__kernfs_remove+0x491/0xb20 fs/kernfs/dir.c:1376
kernfs_remove_by_name_ns+0xa8/0x110 fs/kernfs/dir.c:1574
kernfs_remove_by_name include/linux/kernfs.h:558 [inline]
remove_files+0x96/0x1c0 fs/sysfs/group.c:28
sysfs_remove_group+0x87/0x170 fs/sysfs/group.c:288
sysfs_remove_groups fs/sysfs/group.c:312 [inline]
sysfs_remove_groups+0x5c/0xa0 fs/sysfs/group.c:304
device_remove_groups drivers/base/core.c:2478 [inline]
device_remove_attrs+0x134/0x170 drivers/base/core.c:2684
device_del+0x4eb/0xc80 drivers/base/core.c:3591
unregister_netdevice_many+0xd22/0x1890 net/core/dev.c:10778
unregister_netdevice_queue net/core/dev.c:10683 [inline]
unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10673
unregister_netdevice include/linux/netdevice.h:2954 [inline]
nsim_destroy+0x3f/0x190 drivers/net/netdevsim/netdev.c:382
__nsim_dev_port_del+0x191/0x250 drivers/net/netdevsim/dev.c:1427
nsim_dev_port_del_all+0x85/0xe0 drivers/net/netdevsim/dev.c:1440
nsim_dev_reload_destroy+0x11f/0x420 drivers/net/netdevsim/dev.c:1659
nsim_dev_reload_down+0xdf/0x180 drivers/net/netdevsim/dev.c:962
devlink_reload+0x1c2/0x6b0 net/core/devlink.c:4070
devlink_pernet_pre_exit+0x17e/0x220 net/core/devlink.c:11476
ops_pre_exit_list net/core/net_namespace.c:152 [inline]
cleanup_net+0x451/0xb00 net/core/net_namespace.c:582
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Allocated by task 3890:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x85/0xb0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:749 [inline]
slab_alloc mm/slab.c:3316 [inline]
__kmem_cache_alloc_lru mm/slab.c:3493 [inline]
kmem_cache_alloc+0x265/0x560 mm/slab.c:3513
kmem_cache_zalloc include/linux/slab.h:704 [inline]
net_alloc net/core/net_namespace.c:403 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3132
__do_sys_unshare kernel/fork.c:3203 [inline]
__se_sys_unshare kernel/fork.c:3201 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 4040:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x13d/0x180 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
__cache_free mm/slab.c:3439 [inline]
kmem_cache_free.part.0+0xa9/0x240 mm/slab.c:3749
net_free net/core/net_namespace.c:432 [inline]
net_free net/core/net_namespace.c:428 [inline]
cleanup_net+0x8ba/0xb00 net/core/net_namespace.c:615
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
__kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348
insert_work+0x48/0x350 kernel/workqueue.c:1358
__queue_work+0x62e/0x1140 kernel/workqueue.c:1517
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1461 [inline]
__run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1737
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1752
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
Second to last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
__kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348
insert_work+0x48/0x350 kernel/workqueue.c:1358
__queue_work+0x62e/0x1140 kernel/workqueue.c:1517
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1461 [inline]
__run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1737
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1752
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
The buggy address belongs to the object at ffff88807082a0c0
which belongs to the cache net_namespace of size 6784
The buggy address is located 704 bytes inside of
6784-byte region [ffff88807082a0c0, ffff88807082bb40)
The buggy address belongs to the physical page:
page:ffffea0001c20a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7082a
head:ffffea0001c20a80 order:1 compound_mapcount:0 compound_pincount:0
memcg:ffff88801b9af541
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001d17008 ffffea0001f99d88 ffff8880114d3600
raw: 0000000000000000 ffff88807082a0c0 0000000100000001 ffff88801b9af541
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 3890, tgid 3890 (syz-executor.5), ts 67607864893, free_ts 67594728863
prep_new_page mm/page_alloc.c:2441 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
__alloc_pages_node include/linux/gfp.h:587 [inline]
kmem_getpages mm/slab.c:1378 [inline]
cache_grow_begin+0x75/0x350 mm/slab.c:2584
cache_alloc_refill+0x27f/0x380 mm/slab.c:2957
____cache_alloc mm/slab.c:3040 [inline]
____cache_alloc mm/slab.c:3023 [inline]
__do_cache_alloc mm/slab.c:3267 [inline]
slab_alloc mm/slab.c:3309 [inline]
__kmem_cache_alloc_lru mm/slab.c:3493 [inline]
kmem_cache_alloc+0x450/0x560 mm/slab.c:3513
kmem_cache_zalloc include/linux/slab.h:704 [inline]
net_alloc net/core/net_namespace.c:403 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3132
__do_sys_unshare kernel/fork.c:3203 [inline]
__se_sys_unshare kernel/fork.c:3201 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1356 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
free_unref_page_prepare mm/page_alloc.c:3328 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
slab_destroy mm/slab.c:1630 [inline]
slabs_destroy+0x89/0xc0 mm/slab.c:1650
cache_flusharray mm/slab.c:3411 [inline]
___cache_free+0x34e/0x670 mm/slab.c:3474
qlink_free mm/kasan/quarantine.c:157 [inline]
qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:749 [inline]
slab_alloc_node mm/slab.c:3253 [inline]
kmem_cache_alloc_node+0x2ea/0x590 mm/slab.c:3607
__alloc_skb+0x215/0x340 net/core/skbuff.c:414
alloc_skb include/linux/skbuff.h:1300 [inline]
alloc_skb_with_frags+0x93/0x730 net/core/skbuff.c:5995
sock_alloc_send_pskb+0x793/0x920 net/core/sock.c:2600
unix_dgram_sendmsg+0x414/0x1a90 net/unix/af_unix.c:1896
sock_sendmsg_nosec net/socket.c:705 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:725
sock_write_iter+0x283/0x3c0 net/socket.c:1061
call_write_iter include/linux/fs.h:2050 [inline]
new_sync_write+0x38a/0x560 fs/read_write.c:504
vfs_write+0x7c0/0xac0 fs/read_write.c:591
Memory state around the buggy address:
ffff88807082a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807082a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807082a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807082a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807082a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: b8 ff ff ff ff mov $0xffffffff,%eax
7: 65 0f c1 05 c4 25 a4 xadd %eax,%gs:0x76a425c4(%rip) # 0x76a425d3
e: 76
f: 83 f8 01 cmp $0x1,%eax
12: 75 29 jne 0x3d
14: 9c pushfq
15: 58 pop %rax
16: f6 c4 02 test $0x2,%ah
19: 75 3d jne 0x58
1b: 48 f7 04 24 00 02 00 testq $0x200,(%rsp)
22: 00
23: 74 01 je 0x26
25: fb sti
26: 48 83 c4 08 add $0x8,%rsp
* 2a: 44 89 e8 mov %r13d,%eax <-- trapping instruction
2d: 5b pop %rbx
2e: 5d pop %rbp
2f: 41 5c pop %r12
31: 41 5d pop %r13
33: 41 5e pop %r14
35: 41 5f pop %r15
37: c3 retq
38: 45 31 ed xor %r13d,%r13d
3b: eb b9 jmp 0xfffffff6
3d: 0f 0b ud2
3f: 48 rex.W