==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
Read of size 8 at addr ffff8880758fd118 by task syz-executor.0/11407
CPU: 1 PID: 11407 Comm: syz-executor.0 Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
tcp_write_timer_handler+0x1f7/0x9c0 net/ipv4/tcp_timer.c:626
tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:646
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1737
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:arch_atomic64_try_cmpxchg arch/x86/include/asm/atomic64_64.h:190 [inline]
RIP: 0010:arch_atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-long.h:443 [inline]
RIP: 0010:atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1669 [inline]
RIP: 0010:rwsem_write_trylock kernel/locking/rwsem.c:255 [inline]
RIP: 0010:__down_write_common kernel/locking/rwsem.c:1283 [inline]
RIP: 0010:__down_write kernel/locking/rwsem.c:1293 [inline]
RIP: 0010:down_write+0xd9/0x170 kernel/locking/rwsem.c:1542
Code: a6 f7 48 c7 44 24 20 00 00 00 00 4c 89 ef be 08 00 00 00 e8 19 65 a6 f7 4c 89 f7 be 08 00 00 00 e8 0c 65 a6 f7 42 80 3c 3b 00 <74> 08 4c 89 f7 e8 5d 63 a6 f7 48 8b 44 24 20 b9 01 00 00 00 f0 49
RSP: 0018:ffffc90002f8f000 EFLAGS: 00000246
RAX: 1a9322131e0f5301 RBX: 1ffff920005f1e04 RCX: ffffffff8a22d544
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90002f8f020
RBP: ffffc90002f8f090 R08: dffffc0000000000 R09: fffff520005f1e05
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920005f1e00
R13: ffffffff8ca4d5e0 R14: ffffc90002f8f020 R15: dffffc0000000000
kernfs_drain fs/kernfs/dir.c:494 [inline]
__kernfs_remove+0x75b/0xc80 fs/kernfs/dir.c:1358
kernfs_remove_by_name_ns+0x91/0x100 fs/kernfs/dir.c:1552
kernfs_remove_by_name include/linux/kernfs.h:598 [inline]
remove_files fs/sysfs/group.c:28 [inline]
sysfs_remove_group+0xfa/0x2a0 fs/sysfs/group.c:289
sysfs_remove_groups+0x50/0xa0 fs/sysfs/group.c:313
device_remove_groups drivers/base/core.c:2480 [inline]
device_remove_attrs+0xc2/0x140 drivers/base/core.c:2680
device_del+0x6da/0xbd0 drivers/base/core.c:3581
unregister_netdevice_many+0x13a6/0x18f0 net/core/dev.c:11092
unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10998
unregister_netdevice include/linux/netdevice.h:3012 [inline]
lapbeth_free_device drivers/net/wan/lapbether.c:434 [inline]
lapbeth_device_event+0x7d1/0x950 drivers/net/wan/lapbether.c:469
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391
call_netdevice_notifiers_info net/core/dev.c:1998 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2010 [inline]
call_netdevice_notifiers net/core/dev.c:2024 [inline]
unregister_netdevice_many+0xf1b/0x18f0 net/core/dev.c:11065
unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10998
unregister_netdevice include/linux/netdevice.h:3012 [inline]
nsim_destroy+0x44/0x140 drivers/net/netdevsim/netdev.c:382
__nsim_dev_port_del+0x153/0x1b0 drivers/net/netdevsim/dev.c:1352
nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1365 [inline]
nsim_dev_reload_destroy+0x15e/0x240 drivers/net/netdevsim/dev.c:1564
nsim_dev_remove+0x59/0x100 drivers/net/netdevsim/dev.c:1580
__device_release_driver drivers/base/dd.c:1227 [inline]
device_release_driver_internal+0x4cb/0x7f0 drivers/base/dd.c:1262
bus_remove_device+0x2e5/0x400 drivers/base/bus.c:529
device_del+0x6e2/0xbd0 drivers/base/core.c:3582
device_unregister+0x1c/0xc0 drivers/base/core.c:3615
nsim_bus_dev_del drivers/net/netdevsim/bus.c:454 [inline]
del_device_store+0x321/0x470 drivers/net/netdevsim/bus.c:354
kernfs_fop_write_iter+0x3a2/0x4f0 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2103 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0xacf/0xe50 fs/read_write.c:594
ksys_write+0x1a2/0x2c0 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fd1ab59ceef
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48
RSP: 002b:00007ffd4e68c100 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fd1ab59ceef
RDX: 0000000000000001 RSI: 00007ffd4e68c150 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007ffd4e68c0a0
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd1ab6468b6
R13: 00007ffd4e68c150 R14: 0000000000000000 R15: 00007ffd4e68c820
Allocated by task 10055:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
ksys_unshare+0x580/0xb20 kernel/fork.c:3094
__do_sys_unshare kernel/fork.c:3168 [inline]
__se_sys_unshare kernel/fork.c:3166 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3166
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Freed by task 1242:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
net_free net/core/net_namespace.c:434 [inline]
cleanup_net+0xab5/0xb60 net/core/net_namespace.c:617
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306
worker_thread+0xaca/0x1280 kernel/workqueue.c:2453
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
The buggy address belongs to the object at ffff8880758fcec0
which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
6464-byte region [ffff8880758fcec0, ffff8880758fe800)
The buggy address belongs to the page:
page:ffffea0001d63e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880758fb480 pfn:0x758f8
head:ffffea0001d63e00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff8880159ec441
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea00008fde00 0000000200000002 ffff888011dc63c0
raw: ffff8880758fb480 0000000080040003 00000001ffffffff ffff8880159ec441
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 4425, ts 150606339395, free_ts 150581915326
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
copy_namespaces+0x365/0x3b0 kernel/nsproxy.c:178
copy_process+0x1841/0x3ef0 kernel/fork.c:2201
kernel_clone+0x210/0x960 kernel/fork.c:2601
__do_sys_clone kernel/fork.c:2718 [inline]
__se_sys_clone kernel/fork.c:2702 [inline]
__x64_sys_clone+0x23f/0x290 kernel/fork.c:2702
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
vm_area_dup+0x1e/0xb0 kernel/fork.c:357
__split_vma+0xb4/0x4a0 mm/mmap.c:2729
mprotect_fixup+0x675/0x7d0 mm/mprotect.c:477
do_mprotect_pkey+0x75b/0xa50 mm/mprotect.c:636
__do_sys_mprotect mm/mprotect.c:662 [inline]
__se_sys_mprotect mm/mprotect.c:659 [inline]
__x64_sys_mprotect+0x7c/0x90 mm/mprotect.c:659
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff8880758fd000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880758fd080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880758fd100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880758fd180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880758fd200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: a6 cmpsb %es:(%rdi),%ds:(%rsi)
1: f7 48 c7 44 24 20 00 testl $0x202444,-0x39(%rax)
8: 00 00 add %al,(%rax)
a: 00 4c 89 ef add %cl,-0x11(%rcx,%rcx,4)
e: be 08 00 00 00 mov $0x8,%esi
13: e8 19 65 a6 f7 callq 0xf7a66531
18: 4c 89 f7 mov %r14,%rdi
1b: be 08 00 00 00 mov $0x8,%esi
20: e8 0c 65 a6 f7 callq 0xf7a66531
25: 42 80 3c 3b 00 cmpb $0x0,(%rbx,%r15,1)
* 2a: 74 08 je 0x34 <-- trapping instruction
2c: 4c 89 f7 mov %r14,%rdi
2f: e8 5d 63 a6 f7 callq 0xf7a66391
34: 48 8b 44 24 20 mov 0x20(%rsp),%rax
39: b9 01 00 00 00 mov $0x1,%ecx
3e: f0 lock
3f: 49 rex.WB