==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:505
Read of size 8 at addr ffff888049e79e40 by task syz-executor.4/19788
CPU: 1 PID: 19788 Comm: syz-executor.4 Not tainted 5.19.0-rc3-syzkaller-00644-gd521bc0a0f7c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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/0x495 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:505
tcp_write_timer_handler net/ipv4/tcp_timer.c:616 [inline]
tcp_write_timer_handler+0x4de/0x9f0 net/ipv4/tcp_timer.c:590
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:633
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1519 [inline]
__run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1790
__run_timers kernel/time/timer.c:1768 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
__do_softirq+0x29b/0x9c2 kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline]
RIP: 0010:folio_memcg_lock+0x19b/0x6c0 mm/memcontrol.c:2057
Code: e2 03 00 00 4d 85 ed 74 01 fb 4c 8d ab 80 11 00 00 be 04 00 00 00 4c 89 ef e8 41 d2 f8 ff 4c 89 e8 48 c1 e8 03 42 0f b6 14 20 <4c> 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3c 04 00 00 8b
RSP: 0018:ffffc90002def6b8 EFLAGS: 00000a06
RAX: 1ffff11027fcc230 RBX: ffff88813fe60000 RCX: ffffffff81cea0ff
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88813fe61180
RBP: ffffc90002def708 R08: 0000000000000000 R09: ffff88813fe61183
R10: ffffed1027fcc230 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88813fe61180 R14: ffffea0001d1aa38 R15: ffffea0001d1aa08
page_remove_rmap+0x27/0x1510 mm/rmap.c:1429
zap_pte_range mm/memory.c:1446 [inline]
zap_pmd_range mm/memory.c:1567 [inline]
zap_pud_range mm/memory.c:1596 [inline]
zap_p4d_range mm/memory.c:1617 [inline]
unmap_page_range+0x1014/0x3710 mm/memory.c:1638
unmap_single_vma+0x196/0x360 mm/memory.c:1686
unmap_vmas+0x18c/0x310 mm/memory.c:1723
exit_mmap+0x1c4/0x4a0 mm/mmap.c:3162
__mmput+0x122/0x4b0 kernel/fork.c:1187
mmput+0x56/0x60 kernel/fork.c:1208
exit_mm kernel/exit.c:510 [inline]
do_exit+0xa12/0x2a00 kernel/exit.c:782
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
get_signal+0x2542/0x2600 kernel/signal.c:2857
arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f96c1489109
Code: Unable to access opcode bytes at RIP 0x7f96c14890df.
RSP: 002b:00007f96c25cf218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f96c159bf68 RCX: 00007f96c1489109
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f96c159bf6c
RBP: 00007f96c159bf60 R08: 00007ffcbb557080 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f96c159bf6c
R13: 00007ffcbb53efbf R14: 00007f96c25cf300 R15: 0000000000022000
Allocated by task 6872:
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+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
slab_alloc_node mm/slub.c:3243 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3268
kmem_cache_zalloc include/linux/slab.h:723 [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:3165
__do_sys_unshare kernel/fork.c:3236 [inline]
__se_sys_unshare kernel/fork.c:3234 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3234
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Freed by task 8:
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+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1754 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
slab_free mm/slub.c:3536 [inline]
kmem_cache_free+0xdd/0x5a0 mm/slub.c:3553
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:302
Last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
__kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
insert_work+0x48/0x350 kernel/workqueue.c:1358
__queue_work+0x62f/0x1150 kernel/workqueue.c:1517
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1514 [inline]
__run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790
__run_timers kernel/time/timer.c:1768 [inline]
run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1805
__do_softirq+0x29b/0x9c2 kernel/softirq.c:571
The buggy address belongs to the object at ffff888049e79b80
which belongs to the cache net_namespace of size 6784
The buggy address is located 704 bytes inside of
6784-byte region [ffff888049e79b80, ffff888049e7b600)
The buggy address belongs to the physical page:
page:ffffea0001279e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888049e78000 pfn:0x49e78
head:ffffea0001279e00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888017648581
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001e59c08 ffff8880119cf288 ffff8881400073c0
raw: ffff888049e78000 0000000000040001 00000001ffffffff ffff888017648581
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 6827, tgid 6826 (syz-executor.4), ts 230898642309, free_ts 230892640993
prep_new_page mm/page_alloc.c:2456 [inline]
get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198
__alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
alloc_slab_page mm/slub.c:1824 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1969
new_slab mm/slub.c:2029 [inline]
___slab_alloc+0x9c4/0xe20 mm/slub.c:3031
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
slab_alloc_node mm/slub.c:3209 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3268
kmem_cache_zalloc include/linux/slab.h:723 [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:3165
__do_sys_unshare kernel/fork.c:3236 [inline]
__se_sys_unshare kernel/fork.c:3234 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3234
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1371 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421
free_unref_page_prepare mm/page_alloc.c:3343 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2548
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
slab_alloc_node mm/slub.c:3243 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3268
anon_vma_chain_alloc mm/rmap.c:140 [inline]
anon_vma_fork+0x1df/0x630 mm/rmap.c:361
dup_mmap kernel/fork.c:658 [inline]
dup_mm+0xa07/0x1390 kernel/fork.c:1524
copy_mm kernel/fork.c:1576 [inline]
copy_process+0x3bba/0x7020 kernel/fork.c:2240
kernel_clone+0xe7/0xab0 kernel/fork.c:2655
__do_sys_clone+0xba/0x100 kernel/fork.c:2789
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Memory state around the buggy address:
ffff888049e79d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888049e79d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888049e79e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888049e79e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888049e79f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: e2 03 loop 0x5
2: 00 00 add %al,(%rax)
4: 4d 85 ed test %r13,%r13
7: 74 01 je 0xa
9: fb sti
a: 4c 8d ab 80 11 00 00 lea 0x1180(%rbx),%r13
11: be 04 00 00 00 mov $0x4,%esi
16: 4c 89 ef mov %r13,%rdi
19: e8 41 d2 f8 ff callq 0xfff8d25f
1e: 4c 89 e8 mov %r13,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 42 0f b6 14 20 movzbl (%rax,%r12,1),%edx
* 2a: 4c 89 e8 mov %r13,%rax <-- trapping instruction
2d: 83 e0 07 and $0x7,%eax
30: 83 c0 03 add $0x3,%eax
33: 38 d0 cmp %dl,%al
35: 7c 08 jl 0x3f
37: 84 d2 test %dl,%dl
39: 0f 85 3c 04 00 00 jne 0x47b
3f: 8b .byte 0x8b