==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
Read of size 8 at addr ffff888073f4d118 by task syz-executor.2/11917
CPU: 0 PID: 11917 Comm: syz-executor.2 Not tainted 5.15.114-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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:1096
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_schedule_irq+0xf2/0x1c0 kernel/sched/core.c:6776
Code: 89 f5 49 c1 ed 03 eb 0d 48 f7 03 08 00 00 00 0f 84 97 00 00 00 bf 01 00 00 00 e8 59 23 34 f7 e8 44 6b 63 f7 fb bf 01 00 00 00 c9 b3 ff ff 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 79 55 a6 f7 48
RSP: 0018:ffffc9000346f2c0 EFLAGS: 00000282
RAX: 06d8649c71245700 RBX: 1ffff9200068de60 RCX: ffffffff8162db08
RDX: dffffc0000000000 RSI: ffffffff8a8afc60 RDI: 0000000000000001
RBP: ffffc9000346f380 R08: dffffc0000000000 R09: fffffbfff1f79247
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200068de58
R13: 1ffff9200068de5c R14: ffffc9000346f2e0 R15: dffffc0000000000
irqentry_exit+0x53/0x80 kernel/entry/common.c:426
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643
RIP: 0010:dump_stack_lvl+0x274/0x2cb lib/dump_stack.c:108
Code: e8 72 c3 65 f7 4c 21 e3 75 66 e8 88 bf 65 f7 4d 85 ff 75 07 e8 7e bf 65 f7 eb 06 e8 77 bf 65 f7 fb 48 c7 44 24 20 0e 36 e0 45 <48> 8b 44 24 18 49 c7 04 06 00 00 00 00 41 c7 44 06 09 00 00 00 00
RSP: 0018:ffffc9000346f440 EFLAGS: 00000293
RAX: ffffffff8a1a39d9 RBX: 0000000000000000 RCX: ffff888012bf5940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000346f530 R08: ffffffff8a1a39be R09: fffffbfff1f79247
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000046
R13: 1ffff9200068de98 R14: dffffc0000000000 R15: 0000000000000200
dump_header+0xd4/0x940 mm/oom_kill.c:463
oom_kill_process+0xef/0x3d0 mm/oom_kill.c:1006
out_of_memory+0xe97/0x1280 mm/oom_kill.c:1143
mem_cgroup_out_of_memory+0x25f/0x3c0 mm/memcontrol.c:1643
mem_cgroup_oom mm/memcontrol.c:1878 [inline]
try_charge_memcg+0x101e/0x1530 mm/memcontrol.c:2699
obj_cgroup_charge_pages+0xab/0x1d0 mm/memcontrol.c:3014
obj_cgroup_charge+0x19e/0x390 mm/memcontrol.c:3295
memcg_slab_pre_alloc_hook mm/slab.h:287 [inline]
slab_pre_alloc_hook+0xa6/0xc0 mm/slab.h:497
slab_alloc_node mm/slub.c:3134 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x3f/0x280 mm/slub.c:3233
__d_alloc+0x2a/0x700 fs/dcache.c:1744
d_alloc+0x48/0x1d0 fs/dcache.c:1823
__lookup_hash+0xca/0x240 fs/namei.c:1556
filename_create+0x28d/0x530 fs/namei.c:3766
do_mkdirat+0xb3/0x520 fs/namei.c:4009
__do_sys_mkdirat fs/namei.c:4034 [inline]
__se_sys_mkdirat fs/namei.c:4032 [inline]
__x64_sys_mkdirat+0x85/0x90 fs/namei.c:4032
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: 0033:0x7f53aac09187
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdde032518 EFLAGS: 00000206 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ffdde0325a0 RCX: 00007f53aac09187
RDX: 00000000000001ff RSI: 00007ffdde0325a0 RDI: 00000000ffffff9c
RBP: 00007ffdde03257c R08: 0000000000000000 R09: 0000000000000004
R10: 00007ffdde0322b6 R11: 0000000000000206 R12: 0000000000000032
R13: 000000000009e882 R14: 000000000000001e R15: 00007ffdde0325e0
Allocated by task 13288:
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
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
Freed by task 3629:
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:2307
worker_thread+0xaca/0x1280 kernel/workqueue.c:2454
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 ffff888073f4cec0
which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
6464-byte region [ffff888073f4cec0, ffff888073f4e800)
The buggy address belongs to the page:
page:ffffea0001cfd200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x73f48
head:ffffea0001cfd200 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801bcae7c1
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001489a00 0000000200000002 ffff888011dc63c0
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88801bcae7c1
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 3691, ts 99103823412, free_ts 99034232758
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
ptlock_alloc+0x1c/0x60 mm/memory.c:5510
ptlock_init include/linux/mm.h:2230 [inline]
pgtable_pte_page_ctor include/linux/mm.h:2257 [inline]
__pte_alloc_one include/asm-generic/pgalloc.h:66 [inline]
pte_alloc_one+0xd1/0x360 arch/x86/mm/pgtable.c:33
__pte_alloc+0x75/0x210 mm/memory.c:439
copy_pte_range mm/memory.c:1021 [inline]
copy_pmd_range mm/memory.c:1156 [inline]
copy_pud_range mm/memory.c:1193 [inline]
copy_p4d_range mm/memory.c:1217 [inline]
copy_page_range+0x37cc/0x43b0 mm/memory.c:1290
dup_mmap kernel/fork.c:613 [inline]
dup_mm+0xad6/0x1230 kernel/fork.c:1457
copy_mm+0x101/0x190 kernel/fork.c:1509
Memory state around the buggy address:
ffff888073f4d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888073f4d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888073f4d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888073f4d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888073f4d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 f5 mov %esi,%ebp
2: 49 c1 ed 03 shr $0x3,%r13
6: eb 0d jmp 0x15
8: 48 f7 03 08 00 00 00 testq $0x8,(%rbx)
f: 0f 84 97 00 00 00 je 0xac
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 59 23 34 f7 callq 0xf7342378
1f: e8 44 6b 63 f7 callq 0xf7636b68
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 c9 b3 ff ff callq 0xffffb3f8 <-- trapping instruction
2f: 43 80 7c 3d 00 00 cmpb $0x0,0x0(%r13,%r15,1)
35: 74 08 je 0x3f
37: 4c 89 f7 mov %r14,%rdi
3a: e8 79 55 a6 f7 callq 0xf7a655b8
3f: 48 rex.W