==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
Read of size 1 at addr ffff88805e1c8765 by task swapper/3/0
CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.0.0-rc1-syzkaller-00368-gf31c32efd57c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433
kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:637
call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1519 [inline]
__run_timers.part.0+0x674/0xa80 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+0x1d3/0x9c6 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+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:731
Code: f8 e9 8c fd ff ff 4c 89 f7 e8 61 a2 44 f8 e9 3a fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc 66 90 0f 00 2d 37 a0 64 00 fb f4 0f 1f 40 00 41 54 be 08 00 00 00 53 65 48 8b 1c 25 80 6f 02 00
RSP: 0018:ffffc9000069fe00 EFLAGS: 00000246
RAX: 00000000001691ff RBX: ffff888012536080 RCX: ffffffff897f2795
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000000000001 R09: ffff88802cb34c4b
R10: ffffed1005966989 R11: 0000000000000000 R12: ffffed10024a6c10
R13: 0000000000000003 R14: ffffffff8dddf090 R15: 0000000000000000
default_idle_call+0x80/0xc0 kernel/sched/idle.c:109
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x401/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262
secondary_startup_64_no_verify+0xce/0xdb
Allocated by task 6749:
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:437 [inline]
__kasan_slab_alloc+0x85/0xb0 mm/kasan/common.c:470
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc mm/slab.c:3294 [inline]
__kmem_cache_alloc_lru mm/slab.c:3471 [inline]
kmem_cache_alloc+0x214/0x520 mm/slab.c:3491
kmem_cache_zalloc include/linux/slab.h:723 [inline]
net_alloc net/core/net_namespace.c:404 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
copy_namespaces+0x391/0x480 kernel/nsproxy.c:178
copy_process+0x305c/0x7090 kernel/fork.c:2259
kernel_clone+0xe7/0xab0 kernel/fork.c:2673
__do_sys_clone+0xba/0x100 kernel/fork.c:2807
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+0x63/0xcd
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+0x625/0x1210 kernel/workqueue.c:1517
call_timer_fn+0x1a0/0x6b0 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+0x1d3/0x9c6 kernel/softirq.c:571
The buggy address belongs to the object at ffff88805e1c80c0
which belongs to the cache net_namespace of size 6784
The buggy address is located 1701 bytes inside of
6784-byte region [ffff88805e1c80c0, ffff88805e1c9b40)
The buggy address belongs to the physical page:
page:ffffea0001787200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805e1c80c0 pfn:0x5e1c8
head:ffffea0001787200 order:1 compound_mapcount:0 compound_pincount:0
memcg:ffff888067d36a41
flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000010200 ffffea00018a3308 ffffea00018c3288 ffff8880121e0400
raw: ffff88805e1c80c0 ffff88805e1c80c0 0000000100000000 ffff888067d36a41
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x40cc0(GFP_KERNEL|__GFP_COMP), pid 3693, tgid 3693 (syz-executor.3), ts 93136180797, free_ts 0
prep_new_page mm/page_alloc.c:2532 [inline]
get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515
__alloc_pages_node include/linux/gfp.h:243 [inline]
kmem_getpages mm/slab.c:1363 [inline]
cache_grow_begin+0x75/0x360 mm/slab.c:2569
fallback_alloc+0x1e2/0x2d0 mm/slab.c:3112
__do_cache_alloc mm/slab.c:3253 [inline]
slab_alloc mm/slab.c:3287 [inline]
__kmem_cache_alloc_lru mm/slab.c:3471 [inline]
kmem_cache_alloc+0x30d/0x520 mm/slab.c:3491
kmem_cache_zalloc include/linux/slab.h:723 [inline]
net_alloc net/core/net_namespace.c:404 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:227
ksys_unshare+0x445/0x920 kernel/fork.c:3183
__do_sys_unshare kernel/fork.c:3254 [inline]
__se_sys_unshare kernel/fork.c:3252 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3252
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+0x63/0xcd
page_owner free stack trace missing
Memory state around the buggy address:
ffff88805e1c8600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805e1c8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805e1c8700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805e1c8780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805e1c8800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: f8 clc
1: e9 8c fd ff ff jmpq 0xfffffd92
6: 4c 89 f7 mov %r14,%rdi
9: e8 61 a2 44 f8 callq 0xf844a26f
e: e9 3a fd ff ff jmpq 0xfffffd4d
13: cc int3
14: cc int3
15: cc int3
16: cc int3
17: cc int3
18: cc int3
19: cc int3
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: cc int3
1f: 66 90 xchg %ax,%ax
21: 0f 00 2d 37 a0 64 00 verw 0x64a037(%rip) # 0x64a05f
28: fb sti
29: f4 hlt
* 2a: c3 retq <-- trapping instruction
2b: 0f 1f 40 00 nopl 0x0(%rax)
2f: 41 54 push %r12
31: be 08 00 00 00 mov $0x8,%esi
36: 53 push %rbx
37: 65 48 8b 1c 25 80 6f mov %gs:0x26f80,%rbx
3e: 02 00