==================================================================
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 ffff88804307e765 by task kworker/u16:0/8478
CPU: 0 PID: 8478 Comm: kworker/u16:0 Not tainted 6.0.0-rc7-syzkaller-00162-g5a77386984b5 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
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 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:kernfs_root fs/kernfs/kernfs-internal.h:66 [inline]
RIP: 0010:kernfs_remove_by_name_ns+0x43/0x110 fs/kernfs/dir.c:1584
Code: 0f 84 ba 00 00 00 e8 ec fc 7e ff 48 8d 7d 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 be 00 00 00 <48> 8b 5d 30 48 85 db 48 0f 44 dd e8 bd fc 7e ff 48 b8 00 00 00 00
RSP: 0018:ffffc9000497fa80 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88801c229000 RCX: 0000000000000000
RDX: 1ffff1100c5f119c RSI: ffffffff81fc3a34 RDI: ffff888062f88ce0
RBP: ffff888062f88cb0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801c229008
R13: ffff8880691a8000 R14: 0000000000000000 R15: ffff888069d44c80
del_nbp+0x88/0xd20 net/bridge/br_if.c:328
br_dev_delete+0x95/0x190 net/bridge/br_if.c:376
default_device_exit_batch+0x377/0x590 net/core/dev.c:11351
ops_exit_list+0x125/0x170 net/core/net_namespace.c:167
cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Allocated by task 3694:
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: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:3181
__do_sys_unshare kernel/fork.c:3252 [inline]
__se_sys_unshare kernel/fork.c:3250 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3250
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
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+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 ffff88804307e0c0
which belongs to the cache net_namespace of size 6784
The buggy address is located 1701 bytes inside of
6784-byte region [ffff88804307e0c0, ffff88804307fb40)
The buggy address belongs to the physical page:
page:ffffea00010c1f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4307e
head:ffffea00010c1f80 order:1 compound_mapcount:0 compound_pincount:0
flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000010200 ffffea00010b1188 ffffea000191dd88 ffff8880121e1400
raw: 0000000000000000 ffff88804307e0c0 0000000100000001 0000000000000000
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 3694, tgid 3694 (syz-executor.2), ts 80430120807, free_ts 33556135573
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:5549
__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: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:3181
__do_sys_unshare kernel/fork.c:3252 [inline]
__se_sys_unshare kernel/fork.c:3250 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3250
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 last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1449 [inline]
free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
free_unref_page_prepare mm/page_alloc.c:3380 [inline]
free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
slab_destroy mm/slab.c:1615 [inline]
slabs_destroy+0x89/0xc0 mm/slab.c:1635
__cache_free_alien mm/slab.c:774 [inline]
cache_free_alien mm/slab.c:790 [inline]
___cache_free+0x200/0x3d0 mm/slab.c:3445
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:447
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]
locks_alloc_lock fs/locks.c:270 [inline]
fcntl_setlk+0x86/0xcf0 fs/locks.c:2350
do_fcntl+0x231/0x1100 fs/fcntl.c:363
__do_sys_fcntl fs/fcntl.c:454 [inline]
__se_sys_fcntl fs/fcntl.c:439 [inline]
__x64_sys_fcntl+0x15f/0x1d0 fs/fcntl.c:439
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
Memory state around the buggy address:
ffff88804307e600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804307e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804307e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804307e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804307e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 0f 84 ba 00 00 00 je 0xc0
6: e8 ec fc 7e ff callq 0xff7efcf7
b: 48 8d 7d 30 lea 0x30(%rbp),%rdi
f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
16: fc ff df
19: 48 89 fa mov %rdi,%rdx
1c: 48 c1 ea 03 shr $0x3,%rdx
20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
24: 0f 85 be 00 00 00 jne 0xe8
* 2a: 48 8b 5d 30 mov 0x30(%rbp),%rbx <-- trapping instruction
2e: 48 85 db test %rbx,%rbx
31: 48 0f 44 dd cmove %rbp,%rbx
35: e8 bd fc 7e ff callq 0xff7efcf7
3a: 48 rex.W
3b: b8 00 00 00 00 mov $0x0,%eax