==================================================================
BUG: KASAN: use-after-free in smc_fback_error_report+0x96/0xa0 net/smc/af_smc.c:664
Read of size 8 at addr ffff88807ad807a8 by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc3-syzkaller-00048-ge3c85076d7a6 #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+0x8d/0x303 mm/kasan/report.c:255
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
smc_fback_error_report+0x96/0xa0 net/smc/af_smc.c:664
sk_error_report+0x35/0x310 net/core/sock.c:340
tcp_write_err net/ipv4/tcp_timer.c:71 [inline]
tcp_write_timeout net/ipv4/tcp_timer.c:276 [inline]
tcp_retransmit_timer+0x20c2/0x3320 net/ipv4/tcp_timer.c:512
tcp_write_timer_handler+0x5e6/0xbc0 net/ipv4/tcp_timer.c:622
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:551
Code: 89 de e8 6d 1c 2a f8 84 db 75 ac e8 84 18 2a f8 e8 1f 5e 30 f8 eb 0c e8 78 18 2a f8 0f 00 2d 61 68 c3 00 e8 6c 18 2a f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 e7 1a 2a f8 48 85 db
RSP: 0018:ffffc90000f6fd18 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888011c5a100 RSI: ffffffff894d95c4 RDI: 0000000000000000
RBP: ffff888012db1864 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817df408 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888012db1800 R14: ffff888012db1864 R15: ffff888018d94004
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:687
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:158 [inline]
cpuidle_idle_call kernel/sched/idle.c:239 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:306
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
start_secondary+0x265/0x340 arch/x86/kernel/smpboot.c:272
secondary_startup_64_no_verify+0xc3/0xcb
Allocated by task 11681:
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_kmalloc mm/kasan/common.c:515 [inline]
____kasan_kmalloc mm/kasan/common.c:474 [inline]
__kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:524
kmalloc_reserve net/core/skbuff.c:354 [inline]
__alloc_skb+0xde/0x340 net/core/skbuff.c:426
alloc_skb include/linux/skbuff.h:1158 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:745 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:802 [inline]
nsim_dev_trap_report_work+0x29a/0xbc0 drivers/net/netdevsim/dev.c:843
process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
worker_thread+0x657/0x1110 kernel/workqueue.c:2454
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Freed by task 11681:
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 mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xee/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:236 [inline]
__cache_free mm/slab.c:3437 [inline]
kfree+0xf6/0x290 mm/slab.c:3794
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x65d/0x790 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb net/core/skbuff.c:914 [inline]
consume_skb+0xc2/0x160 net/core/skbuff.c:908
nsim_dev_trap_report drivers/net/netdevsim/dev.c:818 [inline]
nsim_dev_trap_report_work+0x85d/0xbc0 drivers/net/netdevsim/dev.c:843
process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
worker_thread+0x657/0x1110 kernel/workqueue.c:2454
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff88807ad80000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 1960 bytes inside of
4096-byte region [ffff88807ad80000, ffff88807ad81000)
The buggy address belongs to the page:
page:ffffea0001eb6000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ad80
head:ffffea0001eb6000 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000687008 ffffea0001d42b88 ffff888010c40900
raw: 0000000000000000 ffff88807ad80000 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 0x3c2220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE), pid 11681, ts 1617807257120, free_ts 1609076756265
prep_new_page mm/page_alloc.c:2434 [inline]
get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389
__alloc_pages_node include/linux/gfp.h:572 [inline]
kmem_getpages mm/slab.c:1378 [inline]
cache_grow_begin+0x75/0x350 mm/slab.c:2584
cache_alloc_refill+0x27f/0x380 mm/slab.c:2957
____cache_alloc mm/slab.c:3040 [inline]
____cache_alloc mm/slab.c:3023 [inline]
slab_alloc_node mm/slab.c:3241 [inline]
kmem_cache_alloc_node_trace+0x49c/0x5b0 mm/slab.c:3609
__do_kmalloc_node mm/slab.c:3631 [inline]
__kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3646
kmalloc_reserve net/core/skbuff.c:354 [inline]
__alloc_skb+0xde/0x340 net/core/skbuff.c:426
alloc_skb include/linux/skbuff.h:1158 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:745 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:802 [inline]
nsim_dev_trap_report_work+0x29a/0xbc0 drivers/net/netdevsim/dev.c:843
process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
worker_thread+0x657/0x1110 kernel/workqueue.c:2454
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1352 [inline]
free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404
free_unref_page_prepare mm/page_alloc.c:3325 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3404
slab_destroy mm/slab.c:1630 [inline]
slabs_destroy+0x89/0xc0 mm/slab.c:1650
cache_flusharray mm/slab.c:3410 [inline]
___cache_free+0x312/0x5c0 mm/slab.c:3472
qlink_free mm/kasan/quarantine.c:157 [inline]
qlist_free_all+0x50/0x1a0 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:260 [inline]
slab_post_alloc_hook mm/slab.h:732 [inline]
slab_alloc mm/slab.c:3315 [inline]
kmem_cache_alloc+0x1bc/0x560 mm/slab.c:3499
sock_alloc_inode+0x18/0x1c0 net/socket.c:304
alloc_inode+0x61/0x230 fs/inode.c:260
new_inode_pseudo+0x14/0xe0 fs/inode.c:1018
sock_alloc+0x3c/0x260 net/socket.c:627
__sock_create+0xb9/0x790 net/socket.c:1432
rds_tcp_conn_path_connect+0x465/0x880 net/rds/tcp_connect.c:115
rds_connect_worker+0x1a5/0x2c0 net/rds/threads.c:176
process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
Memory state around the buggy address:
ffff88807ad80680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807ad80700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807ad80780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807ad80800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807ad80880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 6d 1c 2a f8 callq 0xf82a1c74
7: 84 db test %bl,%bl
9: 75 ac jne 0xffffffb7
b: e8 84 18 2a f8 callq 0xf82a1894
10: e8 1f 5e 30 f8 callq 0xf8305e34
15: eb 0c jmp 0x23
17: e8 78 18 2a f8 callq 0xf82a1894
1c: 0f 00 2d 61 68 c3 00 verw 0xc36861(%rip) # 0xc36884
23: e8 6c 18 2a f8 callq 0xf82a1894
28: fb sti
29: f4 hlt
* 2a: 9c pushfq <-- trapping instruction
2b: 5b pop %rbx
2c: 81 e3 00 02 00 00 and $0x200,%ebx
32: fa cli
33: 31 ff xor %edi,%edi
35: 48 89 de mov %rbx,%rsi
38: e8 e7 1a 2a f8 callq 0xf82a1b24
3d: 48 85 db test %rbx,%rbx