==================================================================
BUG: KASAN: slab-out-of-bounds in smc_fback_error_report+0x96/0xa0 net/smc/af_smc.c:670
Read of size 8 at addr ffff888071b750a8 by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc8-syzkaller #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:670
sk_error_report+0x35/0x310 net/core/sock.c:340
tcp_write_err net/ipv4/tcp_timer.c:71 [inline]
tcp_probe_timer net/ipv4/tcp_timer.c:395 [inline]
tcp_write_timer_handler+0x437/0xbc0 net/ipv4/tcp_timer.c:626
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:116 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556
Code: 89 de e8 2d 0e 29 f8 84 db 75 ac e8 c4 0a 29 f8 e8 ff 48 2f f8 eb 0c e8 b8 0a 29 f8 0f 00 2d 81 1a c2 00 e8 ac 0a 29 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 a7 0c 29 f8 48 85 db
RSP: 0018:ffffc90000f6fd18 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888011c5a100 RSI: ffffffff894eeae4 RDI: 0000000000000000
RBP: ffff888012dbd864 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e3408 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888012dbd800 R14: ffff888012dbd864 R15: ffff888146ac2004
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:692
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 3627:
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+0x85/0xb0 mm/kasan/common.c:469
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+0x265/0x560 mm/slab.c:3499
getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
getname_flags+0x9a/0xe0 include/linux/audit.h:323
user_path_at_empty+0x2b/0x60 fs/namei.c:2850
user_path_at include/linux/namei.h:57 [inline]
ksys_umount fs/namespace.c:1809 [inline]
__do_sys_umount fs/namespace.c:1817 [inline]
__se_sys_umount fs/namespace.c:1815 [inline]
__x64_sys_umount+0xf8/0x180 fs/namespace.c:1815
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+0x44/0xae
Freed by task 3627:
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+0xff/0x140 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:236 [inline]
__cache_free mm/slab.c:3437 [inline]
kmem_cache_free.part.0+0x91/0x200 mm/slab.c:3733
putname fs/namei.c:270 [inline]
putname+0xfe/0x140 fs/namei.c:256
user_path_at_empty+0x4d/0x60 fs/namei.c:2853
user_path_at include/linux/namei.h:57 [inline]
ksys_umount fs/namespace.c:1809 [inline]
__do_sys_umount fs/namespace.c:1817 [inline]
__se_sys_umount fs/namespace.c:1815 [inline]
__x64_sys_umount+0xf8/0x180 fs/namespace.c:1815
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+0x44/0xae
The buggy address belongs to the object at ffff888071b74080
which belongs to the cache names_cache of size 4096
The buggy address is located 40 bytes to the right of
4096-byte region [ffff888071b74080, ffff888071b75080)
The buggy address belongs to the page:
page:ffffea0001c6dd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x71b74
head:ffffea0001c6dd00 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001de5308 ffffea0001061f08 ffff88801150d600
raw: 0000000000000000 ffff888071b74080 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 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 2965, ts 639948432516, free_ts 639718874554
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+0x75/0x390 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]
__do_cache_alloc mm/slab.c:3267 [inline]
slab_alloc mm/slab.c:3308 [inline]
kmem_cache_alloc+0x450/0x560 mm/slab.c:3499
getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
getname_flags+0x9a/0xe0 include/linux/audit.h:323
user_path_at_empty+0x2b/0x60 fs/namei.c:2850
user_path_at include/linux/namei.h:57 [inline]
vfs_statx+0x142/0x390 fs/stat.c:221
vfs_fstatat fs/stat.c:243 [inline]
__do_sys_newfstatat+0x96/0x120 fs/stat.c:412
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+0x44/0xae
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+0x303/0x600 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+0x265/0x560 mm/slab.c:3499
ptlock_alloc+0x1d/0x70 mm/memory.c:5467
ptlock_init include/linux/mm.h:2300 [inline]
pgtable_pte_page_ctor include/linux/mm.h:2327 [inline]
__pte_alloc_one include/asm-generic/pgalloc.h:66 [inline]
pte_alloc_one+0x68/0x230 arch/x86/mm/pgtable.c:33
__pte_alloc+0x69/0x250 mm/memory.c:465
copy_pte_range mm/memory.c:1025 [inline]
copy_pmd_range mm/memory.c:1160 [inline]
copy_pud_range mm/memory.c:1197 [inline]
copy_p4d_range mm/memory.c:1221 [inline]
copy_page_range+0x186e/0x42b0 mm/memory.c:1294
dup_mmap kernel/fork.c:612 [inline]
dup_mm+0xa4e/0x13d0 kernel/fork.c:1451
copy_mm kernel/fork.c:1503 [inline]
copy_process+0x3cf7/0x7250 kernel/fork.c:2164
kernel_clone+0xe7/0xab0 kernel/fork.c:2565
__do_sys_clone+0xc8/0x110 kernel/fork.c:2682
Memory state around the buggy address:
ffff888071b74f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888071b75000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888071b75080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888071b75100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888071b75180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 2d 0e 29 f8 callq 0xf8290e34
7: 84 db test %bl,%bl
9: 75 ac jne 0xffffffb7
b: e8 c4 0a 29 f8 callq 0xf8290ad4
10: e8 ff 48 2f f8 callq 0xf82f4914
15: eb 0c jmp 0x23
17: e8 b8 0a 29 f8 callq 0xf8290ad4
1c: 0f 00 2d 81 1a c2 00 verw 0xc21a81(%rip) # 0xc21aa4
23: e8 ac 0a 29 f8 callq 0xf8290ad4
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 a7 0c 29 f8 callq 0xf8290ce4
3d: 48 85 db test %rbx,%rbx