==================================================================
BUG: KASAN: use-after-free in smc_fback_error_report+0x96/0xa0 net/smc/af_smc.c:670
Read of size 8 at addr ffff888048ca51a8 by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc7-syzkaller-00241-gf0e18b03fcaf #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 1b 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: ffff888012bec064 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e3408 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888012bec000 R14: ffff888012bec064 R15: ffff888146613004
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
The buggy address belongs to the page:
page:ffffea0001232940 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48ca5
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT), pid 3623, ts 800107636741, free_ts 800203959815
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+0x1aa/0x310 mm/mempolicy.c:2271
__pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
pte_alloc_one+0x16/0x230 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
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_list+0x1a9/0xfa0 mm/page_alloc.c:3441
release_pages+0x317/0x1220 mm/swap.c:980
tlb_batch_pages_flush mm/mmu_gather.c:50 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:243 [inline]
tlb_flush_mmu mm/mmu_gather.c:250 [inline]
tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:341
exit_mmap+0x21b/0x6a0 mm/mmap.c:3180
__mmput+0x122/0x4b0 kernel/fork.c:1114
mmput+0x56/0x60 kernel/fork.c:1135
exit_mm kernel/exit.c:507 [inline]
do_exit+0xa3c/0x2a30 kernel/exit.c:793
do_group_exit+0xd2/0x2f0 kernel/exit.c:935
get_signal+0x45a/0x2490 kernel/signal.c:2863
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address:
ffff888048ca5080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888048ca5100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888048ca5180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff888048ca5200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888048ca5280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
----------------
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 1b c2 00 verw 0xc21b81(%rip) # 0xc21ba4
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