==================================================================
BUG: KASAN: stack-out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:136 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x17fc/0x1ef0 arch/x86/kernel/unwind_orc.c:455
Read of size 8 at addr ffffc90004a47740 by task syz-executor.1/11776
CPU: 0 PID: 11776 Comm: syz-executor.1 Not tainted 6.2.0-next-20230221-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319
print_report mm/kasan/report.c:430 [inline]
kasan_report+0x11c/0x130 mm/kasan/report.c:536
user_mode arch/x86/include/asm/ptrace.h:136 [inline]
unwind_next_frame+0x17fc/0x1ef0 arch/x86/kernel/unwind_orc.c:455
arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x90/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491
irq_work_queue_on+0xd6/0x1a0 kernel/irq_work.c:140
irq_work_single+0x1e4/0x260 kernel/irq_work.c:211
__flush_smp_call_function_queue+0x4a3/0xad0 kernel/smp.c:668
__sysvec_call_function_single+0xce/0x4f0 arch/x86/kernel/smp.c:248
sysvec_call_function_single+0x92/0xc0 arch/x86/kernel/smp.c:243
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:finish_task_switch.isra.0+0x2bf/0xc80 kernel/sched/core.c:5183
Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 10 f8 ff ff e8 eb 8f 32 00 fb 65 48 8b 1c 25 80 b8 03 00 <48> 8d bb 50 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90004a473c0 EFLAGS: 00000202
RAX: 000000000004ddad RBX: ffff888034add7c0 RCX: 1ffffffff22a497e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004a47408 R08: 0000000000000001 R09: ffffffff914eac1f
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b983c280
R13: ffff88803c08ba80 R14: 0000000000000000 R15: ffff8880b983ccb8
context_switch kernel/sched/core.c:5307 [inline]
__schedule+0x24bc/0x5ac0 kernel/sched/core.c:6622
preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:6934
irqentry_exit+0x35/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:650
RIP: 0010:__might_resched+0xd1/0x580 kernel/sched/core.c:10060
Code: 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 1b 04 00 00 8b 05 b0 4b 20 0d 83 e8 01 83 f8 02 76 0d 48 83 c4 10 5b <5d> 41 5c 41 5d 41 5e c3 48 c7 c0 40 92 db 91 48 ba 00 00 00 00 00
RSP: 0018:ffffc90004a47670 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000cc0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888034ade188
RBP: ffffffff8a56a9c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000400 R11: 0000000000000000 R12: 0000000000000112
R13: ffff888034add7c0 R14: ffff888034add7c0 R15: 0000000000000400
lockdep_hardirqs_on+0x7d/0x100 kernel/locking/lockdep.c:4384
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:650
RIP: 4a47ab0:ext4_set_iomap+0x994/0xbc0
Code: 00 00 00 00 00 fc ff df 48 8d bd c8 0b 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 84 07 fd ff ff e8 71 49 ab ff e9 fd fc ff ff b7 b7 59 ff 48 8b 74 24 18 48 b8 00 00 00 00 00 fc ff df 48 89
RSP: 822aebc0:ffffc90004a47858 EFLAGS: ffff88803be7a0c8
RAX: 0000000000000002 RBX: ffffffff81b13820 RCX: ffffffff822ae4b2
RDX: ffff888034add7c0 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffffff8c020aaf R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000094001 R12: 0000000041b58ab3
R13: 000000000000000c R14: 0000000000000000 R15: 0000000000000200
The buggy address belongs to stack of task syz-executor.1/11776
and is located at offset 112 in frame:
mempool_alloc+0x0/0x360 mm/mempool.c:342
This frame has 1 object:
[48, 88) 'wait'
The buggy address belongs to the virtual mapping at
[ffffc90004a40000, ffffc90004a49000) created by:
kernel_clone+0xeb/0xa10 kernel/fork.c:2684
The buggy address belongs to the physical page:
page:ffffea0001f87080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e1c2
memcg:ffff888078176102
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888078176102
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 11770, tgid 11770 (syz-executor.1), ts 954407917160, free_ts 954375152752
prep_new_page mm/page_alloc.c:2552 [inline]
get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4339
__alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5605
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283
vm_area_alloc_pages mm/vmalloc.c:2942 [inline]
__vmalloc_area_node mm/vmalloc.c:3010 [inline]
__vmalloc_node_range+0xb8a/0x1300 mm/vmalloc.c:3180
alloc_thread_stack_node kernel/fork.c:311 [inline]
dup_task_struct kernel/fork.c:984 [inline]
copy_process+0x1320/0x76c0 kernel/fork.c:2100
kernel_clone+0xeb/0xa10 kernel/fork.c:2684
__do_sys_clone+0xba/0x100 kernel/fork.c:2825
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 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:1453 [inline]
free_pcp_prepare+0x4de/0x930 mm/page_alloc.c:1503
free_unref_page_prepare mm/page_alloc.c:3401 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3496
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
__kmem_cache_alloc_node+0x17c/0x330 mm/slub.c:3491
kmalloc_trace+0x26/0x60 mm/slab_common.c:1061
kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]
kernfs_iop_get_link fs/kernfs/symlink.c:135 [inline]
kernfs_iop_get_link+0x6e/0x760 fs/kernfs/symlink.c:126
vfs_readlink+0x1db/0x390 fs/namei.c:5019
do_readlinkat+0x27e/0x2f0 fs/stat.c:489
__do_sys_readlink fs/stat.c:510 [inline]
__se_sys_readlink fs/stat.c:507 [inline]
__x64_sys_readlink+0x78/0xb0 fs/stat.c:507
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Memory state around the buggy address:
ffffc90004a47600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc90004a47680: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1
>ffffc90004a47700: 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00
^
ffffc90004a47780: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 02 f3
ffffc90004a47800: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 8b 3a mov (%rdx),%edi
2: 4c 89 e7 mov %r12,%rdi
5: 48 c7 02 00 00 00 00 movq $0x0,(%rdx)
c: ff d1 callq *%rcx
e: 4d 85 ff test %r15,%r15
11: 75 bf jne 0xffffffd2
13: 4c 89 e7 mov %r12,%rdi
16: e8 10 f8 ff ff callq 0xfffff82b
1b: e8 eb 8f 32 00 callq 0x32900b
20: fb sti
21: 65 48 8b 1c 25 80 b8 mov %gs:0x3b880,%rbx
28: 03 00
* 2a: 48 8d bb 50 15 00 00 lea 0x1550(%rbx),%rdi <-- trapping instruction
31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
38: fc ff df
3b: 48 89 fa mov %rdi,%rdx
3e: 48 rex.W
3f: c1 .byte 0xc1