R13: 00007fffd53e96ef R14: 00007fb0316e7300 R15: 0000000000022000
CPU: 1 PID: 6240 Comm: syz-executor.3 Not tainted 6.3.0-rc6-next-20230413 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
Call Trace:
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
dump_stack_lvl+0xc1/0xf0
CPU: 0 PID: 6239 Comm: syz-executor.0 Not tainted 6.3.0-rc6-next-20230413 #1
should_fail_ex+0x4b4/0x5b0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
should_failslab+0x9/0x20
RIP: 0010:folio_wait_stable+0x23/0xe0
__kmem_cache_alloc_node+0x5b/0x310
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 62 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff8880146d7488 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff88801ba76fa8 RCX: ffffc900007db000
__kmalloc+0x4a/0x160
RDX: 0000000000000001 RSI: ffffffff81646e3e RDI: 000000000000000c
iter_file_splice_write+0x169/0xcb0
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1213
R10: fffffbfff0ad8242 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88801ba771d0 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fb0316e7700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4e1955610 CR3: 0000000016c66000 CR4: 0000000000350ef0
Call Trace:
ext4_da_write_begin+0x38d/0x830
direct_splice_actor+0x113/0x180
splice_direct_to_actor+0x33a/0x8c0
generic_perform_write+0x25a/0x580
do_splice_direct+0x1bc/0x290
ext4_buffered_write_iter+0x164/0x460
ext4_file_write_iter+0x3ff/0x1950
do_sendfile+0xb1d/0x12b0
__x64_sys_sendfile64+0x1d5/0x210
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f34d4543b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f34d1ab9188 EFLAGS: 00000246
ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f34d4656f60 RCX: 00007f34d4543b19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007f34d1ab91d0 R08: 0000000000000000 R09: 0000000000000000
do_iter_readv_writev+0x211/0x3c0
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd091c48af R14: 00007f34d1ab9300 R15: 0000000000022000
do_iter_write+0x189/0x7e0
vfs_iter_write+0x74/0xb0
iter_file_splice_write+0x73f/0xcb0
direct_splice_actor+0x113/0x180
splice_direct_to_actor+0x33a/0x8c0
do_splice_direct+0x1bc/0x290
do_sendfile+0xb1d/0x12b0
__x64_sys_sendfile64+0x1d5/0x210
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fb034171b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb0316e7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fb034284f60 RCX: 00007fb034171b19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fb0316e71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007fffd53e96ef R14: 00007fb0316e7300 R15: 0000000000022000
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 62 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff8880146d7488 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff88801ba76fa8 RCX: ffffc900007db000
RDX: 0000000000000001 RSI: ffffffff81646e3e RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1213
R10: fffffbfff0ad8242 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88801ba771d0 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fb0316e7700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4e1955610 CR3: 0000000016c66000 CR4: 0000000000350ef0
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
loop5: detected capacity change from 0 to 184
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
==================================================================
BUG: KASAN: slab-use-after-free in rwsem_down_write_slowpath+0x13a6/0x14a0
Read of size 4 at addr ffff8880453c1af4 by task syz-executor.0/269
CPU: 0 PID: 269 Comm: syz-executor.0 Tainted: G D 6.3.0-rc6-next-20230413 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0x91/0xf0
print_report+0xcc/0x620
kasan_report+0xc0/0xf0
rwsem_down_write_slowpath+0x13a6/0x14a0
down_write+0x1c3/0x1f0
vfs_unlink+0xd9/0x930
do_unlinkat+0x3b9/0x650
__x64_sys_unlink+0xca/0x110
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fb034171457
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd53e8838 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb034171457
RDX: 00007fffd53e8870 RSI: 00007fffd53e8870 RDI: 00007fffd53e8900
RBP: 00007fffd53e8900 R08: 0000000000000001 R09: 00007fffd53e86d0
R10: 000055555576bd13 R11: 0000000000000206 R12: 00007fb0341cb105
R13: 00007fffd53e99c0 R14: 000055555576bc20 R15: 00007fffd53e9a00
Allocated by task 6234:
kasan_save_stack+0x22/0x50
kasan_set_track+0x25/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_node+0x189/0x3a0
copy_process+0x3c2/0x7330
kernel_clone+0xeb/0x7d0
__do_sys_clone+0xba/0x100
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
Freed by task 6243:
kasan_save_stack+0x22/0x50
kasan_set_track+0x25/0x30
kasan_save_free_info+0x2e/0x50
__kasan_slab_free+0x10a/0x190
kmem_cache_free+0xff/0x4a0
delayed_put_task_struct+0x1c9/0x240
rcu_core+0x8c8/0x2860
__do_softirq+0x1b7/0x7d4
Last potentially related work creation:
kasan_save_stack+0x22/0x50
__kasan_record_aux_stack+0x95/0xb0
__call_rcu_common.constprop.0+0x6a/0xb90
put_task_struct_rcu_user+0x87/0xd0
__schedule+0x995/0x2a00
schedule+0xdb/0x1a0
do_nanosleep+0x154/0x510
hrtimer_nanosleep+0x208/0x590
common_nsleep+0xaa/0xd0
__x64_sys_clock_nanosleep+0x335/0x480
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
Second to last potentially related work creation:
kasan_save_stack+0x22/0x50
__kasan_record_aux_stack+0x95/0xb0
__call_rcu_common.constprop.0+0x6a/0xb90
put_task_struct_rcu_user+0x87/0xd0
__schedule+0x995/0x2a00
schedule+0xdb/0x1a0
exit_to_user_mode_prepare+0x95/0x180
syscall_exit_to_user_mode+0x1d/0x50
do_syscall_64+0x4c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
The buggy address belongs to the object at ffff8880453c1ac0
which belongs to the cache task_struct of size 6592
The buggy address is located 52 bytes inside of
freed 6592-byte region [ffff8880453c1ac0, ffff8880453c3480)
The buggy address belongs to the physical page:
page:00000000d9e37a47 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x453c0
head:00000000d9e37a47 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800f202d81
anon flags: 0x100000000010200(slab|head|node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000010200 ffff888008792640 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88800f202d81
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880453c1980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff8880453c1a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880453c1a80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
^
ffff8880453c1b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880453c1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: f3 0f 1e fa endbr64
b: 55 push %rbp
c: 48 89 fd mov %rdi,%rbp
f: 53 push %rbx
10: e8 62 58 e7 ff callq 0xffe75877
15: 48 8d 7d 18 lea 0x18(%rbp),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 a4 00 00 00 jne 0xd8
34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
3b: fc ff df
3e: 48 rex.W
3f: 8b .byte 0x8b