RBP: 00007f0853e501d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd2f5844ff R14: 00007f0853e50300 R15: 0000000000022000
</TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 12548 Comm: syz-executor.6 Not tainted 6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
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 32 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:ffff88804503f9f0 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888047a665c0 RCX: ffffc900029fc000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888047a667e8 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f0853e50700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
syz-executor.0: attempt to access beyond end of device
loop0: rw=2049, sector=124, nr_sectors = 4 limit=40
CR2: 0000000000000000 CR3: 00000000446a0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Buffer I/O error on dev loop0, logical block 31, lost async page write
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<TASK>
ext4_da_write_begin+0x38d/0x830
generic_perform_write+0x25a/0x580
ext4_buffered_write_iter+0x164/0x460
ext4_file_write_iter+0x3ff/0x1950
vfs_write+0x9bb/0xdd0
ksys_write+0x12b/0x260
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f08568dab19
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:00007f0853e50188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f08569edf60 RCX: 00007f08568dab19
RDX: 00000000000292e9 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007f0853e501d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd2f5844ff R14: 00007f0853e50300 R15: 0000000000022000
</TASK>
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 32 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:ffff88804503f9f0 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888047a665c0 RCX: ffffc900029fc000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888047a667e8 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f0853e50700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000446a0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
syz-executor.0: attempt to access beyond end of device
loop0: rw=0, sector=28, nr_sectors = 100 limit=40
syz-executor.0: attempt to access beyond end of device
loop0: rw=2049, sector=124, nr_sectors = 4 limit=40
Buffer I/O error on dev loop0, logical block 31, lost async page write
loop0: detected capacity change from 0 to 40
syz-executor.0: attempt to access beyond end of device
loop0: rw=2049, sector=124, nr_sectors = 4 limit=40
Buffer I/O error on dev loop0, logical block 31, lost async page write
syz-executor.0: attempt to access beyond end of device
loop0: rw=0, sector=28, nr_sectors = 100 limit=40
syz-executor.0: attempt to access beyond end of device
loop0: rw=2049, sector=124, nr_sectors = 4 limit=40
Buffer I/O error on dev loop0, logical block 31, lost async page write
==================================================================
BUG: KASAN: slab-use-after-free in rwsem_down_write_slowpath+0x13a6/0x14a0
Read of size 4 at addr ffff888015960034 by task syz-executor.6/270
CPU: 0 PID: 270 Comm: syz-executor.6 Tainted: G D 6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
<TASK>
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: 0033:0x7f08568da457
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:00007ffd2f583648 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f08568da457
RDX: 00007ffd2f583680 RSI: 00007ffd2f583680 RDI: 00007ffd2f583710
RBP: 00007ffd2f583710 R08: 0000000000000001 R09: 00007ffd2f5834e0
R10: 0000555557168d13 R11: 0000000000000206 R12: 00007f0856934105
R13: 00007ffd2f5847d0 R14: 0000555557168c20 R15: 00007ffd2f584810
</TASK>
Allocated by task 12543:
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 12543:
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
_free_event+0xab4/0x1150
perf_event_release_kernel+0x5b8/0x7a0
perf_release+0x37/0x50
__fput+0x263/0xa40
task_work_run+0x174/0x280
exit_to_user_mode_prepare+0x17d/0x180
syscall_exit_to_user_mode+0x1d/0x50
do_syscall_64+0x4c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
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
io_schedule+0xc2/0x140
bit_wait_io+0x16/0xf0
__wait_on_bit+0x6a/0x1b0
out_of_line_wait_on_bit+0xd9/0x110
__wait_on_buffer+0x63/0x70
jbd2_journal_commit_transaction+0x3560/0x5f80
kjournald2+0x1d0/0x890
kthread+0x33f/0x440
ret_from_fork+0x2c/0x50
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 ffff888015960000
which belongs to the cache task_struct of size 6592
The buggy address is located 52 bytes inside of
freed 6592-byte region [ffff888015960000, ffff8880159619c0)
The buggy address belongs to the physical page:
page:000000000e391a98 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15960
head:000000000e391a98 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800e4ced41
flags: 0x100000000010200(slab|head|node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000010200 ffff888008797640 ffffea0000517600 dead000000000002
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88800e4ced41
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801595ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801595ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888015960000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888015960080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888015960100: 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 32 58 e7 ff callq 0xffe75847
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