loop6: detected capacity change from 0 to 2048
EXT4-fs warning (device loop7): ext4_enable_quotas:7164: Failed to enable quota tracking (type=0, err=-22, ino=3). Please run e2fsck to fix.
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff8880199e0980 by task syz-executor.7/19505
CPU: 1 UID: 0 PID: 19505 Comm: syz-executor.7 Not tainted 6.16.0-rc4-next-20250701 #1 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xca/0x120
print_report+0xcb/0x670
kasan_report+0xca/0x100
kasan_check_range+0x37/0x1a0
flush_tlb_func+0x24d/0x560
__flush_smp_call_function_queue+0x20d/0x740
__sysvec_call_function_single+0x6d/0x360
sysvec_call_function_single+0xa1/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:console_flush_all+0x8c1/0xb70
Code: 01 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 6c 02 00 00 49 89 6f 58 e9 3a ff ff ff e8 c8 46 1f 00 e8 d3 70 27 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 30 00 0f 84 19 ff ff ff 4c 89 ef e8 d8 a7 5a
RSP: 0018:ffff888031f0f4a8 EFLAGS: 00000202
RAX: ffffffff85f35eb8 RBX: 0000000000000001 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81544fbd
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff85f35eb8 R14: dffffc0000000000 R15: ffffffff85f35e60
console_unlock+0xc2/0x1f0
vprintk_emit+0x437/0x680
_printk+0xbe/0xf0
__ext4_warning+0x1c6/0x1f0
ext4_enable_quotas+0x765/0xb10
ext4_fill_super+0x96e6/0xb990
get_tree_bdev_flags+0x38a/0x620
vfs_get_tree+0x93/0x340
path_mount+0x12b7/0x1fb0
__x64_sys_mount+0x27b/0x300
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f508072f04a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 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:00007f507dca2fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f508072f04a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f507dca3000
RBP: 00007f507dca3040 R08: 00007f507dca3040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f507dca3000 R15: 0000000020013e00
Allocated by task 279:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x13e/0x470
copy_process+0x6f3a/0x73e0
kernel_clone+0xea/0x820
__do_sys_clone+0xce/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 19506:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3c/0x90
__kasan_slab_free+0x3c/0x60
kmem_cache_free+0x2a5/0x460
mmput+0x305/0x390
do_exit+0x79d/0x2970
do_group_exit+0xd3/0x2a0
get_signal+0x2315/0x2340
arch_do_signal_or_restart+0x80/0x790
exit_to_user_mode_loop+0x8b/0x100
do_syscall_64+0x2f7/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff8880199e0000
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff8880199e0000, ffff8880199e0998)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x199e0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88801e9a2e01
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801e9a2e01
head: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88801e9a2e01
head: 0100000000000003 ffffea0000667801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880199e0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880199e0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880199e0980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880199e0a00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff8880199e0a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs warning (device loop6): ext4_enable_quotas:7164: Failed to enable quota tracking (type=0, err=-22, ino=3). Please run e2fsck to fix.
EXT4-fs (loop7): mount failed
EXT4-fs (loop6): mount failed
loop4: detected capacity change from 0 to 2216
loop3: detected capacity change from 0 to 2048
loop6: detected capacity change from 0 to 2048
loop2: detected capacity change from 0 to 2048
loop7: detected capacity change from 0 to 2048
loop5: detected capacity change from 0 to 2048
loop1: detected capacity change from 0 to 2048
EXT4-fs warning (device loop6): ext4_enable_quotas:7164: Failed to enable quota tracking (type=0, err=-22, ino=3). Please run e2fsck to fix.
EXT4-fs warning (device loop3): ext4_enable_quotas:7164: Failed to enable quota tracking (type=0, err=-22, ino=3). Please run e2fsck to fix.
EXT4-fs warning (device loop2): ext4_enable_quotas:7164: Failed to enable quota tracking (type=0, err=-22, ino=3). Please run e2fsck to fix.
EXT4-fs (loop6): mount failed
EXT4-fs (loop3): mount failed
EXT4-fs (loop2): mount failed
EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
EXT4-fs (loop7): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
Quota error (device loop1): find_block_dqentry: Quota for id 0 referenced but not present
Quota error (device loop1): qtree_read_dquot: Can't read quota structure for id 0
EXT4-fs error (device loop1): ext4_acquire_dquot:6931: comm syz-executor.1: Failed to acquire dquot type 1
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop7): unmounting filesystem 00000000-0000-0000-0000-000000000000.
loop3: detected capacity change from 0 to 2048
loop2: detected capacity change from 0 to 2048
EXT4-fs warning (device loop3): ext4_enable_quotas:7164: Failed to enable quota tracking (type=0, err=-22, ino=3). Please run e2fsck to fix.
EXT4-fs (loop3): mount failed
EXT4-fs warning (device loop2): ext4_enable_quotas:7164: Failed to enable quota tracking (type=0, err=-22, ino=3). Please run e2fsck to fix.
EXT4-fs (loop2): mount failed
loop5: detected capacity change from 0 to 2048
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
----------------
Code disassembly (best guess):
0: 01 4c 89 e8 add %ecx,-0x18(%rcx,%rcx,4)
4: 48 c1 e8 03 shr $0x3,%rax
8: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1)
d: 0f 85 6c 02 00 00 jne 0x27f
13: 49 89 6f 58 mov %rbp,0x58(%r15)
17: e9 3a ff ff ff jmpq 0xffffff56
1c: e8 c8 46 1f 00 callq 0x1f46e9
21: e8 d3 70 27 00 callq 0x2770f9
26: fb sti
27: 4c 89 e8 mov %r13,%rax
* 2a: 48 c1 e8 03 shr $0x3,%rax <-- trapping instruction
2e: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1)
33: 0f 84 19 ff ff ff je 0xffffff52
39: 4c 89 ef mov %r13,%rdi
3c: e8 .byte 0xe8
3d: d8 .byte 0xd8
3e: a7 cmpsl %es:(%rdi),%ds:(%rsi)
3f: 5a pop %rdx