R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc6f153daf R14: 00007f0bb0996300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88803cf2b280 by task systemd-journal/98
CPU: 0 UID: 0 PID: 98 Comm: systemd-journal Not tainted 6.16.0-rc4-next-20250702 #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+0x39/0x1b0
flush_tlb_func+0x24d/0x560
__flush_smp_call_function_queue+0x20d/0x740
__sysvec_call_function_single+0x6d/0x360
sysvec_call_function_single+0x5f/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:handle_softirqs+0x174/0x770
Code: c8 83 83 3c 0a 00 00 01 c7 44 24 20 0a 00 00 00 48 89 44 24 18 65 66 c7 05 cf b4 47 06 00 00 e8 42 6b 40 00 fb bb ff ff ff ff <48> c7 c5 c0 c0 a0 85 41 0f bc de 83 c3 01 0f 85 9b 00 00 00 e9 8d
RSP: 0018:ffff88806ce08f78 EFLAGS: 00000206
RAX: 000000000007563c RBX: 00000000ffffffff RCX: ffffffff817bc5c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880153a7cc8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000000002c0 R15: 0000000000000000
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x70/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch.isra.0+0x20f/0x840
Code: 4c 89 ff 48 c7 03 00 00 00 00 e8 3c bb 73 03 4d 85 e4 75 ba 4c 89 ff e8 9f a1 73 03 e8 1a d4 34 00 fb 65 48 8b 1d 79 1d 3c 06 <48> 8d bb f0 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffff8880153a7d70 EFLAGS: 00000206
RAX: 0000000000075639 RBX: ffff8880152e1b80 RCX: ffffffff817bc5c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8146f296
RBP: ffff8880153a7db0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: ffff88806ce36f18
R13: ffff888015dfb700 R14: ffff88806ce36f00 R15: ffff88806ce36f00
__schedule+0xe4e/0x3520
schedule+0xdb/0x390
irqentry_exit_to_user_mode+0xb0/0x1b0
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7fcdf23f1ad5
Code: 00 00 0f 1f 00 31 c0 c5 f8 77 c3 66 2e 0f 1f 84 00 00 00 00 00 89 f9 48 89 fa c5 f9 ef c0 83 e1 3f 83 f9 20 77 1f c5 fd 74 0f fd d7 c1 85 c0 0f 85 df 00 00 00 48 83 c7 20 83 e1 1f 48 83 e7
RSP: 002b:00007ffe9605fa08 EFLAGS: 00000246
RAX: 0000000000000011 RBX: 0000000000000030 RCX: 0000000000000020
RDX: 00005579a30fa3a0 RSI: 0000000000000002 RDI: 00005579a30fa3a0
RBP: 00007ffe960623c0 R08: 00005579a3126fb0 R09: 0000000000000011
R10: 00007ffe9605f7a7 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000004 R14: 00005579a30fa3a0 R15: 0000000000000000
Allocated by task 283:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x13c/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 4991:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x38/0x50
kmem_cache_free+0x2a1/0x460
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 ffff88803cf2a900
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88803cf2a900, ffff88803cf2b298)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3cf28
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800e2cff81
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea000057fc00 dead000000000004
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800e2cff81
head: 0100000000000040 ffff888008c4bc80 ffffea000057fc00 dead000000000004
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800e2cff81
head: 0100000000000003 ffffea0000f3ca01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88803cf2b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803cf2b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803cf2b280: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88803cf2b300: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff88803cf2b380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 5010 Comm: syz-executor.0 Tainted: G B 6.16.0-rc4-next-20250702 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
__kmalloc_noprof+0xb4/0x4b0
ext4_find_extent+0x7f5/0xa00
ext4_ext_map_blocks+0x1cc/0x5f30
ext4_map_query_blocks+0x117/0x890
ext4_map_blocks+0x4c3/0x15a0
ext4_alloc_file_blocks.isra.0+0x2c8/0xb60
ext4_fallocate+0x4f2/0x31d0
vfs_fallocate+0x3ef/0xd40
__x64_sys_fallocate+0xd6/0x150
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f30d91b5b19
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:00007f30d672b188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f30d92c8f60 RCX: 00007f30d91b5b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f30d672b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdbd282a1f R14: 00007f30d672b300 R15: 0000000000022000
No source specified
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 1
CPU: 1 UID: 0 PID: 5034 Comm: syz-executor.5 Tainted: G B 6.16.0-rc4-next-20250702 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
strncpy_from_user+0x3b/0x2f0
getname_flags.part.0+0x8d/0x540
getname_flags+0x95/0xe0
user_path_at+0x27/0x90
do_faccessat+0x122/0xbb0
__x64_sys_faccessat2+0x97/0x100
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6e3371b19
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:00007fb6e08e7188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b7
RAX: ffffffffffffffda RBX: 00007fb6e3484f60 RCX: 00007fb6e3371b19
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 00007fb6e08e71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001100 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe19a221df R14: 00007fb6e08e7300 R15: 0000000000022000
audit: type=1326 audit(1751498866.100:13): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5025 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f1d1ea42b19 code=0x0
audit: type=1326 audit(1751498866.150:14): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=5038 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f30dc58eb19 code=0x0
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 5041 Comm: syz-executor.5 Tainted: G B 6.16.0-rc4-next-20250702 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
_copy_to_user+0x32/0xd0
simple_read_from_buffer+0xe0/0x180
proc_fail_nth_read+0x189/0x270
vfs_read+0x1eb/0xbe0
ksys_read+0x121/0x240
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6e332469c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48
RSP: 002b:00007fb6e08e7170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb6e332469c
RDX: 000000000000000f RSI: 00007fb6e08e71e0 RDI: 0000000000000004
RBP: 00007fb6e08e71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001100 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe19a221df R14: 00007fb6e08e7300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 5049 Comm: syz-executor.0 Tainted: G B 6.16.0-rc4-next-20250702 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x5f/0x470
__es_insert_extent+0xed2/0x1370
ext4_es_insert_extent+0x4d0/0x1100
ext4_ext_map_blocks+0x1797/0x5f30
ext4_map_query_blocks+0x117/0x890
ext4_map_blocks+0x4c3/0x15a0
ext4_alloc_file_blocks.isra.0+0x2c8/0xb60
ext4_fallocate+0x4f2/0x31d0
vfs_fallocate+0x3ef/0xd40
__x64_sys_fallocate+0xd6/0x150
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f30d91b5b19
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:00007f30d672b188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f30d92c8f60 RCX: 00007f30d91b5b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f30d672b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdbd282a1f R14: 00007f30d672b300 R15: 0000000000022000
No source specified
No source specified
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 5056 Comm: syz-executor.1 Tainted: G B 6.16.0-rc4-next-20250702 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x5f/0x470
jbd2__journal_start+0x193/0x6b0
__ext4_journal_start_sb+0x325/0x5d0
ext4_alloc_file_blocks.isra.0+0x28c/0xb60
ext4_fallocate+0x4f2/0x31d0
vfs_fallocate+0x3ef/0xd40
__x64_sys_fallocate+0xd6/0x150
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0bb3420b19
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:00007f0bb0996188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f0bb3533f60 RCX: 00007f0bb3420b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f0bb09961d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc6f153daf R14: 00007f0bb0996300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: c8 83 83 3c enterq $0x8383,$0x3c
4: 0a 00 or (%rax),%al
6: 00 01 add %al,(%rcx)
8: c7 44 24 20 0a 00 00 movl $0xa,0x20(%rsp)
f: 00
10: 48 89 44 24 18 mov %rax,0x18(%rsp)
15: 65 66 c7 05 cf b4 47 movw $0x0,%gs:0x647b4cf(%rip) # 0x647b4ee
1c: 06 00 00
1f: e8 42 6b 40 00 callq 0x406b66
24: fb sti
25: bb ff ff ff ff mov $0xffffffff,%ebx
* 2a: 48 c7 c5 c0 c0 a0 85 mov $0xffffffff85a0c0c0,%rbp <-- trapping instruction
31: 41 0f bc de bsf %r14d,%ebx
35: 83 c3 01 add $0x1,%ebx
38: 0f 85 9b 00 00 00 jne 0xd9
3e: e9 .byte 0xe9
3f: 8d .byte 0x8d