==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: use-after-free in expire_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: use-after-free in __run_timers+0x759/0xb60 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881d34431c8 by task syz.4.1967/5566
CPU: 0 PID: 5566 Comm: syz.4.1967 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack+0x1e/0x20 lib/dump_stack.c:77
dump_stack+0x15b/0x1b8 lib/dump_stack.c:118
print_address_description+0x8d/0x4c0 mm/kasan/report.c:384
__kasan_report+0xef/0x120 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:653
__asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137
__hlist_del include/linux/list.h:791 [inline]
detach_timer kernel/time/timer.c:824 [inline]
expire_timers kernel/time/timer.c:1482 [inline]
__run_timers+0x759/0xb60 kernel/time/timer.c:1817
run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
__do_softirq+0x236/0x660 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x197/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:46 [inline]
RIP: 0010:__unwind_start+0x32d/0x3a0 arch/x86/kernel/unwind_frame.c:407
Code: b8 74 08 48 89 df e8 72 cb 5f 00 48 8b 45 c8 48 39 03 73 41 4c 89 f7 e8 f1 ed ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 4d d0 <0f> b6 04 01 84 c0 75 0c 41 83 3e 00 0f 85 1f ff ff ff eb 17 44 89
RSP: 0018:ffff8881e52cf7d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8881e52cf880 RCX: 1ffff1103ca59f09
RDX: ffff8881e52cf8d0 RSI: 1ffff1103ca59f0a RDI: ffff8881e52cf8a0
RBP: ffff8881e52cf838 R08: dffffc0000000000 R09: ffff8881e52cf848
R10: ffffed103ca59f15 R11: 1ffff1103ca59f09 R12: ffff8881e52cf858
R13: ffff8881e52cf850 R14: ffff8881e52cf848 R15: 1ffff1103ca59f0b
unwind_start arch/x86/include/asm/unwind.h:60 [inline]
arch_stack_walk+0xd8/0x140 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529
kasan_kmalloc+0xd/0x20 mm/kasan/common.c:543
kmem_cache_alloc_trace+0x112/0x290 mm/slub.c:2856
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:690 [inline]
selinux_sk_alloc_security+0x78/0x190 security/selinux/hooks.c:5247
security_sk_alloc+0x72/0xa0 security/security.c:2108
sk_prot_alloc+0x133/0x410 net/core/sock.c:1625
sk_alloc+0x38/0x330 net/core/sock.c:1680
unix_create1+0x90/0x5a0 net/unix/af_unix.c:789
unix_create+0x135/0x1c0 net/unix/af_unix.c:850
__sock_create+0x3a8/0x740 net/socket.c:1427
sock_create net/socket.c:1478 [inline]
__sys_socketpair+0x1a7/0x5a0 net/socket.c:1578
__do_sys_socketpair net/socket.c:1631 [inline]
__se_sys_socketpair net/socket.c:1628 [inline]
__x64_sys_socketpair+0x9b/0xb0 net/socket.c:1628
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f0fea6d8969
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0fe8d41038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f0fea8fffa0 RCX: 00007f0fea6d8969
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 00007f0fea75aab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0fea8fffa0 R15: 00007ffd4ec2bed8
The buggy address belongs to the page:
page:ffffea00074d10c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 ffffea0007205b48 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152dc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_ZERO)
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook mm/page_alloc.c:2165 [inline]
prep_new_page+0x35e/0x370 mm/page_alloc.c:2171
get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894
__alloc_pages include/linux/gfp.h:503 [inline]
__alloc_pages_node include/linux/gfp.h:516 [inline]
alloc_pages_node include/linux/gfp.h:530 [inline]
kmalloc_order mm/slab_common.c:1342 [inline]
kmalloc_order_trace+0x31/0x100 mm/slab_common.c:1358
kmalloc_large include/linux/slab.h:485 [inline]
__kmalloc+0x162/0x2f0 mm/slub.c:3902
__kmalloc_node include/linux/slab.h:422 [inline]
kmalloc_node include/linux/slab.h:599 [inline]
kvmalloc_node+0x88/0xf0 mm/util.c:596
kvmalloc include/linux/mm.h:761 [inline]
kvzalloc include/linux/mm.h:769 [inline]
bpf_check+0xfb/0x9cf0 kernel/bpf/verifier.c:9561
bpf_prog_load+0xa5f/0xe10 kernel/bpf/syscall.c:1724
__do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
__se_sys_bpf+0x435/0x570 kernel/bpf/syscall.c:2849
__x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1176 [inline]
__free_pages_ok+0x7e4/0x910 mm/page_alloc.c:1438
free_the_page mm/page_alloc.c:4956 [inline]
__free_pages+0x8c/0x110 mm/page_alloc.c:4962
kfree+0x1ca/0x260 mm/slub.c:4068
kvfree+0x4c/0x50 mm/util.c:625
bpf_check+0x8371/0x9cf0 kernel/bpf/verifier.c:9731
bpf_prog_load+0xa5f/0xe10 kernel/bpf/syscall.c:1724
__do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
__se_sys_bpf+0x435/0x570 kernel/bpf/syscall.c:2849
__x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Memory state around the buggy address:
ffff8881d3443080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881d3443100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881d3443180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8881d3443200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881d3443280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d5f16067 P4D 1d5f16067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5566 Comm: syz.4.1967 Tainted: G B 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881ec850000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d34431c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffbcd8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d34431c0
FS: 00007f0fe8d416c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001f3fe0000 CR4: 00000000003406b0
DR0: 0040000100000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1493 [inline]
__run_timers+0x81d/0xb60 kernel/time/timer.c:1817
run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
__do_softirq+0x236/0x660 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x197/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:46 [inline]
RIP: 0010:__unwind_start+0x32d/0x3a0 arch/x86/kernel/unwind_frame.c:407
Code: b8 74 08 48 89 df e8 72 cb 5f 00 48 8b 45 c8 48 39 03 73 41 4c 89 f7 e8 f1 ed ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 4d d0 <0f> b6 04 01 84 c0 75 0c 41 83 3e 00 0f 85 1f ff ff ff eb 17 44 89
RSP: 0018:ffff8881e52cf7d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8881e52cf880 RCX: 1ffff1103ca59f09
RDX: ffff8881e52cf8d0 RSI: 1ffff1103ca59f0a RDI: ffff8881e52cf8a0
RBP: ffff8881e52cf838 R08: dffffc0000000000 R09: ffff8881e52cf848
R10: ffffed103ca59f15 R11: 1ffff1103ca59f09 R12: ffff8881e52cf858
R13: ffff8881e52cf850 R14: ffff8881e52cf848 R15: 1ffff1103ca59f0b
unwind_start arch/x86/include/asm/unwind.h:60 [inline]
arch_stack_walk+0xd8/0x140 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529
kasan_kmalloc+0xd/0x20 mm/kasan/common.c:543
kmem_cache_alloc_trace+0x112/0x290 mm/slub.c:2856
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:690 [inline]
selinux_sk_alloc_security+0x78/0x190 security/selinux/hooks.c:5247
security_sk_alloc+0x72/0xa0 security/security.c:2108
sk_prot_alloc+0x133/0x410 net/core/sock.c:1625
sk_alloc+0x38/0x330 net/core/sock.c:1680
unix_create1+0x90/0x5a0 net/unix/af_unix.c:789
unix_create+0x135/0x1c0 net/unix/af_unix.c:850
__sock_create+0x3a8/0x740 net/socket.c:1427
sock_create net/socket.c:1478 [inline]
__sys_socketpair+0x1a7/0x5a0 net/socket.c:1578
__do_sys_socketpair net/socket.c:1631 [inline]
__se_sys_socketpair net/socket.c:1628 [inline]
__x64_sys_socketpair+0x9b/0xb0 net/socket.c:1628
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f0fea6d8969
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0fe8d41038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f0fea8fffa0 RCX: 00007f0fea6d8969
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 00007f0fea75aab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0fea8fffa0 R15: 00007ffd4ec2bed8
Modules linked in:
CR2: 0000000000000000
---[ end trace 2bca21a1b8de1070 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881ec850000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d34431c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffbcd8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d34431c0
FS: 00007f0fe8d416c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001f3fe0000 CR4: 00000000003406b0
DR0: 0040000100000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: b8 74 08 48 89 mov $0x89480874,%eax
5: df e8 fucomip %st(0),%st
7: 72 cb jb 0xffffffd4
9: 5f pop %rdi
a: 00 48 8b add %cl,-0x75(%rax)
d: 45 c8 48 39 03 rex.RB enter $0x3948,$0x3
12: 73 41 jae 0x55
14: 4c 89 f7 mov %r14,%rdi
17: e8 f1 ed ff ff call 0xffffee0d
1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
23: fc ff df
26: 48 8b 4d d0 mov -0x30(%rbp),%rcx
* 2a: 0f b6 04 01 movzbl (%rcx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 75 0c jne 0x3e
32: 41 83 3e 00 cmpl $0x0,(%r14)
36: 0f 85 1f ff ff ff jne 0xffffff5b
3c: eb 17 jmp 0x55
3e: 44 rex.R
3f: 89 .byte 0x89