==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0x9e/0x2c0 kernel/time/timer.c:541
Write of size 8 at addr ffff8881e1f6f1c8 by task syz.7.1442/4624
CPU: 1 PID: 4624 Comm: syz.7.1442 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_add_head include/linux/list.h:814 [inline]
enqueue_timer+0x9e/0x2c0 kernel/time/timer.c:541
__internal_add_timer kernel/time/timer.c:554 [inline]
internal_add_timer+0x208/0x3e0 kernel/time/timer.c:604
__mod_timer+0x5ab/0x1150 kernel/time/timer.c:1065
mod_timer+0x1f/0x30 kernel/time/timer.c:1117
can_stat_update+0xbab/0xc40 net/can/proc.c:186
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:preempt_schedule_irq+0x96/0x110 kernel/sched/core.c:4560
Code: 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 4d bf 01 00 00 00 e8 90 21 17 fd fb bf 01 00 00 00 b5 e7 ff ff fa bf 01 00 00 00 e8 2a 23 17 fd 65 48 8b 1d 32 3c
RSP: 0018:ffff8881e8f57700 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1103e61eb07 RBX: 0000000000000000 RCX: ffffffff86542900
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffff8881e8f57788 R08: dffffc0000000000 R09: ffffed103edeaf6d
R10: ffffed103edeaf6d R11: 1ffff1103edeaf6c R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff1103d1eaee0
retint_kernel+0x1b/0x1b
RIP: 0010:dump_stack+0x180/0x1b8 lib/dump_stack.c:124
Code: e8 5d 00 00 00 48 c7 c7 e0 65 28 86 be 04 00 00 00 e8 8c 72 63 fd c7 05 32 85 fe 01 ff ff ff ff 4c 89 6c 24 10 ff 74 24 10 9d <48> c7 44 24 20 0e 36 e0 45 4b c7 04 27 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffff8881e8f57840 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff02
RAX: 4b623c2cd7347e01 RBX: 0000000000000001 RCX: ffffffff8429e0a4
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff862865e0
RBP: ffff8881e8f578f0 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0c50cbc R11: 1ffffffff0c50cbc R12: dffffc0000000000
R13: 0000000000000293 R14: 00000000ffffffff R15: 1ffff1103d1eaf0c
fail_dump lib/fault-inject.c:52 [inline]
should_fail+0x69e/0x7e0 lib/fault-inject.c:144
__should_failslab+0x10c/0x150 mm/failslab.c:33
should_failslab+0x9/0x20 mm/slab_common.c:1836
slab_pre_alloc_hook mm/slab.h:567 [inline]
slab_alloc_node mm/slub.c:2742 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc_trace+0x2d/0x290 mm/slub.c:2854
kmem_cache_alloc_node_trace include/linux/slab.h:444 [inline]
kmalloc_node include/linux/slab.h:594 [inline]
kzalloc_node include/linux/slab.h:701 [inline]
__get_vm_area_node+0x181/0x330 mm/vmalloc.c:2059
__vmalloc_node_range+0xe9/0x6e0 mm/vmalloc.c:2494
__vmalloc_node mm/vmalloc.c:2554 [inline]
__vmalloc+0x45/0x50 mm/vmalloc.c:2560
bpf_prog_alloc_no_stats+0x73/0x230 kernel/bpf/core.c:88
bpf_prog_alloc+0x21/0x1f0 kernel/bpf/core.c:114
bpf_prog_load+0x5f4/0xe10 kernel/bpf/syscall.c:1678
__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
RIP: 0033:0x7f924a50e969
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:00007f9248b77038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f924a735fa0 RCX: 00007f924a50e969
RDX: 0000000000000048 RSI: 000020000000e000 RDI: 0000000000000005
RBP: 00007f9248b77090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f924a735fa0 R15: 00007ffe2ba6c998
Allocated by task 4596:
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]
bpf_prog_alloc_no_stats+0xd2/0x230 kernel/bpf/core.c:92
bpf_prog_alloc+0x21/0x1f0 kernel/bpf/core.c:114
bpf_prog_load+0x5f4/0xe10 kernel/bpf/syscall.c:1678
__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
Freed by task 3677:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:345 [inline]
__kasan_slab_free+0x1c3/0x280 mm/kasan/common.c:487
kasan_slab_free+0xe/0x10 mm/kasan/common.c:496
slab_free_hook mm/slub.c:1455 [inline]
slab_free_freelist_hook+0xb7/0x180 mm/slub.c:1494
slab_free mm/slub.c:3080 [inline]
kfree+0xbe/0x260 mm/slub.c:4071
__bpf_prog_free kernel/bpf/core.c:262 [inline]
bpf_prog_unlock_free include/linux/filter.h:902 [inline]
bpf_jit_free+0x18b/0x1f0 kernel/bpf/core.c:873
bpf_prog_free_deferred+0x2f3/0x370 kernel/bpf/core.c:2042
process_one_work+0x73b/0xcc0 kernel/workqueue.c:2290
worker_thread+0xa5c/0x13b0 kernel/workqueue.c:2436
kthread+0x31e/0x3a0 kernel/kthread.c:288
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
The buggy address belongs to the object at ffff8881e1f6f000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 456 bytes inside of
512-byte region [ffff8881e1f6f000, ffff8881e1f6f200)
The buggy address belongs to the page:
page:ffffea000787db00 refcount:1 mapcount:0 mapping:ffff8881f5c02500 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02500
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
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_slab_page+0x3c/0x3b0 mm/slub.c:343
allocate_slab mm/slub.c:1683 [inline]
new_slab+0x93/0x420 mm/slub.c:1749
new_slab_objects mm/slub.c:2505 [inline]
___slab_alloc+0x29e/0x420 mm/slub.c:2667
__slab_alloc+0x63/0xa0 mm/slub.c:2707
slab_alloc_node mm/slub.c:2792 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc_trace+0x130/0x290 mm/slub.c:2854
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:690 [inline]
bpf_prog_alloc_no_stats+0xd2/0x230 kernel/bpf/core.c:92
bpf_prog_alloc+0x21/0x1f0 kernel/bpf/core.c:114
bpf_prog_load+0x5f4/0xe10 kernel/bpf/syscall.c:1678
__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:
ffff8881e1f6f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e1f6f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881e1f6f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881e1f6f200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881e1f6f280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1ed584067 P4D 1ed584067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4624 Comm: syz.7.1442 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:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f30f4ec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e1f6f1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffdd40
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e1f6f1c0
FS: 00007f9248b776c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001de990000 CR4: 00000000003406a0
DR0: 0000000000000000 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:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
RIP: 0010:console_unlock+0x9ea/0xe80 kernel/printk/printk.c:2527
Code: 64 56 86 e8 48 73 e1 02 f6 c3 01 48 8b 5c 24 28 0f 85 61 04 00 00 e8 55 f9 15 00 e8 80 5a 00 00 48 89 5c 24 70 ff 74 24 70 9d d0 f7 ff ff e8 3c f9 15 00 48 c7 05 d1 d7 0c 05 00 00 00 00 e9
RSP: 0018:ffff8881e8f57520 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8149e019 RBX: 0000000000000293 RCX: ffff8881f30f4ec0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffff8881e8f576d0 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103d1eae94 R11: 1ffff1103d1eae94 R12: 0000000000000000
R13: ffffffff85eefb30 R14: ffffffff8267bbc0 R15: dffffc0000000000
vprintk_emit+0x1be/0x380 kernel/printk/printk.c:2032
vprintk_default+0x28/0x30 kernel/printk/printk.c:2059
vprintk_func+0x19a/0x1e0 kernel/printk/printk_safe.c:393
printk+0xcc/0x110 kernel/printk/printk.c:2092
show_mem+0x2d7/0x2e2 lib/show_mem.c:39
warn_alloc_show_mem mm/page_alloc.c:3843 [inline]
warn_alloc+0x2d7/0x300 mm/page_alloc.c:3868
__vmalloc_node_range+0x28e/0x6e0 mm/vmalloc.c:2515
__vmalloc_node mm/vmalloc.c:2554 [inline]
__vmalloc+0x45/0x50 mm/vmalloc.c:2560
bpf_prog_alloc_no_stats+0x73/0x230 kernel/bpf/core.c:88
bpf_prog_alloc+0x21/0x1f0 kernel/bpf/core.c:114
bpf_prog_load+0x5f4/0xe10 kernel/bpf/syscall.c:1678
__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
RIP: 0033:0x7f924a50e969
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:00007f9248b77038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f924a735fa0 RCX: 00007f924a50e969
RDX: 0000000000000048 RSI: 000020000000e000 RDI: 0000000000000005
RBP: 00007f9248b77090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f924a735fa0 R15: 00007ffe2ba6c998
Modules linked in:
CR2: 0000000000000000
---[ end trace 767648891962cb86 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f30f4ec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e1f6f1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffdd40
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e1f6f1c0
FS: 00007f9248b776c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001de990000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 9c 8f 44 24 20 f6 add %bl,-0x9dfdbbc(%rdi,%rcx,4)
9: 44 24 21 rex.R and $0x21,%al
c: 02 74 0b 0f add 0xf(%rbx,%rcx,1),%dh
10: 0b 48 f7 or -0x9(%rax),%ecx
13: 03 08 add (%rax),%ecx
15: 00 00 add %al,(%rax)
17: 00 74 4d bf add %dh,-0x41(%rbp,%rcx,2)
1b: 01 00 add %eax,(%rax)
1d: 00 00 add %al,(%rax)
1f: e8 90 21 17 fd call 0xfd1721b4
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 b5 e7 ff ff call 0xffffe7e4 <-- trapping instruction
2f: fa cli
30: bf 01 00 00 00 mov $0x1,%edi
35: e8 2a 23 17 fd call 0xfd172364
3a: 65 gs
3b: 48 rex.W
3c: 8b .byte 0x8b
3d: 1d .byte 0x1d
3e: 32 .byte 0x32
3f: 3c .byte 0x3c