==================================================================
BUG: KASAN: slab-out-of-bounds in hlist_add_head include/linux/list.h:814 [inline]
BUG: KASAN: slab-out-of-bounds in enqueue_timer+0x9e/0x2c0 kernel/time/timer.c:541
Write of size 8 at addr ffff8881eba071c8 by task syz.0.303/1499
CPU: 0 PID: 1499 Comm: syz.0.303 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x49/0x70 kernel/locking/spinlock.c:199
Code: 12 48 89 fb 48 c7 c7 b0 2d cb 85 e8 31 7f 62 fd 48 89 df 48 83 3d c6 33 a0 01 00 74 27 e8 93 37 1d fd 66 90 fb bf 01 00 00 00 72 7a 16 fd 65 8b 05 87 93 d7 7b 85 c0 74 03 5b 5d c3 e8 7f 4d
RSP: 0018:ffff8881e943f048 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000040000002 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff8881e943f050 R08: dffffc0000000000 R09: fffffbfff0c57781
R10: fffffbfff0c57781 R11: 1ffffffff0c57780 R12: ffff8881f6e57b40
R13: ffff8881e3cf0ff8 R14: 0000000000000000 R15: ffff8881eae72f40
finish_lock_switch kernel/sched/core.c:3349 [inline]
finish_task_switch+0x12e/0x590 kernel/sched/core.c:3449
context_switch kernel/sched/core.c:3613 [inline]
__schedule+0xa57/0x12a0 kernel/sched/core.c:4309
preempt_schedule_irq+0x9b/0x110 kernel/sched/core.c:4560
retint_kernel+0x1b/0x1b
RIP: 0010:find_stack lib/stackdepot.c:183 [inline]
RIP: 0010:stack_depot_save+0x14b/0x4c0 lib/stackdepot.c:245
Code: e6 c1 c6 04 29 f1 41 31 cb c1 c1 0e 41 29 cb 45 31 dc 41 c1 c3 18 45 29 dc 44 89 e3 81 e3 ff ff 0f 00 4c 8b 2c dd 80 18 5c 86 <4d> 85 ed 74 59 44 89 ff eb 09 4d 8b 6d 00 4d 85 ed 74 4b 45 39 65
RSP: 0018:ffff8881e943f2f0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000091696 RCX: 00000000806fb1e1
RDX: 0000000000000800 RSI: 000000002ce0d398 RDI: 0000000000000002
RBP: ffff8881e943f340 R08: 0000000065299b0b R09: 000000004ce87342
R10: 00000000c057d926 R11: 0000000009a5809a R12: 000000001da91696
R13: ffff8881ebd4ed10 R14: ffff8881e943f350 R15: 000000000000000d
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:345 [inline]
__kasan_slab_free+0x223/0x280 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
kvfree+0x4c/0x50 mm/util.c:625
__vunmap+0x801/0x8a0 mm/vmalloc.c:2264
__vfree mm/vmalloc.c:2308 [inline]
vfree+0x61/0x90 mm/vmalloc.c:2338
bpf_check+0x8369/0x9cf0 kernel/bpf/verifier.c:9729
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
RIP: 0033:0x7f3eb2df7969
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:00007f3eb1460038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f3eb301efa0 RCX: 00007f3eb2df7969
RDX: 0000000000000080 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f3eb2e79ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3eb301efa0 R15: 00007ffc52023a38
The buggy address belongs to the page:
page:ffffea0007ae8100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
flags: 0x8000000000010000(head)
raw: 8000000000010000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 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 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
netdev_freemem+0x3f/0x60 net/core/dev.c:9583
netdev_release+0x7f/0xb0 net/core/net-sysfs.c:1743
device_release+0x70/0x1a0 drivers/base/core.c:1776
kobject_cleanup lib/kobject.c:716 [inline]
kobject_release lib/kobject.c:747 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1fe/0x2c0 lib/kobject.c:764
netdev_run_todo+0xae4/0xc70 net/core/dev.c:9488
rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112
tun_detach drivers/net/tun.c:766 [inline]
tun_chr_close+0xc4/0x140 drivers/net/tun.c:3563
__fput+0x2a3/0x730 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x146/0x170 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x195/0x1b0 arch/x86/entry/common.c:163
prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194
Memory state around the buggy address:
ffff8881eba07080: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff8881eba07100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff8881eba07180: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffff8881eba07200: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff8881eba07280: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1eb3ac067 P4D 1eb3ac067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1499 Comm: syz.0.303 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: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000102 RCX: ffff8881eae72f40
RDX: 0000000000000102 RSI: 0000000000000000 RDI: ffff8881eba071c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffa248
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eba071c0
FS: 00007f3eb14606c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ed6f0000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000200000000300 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x49/0x70 kernel/locking/spinlock.c:199
Code: 12 48 89 fb 48 c7 c7 b0 2d cb 85 e8 31 7f 62 fd 48 89 df 48 83 3d c6 33 a0 01 00 74 27 e8 93 37 1d fd 66 90 fb bf 01 00 00 00 72 7a 16 fd 65 8b 05 87 93 d7 7b 85 c0 74 03 5b 5d c3 e8 7f 4d
RSP: 0018:ffff8881e943f048 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000040000002 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff8881e943f050 R08: dffffc0000000000 R09: fffffbfff0c57781
R10: fffffbfff0c57781 R11: 1ffffffff0c57780 R12: ffff8881f6e57b40
R13: ffff8881e3cf0ff8 R14: 0000000000000000 R15: ffff8881eae72f40
finish_lock_switch kernel/sched/core.c:3349 [inline]
finish_task_switch+0x12e/0x590 kernel/sched/core.c:3449
context_switch kernel/sched/core.c:3613 [inline]
__schedule+0xa57/0x12a0 kernel/sched/core.c:4309
preempt_schedule_irq+0x9b/0x110 kernel/sched/core.c:4560
retint_kernel+0x1b/0x1b
RIP: 0010:find_stack lib/stackdepot.c:183 [inline]
RIP: 0010:stack_depot_save+0x14b/0x4c0 lib/stackdepot.c:245
Code: e6 c1 c6 04 29 f1 41 31 cb c1 c1 0e 41 29 cb 45 31 dc 41 c1 c3 18 45 29 dc 44 89 e3 81 e3 ff ff 0f 00 4c 8b 2c dd 80 18 5c 86 <4d> 85 ed 74 59 44 89 ff eb 09 4d 8b 6d 00 4d 85 ed 74 4b 45 39 65
RSP: 0018:ffff8881e943f2f0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000091696 RCX: 00000000806fb1e1
RDX: 0000000000000800 RSI: 000000002ce0d398 RDI: 0000000000000002
RBP: ffff8881e943f340 R08: 0000000065299b0b R09: 000000004ce87342
R10: 00000000c057d926 R11: 0000000009a5809a R12: 000000001da91696
R13: ffff8881ebd4ed10 R14: ffff8881e943f350 R15: 000000000000000d
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:345 [inline]
__kasan_slab_free+0x223/0x280 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
kvfree+0x4c/0x50 mm/util.c:625
__vunmap+0x801/0x8a0 mm/vmalloc.c:2264
__vfree mm/vmalloc.c:2308 [inline]
vfree+0x61/0x90 mm/vmalloc.c:2338
bpf_check+0x8369/0x9cf0 kernel/bpf/verifier.c:9729
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
RIP: 0033:0x7f3eb2df7969
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:00007f3eb1460038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f3eb301efa0 RCX: 00007f3eb2df7969
RDX: 0000000000000080 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f3eb2e79ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3eb301efa0 R15: 00007ffc52023a38
Modules linked in:
CR2: 0000000000000000
---[ end trace 54bdaf414f6f8380 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000102 RCX: ffff8881eae72f40
RDX: 0000000000000102 RSI: 0000000000000000 RDI: ffff8881eba071c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffa248
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eba071c0
FS: 00007f3eb14606c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ed6f0000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 12 48 89 adc -0x77(%rax),%cl
3: fb sti
4: 48 c7 c7 b0 2d cb 85 mov $0xffffffff85cb2db0,%rdi
b: e8 31 7f 62 fd call 0xfd627f41
10: 48 89 df mov %rbx,%rdi
13: 48 83 3d c6 33 a0 01 cmpq $0x0,0x1a033c6(%rip) # 0x1a033e1
1a: 00
1b: 74 27 je 0x44
1d: e8 93 37 1d fd call 0xfd1d37b5
22: 66 90 xchg %ax,%ax
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 72 7a 16 fd call 0xfd167aa1 <-- trapping instruction
2f: 65 8b 05 87 93 d7 7b mov %gs:0x7bd79387(%rip),%eax # 0x7bd793bd
36: 85 c0 test %eax,%eax
38: 74 03 je 0x3d
3a: 5b pop %rbx
3b: 5d pop %rbp
3c: c3 ret
3d: e8 .byte 0xe8
3e: 7f 4d jg 0x8d