==================================================================
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 ffff8881ebb4f1c8 by task syz.9.945/3844
CPU: 0 PID: 3844 Comm: syz.9.945 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:page_dup_rmap include/linux/rmap.h:208 [inline]
RIP: 0010:copy_one_pte mm/memory.c:805 [inline]
RIP: 0010:copy_pte_range mm/memory.c:855 [inline]
RIP: 0010:copy_pmd_range mm/memory.c:906 [inline]
RIP: 0010:copy_pud_range mm/memory.c:940 [inline]
RIP: 0010:copy_p4d_range mm/memory.c:962 [inline]
RIP: 0010:copy_page_range+0xe62/0x1730 mm/memory.c:1024
Code: e8 13 fb da ff 41 f6 c5 01 0f 85 95 02 00 00 e8 34 f7 da ff 4d 89 f5 49 8d 7d 34 be 04 00 00 00 e8 73 cb 08 00 f0 41 ff 45 34 <4c> 89 f7 48 83 c7 30 be 04 00 00 00 e8 5d cb 08 00 f0 41 ff 46 30
RSP: 0018:ffff8881e8e4f840 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81848701 RBX: ffffea0007653808 RCX: ffffffff818487bd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea0007653834
RBP: ffff8881e8e4fa50 R08: dffffc0000000000 R09: fffff94000eca707
R10: fffff94000eca707 R11: 1ffffd4000eca706 R12: 1ffffd4000eca701
R13: ffffea0007653800 R14: ffffea0007653800 R15: 80000001d94e0007
dup_mmap kernel/fork.c:608 [inline]
dup_mm kernel/fork.c:1379 [inline]
copy_mm+0xb65/0x1150 kernel/fork.c:1435
copy_process+0x1163/0x2cf0 kernel/fork.c:2052
_do_fork+0x190/0x860 kernel/fork.c:2399
__do_sys_clone kernel/fork.c:2557 [inline]
__se_sys_clone kernel/fork.c:2538 [inline]
__x64_sys_clone+0x12e/0x160 kernel/fork.c:2538
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f7e0fbd2969
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:00007f7e0e23afe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f7e0fdf9fa0 RCX: 00007f7e0fbd2969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000042164000
RBP: 00007f7e0fc54ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7e0fdf9fa0 R15: 00007ffc29391168
Allocated by task 3765:
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
__kmalloc+0x12a/0x2f0 mm/slub.c:3913
kmalloc_array include/linux/slab.h:618 [inline]
realloc_stack_state kernel/bpf/verifier.c:595 [inline]
realloc_func_state+0x305/0x5b0 kernel/bpf/verifier.c:611
copy_func_state kernel/bpf/verifier.c:704 [inline]
copy_verifier_state+0x65f/0xc20 kernel/bpf/verifier.c:751
push_stack+0x156/0x480 kernel/bpf/verifier.c:819
check_cond_jmp_op+0x5c3/0x17f0 kernel/bpf/verifier.c:6192
do_check+0x5058/0x8a60 kernel/bpf/verifier.c:8109
bpf_check+0x208a/0x9cf0 kernel/bpf/verifier.c:9637
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
Freed by task 3765:
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
free_func_state kernel/bpf/verifier.c:671 [inline]
free_verifier_state+0xd6/0x220 kernel/bpf/verifier.c:688
pop_stack kernel/bpf/verifier.c:795 [inline]
do_check+0x65d1/0x8a60 kernel/bpf/verifier.c:8098
bpf_check+0x208a/0x9cf0 kernel/bpf/verifier.c:9637
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
The buggy address belongs to the object at ffff8881ebb4f000
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 200 bytes to the right of
256-byte region [ffff8881ebb4f000, ffff8881ebb4f100)
The buggy address belongs to the page:
page:ffffea0007aed380 refcount:1 mapcount:0 mapping:ffff8881f5c02780 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02780
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, 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]
__kmalloc+0x176/0x2f0 mm/slub.c:3909
kmalloc_array include/linux/slab.h:618 [inline]
realloc_stack_state kernel/bpf/verifier.c:595 [inline]
realloc_func_state+0x305/0x5b0 kernel/bpf/verifier.c:611
copy_func_state kernel/bpf/verifier.c:704 [inline]
copy_verifier_state+0x65f/0xc20 kernel/bpf/verifier.c:751
push_stack+0x156/0x480 kernel/bpf/verifier.c:819
check_cond_jmp_op+0x5c3/0x17f0 kernel/bpf/verifier.c:6192
do_check+0x5058/0x8a60 kernel/bpf/verifier.c:8109
bpf_check+0x208a/0x9cf0 kernel/bpf/verifier.c:9637
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
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:
ffff8881ebb4f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881ebb4f100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881ebb4f180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881ebb4f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881ebb4f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d6dd1067 P4D 1d6dd1067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3795 Comm: syz.9.930 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: ffff8881df6aaf40
RDX: 0000000080000102 RSI: 0000000000000000 RDI: ffff8881ebb4f1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffb058
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ebb4f1c0
FS: 00007f7e0e21a6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e1135000 CR4: 00000000003406b0
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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x51/0x80 kernel/locking/spinlock.c:191
Code: 89 fe 48 c7 c7 b0 2d cb 85 e8 ab 7f 62 fd 4c 89 f7 48 83 3d 40 34 a0 01 00 74 34 e8 0d 38 1d fd 66 90 48 89 5d e8 ff 75 e8 9d 01 00 00 00 e8 e5 7a 16 fd 65 8b 05 fa 93 d7 7b 85 c0 74 09 48
RSP: 0018:ffff8881db8c6da8 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: 0000000000000a06 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000a06 RDI: ffffffff862911c0
RBP: ffff8881db8c6dc0 R08: dffffc0000000000 R09: fffff94000e3b901
R10: fffff94000e3b901 R11: 1ffffd4000e3b900 R12: dffffc0000000000
R13: ffff8881f6e55318 R14: 1ffff1103edcaa54 R15: 0000000000000a06
spin_unlock_irqrestore include/linux/spinlock.h:393 [inline]
pagevec_lru_move_fn+0x17e/0x210 mm/swap.c:214
__pagevec_lru_add mm/swap.c:966 [inline]
__lru_cache_add+0x1d1/0x250 mm/swap.c:406
lru_cache_add_anon+0xe5/0x110 mm/swap.c:418
shmem_getpage_gfp+0x1562/0x2370 mm/shmem.c:1899
shmem_getpage mm/shmem.c:154 [inline]
shmem_write_begin+0xce/0x1b0 mm/shmem.c:2447
generic_perform_write+0x2b8/0x500 mm/filemap.c:3450
__generic_file_write_iter+0x24b/0x480 mm/filemap.c:3579
generic_file_write_iter+0x48d/0x620 mm/filemap.c:3611
call_write_iter include/linux/fs.h:1991 [inline]
new_sync_write fs/read_write.c:483 [inline]
__vfs_write+0x480/0x5d0 fs/read_write.c:496
__kernel_write+0xea/0x320 fs/read_write.c:515
dump_emit+0x1c0/0x2c0 fs/coredump.c:838
elf_core_dump+0x3465/0x3bd0 fs/binfmt_elf.c:2352
do_coredump+0x1d8c/0x2ab0 fs/coredump.c:801
get_signal+0xdb7/0x13d0 kernel/signal.c:2732
do_signal+0xad/0xda0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc4/0x1b0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194
ret_from_intr+0x1c/0x1c
RIP: 0033:0x0
Code: Bad RIP value.
RSP: 002b:0000200000000148 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f7e0fdfa080 RCX: 00007f7e0fbd2969
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000020000
RBP: 00007f7e0fc54ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7e0fdfa080 R15: 00007ffc29391168
Modules linked in:
CR2: 0000000000000000
---[ end trace 430bbba29a2ab6a9 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000102 RCX: ffff8881df6aaf40
RDX: 0000000080000102 RSI: 0000000000000000 RDI: ffff8881ebb4f1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffb058
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ebb4f1c0
FS: 00007f7e0e21a6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e1135000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: e8 13 fb da ff call 0xffdafb18
5: 41 f6 c5 01 test $0x1,%r13b
9: 0f 85 95 02 00 00 jne 0x2a4
f: e8 34 f7 da ff call 0xffdaf748
14: 4d 89 f5 mov %r14,%r13
17: 49 8d 7d 34 lea 0x34(%r13),%rdi
1b: be 04 00 00 00 mov $0x4,%esi
20: e8 73 cb 08 00 call 0x8cb98
25: f0 41 ff 45 34 lock incl 0x34(%r13)
* 2a: 4c 89 f7 mov %r14,%rdi <-- trapping instruction
2d: 48 83 c7 30 add $0x30,%rdi
31: be 04 00 00 00 mov $0x4,%esi
36: e8 5d cb 08 00 call 0x8cb98
3b: f0 41 ff 46 30 lock incl 0x30(%r14)