==================================================================
BUG: KASAN: slab-out-of-bounds in expire_timers kernel/time/timer.c:1484 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0x7bd/0xb60 kernel/time/timer.c:1817
Read of size 8 at addr ffff8881c73af1d8 by task kworker/0:1/13
CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: rcu_gp process_srcu
Call Trace:
<IRQ>
__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_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
expire_timers kernel/time/timer.c:1484 [inline]
__run_timers+0x7bd/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
</IRQ>
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:236 [inline]
RIP: 0010:delay_tsc+0x74/0xc0 arch/x86/lib/delay.c:61
Code: 00 e8 b0 43 1b fd 65 8b 05 c5 5c dc 7b 85 c0 74 1d f3 90 bf 01 00 00 00 e8 e9 41 1b fd e8 a4 69 fa fd 41 39 c6 75 0e 0f 01 f9 <66> 90 eb bc e8 a3 16 da fc eb dc 4c 29 e3 e8 89 69 fa fd 41 89 c6
RSP: 0018:ffff8881f5defb88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 00000000cf4b9c84 RBX: 0000000000002af9 RCX: 0000000000000000
RDX: 0000000000000022 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881f5defba8 R08: dffffc0000000000 R09: ffffed103ebbdf79
R10: ffffed103ebbdf79 R11: 1ffff1103ebbdf78 R12: 00000000000016fc
R13: 0000000000000b18 R14: 0000000000000000 R15: 00000022cf4b8477
__delay arch/x86/lib/delay.c:161 [inline]
__const_udelay+0x61/0x70 arch/x86/lib/delay.c:175
try_check_zero+0x2dc/0x350 kernel/rcu/srcutree.c:708
srcu_advance_state kernel/rcu/srcutree.c:1146 [inline]
process_srcu+0x183/0xc60 kernel/rcu/srcutree.c:1241
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
Allocated by task 1773:
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]
__hw_addr_create_ex net/core/dev_addr_lists.c:30 [inline]
__hw_addr_add_ex+0x182/0x5b0 net/core/dev_addr_lists.c:76
__hw_addr_add net/core/dev_addr_lists.c:84 [inline]
dev_addr_init+0x118/0x1f0 net/core/dev_addr_lists.c:464
alloc_netdev_mqs+0x124/0xc50 net/core/dev.c:9640
__ip_tunnel_create+0x206/0x380 net/ipv4/ip_tunnel.c:254
ip_tunnel_init_net+0x277/0x710 net/ipv4/ip_tunnel.c:1076
ipgre_tap_init_net+0x29/0x30 net/ipv4/ip_gre.c:1704
ops_init+0x1ba/0x4a0 net/core/net_namespace.c:141
setup_net+0x20c/0x9b0 net/core/net_namespace.c:348
copy_net_ns+0x314/0x520 net/core/net_namespace.c:489
create_new_namespaces+0x49c/0x590 kernel/nsproxy.c:103
copy_namespaces+0x17e/0x1c0 kernel/nsproxy.c:161
copy_process+0x1194/0x2cf0 kernel/fork.c:2055
_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
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8881c73af180
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 88 bytes inside of
96-byte region [ffff8881c73af180, ffff8881c73af1e0)
The buggy address belongs to the page:
page:ffffea00071cebc0 refcount:1 mapcount:0 mapping:ffff8881f5c02f00 index:0x0
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881f5c02f00
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__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]
__hw_addr_create_ex net/core/dev_addr_lists.c:30 [inline]
__hw_addr_add_ex+0x182/0x5b0 net/core/dev_addr_lists.c:76
__hw_addr_add net/core/dev_addr_lists.c:84 [inline]
dev_addr_init+0x118/0x1f0 net/core/dev_addr_lists.c:464
alloc_netdev_mqs+0x124/0xc50 net/core/dev.c:9640
__ip_tunnel_create+0x206/0x380 net/ipv4/ip_tunnel.c:254
ip_tunnel_init_net+0x277/0x710 net/ipv4/ip_tunnel.c:1076
erspan_init_net+0x29/0x30 net/ipv4/ip_gre.c:1721
ops_init+0x1ba/0x4a0 net/core/net_namespace.c:141
setup_net+0x20c/0x9b0 net/core/net_namespace.c:348
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:
ffff8881c73af080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff8881c73af100: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff8881c73af180: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
^
ffff8881c73af200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff8881c73af280: 00 00 00 00 00 00 00 00 00 00 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 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13 Comm: kworker/0:1 Tainted: G B 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: rcu_gp process_srcu
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f5dc3f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881c73af1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0ca7a5c R11: 1ffffffff0ca7a5c R12: 00000000ffffa440
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c73af1c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
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
</IRQ>
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:236 [inline]
RIP: 0010:delay_tsc+0x74/0xc0 arch/x86/lib/delay.c:61
Code: 00 e8 b0 43 1b fd 65 8b 05 c5 5c dc 7b 85 c0 74 1d f3 90 bf 01 00 00 00 e8 e9 41 1b fd e8 a4 69 fa fd 41 39 c6 75 0e 0f 01 f9 <66> 90 eb bc e8 a3 16 da fc eb dc 4c 29 e3 e8 89 69 fa fd 41 89 c6
RSP: 0018:ffff8881f5defb88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 00000000cf4b9c84 RBX: 0000000000002af9 RCX: 0000000000000000
RDX: 0000000000000022 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881f5defba8 R08: dffffc0000000000 R09: ffffed103ebbdf79
R10: ffffed103ebbdf79 R11: 1ffff1103ebbdf78 R12: 00000000000016fc
R13: 0000000000000b18 R14: 0000000000000000 R15: 00000022cf4b8477
__delay arch/x86/lib/delay.c:161 [inline]
__const_udelay+0x61/0x70 arch/x86/lib/delay.c:175
try_check_zero+0x2dc/0x350 kernel/rcu/srcutree.c:708
srcu_advance_state kernel/rcu/srcutree.c:1146 [inline]
process_srcu+0x183/0xc60 kernel/rcu/srcutree.c:1241
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
Modules linked in:
CR2: 0000000000000000
---[ end trace c097759bf8afac8d ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f5dc3f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881c73af1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0ca7a5c R11: 1ffffffff0ca7a5c R12: 00000000ffffa440
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c73af1c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 00 e8 add %ch,%al
2: b0 43 mov $0x43,%al
4: 1b fd sbb %ebp,%edi
6: 65 8b 05 c5 5c dc 7b mov %gs:0x7bdc5cc5(%rip),%eax # 0x7bdc5cd2
d: 85 c0 test %eax,%eax
f: 74 1d je 0x2e
11: f3 90 pause
13: bf 01 00 00 00 mov $0x1,%edi
18: e8 e9 41 1b fd call 0xfd1b4206
1d: e8 a4 69 fa fd call 0xfdfa69c6
22: 41 39 c6 cmp %eax,%r14d
25: 75 0e jne 0x35
27: 0f 01 f9 rdtscp
* 2a: 66 90 xchg %ax,%ax <-- trapping instruction
2c: eb bc jmp 0xffffffea
2e: e8 a3 16 da fc call 0xfcda16d6
33: eb dc jmp 0x11
35: 4c 29 e3 sub %r12,%rbx
38: e8 89 69 fa fd call 0xfdfa69c6
3d: 41 89 c6 mov %eax,%r14d