==================================================================
BUG: KASAN: slab-out-of-bounds in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: slab-out-of-bounds in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: slab-out-of-bounds in expire_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: slab-out-of-bounds in __run_timers+0x7be/0xbe0 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881eae631c8 by task syz.0.545/2460
CPU: 0 PID: 2460 Comm: syz.0.545 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d8/0x241 lib/dump_stack.c:118
print_address_description+0x8c/0x600 mm/kasan/report.c:384
__kasan_report+0xf3/0x120 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:653
__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+0x7be/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:pte_none arch/x86/include/asm/pgtable.h:725 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1069 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1222 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1251 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1272 [inline]
RIP: 0010:unmap_page_range+0xb65/0x2620 mm/memory.c:1293
Code: 81 c6 00 10 00 00 4c 89 74 24 08 49 89 de 49 c1 ee 03 43 80 3c 26 00 74 08 48 89 df e8 c4 5b 09 00 48 89 5c 24 10 4d 8b 7d 00 <4c> 89 fe 48 83 e6 9f 31 ff e8 dd 74 d9 ff 4c 89 f8 48 83 e0 9f 4c
RSP: 0018:ffff8881dc7475a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff818ad946 RBX: ffff8881d8e56140 RCX: ffff8881da8e8000
RDX: 0000000000000000 RSI: 00000000000001fe RDI: 0000000000000020
RBP: ffff8881dc747790 R08: ffffffff818d6489 R09: fffff94000ee0427
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881d8e56140 R14: 1ffff1103b1cac28 R15: 80000001dc085007
unmap_single_vma mm/memory.c:1338 [inline]
unmap_vmas+0x355/0x4b0 mm/memory.c:1370
exit_mmap+0x2bc/0x520 mm/mmap.c:3191
__mmput+0x8e/0x2c0 kernel/fork.c:1101
exit_mm kernel/exit.c:538 [inline]
do_exit+0xc08/0x2bc0 kernel/exit.c:848
do_group_exit+0x138/0x300 kernel/exit.c:984
get_signal+0xdb1/0x1440 kernel/signal.c:2738
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f9e989a1169
Code: Bad RIP value.
RSP: 002b:00007f9e96fea0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f9e98bba088 RCX: 00007f9e989a1169
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9e98bba08c
RBP: 00007f9e98bba080 R08: 00007ffe307fb0b0 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f9e98bba08c
R13: 0000000000000000 R14: 00007ffe307e80f0 R15: 00007ffe307e81d8
The buggy address belongs to the page:
page:ffffea0007ab9800 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 0x140dc0(GFP_USER|__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+0x18f/0x370 mm/page_alloc.c:2171
get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
__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+0x2a/0x100 mm/slab_common.c:1358
kmalloc_large include/linux/slab.h:485 [inline]
kmalloc include/linux/slab.h:549 [inline]
kzalloc include/linux/slab.h:690 [inline]
tipc_nametbl_init+0x94/0x260 net/tipc/name_table.c:738
tipc_init_net+0x22d/0x360 net/tipc/core.c:74
ops_init+0x1d4/0x4a0 net/core/net_namespace.c:141
setup_net+0x214/0x990 net/core/net_namespace.c:348
copy_net_ns+0x30d/0x510 net/core/net_namespace.c:489
create_new_namespaces+0x47a/0x570 kernel/nsproxy.c:103
unshare_nsproxy_namespaces+0x119/0x170 kernel/nsproxy.c:202
ksys_unshare+0x544/0x990 kernel/fork.c:2908
__do_sys_unshare kernel/fork.c:2976 [inline]
__se_sys_unshare kernel/fork.c:2974 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:2974
do_syscall_64+0xca/0x1c0 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+0x847/0x950 mm/page_alloc.c:1438
free_the_page mm/page_alloc.c:4955 [inline]
__free_pages+0x91/0x140 mm/page_alloc.c:4961
bpf_check+0x8aeb/0xb3e0 kernel/bpf/verifier.c:9731
bpf_prog_load kernel/bpf/syscall.c:1724 [inline]
__do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
__se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Memory state around the buggy address:
ffff8881eae63080: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff8881eae63100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff8881eae63180: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffff8881eae63200: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
ffff8881eae63280: 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 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2460 Comm: syz.0.545 Tainted: G B 5.4.290-syzkaller-00002-g41adfeb3d639 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881da8e8000
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881eae631c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb5d0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eae631c0
FS: 00007f9e96fea6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ed96d000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1493 [inline]
__run_timers+0x879/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:pte_none arch/x86/include/asm/pgtable.h:725 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1069 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1222 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1251 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1272 [inline]
RIP: 0010:unmap_page_range+0xb65/0x2620 mm/memory.c:1293
Code: 81 c6 00 10 00 00 4c 89 74 24 08 49 89 de 49 c1 ee 03 43 80 3c 26 00 74 08 48 89 df e8 c4 5b 09 00 48 89 5c 24 10 4d 8b 7d 00 <4c> 89 fe 48 83 e6 9f 31 ff e8 dd 74 d9 ff 4c 89 f8 48 83 e0 9f 4c
RSP: 0018:ffff8881dc7475a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff818ad946 RBX: ffff8881d8e56140 RCX: ffff8881da8e8000
RDX: 0000000000000000 RSI: 00000000000001fe RDI: 0000000000000020
RBP: ffff8881dc747790 R08: ffffffff818d6489 R09: fffff94000ee0427
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881d8e56140 R14: 1ffff1103b1cac28 R15: 80000001dc085007
unmap_single_vma mm/memory.c:1338 [inline]
unmap_vmas+0x355/0x4b0 mm/memory.c:1370
exit_mmap+0x2bc/0x520 mm/mmap.c:3191
__mmput+0x8e/0x2c0 kernel/fork.c:1101
exit_mm kernel/exit.c:538 [inline]
do_exit+0xc08/0x2bc0 kernel/exit.c:848
do_group_exit+0x138/0x300 kernel/exit.c:984
get_signal+0xdb1/0x1440 kernel/signal.c:2738
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f9e989a1169
Code: Bad RIP value.
RSP: 002b:00007f9e96fea0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f9e98bba088 RCX: 00007f9e989a1169
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9e98bba08c
RBP: 00007f9e98bba080 R08: 00007ffe307fb0b0 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f9e98bba08c
R13: 0000000000000000 R14: 00007ffe307e80f0 R15: 00007ffe307e81d8
Modules linked in:
CR2: 0000000000000000
---[ end trace b194bd948d9b2f23 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881da8e8000
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881eae631c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb5d0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eae631c0
FS: 00007f9e96fea6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ed96d000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 81 c6 00 10 00 00 add $0x1000,%esi
6: 4c 89 74 24 08 mov %r14,0x8(%rsp)
b: 49 89 de mov %rbx,%r14
e: 49 c1 ee 03 shr $0x3,%r14
12: 43 80 3c 26 00 cmpb $0x0,(%r14,%r12,1)
17: 74 08 je 0x21
19: 48 89 df mov %rbx,%rdi
1c: e8 c4 5b 09 00 call 0x95be5
21: 48 89 5c 24 10 mov %rbx,0x10(%rsp)
26: 4d 8b 7d 00 mov 0x0(%r13),%r15
* 2a: 4c 89 fe mov %r15,%rsi <-- trapping instruction
2d: 48 83 e6 9f and $0xffffffffffffff9f,%rsi
31: 31 ff xor %edi,%edi
33: e8 dd 74 d9 ff call 0xffd97515
38: 4c 89 f8 mov %r15,%rax
3b: 48 83 e0 9f and $0xffffffffffffff9f,%rax
3f: 4c rex.WR