==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: use-after-free in expire_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: use-after-free in __run_timers+0x7be/0xbe0 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881e21ff1c8 by task syz.8.2481/9713
CPU: 1 PID: 9713 Comm: syz.8.2481 Not tainted 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:preempt_latency_start kernel/sched/core.c:3996 [inline]
RIP: 0010:preempt_count_add+0x9d/0x180 kernel/sched/core.c:4019
Code: 8b 05 c3 9c bd 7e 25 ff ff ff 7f 39 d8 75 43 4c 8b 74 24 18 4c 89 f7 e8 e1 0e 07 00 85 c0 74 0a 45 31 f6 31 ff e8 d3 0e 07 00 <65> 48 8b 1d 8b 9c bd 7e 48 81 c3 78 09 00 00 48 89 d8 48 c1 e8 03
RSP: 0018:ffff8881c1c8ed20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff84573f00
RDX: ffffc90008d5c000 RSI: 0000000000000040 RDI: ffffffff812fbdbc
RBP: ffff8881c1c8f030 R08: ffffffff8153c592 R09: ffff8881c1c8f090
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11038391e08
R13: ffffffff814338ea R14: ffffffff812fbdbc R15: dffffc0000000000
unwind_next_frame+0x17c/0x1ea0 arch/x86/kernel/unwind_orc.c:423
arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2829 [inline]
slab_alloc mm/slub.c:2837 [inline]
__kmalloc+0x105/0x2e0 mm/slub.c:3909
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:690 [inline]
new_dir fs/proc/proc_sysctl.c:973 [inline]
get_subdir fs/proc/proc_sysctl.c:1018 [inline]
__register_sysctl_table+0x983/0x11d0 fs/proc/proc_sysctl.c:1361
neigh_sysctl_register+0x454/0x530 net/core/neighbour.c:3714
addrconf_sysctl_register+0xac/0x180 net/ipv6/addrconf.c:7007
ipv6_add_dev+0xb34/0x10a0 net/ipv6/addrconf.c:444
addrconf_notify+0x59b/0xe50 net/ipv6/addrconf.c:3556
notifier_call_chain kernel/notifier.c:98 [inline]
__raw_notifier_call_chain kernel/notifier.c:399 [inline]
raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406
call_netdevice_notifiers_info net/core/dev.c:1670 [inline]
call_netdevice_notifiers_extack net/core/dev.c:1682 [inline]
call_netdevice_notifiers net/core/dev.c:1696 [inline]
register_netdevice+0xeef/0x12a0 net/core/dev.c:9240
register_netdev+0x37/0x50 net/core/dev.c:9338
loopback_net_init+0x6f/0x140 drivers/net/loopback.c:214
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
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12da/0x3230 kernel/fork.c:2055
_do_fork+0x197/0x900 kernel/fork.c:2399
__do_sys_clone kernel/fork.c:2557 [inline]
__se_sys_clone kernel/fork.c:2538 [inline]
__x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f75d0a25169
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:00007f75cf08efe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f75d0c3dfa0 RCX: 00007f75d0a25169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040b04000
RBP: 00007f75d0aa62a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f75d0c3dfa0 R15: 00007fff56e01898
Allocated by task 9636:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2829 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x60/0x210 fs/inode.c:966
new_inode+0x25/0x1d0 fs/inode.c:995
shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
shmem_symlink+0x118/0x5f0 mm/shmem.c:3068
vfs_symlink+0x36c/0x500 fs/namei.c:4276
do_symlinkat+0x19b/0x400 fs/namei.c:4303
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Freed by task 17:
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+0x1b5/0x270 mm/kasan/common.c:487
slab_free_hook mm/slub.c:1455 [inline]
slab_free_freelist_hook mm/slub.c:1494 [inline]
slab_free mm/slub.c:3080 [inline]
kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
__rcu_reclaim kernel/rcu/rcu.h:222 [inline]
rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167
rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
The buggy address belongs to the object at ffff8881e21ff090
which belongs to the cache shmem_inode_cache of size 760
The buggy address is located 312 bytes inside of
760-byte region [ffff8881e21ff090, ffff8881e21ff388)
The buggy address belongs to the page:
page:ffffea0007887f00 refcount:1 mapcount:0 mapping:ffff8881f5cfe500 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cfe500
raw: 0000000000000000 0000000000120012 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+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_slab_page+0x39/0x3c0 mm/slub.c:343
allocate_slab mm/slub.c:1683 [inline]
new_slab+0x97/0x440 mm/slub.c:1749
new_slab_objects mm/slub.c:2505 [inline]
___slab_alloc+0x2fe/0x490 mm/slub.c:2667
__slab_alloc+0x62/0xa0 mm/slub.c:2707
slab_alloc_node mm/slub.c:2792 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x60/0x210 fs/inode.c:966
new_inode+0x25/0x1d0 fs/inode.c:995
shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
shmem_symlink+0x118/0x5f0 mm/shmem.c:3068
vfs_symlink+0x36c/0x500 fs/namei.c:4276
do_symlinkat+0x19b/0x400 fs/namei.c:4303
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
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:
ffff8881e21ff080: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e21ff100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881e21ff180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881e21ff200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e21ff280: 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 1d76db067 P4D 1d76db067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9713 Comm: syz.8.2481 Tainted: G B 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881d7d03f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e21ff1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000100001070
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e21ff1c0
FS: 00007f75cf08f6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ecef3000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000400000000300 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:preempt_latency_start kernel/sched/core.c:3996 [inline]
RIP: 0010:preempt_count_add+0x9d/0x180 kernel/sched/core.c:4019
Code: 8b 05 c3 9c bd 7e 25 ff ff ff 7f 39 d8 75 43 4c 8b 74 24 18 4c 89 f7 e8 e1 0e 07 00 85 c0 74 0a 45 31 f6 31 ff e8 d3 0e 07 00 <65> 48 8b 1d 8b 9c bd 7e 48 81 c3 78 09 00 00 48 89 d8 48 c1 e8 03
RSP: 0018:ffff8881c1c8ed20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff84573f00
RDX: ffffc90008d5c000 RSI: 0000000000000040 RDI: ffffffff812fbdbc
RBP: ffff8881c1c8f030 R08: ffffffff8153c592 R09: ffff8881c1c8f090
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11038391e08
R13: ffffffff814338ea R14: ffffffff812fbdbc R15: dffffc0000000000
unwind_next_frame+0x17c/0x1ea0 arch/x86/kernel/unwind_orc.c:423
arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2829 [inline]
slab_alloc mm/slub.c:2837 [inline]
__kmalloc+0x105/0x2e0 mm/slub.c:3909
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:690 [inline]
new_dir fs/proc/proc_sysctl.c:973 [inline]
get_subdir fs/proc/proc_sysctl.c:1018 [inline]
__register_sysctl_table+0x983/0x11d0 fs/proc/proc_sysctl.c:1361
neigh_sysctl_register+0x454/0x530 net/core/neighbour.c:3714
addrconf_sysctl_register+0xac/0x180 net/ipv6/addrconf.c:7007
ipv6_add_dev+0xb34/0x10a0 net/ipv6/addrconf.c:444
addrconf_notify+0x59b/0xe50 net/ipv6/addrconf.c:3556
notifier_call_chain kernel/notifier.c:98 [inline]
__raw_notifier_call_chain kernel/notifier.c:399 [inline]
raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406
call_netdevice_notifiers_info net/core/dev.c:1670 [inline]
call_netdevice_notifiers_extack net/core/dev.c:1682 [inline]
call_netdevice_notifiers net/core/dev.c:1696 [inline]
register_netdevice+0xeef/0x12a0 net/core/dev.c:9240
register_netdev+0x37/0x50 net/core/dev.c:9338
loopback_net_init+0x6f/0x140 drivers/net/loopback.c:214
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
copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
copy_process+0x12da/0x3230 kernel/fork.c:2055
_do_fork+0x197/0x900 kernel/fork.c:2399
__do_sys_clone kernel/fork.c:2557 [inline]
__se_sys_clone kernel/fork.c:2538 [inline]
__x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f75d0a25169
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:00007f75cf08efe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f75d0c3dfa0 RCX: 00007f75d0a25169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040b04000
RBP: 00007f75d0aa62a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f75d0c3dfa0 R15: 00007fff56e01898
Modules linked in:
CR2: 0000000000000000
---[ end trace 9304255c885413a1 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881d7d03f00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e21ff1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000100001070
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e21ff1c0
FS: 00007f75cf08f6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ecef3000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000400000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 8b 05 c3 9c bd 7e mov 0x7ebd9cc3(%rip),%eax # 0x7ebd9cc9
6: 25 ff ff ff 7f and $0x7fffffff,%eax
b: 39 d8 cmp %ebx,%eax
d: 75 43 jne 0x52
f: 4c 8b 74 24 18 mov 0x18(%rsp),%r14
14: 4c 89 f7 mov %r14,%rdi
17: e8 e1 0e 07 00 call 0x70efd
1c: 85 c0 test %eax,%eax
1e: 74 0a je 0x2a
20: 45 31 f6 xor %r14d,%r14d
23: 31 ff xor %edi,%edi
25: e8 d3 0e 07 00 call 0x70efd
* 2a: 65 48 8b 1d 8b 9c bd mov %gs:0x7ebd9c8b(%rip),%rbx # 0x7ebd9cbd <-- trapping instruction
31: 7e
32: 48 81 c3 78 09 00 00 add $0x978,%rbx
39: 48 89 d8 mov %rbx,%rax
3c: 48 c1 e8 03 shr $0x3,%rax