==================================================================
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+0x759/0xb60 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881da2771c8 by task syz.5.245/1352
CPU: 0 PID: 1352 Comm: syz.5.245 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_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+0x759/0xb60 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:find_stack lib/stackdepot.c:185 [inline]
RIP: 0010:stack_depot_save+0x164/0x4c0 lib/stackdepot.c:245
Code: 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 08 75 f1 <45> 39 7d 0c 75 eb 31 c9 49 8b 34 ce 49 3b 74 cd 18 75 de 48 ff c1
RSP: 0018:ffff8881e780f480 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 000000000002bbe0 RCX: 00000000c3c67aa7
RDX: 0000000000082a20 RSI: 00000000ebacded8 RDI: 000000000000000e
RBP: ffff8881e780f4d0 R08: 00000000a51311c9 R09: 00000000e9235062
R10: 0000000098228d56 R11: 000000009229969f R12: 000000001502bbe0
R13: ffff8881d7e07950 R14: ffff8881e780f500 R15: 000000000000000e
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x1c3/0x200 mm/kasan/common.c:529
kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537
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_track_caller+0x10d/0x2d0 mm/slub.c:4449
__kmalloc_reserve net/core/skbuff.c:142 [inline]
pskb_expand_head+0x123/0x1110 net/core/skbuff.c:1653
skb_ensure_writable+0x2e7/0x460 net/core/skbuff.c:5569
__bpf_try_make_writable net/core/filter.c:1635 [inline]
bpf_try_make_writable net/core/filter.c:1641 [inline]
bpf_try_make_head_writable net/core/filter.c:1649 [inline]
____bpf_clone_redirect net/core/filter.c:2145 [inline]
bpf_clone_redirect+0x10b/0x380 net/core/filter.c:2123
bpf_prog_6893982b85ceadf7+0x4b1/0x1000
bpf_call_func include/linux/filter.h:627 [inline]
bpf_test_run+0x1ea/0x5d0 net/bpf/test_run.c:44
bpf_prog_test_run_skb+0x721/0xdc0 net/bpf/test_run.c:311
bpf_prog_test_run+0x21a/0x2a0 kernel/bpf/syscall.c:2124
__do_sys_bpf kernel/bpf/syscall.c:2909 [inline]
__se_sys_bpf+0x49a/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: 0033:0x7f3ec6adf969
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:00007f3ec5148038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f3ec6d06fa0 RCX: 00007f3ec6adf969
RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007f3ec6b61ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3ec6d06fa0 R15: 00007ffdebf237d8
Allocated by task 1080:
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_slab_alloc+0x12/0x20 mm/kasan/common.c:537
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+0xe2/0x270 mm/slub.c:2842
shmem_alloc_inode+0x1a/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x62/0x210 fs/inode.c:966
new_inode+0x28/0x1e0 fs/inode.c:995
shmem_get_inode+0x107/0x630 mm/shmem.c:2252
shmem_mknod+0x5c/0x1c0 mm/shmem.c:2844
shmem_create+0x2b/0x40 mm/shmem.c:2904
lookup_open fs/namei.c:3379 [inline]
do_last fs/namei.c:3471 [inline]
path_openat+0x1603/0x35c0 fs/namei.c:3683
do_filp_open+0x1ae/0x3f0 fs/namei.c:3713
do_sys_open+0x2bb/0x5d0 fs/open.c:1123
__do_sys_openat fs/open.c:1150 [inline]
__se_sys_openat fs/open.c:1144 [inline]
__x64_sys_openat+0xa2/0xb0 fs/open.c:1144
do_syscall_64+0xcf/0x170 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+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]
kmem_cache_free+0x10c/0x2c0 mm/slub.c:3096
shmem_free_in_core_inode+0x90/0xb0 mm/shmem.c:3729
i_callback+0x4c/0x70 fs/inode.c:220
__rcu_reclaim kernel/rcu/rcu.h:222 [inline]
rcu_do_batch+0x446/0x980 kernel/rcu/tree.c:2167
rcu_core+0x4bd/0xbd0 kernel/rcu/tree.c:2387
rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2396
__do_softirq+0x236/0x660 kernel/softirq.c:292
The buggy address belongs to the object at ffff8881da277090
which belongs to the cache shmem_inode_cache of size 760
The buggy address is located 312 bytes inside of
760-byte region [ffff8881da277090, ffff8881da277388)
The buggy address belongs to the page:
page:ffffea0007689d00 refcount:1 mapcount:0 mapping:ffff8881f5d03900 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5d03900
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+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+0x12c/0x270 mm/slub.c:2842
shmem_alloc_inode+0x1a/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x62/0x210 fs/inode.c:966
new_inode+0x28/0x1e0 fs/inode.c:995
shmem_get_inode+0x107/0x630 mm/shmem.c:2252
shmem_mknod+0x5c/0x1c0 mm/shmem.c:2844
shmem_create+0x2b/0x40 mm/shmem.c:2904
lookup_open fs/namei.c:3379 [inline]
do_last fs/namei.c:3471 [inline]
path_openat+0x1603/0x35c0 fs/namei.c:3683
do_filp_open+0x1ae/0x3f0 fs/namei.c:3713
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:
ffff8881da277080: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881da277100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881da277180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881da277200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881da277280: 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 1e4a01067 P4D 1e4a01067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1352 Comm: syz.5.245 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: 00010002
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881ec8fbf00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881da2771c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffada0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881da2771c0
FS: 00007f3ec51486c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d6b68000 CR4: 00000000003406b0
DR0: 0000200000000300 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:1488 [inline]
__run_timers+0x84b/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:find_stack lib/stackdepot.c:185 [inline]
RIP: 0010:stack_depot_save+0x164/0x4c0 lib/stackdepot.c:245
Code: 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 08 75 f1 <45> 39 7d 0c 75 eb 31 c9 49 8b 34 ce 49 3b 74 cd 18 75 de 48 ff c1
RSP: 0018:ffff8881e780f480 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 000000000002bbe0 RCX: 00000000c3c67aa7
RDX: 0000000000082a20 RSI: 00000000ebacded8 RDI: 000000000000000e
RBP: ffff8881e780f4d0 R08: 00000000a51311c9 R09: 00000000e9235062
R10: 0000000098228d56 R11: 000000009229969f R12: 000000001502bbe0
R13: ffff8881d7e07950 R14: ffff8881e780f500 R15: 000000000000000e
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x1c3/0x200 mm/kasan/common.c:529
kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537
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_track_caller+0x10d/0x2d0 mm/slub.c:4449
__kmalloc_reserve net/core/skbuff.c:142 [inline]
pskb_expand_head+0x123/0x1110 net/core/skbuff.c:1653
skb_ensure_writable+0x2e7/0x460 net/core/skbuff.c:5569
__bpf_try_make_writable net/core/filter.c:1635 [inline]
bpf_try_make_writable net/core/filter.c:1641 [inline]
bpf_try_make_head_writable net/core/filter.c:1649 [inline]
____bpf_clone_redirect net/core/filter.c:2145 [inline]
bpf_clone_redirect+0x10b/0x380 net/core/filter.c:2123
bpf_prog_6893982b85ceadf7+0x4b1/0x1000
bpf_call_func include/linux/filter.h:627 [inline]
bpf_test_run+0x1ea/0x5d0 net/bpf/test_run.c:44
bpf_prog_test_run_skb+0x721/0xdc0 net/bpf/test_run.c:311
bpf_prog_test_run+0x21a/0x2a0 kernel/bpf/syscall.c:2124
__do_sys_bpf kernel/bpf/syscall.c:2909 [inline]
__se_sys_bpf+0x49a/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: 0033:0x7f3ec6adf969
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:00007f3ec5148038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f3ec6d06fa0 RCX: 00007f3ec6adf969
RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007f3ec6b61ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3ec6d06fa0 R15: 00007ffdebf237d8
Modules linked in:
CR2: 0000000000000000
---[ end trace 0852cef66a4964ed ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010002
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881ec8fbf00
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881da2771c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffada0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881da2771c0
FS: 00007f3ec51486c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001d6b68000 CR4: 00000000003406b0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 44 89 e3 mov %r12d,%ebx
3: 81 e3 ff ff 0f 00 and $0xfffff,%ebx
9: 4c 8b 2c dd 80 18 5c mov -0x79a3e780(,%rbx,8),%r13
10: 86
11: 4d 85 ed test %r13,%r13
14: 74 59 je 0x6f
16: 44 89 ff mov %r15d,%edi
19: eb 09 jmp 0x24
1b: 4d 8b 6d 00 mov 0x0(%r13),%r13
1f: 4d 85 ed test %r13,%r13
22: 74 4b je 0x6f
24: 45 39 65 08 cmp %r12d,0x8(%r13)
28: 75 f1 jne 0x1b
* 2a: 45 39 7d 0c cmp %r15d,0xc(%r13) <-- trapping instruction
2e: 75 eb jne 0x1b
30: 31 c9 xor %ecx,%ecx
32: 49 8b 34 ce mov (%r14,%rcx,8),%rsi
36: 49 3b 74 cd 18 cmp 0x18(%r13,%rcx,8),%rsi
3b: 75 de jne 0x1b
3d: 48 ff c1 inc %rcx