==================================================================
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 ffff8881ea10b1c8 by task syz.5.774/3037
CPU: 1 PID: 3037 Comm: syz.5.774 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:check_kcov_mode kernel/kcov.c:153 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:208 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x17/0x80 kernel/kcov.c:248
Code: 48 ff c2 48 89 11 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 8b 45 08 65 48 8b 15 40 0d a3 7e 65 8b 0d 45 0d a3 7e c1 00 01 1f 00 74 02 5d c3 8b 8a 00 0a 00 00 83 f9 03 75 f3 48
RSP: 0018:ffff8881e613ef58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff814fbc64 RBX: 0000000000000010 RCX: 0000000080000001
RDX: ffff8881eb000fc0 RSI: 0000000000000010 RDI: 000000000000000b
RBP: ffff8881e613ef58 R08: dffffc0000000000 R09: ffff8881e613efc8
R10: ffffed103cc27e05 R11: 1ffff1103cc27df9 R12: ffff8881e613f080
R13: 1ffff1103cc27e12 R14: dffffc0000000000 R15: 000000000000000b
stack_trace_consume_entry+0x74/0x250 kernel/stacktrace.c:86
arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123
save_stack+0x97/0x560 mm/page_owner.c:122
__set_page_owner+0x39/0x1e0 mm/page_owner.c:191
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_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]
__get_free_pages+0xe/0x30 mm/page_alloc.c:4938
tlb_next_batch mm/mmu_gather.c:29 [inline]
__tlb_remove_page_size+0x17b/0x300 mm/mmu_gather.c:83
__tlb_remove_page include/asm-generic/tlb.h:426 [inline]
zap_pte_range mm/memory.c:1108 [inline]
zap_pmd_range mm/memory.c:1222 [inline]
zap_pud_range mm/memory.c:1251 [inline]
zap_p4d_range mm/memory.c:1272 [inline]
unmap_page_range+0xf7c/0x1b20 mm/memory.c:1293
unmap_single_vma mm/memory.c:1338 [inline]
unmap_vmas+0x245/0x340 mm/memory.c:1370
exit_mmap+0x2bb/0x520 mm/mmap.c:3191
__mmput+0x92/0x2e0 kernel/fork.c:1101
mmput+0x47/0x60 kernel/fork.c:1122
exit_mm kernel/exit.c:538 [inline]
do_exit+0x99f/0x2660 kernel/exit.c:848
do_group_exit+0x13e/0x300 kernel/exit.c:984
get_signal+0xdee/0x13d0 kernel/signal.c:2738
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
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x13e/0x170 arch/x86/entry/common.c:300
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f5397a6f969
Code: Bad RIP value.
RSP: 002b:00007f53960d80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5397c96fa8 RCX: 00007f5397a6f969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5397c96fa8
RBP: 00007f5397c96fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5397c96fac
R13: 0000000000000000 R14: 00007ffe619e1740 R15: 00007ffe619e1828
The buggy address belongs to the page:
page:ffffea0007a842c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea00074eb808 ffffea0007125808 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102cc2(GFP_HIGHUSER|__GFP_NOWARN)
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_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]
pcpu_alloc_pages mm/percpu-vm.c:94 [inline]
pcpu_populate_chunk+0x1b6/0xce0 mm/percpu-vm.c:284
pcpu_alloc+0x8ec/0x1120 mm/percpu.c:1714
__alloc_percpu_gfp+0x25/0x30 mm/percpu.c:1783
prealloc_init+0x24b/0x810 kernel/bpf/hashtab.c:154
htab_map_alloc+0x65f/0x940 kernel/bpf/hashtab.c:385
find_and_alloc_map kernel/bpf/syscall.c:122 [inline]
map_create+0x2d8/0x980 kernel/bpf/syscall.c:573
__do_sys_bpf kernel/bpf/syscall.c:2873 [inline]
__se_sys_bpf+0x2dc/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
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_pcp_prepare mm/page_alloc.c:1233 [inline]
free_unref_page_prepare+0x2a9/0x3a0 mm/page_alloc.c:3085
free_unref_page mm/page_alloc.c:3134 [inline]
free_the_page mm/page_alloc.c:4954 [inline]
__free_pages+0xaa/0x110 mm/page_alloc.c:4962
pcpu_free_pages mm/percpu-vm.c:64 [inline]
pcpu_depopulate_chunk mm/percpu-vm.c:328 [inline]
pcpu_balance_workfn+0x8c7/0x14b0 mm/percpu.c:1865
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
Memory state around the buggy address:
ffff8881ea10b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881ea10b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881ea10b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8881ea10b200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881ea10b280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
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: 1 PID: 3037 Comm: syz.5.774 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:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881eb000fc0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ea10b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa888
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ea10b1c0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406a0
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: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:check_kcov_mode kernel/kcov.c:153 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:208 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x17/0x80 kernel/kcov.c:248
Code: 48 ff c2 48 89 11 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 8b 45 08 65 48 8b 15 40 0d a3 7e 65 8b 0d 45 0d a3 7e c1 00 01 1f 00 74 02 5d c3 8b 8a 00 0a 00 00 83 f9 03 75 f3 48
RSP: 0018:ffff8881e613ef58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff814fbc64 RBX: 0000000000000010 RCX: 0000000080000001
RDX: ffff8881eb000fc0 RSI: 0000000000000010 RDI: 000000000000000b
RBP: ffff8881e613ef58 R08: dffffc0000000000 R09: ffff8881e613efc8
R10: ffffed103cc27e05 R11: 1ffff1103cc27df9 R12: ffff8881e613f080
R13: 1ffff1103cc27e12 R14: dffffc0000000000 R15: 000000000000000b
stack_trace_consume_entry+0x74/0x250 kernel/stacktrace.c:86
arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123
save_stack+0x97/0x560 mm/page_owner.c:122
__set_page_owner+0x39/0x1e0 mm/page_owner.c:191
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_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]
__get_free_pages+0xe/0x30 mm/page_alloc.c:4938
tlb_next_batch mm/mmu_gather.c:29 [inline]
__tlb_remove_page_size+0x17b/0x300 mm/mmu_gather.c:83
__tlb_remove_page include/asm-generic/tlb.h:426 [inline]
zap_pte_range mm/memory.c:1108 [inline]
zap_pmd_range mm/memory.c:1222 [inline]
zap_pud_range mm/memory.c:1251 [inline]
zap_p4d_range mm/memory.c:1272 [inline]
unmap_page_range+0xf7c/0x1b20 mm/memory.c:1293
unmap_single_vma mm/memory.c:1338 [inline]
unmap_vmas+0x245/0x340 mm/memory.c:1370
exit_mmap+0x2bb/0x520 mm/mmap.c:3191
__mmput+0x92/0x2e0 kernel/fork.c:1101
mmput+0x47/0x60 kernel/fork.c:1122
exit_mm kernel/exit.c:538 [inline]
do_exit+0x99f/0x2660 kernel/exit.c:848
do_group_exit+0x13e/0x300 kernel/exit.c:984
get_signal+0xdee/0x13d0 kernel/signal.c:2738
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
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x13e/0x170 arch/x86/entry/common.c:300
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f5397a6f969
Code: Bad RIP value.
RSP: 002b:00007f53960d80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5397c96fa8 RCX: 00007f5397a6f969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5397c96fa8
RBP: 00007f5397c96fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5397c96fac
R13: 0000000000000000 R14: 00007ffe619e1740 R15: 00007ffe619e1828
Modules linked in:
CR2: 0000000000000000
---[ end trace 1ee57b89247d551e ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881eb000fc0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ea10b1c0
RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa888
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ea10b1c0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406a0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 48 ff c2 inc %rdx
3: 48 89 11 mov %rdx,(%rcx)
6: 5d pop %rbp
7: c3 ret
8: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
f: 00 00 00 00
13: 55 push %rbp
14: 48 89 e5 mov %rsp,%rbp
17: 48 8b 45 08 mov 0x8(%rbp),%rax
1b: 65 48 8b 15 40 0d a3 mov %gs:0x7ea30d40(%rip),%rdx # 0x7ea30d63
22: 7e
23: 65 8b 0d 45 0d a3 7e mov %gs:0x7ea30d45(%rip),%ecx # 0x7ea30d6f
* 2a: f7 c1 00 01 1f 00 test $0x1f0100,%ecx <-- trapping instruction
30: 74 02 je 0x34
32: 5d pop %rbp
33: c3 ret
34: 8b 8a 00 0a 00 00 mov 0xa00(%rdx),%ecx
3a: 83 f9 03 cmp $0x3,%ecx
3d: 75 f3 jne 0x32
3f: 48 rex.W