==================================================================
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 ffff8881e01071c8 by task syz-executor/4794
CPU: 0 PID: 4794 Comm: syz-executor Tainted: G W 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:__free_pages+0xd7/0x110 mm/page_alloc.c:4963
Code: 29 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 4c 8b 6c 24 40 fa 48 89 df 4c 89 f6 e8 83 1e 00 00 4c 89 6c 24 18 ff 74 24 18 9d <48> c7 44 24 20 0e 36 e0 45 4b c7 04 27 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffff8881e399fae0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: c3c19bee75e99f00 RBX: ffffea00079d10c0 RCX: 1ffff1103c733f3c
RDX: ffffea0007537e08 RSI: ffffffff86290550 RDI: 00000000ffffffff
RBP: ffff8881e399fb88 R08: 0000000000000000 R09: fffffbfff0b81869
R10: fffffbfff0b81869 R11: 1ffffffff0b81868 R12: dffffc0000000000
R13: 0000000000000202 R14: 00000000001e7443 R15: 1ffff1103c733f60
__vunmap+0x76a/0x8a0 mm/vmalloc.c:2260
__vfree mm/vmalloc.c:2308 [inline]
vfree+0x61/0x90 mm/vmalloc.c:2338
kcov_put kernel/kcov.c:396 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:495
__fput+0x2a3/0x730 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x146/0x170 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xa43/0x2660 kernel/exit.c:861
do_group_exit+0x13e/0x300 kernel/exit.c:984
__do_sys_exit_group kernel/exit.c:995 [inline]
__se_sys_exit_group kernel/exit.c:993 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:993
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f420aed1969
Code: Bad RIP value.
RSP: 002b:00007ffd904e0268 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000043 RCX: 00007f420aed1969
RDX: 00007f420aed03e0 RSI: 0000000000000004 RDI: 0000000000000043
RBP: 00007f420b0f9738 R08: 00007ffd904de006 R09: 0000000000000008
R10: 000000000000001a R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
The buggy address belongs to the page:
page:ffffea00078041c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 ffffea0007ac2408 ffffea0007804188 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 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO)
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]
__vmalloc_area_node mm/vmalloc.c:-1 [inline]
__vmalloc_node_range+0x36a/0x6e0 mm/vmalloc.c:2499
vmalloc_user+0x73/0x80 mm/vmalloc.c:2629
kcov_mmap+0x2b/0x120 kernel/kcov.c:450
call_mmap include/linux/fs.h:1996 [inline]
mmap_region+0x101b/0x15a0 mm/mmap.c:1812
do_mmap+0x826/0xd90 mm/mmap.c:1581
do_mmap_pgoff include/linux/mm.h:2480 [inline]
vm_mmap_pgoff+0x195/0x230 mm/util.c:528
ksys_mmap_pgoff+0x16f/0x1e0 mm/mmap.c:1631
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:97 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:88 [inline]
__x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:88
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
__vunmap+0x76a/0x8a0 mm/vmalloc.c:2260
__vfree mm/vmalloc.c:2308 [inline]
vfree+0x61/0x90 mm/vmalloc.c:2338
kcov_put kernel/kcov.c:396 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:495
__fput+0x2a3/0x730 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x146/0x170 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xa43/0x2660 kernel/exit.c:861
do_group_exit+0x13e/0x300 kernel/exit.c:984
__do_sys_exit_group kernel/exit.c:995 [inline]
__se_sys_exit_group kernel/exit.c:993 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:993
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Memory state around the buggy address:
ffff8881e0107080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881e0107100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881e0107180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff8881e0107200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8881e0107280: 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 1da9e9067 P4D 1da9e9067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4794 Comm: syz-executor Tainted: G B W 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: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e7ed3f00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e01071c0
RBP: ffff8881f6e09d30 R08: dffffc0000000000 R09: ffffed103edc92a1
R10: ffffed103edc92a1 R11: 1ffff1103edc92a0 R12: 00000000ffffb508
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e01071c0
FS: 0000555588202500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dc6a7000 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: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:__free_pages+0xd7/0x110 mm/page_alloc.c:4963
Code: 29 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 4c 8b 6c 24 40 fa 48 89 df 4c 89 f6 e8 83 1e 00 00 4c 89 6c 24 18 ff 74 24 18 9d <48> c7 44 24 20 0e 36 e0 45 4b c7 04 27 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffff8881e399fae0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: c3c19bee75e99f00 RBX: ffffea00079d10c0 RCX: 1ffff1103c733f3c
RDX: ffffea0007537e08 RSI: ffffffff86290550 RDI: 00000000ffffffff
RBP: ffff8881e399fb88 R08: 0000000000000000 R09: fffffbfff0b81869
R10: fffffbfff0b81869 R11: 1ffffffff0b81868 R12: dffffc0000000000
R13: 0000000000000202 R14: 00000000001e7443 R15: 1ffff1103c733f60
__vunmap+0x76a/0x8a0 mm/vmalloc.c:2260
__vfree mm/vmalloc.c:2308 [inline]
vfree+0x61/0x90 mm/vmalloc.c:2338
kcov_put kernel/kcov.c:396 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:495
__fput+0x2a3/0x730 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x146/0x170 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xa43/0x2660 kernel/exit.c:861
do_group_exit+0x13e/0x300 kernel/exit.c:984
__do_sys_exit_group kernel/exit.c:995 [inline]
__se_sys_exit_group kernel/exit.c:993 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:993
do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f420aed1969
Code: Bad RIP value.
RSP: 002b:00007ffd904e0268 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000043 RCX: 00007f420aed1969
RDX: 00007f420aed03e0 RSI: 0000000000000004 RDI: 0000000000000043
RBP: 00007f420b0f9738 R08: 00007ffd904de006 R09: 0000000000000008
R10: 000000000000001a R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000000
---[ end trace c244bd3dd9783112 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206
RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e7ed3f00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e01071c0
RBP: ffff8881f6e09d30 R08: dffffc0000000000 R09: ffffed103edc92a1
R10: ffffed103edc92a1 R11: 1ffff1103edc92a0 R12: 00000000ffffb508
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e01071c0
FS: 0000555588202500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001dc6a7000 CR4: 00000000003406b0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 29 48 c7 sub %ecx,-0x39(%rax)
3: 44 24 40 rex.R and $0x40,%al
6: 00 00 add %al,(%rax)
8: 00 00 add %al,(%rax)
a: 9c pushf
b: 8f 44 24 40 pop 0x40(%rsp)
f: 4c 8b 6c 24 40 mov 0x40(%rsp),%r13
14: fa cli
15: 48 89 df mov %rbx,%rdi
18: 4c 89 f6 mov %r14,%rsi
1b: e8 83 1e 00 00 call 0x1ea3
20: 4c 89 6c 24 18 mov %r13,0x18(%rsp)
25: ff 74 24 18 push 0x18(%rsp)
29: 9d popf
* 2a: 48 c7 44 24 20 0e 36 movq $0x45e0360e,0x20(%rsp) <-- trapping instruction
31: e0 45
33: 4b c7 04 27 00 00 00 movq $0x0,(%r15,%r12,1)
3a: 00
3b: 65 gs
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 04 25 add $0x25,%al