[syzbot] linux-next boot error: KASAN: null-ptr-deref Read in task_nr_scan_windows

From: syzbot
Date: Mon May 09 2022 - 08:25:32 EST

Hello,

syzbot found the following issue on:

HEAD commit: ab38272e9973 Add linux-next specific files for 20220509
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=172b96faf00000
kernel config: https://syzkaller.appspot.com/x/.config?x=90245b9bee07a551
dashboard link: https://syzkaller.appspot.com/bug?extid=755d763a1d9f7bdb1729
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+755d763a1d9f7bdb1729@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: null-ptr-deref in atomic_long_read include/linux/atomic/atomic-instrumented.h:1265 [inline]
BUG: KASAN: null-ptr-deref in get_mm_counter include/linux/mm.h:1996 [inline]
BUG: KASAN: null-ptr-deref in get_mm_rss include/linux/mm.h:2049 [inline]
BUG: KASAN: null-ptr-deref in task_nr_scan_windows.isra.0+0x23/0x120 kernel/sched/fair.c:1123
Read of size 8 at addr 00000000000003f0 by task swapper/0/1

CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.18.0-rc6-next-20220509-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_report mm/kasan/report.c:432 [inline]
kasan_report.cold+0x61/0x1c6 mm/kasan/report.c:491
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:71 [inline]
atomic_long_read include/linux/atomic/atomic-instrumented.h:1265 [inline]
get_mm_counter include/linux/mm.h:1996 [inline]
get_mm_rss include/linux/mm.h:2049 [inline]
task_nr_scan_windows.isra.0+0x23/0x120 kernel/sched/fair.c:1123
task_scan_min kernel/sched/fair.c:1144 [inline]
task_scan_start+0x6c/0x400 kernel/sched/fair.c:1150
task_tick_numa kernel/sched/fair.c:2944 [inline]
task_tick_fair+0xaeb/0xef0 kernel/sched/fair.c:11186
scheduler_tick+0x20a/0x5e0 kernel/sched/core.c:5380
update_process_times+0x191/0x200 kernel/time/timer.c:1816
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1481
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:in_gate_area_no_mm+0x0/0x70 arch/x86/entry/vsyscall/vsyscall_64.c:344
Code: 48 89 df e8 02 ee 79 00 48 39 eb 76 ce e8 88 ea 79 00 44 89 e0 5b 5d 41 5c c3 e8 eb 65 c6 00 e9 67 ff ff ff 66 0f 1f 44 00 00 <41> 54 55 53 48 89 fb e8 64 ea 79 00 8b 2d 36 1c 7e 0a bf 02 00 00
RSP: 0000:ffffc90000067810 EFLAGS: 00000202
RAX: dffffc0000000000 RBX: ffffffff8f04214d RCX: 0000000000000000
RDX: 1ffff9200000cf17 RSI: ffffc90000067d88 RDI: ffffffff8f04214d
RBP: ffffffff8f04214d R08: ffffffff8e3eaa6a R09: ffffc900000678a4
R10: fffff5200000cf19 R11: ffffc90000067db0 R12: ffffc90000067928
R13: 0000000000000000 R14: ffff888010e80000 R15: 0000000000000000
is_kernel_text include/linux/kallsyms.h:31 [inline]
core_kernel_text+0x20/0x90 kernel/extable.c:68
kernel_text_address+0xd/0x80 kernel/extable.c:99
__kernel_text_address+0x9/0x30 kernel/extable.c:79
unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline]
unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313
arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:750 [inline]
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3222 [inline]
__kmem_cache_alloc_lru mm/slub.c:3229 [inline]
kmem_cache_alloc_lru+0x255/0x720 mm/slub.c:3246
alloc_inode_sb include/linux/fs.h:2950 [inline]
alloc_inode+0x168/0x230 fs/inode.c:262
new_inode_pseudo fs/inode.c:1018 [inline]
new_inode+0x27/0x2f0 fs/inode.c:1047
tracefs_get_inode+0x1a/0x130 fs/tracefs/inode.c:132
tracefs_create_file+0xe8/0x600 fs/tracefs/inode.c:483
event_subsystem_dir kernel/trace/trace_events.c:2333 [inline]
event_create_dir+0xc17/0x1320 kernel/trace/trace_events.c:2410
__trace_early_add_event_dirs+0x7e/0xf0 kernel/trace/trace_events.c:3478
early_event_add_tracer kernel/trace/trace_events.c:3645 [inline]
event_trace_init+0x9e/0x113 kernel/trace/trace_events.c:3805
tracer_init_tracefs+0xf9/0x457 kernel/trace/trace.c:9722
do_one_initcall+0x103/0x650 init/main.c:1301
do_initcall_level init/main.c:1376 [inline]
do_initcalls init/main.c:1392 [inline]
do_basic_setup init/main.c:1411 [inline]
kernel_init_freeable+0x6b1/0x73a init/main.c:1618
kernel_init+0x1a/0x1d0 init/main.c:1507
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>
==================================================================
----------------
Code disassembly (best guess):
0: 48 89 df mov %rbx,%rdi
3: e8 02 ee 79 00 callq 0x79ee0a
8: 48 39 eb cmp %rbp,%rbx
b: 76 ce jbe 0xffffffdb
d: e8 88 ea 79 00 callq 0x79ea9a
12: 44 89 e0 mov %r12d,%eax
15: 5b pop %rbx
16: 5d pop %rbp
17: 41 5c pop %r12
19: c3 retq
1a: e8 eb 65 c6 00 callq 0xc6660a
1f: e9 67 ff ff ff jmpq 0xffffff8b
24: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
* 2a: 41 54 push %r12 <-- trapping instruction
2c: 55 push %rbp
2d: 53 push %rbx
2e: 48 89 fb mov %rdi,%rbx
31: e8 64 ea 79 00 callq 0x79ea9a
36: 8b 2d 36 1c 7e 0a mov 0xa7e1c36(%rip),%ebp # 0xa7e1c72
3c: bf .byte 0xbf
3d: 02 00 add (%rax),%al


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