syzbot

BUG: unable to handle page fault for address: fffffbfff46e6b93
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffe4067 P4D 23ffe4067 PUD 23ffe3067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 11884 Comm: syz.4.1876 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189
Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00
RSP: 0018:ffffc90004297800 EFLAGS: 00010086
RAX: 0000000001e89001 RBX: 1ffffffff46e6b93 RCX: ffffffff81709eb4
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffffa3735c98
RBP: ffffffffffffffff R08: ffffffffa3735c9f R09: 1ffffffff46e6b93
R10: dffffc0000000000 R11: fffffbfff46e6b93 R12: ffff88802859e4c4
R13: ffff88802859da00 R14: dffffc0000000001 R15: fffffbfff46e6b94
FS:  00005555952cb500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff46e6b93 CR3: 000000007dca8000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 __lock_acquire+0xc94/0x2100 kernel/locking/lockdep.c:5196
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
 _double_lock_balance kernel/sched/sched.h:2980 [inline]
 double_lock_balance kernel/sched/sched.h:3025 [inline]
 find_lock_lowest_rq+0x1e1/0x670 kernel/sched/rt.c:1914
 push_rt_task+0x144/0x790 kernel/sched/rt.c:2048
 push_rt_tasks kernel/sched/rt.c:2096 [inline]
 task_woken_rt+0x14c/0x220 kernel/sched/rt.c:2394
 ttwu_do_activate+0x30c/0x760 kernel/sched/core.c:3732
 ttwu_queue kernel/sched/core.c:3993 [inline]
 try_to_wake_up+0x89b/0x1470 kernel/sched/core.c:4321
 signal_wake_up_state+0xb4/0x120 kernel/signal.c:733
 signal_wake_up include/linux/sched/signal.h:445 [inline]
 zap_other_threads+0x2fd/0x3e0 kernel/signal.c:1351
 do_group_exit+0x18a/0x2c0 kernel/exit.c:1082
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096
 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ddb57e819
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:00007ffd43758048 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2ddb57e819
RDX: 00007f2dda3f9000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd4375809c R08: 00007ffd4375812f R09: 0000000000093e6d
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 0000000000093e6d R14: 0000000000093de7 R15: 00007ffd437580f0
 </TASK>
Modules linked in:
CR2: fffffbfff46e6b93
---[ end trace 0000000000000000 ]---
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189
Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00
RSP: 0018:ffffc90004297800 EFLAGS: 00010086
RAX: 0000000001e89001 RBX: 1ffffffff46e6b93 RCX: ffffffff81709eb4
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffffa3735c98
RBP: ffffffffffffffff R08: ffffffffa3735c9f R09: 1ffffffff46e6b93
R10: dffffc0000000000 R11: fffffbfff46e6b93 R12: ffff88802859e4c4
R13: ffff88802859da00 R14: dffffc0000000001 R15: fffffbfff46e6b94
FS:  00005555952cb500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff46e6b93 CR3: 000000007dca8000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 7 bytes skipped:
   0:	df 4f 8d             	fisttps -0x73(%rdi)
   3:	3c 31                	cmp    $0x31,%al
   5:	4c 89 fd             	mov    %r15,%rbp
   8:	4c 29 dd             	sub    %r11,%rbp
   b:	48 83 fd 10          	cmp    $0x10,%rbp
   f:	7f 29                	jg     0x3a
  11:	48 85 ed             	test   %rbp,%rbp
  14:	0f 84 3e 01 00 00    	je     0x158
  1a:	4c 89 cd             	mov    %r9,%rbp
  1d:	48 f7 d5             	not    %rbp
  20:	48 01 dd             	add    %rbx,%rbp
* 23:	41 80 3b 00          	cmpb   $0x0,(%r11) <-- trapping instruction
  27:	0f 85 c9 01 00 00    	jne    0x1f6
  2d:	49 ff c3             	inc    %r11
  30:	48 ff c5             	inc    %rbp
  33:	75 ee                	jne    0x23
  35:	e9                   	.byte 0xe9
  36:	1e                   	(bad)
  37:	01 00                	add    %eax,(%rax)