------------[ cut here ]------------
RUST PANIC: CPU: 0 PID: 457 at /usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:218
==================================================================
BUG: KASAN: global-out-of-bounds in core::fmt::run usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:1531 [inline]
BUG: KASAN: global-out-of-bounds in core::fmt::write+0x62e/0xaa0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:1498
Read of size 4 at addr ffffffff8734c198 by task syz.2.16/457

CPU: 0 UID: 0 PID: 457 Comm: syz.2.16 Not tainted 6.12.23-syzkaller-08445-g72ccaf358b3b-dirty #0 fe30249007f871a59a121e0ae995cc07bf3813bd
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x7b/0x190 lib/dump_stack.c:120
 print_address_description+0x71/0x220 mm/kasan/report.c:377
 print_report+0x4a/0x70 mm/kasan/report.c:488
 kasan_report+0x163/0x1a0 mm/kasan/report.c:601
 __asan_report_load4_noabort+0x18/0x20 mm/kasan/report_generic.c:380
 core::fmt::run usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:1531 [inline]
 core::fmt::write+0x62e/0xaa0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:1498
 <&mut kernel::str::RawFormatter as core::fmt::Write::write_fmt::SpecWriteFmt>::spec_write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:229 [inline]
 <kernel::str::RawFormatter as core::fmt::Write>::write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:234 [inline]
 rust_fmt_argument+0x107/0x1a0 rust/kernel/print.rs:27
 pointer+0x74e/0xdd0 lib/vsprintf.c:2467
 vsnprintf+0xc7b/0x1aa0 lib/vsprintf.c:2807
 vscnprintf+0x45/0x90 lib/vsprintf.c:2909
 panic+0x193/0x700 kernel/panic.c:342
 rust_panic+0xc0/0xf0 kernel/panic.c:817
 __rustc::rust_begin_unwind+0x175/0x1c0 rust/kernel/lib.rs:139
 core::panicking::panic_nounwind_fmt::runtime usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:117 [inline]
 core::panicking::panic_nounwind_fmt+0xec/0xf0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics/mod.rs:3241
 core::panicking::panic_nounwind+0xa7/0xb0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:218
 core::fmt::write+0xa87/0xaa0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:-1
 <&mut kernel::str::RawFormatter as core::fmt::Write::write_fmt::SpecWriteFmt>::spec_write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:229 [inline]
 <kernel::str::RawFormatter as core::fmt::Write>::write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:234 [inline]
 rust_fmt_argument+0x107/0x1a0 rust/kernel/print.rs:27
 pointer+0x74e/0xdd0 lib/vsprintf.c:2467
 vsnprintf+0xc7b/0x1aa0 lib/vsprintf.c:2807
 vscnprintf+0x45/0x90 lib/vsprintf.c:2909
 panic+0x193/0x700 kernel/panic.c:342
 rust_panic+0xc0/0xf0 kernel/panic.c:817
 __rustc::rust_begin_unwind+0x175/0x1c0 rust/kernel/lib.rs:139
 core::panicking::panic_fmt+0x84/0x90 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:75
 core::panicking::panic_const::panic_const_sub_overflow+0xb2/0xc0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:178
 <rust_binder::node::NodeRef>::update drivers/android/binder/node.rs:877 [inline]
 <rust_binder::process::Process>::update_ref+0x17e5/0x1860 drivers/android/binder/process.rs:913
 <rust_binder::thread::Thread>::write drivers/android/binder/thread.rs:1470 [inline]
 <rust_binder::thread::Thread>::write_read+0x278d/0x9d20 drivers/android/binder/thread.rs:1581
 <rust_binder::process::Process>::ioctl_write_read drivers/android/binder/process.rs:1535 [inline]
 <rust_binder::process::Process>::ioctl+0x411/0x2c20 drivers/android/binder/process.rs:1596
 rust_binder::rust_binder_unlocked_ioctl+0xa0/0x100 drivers/android/binder/rust_binder.rs:445
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x132/0x1b0 fs/ioctl.c:893
 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f76b178e929
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:00007f76b2655038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f76b19b5fa0 RCX: 00007f76b178e929
RDX: 0000200000000480 RSI: 00000000c0306201 RDI: 0000000000000004
RBP: 00007f76b1810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f76b19b5fa0 R15: 00007fffe3131af8
 </TASK>

The buggy address belongs to the variable:
 printk_rb_static+0x58/0x80

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x734c
flags: 0x4000(reserved|zone=0)
raw: 0000000000004000 ffffea00001cd308 ffffea00001cd308 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff8734c080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffffff8734c100: f9 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
>ffffffff8734c180: 00 00 00 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
                            ^
 ffffffff8734c200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff8734c280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: ffffc900010bd490
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0011) - permissions violation
PGD 100000067 P4D 100000067 PUD 101656067 PMD 11dd96067 PTE 8000000115aca063
Oops: Oops: 0011 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 457 Comm: syz.2.16 Tainted: G    B              6.12.23-syzkaller-08445-g72ccaf358b3b-dirty #0 fe30249007f871a59a121e0ae995cc07bf3813bd
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:0xffffc900010bd490
Code: ff ff e8 d6 0b 01 00 c9 ff ff d4 7a 21 00 20 f9 ff 1f 00 00 00 00 00 fc ff df f6 94 ed 86 ff ff ff ff 10 d7 0b 01 00 c9 ff ff <50> d5 0b 01 00 c9 ff ff 07 4f 06 81 ff ff ff ff 20 ac 97 88 ff ff
RSP: 0018:ffffc900010bcd18 EFLAGS: 00010046
RAX: 1ffff92000217a8b RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffc900010bcdc0 RDI: ffffffff8155c7a4
RBP: ffffc900010bce50 R08: ffffffff88954947 R09: 1ffffffff112a928
R10: dffffc0000000000 R11: ffffc900010bd490 R12: ffffffff8155c7a4
R13: 0000000000000000 R14: ffffc900010bd458 R15: 0000000000000000
FS:  00007f76b26556c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900010bd490 CR3: 000000011c054000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 <&mut kernel::str::RawFormatter as core::fmt::Write::write_fmt::SpecWriteFmt>::spec_write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:229 [inline]
 <kernel::str::RawFormatter as core::fmt::Write>::write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:234 [inline]
 rust_fmt_argument+0x107/0x1a0 rust/kernel/print.rs:27
 pointer+0x74e/0xdd0 lib/vsprintf.c:2467
 vsnprintf+0xc7b/0x1aa0 lib/vsprintf.c:2807
 vscnprintf+0x45/0x90 lib/vsprintf.c:2909
 panic+0x193/0x700 kernel/panic.c:342
 rust_panic+0xc0/0xf0 kernel/panic.c:817
 __rustc::rust_begin_unwind+0x175/0x1c0 rust/kernel/lib.rs:139
 core::panicking::panic_nounwind_fmt::runtime usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:117 [inline]
 core::panicking::panic_nounwind_fmt+0xec/0xf0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics/mod.rs:3241
 core::panicking::panic_nounwind+0xa7/0xb0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:218
 core::fmt::write+0xa87/0xaa0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:-1
 <&mut kernel::str::RawFormatter as core::fmt::Write::write_fmt::SpecWriteFmt>::spec_write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:229 [inline]
 <kernel::str::RawFormatter as core::fmt::Write>::write_fmt usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:234 [inline]
 rust_fmt_argument+0x107/0x1a0 rust/kernel/print.rs:27
 pointer+0x74e/0xdd0 lib/vsprintf.c:2467
 vsnprintf+0xc7b/0x1aa0 lib/vsprintf.c:2807
 vscnprintf+0x45/0x90 lib/vsprintf.c:2909
 panic+0x193/0x700 kernel/panic.c:342
 rust_panic+0xc0/0xf0 kernel/panic.c:817
 __rustc::rust_begin_unwind+0x175/0x1c0 rust/kernel/lib.rs:139
 core::panicking::panic_fmt+0x84/0x90 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:75
 core::panicking::panic_const::panic_const_sub_overflow+0xb2/0xc0 usr/local/rustup/toolchains/1.87.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:178
 <rust_binder::node::NodeRef>::update drivers/android/binder/node.rs:877 [inline]
 <rust_binder::process::Process>::update_ref+0x17e5/0x1860 drivers/android/binder/process.rs:913
 <rust_binder::thread::Thread>::write drivers/android/binder/thread.rs:1470 [inline]
 <rust_binder::thread::Thread>::write_read+0x278d/0x9d20 drivers/android/binder/thread.rs:1581
 <rust_binder::process::Process>::ioctl_write_read drivers/android/binder/process.rs:1535 [inline]
 <rust_binder::process::Process>::ioctl+0x411/0x2c20 drivers/android/binder/process.rs:1596
 rust_binder::rust_binder_unlocked_ioctl+0xa0/0x100 drivers/android/binder/rust_binder.rs:445
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x132/0x1b0 fs/ioctl.c:893
 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f76b178e929
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:00007f76b2655038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f76b19b5fa0 RCX: 00007f76b178e929
RDX: 0000200000000480 RSI: 00000000c0306201 RDI: 0000000000000004
RBP: 00007f76b1810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f76b19b5fa0 R15: 00007fffe3131af8
 </TASK>
Modules linked in:
CR2: ffffc900010bd490
---[ end trace 0000000000000000 ]---
RIP: 0010:0xffffc900010bd490
Code: ff ff e8 d6 0b 01 00 c9 ff ff d4 7a 21 00 20 f9 ff 1f 00 00 00 00 00 fc ff df f6 94 ed 86 ff ff ff ff 10 d7 0b 01 00 c9 ff ff <50> d5 0b 01 00 c9 ff ff 07 4f 06 81 ff ff ff ff 20 ac 97 88 ff ff
RSP: 0018:ffffc900010bcd18 EFLAGS: 00010046
RAX: 1ffff92000217a8b RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffc900010bcdc0 RDI: ffffffff8155c7a4
RBP: ffffc900010bce50 R08: ffffffff88954947 R09: 1ffffffff112a928
R10: dffffc0000000000 R11: ffffc900010bd490 R12: ffffffff8155c7a4
R13: 0000000000000000 R14: ffffc900010bd458 R15: 0000000000000000
FS:  00007f76b26556c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900010bd490 CR3: 000000011c054000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400