------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 1 PID: 23545 at kernel/locking/mutex.c:582 __mutex_lock_common+0x146c/0x1f60 kernel/locking/mutex.c:582 Modules linked in: CPU: 1 PID: 23545 Comm: syz.2.8551 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : __mutex_lock_common+0x146c/0x1f60 kernel/locking/mutex.c:582 lr : __mutex_lock_common+0x146c/0x1f60 kernel/locking/mutex.c:582 sp : ffff800021077740 x29: ffff8000210778b0 x28: 1ffff0000388210c x27: ffff80001c410000 x26: dfff800000000000 x25: ffff70000420ef00 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000000 x21: ffff800021077820 x20: 0000000000000000 x19: ffff0000d639e028 x18: ffff800011b8bf60 x17: 1fffe00033eac97e x16: ffff80000804309c x15: ffff80001520d000 x14: 0000000000000001 x13: 1fffe0001b576010 x12: 0000000000000000 x11: 0000000000000000 x10: ffff60001b576011 x9 : c2c92276d93a1500 x8 : c2c92276d93a1500 x7 : 0000000000000004 x6 : ffff80000825796c x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008246798 x2 : 0000000000000001 x1 : 0000000000000004 x0 : 0000000000000001 Call trace: __mutex_lock_common+0x146c/0x1f60 kernel/locking/mutex.c:582 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_lookup+0x150/0x3e0 fs/reiserfs/namei.c:364 lookup_one_qstr_excl+0x108/0x230 fs/namei.c:1613 filename_create+0x1d0/0x3a8 fs/namei.c:3885 do_mkdirat+0xac/0x3ec fs/namei.c:4129 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 1793 hardirqs last enabled at (1793): [] mod_objcg_state+0x338/0x4fc mm/memcontrol.c:3217 hardirqs last disabled at (1792): [] mod_objcg_state+0x164/0x4fc mm/memcontrol.c:3164 softirqs last enabled at (1776): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1774): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ================================================================================ UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.c:131:9 index 16237 is out of range for type 'unsigned long[8]' CPU: 1 PID: 23545 Comm: syz.2.8551 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 ubsan_epilogue+0x14/0x48 lib/ubsan.c:151 __ubsan_handle_out_of_bounds+0xd0/0xf8 lib/ubsan.c:282 decode_tail kernel/locking/qspinlock.c:131 [inline] queued_spin_lock_slowpath+0x8a8/0xc18 kernel/locking/qspinlock.c:471 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2f4/0x2f8 kernel/locking/spinlock_debug.c:115 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline] _raw_spin_lock+0x5c/0x6c kernel/locking/spinlock.c:154 __mutex_lock_common+0x370/0x1f60 kernel/locking/mutex.c:617 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_lookup+0x150/0x3e0 fs/reiserfs/namei.c:364 lookup_one_qstr_excl+0x108/0x230 fs/namei.c:1613 filename_create+0x1d0/0x3a8 fs/namei.c:3885 do_mkdirat+0xac/0x3ec fs/namei.c:4129 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 ================================================================================ Unable to handle kernel paging request at virtual address ffff800015179f90 KASAN: probably user-memory-access in range [0x00000000a8bcfc80-0x00000000a8bcfc87] Mem abort info: ESR = 0x0000000096000047 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x07: level 3 translation fault Data abort info: ISV = 0, ISS = 0x00000047 CM = 0, WnR = 1 swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000020dfba000 [ffff800015179f90] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=100000023fffa003, pte=0000000000000000 Internal error: Oops: 0000000096000047 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 23545 Comm: syz.2.8551 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x598/0xc18 kernel/locking/qspinlock.c:474 lr : decode_tail kernel/locking/qspinlock.c:131 [inline] lr : queued_spin_lock_slowpath+0x8a8/0xc18 kernel/locking/qspinlock.c:471 sp : ffff800021077540 x29: ffff8000210775e0 x28: ffff800015179f90 x27: 1fffe0001ac73c06 x26: ffff800015210f40 x25: 1fffe00033eaf1f0 x24: dfff800000000000 x23: ffff70000420eeac x22: ffff00019f578f88 x21: ffff800015179f90 x20: ffff00019f578f80 x19: ffff0000d639e030 x18: ffff800011b8bf60 x17: 3d3d3d3d3d3d3d3d x16: ffff800008193830 x15: 0000000000000002 x14: ffff700002fbf8bc x13: 1ffff00002fbf8bc x12: 0000000000080000 x11: 00000000000288fe x10: ffff800015179f80 x9 : 0000000000000001 x8 : 0000000000000000 x7 : fffffffffffc4ad0 x6 : fffffffffffc4a98 x5 : ffff800021076f98 x4 : ffff8000152c67a8 x3 : ffff80000819387c x2 : 0000000000000001 x1 : 0000000000000004 x0 : ffff00019f578f88 Call trace: queued_spin_lock_slowpath+0x598/0xc18 kernel/locking/qspinlock.c:477 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2f4/0x2f8 kernel/locking/spinlock_debug.c:115 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline] _raw_spin_lock+0x5c/0x6c kernel/locking/spinlock.c:154 __mutex_lock_common+0x370/0x1f60 kernel/locking/mutex.c:617 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_lookup+0x150/0x3e0 fs/reiserfs/namei.c:364 lookup_one_qstr_excl+0x108/0x230 fs/namei.c:1613 filename_create+0x1d0/0x3a8 fs/namei.c:3885 do_mkdirat+0xac/0x3ec fs/namei.c:4129 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: aa1503e0 9793705a aa1603e0 52800081 (f90002b4) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: aa1503e0 mov x0, x21 4: 9793705a bl 0xfffffffffe4dc16c 8: aa1603e0 mov x0, x22 c: 52800081 mov w1, #0x4 // #4 * 10: f90002b4 str x20, [x21] <-- trapping instruction