------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 0 PID: 19083 at kernel/locking/mutex.c:582 __mutex_lock_common+0x1468/0x1f3c kernel/locking/mutex.c:582 Modules linked in: CPU: 0 PID: 19083 Comm: syz.2.6561 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : __mutex_lock_common+0x1468/0x1f3c kernel/locking/mutex.c:582 lr : __mutex_lock_common+0x1468/0x1f3c kernel/locking/mutex.c:582 sp : ffff800025ea7800 x29: ffff800025ea7950 x28: ffff700004bd4f14 x27: 0000000000000000 x26: 0000000000000000 x25: 1fffe0001f5be387 x24: 0000000000000000 x23: dfff800000000000 x22: ffff800008d146f4 x21: ffff800025ea78c0 x20: 0000000000000000 x19: ffff0000de6bb028 x18: 1fffe00033e7277e x17: ffff80001537d000 x16: ffff800008043b30 x15: 0000000040000000 x14: 0000000000000001 x13: 1fffe00033e74e70 x12: 0000000000000000 x11: ff00800008048e14 x10: 0000000040000002 x9 : f2e9b7a93572fa00 x8 : f2e9b7a93572fa00 x7 : ffff800011cec160 x6 : ffff80000825ab4c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff800025ea73c0 x1 : 0000000000000000 x0 : ffff80000825abe0 Call trace: __mutex_lock_common+0x1468/0x1f3c 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+0x144/0x3c4 fs/reiserfs/namei.c:364 lookup_one_qstr_excl+0x108/0x230 fs/namei.c:1613 do_unlinkat+0x194/0x504 fs/namei.c:4382 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4434 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 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: 3917 hardirqs last enabled at (3917): [] mod_objcg_state+0x32c/0x4f0 mm/memcontrol.c:3217 hardirqs last disabled at (3916): [] mod_objcg_state+0x164/0x4f0 mm/memcontrol.c:3164 softirqs last enabled at (3904): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (3902): [] 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 366 is out of range for type 'unsigned long[8]' CPU: 0 PID: 19083 Comm: syz.2.6561 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: dump_backtrace+0x1c4/0x1f0 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+0x8a8/0xc14 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+0x38c/0x1f3c 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+0x144/0x3c4 fs/reiserfs/namei.c:364 lookup_one_qstr_excl+0x108/0x230 fs/namei.c:1613 do_unlinkat+0x194/0x504 fs/namei.c:4382 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4434 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 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 ffff8000152eb1b0 KASAN: probably user-memory-access in range [0x00000000a9758d80-0x00000000a9758d87] 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=000000020dd2e000 [ffff8000152eb1b0] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=100000023fff9003, pte=0000000000000000 Internal error: Oops: 0000000096000047 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 19083 Comm: syz.2.6561 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x598/0xc14 kernel/locking/qspinlock.c:474 lr : decode_tail kernel/locking/qspinlock.c:131 [inline] lr : queued_spin_lock_slowpath+0x8a8/0xc14 kernel/locking/qspinlock.c:471 sp : ffff800025ea7600 x29: ffff800025ea76a0 x28: 1fffe00033e75030 x27: ffff8000152eb1b0 x26: ffff00019f3a8188 x25: ffff800025ea7620 x24: 1fffe0001bcd7606 x23: dfff800000000000 x22: ffff700004bd4ec4 x21: ffff8000152eb1b0 x20: ffff00019f3a8180 x19: ffff0000de6bb030 x18: 1fffe00033e7277e x17: 3d3d3d3d3d3d3d3d x16: ffff800008195560 x15: 3d3d3d3d3d3d3d3d x14: ffff700002ff00bc x13: 1ffff00002ff00bc x12: 0000000000080000 x11: 0000000000027ef1 x10: ffff8000152eb180 x9 : 0000000000000003 x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800025ea7058 x4 : ffff800015464e80 x3 : ffff8000081955ac x2 : 0000000000000001 x1 : 0000000000000004 x0 : ffff00019f3a8188 Call trace: queued_spin_lock_slowpath+0x598/0xc14 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+0x38c/0x1f3c 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+0x144/0x3c4 fs/reiserfs/namei.c:364 lookup_one_qstr_excl+0x108/0x230 fs/namei.c:1613 do_unlinkat+0x194/0x504 fs/namei.c:4382 __do_sys_unlinkat fs/namei.c:4441 [inline] __se_sys_unlinkat fs/namei.c:4434 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4434 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 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 978df364 91002280 52800081 (f90002b4) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: aa1503e0 mov x0, x21 4: 978df364 bl 0xfffffffffe37cd94 8: 91002280 add x0, x20, #0x8 c: 52800081 mov w1, #0x4 // #4 * 10: f90002b4 str x20, [x21] <-- trapping instruction