================================================================== BUG: KASAN: stack-out-of-bounds in __lock_acquire+0x10c/0x77c8 kernel/locking/lockdep.c:5065 Read of size 8 at addr ffff80009eaf7598 by task syz.3.195/7607 CPU: 0 UID: 0 PID: 7607 Comm: syz.3.195 Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __lock_acquire+0x10c/0x77c8 kernel/locking/lockdep.c:5065 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 down+0x3c/0xe8 kernel/locking/semaphore.c:59 xfs_buf_lock+0x178/0x654 fs/xfs/xfs_buf.c:1196 xfs_buf_delwri_submit_buffers+0x134/0x8ac fs/xfs/xfs_buf.c:2293 xfs_buf_delwri_submit+0xbc/0x24c fs/xfs/xfs_buf.c:2371 xfs_qm_shrink_scan+0x198/0x378 fs/xfs/xfs_qm.c:522 do_shrink_slab+0x648/0x1274 mm/shrinker.c:437 shrink_slab+0xe9c/0x124c mm/shrinker.c:664 drop_slab_node mm/vmscan.c:414 [inline] drop_slab+0x124/0x26c mm/vmscan.c:432 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1064 do_writev+0x178/0x304 fs/read_write.c:1111 __do_sys_writev fs/read_write.c:1184 [inline] __se_sys_writev fs/read_write.c:1181 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1181 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the virtual mapping at [ffff80009eaf0000, ffff80009eaf9000) created by: copy_process+0x490/0x3250 kernel/fork.c:2204 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x4 pfn:0x1309f1 memcg:ffff0000c1d9e602 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000004 0000000000000000 00000001ffffffff ffff0000c1d9e602 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff80009eaf7480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff80009eaf7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff80009eaf7580: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ^ ffff80009eaf7600: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffff80009eaf7680: 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.c:131:9 index 10154 is out of range for type 'unsigned long[8]' CPU: 0 UID: 0 PID: 7607 Comm: syz.3.195 Tainted: G B 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf8/0x148 lib/ubsan.c:429 decode_tail kernel/locking/qspinlock.c:131 [inline] queued_spin_lock_slowpath+0x974/0xd00 kernel/locking/qspinlock.c:468 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2ec/0x334 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x64/0x7c kernel/locking/spinlock.c:162 down+0x3c/0xe8 kernel/locking/semaphore.c:59 xfs_buf_lock+0x178/0x654 fs/xfs/xfs_buf.c:1196 xfs_buf_delwri_submit_buffers+0x134/0x8ac fs/xfs/xfs_buf.c:2293 xfs_buf_delwri_submit+0xbc/0x24c fs/xfs/xfs_buf.c:2371 xfs_qm_shrink_scan+0x198/0x378 fs/xfs/xfs_qm.c:522 do_shrink_slab+0x648/0x1274 mm/shrinker.c:437 shrink_slab+0xe9c/0x124c mm/shrinker.c:664 drop_slab_node mm/vmscan.c:414 [inline] drop_slab+0x124/0x26c mm/vmscan.c:432 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1064 do_writev+0x178/0x304 fs/read_write.c:1111 __do_sys_writev fs/read_write.c:1184 [inline] __se_sys_writev fs/read_write.c:1181 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1181 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 ---[ end trace ]--- Unable to handle kernel paging request at virtual address ffff80008f835830 KASAN: probably user-memory-access in range [0x000000047c1ac180-0x000000047c1ac187] 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, ISS2 = 0x00000000 CM = 0, WnR = 1, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001a57d1000 [ffff80008f835830] pgd=0000000000000000, p4d=10000001adc7a003, pud=10000001adc7b003, pmd=10000001adc80003, pte=0000000000000000 Internal error: Oops: 0000000096000047 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 7607 Comm: syz.3.195 Tainted: G B 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x3cc/0xd00 kernel/locking/qspinlock.c:471 lr : decode_tail kernel/locking/qspinlock.c:131 [inline] lr : queued_spin_lock_slowpath+0x974/0xd00 kernel/locking/qspinlock.c:468 sp : ffff80009eae6ea0 x29: ffff80009eae6f40 x28: 0000000000009eaf x27: 1ffff00013d5cde0 x26: dfff800000000000 x25: 1ffff00013d5eeb0 x24: 0000000000040000 x23: ffff0001b3632808 x22: ffff80008f835830 x21: ffff0001b3632800 x20: 1fffe000366c6500 x19: ffff80009eaf7580 x18: 0000000000000008 x17: 0000000000000000 x16: ffff8000831615b0 x15: ffff7000125bc240 x14: 1ffff000125bc240 x13: 0000000000000004 x12: ffffffffffffffff x11: 0000000000080000 x10: ffff80008f835800 x9 : 0000000000000003 x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009eae6598 x4 : ffff80008f9bd220 x3 : ffff8000801ea08c x2 : 0000000000000001 x1 : 0000000000000004 x0 : ffff0001b3632808 Call trace: queued_spin_lock_slowpath+0x3cc/0xd00 kernel/locking/qspinlock.c:474 (P) decode_tail kernel/locking/qspinlock.c:131 [inline] (L) queued_spin_lock_slowpath+0x974/0xd00 kernel/locking/qspinlock.c:468 (L) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2ec/0x334 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x64/0x7c kernel/locking/spinlock.c:162 down+0x3c/0xe8 kernel/locking/semaphore.c:59 xfs_buf_lock+0x178/0x654 fs/xfs/xfs_buf.c:1196 xfs_buf_delwri_submit_buffers+0x134/0x8ac fs/xfs/xfs_buf.c:2293 xfs_buf_delwri_submit+0xbc/0x24c fs/xfs/xfs_buf.c:2371 xfs_qm_shrink_scan+0x198/0x378 fs/xfs/xfs_qm.c:522 do_shrink_slab+0x648/0x1274 mm/shrinker.c:437 shrink_slab+0xe9c/0x124c mm/shrinker.c:664 drop_slab_node mm/vmscan.c:414 [inline] drop_slab+0x124/0x26c mm/vmscan.c:432 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1064 do_writev+0x178/0x304 fs/read_write.c:1111 __do_sys_writev fs/read_write.c:1184 [inline] __se_sys_writev fs/read_write.c:1181 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1181 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: aa1603e0 9722f4d7 aa1703e0 52800081 (f90002d5) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: aa1603e0 mov x0, x22 4: 9722f4d7 bl 0xfffffffffc8bd360 8: aa1703e0 mov x0, x23 c: 52800081 mov w1, #0x4 // #4 * 10: f90002d5 str x21, [x22] <-- trapping instruction