================================================================== BUG: KASAN: stack-out-of-bounds in __lock_acquire+0x114/0x764c kernel/locking/lockdep.c:4926 Read of size 8 at addr ffff8000258b7618 by task syz-executor.3/14748 CPU: 0 PID: 14748 Comm: syz-executor.3 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:319 [inline] print_report+0x174/0x514 mm/kasan/report.c:430 kasan_report+0xd4/0x130 mm/kasan/report.c:536 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __lock_acquire+0x114/0x764c kernel/locking/lockdep.c:4926 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 __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+0x178/0x624 fs/xfs/xfs_buf.c:1120 xfs_buf_delwri_submit_buffers+0x12c/0x87c fs/xfs/xfs_buf.c:2165 xfs_buf_delwri_submit+0xbc/0x244 fs/xfs/xfs_buf.c:2243 xfs_qm_shrink_scan+0x17c/0x35c fs/xfs/xfs_qm.c:522 do_shrink_slab+0x4b0/0x1060 mm/vmscan.c:853 shrink_slab+0x1e0/0x7f0 mm/vmscan.c:1013 drop_slab_node mm/vmscan.c:1041 [inline] drop_slab+0x124/0x26c mm/vmscan.c:1059 drop_caches_sysctl_handler+0x178/0x394 fs/drop_caches.c:66 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:604 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:630 do_iter_write+0x534/0x964 fs/read_write.c:861 vfs_iter_write+0x88/0xac fs/read_write.c:902 iter_file_splice_write+0x610/0xc40 fs/splice.c:778 do_splice_from fs/splice.c:856 [inline] direct_splice_actor+0xe4/0x1c0 fs/splice.c:1022 splice_direct_to_actor+0x3c4/0x944 fs/splice.c:977 do_splice_direct+0x1f4/0x334 fs/splice.c:1065 do_sendfile+0x4bc/0xc70 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1309 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the virtual mapping at [ffff8000258b0000, ffff8000258b9000) created by: copy_process+0x4b8/0x3808 kernel/fork.c:2098 The buggy address belongs to the physical page: page:00000000f52d9f14 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ed93 memcg:ffff0000d70c0c02 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff0000d70c0c02 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8000258b7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8000258b7580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8000258b7600: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ^ ffff8000258b7680: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffff8000258b7700: 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Unable to handle kernel paging request at virtual address dfff800000000017 KASAN: null-ptr-deref in range [0x00000000000000b8-0x00000000000000bf] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000017] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 14748 Comm: syz-executor.3 Tainted: G B 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4730 [inline] pc : __lock_acquire+0x544/0x764c kernel/locking/lockdep.c:5006 lr : hlock_class kernel/locking/lockdep.c:232 [inline] lr : check_wait_context kernel/locking/lockdep.c:4730 [inline] lr : __lock_acquire+0x720/0x764c kernel/locking/lockdep.c:5006 sp : ffff800025bd67c0 x29: ffff800025bd6a60 x28: ffff0000d74c2508 x27: ffff0000d74c1b40 x26: ffff0000d74c2580 x25: 0000000000000002 x24: 1fffe0001ae984b0 x23: ffff0000d74c2560 x22: 0000000000001759 x21: 0000000000000000 x20: ffff800018cfa908 x19: 00000000000000b8 x18: ffff800025bd5e20 x17: 0000000000000000 x16: ffff8000123165a4 x15: 0000000000000002 x14: 0000000000000000 x13: 0000000000000001 x12: dfff800000000000 x11: 0000000000040000 x10: 000000000003faaa x9 : ffff8000288c9000 x8 : 0000000000000017 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800025bd5fd8 x4 : ffff800015d5c8c0 x3 : ffff8000083063b8 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4730 [inline] __lock_acquire+0x544/0x764c kernel/locking/lockdep.c:5006 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 __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+0x178/0x624 fs/xfs/xfs_buf.c:1120 xfs_buf_delwri_submit_buffers+0x12c/0x87c fs/xfs/xfs_buf.c:2165 xfs_buf_delwri_submit+0xbc/0x244 fs/xfs/xfs_buf.c:2243 xfs_qm_shrink_scan+0x17c/0x35c fs/xfs/xfs_qm.c:522 do_shrink_slab+0x4b0/0x1060 mm/vmscan.c:853 shrink_slab+0x1e0/0x7f0 mm/vmscan.c:1013 drop_slab_node mm/vmscan.c:1041 [inline] drop_slab+0x124/0x26c mm/vmscan.c:1059 drop_caches_sysctl_handler+0x178/0x394 fs/drop_caches.c:66 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:604 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:630 do_iter_write+0x534/0x964 fs/read_write.c:861 vfs_iter_write+0x88/0xac fs/read_write.c:902 iter_file_splice_write+0x610/0xc40 fs/splice.c:778 do_splice_from fs/splice.c:856 [inline] direct_splice_actor+0xe4/0x1c0 fs/splice.c:1022 splice_direct_to_actor+0x3c4/0x944 fs/splice.c:977 do_splice_direct+0x1f4/0x334 fs/splice.c:1065 do_sendfile+0x4bc/0xc70 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1309 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Code: 34000f48 aa1f03e8 9102e113 d343fe68 (38ec6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000f48 cbz w8, 0x1e8 4: aa1f03e8 mov x8, xzr 8: 9102e113 add x19, x8, #0xb8 c: d343fe68 lsr x8, x19, #3 * 10: 38ec6908 ldrsb w8, [x8, x12] <-- trapping instruction