================================================================== BUG: KASAN: stack-out-of-bounds in __lock_acquire+0x10c/0x7904 kernel/locking/lockdep.c:5089 Read of size 8 at addr ffff80009ea07578 by task syz.4.252/7706 CPU: 0 UID: 0 PID: 7706 Comm: syz.4.252 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #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:466 (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:378 [inline] print_report+0x198/0x538 mm/kasan/report.c:489 kasan_report+0xd8/0x138 mm/kasan/report.c:602 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __lock_acquire+0x10c/0x7904 kernel/locking/lockdep.c:5089 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 __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+0x180/0x63c fs/xfs/xfs_buf.c:1196 xfs_buf_delwri_submit_buffers+0x12c/0x8b4 fs/xfs/xfs_buf.c:2298 xfs_buf_delwri_submit+0xbc/0x24c fs/xfs/xfs_buf.c:2376 xfs_qm_shrink_scan+0x198/0x378 fs/xfs/xfs_qm.c:577 do_shrink_slab+0x62c/0x124c mm/shrinker.c:437 shrink_slab+0xe9c/0x124c mm/shrinker.c:664 drop_slab_node mm/vmscan.c:421 [inline] drop_slab+0x124/0x26c mm/vmscan.c:439 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68 proc_sys_call_handler+0x64c/0x918 fs/proc/proc_sysctl.c:601 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:627 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1050 do_writev+0x178/0x304 fs/read_write.c:1096 __do_sys_writev fs/read_write.c:1164 [inline] __se_sys_writev fs/read_write.c:1161 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1161 __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 [ffff80009ea00000, ffff80009ea09000) created by: copy_process+0x490/0x3250 kernel/fork.c:2224 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x129214 memcg:ffff0000c611cb82 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff0000c611cb82 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff80009ea07400: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 ffff80009ea07480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff80009ea07500: 00 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 ^ ffff80009ea07580: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffff80009ea07600: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 f3 f3 ================================================================== Unable to handle kernel paging request at virtual address dfff800000000018 KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000018] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 7706 Comm: syz.4.252 Tainted: G B 6.13.0-rc7-syzkaller-g1950a0af2d55 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4850 [inline] pc : __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5176 lr : hlock_class kernel/locking/lockdep.c:232 [inline] lr : check_wait_context kernel/locking/lockdep.c:4850 [inline] lr : __lock_acquire+0x75c/0x7904 kernel/locking/lockdep.c:5176 sp : ffff80009e906bc0 x29: ffff80009e906e80 x28: ffff0000d71a5ac0 x27: ffff0000d71a65b0 x26: 1fffe0001ae34cb6 x25: 0000000000000000 x24: 0000000000000001 x23: ffff0000d71a6538 x22: ffff0000d71a6590 x21: 00000000000000c4 x20: 00000000000015b0 x19: ffff8000931d8a70 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008327a354 x15: 0000000000000001 x14: 1ffff000125d76f0 x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000018 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009e9061f8 x4 : ffff80008fa90460 x3 : ffff800080467edc x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4850 [inline] (P) __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5176 (P) lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 __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+0x180/0x63c fs/xfs/xfs_buf.c:1196 xfs_buf_delwri_submit_buffers+0x12c/0x8b4 fs/xfs/xfs_buf.c:2298 xfs_buf_delwri_submit+0xbc/0x24c fs/xfs/xfs_buf.c:2376 xfs_qm_shrink_scan+0x198/0x378 fs/xfs/xfs_qm.c:577 do_shrink_slab+0x62c/0x124c mm/shrinker.c:437 shrink_slab+0xe9c/0x124c mm/shrinker.c:664 drop_slab_node mm/vmscan.c:421 [inline] drop_slab+0x124/0x26c mm/vmscan.c:439 drop_caches_sysctl_handler+0x17c/0x398 fs/drop_caches.c:68 proc_sys_call_handler+0x64c/0x918 fs/proc/proc_sysctl.c:601 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:627 do_iter_readv_writev+0x490/0x6d4 vfs_writev+0x410/0xbc8 fs/read_write.c:1050 do_writev+0x178/0x304 fs/read_write.c:1096 __do_sys_writev fs/read_write.c:1164 [inline] __se_sys_writev fs/read_write.c:1161 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1161 __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: 34000fa8 aa1f03e8 91031115 d343fea8 (38ed6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000fa8 cbz w8, 0x1f4 4: aa1f03e8 mov x8, xzr 8: 91031115 add x21, x8, #0xc4 c: d343fea8 lsr x8, x21, #3 * 10: 38ed6908 ldrsb w8, [x8, x13] <-- trapping instruction