================================================================== BUG: KASAN: stack-out-of-bounds in __lock_acquire+0x10c/0x7904 kernel/locking/lockdep.c:5089 Read of size 8 at addr ffff80009f577578 by task syz.4.312/7534 CPU: 1 UID: 0 PID: 7534 Comm: syz.4.312 Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #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: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+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 [ffff80009f570000, ffff80009f579000) created by: copy_process+0x490/0x3250 kernel/fork.c:2225 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10866f memcg:ffff0000c66a0102 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff0000c66a0102 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff80009f577400: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 ffff80009f577480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff80009f577500: 00 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 ^ ffff80009f577580: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffff80009f577600: 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 ffff700013a8827e KASAN: probably wild-memory-access in range [0xffff80009d4413f0-0xffff80009d4413f7] Mem abort info: ESR = 0x0000000096000007 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 = 0x00000007, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001a5699000 [ffff700013a8827e] pgd=0000000000000000, p4d=000000023ea68003, pud=000000023ea67003, pmd=10000001061a1403, pte=0000000000000000 Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP Modules linked in: CPU: 1 UID: 0 PID: 7534 Comm: syz.4.312 Tainted: G B 6.13.0-rc3-syzkaller-g573067a5a685 #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 : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline] pc : __lock_acquire+0x1040/0x7904 kernel/locking/lockdep.c:5196 lr : mark_usage kernel/locking/lockdep.c:4670 [inline] lr : __lock_acquire+0xff4/0x7904 kernel/locking/lockdep.c:5180 sp : ffff8000a41c6bc0 x29: ffff8000a41c6e80 x28: ffff0000c6ecdac0 x27: ffff0000c6ece5b0 x26: 1fffe00018dd9cb6 x25: ffff800092fff2ae x24: 0000000000000001 x23: ffff0000c6ece538 x22: ffff0000c6ece590 x21: ffff0001b38051cc x20: 0000000000000000 x19: ffff80009d4413f0 x18: 0000000000000008 x17: 0000000000000000 x16: ffff800083275834 x15: 0000000000000001 x14: 1ffff000125d8af0 x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000080000 x10: f5c28eb8512f61b0 x9 : ffff8000931e27c0 x8 : 1ffff00013a8827e x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000a41c61f8 x4 : ffff80008fa8f840 x3 : ffff80008046753c x2 : 0000000000000008 x1 : ffff0000c6ece590 x0 : 0000000000000001 Call trace: generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline] (P) __lock_acquire+0x1040/0x7904 kernel/locking/lockdep.c:5196 (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: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+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: d343fd08 927de508 8b080133 d343fe68 (386d6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d343fd08 lsr x8, x8, #3 4: 927de508 and x8, x8, #0x1ffffffffffffff8 8: 8b080133 add x19, x9, x8 c: d343fe68 lsr x8, x19, #3 * 10: 386d6908 ldrb w8, [x8, x13] <-- trapping instruction