Code: e1 07 80 c1 03 38 c1 0f 8c 97 fe ff ff 4c 89 f7 e8 65 38 81 00 e9 8a fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0018:ffffc9000469f5d8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920008d3ec4 RCX: ffffffff94f2f903 RDX: 0000777d5931ae01 RSI: ffffffff8c0ae240 RDI: ffffffff8c607c40 ================================================================== BUG: KASAN: stack-out-of-bounds in __show_regs+0x172/0x610 arch/x86/kernel/process_64.c:87 Read of size 8 at addr ffffc9000469f548 by task syz-executor/7227 CPU: 0 UID: 0 PID: 7227 Comm: syz-executor Not tainted 6.11.0-rc1-next-20240729-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __show_regs+0x172/0x610 arch/x86/kernel/process_64.c:87 show_trace_log_lvl+0x3d4/0x520 arch/x86/kernel/dumpstack.c:301 sched_show_task+0x506/0x6d0 kernel/sched/core.c:7512 report_rtnl_holders+0x327/0x400 net/core/rtnetlink.c:110 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 8a 24 ac f5 48 89 df e8 02 68 ad f5 e8 4d cb d7 f5 fb bf 01 00 00 00 62 2f 9f f5 65 8b 05 a3 25 40 74 85 c0 74 06 5b c3 cc cc cc cc RSP: 0018:ffffc900093176d8 EFLAGS: 00000286 RAX: 4d683367c6fdea00 RBX: ffff8880606210b8 RCX: ffffffff817022ea RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: 0000000000000001 RBP: 1ffff1100c0c4216 R08: ffffffff93737817 R09: 1ffffffff26e6f02 R10: dffffc0000000000 R11: fffffbfff26e6f03 R12: 0000000000000007 R13: ffffc90009317858 R14: ffffea0001bcb1c0 R15: ffff8880606210b0 spin_unlock_irq include/linux/spinlock.h:401 [inline] filemap_remove_folio+0x110/0x2e0 mm/filemap.c:265 truncate_inode_folio+0x5d/0x70 mm/truncate.c:178 shmem_undo_range+0x45d/0x1df0 mm/shmem.c:1019 shmem_truncate_range mm/shmem.c:1132 [inline] shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1260 evict+0x2a8/0x630 fs/inode.c:669 __dentry_kill+0x20d/0x630 fs/dcache.c:610 dput+0x19f/0x2b0 fs/dcache.c:852 __fput+0x5f8/0x8a0 fs/file_table.c:430 task_work_run+0x24f/0x310 kernel/task_work.c:222 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f948a97604a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 13 8b 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 73 8b 02 00 8b 44 24 RSP: 002b:00007ffd1c190400 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f948a97604a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ffd1c19044c R08: 0000000000000000 R09: 00007ffd1c190167 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 0000000000077982 R14: 0000000000077247 R15: 00007ffd1c1904a0 The buggy address belongs to the virtual mapping at [ffffc90004698000, ffffc900046a1000) created by: copy_process+0x5d1/0x3d90 kernel/fork.c:2206 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21608 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 1114, tgid 1114 (kworker/u8:6), ts 7976504193, free_ts 7971473586 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3442 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4700 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263 vm_area_alloc_pages mm/vmalloc.c:3584 [inline] __vmalloc_area_node mm/vmalloc.c:3660 [inline] __vmalloc_node_range_noprof+0x971/0x1460 mm/vmalloc.c:3841 alloc_thread_stack_node kernel/fork.c:314 [inline] dup_task_struct+0x444/0x8c0 kernel/fork.c:1115 copy_process+0x5d1/0x3d90 kernel/fork.c:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2788 user_mode_thread+0x132/0x1a0 kernel/fork.c:2866 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:172 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page last free pid 51 tgid 51 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612 vfree+0x186/0x2e0 mm/vmalloc.c:3364 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3285 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffffc9000469f400: f2 f2 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 00 ffffc9000469f480: 00 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 >ffffc9000469f500: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 f3 f3 f3 ^ ffffc9000469f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000469f600: f1 f1 f1 f1 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: e1 07 loope 0x9 2: 80 c1 03 add $0x3,%cl 5: 38 c1 cmp %al,%cl 7: 0f 8c 97 fe ff ff jl 0xfffffea4 d: 4c 89 f7 mov %r14,%rdi 10: e8 65 38 81 00 call 0x81387a 15: e9 8a fe ff ff jmp 0xfffffea4 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop 29: 90 nop * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 55 push %rbp 2f: 48 89 e5 mov %rsp,%rbp 32: 41 57 push %r15 34: 41 56 push %r14 36: 41 55 push %r13 38: 41 54 push %r12 3a: 53 push %rbx 3b: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp 3f: 48 rex.W