================================================================== BUG: KASAN: stack-out-of-bounds in profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42 Read of size 8 at addr ffff8881ee7a7ba0 by task kworker/u4:3/438 CPU: 0 PID: 438 Comm: kworker/u4:3 Not tainted 5.4.276-syzkaller-00020-g4275fce9fe94 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42 profile_tick+0xb9/0x100 kernel/profile.c:416 tick_sched_handle kernel/time/tick-sched.c:206 [inline] tick_sched_timer+0x237/0x3c0 kernel/time/tick-sched.c:1342 __run_hrtimer kernel/time/hrtimer.c:1581 [inline] __hrtimer_run_queues+0x3e9/0xb90 kernel/time/hrtimer.c:1643 hrtimer_interrupt+0x38a/0x890 kernel/time/hrtimer.c:1705 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1122 [inline] smp_apic_timer_interrupt+0x110/0x460 arch/x86/kernel/apic/apic.c:1147 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:200 [inline] RIP: 0010:atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:695 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:78 [inline] RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:181 [inline] RIP: 0010:__raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] RIP: 0010:_raw_spin_lock_bh+0x166/0x1b0 kernel/locking/spinlock.c:175 Code: 85 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 34 ff ff ff 4c 89 ff e8 fa 02 43 fd e9 27 ff ff ff 48 8d 4c 24 20 80 e1 07 80 c1 03 <38> c1 0f 8c 43 ff ff ff 48 8d 7c 24 20 e8 68 02 43 fd e9 34 ff ff RSP: 0018:ffff8881ee7a7ba0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000004 RBX: 1ffff1103dcf4f74 RCX: ffff8881ee7a7b03 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8881ee7a7bc0 RBP: ffff8881ee7a7c30 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 R13: ffffffff87752040 R14: 1ffff1103dcf4f78 R15: ffff8881ee7a7bc0 spin_lock_bh include/linux/spinlock.h:343 [inline] tcp_metrics_flush_all net/ipv4/tcp_metrics.c:899 [inline] tcp_net_metrics_exit_batch+0x3a/0x1a0 net/ipv4/tcp_metrics.c:1030 ops_exit_list net/core/net_namespace.c:187 [inline] cleanup_net+0x6e2/0xc90 net/core/net_namespace.c:612 process_one_work+0x765/0xd20 kernel/workqueue.c:2290 worker_thread+0xaef/0x1470 kernel/workqueue.c:2436 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 The buggy address belongs to the page: page:ffffea0007b9e9c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 0000000000000000 ffffea0007b9e9c8 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893 __alloc_pages include/linux/gfp.h:503 [inline] __alloc_pages_node include/linux/gfp.h:516 [inline] alloc_pages_node include/linux/gfp.h:530 [inline] alloc_thread_stack_node kernel/fork.c:259 [inline] dup_task_struct+0x85/0x600 kernel/fork.c:886 copy_process+0x56d/0x3230 kernel/fork.c:1889 _do_fork+0x197/0x900 kernel/fork.c:2399 kernel_thread+0x16a/0x1d0 kernel/fork.c:2489 create_kthread kernel/kthread.c:311 [inline] kthreadd+0x3b1/0x4f0 kernel/kthread.c:654 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4955 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4961 __free_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0x44/0x180 mm/slub.c:2324 __slab_free+0x297/0x360 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0xdc/0x260 mm/slub.c:2854 kmem_cache_alloc_node_trace include/linux/slab.h:444 [inline] kmalloc_node include/linux/slab.h:594 [inline] kzalloc_node include/linux/slab.h:701 [inline] alloc_worker kernel/workqueue.c:1844 [inline] create_worker+0xee/0x830 kernel/workqueue.c:1938 maybe_create_worker kernel/workqueue.c:2109 [inline] manage_workers kernel/workqueue.c:2161 [inline] worker_thread+0x4ed/0x1470 kernel/workqueue.c:2408 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 addr ffff8881ee7a7ba0 is located in stack of task kworker/u4:3/438 at offset 0 in frame: _raw_spin_lock_bh+0x0/0x1b0 this frame has 1 object: [32, 36) 'val.i.i.i' Memory state around the buggy address: ffff8881ee7a7a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ee7a7b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881ee7a7b80: 00 00 00 00 f1 f1 f1 f1 04 f3 f3 f3 00 00 00 00 ^ ffff8881ee7a7c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ee7a7c80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 f3 f3 ================================================================== ---------------- Code disassembly (best guess): 0: 85 44 89 f9 test %eax,-0x7(%rcx,%rcx,4) 4: 80 e1 07 and $0x7,%cl 7: 80 c1 03 add $0x3,%cl a: 38 c1 cmp %al,%cl c: 0f 8c 34 ff ff ff jl 0xffffff46 12: 4c 89 ff mov %r15,%rdi 15: e8 fa 02 43 fd call 0xfd430314 1a: e9 27 ff ff ff jmp 0xffffff46 1f: 48 8d 4c 24 20 lea 0x20(%rsp),%rcx 24: 80 e1 07 and $0x7,%cl 27: 80 c1 03 add $0x3,%cl * 2a: 38 c1 cmp %al,%cl <-- trapping instruction 2c: 0f 8c 43 ff ff ff jl 0xffffff75 32: 48 8d 7c 24 20 lea 0x20(%rsp),%rdi 37: e8 68 02 43 fd call 0xfd4302a4 3c: e9 .byte 0xe9 3d: 34 ff xor $0xff,%al 3f: ff .byte 0xff