================================================================== BUG: KASAN: slab-out-of-bounds in expire_timers kernel/time/timer.c:1484 [inline] BUG: KASAN: slab-out-of-bounds in __run_timers+0x7bd/0xb60 kernel/time/timer.c:1817 Read of size 8 at addr ffff8881c73af1d8 by task kworker/0:1/13 CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: rcu_gp process_srcu Call Trace: __dump_stack+0x1e/0x20 lib/dump_stack.c:77 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384 __kasan_report+0xef/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 expire_timers kernel/time/timer.c:1484 [inline] __run_timers+0x7bd/0xb60 kernel/time/timer.c:1817 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830 __do_softirq+0x236/0x660 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x197/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:236 [inline] RIP: 0010:delay_tsc+0x74/0xc0 arch/x86/lib/delay.c:61 Code: 00 e8 b0 43 1b fd 65 8b 05 c5 5c dc 7b 85 c0 74 1d f3 90 bf 01 00 00 00 e8 e9 41 1b fd e8 a4 69 fa fd 41 39 c6 75 0e 0f 01 f9 <66> 90 eb bc e8 a3 16 da fc eb dc 4c 29 e3 e8 89 69 fa fd 41 89 c6 RSP: 0018:ffff8881f5defb88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 00000000cf4b9c84 RBX: 0000000000002af9 RCX: 0000000000000000 RDX: 0000000000000022 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8881f5defba8 R08: dffffc0000000000 R09: ffffed103ebbdf79 R10: ffffed103ebbdf79 R11: 1ffff1103ebbdf78 R12: 00000000000016fc R13: 0000000000000b18 R14: 0000000000000000 R15: 00000022cf4b8477 __delay arch/x86/lib/delay.c:161 [inline] __const_udelay+0x61/0x70 arch/x86/lib/delay.c:175 try_check_zero+0x2dc/0x350 kernel/rcu/srcutree.c:708 srcu_advance_state kernel/rcu/srcutree.c:1146 [inline] process_srcu+0x183/0xc60 kernel/rcu/srcutree.c:1241 process_one_work+0x73b/0xcc0 kernel/workqueue.c:2290 worker_thread+0xa5c/0x13b0 kernel/workqueue.c:2436 kthread+0x31e/0x3a0 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Allocated by task 1773: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529 kasan_kmalloc+0xd/0x20 mm/kasan/common.c:543 kmem_cache_alloc_trace+0x112/0x290 mm/slub.c:2856 kmalloc include/linux/slab.h:556 [inline] __hw_addr_create_ex net/core/dev_addr_lists.c:30 [inline] __hw_addr_add_ex+0x182/0x5b0 net/core/dev_addr_lists.c:76 __hw_addr_add net/core/dev_addr_lists.c:84 [inline] dev_addr_init+0x118/0x1f0 net/core/dev_addr_lists.c:464 alloc_netdev_mqs+0x124/0xc50 net/core/dev.c:9640 __ip_tunnel_create+0x206/0x380 net/ipv4/ip_tunnel.c:254 ip_tunnel_init_net+0x277/0x710 net/ipv4/ip_tunnel.c:1076 ipgre_tap_init_net+0x29/0x30 net/ipv4/ip_gre.c:1704 ops_init+0x1ba/0x4a0 net/core/net_namespace.c:141 setup_net+0x20c/0x9b0 net/core/net_namespace.c:348 copy_net_ns+0x314/0x520 net/core/net_namespace.c:489 create_new_namespaces+0x49c/0x590 kernel/nsproxy.c:103 copy_namespaces+0x17e/0x1c0 kernel/nsproxy.c:161 copy_process+0x1194/0x2cf0 kernel/fork.c:2055 _do_fork+0x190/0x860 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x12e/0x160 kernel/fork.c:2538 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8881c73af180 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 88 bytes inside of 96-byte region [ffff8881c73af180, ffff8881c73af1e0) The buggy address belongs to the page: page:ffffea00071cebc0 refcount:1 mapcount:0 mapping:ffff8881f5c02f00 index:0x0 flags: 0x8000000000000200(slab) raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881f5c02f00 raw: 0000000000000000 0000000000200020 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x35e/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894 alloc_slab_page+0x3c/0x3b0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x93/0x420 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x29e/0x420 mm/slub.c:2667 __slab_alloc+0x63/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0x130/0x290 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] __hw_addr_create_ex net/core/dev_addr_lists.c:30 [inline] __hw_addr_add_ex+0x182/0x5b0 net/core/dev_addr_lists.c:76 __hw_addr_add net/core/dev_addr_lists.c:84 [inline] dev_addr_init+0x118/0x1f0 net/core/dev_addr_lists.c:464 alloc_netdev_mqs+0x124/0xc50 net/core/dev.c:9640 __ip_tunnel_create+0x206/0x380 net/ipv4/ip_tunnel.c:254 ip_tunnel_init_net+0x277/0x710 net/ipv4/ip_tunnel.c:1076 erspan_init_net+0x29/0x30 net/ipv4/ip_gre.c:1721 ops_init+0x1ba/0x4a0 net/core/net_namespace.c:141 setup_net+0x20c/0x9b0 net/core/net_namespace.c:348 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+0x7e4/0x910 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4956 [inline] __free_pages+0x8c/0x110 mm/page_alloc.c:4962 kfree+0x1ca/0x260 mm/slub.c:4068 kvfree+0x4c/0x50 mm/util.c:625 bpf_check+0x8371/0x9cf0 kernel/bpf/verifier.c:9731 bpf_prog_load+0xa5f/0xe10 kernel/bpf/syscall.c:1724 __do_sys_bpf kernel/bpf/syscall.c:2891 [inline] __se_sys_bpf+0x435/0x570 kernel/bpf/syscall.c:2849 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881c73af080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8881c73af100: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff8881c73af180: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff8881c73af200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8881c73af280: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 0 P4D 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13 Comm: kworker/0:1 Tainted: G B 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: rcu_gp process_srcu RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f5dc3f00 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881c73af1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: fffffbfff0ca7a5c R11: 1ffffffff0ca7a5c R12: 00000000ffffa440 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c73af1c0 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x81d/0xb60 kernel/time/timer.c:1817 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830 __do_softirq+0x236/0x660 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x197/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:236 [inline] RIP: 0010:delay_tsc+0x74/0xc0 arch/x86/lib/delay.c:61 Code: 00 e8 b0 43 1b fd 65 8b 05 c5 5c dc 7b 85 c0 74 1d f3 90 bf 01 00 00 00 e8 e9 41 1b fd e8 a4 69 fa fd 41 39 c6 75 0e 0f 01 f9 <66> 90 eb bc e8 a3 16 da fc eb dc 4c 29 e3 e8 89 69 fa fd 41 89 c6 RSP: 0018:ffff8881f5defb88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 00000000cf4b9c84 RBX: 0000000000002af9 RCX: 0000000000000000 RDX: 0000000000000022 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8881f5defba8 R08: dffffc0000000000 R09: ffffed103ebbdf79 R10: ffffed103ebbdf79 R11: 1ffff1103ebbdf78 R12: 00000000000016fc R13: 0000000000000b18 R14: 0000000000000000 R15: 00000022cf4b8477 __delay arch/x86/lib/delay.c:161 [inline] __const_udelay+0x61/0x70 arch/x86/lib/delay.c:175 try_check_zero+0x2dc/0x350 kernel/rcu/srcutree.c:708 srcu_advance_state kernel/rcu/srcutree.c:1146 [inline] process_srcu+0x183/0xc60 kernel/rcu/srcutree.c:1241 process_one_work+0x73b/0xcc0 kernel/workqueue.c:2290 worker_thread+0xa5c/0x13b0 kernel/workqueue.c:2436 kthread+0x31e/0x3a0 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Modules linked in: CR2: 0000000000000000 ---[ end trace c097759bf8afac8d ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881f5dc3f00 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881c73af1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: fffffbfff0ca7a5c R11: 1ffffffff0ca7a5c R12: 00000000ffffa440 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881c73af1c0 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000005c0e000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 00 e8 add %ch,%al 2: b0 43 mov $0x43,%al 4: 1b fd sbb %ebp,%edi 6: 65 8b 05 c5 5c dc 7b mov %gs:0x7bdc5cc5(%rip),%eax # 0x7bdc5cd2 d: 85 c0 test %eax,%eax f: 74 1d je 0x2e 11: f3 90 pause 13: bf 01 00 00 00 mov $0x1,%edi 18: e8 e9 41 1b fd call 0xfd1b4206 1d: e8 a4 69 fa fd call 0xfdfa69c6 22: 41 39 c6 cmp %eax,%r14d 25: 75 0e jne 0x35 27: 0f 01 f9 rdtscp * 2a: 66 90 xchg %ax,%ax <-- trapping instruction 2c: eb bc jmp 0xffffffea 2e: e8 a3 16 da fc call 0xfcda16d6 33: eb dc jmp 0x11 35: 4c 29 e3 sub %r12,%rbx 38: e8 89 69 fa fd call 0xfdfa69c6 3d: 41 89 c6 mov %eax,%r14d