================================================================== BUG: KASAN: use-after-free in hlist_move_list include/linux/list.h:870 [inline] BUG: KASAN: use-after-free in __collect_expired_timers kernel/time/timer.c:1484 [inline] BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1719 [inline] BUG: KASAN: use-after-free in __run_timers+0x521/0xbe0 kernel/time/timer.c:1783 Write of size 8 at addr ffff8881e30fb1c8 by task ksoftirqd/1/17 CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 5.4.268-syzkaller-00012-g51cf29fc2bfc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 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 hlist_move_list include/linux/list.h:870 [inline] __collect_expired_timers kernel/time/timer.c:1484 [inline] collect_expired_timers kernel/time/timer.c:1719 [inline] __run_timers+0x521/0xbe0 kernel/time/timer.c:1783 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:603 smpboot_thread_fn+0x545/0x930 kernel/smpboot.c:165 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Allocated by task 367: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 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+0xd9/0x250 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x7a/0x4d0 net/core/skbuff.c:198 alloc_skb_fclone include/linux/skbuff.h:1130 [inline] sk_stream_alloc_skb+0x1f4/0xa70 net/ipv4/tcp.c:888 tcp_sendmsg_locked+0xe07/0x3810 net/ipv4/tcp.c:1297 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1447 sock_sendmsg_nosec net/socket.c:638 [inline] __sock_sendmsg net/socket.c:650 [inline] sock_write_iter+0x344/0x470 net/socket.c:1009 call_write_iter include/linux/fs.h:1983 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5d3/0x750 fs/read_write.c:496 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 367: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3206 [inline] tcp_ack+0x206c/0x6090 net/ipv4/tcp_input.c:3757 tcp_rcv_established+0xd16/0x1a80 net/ipv4/tcp_input.c:5715 tcp_v4_do_rcv+0x3a9/0x770 net/ipv4/tcp_ipv4.c:1589 tcp_v4_rcv+0x219a/0x26f0 net/ipv4/tcp_ipv4.c:1971 ip_protocol_deliver_rcu+0x2e0/0x630 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] ip_local_deliver+0x2c6/0x5a0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:444 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:541 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:579 [inline] ip_sublist_rcv+0xc02/0xc80 net/ipv4/ip_input.c:587 ip_list_rcv+0x477/0x4c0 net/ipv4/ip_input.c:621 __netif_receive_skb_list_ptype net/core/dev.c:5015 [inline] __netif_receive_skb_list_core+0x6dd/0x8f0 net/core/dev.c:5063 __netif_receive_skb_list net/core/dev.c:5115 [inline] netif_receive_skb_list_internal+0x944/0xc90 net/core/dev.c:5210 gro_normal_list net/core/dev.c:5321 [inline] napi_complete_done+0x20a/0x580 net/core/dev.c:6052 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline] virtnet_poll+0xb61/0x1250 drivers/net/virtio_net.c:1516 napi_poll net/core/dev.c:6367 [inline] net_rx_action+0x53f/0x1160 net/core/dev.c:6435 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881e30fb180 which belongs to the cache skbuff_fclone_cache of size 488 The buggy address is located 72 bytes inside of 488-byte region [ffff8881e30fb180, ffff8881e30fb368) The buggy address belongs to the page: page:ffffea00078c3e80 refcount:1 mapcount:0 mapping:ffff8881f1cc5900 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f1cc5900 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL) 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:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0x109/0x250 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x7a/0x4d0 net/core/skbuff.c:198 alloc_skb_fclone include/linux/skbuff.h:1130 [inline] sk_stream_alloc_skb+0x1f4/0xa70 net/ipv4/tcp.c:888 tcp_sendmsg_locked+0xe07/0x3810 net/ipv4/tcp.c:1297 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1447 sock_sendmsg_nosec net/socket.c:638 [inline] __sock_sendmsg net/socket.c:650 [inline] sock_write_iter+0x344/0x470 net/socket.c:1009 call_write_iter include/linux/fs.h:1983 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5d3/0x750 fs/read_write.c:496 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 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:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 bpf_check+0x8aaa/0xb340 kernel/bpf/verifier.c:9731 bpf_prog_load kernel/bpf/syscall.c:1724 [inline] __do_sys_bpf kernel/bpf/syscall.c:2891 [inline] __se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881e30fb080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff8881e30fb100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881e30fb180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e30fb200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e30fb280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 17 Comm: ksoftirqd/1 Tainted: G B 5.4.268-syzkaller-00012-g51cf29fc2bfc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1452 [inline] RIP: 0010:__run_timers+0x7b0/0xbe0 kernel/time/timer.c:1787 Code: 89 e7 e8 e3 4b 3f 00 4d 89 2c 24 4d 85 ed 74 2e e8 45 68 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 b2 4b 3f 00 4d 89 65 00 eb 05 e8 17 RSP: 0018:ffff8881f5e2fba0 EFLAGS: 00010006 RAX: 00000275c8000003 RBX: 1ffff1103c61f639 RCX: dffffc0000000000 RDX: 0000000000000101 RSI: 0000000000000008 RDI: ffff8881e30fb1c8 RBP: ffff8881f5e2fd08 R08: ffffffff8154de0c R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881f5e2fc60 R13: 000013ae40000019 R14: 1ffff1103c61f638 R15: ffff8881e30fb1c8 FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556303818 CR3: 00000001dfe4c000 CR4: 00000000003406a0 DR0: 0000000020000240 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1800 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:603 smpboot_thread_fn+0x545/0x930 kernel/smpboot.c:165 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 Modules linked in: ---[ end trace 64c1c37df9c407bb ]--- RIP: 0010:__hlist_del include/linux/list.h:791 [inline] RIP: 0010:detach_timer kernel/time/timer.c:824 [inline] RIP: 0010:expire_timers kernel/time/timer.c:1452 [inline] RIP: 0010:__run_timers+0x7b0/0xbe0 kernel/time/timer.c:1787 Code: 89 e7 e8 e3 4b 3f 00 4d 89 2c 24 4d 85 ed 74 2e e8 45 68 0f 00 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 b2 4b 3f 00 4d 89 65 00 eb 05 e8 17 RSP: 0018:ffff8881f5e2fba0 EFLAGS: 00010006 RAX: 00000275c8000003 RBX: 1ffff1103c61f639 RCX: dffffc0000000000 RDX: 0000000000000101 RSI: 0000000000000008 RDI: ffff8881e30fb1c8 RBP: ffff8881f5e2fd08 R08: ffffffff8154de0c R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8881f5e2fc60 R13: 000013ae40000019 R14: 1ffff1103c61f638 R15: ffff8881e30fb1c8 FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556303818 CR3: 00000001dfe4c000 CR4: 00000000003406a0 DR0: 0000000020000240 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 89 e7 mov %esp,%edi 2: e8 e3 4b 3f 00 call 0x3f4bea 7: 4d 89 2c 24 mov %r13,(%r12) b: 4d 85 ed test %r13,%r13 e: 74 2e je 0x3e 10: e8 45 68 0f 00 call 0xf685a 15: 49 83 c5 08 add $0x8,%r13 19: 4c 89 e8 mov %r13,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ef mov %r13,%rdi 33: e8 b2 4b 3f 00 call 0x3f4bea 38: 4d 89 65 00 mov %r12,0x0(%r13) 3c: eb 05 jmp 0x43 3e: e8 .byte 0xe8 3f: 17 (bad)