Unable to handle kernel paging request at virtual address dfff800000000001 KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000001] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 UID: 0 PID: 7091 Comm: syz-executor Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : _compound_head include/linux/page-flags.h:242 [inline] pc : put_page include/linux/mm.h:1552 [inline] pc : skb_page_unref include/linux/skbuff_ref.h:43 [inline] pc : __skb_frag_unref+0x80/0x214 include/linux/skbuff_ref.h:56 lr : netmem_to_page include/net/netmem.h:83 [inline] lr : skb_page_unref include/linux/skbuff_ref.h:43 [inline] lr : __skb_frag_unref+0x78/0x214 include/linux/skbuff_ref.h:56 sp : ffff800080016d20 x29: ffff800080016d20 x28: dfff800000000000 x27: 0000000000000007 x26: ffff0000d9c7eb40 x25: ffff0000d9c7eb70 x24: 0000000000000000 x23: ffff0000d9c7eb42 x22: 1fffe0001b38fd68 x21: dfff800000000000 x20: 0000000000000008 x19: 0000000000000000 x18: ffff0000d0be9d0c x17: ffff80008a012b88 x16: ffff80008069d39c x15: 0000000000000001 x14: 1fffe0001b38fd6c x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001b38fd6d x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000001 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800089793364 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: _compound_head include/linux/page-flags.h:242 [inline] (P) put_page include/linux/mm.h:1552 [inline] (P) skb_page_unref include/linux/skbuff_ref.h:43 [inline] (P) __skb_frag_unref+0x80/0x214 include/linux/skbuff_ref.h:56 (P) skb_release_data+0x3c4/0x618 net/core/skbuff.c:1119 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb+0x58/0x78 net/core/skbuff.c:1204 tcp_wmem_free_skb include/net/tcp.h:306 [inline] tcp_rtx_queue_unlink_and_free+0x2e8/0x4a8 include/net/tcp.h:2091 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3436 [inline] tcp_ack+0x1c84/0x5598 net/ipv4/tcp_input.c:4032 tcp_rcv_state_process+0x50c/0x3b84 net/ipv4/tcp_input.c:6805 tcp_v4_do_rcv+0x71c/0xc44 net/ipv4/tcp_ipv4.c:1939 tcp_v4_rcv+0x2498/0x2dbc net/ipv4/tcp_ipv4.c:2351 ip_protocol_deliver_rcu+0x1f8/0x484 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x284/0x4f0 net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0x220/0x24c net/ipv4/ip_input.c:447 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:567 __netif_receive_skb_one_core net/core/dev.c:5672 [inline] __netif_receive_skb+0x18c/0x3c8 net/core/dev.c:5785 process_backlog+0x640/0x123c net/core/dev.c:6117 __napi_poll+0xb4/0x3fc net/core/dev.c:6883 napi_poll net/core/dev.c:6952 [inline] net_rx_action+0x6a8/0xf4c net/core/dev.c:7074 handle_softirqs+0x320/0xd34 kernel/softirq.c:561 __do_softirq+0x14/0x20 kernel/softirq.c:595 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:442 [inline] __irq_exit_rcu+0x1d8/0x544 kernel/softirq.c:662 irq_exit_rcu+0x14/0x84 kernel/softirq.c:678 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_acquire+0x278/0x724 kernel/locking/lockdep.c:5852 (P) rcu_lock_acquire+0x40/0x4c include/linux/rcupdate.h:337 rcu_read_lock include/linux/rcupdate.h:849 [inline] page_ref_add_unless include/linux/page_ref.h:235 [inline] folio_ref_add_unless include/linux/page_ref.h:248 [inline] folio_try_get+0x24/0x26c include/linux/page_ref.h:264 next_uptodate_folio+0xd8/0x538 mm/filemap.c:3504 filemap_map_pages+0xdbc/0x1718 mm/filemap.c:3687 do_fault_around mm/memory.c:5280 [inline] do_read_fault mm/memory.c:5313 [inline] do_fault mm/memory.c:5456 [inline] do_pte_missing mm/memory.c:3979 [inline] handle_pte_fault+0x2d0c/0x5890 mm/memory.c:5801 __handle_mm_fault mm/memory.c:5944 [inline] handle_mm_fault+0xf0c/0x17b0 mm/memory.c:6112 do_page_fault+0x404/0x10a8 arch/arm64/mm/fault.c:647 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: 37000653 979e07ef 91002274 d343fe88 (38756908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 37000653 tbnz w19, #0, 0xc8 4: 979e07ef bl 0xfffffffffe781fc0 8: 91002274 add x20, x19, #0x8 c: d343fe88 lsr x8, x20, #3 * 10: 38756908 ldrb w8, [x8, x21] <-- trapping instruction