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: 26942 Comm: syz-executor.1 Not tainted 5.2.0-rc6-next-20190626 #23 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ax25_send_frame+0xe5/0x580 net/ax25/ax25_out.c:56 Code: 8a 00 00 48 85 c0 0f 85 d4 03 00 00 e8 a4 18 12 fb 49 8d bc 24 30 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 03 00 00 49 8b 84 24 30 03 00 00 48 85 c0 48 RSP: 0018:ffff8880ae909a88 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88809bcdba08 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff8660454c RDI: 0000000000000330 RBP: ffff8880ae909ac8 R08: 1ffffffff14a3561 R09: fffffbfff14a3562 R10: fffffbfff14a3561 R11: ffffffff8a51ab0f R12: 0000000000000000 R13: ffffffff8b3fffc0 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556ad7978 CR3: 000000005f846000 CR4: 00000000001506e0 Call Trace: rose_send_frame+0xda/0x280 net/rose/rose_link.c:106 rose_transmit_clear_request+0x1de/0x2a0 net/rose/rose_link.c:255 rose_rx_call_request+0x160c/0x19d4 net/rose/af_rose.c:987 rose_loopback_timer+0x164/0x480 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:535 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1068 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:kmem_cache_free+0xab/0x320 mm/slab.c:3695 Code: e8 8a 27 00 00 84 c0 74 77 41 f7 c6 00 02 00 00 74 4f e8 28 dd cb ff 48 83 3d 10 e6 26 07 00 0f 84 fa 01 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 8b 6d 08 0f 1f 44 00 00 65 8b 05 10 8f 55 7e 83 RSP: 0018:ffff88808c907840 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888098d82b58 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000282 RBP: ffff88808c907860 R08: ffff888057e52700 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aa413a80 R13: ffffffff819e3818 R14: 0000000000000282 R15: ffff88808c907a00 ptlock_free+0x38/0x42 mm/memory.c:4756 pgtable_page_dtor include/linux/mm.h:2001 [inline] ___pte_free_tlb+0x1e/0x160 arch/x86/mm/pgtable.c:48 __pte_free_tlb arch/x86/include/asm/pgalloc.h:60 [inline] free_pte_range mm/memory.c:200 [inline] free_pmd_range mm/memory.c:218 [inline] free_pud_range mm/memory.c:252 [inline] free_p4d_range mm/memory.c:286 [inline] free_pgd_range+0x8aa/0xe90 mm/memory.c:366 free_pgtables+0x236/0x2f0 mm/memory.c:398 exit_mmap+0x2c9/0x530 mm/mmap.c:3161 __mmput kernel/fork.c:1065 [inline] mmput+0x179/0x4d0 kernel/fork.c:1086 exit_mm kernel/exit.c:547 [inline] do_exit+0x84e/0x2ea0 kernel/exit.c:864 do_group_exit+0x135/0x360 kernel/exit.c:981 get_signal+0x47c/0x2500 kernel/signal.c:2728 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x251/0x2d0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f298498ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459519 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007ffcb3816fbf R14: 00007f298498d9c0 R15: 000000000075bf2c Modules linked in: ---[ end trace 1cd593eecf7a5cea ]--- RIP: 0010:ax25_send_frame+0xe5/0x580 net/ax25/ax25_out.c:56 Code: 8a 00 00 48 85 c0 0f 85 d4 03 00 00 e8 a4 18 12 fb 49 8d bc 24 30 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 03 00 00 49 8b 84 24 30 03 00 00 48 85 c0 48 RSP: 0018:ffff8880ae909a88 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88809bcdba08 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff8660454c RDI: 0000000000000330 RBP: ffff8880ae909ac8 R08: 1ffffffff14a3561 R09: fffffbfff14a3562 R10: fffffbfff14a3561 R11: ffffffff8a51ab0f R12: 0000000000000000 R13: ffffffff8b3fffc0 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556ad7978 CR3: 0000000008c6d000 CR4: 00000000001506e0