general protection fault, probably for non-canonical address 0xdffffc000000006a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000350-0x0000000000000357] CPU: 0 PID: 22629 Comm: syz-executor.2 Not tainted 5.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101 Code: 48 c1 ea 03 80 3c 02 00 0f 85 06 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 8d bd 50 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 00 00 00 4c 8b bd 50 03 00 00 e9 77 fe ff ff RSP: 0018:ffffc90000007b18 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a75b0800 RCX: ffffffff8711d583 RDX: 000000000000006a RSI: ffffffff8711d6f2 RDI: 0000000000000350 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8880589608e3 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a75b0800 R13: 0000000000000078 R14: ffff8880a8fc8340 R15: 0000000000000010 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31325000 CR3: 000000009c26e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255 rose_rx_call_request+0x4bd/0x1978 net/rose/af_rose.c:998 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1773 __run_timers kernel/time/timer.c:1745 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1786 __do_softirq+0x34c/0xa60 kernel/softirq.c:292 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:387 [inline] __irq_exit_rcu kernel/softirq.c:417 [inline] irq_exit_rcu+0x229/0x270 kernel/softirq.c:429 sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587 RIP: 0010:compound_head include/linux/page-flags.h:184 [inline] RIP: 0010:PageAnon include/linux/page-flags.h:479 [inline] RIP: 0010:zap_pte_range mm/memory.c:1079 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1193 [inline] RIP: 0010:zap_pud_range mm/memory.c:1222 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1243 [inline] RIP: 0010:unmap_page_range+0xcc2/0x2940 mm/memory.c:1264 Code: 20 08 4d 85 ed 0f 84 22 03 00 00 e8 28 8a d0 ff 4d 8d 65 08 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 0f 85 bd 18 00 00 49 8b 45 08 <31> ff 4c 89 ed 48 89 c3 48 89 84 24 b8 00 00 00 83 e3 01 48 89 de RSP: 0018:ffffc90008557790 EFLAGS: 00000246 RAX: ffffea0002357f88 RBX: 0000000000000001 RCX: ffffc90008557a58 RDX: ffff8880a2224400 RSI: ffffffff81a320c8 RDI: ffffc90008557a70 RBP: ffffc90008557a78 R08: 0000000000000000 R09: ffff8880a2224407 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0002357f08 R13: ffffea0002357f00 R14: dffffc0000000000 R15: 0000000000414000 unmap_single_vma+0x198/0x300 mm/memory.c:1309 unmap_vmas+0x16f/0x2f0 mm/memory.c:1341 exit_mmap+0x2b1/0x510 mm/mmap.c:3150 __mmput+0x122/0x470 kernel/fork.c:1093 mmput+0x53/0x60 kernel/fork.c:1114 exit_mm kernel/exit.c:482 [inline] do_exit+0xa8b/0x29f0 kernel/exit.c:792 do_group_exit+0x125/0x310 kernel/exit.c:902 get_signal+0x40b/0x1ee0 kernel/signal.c:2743 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x156/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1f9 Code: Bad RIP value. RSP: 002b:00007f4ef4b58cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078bf08 RCX: 000000000045c1f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bf08 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffed0d4fe9f R14: 00007f4ef4b599c0 R15: 000000000078bf0c Modules linked in: ---[ end trace a0b5c10d9a1cd077 ]--- RIP: 0010:rose_send_frame+0x1dd/0x2f0 net/rose/rose_link.c:101 Code: 48 c1 ea 03 80 3c 02 00 0f 85 06 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 8d bd 50 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 00 00 00 4c 8b bd 50 03 00 00 e9 77 fe ff ff RSP: 0018:ffffc90000007b18 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a75b0800 RCX: ffffffff8711d583 RDX: 000000000000006a RSI: ffffffff8711d6f2 RDI: 0000000000000350 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff8880589608e3 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a75b0800 R13: 0000000000000078 R14: ffff8880a8fc8340 R15: 0000000000000010 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31325000 CR3: 000000009c26e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400