general protection fault, probably for non-canonical address 0xdffffc0000000066: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000330-0x0000000000000337] CPU: 0 PID: 5918 Comm: syz-executor.5 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:337 [inline] RIP: 0010:ax25_send_frame+0xe4/0x640 net/ax25/ax25_out.c:56 Code: 00 48 85 c0 49 89 c4 0f 85 fb 03 00 00 e8 54 d2 5c fa 49 8d bd 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 b1 04 00 00 4d 8b ad 30 03 00 00 4d 85 ed 0f 84 RSP: 0018:ffffc90000007ad0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a8fd9408 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff8716dbbc RDI: 0000000000000330 RBP: ffffffff8d50d920 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000001935940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052a238 CR3: 0000000042710000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rose_send_frame+0xcc/0x2f0 net/rose/rose_link.c:106 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:1416 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1792 __run_timers kernel/time/timer.c:1764 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1805 __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:585 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197 Code: 5d be 03 00 00 00 e9 46 61 24 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 00 ff 01 00 <65> 8b 05 a0 50 8e 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 RSP: 0018:ffffc90004b27868 EFLAGS: 00000213 RAX: 0000000000000000 RBX: ffffffff89b9e554 RCX: ffffffff817008e5 RDX: ffff8880428d6040 RSI: ffff8880428d6040 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff8880867f34d7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: dffffc0000000000 R15: 00000000fffffffe map_id_up_base kernel/user_namespace.c:331 [inline] map_id_up+0x289/0x2f0 kernel/user_namespace.c:360 from_kgid+0x87/0xc0 kernel/user_namespace.c:476 i_gid_read include/linux/fs.h:1581 [inline] ext4_do_update_inode fs/ext4/inode.c:4976 [inline] ext4_mark_iloc_dirty+0x43e/0x3700 fs/ext4/inode.c:5624 __ext4_mark_inode_dirty+0x237/0x910 fs/ext4/inode.c:5818 __ext4_new_inode+0x2166/0x5390 fs/ext4/ialloc.c:1193 ext4_symlink+0x4b0/0xe10 fs/ext4/namei.c:3303 vfs_symlink fs/namei.c:3953 [inline] vfs_symlink+0x453/0x6a0 fs/namei.c:3939 do_symlinkat+0x258/0x2c0 fs/namei.c:3980 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca07 Code: 0f 1f 00 b8 5c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ed b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 cd b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc69b00f28 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045ca07 RDX: 00007ffc69b00fc3 RSI: 00000000004c28a4 RDI: 00007ffc69b00fb0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000013 R10: 0000000000000075 R11: 0000000000000206 R12: 0000000000000001 R13: 00007ffc69b00f60 R14: 0000000000000000 R15: 00007ffc69b00f70 Modules linked in: ---[ end trace 319e8610ee8d951e ]--- RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:337 [inline] RIP: 0010:ax25_send_frame+0xe4/0x640 net/ax25/ax25_out.c:56 Code: 00 48 85 c0 49 89 c4 0f 85 fb 03 00 00 e8 54 d2 5c fa 49 8d bd 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 b1 04 00 00 4d 8b ad 30 03 00 00 4d 85 ed 0f 84 RSP: 0018:ffffc90000007ad0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a8fd9408 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff8716dbbc RDI: 0000000000000330 RBP: ffffffff8d50d920 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000001935940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052a238 CR3: 0000000042710000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400