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: 2832 Comm: syz-executor.2 Not tainted 5.8.0-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:ffffc90000007b08 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888099b74800 RCX: ffffffff8716d623 RDX: 000000000000006a RSI: ffffffff8716d792 RDI: 0000000000000350 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888091a418e3 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888099b74800 R13: 0000000000000078 R14: ffff88808e32c080 R15: 0000000000000010 FS: 000000000266d940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052a238 CR3: 00000000a31c3000 CR4: 00000000001506f0 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:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __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+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:lock_acquire+0x27b/0xad0 kernel/locking/lockdep.c:5008 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d 0a eb 5b 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7 RSP: 0018:ffffc900171479d0 EFLAGS: 00000282 RAX: 1ffffffff136c761 RBX: ffff8880a71282c0 RCX: 000000002ea3a894 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5dba27 R10: fffffbfff18bb744 R11: 0000000000000001 R12: 0000000000000002 R13: ffffffff89bd6980 R14: 0000000000000000 R15: ffff8880a71282c0 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] ext4_get_group_desc+0x11c/0x4e0 fs/ext4/balloc.c:284 recently_deleted fs/ext4/ialloc.c:678 [inline] find_inode_bit+0x1b8/0x570 fs/ext4/ialloc.c:724 __ext4_new_inode+0xc83/0x5390 fs/ext4/ialloc.c:927 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+0x2d/0x70 arch/x86/entry/common.c:46 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:00007fff5b460a48 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045ca07 RDX: 00007fff5b460ae7 RSI: 00000000004c289b RDI: 00007fff5b460ad0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000017 R10: 0000000000000075 R11: 0000000000000206 R12: 0000000000000001 R13: 00007fff5b460a80 R14: 0000000000000000 R15: 00007fff5b460a90 Modules linked in: ---[ end trace e09d9c6ff378ed1d ]--- 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:ffffc90000007b08 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888099b74800 RCX: ffffffff8716d623 RDX: 000000000000006a RSI: ffffffff8716d792 RDI: 0000000000000350 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff888091a418e3 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888099b74800 R13: 0000000000000078 R14: ffff88808e32c080 R15: 0000000000000010 FS: 000000000266d940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052a238 CR3: 00000000a31c3000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400