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: 18104 Comm: syz-executor.4 Not tainted 5.6.0-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:ffffc90000007b00 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88821501dc00 RCX: ffffffff86eaabf3 RDX: 000000000000006a RSI: ffffffff86eaad62 RDI: 0000000000000350 RBP: 0000000000000000 R08: ffff8880966c84c0 R09: ffffed100d075a1d R10: ffffed100d075a1c R11: ffff8880683ad0e3 R12: ffff88821501dc00 R13: 0000000000000078 R14: ffff8880a66053c0 R15: 0000000000000010 FS: 0000000000fbc940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004db9e8 CR3: 000000009fcbe000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rose_transmit_clear_request+0x1de/0x290 net/rose/rose_link.c:255 rose_rx_call_request+0x488/0x1960 net/rose/af_rose.c:976 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers kernel/time/timer.c:1774 [inline] __run_timers kernel/time/timer.c:1741 [inline] run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1787 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x192/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__find_get_block+0x275/0xe90 fs/buffer.c:1328 Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 f5 0a 00 00 48 83 3d 9d 76 ca 07 00 0f 84 52 08 00 00 e8 82 d3 a8 ff fb 66 0f 1f 44 00 00 <4d> 85 f6 0f 84 f0 01 00 00 e8 6d d3 a8 ff 0f 1f 44 00 00 e8 63 d3 RSP: 0018:ffffc90004a87a80 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8880966c84c0 RBX: ffff88804f23e868 RCX: 1ffffffff185c73c RDX: 0000000000000000 RSI: ffffffff81ca15de RDI: ffff8880966c8d7c RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff1856196 R10: fffffbfff1856195 R11: ffffffff8c2b0caf R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88804f23e868 R15: 0000000000000428 sb_find_get_block include/linux/buffer_head.h:338 [inline] recently_deleted fs/ext4/ialloc.c:683 [inline] find_inode_bit.isra.0+0x208/0x540 fs/ext4/ialloc.c:723 __ext4_new_inode+0x1854/0x57e0 fs/ext4/ialloc.c:915 ext4_symlink+0x44f/0xe50 fs/ext4/namei.c:3295 vfs_symlink fs/namei.c:4201 [inline] vfs_symlink+0x374/0x580 fs/namei.c:4187 do_symlinkat+0x215/0x280 fs/namei.c:4228 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c577 Code: 0f 1f 00 b8 5c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 6d b9 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 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdc5ef0f58 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c577 RDX: 00007ffdc5ef0ff3 RSI: 00000000004c2392 RDI: 00007ffdc5ef0fe0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000013 R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffdc5ef0f90 R14: 0000000000000000 R15: 00007ffdc5ef0fa0 Modules linked in: ---[ end trace f65c5aad817b1ebb ]--- 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:ffffc90000007b00 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88821501dc00 RCX: ffffffff86eaabf3 RDX: 000000000000006a RSI: ffffffff86eaad62 RDI: 0000000000000350 RBP: 0000000000000000 R08: ffff8880966c84c0 R09: ffffed100d075a1d R10: ffffed100d075a1c R11: ffff8880683ad0e3 R12: ffff88821501dc00 R13: 0000000000000078 R14: ffff8880a66053c0 R15: 0000000000000010 FS: 0000000000fbc940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004db9e8 CR3: 000000009fcbe000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400