general protection fault, probably for non-canonical address 0xdffffc0000000066: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000330-0x0000000000000337] CPU: 1 PID: 2295 Comm: syz-executor.5 Not tainted 5.7.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ax25_send_frame+0xe1/0x660 net/ax25/ax25_out.c:56 Code: c6 00 00 48 85 c0 0f 85 0c 04 00 00 e8 a8 53 74 fa 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 d2 04 00 00 49 8b 84 24 30 03 00 00 48 85 c0 48 RSP: 0018:ffffc90000da8ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a6cd9c08 RCX: 1ffffffff1877e51 RDX: 0000000000000066 RSI: ffffffff86fedf08 RDI: 0000000000000330 RBP: ffffffff8d242380 R08: 0000000000000001 R09: fffffbfff1860776 R10: ffffffff8c303baf R11: fffffbfff1860775 R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88809323bbc0 FS: 00007f2ab06be700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fa2b000 CR3: 0000000060c31000 CR4: 00000000001406e0 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+0x1de/0x290 net/rose/rose_link.c:255 rose_rx_call_request+0x488/0x1960 net/rose/af_rose.c:996 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1786 __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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:lock_acquire+0x267/0x8f0 kernel/locking/lockdep.c:4937 Code: 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c6 05 00 00 48 83 3d f5 37 3b 08 00 0f 84 65 04 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7 RSP: 0018:ffffc90004ec6cd8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff132980c RBX: ffff8880a1c0a380 RCX: ffffffff8159310b RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff1860735 R10: ffffffff8c3039a7 R11: fffffbfff1860734 R12: 0000000000000002 R13: ffffffff899bea40 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:601 [inline] ext4_mb_use_preallocated.constprop.0+0x6d3/0xe30 fs/ext4/mballoc.c:3492 ext4_mb_new_blocks+0xaa5/0x3940 fs/ext4/mballoc.c:4565 ext4_ext_map_blocks+0x1ffb/0x3710 fs/ext4/extents.c:4218 ext4_map_blocks+0x4cb/0x1650 fs/ext4/inode.c:621 ext4_iomap_alloc fs/ext4/inode.c:3403 [inline] ext4_iomap_begin+0x380/0x690 fs/ext4/inode.c:3442 iomap_apply+0x18c/0xcb0 fs/iomap/apply.c:46 iomap_dio_rw+0xa0b/0x1140 fs/iomap/direct-io.c:498 ext4_dio_write_iter fs/ext4/file.c:532 [inline] ext4_file_write_iter+0xf31/0x13f0 fs/ext4/file.c:640 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x5a8/0x850 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x18b/0x600 fs/read_write.c:980 vfs_iter_write+0x70/0xa0 fs/read_write.c:1040 iter_file_splice_write+0x684/0xb00 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1037 splice_direct_to_actor+0x38c/0x980 fs/splice.c:992 do_splice_direct+0x1b4/0x280 fs/splice.c:1080 do_sendfile+0x555/0xc50 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1576 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1568 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2ab06bdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00000000004fc540 RCX: 000000000045ca29 RDX: 0000000020000040 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000100000001 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008dc R14: 00000000004cba16 R15: 00007f2ab06be6d4 Modules linked in: ---[ end trace bddfdae8e6a35e71 ]--- RIP: 0010:ax25_send_frame+0xe1/0x660 net/ax25/ax25_out.c:56 Code: c6 00 00 48 85 c0 0f 85 0c 04 00 00 e8 a8 53 74 fa 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 d2 04 00 00 49 8b 84 24 30 03 00 00 48 85 c0 48 RSP: 0018:ffffc90000da8ab8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880a6cd9c08 RCX: 1ffffffff1877e51 RDX: 0000000000000066 RSI: ffffffff86fedf08 RDI: 0000000000000330 RBP: ffffffff8d242380 R08: 0000000000000001 R09: fffffbfff1860776 R10: ffffffff8c303baf R11: fffffbfff1860775 R12: 0000000000000000 R13: 0000000000000104 R14: 0000000000000000 R15: ffff88809323bbc0 FS: 00007f2ab06be700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fa2b000 CR3: 0000000060c31000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400