kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 16703 Comm: syz-executor4 Not tainted 4.9.58-g3861f0b #75 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d66b1800 task.stack: ffff8801caff0000 RIP: 0010:[] [] __read_once_size include/linux/compiler.h:243 [inline] [] atomic_read arch/x86/include/asm/atomic.h:26 [inline] [] page_ref_count include/linux/page_ref.h:66 [inline] [] put_page_testzero include/linux/mm.h:445 [inline] [] __free_pages+0x21/0x80 mm/page_alloc.c:3901 RSP: 0018:ffff8801caff7ab0 EFLAGS: 00010a07 RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffc90002249000 RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c RBP: ffff8801caff7ac0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8801d66b1800 R12: 0000000000000004 R13: 0000000000000020 R14: ffff8801a5b64200 R15: dffffc0000000000 FS: 00007f5dd75ab700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020221339 CR3: 00000001a8e7c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d66b1800 ffff8801a5b64358 ffff8801caff7b20 ffffffff8265fcb1[ 115.680839] ffff8801a5b64370 ffffed0034b6c86b ffffed0034b6c86e ffff8801a5b64368[ 115.680851] dead4ead00000000 ffff8801a5b64340 0000000000000000 0000000000000000[ 115.680860] Call Trace: [] sg_remove_scat.isra.20+0x1c1/0x2d0 drivers/scsi/sg.c:1954 [] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836 [] sg_new_read.isra.21+0x39/0x3e0 drivers/scsi/sg.c:567 [] sg_read+0x8a6/0x1400 drivers/scsi/sg.c:456 [] __vfs_read+0x103/0x670 fs/read_write.c:452 [] vfs_read+0x107/0x330 fs/read_write.c:475 [] SYSC_read fs/read_write.c:591 [inline] [] SyS_read+0xd9/0x1b0 fs/read_write.c:584 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Code: ff 66 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d [ 115.681190] RIP [] __read_once_size include/linux/compiler.h:243 [inline] [] atomic_read arch/x86/include/asm/atomic.h:26 [inline] [] page_ref_count include/linux/page_ref.h:66 [inline] [] put_page_testzero include/linux/mm.h:445 [inline] [] __free_pages+0x21/0x80 mm/page_alloc.c:3901 ---[ end trace 17e45105ed08f5f6 ]--- Kernel panic - not syncing: Fatal exception ffffffff81d91149 ffff8801a82b77c0 0000000000000000 ffff8801a816ed10 ffff8801a82b76b0 ffff8801a816ec00 ffff8801a82b76d8 ffffffff8165fa97 ffff880102408040 ffff8801a82b7630 00000001d6204067 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] handle_userfault+0xa37/0x1300 fs/userfaultfd.c:323 [] do_anonymous_page mm/memory.c:2747 [inline] [] handle_pte_fault mm/memory.c:3488 [inline] [] __handle_mm_fault mm/memory.c:3577 [inline] [] handle_mm_fault+0x1fd1/0x2530 mm/memory.c:3614 [] __do_page_fault+0x5b7/0xd70 arch/x86/mm/fault.c:1396 [] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1460 [] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012 [] generic_perform_write+0x1dc/0x500 mm/filemap.c:2731 [] __generic_file_write_iter+0x348/0x570 mm/filemap.c:2866 [] generic_file_write_iter+0x2d5/0x600 mm/filemap.c:2894 [] new_sync_write fs/read_write.c:499 [inline] [] __vfs_write+0x4bf/0x680 fs/read_write.c:512 [] vfs_write+0x170/0x4e0 fs/read_write.c:560 [] SYSC_write fs/read_write.c:607 [inline] [] SyS_write+0xd9/0x1b0 fs/read_write.c:599 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..