CPU: 0 PID: 18993 Comm: syz-executor4 Not tainted 4.9.62-gf09daf1 #91 device gre0 entered promiscuous mode Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801c5e5f940[ 119.452996] kasan: CONFIG_KASAN_INLINE enabled 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: 1 PID: 19023 Comm: syz-executor3 Not tainted 4.9.62-gf09daf1 #91 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d5341800 task.stack: ffff8801ce9c8000 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:ffff8801ce9cf9b0 EFLAGS: 00010a07 RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffc90000e6e000 RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c RBP: ffff8801ce9cf9c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 R13: 0000000000000020 R14: ffff8801cc32a100 R15: dffffc0000000000 FS: 00007f5b52318700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020d91000 CR3: 00000001a6a8e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d5341800 ffff8801cc32a258 ffff8801ce9cfa20 ffffffff826635a1[ 119.453137] ffff8801cc32a270 ffffed003986544b ffffed003986544e ffff8801cc32a268[ 119.453150] dead4ead00000000 ffff8801cc32a240 0000000000000000 0000000000000000[ 119.453162] 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+0x8bd/0x1440 drivers/scsi/sg.c:456 [] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714 [] do_loop_readv_writev fs/read_write.c:880 [inline] [] do_readv_writev+0x520/0x750 fs/read_write.c:874 [] vfs_readv+0x84/0xc0 fs/read_write.c:898 [] do_readv+0xe6/0x250 fs/read_write.c:924 [] SYSC_readv fs/read_write.c:1011 [inline] [] SyS_readv+0x27/0x30 fs/read_write.c:1008 [] 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 [ 119.453544] 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 c3047c37b6b25134 ]--- Kernel panic - not syncing: Fatal exception ffffffff81d94429 ffff8801c5e5fc20 0000000000000000 ffff8801c9d13010 ffff8801c5e5fb10 ffff8801c9d12f00 ffff8801c5e5fb38 ffffffff816623c7 0000000000002871 ffff8801ca9d68f0 ffff8801ca9d68a0 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 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..