page:ffffea00029574c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x1fffc0000000000() raw: 01fffc0000000000 ffffea00029e5948 ffffea000290f108 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:579! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7573 Comm: syz-executor020 Not tainted 5.0.0-rc7-next-20190222 #41 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:put_page_testzero include/linux/mm.h:579 [inline] RIP: 0010:put_page include/linux/mm.h:1025 [inline] RIP: 0010:generic_pipe_buf_release+0x120/0x160 fs/pipe.c:224 Code: bd ff 4c 89 e7 e8 60 44 db ff e8 9b 28 bd ff 5b 41 5c 41 5d 5d c3 e8 8f 28 bd ff 48 c7 c6 e0 97 75 87 4c 89 e7 e8 90 dc e4 ff <0f> 0b e8 79 28 bd ff 4d 8d 65 ff e9 3d ff ff ff 48 89 df e8 58 f9 RSP: 0018:ffff8880a1bd7920 EFLAGS: 00010293 RAX: ffff8880879483c0 RBX: ffffea00029574f4 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81981a22 RDI: ffffea00029574f8 RBP: ffff8880a1bd7938 R08: 000000000000003e R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00029574c0 R13: 0000000000000000 R14: ffff88808d5c3580 R15: ffff8880a47f36c0 FS: 000000000107d880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043e580 CR3: 000000008d548000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pipe_buf_release include/linux/pipe_fs_i.h:129 [inline] iter_file_splice_write+0x7d1/0xbe0 fs/splice.c:759 do_splice_from fs/splice.c:847 [inline] direct_splice_actor+0x126/0x1a0 fs/splice.c:1019 splice_direct_to_actor+0x369/0x970 fs/splice.c:974 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062 do_sendfile+0x597/0xd00 fs/read_write.c:1442 __do_sys_sendfile64 fs/read_write.c:1503 [inline] __se_sys_sendfile64 fs/read_write.c:1489 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1489 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x443d49 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff2d255148 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d49 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 R10: 0000000102000000 R11: 0000000000000246 R12: 0000000000401a50 R13: 0000000000401ae0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 8d0406376aea898a ]--- RIP: 0010:put_page_testzero include/linux/mm.h:579 [inline] RIP: 0010:put_page include/linux/mm.h:1025 [inline] RIP: 0010:generic_pipe_buf_release+0x120/0x160 fs/pipe.c:224 Code: bd ff 4c 89 e7 e8 60 44 db ff e8 9b 28 bd ff 5b 41 5c 41 5d 5d c3 e8 8f 28 bd ff 48 c7 c6 e0 97 75 87 4c 89 e7 e8 90 dc e4 ff <0f> 0b e8 79 28 bd ff 4d 8d 65 ff e9 3d ff ff ff 48 89 df e8 58 f9 RSP: 0018:ffff8880a1bd7920 EFLAGS: 00010293 RAX: ffff8880879483c0 RBX: ffffea00029574f4 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81981a22 RDI: ffffea00029574f8 RBP: ffff8880a1bd7938 R08: 000000000000003e R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00029574c0 R13: 0000000000000000 R14: ffff88808d5c3580 R15: ffff8880a47f36c0 FS: 000000000107d880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043e580 CR3: 000000008d548000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400