R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ------------[ cut here ]------------ WARNING: drivers/dma-buf/dma-buf.c:1528 at dma_buf_vmap+0x41b/0x480 drivers/dma-buf/dma-buf.c:1528, CPU#0: syz.0.1694/13066 Modules linked in: CPU: 0 UID: 0 PID: 13066 Comm: syz.0.1694 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:dma_buf_vmap+0x41b/0x480 drivers/dma-buf/dma-buf.c:1528 Code: fc e9 94 fd ff ff 48 8b 3c 24 e8 90 22 21 fc e9 26 ff ff ff e8 f6 43 b8 fb 90 0f 0b e8 ee 43 b8 fb 90 0f 0b e8 e6 43 b8 fb 90 <0f> 0b 90 e9 25 fe ff ff 4c 89 f7 e8 a5 21 21 fc e9 82 fd ff ff e8 RSP: 0018:ffffc9000e0473a0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8880556b0400 RCX: ffffffff860625ad RDX: ffff88802330c980 RSI: ffffffff860626fa RDI: 0000000000000005 RBP: ffffc9000e047448 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000fffffff4 R11: 0000000000000000 R12: ffff8880556b00d0 R13: 1ffff92001c08e78 R14: ffff8880556b0430 R15: 00000000fffffff4 FS: 0000000000000000(0000) GS:ffff8880976fc000(0063) knlGS:00000000f54e6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f54e5fac CR3: 000000005480d000 CR4: 0000000000352ef0 Call Trace: drm_gem_shmem_vmap_locked+0x10f/0x7e0 drivers/gpu/drm/drm_gem_shmem_helper.c:394 drm_gem_vmap_locked+0xc8/0x1c0 drivers/gpu/drm/drm_gem.c:1273 drm_gem_vmap+0x4a/0xa0 drivers/gpu/drm/drm_gem.c:1315 drm_gem_fb_vmap+0xc7/0x4d0 drivers/gpu/drm/drm_gem_framebuffer_helper.c:369 vkms_prepare_fb+0x87/0xb0 drivers/gpu/drm/vkms/vkms_plane.c:197 drm_atomic_helper_prepare_planes drivers/gpu/drm/drm_atomic_helper.c:2762 [inline] drm_atomic_helper_prepare_planes+0x1ef/0xbb0 drivers/gpu/drm/drm_atomic_helper.c:2738 drm_atomic_helper_commit+0x191/0x380 drivers/gpu/drm/drm_atomic_helper.c:2191 drm_atomic_commit+0x234/0x300 drivers/gpu/drm/drm_atomic.c:1743 drm_atomic_helper_update_plane+0x30b/0x400 drivers/gpu/drm/drm_atomic_helper.c:3362 __setplane_atomic+0x25a/0x380 drivers/gpu/drm/drm_plane.c:1101 drm_mode_cursor_universal+0x4a6/0xcb0 drivers/gpu/drm/drm_plane.c:1256 drm_mode_cursor_common+0x308/0x960 drivers/gpu/drm/drm_plane.c:1315 drm_mode_cursor_ioctl+0xd1/0x110 drivers/gpu/drm/drm_plane.c:1365 drm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:804 drm_ioctl+0x5c9/0xc30 drivers/gpu/drm/drm_ioctl.c:901 drm_compat_ioctl+0x327/0x460 drivers/gpu/drm/drm_ioc32.c:379 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7ff7579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f54e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000c01c64a3 RDX: 0000000080000280 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi