bisecting fixing commit since 58b454ebf81e5ae9391957d99cf89566d9eec1b1 building syzkaller on b0e8efcb4b0aac61f4647a76bbe54a5d38a370ba testing commit 58b454ebf81e5ae9391957d99cf89566d9eec1b1 with gcc (GCC) 8.1.0 kernel signature: 843c80e44777e45b5639d3e2c1b50a420325bfc51a0dff6d6fa97d1409fc67a9 all runs: crashed: WARNING in dma_buf_vunmap testing current HEAD 050272a0423e68207fd2367831ae610680129062 testing commit 050272a0423e68207fd2367831ae610680129062 with gcc (GCC) 8.1.0 kernel signature: 476a3595bd40d2de63527b1b3bb5ed0f1b1bbb86dd5bec9b48f12508bea3a5cf run #0: crashed: WARNING in dma_buf_vunmap run #1: crashed: WARNING in dma_buf_vunmap run #2: crashed: WARNING in dma_buf_vunmap run #3: crashed: WARNING in dma_buf_vunmap run #4: crashed: WARNING in corrupted run #5: crashed: WARNING in dma_buf_vunmap run #6: crashed: WARNING in dma_buf_vunmap run #7: crashed: WARNING in dma_buf_vunmap run #8: crashed: WARNING in dma_buf_vunmap run #9: crashed: WARNING in dma_buf_vunmap revisions tested: 2, total time: 24m41.366949356s (build: 17m9.645593945s, test: 6m32.22620747s) the crash still happens on HEAD commit msg: Linux 4.14.177 crash: WARNING in dma_buf_vunmap IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready ------------[ cut here ]------------ IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready WARNING: CPU: 1 PID: 6972 at drivers/dma-buf/dma-buf.c:1039 dma_buf_vunmap+0x154/0x1b0 drivers/dma-buf/dma-buf.c:1053 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 6972 Comm: syz-executor.0 Not tainted 4.14.177-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 panic+0x1b0/0x36a kernel/panic.c:183 __warn.cold.8+0x25/0x2a kernel/panic.c:547 report_bug+0x1a4/0x1f3 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295 IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:dma_buf_vunmap+0x154/0x1b0 drivers/dma-buf/dma-buf.c:1039 RSP: 0018:ffff88808302fbd0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888095b90900 RCX: 1ffff1104304cca7 RDX: 1ffff11012b72128 RSI: ffffc90005a2f000 RDI: 0000000000000000 RBP: ffff88808302fbf8 R08: ffff888094618f10 R09: 0000000000000caf R10: ffff88808302fce8 R11: ffff888094618640 R12: ffffffff84260250 R13: ffff88809510ea00 R14: ffff88809510ea28 R15: ffff888095b90900 vb2_vmalloc_detach_dmabuf+0x4f/0x80 drivers/media/v4l2-core/videobuf2-vmalloc.c:407 __vb2_plane_dmabuf_put.isra.6+0xff/0x2d0 drivers/media/v4l2-core/videobuf2-core.c:273 __vb2_buf_dmabuf_put drivers/media/v4l2-core/videobuf2-core.c:289 [inline] __vb2_free_mem drivers/media/v4l2-core/videobuf2-core.c:411 [inline] __vb2_queue_free+0x55c/0x770 drivers/media/v4l2-core/videobuf2-core.c:454 vb2_core_queue_release+0x57/0x70 drivers/media/v4l2-core/videobuf2-core.c:2043 vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline] _vb2_fop_release+0x1ac/0x280 drivers/media/v4l2-core/videobuf2-v4l2.c:840 vb2_fop_release+0x66/0xd0 drivers/media/v4l2-core/videobuf2-v4l2.c:854 vivid_fop_release+0x15f/0x3a0 drivers/media/platform/vivid/vivid-core.c:486 v4l2_release+0xee/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:446 __fput+0x235/0x750 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xeb/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x16a/0x1b0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x418/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4129e1 RSP: 002b:00007ffd1bafed60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004129e1 RDX: 0000001b30c20000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000740518 R08: 000000000000b321 R09: 000000000000b321 R10: 00007ffd1bafee30 R11: 0000000000000293 R12: 0000000000000001 R13: 000000000000b32b R14: 000000000000b358 R15: 000000000073bf0c Kernel Offset: disabled Rebooting in 86400 seconds..