bisecting fixing commit since 58b454ebf81e5ae9391957d99cf89566d9eec1b1 building syzkaller on b0e8efcb4b0aac61f4647a76bbe54a5d38a370ba testing commit 58b454ebf81e5ae9391957d99cf89566d9eec1b1 with gcc (GCC) 8.1.0 kernel signature: 9a04c76c316fb171cd43fd6a803b016df55fa748 all runs: crashed: WARNING in dma_buf_vunmap testing current HEAD a844dc4c544291470aa69edbe2434b040794e269 testing commit a844dc4c544291470aa69edbe2434b040794e269 with gcc (GCC) 8.1.0 kernel signature: 79c6ff319f60e61c364737cab31c5037069d2713 all runs: crashed: WARNING in dma_buf_vunmap revisions tested: 2, total time: 22m38.002994645s (build: 15m30.572020944s, test: 6m33.371111007s) the crash still happens on HEAD commit msg: Linux 4.14.158 crash: WARNING in dma_buf_vunmap bond0: Enslaving bond_slave_1 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready ------------[ cut here ]------------ IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready WARNING: CPU: 1 PID: 7055 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: 7055 Comm: syz-executor.2 Not tainted 4.14.158-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): veth0_to_hsr: 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 IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready RIP: 0010:dma_buf_vunmap+0x154/0x1b0 drivers/dma-buf/dma-buf.c:1039 RSP: 0018:ffff888099427bd0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88809286f380 RCX: 1ffff11013e54ca7 RDX: 1ffff1101250de78 RSI: ffffc90005ef4000 RDI: 0000000000000000 RBP: ffff888099427bf8 R08: ffff88808f71af08 R09: 00000000000023d2 R10: ffff888099427ce8 R11: ffff88808f71a640 R12: ffffffff84254c10 R13: ffff8880929b1500 R14: ffff8880929b1528 R15: ffff88809286f380 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 IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready 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 kobject: 'veth0_to_team' (ffff888090b2ea70): kobject_add_internal: parent: 'net', set: 'devices' vb2_fop_release+0x66/0xd0 drivers/media/v4l2-core/videobuf2-v4l2.c:854 kobject: 'veth0_to_team' (ffff888090b2ea70): kobject_uevent_env 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 kobject: 'veth0_to_team' (ffff888090b2ea70): fill_kobj_path: path = '/devices/virtual/net/veth0_to_team' 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:00007ffeceadf8b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004129e1 kobject: 'queues' (ffff8880a04af248): kobject_add_internal: parent: 'veth0_to_team', set: '' RDX: 0000001b32720000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000740518 R08: 000000000000e4f6 R09: 000000000000e4f6 R10: 00007ffeceadf980 R11: 0000000000000293 R12: 0000000000000001 R13: 000000000000e4f7 R14: 000000000000e524 R15: 000000000073bf0c Kernel Offset: disabled Rebooting in 86400 seconds..