FYI, we noticed the below changes on https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.lookups commit fda89e65743179d09e55bc6c265d06fa5efa8803 ("namei: untanlge lookup_fast()") +------------------------------------------+------------+------------+ | | 6c51e513a3 | fda89e6574 | +------------------------------------------+------------+------------+ | boot_successes | 0 | 1 | | boot_failures | 1 | 4 | | invoked_oom-killer:gfp_mask=0x | 1 | 1 | | Mem-Info | 1 | 1 | | Out_of_memory:Kill_process | 1 | 1 | | kernel_BUG_at_fs/namei.c | 0 | 3 | | invalid_opcode:#[##]SMP | 0 | 3 | | RIP:unlazy_walk | 0 | 3 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 3 | | backtrace:SYSC_newfstatat | 0 | 3 | | backtrace:SyS_newfstatat | 0 | 3 | +------------------------------------------+------------+------------+ [ 19.082726] gre: GRE over IPv4 demultiplexor driver [ 19.084132] PPTP driver version 0.8.5 [ 19.622035] ------------[ cut here ]------------ [ 19.623051] kernel BUG at fs/namei.c:679! [ 19.624142] invalid opcode: 0000 [#1] SMP [ 19.625196] Modules linked in: pptp gre nfnetlink scsi_transport_iscsi pppoe inet_diag crypto_user sctp vmw_vsock_vmci_transport vsock vmw_vmci ieee802154_socket ieee802154 pppox ppp_generic slhc atm rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod cdrom ata_generic pata_acpi snd_pcm ppdev snd_timer snd soundcore pcspkr serio_raw ata_piix parport_pc parport floppy acpi_cpufreq libata i2c_piix4 [ 19.634478] CPU: 2 PID: 471 Comm: trinity-main Not tainted 4.5.0-rc4-00017-gfda89e6 #1 [ 19.636222] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 19.638068] task: ffff88007e49a440 ti: ffff88007ecfc000 task.ti: ffff88007ecfc000 [ 19.639728] RIP: 0010:[] [] unlazy_walk+0x151/0x170 [ 19.641705] RSP: 0018:ffff88007ecffc30 EFLAGS: 00010246 [ 19.643337] RAX: 0000000000001000 RBX: ffff88007ecffd40 RCX: ffff88007ecffcc4 [ 19.644713] RDX: 0000000000000002 RSI: ffff8800a486a240 RDI: ffff88007ecffd40 [ 19.646082] RBP: ffff88007ecffc58 R08: 0000000000000001 R09: 0000000000200000 [ 19.647451] R10: ffffffffffffffff R11: 0000000b5ae0aec3 R12: ffff8800a486a240 [ 19.648820] R13: ffff8800a486a480 R14: ffff88007ecffcc8 R15: ffff88013a53aaa0 [ 19.650323] FS: 00007f1ba2185700(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000 [ 19.652545] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.654211] CR2: 000000000239b000 CR3: 000000007f654000 CR4: 00000000000006e0 [ 19.656138] Stack: [ 19.657186] ffff88007ecffd40 ffff8800a486a240 ffff88007ecffcd0 ffff88007ecffcc8 [ 19.660359] ffff88013a53aaa0 ffff88007ecffcb0 ffffffff811fc937 ffff88007ecffcc4 [ 19.663448] ffff88007ecffcc4 ffff88007ecffcc4 0000000280808080 ffff88007ecffd40 [ 19.666064] Call Trace: [ 19.666835] [] lookup_fast+0x157/0x330 [ 19.667898] [] walk_component+0x3a/0x410 [ 19.668968] [] path_lookupat+0x5d/0x110 [ 19.670047] [] filename_lookup+0x9e/0x150 [ 19.671163] [] ? __might_sleep+0x49/0x80 [ 19.672276] [] ? getname_flags+0x56/0x1f0 [ 19.673370] [] ? kmem_cache_alloc+0x18e/0x1f0 [ 19.674545] [] ? getname_flags+0x56/0x1f0 [ 19.675665] [] ? getname_flags+0x72/0x1f0 [ 19.676755] [] user_path_at_empty+0x36/0x40 [ 19.677859] [] vfs_fstatat+0x53/0xa0 [ 19.678902] [] SYSC_newfstatat+0x15/0x30 [ 19.679998] [] SyS_newfstatat+0xe/0x10 [ 19.681087] [] entry_SYSCALL_64_fastpath+0x12/0x6d [ 19.682253] Code: 00 41 8b 7e 40 49 8d 76 20 e8 6c fe ff ff 84 c0 75 ba 48 89 df 65 ff 0d a6 f5 e0 7e e8 69 cb 00 00 b8 f6 ff ff ff e9 53 ff ff ff <0f> 0b 48 89 df 65 ff 0d 8b f5 e0 7e e8 4e cb 00 00 e9 29 ff ff [ 19.690108] RIP [] unlazy_walk+0x151/0x170 [ 19.691269] RSP [ 19.692149] ---[ end trace 563d316f4eb96ab1 ]--- [ 19.693134] Kernel panic - not syncing: Fatal exception To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Kernel Test Robot