Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is https://github.com/0day-ci/linux Deepa-Dinamani/Delete-CURRENT_TIME-and-CURRENT_TIME_SEC-macros/20160620-104147 commit c43edc7bd9c06af9a7278101d462eb0ba0299605 Author: Deepa Dinamani <deepa.kernel(a)gmail.com&gt; AuthorDate: Sun Jun 19 17:27:01 2016 -0700 Commit: 0day robot <fengguang.wu(a)intel.com&gt; CommitDate: Mon Jun 20 10:41:55 2016 +0800 fs: Replace CURRENT_TIME with current_time() for inode timestamps CURRENT_TIME macro is not appropriate for filesystems as it doesn't use the right granularity for filesystem timestamps. Use current_time() instead. CURRENT_TIME is also not y2038 safe. This is also in preparation for the patch that transitions vfs timestamps to use 64 bit time and hence make them y2038 safe. As part of the effort current_time() will be extended to do range checks. Hence, it is necessary for all file system timestamps to use current_time(). Also, current_time() will be transitioned along with vfs to be y2038 safe. Note that whenever a single call to current_time() is used to change timestamps in different inodes, it is because they share the same time granularity. Signed-off-by: Deepa Dinamani <deepa.kernel(a)gmail.com&gt; Acked-by: Felipe Balbi <balbi(a)kernel.org&gt; Acked-by: Steven Whitehouse <swhiteho(a)redhat.com&gt; Acked-by: Ryusuke Konishi <konishi.ryusuke(a)lab.ntt.co.jp&gt; Reviewed-by: David Sterba <dsterba(a)suse.com&gt; +------------------------------------------+------------+------------+------------+ | | 58b11bff28 | c43edc7bd9 | ac5a28d43c | +------------------------------------------+------------+------------+------------+ | boot_successes | 63 | 0 | 0 | | boot_failures | 0 | 22 | 13 | | BUG:unable_to_handle_kernel | 0 | 22 | 13 | | Oops | 0 | 22 | 13 | | EIP_is_at_current_time | 0 | 22 | 13 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 22 | 13 | | backtrace:_do_fork | 0 | 22 | 13 | +------------------------------------------+------------+------------+------------+ member access within null pointer of type 'struct super_block' CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0-rc3-next-20160617-00002-gc43edc7 #1 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0-rc3-next-20160617-00002-gc43edc7 #1 00000000 00000000 00000000 00000000 81badd80 81badd80 812d44fa 812d44fa 00000001 00000001 81badda0 81badda0 2cb434b2 2cb434b2 81badd8c 81badd8c 8131d947 8131d947 81cab780 81cab780 81baddac 81baddac 8131dd3d 8131dd3d 81b08fa2 81b08fa2 81b09277 81b09277 81cacd80 81cacd80 00200202 00200202 00000000 00000000 2cb434b2 2cb434b2 81baddcc 81baddcc 811b0dc6 811b0dc6 57677728 57677728 00000000 00000000 2cb434b2 2cb434b2 8f414008 8f414008 Call Trace: Call Trace: [<812d44fa>] dump_stack+0x57/0x79 [<812d44fa>] dump_stack+0x57/0x79 [<8131d947>] ubsan_epilogue+0xb/0x33 [<8131d947>] ubsan_epilogue+0xb/0x33 [<8131dd3d>] __ubsan_handle_type_mismatch+0x47/0xfb [<8131dd3d>] __ubsan_handle_type_mismatch+0x47/0xfb [<811b0dc6>] current_time+0x3c/0x53 [<811b0dc6>] current_time+0x3c/0x53 [<811e6982>] proc_alloc_inode+0x66/0x84 [<811e6982>] proc_alloc_inode+0x66/0x84 [<811ae68e>] alloc_inode+0x34/0x9f [<811ae68e>] alloc_inode+0x34/0x9f [<811af51a>] new_inode_pseudo+0xb/0x58 [<811af51a>] new_inode_pseudo+0xb/0x58 [<811e6c49>] proc_get_inode+0xd/0x10d [<811e6c49>] proc_get_inode+0xd/0x10d [<811e6d9c>] proc_fill_super+0x53/0x93 [<811e6d9c>] proc_fill_super+0x53/0x93 [<811e7006>] proc_mount+0xb3/0xee [<811e7006>] proc_mount+0xb3/0xee [<81196fb2>] mount_fs+0x48/0xcf [<81196fb2>] mount_fs+0x48/0xcf [<811b54f6>] vfs_kern_mount+0x4c/0x131 [<811b54f6>] vfs_kern_mount+0x4c/0x131 [<811b8609>] kern_mount_data+0x28/0x54 [<811b8609>] kern_mount_data+0x28/0x54 [<811e7160>] pid_ns_prepare_proc+0x13/0x35 [<811e7160>] pid_ns_prepare_proc+0x13/0x35 [<81069afc>] alloc_pid+0x358/0x4a2 [<81069afc>] alloc_pid+0x358/0x4a2 [<8104a72a>] copy_process+0x1297/0x1ba9 [<8104a72a>] copy_process+0x1297/0x1ba9 [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<8104b253>] _do_fork+0xcf/0x4eb [<8104b253>] _do_fork+0xcf/0x4eb [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<812ed0b6>] ? find_next_bit+0x12/0x1c [<812ed0b6>] ? find_next_bit+0x12/0x1c [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<8104b68b>] kernel_thread+0x1c/0x21 [<8104b68b>] kernel_thread+0x1c/0x21 [<81847535>] rest_init+0x1a/0xa1 [<81847535>] rest_init+0x1a/0xa1 [<8209ee76>] start_kernel+0x3ca/0x3d2 [<8209ee76>] start_kernel+0x3ca/0x3d2 [<8209e2e4>] i386_start_kernel+0xab/0xaf [<8209e2e4>] i386_start_kernel+0xab/0xaf ================================================================================ ================================================================================ BUG: unable to handle kernel BUG: unable to handle kernel NULL pointer dereferenceNULL pointer dereference at 00000470 at 00000470 IP:IP: [<811b0dc6>] current_time+0x3c/0x53 [<811b0dc6>] current_time+0x3c/0x53 *pde = 00000000 *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0-rc3-next-20160617-00002-gc43edc7 #1 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0-rc3-next-20160617-00002-gc43edc7 #1 task: 81bb1c00 ti: 81bac000 task.ti: 81bac000 task: 81bb1c00 ti: 81bac000 task.ti: 81bac000 EIP: 0060:[<811b0dc6>] EFLAGS: 00210296 CPU: 0 EIP: 0060:[<811b0dc6>] EFLAGS: 00210296 CPU: 0 EIP is at current_time+0x3c/0x53 EIP is at current_time+0x3c/0x53 EAX: 81b08e52 EBX: 00000000 ECX: 2544e35b EDX: 331b7b49 EAX: 81b08e52 EBX: 00000000 ECX: 2544e35b EDX: 331b7b49 ESI: 2cb434b2 EDI: 57677728 EBP: 81baddcc ESP: 81baddb4 ESI: 2cb434b2 EDI: 57677728 EBP: 81baddcc ESP: 81baddb4 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 CR0: 80050033 CR2: 00000470 CR3: 02159000 CR4: 00040690 CR0: 80050033 CR2: 00000470 CR3: 02159000 CR4: 00040690 Stack: Stack: 57677728 57677728 00000000 00000000 2cb434b2 2cb434b2 8f414008 8f414008 8f414024 8f414024 8008e8a8 8008e8a8 81badddc 81badddc 811e6982 811e6982 81862240 81862240 8008e8a8 8008e8a8 81baddec 81baddec 811ae68e 811ae68e 8008e8a8 8008e8a8 81ccbb80 81ccbb80 81bade00 81bade00 811af51a 811af51a 2544e35b 2544e35b 8008e8a8 8008e8a8 81ccbb80 81ccbb80 81bade14 81bade14 811e6c49 811e6c49 8008e8a8 8008e8a8 81bf5ca0 81bf5ca0 8008e8a8 8008e8a8 Call Trace: Call Trace: [<811e6982>] proc_alloc_inode+0x66/0x84 [<811e6982>] proc_alloc_inode+0x66/0x84 [<811ae68e>] alloc_inode+0x34/0x9f [<811ae68e>] alloc_inode+0x34/0x9f [<811af51a>] new_inode_pseudo+0xb/0x58 [<811af51a>] new_inode_pseudo+0xb/0x58 [<811e6c49>] proc_get_inode+0xd/0x10d [<811e6c49>] proc_get_inode+0xd/0x10d [<811e6d9c>] proc_fill_super+0x53/0x93 [<811e6d9c>] proc_fill_super+0x53/0x93 [<811e7006>] proc_mount+0xb3/0xee [<811e7006>] proc_mount+0xb3/0xee [<81196fb2>] mount_fs+0x48/0xcf [<81196fb2>] mount_fs+0x48/0xcf [<811b54f6>] vfs_kern_mount+0x4c/0x131 [<811b54f6>] vfs_kern_mount+0x4c/0x131 [<811b8609>] kern_mount_data+0x28/0x54 [<811b8609>] kern_mount_data+0x28/0x54 [<811e7160>] pid_ns_prepare_proc+0x13/0x35 [<811e7160>] pid_ns_prepare_proc+0x13/0x35 [<81069afc>] alloc_pid+0x358/0x4a2 [<81069afc>] alloc_pid+0x358/0x4a2 [<8104a72a>] copy_process+0x1297/0x1ba9 [<8104a72a>] copy_process+0x1297/0x1ba9 [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<8104b253>] _do_fork+0xcf/0x4eb [<8104b253>] _do_fork+0xcf/0x4eb [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<812ed0b6>] ? find_next_bit+0x12/0x1c [<812ed0b6>] ? find_next_bit+0x12/0x1c [<818475bc>] ? rest_init+0xa1/0xa1 [<818475bc>] ? rest_init+0xa1/0xa1 [<8104b68b>] kernel_thread+0x1c/0x21 [<8104b68b>] kernel_thread+0x1c/0x21 [<81847535>] rest_init+0x1a/0xa1 [<81847535>] rest_init+0x1a/0xa1 [<8209ee76>] start_kernel+0x3ca/0x3d2 [<8209ee76>] start_kernel+0x3ca/0x3d2 [<8209e2e4>] i386_start_kernel+0xab/0xaf [<8209e2e4>] i386_start_kernel+0xab/0xaf Code:Code: f1 f1 ff ff 8b 8b 75 75 f0 f0 8b 8b 7d 7d e8 e8 85 85 db db 75 75 0c 0c 31 31 d2 d2 b8 b8 98 98 b7 b7 ca ca 81 81 e8 e8 43 43 cf cf 16 16 00 00 8b 8b 5b 5b 1c 1c 85 85 db db 75 75 0c 0c 31 31 d2 d2 b8 b8 80 80 b7 b7 ca ca 81 81 e8 e8 30 30 cf cf 16 16 00 00 <8b> <8b> 8b 8b 70 70 04 04 00 00 00 00 89 89 f8 f8 89 89 f2 f2 e8 e8 7c 7c ac ac f0 f0 ff ff 83 83 c4 c4 0c 0c 5b 5b 5e 5e 5f 5f EIP: [<811b0dc6>] EIP: [<811b0dc6>] current_time+0x3c/0x53current_time+0x3c/0x53 SS:ESP 0068:81baddb4 SS:ESP 0068:81baddb4 CR2: 0000000000000470 CR2: 0000000000000470 ---[ end trace 4d5ff9f2f68c4233 ]--- ---[ end trace 4d5ff9f2f68c4233 ]--- git bisect start ac5a28d43cc9c23525d92173bd64212d81295b09 ce24ed9ec7532bc79485f23dff59923c0271f6d3 -- git bisect bad b49866cd5401e20ee939655995b184f92ffa537e # 12:39 0- 20 fs: cifs: Replace CURRENT_TIME by get_seconds git bisect bad 893073fb0993c3e3256e64b903bac8a103740c5d # 12:42 0- 22 fs: ext4: Use current_time() for inode timestamps git bisect bad 553d024a5815863d83fa871537609883d5e4bb38 # 12:46 0- 22 fs: Replace CURRENT_TIME_SEC with current_time() for inode timestamps git bisect good 58b11bff2839a01a08ff325c5afd51a3c01c77a8 # 12:52 22+ 0 vfs: Add current_time() api git bisect bad c43edc7bd9c06af9a7278101d462eb0ba0299605 # 12:55 0- 6 fs: Replace CURRENT_TIME with current_time() for inode timestamps # first bad commit: [c43edc7bd9c06af9a7278101d462eb0ba0299605] fs: Replace CURRENT_TIME with current_time() for inode timestamps git bisect good 58b11bff2839a01a08ff325c5afd51a3c01c77a8 # 12:57 63+ 0 vfs: Add current_time() api # extra tests with CONFIG_DEBUG_INFO_REDUCED git bisect bad c43edc7bd9c06af9a7278101d462eb0ba0299605 # 13:04 0- 52 fs: Replace CURRENT_TIME with current_time() for inode timestamps # extra tests on HEAD of linux-review/Deepa-Dinamani/Delete-CURRENT_TIME-and-CURRENT_TIME_SEC-macros/20160620-104147 git bisect bad ac5a28d43cc9c23525d92173bd64212d81295b09 # 13:04 0- 13 time: Delete current_fs_time() function # extra tests on tree/branch linux-review/Deepa-Dinamani/Delete-CURRENT_TIME-and-CURRENT_TIME_SEC-macros/20160620-104147 git bisect bad ac5a28d43cc9c23525d92173bd64212d81295b09 # 13:04 0- 13 time: Delete current_fs_time() function # extra tests with first bad commit reverted # extra tests on tree/branch linus/master git bisect good c3695331f3a326a468bd6a5b6f05b481b399726b # 14:09 66+ 1 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs # extra tests on tree/branch linux-next/master git bisect good ce24ed9ec7532bc79485f23dff59923c0271f6d3 # 14:13 64+ 0 Add linux-next specific files for 20160617 This script may reproduce the error. ---------------------------------------------------------------------------- #!/bin/bash kernel=$1 kvm=( qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel $kernel -m 256 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation