Hi, Boot of mainline kernel is currently broken. On commit 7d3bf613e99abbd96ac7b90ee3694a246c975021. Config: https://gist.githubusercontent.com/dvyukov/9f7f1fd9e477efd85b221b3a21036c20/raw/7c56ede0840494b26045976960866f2b265c6f64/gistfile1.txt Should have been introduced very recently. You may need to also patch "umh: fix race condition", because that's another boot crasher currently present in tree. ================================================================== BUG: KASAN: use-after-free in blk_flush_complete_seq+0xfde/0x1810 block/blk-flush.c:215 Read of size 4 at addr ffff880063f876d4 by task swapper/2/0 CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.17.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1a7/0x275 lib/dump_stack.c:113 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 blk_flush_complete_seq+0xfde/0x1810 block/blk-flush.c:215 flush_end_io+0x523/0xb50 block/blk-flush.c:257 blk_finish_request+0x3fa/0x6a0 block/blk-core.c:3209 scsi_end_request+0x3d3/0x820 drivers/scsi/scsi_lib.c:715 scsi_io_completion+0x1869/0x1910 drivers/scsi/scsi_lib.c:898 scsi_finish_command+0x4de/0x8d0 drivers/scsi/scsi.c:248 scsi_softirq_done+0x3ad/0x4b0 drivers/scsi/scsi_lib.c:1683 blk_done_softirq+0x48c/0x700 block/blk-softirq.c:37 __do_softirq+0x2e0/0xb94 kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x1cc/0x200 kernel/softirq.c:404 exiting_irq arch/x86/include/asm/apic.h:525 [inline] do_IRQ+0xf1/0x190 arch/x86/kernel/irq.c:257 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642 </IRQ> RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 Code: 48 89 df e8 5c 88 a3 fa e9 51 ff ff ff 4c 89 ef e8 4f 88 a3 fa eb 9b 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 RSP: 0000:ffff88006bdcfc38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffde RAX: dffffc0000000000 RBX: 1ffff1000d7b9f8a RCX: 0000000000000000 RDX: 1ffffffff10e2b78 RSI: 0000000000000001 RDI: ffffffff88715bc0 RBP: ffff88006bdcfc38 R08: ffffed000d9246d7 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 R13: ffff88006bdcfcf0 R14: 0000000000000000 R15: ffffffff88715bb0 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xbf/0x440 arch/x86/kernel/process.c:500 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491 default_idle_call+0x36/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x345/0x560 kernel/sched/idle.c:262 cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:368 start_secondary+0x42b/0x5b0 arch/x86/kernel/smpboot.c:265 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 Allocated by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:555 [inline] alloc_request_size+0x80/0x120 block/blk-core.c:844 mempool_alloc+0x16c/0x4b0 mm/mempool.c:384 __get_request block/blk-core.c:1424 [inline] get_request+0xe04/0x2480 block/blk-core.c:1535 blk_queue_bio+0x5e9/0x1980 block/blk-core.c:2054 generic_make_request+0x919/0x1540 block/blk-core.c:2447 submit_bio+0x19a/0x4d0 block/blk-core.c:2555 submit_bio_wait+0x137/0x1e0 block/bio.c:977 blkdev_issue_flush+0x204/0x2f0 block/blk-flush.c:551 jbd2_journal_recover+0x3f3/0x4b0 fs/jbd2/recovery.c:289 jbd2_journal_load+0x256/0xca0 fs/jbd2/journal.c:1686 ext4_load_journal fs/ext4/super.c:4704 [inline] ext4_fill_super+0x8e60/0xb700 fs/ext4/super.c:4076 mount_bdev+0x2ba/0x370 fs/super.c:1174 ext4_mount+0x34/0x40 fs/ext4/super.c:5771 mount_fs+0x6b/0x2d0 fs/super.c:1277 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2515 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0xea4/0x2bd0 fs/namespace.c:2848 ksys_mount+0xab/0x120 fs/namespace.c:3064 do_mount_root init/do_mounts.c:366 [inline] mount_block_root+0x381/0x685 init/do_mounts.c:395 mount_root+0x287/0x2bb init/do_mounts.c:540 prepare_namespace+0x1cf/0x20c init/do_mounts.c:599 kernel_init_freeable+0x53f/0x55d init/main.c:1154 kernel_init+0x13/0x180 init/main.c:1061 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Freed by task 0: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 free_request_size+0x5b/0x70 block/blk-core.c:859 mempool_free+0xda/0x350 mm/mempool.c:493 blk_free_request block/blk-core.c:1210 [inline] __blk_put_request+0x513/0xc70 block/blk-core.c:1768 blk_finish_request+0x349/0x6a0 block/blk-core.c:3214 __blk_end_bidi_request+0xeb/0x1e0 block/blk-core.c:3278 __blk_end_request_all+0x129/0x270 block/blk-core.c:3368 blk_flush_complete_seq+0xf92/0x1810 block/blk-flush.c:208 flush_end_io+0x523/0xb50 block/blk-flush.c:257 blk_finish_request+0x3fa/0x6a0 block/blk-core.c:3209 scsi_end_request+0x3d3/0x820 drivers/scsi/scsi_lib.c:715 scsi_io_completion+0x1869/0x1910 drivers/scsi/scsi_lib.c:898 scsi_finish_command+0x4de/0x8d0 drivers/scsi/scsi.c:248 scsi_softirq_done+0x3ad/0x4b0 drivers/scsi/scsi_lib.c:1683 blk_done_softirq+0x48c/0x700 block/blk-softirq.c:37 __do_softirq+0x2e0/0xb94 kernel/softirq.c:284 The buggy address belongs to the object at ffff880063f876c0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 20 bytes inside of 1024-byte region [ffff880063f876c0, ffff880063f87ac0) The buggy address belongs to the page: page:ffffea00018fe180 count:1 mapcount:0 mapping:ffff88006c400ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffffea00018fe108 ffff88006c401848 ffff88006c400ac0 raw: 0000000000000000 ffff880063f86040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880063f87580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880063f87600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff880063f87680: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff880063f87700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880063f87780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
