From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f198.google.com (mail-it1-f198.google.com [209.85.166.198]) by kanga.kvack.org (Postfix) with ESMTP id BFD3F8E005B for ; Mon, 31 Dec 2018 02:23:04 -0500 (EST) Received: by mail-it1-f198.google.com with SMTP id k133so31294269ite.4 for ; Sun, 30 Dec 2018 23:23:04 -0800 (PST) Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id e14sor11235605ioh.3.2018.12.30.23.23.03 for (Google Transport Security); Sun, 30 Dec 2018 23:23:03 -0800 (PST) MIME-Version: 1.0 Date: Sun, 30 Dec 2018 23:23:03 -0800 Message-ID: <0000000000008bc346057e4c4873@google.com> Subject: BUG: unable to handle kernel NULL pointer dereference in kmem_cache_free (2) From: syzbot Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, borntraeger@de.ibm.com, colin.king@canonical.com, jglisse@redhat.com, khalid.aziz@oracle.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mawilcox@microsoft.com, mgorman@techsingularity.net, mike.kravetz@oracle.com, n-horiguchi@ah.jp.nec.com, rppt@linux.vnet.ibm.com, syzkaller-bugs@googlegroups.com Hello, syzbot found the following crash on: HEAD commit: 345671ea0f92 Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10442713400000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c0a49d2b5210087 dashboard link: https://syzkaller.appspot.com/bug?extid=463e2f5d13fc785dd322 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+463e2f5d13fc785dd322@syzkaller.appspotmail.com FAT-fs (loop1): Directory bread(block 72) failed EXT4-fs (loop3): Can't read superblock on 2nd try FAT-fs (loop1): Directory bread(block 73) failed audit: type=1400 audit(1540684862.923:177): avc: denied { mmap_zero } for pid=17455 comm="udevd" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=memprotect permissive=1 BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 17455 Comm: udevd Not tainted 4.19.0+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:slab_equal_or_root mm/slab.h:228 [inline] RIP: 0010:cache_from_obj mm/slab.h:374 [inline] RIP: 0010:kmem_cache_free+0x120/0x290 mm/slab.c:3752 Code: ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 40 18 48 39 c3 0f 84 00 ff ff ff <48> 3b 98 80 00 00 00 0f 84 11 01 00 00 48 8b 48 58 48 c7 c6 20 0c RSP: 0018:ffff88018eb271d8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8801da979480 RCX: ffffea0007658e87 RDX: 0000000000000000 RSI: ffffffff8139ec96 RDI: 0000000000000007 RBP: ffff88018eb271f8 R08: ffff88018e3f03c0 R09: ffffed003914bb50 R10: ffffed003914bb50 R11: ffff8801c8a5da83 R12: ffff8801d963ab10 R13: ffff8801b37755a0 R14: ffff8801b37755a0 R15: ffff8801b3775590 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000001c0bd1000 CR4: 00000000001426e0 Call Trace: anon_vma_chain_free mm/rmap.c:134 [inline] unlink_anon_vmas+0x5f0/0xa60 mm/rmap.c:419 free_pgtables+0x271/0x380 mm/memory.c:393 exit_mmap+0x2cd/0x590 mm/mmap.c:3146 __mmput kernel/fork.c:1044 [inline] mmput+0x247/0x610 kernel/fork.c:1065 exec_mmap fs/exec.c:1043 [inline] flush_old_exec+0xb91/0x21b0 fs/exec.c:1276 load_elf_binary+0xa39/0x5620 fs/binfmt_elf.c:869 search_binary_handler+0x17d/0x570 fs/exec.c:1653 exec_binprm fs/exec.c:1695 [inline] __do_execve_file.isra.33+0x1661/0x25d0 fs/exec.c:1819 do_execveat_common fs/exec.c:1866 [inline] do_execve fs/exec.c:1883 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ffa0b953207 Code: Bad RIP value. RSP: 002b:00007ffefdbbcde8 EFLAGS: 00000206 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007ffa0b953207 RDX: 0000000000e42b70 RSI: 00007ffefdbbcee0 RDI: 00007ffefdbbdef0 RBP: 0000000000625500 R08: 000000000000405a R09: 000000000000405a R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000e42b70 R13: 0000000000000007 R14: 0000000000d40030 R15: 0000000000000005 Modules linked in: CR2: 0000000000000080 kobject: 'loop5' (00000000598b220f): kobject_uevent_env ---[ end trace fc838222524811c3 ]--- RIP: 0010:slab_equal_or_root mm/slab.h:228 [inline] RIP: 0010:cache_from_obj mm/slab.h:374 [inline] RIP: 0010:kmem_cache_free+0x120/0x290 mm/slab.c:3752 kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' Code: ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 40 18 48 39 c3 0f 84 00 ff ff ff <48> 3b 98 80 00 00 00 0f 84 11 01 00 00 48 8b 48 58 48 c7 c6 20 0c RSP: 0018:ffff88018eb271d8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8801da979480 RCX: ffffea0007658e87 kobject: 'loop1' (00000000606593e3): kobject_uevent_env kobject: 'loop2' (00000000a62421b8): kobject_uevent_env kobject: 'loop1' (00000000606593e3): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000a62421b8): fill_kobj_path: path = '/devices/virtual/block/loop2' RDX: 0000000000000000 RSI: ffffffff8139ec96 RDI: 0000000000000007 RBP: ffff88018eb271f8 R08: ffff88018e3f03c0 R09: ffffed003914bb50 R10: ffffed003914bb50 R11: ffff8801c8a5da83 R12: ffff8801d963ab10 R13: ffff8801b37755a0 R14: ffff8801b37755a0 R15: ffff8801b3775590 kasan: CONFIG_KASAN_INLINE enabled kobject: 'loop5' (00000000598b220f): kobject_uevent_env FS: 00007ffa0c26f7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 kasan: GPF could be caused by NULL-ptr deref or user memory access kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (00000000a62421b8): kobject_uevent_env general protection fault: 0000 [#2] PREEMPT SMP KASAN CPU: 1 PID: 16046 Comm: udevd Tainted: G D 4.19.0+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__anon_vma_interval_tree_insert mm/interval_tree.c:72 [inline] RIP: 0010:anon_vma_interval_tree_insert+0x179/0x370 mm/interval_tree.c:83 Code: 03 42 80 3c 3a 00 0f 85 7d 01 00 00 4d 8b 65 00 4d 85 e4 0f 84 a5 00 00 00 e8 b3 fc cf ff 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 75 01 00 00 4d 8b 6c 24 18 4c 89 f7 4c 89 ee RSP: 0018:ffff8801c3396c90 EFLAGS: 00010206 RAX: 000000000836b159 RBX: ffff8801d8a8eee0 RCX: ffffffff81af3d90 RDX: 0000000000000000 RSI: ffffffff81af3d0d RDI: 0000000041b58acb RBP: ffff8801c3396cd8 R08: ffff880183b76340 R09: 0000000000000000 R10: 00000000224b4293 R11: ffff880183b76340 R12: 0000000041b58ab3 R13: ffff8801d963dfc0 R14: 000000000000001f R15: dffffc0000000000 FS: 00007ffa0c26f7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000930004 CR3: 000000018800a000 CR4: 00000000001426e0 Call Trace: anon_vma_chain_link mm/rmap.c:144 [inline] anon_vma_clone+0x2f5/0x710 mm/rmap.c:279 anon_vma_fork+0xf4/0x820 mm/rmap.c:332 dup_mmap kernel/fork.c:539 [inline] dup_mm kernel/fork.c:1317 [inline] copy_mm kernel/fork.c:1372 [inline] copy_process+0x47cc/0x8770 kernel/fork.c:1916 _do_fork+0x1cb/0x11d0 kernel/fork.c:2213 __do_sys_clone kernel/fork.c:2320 [inline] __se_sys_clone kernel/fork.c:2314 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2314 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ffa0b952f46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007ffefdbbcd80 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffefdbbcd80 RCX: 00007ffa0b952f46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffefdbbcde0 R08: 0000000000003eae R09: 0000000000003eae R10: 00007ffa0c26fa70 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffefdbbcda0 R14: 0000000000000005 R15: 0000000000000005 Modules linked in: kobject: 'loop1' (00000000606593e3): kobject_uevent_env kobject: 'loop2' (00000000a62421b8): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000606593e3): fill_kobj_path: path = '/devices/virtual/block/loop1' EXT4-fs (loop5): Can't read superblock on 2nd try CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'loop4' (000000001ebc1bae): kobject_uevent_env kobject: 'loop4' (000000001ebc1bae): fill_kobj_path: path = '/devices/virtual/block/loop4' CR2: 00000000004ede98 CR3: 00000001c0bd1000 CR4: 00000000001426e0 FAT-fs (loop1): Directory bread(block 64) failed kobject: 'loop5' (00000000598b220f): kobject_uevent_env DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 EXT4-fs (loop2): Invalid log block size: 2949122 kobject: 'loop5' (00000000598b220f): kobject_uevent_env FAT-fs (loop1): Directory bread(block 65) failed kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 FAT-fs (loop1): Directory bread(block 66) failed kobject: 'loop2' (00000000a62421b8): kobject_uevent_env --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. 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[209.85.220.69]) by mx.google.com with SMTPS id e14sor11235605ioh.3.2018.12.30.23.23.03 for (Google Transport Security); Sun, 30 Dec 2018 23:23:03 -0800 (PST) Received-SPF: pass (google.com: domain of 318mpxakbaowgmnyozzsfoddwr.uccuzsigsfqcbhsbh.qca@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 318mpxakbaowgmnyozzsfoddwr.uccuzsigsfqcbhsbh.qca@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=318MpXAkbAOwgmnYOZZSfOddWR.UccUZSigSfQcbhSbh.Qca@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: ALg8bN6pmQIyJBpa5H5cg/snSRE4oDO2IHo0R3/TSUsFH/kRsClqtD6Fs2CySE92p/7VphCiC0rsaEOmuXt/jnYEh2mQTzTN5YjA MIME-Version: 1.0 X-Received: by 2002:a6b:794b:: with SMTP id j11mr13843727iop.0.1546240983283; Sun, 30 Dec 2018 23:23:03 -0800 (PST) Date: Sun, 30 Dec 2018 23:23:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008bc346057e4c4873@google.com> Subject: BUG: unable to handle kernel NULL pointer dereference in kmem_cache_free (2) From: syzbot To: akpm@linux-foundation.org, borntraeger@de.ibm.com, colin.king@canonical.com, jglisse@redhat.com, khalid.aziz@oracle.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mawilcox@microsoft.com, mgorman@techsingularity.net, mike.kravetz@oracle.com, n-horiguchi@ah.jp.nec.com, rppt@linux.vnet.ibm.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; delsp="yes"; format="flowed" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Message-ID: <20181231072303.VbC191Gu6lpA2tiTyOTMkUSCDiB63iknp3OmsZfx_JQ@z> Hello, syzbot found the following crash on: HEAD commit: 345671ea0f92 Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10442713400000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c0a49d2b5210087 dashboard link: https://syzkaller.appspot.com/bug?extid=463e2f5d13fc785dd322 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+463e2f5d13fc785dd322@syzkaller.appspotmail.com FAT-fs (loop1): Directory bread(block 72) failed EXT4-fs (loop3): Can't read superblock on 2nd try FAT-fs (loop1): Directory bread(block 73) failed audit: type=1400 audit(1540684862.923:177): avc: denied { mmap_zero } for pid=17455 comm="udevd" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=memprotect permissive=1 BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 17455 Comm: udevd Not tainted 4.19.0+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:slab_equal_or_root mm/slab.h:228 [inline] RIP: 0010:cache_from_obj mm/slab.h:374 [inline] RIP: 0010:kmem_cache_free+0x120/0x290 mm/slab.c:3752 Code: ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 40 18 48 39 c3 0f 84 00 ff ff ff <48> 3b 98 80 00 00 00 0f 84 11 01 00 00 48 8b 48 58 48 c7 c6 20 0c RSP: 0018:ffff88018eb271d8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8801da979480 RCX: ffffea0007658e87 RDX: 0000000000000000 RSI: ffffffff8139ec96 RDI: 0000000000000007 RBP: ffff88018eb271f8 R08: ffff88018e3f03c0 R09: ffffed003914bb50 R10: ffffed003914bb50 R11: ffff8801c8a5da83 R12: ffff8801d963ab10 R13: ffff8801b37755a0 R14: ffff8801b37755a0 R15: ffff8801b3775590 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000001c0bd1000 CR4: 00000000001426e0 Call Trace: anon_vma_chain_free mm/rmap.c:134 [inline] unlink_anon_vmas+0x5f0/0xa60 mm/rmap.c:419 free_pgtables+0x271/0x380 mm/memory.c:393 exit_mmap+0x2cd/0x590 mm/mmap.c:3146 __mmput kernel/fork.c:1044 [inline] mmput+0x247/0x610 kernel/fork.c:1065 exec_mmap fs/exec.c:1043 [inline] flush_old_exec+0xb91/0x21b0 fs/exec.c:1276 load_elf_binary+0xa39/0x5620 fs/binfmt_elf.c:869 search_binary_handler+0x17d/0x570 fs/exec.c:1653 exec_binprm fs/exec.c:1695 [inline] __do_execve_file.isra.33+0x1661/0x25d0 fs/exec.c:1819 do_execveat_common fs/exec.c:1866 [inline] do_execve fs/exec.c:1883 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ffa0b953207 Code: Bad RIP value. RSP: 002b:00007ffefdbbcde8 EFLAGS: 00000206 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007ffa0b953207 RDX: 0000000000e42b70 RSI: 00007ffefdbbcee0 RDI: 00007ffefdbbdef0 RBP: 0000000000625500 R08: 000000000000405a R09: 000000000000405a R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000e42b70 R13: 0000000000000007 R14: 0000000000d40030 R15: 0000000000000005 Modules linked in: CR2: 0000000000000080 kobject: 'loop5' (00000000598b220f): kobject_uevent_env ---[ end trace fc838222524811c3 ]--- RIP: 0010:slab_equal_or_root mm/slab.h:228 [inline] RIP: 0010:cache_from_obj mm/slab.h:374 [inline] RIP: 0010:kmem_cache_free+0x120/0x290 mm/slab.c:3752 kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' Code: ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 40 18 48 39 c3 0f 84 00 ff ff ff <48> 3b 98 80 00 00 00 0f 84 11 01 00 00 48 8b 48 58 48 c7 c6 20 0c RSP: 0018:ffff88018eb271d8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8801da979480 RCX: ffffea0007658e87 kobject: 'loop1' (00000000606593e3): kobject_uevent_env kobject: 'loop2' (00000000a62421b8): kobject_uevent_env kobject: 'loop1' (00000000606593e3): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000a62421b8): fill_kobj_path: path = '/devices/virtual/block/loop2' RDX: 0000000000000000 RSI: ffffffff8139ec96 RDI: 0000000000000007 RBP: ffff88018eb271f8 R08: ffff88018e3f03c0 R09: ffffed003914bb50 R10: ffffed003914bb50 R11: ffff8801c8a5da83 R12: ffff8801d963ab10 R13: ffff8801b37755a0 R14: ffff8801b37755a0 R15: ffff8801b3775590 kasan: CONFIG_KASAN_INLINE enabled kobject: 'loop5' (00000000598b220f): kobject_uevent_env FS: 00007ffa0c26f7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 kasan: GPF could be caused by NULL-ptr deref or user memory access kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (00000000a62421b8): kobject_uevent_env general protection fault: 0000 [#2] PREEMPT SMP KASAN CPU: 1 PID: 16046 Comm: udevd Tainted: G D 4.19.0+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__anon_vma_interval_tree_insert mm/interval_tree.c:72 [inline] RIP: 0010:anon_vma_interval_tree_insert+0x179/0x370 mm/interval_tree.c:83 Code: 03 42 80 3c 3a 00 0f 85 7d 01 00 00 4d 8b 65 00 4d 85 e4 0f 84 a5 00 00 00 e8 b3 fc cf ff 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 75 01 00 00 4d 8b 6c 24 18 4c 89 f7 4c 89 ee RSP: 0018:ffff8801c3396c90 EFLAGS: 00010206 RAX: 000000000836b159 RBX: ffff8801d8a8eee0 RCX: ffffffff81af3d90 RDX: 0000000000000000 RSI: ffffffff81af3d0d RDI: 0000000041b58acb RBP: ffff8801c3396cd8 R08: ffff880183b76340 R09: 0000000000000000 R10: 00000000224b4293 R11: ffff880183b76340 R12: 0000000041b58ab3 R13: ffff8801d963dfc0 R14: 000000000000001f R15: dffffc0000000000 FS: 00007ffa0c26f7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000930004 CR3: 000000018800a000 CR4: 00000000001426e0 Call Trace: anon_vma_chain_link mm/rmap.c:144 [inline] anon_vma_clone+0x2f5/0x710 mm/rmap.c:279 anon_vma_fork+0xf4/0x820 mm/rmap.c:332 dup_mmap kernel/fork.c:539 [inline] dup_mm kernel/fork.c:1317 [inline] copy_mm kernel/fork.c:1372 [inline] copy_process+0x47cc/0x8770 kernel/fork.c:1916 _do_fork+0x1cb/0x11d0 kernel/fork.c:2213 __do_sys_clone kernel/fork.c:2320 [inline] __se_sys_clone kernel/fork.c:2314 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2314 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ffa0b952f46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007ffefdbbcd80 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffefdbbcd80 RCX: 00007ffa0b952f46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffefdbbcde0 R08: 0000000000003eae R09: 0000000000003eae R10: 00007ffa0c26fa70 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffefdbbcda0 R14: 0000000000000005 R15: 0000000000000005 Modules linked in: kobject: 'loop1' (00000000606593e3): kobject_uevent_env kobject: 'loop2' (00000000a62421b8): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (00000000606593e3): fill_kobj_path: path = '/devices/virtual/block/loop1' EXT4-fs (loop5): Can't read superblock on 2nd try CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'loop4' (000000001ebc1bae): kobject_uevent_env kobject: 'loop4' (000000001ebc1bae): fill_kobj_path: path = '/devices/virtual/block/loop4' CR2: 00000000004ede98 CR3: 00000001c0bd1000 CR4: 00000000001426e0 FAT-fs (loop1): Directory bread(block 64) failed kobject: 'loop5' (00000000598b220f): kobject_uevent_env DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 EXT4-fs (loop2): Invalid log block size: 2949122 kobject: 'loop5' (00000000598b220f): kobject_uevent_env FAT-fs (loop1): Directory bread(block 65) failed kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (00000000598b220f): fill_kobj_path: path = '/devices/virtual/block/loop5' DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 FAT-fs (loop1): Directory bread(block 66) failed kobject: 'loop2' (00000000a62421b8): kobject_uevent_env --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.