Messages in this thread | | | Date | Thu, 21 Feb 2019 06:52:04 -0800 | Subject | BUG: unable to handle kernel NULL pointer dereference in __generic_file_write_iter | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 4aa9fc2a435a Revert "mm, memory_hotplug: initialize struct.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1101382f400000 kernel config: https://syzkaller.appspot.com/x/.config?x=4fceea9e2d99ac20 dashboard link: https://syzkaller.appspot.com/bug?extid=ca95b2b7aef9e7cbd6ab compiler: gcc (GCC) 9.0.0 20181231 (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+ca95b2b7aef9e7cbd6ab@syzkaller.appspotmail.com
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 #PF error: [INSTR] PGD a7ea0067 P4D a7ea0067 PUD 81535067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 15924 Comm: syz-executor0 Not tainted 5.0.0-rc4+ #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff88804c3d7858 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffff885aeb60 RCX: 000000000000005b RDX: 0000000000000000 RSI: ffff88807ec22930 RDI: ffff8880a59bdcc0 RBP: ffff88804c3d79b8 R08: 0000000000000000 R09: ffff88804c3d7910 R10: ffff8880835ca200 R11: 0000000000000000 R12: 000000000000005b R13: ffff88804c3d7c98 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f3456db4700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000814ac000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3333 ext4_file_write_iter+0x37a/0x1410 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3456db3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089 RDX: 000000000000005b RSI: 0000000020000240 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3456db46d4 R13: 00000000004c7450 R14: 00000000004dce68 R15: 00000000ffffffff Modules linked in: CR2: 0000000000000000 ---[ end trace 5cac9d2c75a59916 ]--- kobject: 'loop5' (000000004426a409): kobject_uevent_env RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff88804c3d7858 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffff885aeb60 RCX: 000000000000005b kobject: 'loop5' (000000004426a409): fill_kobj_path: path = '/devices/virtual/block/loop5' RDX: 0000000000000000 RSI: ffff88807ec22930 RDI: ffff8880a59bdcc0 kobject: 'loop2' (00000000b82e0c58): kobject_uevent_env kobject: 'loop2' (00000000b82e0c58): fill_kobj_path: path = '/devices/virtual/block/loop2' RBP: ffff88804c3d79b8 R08: 0000000000000000 R09: ffff88804c3d7910 R10: ffff8880835ca200 R11: 0000000000000000 R12: 000000000000005b R13: ffff88804c3d7c98 R14: dffffc0000000000 R15: 0000000000000000 kobject: 'loop5' (000000004426a409): kobject_uevent_env FS: 00007f3456db4700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 kobject: 'loop5' (000000004426a409): fill_kobj_path: path = '/devices/virtual/block/loop5' CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000022029a0 CR3: 00000000814ac000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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