Public bug reported:
Using the bionic-4.15.0-15.16-generic-amd64, the command "timeout 1 cat
/sys/kernel/mm/page_idle/bitmap" will generate an oops.
Other information
cat /proc/version_signature:
Ubuntu 4.15.0-15.16-generic 4.15.15
(No lspci available, can get if needed).
Full oops:
[ 76.783820] BUG: unable to handle kernel NULL pointer dereference at
00000000000006d0
[ 76.785349] IP: page_idle_get_page+0xcb/0x1a0
[ 76.786079] PGD 0 P4D 0
[ 76.786523] Oops: 0000 [#1] SMP PTI
[ 76.787136] Modules linked in: kvm_intel kvm irqbypass crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd input_leds joydev serio_raw mac_hid sch_fq_codel ip_tables
x_tables autofs4 btrfs xor zstd_compress raid6_pq psmouse floppy e1000
i2c_piix4 pata_acpi
[ 76.791780] CPU: 0 PID: 605 Comm: cat Not tainted 4.15.0-15-generic
#16-Ubuntu
[ 76.792997] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[ 76.793987] RIP: 0010:page_idle_get_page+0xcb/0x1a0
[ 76.794775] RSP: 0018:ffffa5b680473df0 EFLAGS: 00010202
[ 76.795694] RAX: 0000000000000001 RBX: ffffce7dc0ffff80 RCX: 0000000000000003
[ 76.796908] RDX: 00000000000001c9 RSI: ffff98cbbe384200 RDI: 0000000000ffff80
[ 76.798471] RBP: ffffa5b680473e08 R08: 0000000000007000 R09: 0000000000001000
[ 76.799680] R10: ffff98cbb9d0a700 R11: 0000000000007000 R12: 0000000000000680
[ 76.800892] R13: ffffce7dc0ffff80 R14: 0000000000040000 R15: ffff98cbbd175000
[ 76.802111] FS: 00007fcb03cff540(0000) GS:ffff98cbbfc00000(0000)
knlGS:0000000000000000
[ 76.803512] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 76.804505] CR2: 00000000000006d0 CR3: 000000003927e000 CR4: 00000000000406f0
[ 76.805766] Call Trace:
[ 76.806208] page_idle_bitmap_read+0xdf/0x170
[ 76.806966] sysfs_kf_bin_read+0x4d/0x80
[ 76.807637] kernfs_fop_read+0xad/0x180
[ 76.808324] __vfs_read+0x1b/0x40
[ 76.808907] vfs_read+0x8e/0x130
[ 76.809473] SyS_read+0x55/0xc0
[ 76.810026] do_syscall_64+0x73/0x130
[ 76.810668] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[ 76.811532] RIP: 0033:0x7fcb03800081
[ 76.812171] RSP: 002b:00007fff25fa65c8 EFLAGS: 00000246 ORIG_RAX:
0000000000000000
[ 76.813456] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007fcb03800081
[ 76.814683] RDX: 0000000000020000 RSI: 00007fcb03b42000 RDI: 0000000000000003
[ 76.816183] RBP: 0000000000020000 R08: 00000000ffffffff R09: 0000000000000000
[ 76.817408] R10: 0000000000000022 R11: 0000000000000246 R12: 00007fcb03b42000
[ 76.818594] R13: 0000000000000003 R14: 0000000000001000 R15: 0000000000020000
[ 76.819816] Code: f0 0f b1 0a 75 7d 48 8b 03 48 89 c2 48 c1 e8 33 83 e0 07
48 c1 ea 36 48 8d 0c 40 4c 8d 24 88 49 c1 e4 07 4c 03 24 d5 c0 b5 05 ae <49> 8b
44 24 50 48 8d b8 80 a1 02 00 e8 04 26 73 00 48 8b 53 20
[ 76.823041] RIP: page_idle_get_page+0xcb/0x1a0 RSP: ffffa5b680473df0
[ 76.824117] CR2: 00000000000006d0
[ 76.824720] ---[ end trace 414e619d6174dd72 ]---
Can get full dmesg output if desired.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1769265
Title:
kernel-oops unable to handle kernel NULL pointer in
page_idle_get_page
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