bisecting cause commit starting from 7fd2bf83d59a2d32e0d596c5d3e623b9a0e7e2d5
building syzkaller on 838e7e2cd9228583ca33c49a39aea4d863d3e36d
testing commit 7fd2bf83d59a2d32e0d596c5d3e623b9a0e7e2d5
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: e57e867941714fd7dade89907359ce9ea30e0758fee8bb77d555b836b65a9704
run #0: crashed: INFO: task hung in tty_ioctl
run #1: crashed: INFO: task hung in tty_ioctl
run #2: crashed: INFO: task hung in tty_ioctl
run #3: crashed: INFO: task hung in tty_ioctl
run #4: crashed: INFO: task hung in tty_ioctl
run #5: crashed: INFO: task hung in tty_ioctl
run #6: crashed: INFO: task hung in tty_ioctl
run #7: crashed: INFO: task hung in tty_ioctl
run #8: crashed: INFO: task hung in paste_selection
run #9: crashed: INFO: task hung in paste_selection
run #10: crashed: INFO: task hung in tty_ioctl
run #11: crashed: INFO: task hung in tty_ioctl
run #12: crashed: INFO: task hung in tty_ioctl
run #13: crashed: INFO: task hung in paste_selection
run #14: crashed: INFO: task hung in tty_ioctl
run #15: crashed: INFO: task hung in tty_ioctl
run #16: crashed: INFO: task hung in tty_ioctl
run #17: OK
run #18: OK
run #19: OK
testing release v5.14
testing commit 7d2a07b769330c34b4deabeed939325c77a7ec2f
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 62754d422f9f42609ce8d69b346efd4f1992c39fe75e2c0af96722229c0c0e07
run #0: crashed: INFO: task hung in paste_selection
run #1: crashed: INFO: task hung in paste_selection
run #2: crashed: INFO: task hung in paste_selection
run #3: crashed: INFO: task hung in paste_selection
run #4: crashed: INFO: task hung in paste_selection
run #5: crashed: INFO: task hung in paste_selection
run #6: crashed: INFO: task hung in paste_selection
run #7: crashed: INFO: task hung in tty_ldisc_hangup
run #8: crashed: INFO: task hung in paste_selection
run #9: crashed: INFO: task hung in paste_selection
testing release v5.13
testing commit 62fb9874f5da54fdb243003b386128037319b219
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: fae845f2a563e1cab730e845c4f7563ed3bad003d24d20757c51df0b32298357
run #0: crashed: INFO: task hung in paste_selection
run #1: crashed: INFO: task hung in paste_selection
run #2: crashed: INFO: task hung in paste_selection
run #3: crashed: INFO: task hung in paste_selection
run #4: crashed: INFO: task hung in tty_ldisc_hangup
run #5: crashed: INFO: task hung in paste_selection
run #6: crashed: INFO: task hung in tty_ldisc_hangup
run #7: crashed: INFO: task hung in tty_ldisc_hangup
run #8: crashed: INFO: task hung in tty_ldisc_hangup
run #9: crashed: INFO: task hung in tty_ldisc_hangup
testing release v5.12
testing commit 9f4ad9e425a1d3b6a34617b8ea226d56a119a717
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 940f64a6af86746e3023648ff6d9168b64219d61cf0fff293d569987bb7dd3eb
all runs: crashed: INFO: task hung in paste_selection
testing release v5.11
testing commit f40ddce88593482919761f74910f42f4b84c004b
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 13e090d841e71c7d89717ea3a0ef74b99ca59759bbf4e9bce437e048aff516eb
run #0: crashed: INFO: task hung in paste_selection
run #1: crashed: INFO: task hung in paste_selection
run #2: crashed: INFO: task hung in paste_selection
run #3: crashed: INFO: task hung in paste_selection
run #4: crashed: INFO: task hung in paste_selection
run #5: crashed: INFO: task hung in paste_selection
run #6: crashed: INFO: task hung in paste_selection
run #7: crashed: INFO: task hung in paste_selection
run #8: crashed: INFO: task hung in tty_ldisc_hangup
run #9: crashed: INFO: task hung in paste_selection
testing release v5.10
testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 4fae4bfed99de831a49740988bfc5b777d30e9744e5b46ecbeb11269f4949ee5
run #0: crashed: INFO: task hung in paste_selection
run #1: crashed: INFO: task hung in paste_selection
run #2: crashed: INFO: task hung in paste_selection
run #3: crashed: INFO: task hung in paste_selection
run #4: crashed: INFO: task hung in paste_selection
run #5: crashed: INFO: task hung in paste_selection
run #6: crashed: INFO: task hung in paste_selection
run #7: crashed: INFO: task hung in tty_ldisc_hangup
run #8: crashed: INFO: task hung in paste_selection
run #9: crashed: INFO: task hung in paste_selection
testing release v5.9
testing commit bbf5c979011a099af5dc76498918ed7df445635b
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 104cf907e7468119a5b5924600f4c09cf828f17c7264e0e229e3ff82d1f82d60
all runs: crashed: INFO: task hung in paste_selection
testing release v5.8
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c
compiler: gcc (GCC) 8.4.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 67cc2da7ce754261edc3b0c73cd03eddc179d683ec3a909794907bf60bed225e
all runs: crashed: INFO: task hung in paste_selection
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162
compiler: gcc version 8.4.1 20210217 (GCC), GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 85c2b8d495fc02101fb3e5b64213471944031299a28b0cd4d515b243b9c3b361
run #0: crashed: INFO: task hung in paste_selection
run #1: crashed: INFO: task hung in paste_selection
run #2: crashed: INFO: task hung in paste_selection
run #3: crashed: INFO: task hung in paste_selection
run #4: crashed: INFO: task hung in paste_selection
run #5: crashed: INFO: task hung in tty_ldisc_hangup
run #6: crashed: INFO: task hung in paste_selection
run #7: crashed: INFO: task hung in paste_selection
run #8: crashed: INFO: task hung in paste_selection
run #9: crashed: INFO: task hung in paste_selection
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: a41438c7b9b2f606a6a4fe19fe57c0df4e98d23cb262ce192f6b4b38f809a914
all runs: crashed: INFO: task hung in paste_selection
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: d6d4a147d3237c236ab04f9bede51eaa8cf52b3c5004f665efeb9ee6546be4e8
run #0: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #1: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #2: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #3: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #4: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #5: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #6: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #7: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
run #8: crashed: INFO: task hung in paste_selection
run #9: crashed: INFO: task hung in paste_selection
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 0b7fe0e50e9462efcc34b748b9c29b93c96301860be6422f7beee45245400181
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: d6d65c90cc9aa8115ff76dad80cfaab1362b0d5d0127817aa38e31fc47965bbc
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: de760a084168917101d2728306d16abcc1d0e1efa7b8358c01a53f83d3e3ad09
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 24e8fedd71decabcb7717d1d3e98031abaa62d3957ee57f43a8d81a8a1b08c05
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 7bfa33da241a7ab383a4b681ceb19d2599f8a7a9b12bb00d5bc0f82be0d0de17
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 3f5b81c994d218f77e49b3ef3fcf359ce499f2e886ac13ba2dcc211837ed9c6b
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 783125a759f6f11cdcf73165d1452c8ceb214a4358f0edecc27d673fe4f93b0d
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: b699bcbdad14d89422676c0376d93f6f4dc9fbed417d25b85062420fb5b3a79f
all runs: crashed: KASAN: use-after-free Read in n_tty_receive_buf_common
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4
compiler: gcc (GCC) 8.4.1 20210217
./security/selinux/include/classmap.h:247:2: error: #error New address family defined, please update secclass_map.
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda
compiler: gcc (GCC) 8.4.1 20210217
./security/selinux/include/classmap.h:247:2: error: #error New address family defined, please update secclass_map.
orc_dump.c:106:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
orc_dump.c:111:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
elf.c:135:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:140:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff
compiler: gcc (GCC) 8.4.1 20210217
orc_dump.c:106:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
orc_dump.c:111:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
elf.c:135:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:140:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
pager.c:36:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
./security/selinux/include/classmap.h:247:2: error: #error New address family defined, please update secclass_map.
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4
compiler: gcc (GCC) 8.4.1 20210217
orc_dump.c:105:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
orc_dump.c:110:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
pager.c:36:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
elf.c:134:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:139:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
./security/selinux/include/classmap.h:245:2: error: #error New address family defined, please update secclass_map.
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261
compiler: gcc (GCC) 8.4.1 20210217
pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
elf.c:144:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:149:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
./security/selinux/include/classmap.h:242:2: error: #error New address family defined, please update secclass_map.
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c
compiler: gcc (GCC) 8.4.1 20210217
pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
elf.c:141:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:146:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
./security/selinux/include/classmap.h:238:2: error: #error New address family defined, please update secclass_map.
testing release v4.11
testing commit a351e9b9fc24e982ec2f0e76379a49826036da12
compiler: gcc (GCC) 7.5.0
elf.c:141:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:146:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
testing release v4.10
testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
compiler: gcc (GCC) 5.5.0
tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes]
elf.c:129:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:134:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826
compiler: gcc (GCC) 5.5.0
tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes]
elf.c:129:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:134:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3
compiler: gcc (GCC) 5.5.0
tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes]
elf.c:129:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:134:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
pager.c:33:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e
compiler: gcc (GCC) 5.5.0
tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes]
elf.c:122:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:127:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations]
pager.c:33:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a
compiler: gcc (GCC) 5.5.0
tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes]
pager.c:33:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
revisions tested: 19, total time: 3h52m44.970945649s (build: 2h1m8.121885805s, test: 1h46m19.988962943s)
the crash already happened on the oldest tested release
commit msg: Linux 4.18
crash: KASAN: use-after-free Read in n_tty_receive_buf_common
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
==================================================================
BUG: KASAN: use-after-free in put_tty_queue drivers/tty/n_tty.c:304 [inline]
BUG: KASAN: use-after-free in n_tty_receive_buf_standard drivers/tty/n_tty.c:1564 [inline]
BUG: KASAN: use-after-free in __receive_buf drivers/tty/n_tty.c:1631 [inline]
BUG: KASAN: use-after-free in n_tty_receive_buf_common+0x1df0/0x2e40 drivers/tty/n_tty.c:1727
Read of size 1 at addr ffff8800947083c1 by task syz-executor.3/9536

CPU: 0 PID: 9536 Comm: syz-executor.3 Not tainted 4.18.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x15a/0x20d lib/dump_stack.c:113
 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold.7+0x242/0x308 mm/kasan/report.c:396
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 put_tty_queue drivers/tty/n_tty.c:304 [inline]
 n_tty_receive_buf_standard drivers/tty/n_tty.c:1564 [inline]
 __receive_buf drivers/tty/n_tty.c:1631 [inline]
 n_tty_receive_buf_common+0x1df0/0x2e40 drivers/tty/n_tty.c:1727
 n_tty_receive_buf2+0xf/0x20 drivers/tty/n_tty.c:1762
 tty_ldisc_receive_buf+0x86/0x1b0 drivers/tty/tty_buffer.c:456
 paste_selection+0x253/0x3e0 drivers/tty/vt/selection.c:349
 tioclinux+0x10b/0x390 drivers/tty/vt/vt.c:2693
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd099f5f8d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 
RSP: 002b:00007fd0996d6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd09a063f60 RCX: 00007fd099f5f8d9
RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000005
RBP: 00007fd099fb9cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc27976d9f R14: 00007fd0996d6300 R15: 0000000000022000

Allocated by task 9528:
 save_stack mm/kasan/kasan.c:448 [inline]
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553
 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x151/0x400 mm/slab.c:3727
 kmalloc_array include/linux/slab.h:635 [inline]
 set_selection+0x657/0xe40 drivers/tty/vt/selection.c:283
 tioclinux+0xf6/0x390 drivers/tty/vt/vt.c:2689
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9619:
 save_stack mm/kasan/kasan.c:448 [inline]
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x13c/0x220 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x280 mm/slab.c:3813
 set_selection+0x67c/0xe40 drivers/tty/vt/selection.c:290
 tioclinux+0xf6/0x390 drivers/tty/vt/vt.c:2689
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8800947083c0
 which belongs to the cache kmalloc-8192 of size 8192
The buggy address is located 1 bytes inside of
 8192-byte region [ffff8800947083c0, ffff88009470a3c0)
The buggy address belongs to the page:
page:ffffea000251c200 count:1 mapcount:0 mapping:ffff8800b6002080 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea000252d808 ffffea0002b69408 ffff8800b6002080
raw: 0000000000000000 ffff8800947083c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
page allocated via order 2, migratetype Unmovable, gfp_mask 0x442c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:1906 [inline]
 prep_new_page mm/page_alloc.c:1914 [inline]
 get_page_from_freelist+0x2f35/0x46b0 mm/page_alloc.c:3345
 __alloc_pages_nodemask+0x39e/0x2780 mm/page_alloc.c:4369
 __alloc_pages include/linux/gfp.h:456 [inline]
 __alloc_pages_node include/linux/gfp.h:469 [inline]
 kmem_getpages mm/slab.c:1409 [inline]
 cache_grow_begin+0xa5/0x8c0 mm/slab.c:2677
 cache_alloc_refill+0x2ac/0x380 mm/slab.c:3044
 ____cache_alloc mm/slab.c:3127 [inline]
 __do_cache_alloc mm/slab.c:3349 [inline]
 slab_alloc mm/slab.c:3384 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x37b/0x400 mm/slab.c:3727
 kmalloc_array include/linux/slab.h:635 [inline]
 set_selection+0x657/0xe40 drivers/tty/vt/selection.c:283
 tioclinux+0xf6/0x390 drivers/tty/vt/vt.c:2689
 vt_ioctl+0x187a/0x2120 drivers/tty/vt/vt_ioctl.c:362
 tty_ioctl+0x456/0x1280 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684
 ksys_ioctl+0x62/0x90 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706
 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Memory state around the buggy address:
 ffff880094708280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff880094708300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff880094708380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                           ^
 ffff880094708400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880094708480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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