bisecting cause commit starting from 3dbdb38e286903ec220aaf1fb29a8d94297da246
building syzkaller on 8f5a7b8cde529e0a19a53f79bdf9c6cad306827b
testing commit 3dbdb38e286903ec220aaf1fb29a8d94297da246 with gcc (GCC) 10.2.1 20210217
kernel signature: 0c918222f21b3682499f4b3d1f1264f91dcc6592d3670d266f17e60e95528b33
run #0: basic kernel testing failed: BUG: sleeping function called from invalid context in stack_depot_save
run #1: basic kernel testing failed: possible deadlock in fs_reclaim_acquire
run #2: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #3: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #4: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #5: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #6: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #7: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #8: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #9: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #10: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #11: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #12: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #13: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #14: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #15: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #16: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #17: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #18: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #19: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.13
testing commit 62fb9874f5da54fdb243003b386128037319b219 with gcc (GCC) 10.2.1 20210217
kernel signature: 2da1b527de5368761b09a6f259401abd1c605ab1f94b71e4905ece00f8cea55a
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.12
testing commit 9f4ad9e425a1d3b6a34617b8ea226d56a119a717 with gcc (GCC) 10.2.1 20210217
kernel signature: 884266a5556d1a62a64c7c25251d8e0a746aa9b98e5402d4603e05f52c0f9c5e
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.11
testing commit f40ddce88593482919761f74910f42f4b84c004b with gcc (GCC) 10.2.1 20210217
kernel signature: faff4e02bf88b0acf1f16e5f1ab07886c83dcfac928ee4cf5de45ec3e13087b0
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.10
testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 with gcc (GCC) 10.2.1 20210217
kernel signature: fff1832bb30f2fb014cf9b0fbe4a0d5a892d85cc8136d442973b7c49d798afd7
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.9
testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 10.2.1 20210217
kernel signature: 5785e9486a5e977919fe5ac69c504b6569270f36d9e66b520152cfc075cd365a
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.8
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.4.1 20210217
kernel signature: 3712ae112ff23d37f596bfa405462a40e2e297ce61053fccbe448109f35a8df4
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.4.1 20210217
kernel signature: 2ea728c8d505812270ca630c15d1a0691a43109b977111d2940a07ad3d46db5b
run #0: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #1: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #2: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #3: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #4: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #5: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #6: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #7: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #8: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
run #9: boot failed: can't ssh into the instance
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.4.1 20210217
kernel signature: 4363809744664c24eae962f9c60546778b94415a10e99052e289b18a14ec163b
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.4.1 20210217
kernel signature: 3742badedeee5fb8d92932e5dc01afcc58bb8271201494d2406f9ab94ad2d794
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.4.1 20210217
kernel signature: d265169f8fa87624429f717d57f8fbdcb4176648d87e479d68d22058616fc206
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.4.1 20210217
kernel signature: 4562466e9bd3a6d389efe8f1520b343e31131054932789bc6f3dca81b3523882
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.4.1 20210217
kernel signature: 69dd9fd583e80afafc4e424a12fe46521ed65905d6c4761b789cb676b8a4ab65
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.4.1 20210217
kernel signature: 139ecf62befefd4bd68e04b2f85fd36e366e928d91b11b979f7613563f54c685
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.4.1 20210217
kernel signature: 462f99299c9af10d16d9d5d468f56dcc3e2eb3a9231711e4d680b3586bc74aae
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.4.1 20210217
kernel signature: 6d6bb2ad4d29b3dd83eb681968b556d6b6e7672591ebd39794a0d5b7bde1293b
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.4.1 20210217
kernel signature: c8eb3d5a327af771561d22572e491fb47c0207db4389c0f62d65b0d77afcc632
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.4.1 20210217
kernel signature: 42daed019d57dea8a204be7abe0e5e2d95ac261f78c7759379116844389f4d01
all runs: crashed: BUG: unable to handle kernel paging request in vga16fb_fillrect
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.4.1 20210217
failed to run ["make" "-j" "64" "ARCH=x86_64" "CC=/syzkaller/shared/bisect_bin/gcc-8.1.0/bin/gcc" "bzImage"]: exit status 2
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with 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]
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with 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]
pager.c:36:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict]
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 v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with 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]
elf.c:134:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations]
elf.c:139:2: 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]
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with 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]
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with 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]
testing release v4.11
testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with 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 with 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 with 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 with 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 with 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 with 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: 18, total time: 3h9m49.254331817s (build: 2h0m8.966930952s, test: 1h4m17.989680741s)
the crash already happened on the oldest tested release
commit msg: Linux 4.18
crash: BUG: unable to handle kernel paging request in vga16fb_fillrect
ieee80211 phy11: Selected rate control algorithm 'minstrel_ht'
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
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: unable to handle kernel paging request at ffff880001000050
PGD bf30067 P4D bf30067 PUD bf31067 PMD 80000000010001e1 
Oops: 0003 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9970 Comm: syz-executor.5 Not tainted 4.18.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x87e/0x19b0 drivers/video/fbdev/vga16fb.c:923
Code: 8b 45 d0 8d 70 ff 85 c0 0f 84 30 fd ff ff 4c 63 7d c8 41 8d 7c 24 ff 31 d2 48 83 c7 01 49 8d 04 3e 45 85 e4 0f 84 0b 07 00 00 <41> 88 16 49 83 c6 01 49 39 c6 75 f4 4e 8d 34 38 83 ee 01 83 fe ff 
RSP: 0018:ffff8800a1cf71d8 EFLAGS: 00010206
RAX: ffff88000100006b RBX: 0000000000000000 RCX: 00000000000000a5
RDX: 0000000000000000 RSI: 000000000ffeb7ff RDI: 000000000000001b
RBP: ffff8800a1cf7250 R08: ffff8800a1cf72a4 R09: 0000000000000050
R10: 1ffff10016c04177 R11: ffff880237c6543f R12: 000000000000001b
R13: 1ffffffff12612b6 R14: ffff880001000050 R15: 00000000000000a5
FS:  00007f944d25d700(0000) GS:ffff8800ba600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff880001000050 CR3: 00000000a10bc000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_clear_margins+0x2ae/0x610 drivers/video/fbdev/core/bitblit.c:224
 fbcon_clear_margins+0x1a8/0x320 drivers/video/fbdev/core/fbcon.c:1325
 fbcon_switch+0xc21/0x1860 drivers/video/fbdev/core/fbcon.c:2307
 redraw_screen+0x314/0x800 drivers/tty/vt/vt.c:690
 fbcon_modechanged+0x566/0x880 drivers/video/fbdev/core/fbcon.c:2955
 fbcon_event_notify+0xcc/0x1980 drivers/video/fbdev/core/fbcon.c:3308
 notifier_call_chain+0x8a/0x160 kernel/notifier.c:93
 __blocking_notifier_call_chain kernel/notifier.c:317 [inline]
 __blocking_notifier_call_chain kernel/notifier.c:304 [inline]
 blocking_notifier_call_chain kernel/notifier.c:328 [inline]
 blocking_notifier_call_chain+0x6b/0xa0 kernel/notifier.c:325
 fb_notifier_call_chain+0x16/0x20 drivers/video/fbdev/core/fb_notify.c:45
 fb_set_var+0xadd/0xf60 drivers/video/fbdev/core/fbmem.c:1035
 do_fb_ioctl+0x44c/0x940 drivers/video/fbdev/core/fbmem.c:1108
 fb_ioctl+0xc8/0x140 drivers/video/fbdev/core/fbmem.c:1223
 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: 0033:0x4665d9
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:00007f944d25d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000020000200 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd83be303f R14: 00007f944d25d300 R15: 0000000000022000
Modules linked in:
CR2: ffff880001000050
---[ end trace d7a52d77f73727cf ]---
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x87e/0x19b0 drivers/video/fbdev/vga16fb.c:923
Code: 8b 45 d0 8d 70 ff 85 c0 0f 84 30 fd ff ff 4c 63 7d c8 41 8d 7c 24 ff 31 d2 48 83 c7 01 49 8d 04 3e 45 85 e4 0f 84 0b 07 00 00 <41> 88 16 49 83 c6 01 49 39 c6 75 f4 4e 8d 34 38 83 ee 01 83 fe ff 
RSP: 0018:ffff8800a1cf71d8 EFLAGS: 00010206
RAX: ffff88000100006b RBX: 0000000000000000 RCX: 00000000000000a5
RDX: 0000000000000000 RSI: 000000000ffeb7ff RDI: 000000000000001b
RBP: ffff8800a1cf7250 R08: ffff8800a1cf72a4 R09: 0000000000000050
R10: 1ffff10016c04177 R11: ffff880237c6543f R12: 000000000000001b
R13: 1ffffffff12612b6 R14: ffff880001000050 R15: 00000000000000a5
FS:  00007f944d25d700(0000) GS:ffff8800ba600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff880001000050 CR3: 00000000a10bc000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400