bisecting cause commit starting from 51d69817519f5f00041a1a039277f0367d76c82c building syzkaller on f9b6950728295eb8f52b05a0d9e5dccd99f93eaa testing commit 51d69817519f5f00041a1a039277f0367d76c82c with gcc (GCC) 8.1.0 kernel signature: 7a2b9a663ccc8e4ffa8a1a21efed924c1967cc93 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 91a1982d0ab1b86625f3f6496dafec08697c2df3 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: f716052f181b83cdd8be184c824b48ab67d75f8b all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: d7d345bfe1e74f5697e739d7ec556593774bd89d all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: f2a340389d069737d03d24c27d68120ba8b3d63c all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 04dd066d7c52bb21b7411e7d601ee8c6e5f47d69 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 65a09bd06402a524331f2d33374b71c9ca160879 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 734f07a15073dc0819d8f646a1a8fecb0b7ed546 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: a247ae1f205ea01953341b532e43990de5c99298 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 67992d53818cb457a0f5ff99b4403b49ddb248ea all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: c087c30a926eae5852e2e173cf33bf57dfce6508 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: aafa065aa097f0ec997d69292bcd96cdabff9cdf all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 78a3a012f571cb25965b44143c0eabee0117c778 all runs: crashed: BUG: unable to handle kernel paging request in csi_J testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 5c1bcb7b390068b57cae82216cbbb2f818c8e36c all runs: crashed: general protection fault in csi_J testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: afc18f58abca4f7758daa2c3e76ce3c351a9735d all runs: crashed: general protection fault in csi_J testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 kernel signature: 0d46085dd47d9e4e6a408e88881e61b50c851d36 all runs: crashed: general protection fault in csi_J testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 kernel signature: dda6cda77a78114361b8e8bfe44ba8f5ab744c7b all runs: crashed: general protection fault in csi_J testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: c0562503d1d3fbae1b09a0e692d15f3996191f95 all runs: crashed: general protection fault in csi_J testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 80bc0ff9bd043d165c62cc522bf2662d27c9ce16 all runs: crashed: general protection fault in csi_J testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 7405b54fbae34e19406a0b11510b71a1079c32ef all runs: crashed: general protection fault in csi_J testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: c4af94ebb246a58e074016a1adaccf5dc40b84d0 all runs: crashed: general protection fault in csi_J revisions tested: 21, total time: 3h10m57.400761288s (build: 1h54m2.955280741s, test: 1h14m23.825474437s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: general protection fault in csi_J IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready device veth1_vlan entered promiscuous mode kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 8407 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800adb1e740 ti: ffff8800ac938000 task.ti: ffff8800ac938000 RIP: 0010:[] [] scr_memsetw include/linux/vt_buffer.h:31 [inline] RIP: 0010:[] [] csi_J+0x264/0x580 drivers/tty/vt/vt.c:1187 RSP: 0018:ffff8800ac93f778 EFLAGS: 00010203 RAX: 0000000020000001 RBX: 0000000100000010 RCX: 0000000000000000 RDX: 7fffffff80000001 RSI: 000000010000000e RDI: 000000010000000e RBP: ffff8800ac93f7b8 R08: ffff8800ac80fae0 R09: dffffc0000000000 R10: 0000000000000011 R11: 0000000000000001 R12: ffff8800ac80f600 R13: 0000000000000720 R14: dffffc0000000000 R15: 0000000100000010 FS: 00007f28cf493700(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001a01580 CR3: 00000000ae31b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8800adb1f010 1ffff10015927ef2 ffff880000000000 00000000203e4001 ffff8800ac80f600 ffff8800ad8bedc0 ffffed0015901f37 1ffff10015927f00 ffff8800ac93f928 ffffffff83007dc6 ffff8800adb1e740 0000000000000086 Call Trace: [] do_con_trol+0x4526/0x5a40 drivers/tty/vt/vt.c:1999 [] do_con_write.part.22+0x487/0x1950 drivers/tty/vt/vt.c:2421 [] do_con_write drivers/tty/vt/vt.c:2779 [inline] [] con_write+0x76/0x90 drivers/tty/vt/vt.c:2775 [] process_output_block drivers/tty/n_tty.c:581 [inline] [] n_tty_write+0x4f0/0x10b0 drivers/tty/n_tty.c:2313 [] do_tty_write drivers/tty/tty_io.c:1175 [inline] [] tty_write+0x44d/0x7f0 drivers/tty/tty_io.c:1260 [] __vfs_write+0xdb/0x4f0 fs/read_write.c:529 [] vfs_write+0x13a/0x4a0 fs/read_write.c:578 [] SYSC_write fs/read_write.c:625 [inline] [] SyS_write+0xcb/0x1a0 fs/read_write.c:617 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Code: 03 00 00 89 d8 48 89 f7 49 be 00 00 00 00 00 fc ff df d1 e8 8d 48 ff 85 c0 4c 8d 7c 4e 02 74 32 48 8d 5f 02 48 89 f8 48 c1 e8 03 <42> 0f b6 0c 30 48 89 f8 83 e0 07 83 c0 01 38 c8 7c 08 84 c9 0f RIP [] scr_memsetw include/linux/vt_buffer.h:31 [inline] RIP [] csi_J+0x264/0x580 drivers/tty/vt/vt.c:1187 RSP ---[ end trace 79ce8957c5b0f1c8 ]---