bisecting fixing commit since b94de4d19498b454645b72d08a05d32fa9074fb5 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit b94de4d19498b454645b72d08a05d32fa9074fb5 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: ac516885b7ae620bf4b6aa8c197a3f1ef25a07552c3a37ef0ea1da965b2688f8 run #0: crashed: kernel BUG in f2fs_get_meta_page_nofail run #1: crashed: kernel BUG in f2fs_get_meta_page_nofail run #2: crashed: kernel BUG in f2fs_get_meta_page_nofail run #3: crashed: kernel BUG in f2fs_get_meta_page_nofail run #4: crashed: kernel BUG in f2fs_get_meta_page_nofail run #5: crashed: kernel BUG in f2fs_get_meta_page_nofail run #6: crashed: kernel BUG in f2fs_get_meta_page_nofail run #7: crashed: kernel BUG in f2fs_get_meta_page_nofail run #8: crashed: kernel BUG in f2fs_get_meta_page_nofail run #9: crashed: kernel BUG in f2fs_get_meta_page_nofail run #10: crashed: kernel BUG in f2fs_get_meta_page_nofail run #11: crashed: kernel BUG in f2fs_get_meta_page_nofail run #12: crashed: kernel BUG in corrupted run #13: crashed: kernel BUG in f2fs_get_meta_page_nofail run #14: crashed: kernel BUG in corrupted run #15: crashed: kernel BUG in f2fs_get_meta_page_nofail run #16: crashed: kernel BUG in f2fs_get_meta_page_nofail run #17: crashed: kernel BUG in f2fs_get_meta_page_nofail run #18: crashed: kernel BUG in f2fs_get_meta_page_nofail run #19: crashed: kernel BUG in f2fs_get_meta_page_nofail testing current HEAD 59456c9cc40c8f75b5a7efa0fe1f211d9c6fcaf1 testing commit 59456c9cc40c8f75b5a7efa0fe1f211d9c6fcaf1 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 6c4bdb3b04d92f3145a9cff10eb51543255a3870a8c003b2478e11fb363a3b22 run #0: crashed: kernel BUG in f2fs_get_meta_page_nofail run #1: crashed: kernel BUG in corrupted run #2: crashed: kernel BUG in f2fs_get_meta_page_nofail run #3: crashed: kernel BUG in f2fs_get_meta_page_nofail run #4: crashed: kernel BUG in f2fs_get_meta_page_nofail run #5: crashed: kernel BUG in f2fs_get_meta_page_nofail run #6: crashed: kernel BUG in f2fs_get_meta_page_nofail run #7: crashed: kernel BUG in f2fs_get_meta_page_nofail run #8: crashed: kernel BUG in f2fs_get_meta_page_nofail run #9: crashed: kernel BUG in f2fs_get_meta_page_nofail revisions tested: 2, total time: 29m47.613643874s (build: 22m27.440045212s, test: 6m42.567356356s) the crash still happens on HEAD commit msg: Linux 4.19.204 crash: kernel BUG in f2fs_get_meta_page_nofail attempt to access beyond end of device attempt to access beyond end of device attempt to access beyond end of device ------------[ cut here ]------------ loop5: rw=12288, want=20512, limit=16368 kernel BUG at fs/f2fs/checkpoint.c:127! attempt to access beyond end of device attempt to access beyond end of device loop2: rw=12288, want=20504, limit=16368 loop3: rw=12288, want=20504, limit=16368 invalid opcode: 0000 [#1] PREEMPT SMP KASAN loop5: rw=12288, want=20520, limit=16368 CPU: 0 PID: 9240 Comm: syz-executor.1 Not tainted 4.19.204-syzkaller #0 attempt to access beyond end of device Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:f2fs_get_meta_page_nofail+0x41/0x50 fs/f2fs/checkpoint.c:127 Code: 00 00 4c 89 ee 4c 89 e7 e8 dc bc ff ff 48 3d 00 f0 ff ff 76 17 48 83 f8 fb 75 05 83 eb 01 75 dd 31 f6 4c 89 e7 e8 cf f2 ff ff <0f> 0b 5b 41 5c 41 5d 5d c3 66 0f 1f 44 00 00 55 31 d2 48 89 e5 e8 RSP: 0018:ffff8881d425f858 EFLAGS: 00010286 RAX: ffff8881e89b8140 RBX: 0000000000000000 RCX: 1ffff1103a2e0d67 RDX: ffffffff00000001 RSI: 0000000000000004 RDI: ffffffff8bad8720 RBP: ffff8881d425f870 R08: 0000000000000000 R09: ffffffff8b5c6978 R10: ffff8881d1706bc0 R11: 0000000000000001 R12: ffff8881e85b4400 R13: 0000000000000a00 R14: ffff8881e85b4400 R15: ffff8881d12d1240 FS: 00007f4b484f9700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 loop5: rw=12288, want=20528, limit=16368 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 attempt to access beyond end of device CR2: 00007f23d3d3b000 CR3: 00000001ce060006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_current_nat_page+0x12d/0x1b0 fs/f2fs/node.c:116 __f2fs_build_free_nids fs/f2fs/node.c:2287 [inline] f2fs_build_free_nids+0x2a6/0xf30 fs/f2fs/node.c:2328 f2fs_build_node_manager+0x1fb8/0x2c30 fs/f2fs/node.c:3055 loop5: rw=12288, want=20536, limit=16368 f2fs_fill_super fs/f2fs/super.c:3022 [inline] f2fs_fill_super+0x31a3/0x70f0 fs/f2fs/super.c:2803 attempt to access beyond end of device loop5: rw=12288, want=20544, limit=16368 mount_bdev+0x26f/0x330 fs/super.c:1158 f2fs_mount+0x10/0x20 fs/f2fs/super.c:3234 attempt to access beyond end of device mount_fs+0x7f/0x2b0 fs/super.c:1261 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2483 [inline] do_mount+0x376/0x2630 fs/namespace.c:2813 ksys_mount+0xb1/0xd0 fs/namespace.c:3029 __do_sys_mount fs/namespace.c:3043 [inline] __se_sys_mount fs/namespace.c:3040 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3040 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466daa Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f4b484f8fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466daa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4b484f9000 RBP: 00007f4b484f9040 R08: 00007f4b484f9040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f4b484f9000 R15: 0000000020012400 Modules linked in: attempt to access beyond end of device loop5: rw=12288, want=20488, limit=16368 attempt to access beyond end of device attempt to access beyond end of device loop4: rw=12288, want=20488, limit=16368 loop5: rw=12288, want=20488, limit=16368 attempt to access beyond end of device attempt to access beyond end of device loop3: rw=12288, want=20512, limit=16368 loop5: rw=12288, want=20488, limit=16368 attempt to access beyond end of device attempt to access beyond end of device attempt to access beyond end of device loop5: rw=12288, want=20488, limit=16368 loop2: rw=12288, want=20512, limit=16368 attempt to access beyond end of device loop0: rw=12288, want=20536, limit=16368 loop5: rw=12288, want=20488, limit=16368 loop4: rw=12288, want=20488, limit=16368 attempt to access beyond end of device attempt to access beyond end of device loop5: rw=12288, want=20488, limit=16368 loop4: rw=12288, want=20488, limit=16368 loop3: rw=12288, want=20520, limit=16368 attempt to access beyond end of device attempt to access beyond end of device ------------[ cut here ]------------ attempt to access beyond end of device kernel BUG at fs/f2fs/checkpoint.c:127! loop0: rw=12288, want=20544, limit=16368 attempt to access beyond end of device attempt to access beyond end of device loop2: rw=12288, want=20520, limit=16368 loop0: rw=12288, want=20488, limit=16368 loop5: rw=12288, want=20488, limit=16368 attempt to access beyond end of device attempt to access beyond end of device loop0: rw=12288, want=20488, limit=16368 invalid opcode: 0000 [#2] PREEMPT SMP KASAN CPU: 1 PID: 9271 Comm: syz-executor.4 Tainted: G D 4.19.204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:f2fs_get_meta_page_nofail+0x41/0x50 fs/f2fs/checkpoint.c:127 Code: 00 00 4c 89 ee 4c 89 e7 e8 dc bc ff ff 48 3d 00 f0 ff ff 76 17 48 83 f8 fb 75 05 83 eb 01 75 dd 31 f6 4c 89 e7 e8 cf f2 ff ff <0f> 0b 5b 41 5c 41 5d 5d c3 66 0f 1f 44 00 00 55 31 d2 48 89 e5 e8 RSP: 0018:ffff8881f5377858 EFLAGS: 00010286 attempt to access beyond end of device RAX: ffff8881e7d0e080 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffffff00000001 RSI: 0000000000000000 RDI: ffffffff8bad8720 RBP: ffff8881f5377870 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881cfa70e00 R13: 0000000000000a00 R14: ffff8881cfa70e00 R15: ffff8881d78c7b40 FS: 00007eff001e7700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055da053e8140 CR3: 00000001e82c4003 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_current_nat_page+0x12d/0x1b0 fs/f2fs/node.c:116 loop0: rw=12288, want=20488, limit=16368 attempt to access beyond end of device __f2fs_build_free_nids fs/f2fs/node.c:2287 [inline] f2fs_build_free_nids+0x2a6/0xf30 fs/f2fs/node.c:2328 f2fs_build_node_manager+0x1fb8/0x2c30 fs/f2fs/node.c:3055 f2fs_fill_super fs/f2fs/super.c:3022 [inline] f2fs_fill_super+0x31a3/0x70f0 fs/f2fs/super.c:2803 loop0: rw=12288, want=20488, limit=16368 mount_bdev+0x26f/0x330 fs/super.c:1158 f2fs_mount+0x10/0x20 fs/f2fs/super.c:3234 mount_fs+0x7f/0x2b0 fs/super.c:1261 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2483 [inline] do_mount+0x376/0x2630 fs/namespace.c:2813 attempt to access beyond end of device ksys_mount+0xb1/0xd0 fs/namespace.c:3029 __do_sys_mount fs/namespace.c:3043 [inline] __se_sys_mount fs/namespace.c:3040 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3040 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe loop0: rw=12288, want=20488, limit=16368 RIP: 0033:0x466daa Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007eff001e6fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466daa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007eff001e7000 RBP: 00007eff001e7040 R08: 00007eff001e7040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007eff001e7000 R15: 0000000020012400 Modules linked in: attempt to access beyond end of device attempt to access beyond end of device loop5: rw=12288, want=20488, limit=16368 loop0: rw=12288, want=20488, limit=16368 loop3: rw=12288, want=20528, limit=16368 attempt to access beyond end of device loop2: rw=12288, want=20528, limit=16368 loop0: rw=12288, want=20488, limit=16368 attempt to access beyond end of device attempt to access beyond end of device attempt to access beyond end of device loop0: rw=12288, want=20488, limit=16368 attempt to access beyond end of device attempt to access beyond end of device loop2: rw=12288, want=20536, limit=16368 attempt to access beyond end of device loop2: rw=12288, want=20544, limit=16368 attempt to access beyond end of device loop0: rw=12288, want=20488, limit=16368 loop5: rw=12288, want=20488, limit=16368 ------------[ cut here ]------------ loop3: rw=12288, want=20536, limit=16368 kernel BUG at fs/f2fs/checkpoint.c:127! ------------[ cut here ]------------ ---[ end trace e9718f29e35d186c ]--- kernel BUG at fs/f2fs/checkpoint.c:127! loop2: rw=12288, want=20488, limit=16368 RIP: 0010:f2fs_get_meta_page_nofail+0x41/0x50 fs/f2fs/checkpoint.c:127 ---[ end trace e9718f29e35d186d ]--- invalid opcode: 0000 [#3] PREEMPT SMP KASAN RIP: 0010:f2fs_get_meta_page_nofail+0x41/0x50 fs/f2fs/checkpoint.c:127 CPU: 0 PID: 9293 Comm: syz-executor.0 Tainted: G D 4.19.204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:f2fs_get_meta_page_nofail+0x41/0x50 fs/f2fs/checkpoint.c:127 Code: 00 00 4c 89 ee 4c 89 e7 e8 dc bc ff ff 48 3d 00 f0 ff ff 76 17 48 83 f8 fb 75 05 83 eb 01 75 dd 31 f6 4c 89 e7 e8 cf f2 ff ff <0f> 0b 5b 41 5c 41 5d 5d c3 66 0f 1f 44 00 00 55 31 d2 48 89 e5 e8 RSP: 0018:ffff8881d711f858 EFLAGS: 00010286 RAX: ffff8881e7811640 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffffff00000001 RSI: 0000000000000000 RDI: ffffffff8bad8720 RBP: ffff8881d711f870 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881ecc7d480 R13: 0000000000000a00 R14: ffff8881ecc7d480 R15: ffff8881e73eed80 FS: 00007f4571822700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f23d3d4d000 CR3: 00000001e7b1f001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_current_nat_page+0x12d/0x1b0 fs/f2fs/node.c:116 __f2fs_build_free_nids fs/f2fs/node.c:2287 [inline] f2fs_build_free_nids+0x2a6/0xf30 fs/f2fs/node.c:2328 f2fs_build_node_manager+0x1fb8/0x2c30 fs/f2fs/node.c:3055 f2fs_fill_super fs/f2fs/super.c:3022 [inline] f2fs_fill_super+0x31a3/0x70f0 fs/f2fs/super.c:2803 attempt to access beyond end of device loop3: rw=12288, want=20544, limit=16368 mount_bdev+0x26f/0x330 fs/super.c:1158 f2fs_mount+0x10/0x20 fs/f2fs/super.c:3234 mount_fs+0x7f/0x2b0 fs/super.c:1261 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2483 [inline] do_mount+0x376/0x2630 fs/namespace.c:2813 ksys_mount+0xb1/0xd0 fs/namespace.c:3029 __do_sys_mount fs/namespace.c:3043 [inline] __se_sys_mount fs/namespace.c:3040 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3040 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466daa Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f4571821fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466daa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4571822000 RBP: 00007f4571822040 R08: 00007f4571822040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f4571822000 R15: 0000000020012400 Modules linked in: invalid opcode: 0000 [#4] PREEMPT SMP KASAN CPU: 1 PID: 9313 Comm: syz-executor.5 Tainted: G D 4.19.204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:f2fs_get_meta_page_nofail+0x41/0x50 fs/f2fs/checkpoint.c:127 Code: 00 00 4c 89 ee 4c 89 e7 e8 dc bc ff ff 48 3d 00 f0 ff ff 76 17 48 83 f8 fb 75 05 83 eb 01 75 dd 31 f6 4c 89 e7 e8 cf f2 ff ff <0f> 0b 5b 41 5c 41 5d 5d c3 66 0f 1f 44 00 00 55 31 d2 48 89 e5 e8 Code: 00 00 4c 89 ee 4c 89 e7 e8 dc bc ff ff 48 3d 00 f0 ff ff 76 17 48 83 f8 fb 75 05 83 eb 01 75 dd 31 f6 4c 89 e7 e8 cf f2 ff ff <0f> 0b 5b 41 5c 41 5d 5d c3 66 0f 1f 44 00 00 55 31 d2 48 89 e5 e8 RSP: 0018:ffff8881ce4d7858 EFLAGS: 00010286 RAX: ffff8881ef3c7d40 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffffff00000001 RSI: 0000000000000000 RDI: ffffffff8bad8720 RBP: ffff8881ce4d7870 R08: 0000000000000000 R09: 0000000000000000 RSP: 0018:ffff8881d425f858 EFLAGS: 00010286 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881e8179ac0 R13: 0000000000000a00 R14: ffff8881e8179ac0 R15: ffff8881e6f8b200 FS: 00007fd215741700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeece91a07 CR3: 00000001e7183001 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_current_nat_page+0x12d/0x1b0 fs/f2fs/node.c:116 __f2fs_build_free_nids fs/f2fs/node.c:2287 [inline] f2fs_build_free_nids+0x2a6/0xf30 fs/f2fs/node.c:2328 f2fs_build_node_manager+0x1fb8/0x2c30 fs/f2fs/node.c:3055 RAX: ffff8881e89b8140 RBX: 0000000000000000 RCX: 1ffff1103a2e0d67 f2fs_fill_super fs/f2fs/super.c:3022 [inline] f2fs_fill_super+0x31a3/0x70f0 fs/f2fs/super.c:2803 RDX: ffffffff00000001 RSI: 0000000000000004 RDI: ffffffff8bad8720 mount_bdev+0x26f/0x330 fs/super.c:1158 f2fs_mount+0x10/0x20 fs/f2fs/super.c:3234 mount_fs+0x7f/0x2b0 fs/super.c:1261 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2483 [inline] do_mount+0x376/0x2630 fs/namespace.c:2813 RBP: ffff8881d425f870 R08: 0000000000000000 R09: ffffffff8b5c6978 ksys_mount+0xb1/0xd0 fs/namespace.c:3029 __do_sys_mount fs/namespace.c:3043 [inline] __se_sys_mount fs/namespace.c:3040 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3040 R10: ffff8881d1706bc0 R11: 0000000000000001 R12: ffff8881e85b4400 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466daa Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 R13: 0000000000000a00 R14: ffff8881e85b4400 R15: ffff8881d12d1240 RSP: 002b:00007fd215740fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466daa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fd215741000 RBP: 00007fd215741040 R08: 00007fd215741040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fd215741000 R15: 0000000020012400 Modules linked in: attempt to access beyond end of device FS: 00007eff001e7700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 attempt to access beyond end of device CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Code: 00 00 4c 89 ee 4c 89 e7 e8 dc bc ff ff 48 3d 00 f0 ff ff 76 17 48 83 f8 fb 75 05 83 eb 01 75 dd 31 f6 4c 89 e7 e8 cf f2 ff ff <0f> 0b 5b 41 5c 41 5d 5d c3 66 0f 1f 44 00 00 55 31 d2 48 89 e5 e8 CR2: 00007f8e2c0380a8 CR3: 00000001e82c4002 CR4: 00000000001606f0 loop2: rw=12288, want=20488, limit=16368 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 loop3: rw=12288, want=20488, limit=16368 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 attempt to access beyond end of device