bisecting fixing commit since 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 building syzkaller on 77e2b66864e69c17416614228723a1ebd3581ddc testing commit 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 with gcc (GCC) 8.4.1 20210217 kernel signature: 0d076655984b6dc4f7672a595ffd206281a99784332ee9cbf22e5a9c4c22a739 run #0: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #1: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #2: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #3: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #4: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #5: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #6: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #7: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #8: crashed: kernel BUG in corrupted run #9: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #10: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #11: crashed: kernel BUG in corrupted run #12: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #13: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #14: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #15: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #16: crashed: kernel BUG in corrupted run #17: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #18: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #19: crashed: kernel BUG in ext4_mb_load_buddy_gfp testing current HEAD 6b7b0056defc6eb5c87bbe4690ccda547b2891aa testing commit 6b7b0056defc6eb5c87bbe4690ccda547b2891aa with gcc (GCC) 8.4.1 20210217 kernel signature: 07e441618b6a393b242d9dbe17150ec8827f4f89a5479122d917d5588862230e run #0: crashed: kernel BUG in corrupted run #1: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #2: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #3: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #4: crashed: kernel BUG in corrupted run #5: crashed: kernel BUG in corrupted run #6: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #7: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #8: crashed: kernel BUG in ext4_mb_load_buddy_gfp run #9: crashed: kernel BUG in corrupted revisions tested: 2, total time: 23m42.449832883s (build: 16m49.467525372s, test: 6m29.365939805s) the crash still happens on HEAD commit msg: Linux 4.19.192 crash: kernel BUG in corrupted wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 EXT4-fs error (device sda1): ext4_map_blocks:613: inode #13864: block 9865: comm syz-executor.4: lblock 0 mapped to illegal pblock 9865 (length 1) Bluetooth: hci3: command 0x0419 tx timeout EXT4-fs error (device sda1) in ext4_reserve_inode_write:5947: Out of memory ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2870! ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2870! wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 invalid opcode: 0000 [#1] PREEMPT SMP KASAN IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready CPU: 0 PID: 9896 Comm: syz-executor.2 Not tainted 4.19.192-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline] RIP: 0010:ext4_mb_load_buddy_gfp+0xfdd/0x1560 fs/ext4/mballoc.c:1116 Code: 0f 87 3c fc ff ff 4c 89 e7 e8 8f b0 a2 ff e9 93 fc ff ff e9 3d fa ff ff e9 9f f7 ff ff 4c 89 e7 e8 d8 28 a8 ff e9 bd fb ff ff <0f> 0b 8b 55 bc 44 89 e6 4c 89 ff e8 53 de ff ff 85 c0 41 89 c5 0f RSP: 0018:ffff888099fffbd8 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: ffff888099fffd50 RCX: 1ffff110147d9868 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a3ecc340 RBP: ffff888099fffc48 R08: 1ffff11012ea1998 R09: ffffed10101c8f20 R10: ffffed10101c8f20 R11: ffff888080e47903 R12: 00000000fffec511 R13: ffff8880a3ecc300 R14: ffff8880a3eca940 R15: ffff8880a3eca2c0 FS: 00000000024c7400(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559e8df652e8 CR3: 0000000097d79000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_discard_preallocations+0x9f1/0xe70 fs/ext4/mballoc.c:4089 ext4_release_file+0x236/0x2b0 fs/ext4/file.c:98 __fput+0x249/0x7f0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x41940b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffe857f2110 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000041940b RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2dd20134 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000056c9e0 R13: 000000000056c9e0 R14: 000000000056bf60 R15: 000000000000cd95 Modules linked in: invalid opcode: 0000 [#2] PREEMPT SMP KASAN Bluetooth: hci4: command 0x0419 tx timeout CPU: 1 PID: 9894 Comm: syz-executor.0 Tainted: G D 4.19.192-syzkaller #0 Bluetooth: hci0: command 0x0419 tx timeout Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline] RIP: 0010:ext4_mb_load_buddy_gfp+0xfdd/0x1560 fs/ext4/mballoc.c:1116 Code: 0f 87 3c fc ff ff 4c 89 e7 e8 8f b0 a2 ff e9 93 fc ff ff e9 3d fa ff ff e9 9f f7 ff ff 4c 89 e7 e8 d8 28 a8 ff e9 bd fb ff ff <0f> 0b 8b 55 bc 44 89 e6 4c 89 ff e8 53 de ff ff 85 c0 41 89 c5 0f RSP: 0018:ffff8880942c7bd8 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: ffff8880942c7d50 RCX: 1ffff110147d9868 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a3ecc340 RBP: ffff8880942c7c48 R08: 1ffff11012f0e988 R09: ffffed10101c9948 R10: ffffed10101c9948 R11: ffff888080e4ca43 R12: 00000000fffec515 R13: ffff8880a3ecc300 R14: ffff8880a3eca940 R15: ffff8880a3eca2c0 FS: 00000000033af400(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f03aa081008 CR3: 0000000097410000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_discard_preallocations+0x9f1/0xe70 fs/ext4/mballoc.c:4089 ext4_release_file+0x236/0x2b0 fs/ext4/file.c:98 __fput+0x249/0x7f0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x41940b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd15e338a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000041940b RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e720134 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000056c9e0 R13: 000000000056c9e0 R14: 000000000056bf60 R15: 000000000000cdac Modules linked in: ieee80211 phy15: Selected rate control algorithm 'minstrel_ht' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 EXT4-fs error (device sda1) in ext4_reserve_inode_write:5947: Out of memory EXT4-fs error (device sda1): ext4_map_blocks:613: inode #13864: block 9865: comm syz-executor.4: lblock 0 mapped to illegal pblock 9865 (length 1) wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 ---[ end trace 70d9eebd511f5021 ]--- IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline] RIP: 0010:ext4_mb_load_buddy_gfp+0xfdd/0x1560 fs/ext4/mballoc.c:1116 ---[ end trace 70d9eebd511f5022 ]--- Code: 0f 87 3c fc ff ff 4c 89 e7 e8 8f b0 a2 ff e9 93 fc ff ff e9 3d fa ff ff e9 9f f7 ff ff 4c 89 e7 e8 d8 28 a8 ff e9 bd fb ff ff <0f> 0b 8b 55 bc 44 89 e6 4c 89 ff e8 53 de ff ff 85 c0 41 89 c5 0f IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready RSP: 0018:ffff888099fffbd8 EFLAGS: 00010282 IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready RAX: dffffc0000000000 RBX: ffff888099fffd50 RCX: 1ffff110147d9868 wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a3ecc340 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline] RIP: 0010:ext4_mb_load_buddy_gfp+0xfdd/0x1560 fs/ext4/mballoc.c:1116 RBP: ffff888099fffc48 R08: 1ffff11012ea1998 R09: ffffed10101c8f20 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready R10: ffffed10101c8f20 R11: ffff888080e47903 R12: 00000000fffec511 Code: 0f 87 3c fc ff ff 4c 89 e7 e8 8f b0 a2 ff e9 93 fc ff ff e9 3d fa ff ff e9 9f f7 ff ff 4c 89 e7 e8 d8 28 a8 ff e9 bd fb ff ff <0f> 0b 8b 55 bc 44 89 e6 4c 89 ff e8 53 de ff ff 85 c0 41 89 c5 0f R13: ffff8880a3ecc300 R14: ffff8880a3eca940 R15: ffff8880a3eca2c0 RSP: 0018:ffff888099fffbd8 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: ffff888099fffd50 RCX: 1ffff110147d9868 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a3ecc340 RBP: ffff888099fffc48 R08: 1ffff11012ea1998 R09: ffffed10101c8f20 R10: ffffed10101c8f20 R11: ffff888080e47903 R12: 00000000fffec511 R13: ffff8880a3ecc300 R14: ffff8880a3eca940 R15: ffff8880a3eca2c0 FS: 00000000033af400(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f03aa08c000 CR3: 0000000097410000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400