bisecting fixing commit since b94de4d19498b454645b72d08a05d32fa9074fb5 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit b94de4d19498b454645b72d08a05d32fa9074fb5 with gcc (GCC) 8.4.1 20210217 kernel signature: 5cb610b209eb7929a3bfebb5ff11e8957554aad226b7987620640078da5fa6c8 all runs: crashed: kernel BUG in f2fs_get_meta_page_nofail testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217 kernel signature: cccbd49ef020cc8c736d39e33f68931680323506aa8d1c4203e91f68939286e5 all runs: crashed: kernel BUG in f2fs_get_meta_page_nofail revisions tested: 2, total time: 22m15.920189843s (build: 15m18.714572041s, test: 6m34.426007061s) the crash still happens on HEAD commit msg: Linux 4.19.183 crash: kernel BUG in f2fs_get_meta_page_nofail attempt to access beyond end of device loop1: rw=12288, want=20488, limit=16368 attempt to access beyond end of device ------------[ cut here ]------------ loop3: rw=12288, want=20496, limit=16368 kernel BUG at fs/f2fs/checkpoint.c:127! invalid opcode: 0000 [#1] PREEMPT SMP KASAN attempt to access beyond end of device CPU: 1 PID: 9274 Comm: syz-executor.1 Not tainted 4.19.183-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:ffff8881cc5f7858 EFLAGS: 00010286 loop3: rw=12288, want=20504, limit=16368 RAX: ffff8881cc436800 RBX: 0000000000000000 RCX: 1ffff1103ccbc147 RDX: ffffffff00000001 RSI: 0000000000000004 RDI: ffffffff8bad7720 RBP: ffff8881cc5f7870 R08: 0000000000000000 R09: ffffffff8b5c48e0 R10: ffff8881e65e0ac0 R11: 0000000000000001 R12: ffff8881e7d85880 R13: 0000000000000a00 R14: ffff8881e7d85880 R15: ffff8881e8364dc0 FS: 00007f31c0870700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056336737230f CR3: 00000001e912f004 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: attempt to access beyond end of device 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:3052 f2fs_fill_super fs/f2fs/super.c:3022 [inline] f2fs_fill_super+0x31a3/0x70f0 fs/f2fs/super.c:2803 loop3: rw=12288, want=20512, 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:2469 [inline] do_mount+0x376/0x2710 fs/namespace.c:2799 attempt to access beyond end of device ksys_mount+0xb1/0xd0 fs/namespace.c:3015 loop3: rw=12288, want=20520, limit=16368 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 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:00007f31c086ffa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466daa attempt to access beyond end of device RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f31c0870000 RBP: 00007f31c0870040 R08: 00007f31c0870040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f31c0870000 R15: 0000000020012400 Modules linked in: ---[ end trace 7d6840f0f0ba0e00 ]--- loop3: rw=12288, want=20528, limit=16368 RIP: 0010:f2fs_get_meta_page_nofail+0x41/0x50 fs/f2fs/checkpoint.c:127 attempt to access beyond end of device 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 loop3: rw=12288, want=20536, limit=16368 RSP: 0018:ffff8881cc5f7858 EFLAGS: 00010286 attempt to access beyond end of device RAX: ffff8881cc436800 RBX: 0000000000000000 RCX: 1ffff1103ccbc147 loop3: rw=12288, want=20544, limit=16368 RDX: ffffffff00000001 RSI: 0000000000000004 RDI: ffffffff8bad7720 attempt to access beyond end of device RBP: ffff8881cc5f7870 R08: 0000000000000000 R09: ffffffff8b5c48e0 loop3: rw=12288, want=20488, limit=16368 R10: ffff8881e65e0ac0 R11: 0000000000000001 R12: ffff8881e7d85880 attempt to access beyond end of device R13: 0000000000000a00 R14: ffff8881e7d85880 R15: ffff8881e8364dc0 loop3: rw=12288, want=20488, limit=16368 FS: 00007f31c0870700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 attempt to access beyond end of device CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 loop3: rw=12288, want=20488, limit=16368 CR2: 000056336737230f CR3: 00000001e912f005 CR4: 00000000001606e0 attempt to access beyond end of device 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