Eric Whitney <enwlinux@xxxxxxxxx> 于2021年10月12日周二 上午6:21写道： > > * Hao Sun <sunhao.th@xxxxxxxxx>: > > Hello, > > > > When using Healer to fuzz the latest Linux kernel, the following crash > > was triggered. > > > > HEAD commit: 60a9483534ed Merge tag 'warning-fixes-20211005' > > git tree: upstream > > console output: > > https://drive.google.com/file/d/1zMa_o4PaMiO_nYcQ4giUjNhFszYjFae-/view?usp=sharing > > kernel config: https://drive.google.com/file/d/1u-ncYGLkq3xqdlNQYJz8-G6Fhf3H-moP/view?usp=sharing > > Syzlang reproducer: > > https://drive.google.com/file/d/1LWQjzVVjjI8q6sO1f4AYlq5NlcN-shBP/view?usp=sharing > > > > Sorry, I don't have a C reproducer for this crash, hope the symbolized > > report and Syzlang reproducer can help. > > If you fix this issue, please add the following tag to the commit: > > Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> > > > > ------------[ cut here ]------------ > > kernel BUG at fs/ext4/inode.c:1721! > > invalid opcode: 0000 [#1] PREEMPT SMP > > CPU: 1 PID: 19701 Comm: syz-executor Not tainted 5.15.0-rc4+ #22 > > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > > RIP: 0010:ext4_da_map_blocks fs/ext4/inode.c:1721 [inline] > > RIP: 0010:ext4_da_get_block_prep+0x52a/0x5a0 fs/ext4/inode.c:1830 > > Code: 0f 0b ba 01 00 00 00 e9 d0 fd ff ff e8 7f 42 c0 ff f0 80 4b 01 > > 01 4c 89 ef 31 ed e8 a0 c7 b3 ff e9 f2 fb ff ff e8 66 42 c0 ff <0f> 0b > > e8 5f 42 c0 ff 0f 0b e8 58 42 c0 ff 0f 0b e8 51 42 c0 ff 49 > > RSP: 0018:ffffc9000f8978d0 EFLAGS: 00010246 > > RAX: 0000000000040000 RBX: ffff888121a493f0 RCX: ffffc900011f9000 > > RDX: 0000000000040000 RSI: ffffffff81774f6a RDI: ffffffff853cd076 > > RBP: 27ffffffffffffff R08: 0000000000000001 R09: 0000000000000000 > > R10: ffffc9000f897740 R11: 0000000000000002 R12: ffff88811560b220 > > R13: 00000000000008f3 R14: 0000000000000004 R15: ffffffffffff0000 > > FS: 00007f773e1d6700(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f773e1abdb8 CR3: 000000000a5d7000 CR4: 0000000000750ee0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > PKRU: 55555554 > > Call Trace: > > ext4_block_write_begin+0x208/0x980 fs/ext4/inode.c:1078 > > ext4_da_write_begin+0x1d4/0x490 fs/ext4/inode.c:2969 > > generic_perform_write+0xce/0x220 mm/filemap.c:3770 > > ext4_buffered_write_iter+0xd6/0x190 fs/ext4/file.c:269 > > ext4_file_write_iter+0x80/0x940 fs/ext4/file.c:680 > > call_write_iter include/linux/fs.h:2163 [inline] > > do_iter_readv_writev+0x1e8/0x2b0 fs/read_write.c:729 > > do_iter_write+0xaf/0x250 fs/read_write.c:855 > > vfs_iter_write+0x38/0x60 fs/read_write.c:896 > > iter_file_splice_write+0x2d8/0x450 fs/splice.c:689 > > do_splice_from fs/splice.c:767 [inline] > > direct_splice_actor+0x4a/0x80 fs/splice.c:936 > > splice_direct_to_actor+0x123/0x2d0 fs/splice.c:891 > > do_splice_direct+0xc3/0x110 fs/splice.c:979 > > do_sendfile+0x338/0x740 fs/read_write.c:1249 > > __do_sys_sendfile64 fs/read_write.c:1314 [inline] > > __se_sys_sendfile64 fs/read_write.c:1300 [inline] > > __x64_sys_sendfile64+0xc7/0xe0 fs/read_write.c:1300 > > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > > do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 > > entry_SYSCALL_64_after_hwframe+0x44/0xae > > RIP: 0033:0x46ae99 > > Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 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:00007f773e1d5c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > > RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046ae99 > > RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 > > RBP: 00000000004e4809 R08: 0000000000000000 R09: 0000000000000000 > > R10: 00008400fffffffb R11: 0000000000000246 R12: 000000000078c0a0 > > R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007fffca657850 > > Modules linked in: > > Dumping ftrace buffer: > > (ftrace buffer empty) > > ---[ end trace 46bee01b7f620b60 ]--- > > RIP: 0010:ext4_da_map_blocks fs/ext4/inode.c:1721 [inline] > > RIP: 0010:ext4_da_get_block_prep+0x52a/0x5a0 fs/ext4/inode.c:1830 > > Code: 0f 0b ba 01 00 00 00 e9 d0 fd ff ff e8 7f 42 c0 ff f0 80 4b 01 > > 01 4c 89 ef 31 ed e8 a0 c7 b3 ff e9 f2 fb ff ff e8 66 42 c0 ff <0f> 0b > > e8 5f 42 c0 ff 0f 0b e8 58 42 c0 ff 0f 0b e8 51 42 c0 ff 49 > > RSP: 0018:ffffc9000f8978d0 EFLAGS: 00010246 > > RAX: 0000000000040000 RBX: ffff888121a493f0 RCX: ffffc900011f9000 > > RDX: 0000000000040000 RSI: ffffffff81774f6a RDI: ffffffff853cd076 > > RBP: 27ffffffffffffff R08: 0000000000000001 R09: 0000000000000000 > > R10: ffffc9000f897740 R11: 0000000000000002 R12: ffff88811560b220 > > R13: 00000000000008f3 R14: 0000000000000004 R15: ffffffffffff0000 > > FS: 00007f773e1d6700(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f773e1abdb8 CR3: 000000000a5d7000 CR4: 0000000000750ee0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > PKRU: 55555554 > > Hi: > > Thanks for the report. > > Violation of the assertion enforced on line 1721 in fs/ext4/inode.c has > already been reported separately in a recent upstream kernel. > > It's not clear what can be done with the information reported here. A > reproducer would be most useful but it's not obvious how to generate that > from this information. The supplied log suggests that 1) the test > file system was encountering ENOMEM at least from time to time in ext4_setattr > and that 2) some sort of fault was being injected to force a failure prior to > the crash. > > What sort of fault was being injected? > console output: https://drive.google.com/file/d/1zMa_o4PaMiO_nYcQ4giUjNhFszYjFae-/view?usp=sharing As can be seen in the full console log, the following faults were injected during execution. [ 618.499431][T19702] FAULT_INJECTION: forcing a failure. [ 618.499431][T19702] name failslab, interval 1, probability 0, space 0, times 0 [ 618.502116][T19702] CPU: 1 PID: 19702 Comm: syz-executor Not tainted 5.15.0-rc4+ #22 [ 618.503904][T19702] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 618.506049][T19702] Call Trace: [ 618.506656][T19702] dump_stack_lvl+0x8d/0xcf [ 618.507496][T19702] should_fail+0x13c/0x160 [ 618.508277][T19702] should_failslab+0x5/0x10 [ 618.509259][T19702] slab_pre_alloc_hook.constprop.99+0x4e/0xc0 [ 618.510334][T19702] ? jbd2__journal_start+0xa0/0x350 [ 618.511835][T19702] kmem_cache_alloc+0x44/0x280 [ 618.513404][T19702] jbd2__journal_start+0xa0/0x350 [ 618.514364][T19702] __ext4_journal_start_sb+0x1ea/0x270 [ 618.515499][T19702] ext4_truncate+0x136/0x7e0 [ 618.516881][T19702] ? unmap_mapping_pages+0x95/0x180 [ 618.518105][T19702] ext4_setattr+0x9bf/0xdc0 [ 618.519125][T19702] ? ext4_journalled_write_end+0x7a0/0x7a0 [ 618.520331][T19702] notify_change+0x476/0x670 [ 618.521343][T19702] do_truncate+0xa3/0x100 [ 618.522411][T19702] path_openat+0xc81/0xe20 [ 618.523197][T19702] ? __lock_acquire+0x4a8/0x1d60 [ 618.524155][T19702] ? __lock_acquire+0x4a8/0x1d60 [ 618.525235][T19702] do_filp_open+0xe3/0x170 [ 618.526191][T19702] ? alloc_fd+0x1a1/0x290 [ 618.527059][T19702] ? _find_next_bit+0x10a/0x130 [ 618.528074][T19702] ? do_sys_openat2+0x357/0x4a0 [ 618.529063][T19702] do_sys_openat2+0x357/0x4a0 [ 618.529997][T19702] do_sys_open+0x87/0xd0 [ 618.530860][T19702] do_syscall_64+0x34/0xb0 [ 618.531748][T19702] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 618.532529][T19702] RIP: 0033:0x46ae99 [ 618.533061][T19702] Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 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 [ 618.536000][T19702] RSP: 002b:00007f773e1abc48 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 618.537368][T19702] RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99 [ 618.538530][T19702] RDX: 0000000000000000 RSI: 00000000000000a1 RDI: 00000000200002c0 [ 618.539773][T19702] RBP: 00007f773e1abc80 R08: 0000000000000000 R09: 0000000000000000 [ 618.540912][T19702] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 [ 618.542395][T19702] R13: 0000000000000000 R14: 000000000078c158 R15: 00007fffca657850 [ 618.544389][T19702] EXT4-fs error (device sda) in ext4_setattr:5488: Out of memory > The fact that the test system was running out of memory is a potentially > useful hint. > > Thanks, > Eric > > P.S. The supplied kernel configuration produces a kernel that runs so slowly > that a trial run of the ext4 test appliance has made almost no forward > progress on my test system in three hours of running time on ext4/032 alone > (4K test scenario). So, that's not particularly useful. > Expanding the VM resource, e.g., memory size, may resolve this. Regards Hao
