EXT4-fs error (device loop0): ext4_fill_super:4450: inode #2: comm syz-executor.0: iget: bad extra_isize 15946 (inode size 512) EXT4-fs (loop0): get root inode failed TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. EXT4-fs (loop0): mount failed INFO: task syz-executor.4:14647 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28592 14647 14388 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 grab_super+0xa2/0x350 fs/super.c:383 sget_userns+0x352/0xcd0 fs/super.c:511 sget+0x102/0x140 fs/super.c:570 mount_bdev+0xf8/0x3b0 fs/super.c:1131 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa77d5a75a9 Code: Bad RIP value. RSP: 002b:00007fa77befa168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa77d6c9050 RCX: 00007fa77d5a75a9 RDX: 0000000020000500 RSI: 00000000200004c0 RDI: 00000000200002c0 RBP: 00007fa77d602580 R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000004010 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe0509d49f R14: 00007fa77befa300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 0000000063ef1141 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7810: #0: 000000007db2961c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by agetty/7827: #0: 0000000088bab930 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000008caf7676 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 1 lock held by syz-executor.4/14144: 2 locks held by syz-executor.4/14647: #0: 0000000056ed064f (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x90/0x3b0 fs/super.c:1125 #1: 000000006366ef16 (&type->s_umount_key#71){++++}, at: grab_super+0xa2/0x350 fs/super.c:383 1 lock held by syz-executor.3/26307: #0: 000000006366ef16 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14144 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 RIP: 0010:__radix_tree_lookup+0x21e/0x370 lib/radix-tree.c:1059 Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 48 01 00 00 48 8b 44 24 28 48 8b 54 24 30 48 89 10 e8 1a 91 73 f9 4c 89 e0 48 83 c4 40 5b <5d> 41 5c 41 5d 41 5e 41 5f c3 e8 03 91 73 f9 4c 39 24 24 77 11 e8 RSP: 0018:ffff88804c5478f0 EFLAGS: 00000286 RAX: 0000000000000000 RBX: 1ffff110098a8f24 RCX: ffffffff87eef3cc RDX: 0000000000000000 RSI: ffffffff87eef456 RDI: 0000000000000007 RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888051c7dcc0 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f93bc9cf700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558e2255f160 CR3: 000000009e68f000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: radix_tree_lookup_slot+0x70/0xc0 lib/radix-tree.c:1079 find_get_entry+0x109/0x8a0 mm/filemap.c:1454 pagecache_get_page+0x56/0xd50 mm/filemap.c:1564 find_get_page_flags include/linux/pagemap.h:278 [inline] __find_get_block_slow fs/buffer.c:206 [inline] __find_get_block+0x591/0xde0 fs/buffer.c:1295 __getblk_slow+0x14a/0x9e0 fs/buffer.c:1040 __getblk_gfp fs/buffer.c:1321 [inline] __bread_gfp+0x218/0x300 fs/buffer.c:1366 sb_bread include/linux/buffer_head.h:309 [inline] vxfs_try_sb_magic+0xa1/0x3e0 fs/freevxfs/vxfs_super.c:163 vxfs_fill_super+0x485/0x8b0 fs/freevxfs/vxfs_super.c:244 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f93be09d5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f93bc9cf168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f93be1bf120 RCX: 00007f93be09d5a9 RDX: 0000000020000500 RSI: 00000000200004c0 RDI: 00000000200002c0 RBP: 00007f93be0f8580 R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000004010 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffb63d7ddf R14: 00007f93bc9cf300 R15: 0000000000022000