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loop0: detected capacity change from 0 to 512 EXT2-fs (loop0): warning: mounting ext3 filesystem as ext2 ------------[ cut here ]------------ block_group >= groups_count - block_group = 207715, groups_count = 1 WARNING: CPU: 0 PID: 4458 at fs/ext2/balloc.c:53 ext2_get_group_desc fs/ext2/balloc.c:-1 [inline] WARNING: CPU: 0 PID: 4458 at fs/ext2/balloc.c:53 read_block_bitmap+0x1ec/0x754 fs/ext2/balloc.c:138 Modules linked in: CPU: 0 PID: 4458 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : ext2_get_group_desc fs/ext2/balloc.c:-1 [inline] pc : read_block_bitmap+0x1ec/0x754 fs/ext2/balloc.c:138 lr : ext2_get_group_desc fs/ext2/balloc.c:51 [inline] lr : read_block_bitmap+0x1e8/0x754 fs/ext2/balloc.c:138 sp : ffff800020fa73d0 x29: ffff800020fa7400 x28: dfff800000000000 x27: 1fffe0001a59eccf x26: ffff0000e07d07a8 x25: ffff0000d3587800 x24: 0000000000032b63 x23: dfff800000000000 x22: 0000000000000001 x21: ffff0000d2cf6678 x20: ffff0000d2cf6000 x19: 0000000000032b63 x18: ffff800011abbcc0 x17: 1fffe00033ed797e x16: ffff8000082d22d4 x15: 0000000040000000 x14: 0000000000000002 x13: 1ffff00002a180b1 x12: 0000000000ff0100 x11: ff0080000a8935f4 x10: 0000000000000003 x9 : 0b325f2d4251cf00 x8 : 0b325f2d4251cf00 x7 : ffff800008251e10 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000006 x1 : ffff800011abd7c0 x0 : 0000000000000000 Call trace: ext2_get_group_desc fs/ext2/balloc.c:-1 [inline] read_block_bitmap+0x1ec/0x754 fs/ext2/balloc.c:138 ext2_free_blocks+0x28c/0xa3c fs/ext2/balloc.c:523 ext2_free_data fs/ext2/inode.c:1099 [inline] __ext2_truncate_blocks+0x2a8/0xbc0 fs/ext2/inode.c:1190 ext2_truncate_blocks fs/ext2/inode.c:1259 [inline] ext2_write_failed+0x1fc/0x270 fs/ext2/inode.c:65 ext2_direct_IO+0x160/0x1a0 fs/ext2/inode.c:938 generic_file_direct_write+0x31c/0x620 mm/filemap.c:3770 __generic_file_write_iter+0x1bc/0x37c mm/filemap.c:3930 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:4006 ext2_file_write_iter+0xc4/0x404 fs/ext2/file.c:179 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_write+0x120/0x210 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 6860 hardirqs last enabled at (6859): [<ffff800008251ea4>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (6859): [<ffff800008251ea4>] finish_lock_switch+0xb0/0x1c4 kernel/sched/core.c:5003 hardirqs last disabled at (6860): [<ffff800011956c70>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (6846): [<ffff8000081a967c>] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (6846): [<ffff8000081a967c>] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (6811): [<ffff800008020164>] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ block_group >= groups_count - block_group = 2, groups_count = 1 WARNING: CPU: 0 PID: 4458 at fs/ext2/balloc.c:53 ext2_get_group_desc fs/ext2/balloc.c:-1 [inline] WARNING: CPU: 0 PID: 4458 at fs/ext2/balloc.c:53 read_block_bitmap+0x1ec/0x754 fs/ext2/balloc.c:138 Modules linked in: CPU: 0 PID: 4458 Comm: syz.0.17 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : ext2_get_group_desc fs/ext2/balloc.c:-1 [inline] pc : read_block_bitmap+0x1ec/0x754 fs/ext2/balloc.c:138 lr : ext2_get_group_desc fs/ext2/balloc.c:51 [inline] lr : read_block_bitmap+0x1e8/0x754 fs/ext2/balloc.c:138 sp : ffff800020fa73d0 x29: ffff800020fa7400 x28: dfff800000000000 x27: 1fffe0001a59eccf x26: ffff0000e07d07a8 x25: ffff0000d3587800 x24: 0000000000000002 x23: dfff800000000000 x22: 0000000000000001 x21: ffff0000d2cf6678 x20: ffff0000d2cf6000 x19: 0000000000000002 x18: ffff800011abbcc0 x17: 0000000000000000 x16: ffff8000082d22d4 x15: 0000000000000000 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000ff0100 x11: ff00800008191ca8 x10: 0000000000000000 x9 : 0b325f2d4251cf00 x8 : 0b325f2d4251cf00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800020fa6e58 x4 : ffff8000151a4820 x3 : ffff800008311cf4 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: ext2_get_group_desc fs/ext2/balloc.c:-1 [inline] read_block_bitmap+0x1ec/0x754 fs/ext2/balloc.c:138 ext2_free_blocks+0x28c/0xa3c fs/ext2/balloc.c:523 ext2_free_data fs/ext2/inode.c:1108 [inline] __ext2_truncate_blocks+0x378/0xbc0 fs/ext2/inode.c:1190 ext2_truncate_blocks fs/ext2/inode.c:1259 [inline] ext2_write_failed+0x1fc/0x270 fs/ext2/inode.c:65 ext2_direct_IO+0x160/0x1a0 fs/ext2/inode.c:938 generic_file_direct_write+0x31c/0x620 mm/filemap.c:3770 __generic_file_write_iter+0x1bc/0x37c mm/filemap.c:3930 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:4006 ext2_file_write_iter+0xc4/0x404 fs/ext2/file.c:179 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ac/0x7c4 fs/read_write.c:584 ksys_write+0x120/0x210 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 7024 hardirqs last enabled at (7023): [<ffff800008308418>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (7024): [<ffff800011956c70>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (7002): [<ffff8000081a967c>] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (7002): [<ffff8000081a967c>] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624 softirqs last disabled at (6863): [<ffff800008020164>] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]---