===================================================== BUG: KMSAN: uninit-value in get_branch fs/minix/itree_common.c:54 [inline] BUG: KMSAN: uninit-value in get_block+0xa00/0x1f80 fs/minix/itree_common.c:160 CPU: 0 PID: 16837 Comm: syz-executor.4 Not tainted 5.7.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 get_branch fs/minix/itree_common.c:54 [inline] get_block+0xa00/0x1f80 fs/minix/itree_common.c:160 V1_minix_get_block+0xb5/0xd0 fs/minix/itree_v1.c:56 minix_get_block+0x13e/0x1f0 fs/minix/inode.c:376 __block_write_begin_int+0xb05/0x2ad0 fs/buffer.c:2013 __block_write_begin fs/buffer.c:2063 [inline] block_write_begin+0x16c/0x340 fs/buffer.c:2122 minix_write_begin+0x119/0x3d0 fs/minix/inode.c:412 generic_perform_write+0x3d4/0x9a0 mm/filemap.c:3302 __generic_file_write_iter+0x44e/0xa50 mm/filemap.c:3431 generic_file_write_iter+0x770/0xad0 mm/filemap.c:3463 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0xa5a/0xca0 fs/read_write.c:497 __kernel_write+0x205/0x600 fs/read_write.c:516 do_acct_process+0x1b6a/0x1fb0 kernel/acct.c:522 acct_pin_kill+0x54/0x250 kernel/acct.c:174 pin_kill+0x1c8/0x5d0 fs/fs_pin.c:44 mnt_pin_kill+0x86/0x110 fs/fs_pin.c:81 cleanup_mnt+0x339/0x7c0 fs/namespace.c:1095 __cleanup_mnt+0x3b/0x50 fs/namespace.c:1109 task_work_run+0x1ee/0x2d0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:165 [inline] prepare_exit_to_usermode+0x3c8/0x520 arch/x86/entry/common.c:196 syscall_return_slowpath+0x95/0x5f0 arch/x86/entry/common.c:279 do_syscall_32_irqs_on arch/x86/entry/common.c:342 [inline] do_fast_syscall_32+0x41a/0x6d0 arch/x86/entry/common.c:398 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f0ddd9 Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5d080cc EFLAGS: 00000296 ORIG_RAX: 0000000000000034 RAX: 0000000000000000 RBX: 0000000020000500 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165 add_chain fs/minix/itree_common.c:14 [inline] get_branch fs/minix/itree_common.c:52 [inline] get_block+0xa4d/0x1f80 fs/minix/itree_common.c:160 V1_minix_get_block+0xb5/0xd0 fs/minix/itree_v1.c:56 minix_get_block+0x13e/0x1f0 fs/minix/inode.c:376 __block_write_begin_int+0xb05/0x2ad0 fs/buffer.c:2013 __block_write_begin fs/buffer.c:2063 [inline] block_write_begin+0x16c/0x340 fs/buffer.c:2122 minix_write_begin+0x119/0x3d0 fs/minix/inode.c:412 generic_perform_write+0x3d4/0x9a0 mm/filemap.c:3302 __generic_file_write_iter+0x44e/0xa50 mm/filemap.c:3431 generic_file_write_iter+0x770/0xad0 mm/filemap.c:3463 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0xa5a/0xca0 fs/read_write.c:497 __kernel_write+0x205/0x600 fs/read_write.c:516 do_acct_process+0x1b6a/0x1fb0 kernel/acct.c:522 acct_pin_kill+0x54/0x250 kernel/acct.c:174 pin_kill+0x1c8/0x5d0 fs/fs_pin.c:44 mnt_pin_kill+0x86/0x110 fs/fs_pin.c:81 cleanup_mnt+0x339/0x7c0 fs/namespace.c:1095 __cleanup_mnt+0x3b/0x50 fs/namespace.c:1109 task_work_run+0x1ee/0x2d0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:165 [inline] prepare_exit_to_usermode+0x3c8/0x520 arch/x86/entry/common.c:196 syscall_return_slowpath+0x95/0x5f0 arch/x86/entry/common.c:279 do_syscall_32_irqs_on arch/x86/entry/common.c:342 [inline] do_fast_syscall_32+0x41a/0x6d0 arch/x86/entry/common.c:398 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline] kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:293 __alloc_pages_nodemask+0x56a2/0x5dc0 mm/page_alloc.c:4848 alloc_pages_current+0x67d/0x990 mm/mempolicy.c:2295 alloc_pages include/linux/gfp.h:540 [inline] __page_cache_alloc+0x95/0x310 mm/filemap.c:959 pagecache_get_page+0xab7/0x1250 mm/filemap.c:1645 find_or_create_page include/linux/pagemap.h:308 [inline] grow_dev_page fs/buffer.c:983 [inline] grow_buffers fs/buffer.c:1052 [inline] __getblk_slow fs/buffer.c:1079 [inline] __getblk_gfp+0x4bb/0xfc0 fs/buffer.c:1356 __bread_gfp+0xb9/0x670 fs/buffer.c:1401 sb_bread include/linux/buffer_head.h:309 [inline] get_branch fs/minix/itree_common.c:46 [inline] get_block+0x73e/0x1f80 fs/minix/itree_common.c:160 V1_minix_get_block+0xb5/0xd0 fs/minix/itree_v1.c:56 minix_get_block+0x13e/0x1f0 fs/minix/inode.c:376 __block_write_begin_int+0xb05/0x2ad0 fs/buffer.c:2013 __block_write_begin fs/buffer.c:2063 [inline] block_write_begin+0x16c/0x340 fs/buffer.c:2122 minix_write_begin+0x119/0x3d0 fs/minix/inode.c:412 generic_perform_write+0x3d4/0x9a0 mm/filemap.c:3302 __generic_file_write_iter+0x44e/0xa50 mm/filemap.c:3431 generic_file_write_iter+0x770/0xad0 mm/filemap.c:3463 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0xa5a/0xca0 fs/read_write.c:497 __kernel_write+0x205/0x600 fs/read_write.c:516 do_acct_process+0x1b6a/0x1fb0 kernel/acct.c:522 acct_pin_kill+0x54/0x250 kernel/acct.c:174 pin_kill+0x1c8/0x5d0 fs/fs_pin.c:44 mnt_pin_kill+0x86/0x110 fs/fs_pin.c:81 cleanup_mnt+0x339/0x7c0 fs/namespace.c:1095 __cleanup_mnt+0x3b/0x50 fs/namespace.c:1109 task_work_run+0x1ee/0x2d0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:165 [inline] prepare_exit_to_usermode+0x3c8/0x520 arch/x86/entry/common.c:196 syscall_return_slowpath+0x95/0x5f0 arch/x86/entry/common.c:279 do_syscall_32_irqs_on arch/x86/entry/common.c:342 [inline] do_fast_syscall_32+0x41a/0x6d0 arch/x86/entry/common.c:398 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 =====================================================