====================================================== WARNING: possible circular locking dependency detected 5.14.0-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/7100 is trying to acquire lock: ffff88802741b228 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] ffff88802741b228 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x62c/0xcd0 arch/x86/mm/fault.c:1341 but task is already holding lock: ffff88806dac80e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_iterate+0x129/0xa60 fs/exfat/dir.c:229 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sbi->s_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:596 [inline] __mutex_lock+0x131/0x12f0 kernel/locking/mutex.c:729 exfat_get_block+0x161/0x15c0 fs/exfat/inode.c:305 do_mpage_readpage+0x4b2/0x1a80 fs/mpage.c:231 mpage_readahead+0x2c0/0x6c0 fs/mpage.c:389 read_pages+0x1b0/0x7c0 mm/readahead.c:130 page_cache_ra_unbounded+0x47c/0x7c0 mm/readahead.c:239 page_cache_sync_readahead include/linux/pagemap.h:884 [inline] filemap_get_pages+0x253/0x1380 mm/filemap.c:2545 filemap_read+0x261/0xb90 mm/filemap.c:2628 __kernel_read+0x469/0x9c0 fs/read_write.c:443 integrity_kernel_read+0x68/0x90 security/integrity/iint.c:199 ima_calc_file_hash_tfm+0x253/0x340 security/integrity/ima/ima_crypto.c:484 ima_calc_file_shash security/integrity/ima/ima_crypto.c:515 [inline] ima_calc_file_hash+0x12b/0x3c0 security/integrity/ima/ima_crypto.c:572 ima_collect_measurement+0x3c6/0x4a0 security/integrity/ima/ima_api.c:254 process_measurement+0x8cf/0x1450 security/integrity/ima/ima_main.c:337 ima_file_check+0xac/0x100 security/integrity/ima/ima_main.c:516 do_open fs/namei.c:3428 [inline] path_openat+0x1137/0x2240 fs/namei.c:3559 do_filp_open+0x199/0x3d0 fs/namei.c:3586 do_sys_openat2+0x11e/0x400 fs/open.c:1200 do_sys_open fs/open.c:1216 [inline] __do_sys_openat fs/open.c:1232 [inline] __se_sys_openat fs/open.c:1227 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1227 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (mapping.invalidate_lock#3){.+.+}-{3:3}: down_read+0x9a/0x440 kernel/locking/rwsem.c:1462 filemap_invalidate_lock_shared include/linux/fs.h:841 [inline] filemap_fault+0x98d/0x21a0 mm/filemap.c:3066 __do_fault+0xed/0x390 mm/memory.c:3857 do_read_fault mm/memory.c:4172 [inline] do_fault mm/memory.c:4300 [inline] handle_pte_fault mm/memory.c:4558 [inline] __handle_mm_fault+0x1c84/0x41c0 mm/memory.c:4693 handle_mm_fault+0x166/0x5e0 mm/memory.c:4791 do_user_addr_fault+0x2dc/0xcd0 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] strncpy_from_user+0x120/0x2d0 lib/strncpy_from_user.c:139 getname_flags.part.0+0x89/0x440 fs/namei.c:149 do_sys_openat2+0xd2/0x400 fs/open.c:1194 do_sys_open fs/open.c:1216 [inline] __do_sys_openat fs/open.c:1232 [inline] __se_sys_openat fs/open.c:1227 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1227 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 (&mm->mmap_lock#2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2985/0x5410 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 down_read+0x9a/0x440 kernel/locking/rwsem.c:1462 mmap_read_lock include/linux/mmap_lock.h:117 [inline] do_user_addr_fault+0x62c/0xcd0 arch/x86/mm/fault.c:1341 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 user_access_begin arch/x86/include/asm/uaccess.h:478 [inline] filldir64+0x148/0x750 fs/readdir.c:331 dir_emit_dot include/linux/fs.h:3637 [inline] dir_emit_dots include/linux/fs.h:3648 [inline] exfat_iterate+0x2d7/0xa60 fs/exfat/dir.c:232 iterate_dir+0x1a6/0x6d0 fs/readdir.c:67 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __x64_sys_getdents64+0x124/0x240 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: &mm->mmap_lock#2 --> mapping.invalidate_lock#3 --> &sbi->s_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_lock); lock(mapping.invalidate_lock#3); lock(&sbi->s_lock); lock(&mm->mmap_lock#2); *** DEADLOCK *** 3 locks held by syz-executor.0/7100: #0: ffff8880217daaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:990 #1: ffff88806e08b030 (&sb->s_type->i_mutex_key#20){++++}-{3:3}, at: iterate_dir+0x433/0x6d0 fs/readdir.c:57 #2: ffff88806dac80e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_iterate+0x129/0xa60 fs/exfat/dir.c:229 stack backtrace: CPU: 0 PID: 7100 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:105 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add kernel/locking/lockdep.c:3174 [inline] validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x2985/0x5410 kernel/locking/lockdep.c:5015 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 down_read+0x9a/0x440 kernel/locking/rwsem.c:1462 mmap_read_lock include/linux/mmap_lock.h:117 [inline] do_user_addr_fault+0x62c/0xcd0 arch/x86/mm/fault.c:1341 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0010:filldir64+0x148/0x750 fs/readdir.c:335 Code: 01 ea 48 29 fe 48 63 d2 48 01 f2 0f 82 e9 01 00 00 48 bf 00 f0 ff ff ff 7f 00 00 48 39 fa 0f 87 d6 01 00 00 0f 01 cb 0f ae e8 <4c> 89 76 08 48 8b 3c 24 48 89 38 66 44 89 68 10 44 88 78 12 4c 8d RSP: 0018:ffffc9000986fbf8 EFLAGS: 00050287 RAX: 0000000000000000 RBX: ffffffff8921ebc0 RCX: ffffc9000986fea8 RDX: 0000000000000018 RSI: 0000000000000000 RDI: 00007ffffffff000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffc9000986feb4 R10: ffffc9000986feb8 R11: 0000000000000001 R12: ffffc9000986fe98 R13: 0000000000000018 R14: 0000000000000000 R15: 0000000000000004 dir_emit_dot include/linux/fs.h:3637 [inline] dir_emit_dots include/linux/fs.h:3648 [inline] exfat_iterate+0x2d7/0xa60 fs/exfat/dir.c:232 iterate_dir+0x1a6/0x6d0 fs/readdir.c:67 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __x64_sys_getdents64+0x124/0x240 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2afcc7c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007f2af3bed168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f2afcd9c050 RCX: 00007f2afcc7c169 RDX: 0000000000008008 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f2afccd7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf51d7a5f R14: 00007f2af3bed300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 01 ea add %ebp,%edx 2: 48 29 fe sub %rdi,%rsi 5: 48 63 d2 movslq %edx,%rdx 8: 48 01 f2 add %rsi,%rdx b: 0f 82 e9 01 00 00 jb 0x1fa 11: 48 bf 00 f0 ff ff ff movabs $0x7ffffffff000,%rdi 18: 7f 00 00 1b: 48 39 fa cmp %rdi,%rdx 1e: 0f 87 d6 01 00 00 ja 0x1fa 24: 0f 01 cb stac 27: 0f ae e8 lfence * 2a: 4c 89 76 08 mov %r14,0x8(%rsi) <-- trapping instruction 2e: 48 8b 3c 24 mov (%rsp),%rdi 32: 48 89 38 mov %rdi,(%rax) 35: 66 44 89 68 10 mov %r13w,0x10(%rax) 3a: 44 88 78 12 mov %r15b,0x12(%rax) 3e: 4c rex.WR 3f: 8d .byte 0x8d