====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc4-syzkaller-00261-g850925a8133c #0 Not tainted ------------------------------------------------------ syz.1.78/6170 is trying to acquire lock: ffff8880303a2798 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 but task is already holding lock: ffff888032cacaa0 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] ffff888032cacaa0 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3206 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:815 [inline] process_measurement+0x439/0x1fb0 security/integrity/ima/ima_main.c:250 ima_file_mmap+0x13d/0x2b0 security/integrity/ima/ima_main.c:455 security_mmap_file+0x7e7/0xa40 security/security.c:2979 __do_sys_remap_file_pages mm/mmap.c:1702 [inline] __se_sys_remap_file_pages+0x6e6/0xa50 mm/mmap.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 get_mmap_lock_carefully mm/memory.c:6112 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6163 do_user_addr_fault arch/x86/mm/fault.c:1361 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x111/0x2d0 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x259/0x6d0 mm/filemap.c:4044 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3216 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:683 ksys_write+0x183/0x2b0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#11); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#11); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.1.78/6170: #0: ffff888030aad5f8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160 #1: ffff88802d526420 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #1: ffff88802d526420 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:679 #2: ffff888032cacaa0 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #2: ffff888032cacaa0 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3206 stack backtrace: CPU: 0 UID: 0 PID: 6170 Comm: syz.1.78 Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153 get_mmap_lock_carefully mm/memory.c:6112 [inline] lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6163 do_user_addr_fault arch/x86/mm/fault.c:1361 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:fault_in_readable+0x111/0x2d0 mm/gup.c:2228 Code: 8b 6c 24 18 4c 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 44 7a b6 ff 4c 89 e8 48 25 ff 0f 00 00 74 34 49 bf 00 00 00 00 00 fc ff df <41> 8a 5d 00 e8 46 75 b6 ff 43 0f b6 04 3e 84 c0 0f 85 61 01 00 00 RSP: 0018:ffffc9000b6d7a40 EFLAGS: 00050206 RAX: 0000000000000100 RBX: 0000000020200100 RCX: ffff88805a8a3c00 RDX: ffffc90004e19000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffffc9000b6d7af8 R08: ffffffff81de74bc R09: ffffffff84b20709 R10: 0000000000000002 R11: ffff88805a8a3c00 R12: 00000000000a1000 R13: 000000002015f100 R14: 1ffff920016daf50 R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x259/0x6d0 mm/filemap.c:4044 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3216 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:683 ksys_write+0x183/0x2b0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f30ab57e719 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f30ac2b7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f30ab735f80 RCX: 00007f30ab57e719 RDX: 000000000208e24b RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007f30ab5f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f30ab735f80 R15: 00007fff4dbeedf8 ---------------- Code disassembly (best guess): 0: 8b 6c 24 18 mov 0x18(%rsp),%ebp 4: 4c 89 ee mov %r13,%rsi 7: 48 81 e6 ff 0f 00 00 and $0xfff,%rsi e: 31 ff xor %edi,%edi 10: e8 44 7a b6 ff call 0xffb67a59 15: 4c 89 e8 mov %r13,%rax 18: 48 25 ff 0f 00 00 and $0xfff,%rax 1e: 74 34 je 0x54 20: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 27: fc ff df * 2a: 41 8a 5d 00 mov 0x0(%r13),%bl <-- trapping instruction 2e: e8 46 75 b6 ff call 0xffb67579 33: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax 38: 84 c0 test %al,%al 3a: 0f 85 61 01 00 00 jne 0x1a1